WO2006093006A1

WO2006093006A1 - Method of bending processing for metal material, bending processing apparatus, bending processing equipment line and bending-processed produced obtained thereby

Info

Publication number: WO2006093006A1
Application number: PCT/JP2006/303220
Authority: WO
Inventors: Atsushi Tomizawa; Fumihiko Kikuchi; Shinjiro Kuwayama
Original assignee: Sumitomo Metal Industries, Ltd.; Sumitomo Pipe & Tube Co., Ltd.
Priority date: 2005-03-03
Filing date: 2006-02-23
Publication date: 2006-09-08
Also published as: EP1857195B1; EP2511020A2; EP1857195A1; KR20070102594A; KR100878647B1; EP2511020A3; EP1857195A4; CN101132869B; US20080066517A1; EP1857195B8; CN101132869A

Abstract

A method of push-through bending processing for a metal material, comprising, while sequentially or continuously extruding a material to be processed from the upstream side, carrying out bending processing thereof on the downstream side, wherein the metal material is clamped by means of mobile roller dies and under controlling of the position and/or moving speed of the mobile roller dies, heated at a temperature range permitting local plastic deformation and permitting quench hardening by means of heating means and cooling means disposed on the periphery of the metal material, followed by application of a bending moment and quenching. Further, there are provided a relevant bending processing apparatus and bending processing equipment line. Even in the event of processing to achieve continuous bending involving two-dimensionally different bending directions, or continuous bending involving three-dimensionally different bending directions, of the metal material, and even in the event of requirement of bending processing for a metal material with greater strength, a metal material with high shape fixability and uniform hardness distribution can be obtained efficiently at low cost. Accordingly, wide application thereof can be found as an increasingly sophisticated automobile part bending processing technology.

Description

Specification

Bending method of metal material, bending apparatus and bending equipment line, and products using them

Technical field

The present invention relates to a method for bending a metal material, a bending apparatus and a bending equipment column thereof, and more specifically, in the case of continuous bending (for example, S-shaped bending) in which the bending direction of the metal material is two-dimensionally different. In addition, even in the case of continuous bending in which the bending directions are three-dimensionally different, a metal material bending method capable of efficiently bending, and a processing apparatus and bending equipment row to which the bending method can be applied. Further, it relates to a bent product using them.

Background art

[0002] In recent years, light weight and high strength materials have been required for structural metal materials in consideration of the global environment. For example, in the automobile industry, there is an increasing demand for safety of vehicle bodies, and demands for lighter weight and higher strength of automobile parts are becoming stricter. From the viewpoint of improving fuel efficiency and collision safety, Part development is underway.

[0003] In order to meet such demands, high-strength steel sheets with strength levels that are completely different from conventional ones, for example, high-strength materials with a tensile strength of 780 MPa or more and 900 MPa or more are widely used. And

[0004] On the other hand, along with increasing the strength of these materials, the structure of conventional automotive parts is also reviewed. As a result, in order to apply to a wide variety of automotive parts, a wide range of bending shapes, for example, bending technology that accurately processes metal materials with different bending shape forces in two-dimensional and three-dimensional bending directions. There is a strong demand for development!

[0005] Conventionally, various processing techniques have been proposed in order to respond to such development requests for bending techniques. For example, both Japanese Patent Application Laid-Open Nos. 50-59263 and 2816000 propose a method of bending a metal tube or the like while heat-treating it. Specifically, the processing tip side of a metal tube or the like is clamped to a rotatable arm and heated by a heating device. However, a bending calorie method (a method proposed in Japanese Patent Application Laid-Open No. 50-59263) in which the heating unit is bent and deformed by appropriately moving and then cooled, and further, the torsional force and bending force are applied to the heating unit. And a bending method (a method proposed in Japanese Patent No. 2816000) in which the material is bent and deformed while being torsionally deformed.

[0006] Bending force methods proposed in both of the above-mentioned publications are processing methods classified into so-called gripping bending calories, both of which can freely rotate a processing tip of a metal tube or the like. Since it is necessary to clamp with an arm, the feed rate of the metal pipe to be processed cannot be increased. Moreover, since the arm must be returned each time it is clamped by the arm, the feed rate fluctuates significantly, requiring complex control of the heating and cooling rates, and ensuring the required quenching accuracy. Can not ,.

[0007] Since the above-mentioned problems occur in the grip bending process, Japanese Patent Application Laid-Open No. 2000-158048 is a high-frequency heating bender based on the push-through bending process, and the push-bending roller can be moved in a three-dimensional direction. Has proposed a high-frequency heating vendor to support. According to the high-frequency heating bender disclosed in Japanese Patent Laid-Open No. 2000-158048, the push-bending roller is moved across the object to be bent and moved to the side of the object to be bent in the opposite direction and bent to contact the side surface. Therefore, for example, even in the case of continuous bending in which the bending directions are two-dimensionally different, such as S-shaped bending, it is possible to eliminate the setup work for rotating the workpiece to be bent by 180 degrees.

[0008] However, the high-frequency heating bender disclosed in Japanese Patent Application Laid-Open No. 2000-158048 does not have a means for clamping both sides of the workpiece to be bent, which is caused by residual stress due to cooling after heating by high-frequency. Since deformation is likely to occur, the processing speed is difficult to ensure a predetermined dimensional accuracy, and it is difficult to increase the degree of bending.

[0009] Further, in Japanese Patent No. 3195083, a fixed die and a movable gyroscope that can move in a three-dimensional direction are provided in place of the above-described gripping bending process or a push-bending roller of a high-frequency heating bender. We have proposed a push-through bending apparatus equipped with a heating means for heating a metal member to a temperature corresponding to the curvature of the bending process of the metal member by a gyro die.

[0010] In the bending apparatus disclosed in Japanese Patent No. 3195083, the fixed die and the movable gyro die do not hold the metal member to be processed in a rotatable manner. Therefore, either the fixed die or the movable gyro die can be used. The seizure flaws are likely to occur on the surface. Patent 319 The bending apparatus disclosed in Japanese Patent No. 5083 supplies cooling fluid to the fixed die and the movable gyro die to avoid a decrease in strength of both dies and a decrease in processing accuracy due to thermal expansion. It is impossible to obtain a high strength metal member by quenching, which is not intended for quenching heat treatment.

Disclosure of the invention

[0011] As described above, with the review of the structure of automobile parts, a metal material processing technique having a wide variety of bending shape forces is required to be applied to various automobile parts. On the other hand, considering the weight reduction of metal materials, it is desirable to select a tensile strength of 900 MPa or more, and more desirable to select a 1300 MPa class or more. In such a case, bending is performed using a metal base tube having a tensile strength of about 500 to 700 MPa as a starting material, and then the strength is increased by heat treatment to obtain a high-strength metal material.

[0012] However, in the grip bending process proposed in both Japanese Patent Application Laid-Open Nos. 50-59263 and 2816000, the feed rate of the metal tube varies significantly, making it difficult to control the cooling rate in a complicated manner. Since the quenching accuracy cannot be ensured, it becomes impossible to prevent uneven distortion. For this reason, the bending shape varies, and a high-strength metal material also causes a problem of delayed fracture due to residual stress, making it unsuitable as an automotive part.

[0013] Furthermore, the bending apparatus proposed in Japanese Patent No. 3195083 is based on push-through bending, but after hot working using a low-strength metal blank as a starting material, quenching is performed. It is not intended to increase the strength and obtain a high strength metal material. Further, seizure flaws are likely to occur on the surface of the movable gyro die as the metal member is heated, so that further improvement is required as a hot bending apparatus.

[0014] The present invention has been made in view of the above-described problems, and is a case where a wide variety of bending shapes are required when bending a metal material due to various structures of automotive parts. However, even when higher-strength metal materials need to be bent, the bending accuracy can be ensured, and the metal material bending method with excellent work efficiency can be applied along with the bending method. The purpose is to provide processing equipment and bending equipment lines.

[0015] In order to solve the above-described problem, the bending method of the present invention includes a workpiece held by a supporting means. In a metal material push-bending method in which bending is performed downstream of the support means while sequentially or continuously extruding the work material from the upstream side, the movable roller die provided on the downstream side of the support means While clamping the metal material and controlling the position or / and moving speed of the movable roller die, the heating means and the cooling means disposed on the outer periphery of the metal material on the movable roller die entrance side, The metal material is heated to a temperature range where local plastic deformation can be performed and a temperature range where quenching can be performed, and a bending moment is applied to the heating portion, followed by rapid cooling.

[0016] That is, when the metal material is pushed through and bent, the downstream side of the metal material is clamped and heat-treated while being moved at a constant speed, so that a predetermined cooling rate can be secured, and the bending work is performed. Since the obtained metal material is uniformly cooled, it is possible to obtain a metal material having a good shape freezing property and a uniform hardness even with high strength.

[0017] For example, as a specific configuration, the raw material tube is successively heated by a high-frequency heating coil to a temperature above the A transformation point and at a temperature at which the structure does not become coarse,

Three

The heated local area is plastically deformed using a movable roller die, and immediately after that water or oil-based cooling medium or other cooling liquid, or gas or mist is sprayed on the outer or inner / outer surface force of the tube. Therefore, ensure a cooling rate of 100 ° CZsec or higher.

[0018] In addition, the movable roller die for imparting a bending moment can suppress seizure flaws generated on the surface of the die by the force of clamping the metal material with the movable roller type. It becomes possible. Similarly, since the support means is a method for holding the metal material in a rotatable manner, the occurrence of seizure flaws can be suppressed.

[0019] The bending method according to the second aspect of the present invention is such that the movable roller die has a vertical shift mechanism, a horizontal shift mechanism, a vertical tilt mechanism, and a horizontal tilt mechanism. Has at least one mechanism. As a result, even when the bending shape of the metal material is diverse and the bending direction is two-dimensionally different (for example, S-shaped bending), and even when the bending direction is three-dimensionally different, It can be bent efficiently.

[0020] Further, in the bending method of the third aspect of the present invention, the movable roller die is moved in the front-rear direction. It is possible to have a moving mechanism. By having a forward / backward movement mechanism, the optimal arm length L can be ensured even when the bending radius of the metal material is small, so the size of the processing device can be avoided and bending accuracy can be avoided. Can be secured.

[0021] Further, in the bending method of the fourth aspect of the present invention, the heating means or Z and the cooling means are a vertical shift mechanism, a horizontal shift mechanism, a vertical tilt mechanism, In addition, at least one of tilt mechanisms tilting in the left-right direction can be provided. It is possible to synchronize the operation of the movable roller die with the heating means and the cooling means, and by this synchronization, uniform bending can be performed with higher accuracy.

[0022] Further, in the bending method of the fifth aspect of the present invention, the heating means or Z and the cooling means can have a moving mechanism in the front-rear direction. Since the heating means has a moving mechanism, in addition to synchronism with the movable roller die, it is possible to heat the tip of the metal tube at the start of bending, and workability when attaching and removing the metal tube. The operability will be improved.

[0023] In the bending method of the sixth aspect of the present invention, the movable roller die can further have a rotating mechanism in the circumferential direction. In addition to bending shapes in which the bending direction of the metal material is two-dimensionally different and bending shapes in which the bending direction is three-dimensionally different, torsional deformation can be added.

[0024] In the bending method of the seventh aspect of the present invention, the extrusion device provided on the upstream side of the metal material can have a mechanism for gripping the workpiece and rotating in the circumferential direction. Even if the rotating mechanism of the movable roller die is not used, in addition to the bending shape in which the bending direction of the metal material is two-dimensionally different and the bending shape in which the bending direction is three-dimensionally different, torsional deformation is applied. That's right.

[0025] In the bending method of the eighth aspect of the present invention, the support means further has a rotating mechanism in the circumferential direction, and can rotate in the circumferential direction in synchronization with the rotation of the push-out device. . When twisting deformation of the metal material, the rotating end of the movable roller die is not rotated in the circumferential direction, and the rear end portion of the metal material is twisted by the rotation mechanism of the push-out device while synchronizing the support means. Can be added. Of course, by rotating the movable roller die in the circumferential direction, while synchronizing the support means, By twisting the rear end of the metal material relatively, it is possible to add more accurate torsional deformation.

[0026] In the bending method of the ninth aspect of the present invention, the roll of the movable roller die further has a drive rotation mechanism, and the roller is driven by a drive motor or the like according to the feed amount of the extrusion feed device. Can be driven. In other words, if the movable roller die does not have a drive rotation mechanism, the rotation of the roller is driven only by frictional resistance, compressive stress acts on the bent portion, and the increase in thickness increases on the inner periphery side of the bend. Or buckling may occur. In particular, if the workpiece is a thin-walled material, bending may be difficult due to these, and the processing accuracy may be deteriorated.

[0027] On the other hand, the movable roller die is provided with a drive rotation mechanism so as to relieve the compressive stress acting on the bending portion and to synchronize with this according to the feed amount of the extrusion feed device. In addition, if the roll speed of the movable roller die is controlled, it is possible to apply tensile stress to the bending part, which expands the possible range of bending and improves the accuracy of the product.

[0028] In the bending care method of the tenth aspect of the present invention, the movable roller die can be composed of two rolls, three rolls, or four rolls. Further, in the bending care method of the eleventh aspect, Further, the metal material to be bent can be a closed cross-section material, an open cross-section material, an irregular cross-section material, or a bar material having various cross-sectional shapes. The roll type of the movable roller die can be designed according to the cross-sectional shape of the metal material to be processed.

[0029] In the bending method of the twelfth aspect of the present invention, at least one preheating means is provided on the upstream side of the heating means, and the preheating means performs two-stage heating or uneven heating of the metal material. Can do. When the preheating means is used as multi-stage heating, the heating load of the metal material can be distributed, and the bending efficiency can be improved.

[0030] On the other hand, when the preheating means is used for uneven heating of the metal material, for example, the temperature on the bending inner surface side of the heating portion of the metal material is changed to the bending outer surface side based on the bending direction of the metal material by the movable roller die. The temperature is controlled to be lower. By configuring the heating part of the metal material in this manner, it is possible to prevent the cracks generated on the inner surface side of the bending and the cracks generated on the outer surface side of the bending. [0031] In the bending method of the thirteenth aspect of the present invention, a mandrel is inserted into the inner surface of the metal material as the cooling means, and the cooling medium is supplied together with the cooling means arranged on the outer periphery of the metal material or by the mandrel alone. can do. In particular, it is effective to ensure the cooling rate of thick materials.

[0032] In the bending method of the fourteenth aspect of the present invention, the cooling medium supplied from the cooling means can contain water as a main component and an antifungal agent. If the sliding part gets wet with the cooling water supplied from the cooling device, soot will be generated if the cooling water does not contain an antifungal agent, causing problems from the viewpoint of machine protection. It is effective in terms of machine protection to contain an antifungal agent.

[0033] Further, the cooling medium supplied from the cooling means can contain water as a main component and a quenching agent. For example, a mixture containing an organic polymer agent is known as a quenching agent. By mixing the quenching agent at a predetermined concentration, the cooling rate can be adjusted to ensure stable quenching performance.

[0034] In the bending method of the fifteenth aspect of the present invention, lubricant or Z and a cooling fluid can be supplied to the movable roller die. When the lubricant is supplied to the movable roller die, the occurrence of surface seizure can be reduced by the lubricating action even if the movable roller die entrains the scale generated in the heated portion of the metal material.

[0035] Further, when supplying the cooling fluid to the movable roller die, the movable roller die is cooled by the cooling fluid, so that the strength of the movable roller die is reduced, and the processing accuracy is reduced due to the thermal expansion of the movable roller die. Furthermore, the occurrence of seizure on the surface of the movable roller die can be prevented.

[0036] Further, in the bending care method according to the sixteenth aspect of the present invention, an articulated robot having a joint rotatable about at least one axis is provided, and the movable roller die and the heating means or Z In addition, at least one of a shift mechanism, a tilt mechanism, and a movement mechanism in the cooling means can be performed by the articulated robot.

[0037] By using an articulated robot, the manipulator performs the up / down or left / right shift operation required by the movable roller die, heating means, and cooling means when bending the metal tube. The tilting operation that tilts in the left-right direction or the moving operation in the front-rear direction can be a series of operations based on the control signal, As a result, the processing apparatus can be downsized.

[0038] In order to apply the above-described metal material push-through bending method, in the bending apparatus of the present invention, support means for rotatably holding the workpiece, and the workpiece from the upstream side sequentially or An extrusion device that continuously feeds and moves the metal material, wherein the support is a metal material push-bending device that performs bending on the downstream side of the support means in accordance with the feed movement of the workpiece by the extrusion device. A movable roller die provided on the downstream side of the means for clamping the metal material and controlling the clamping position or / and its moving speed; and an entrance side of the movable roller die and disposed on the outer periphery of the metal material. A heating means for heating the metal material to a temperature range where plastic deformation can be locally performed and a temperature range where quenching can be performed, and the movable roller die is placed on the outer periphery of the metal material. And a cooling means for rapidly cooling the metal material having a bending moment applied to the heating part.

[0039] Further, in the bending equipment column of the present invention, in order to efficiently and inexpensively manufacture a bent calendered product such as a round tube sheet supplied as a workpiece, an anchor for continuously feeding strip steel plates. A welding means for forming a continuous pipe by welding both side edges of the abutted strip-shaped steel sheet, and a welding bead cutting. In addition, a metal material bending apparatus defined in the present invention is continuously arranged on the exit side of the ERW steel pipe production line provided with post-treatment means for post-annealing and sizing as necessary. The

[0040] Further, in the bending processing equipment row of the present invention, the uncrosser that continuously feeds the strip steel plate in order to produce the bent cross-section material supplied as the work material also efficiently and inexpensively. And a metal material bending carriage device defined in the present invention is continuously arranged on the exit side of a roll forming line comprising a forming means for forming the fed strip steel plate into a predetermined cross-sectional shape. As a feature.

[0041] Further, the bent product of the present invention has a tensile strength of 900 by being bent by the metal material bending method or by using the metal material bending apparatus.

It is characterized by being more than Mpa.

[0042] According to the bending method, bending apparatus and bending equipment row of the metal material of the present invention. For example, a wide variety of bending shapes are required, and continuous bending with different bending directions of metal materials (for example, S-shaped bending) and continuous bending with different bending directions in three dimensions are processed. However, even when it is necessary to bend a higher-strength metal material, the metal material is uniformly cooled. A metal material can be obtained efficiently and inexpensively.

[0043] Since the movable roller die clamps the metal material in a rotatable manner, seizure flaws generated on the die surface can be suppressed, bending accuracy can be ensured, and work efficiency can be improved. Excellent push-through bending is possible. As a result, it can be widely applied as a technology for bending automotive parts that are becoming more sophisticated.

Brief Description of Drawings

[0044] FIG. 1 is a diagram showing an overall configuration of a bending apparatus for carrying out the push-through bending process of the present invention.

FIG. 2 is a diagram showing a cross-sectional shape of a workpiece that can be applied as a metal material of the present invention. (A) shows a channel of an open cross-section material manufactured by roll forming or the like, and (b) shows an extrusion. Shown are channels of atypical cross-section manufactured in Kaloe.

FIG. 3 is a diagram showing a configuration example of a support guide that can be employed as the support means of the present invention. (A) shows a cross-sectional configuration of the support guide and the rotation mechanism provided in the support guide. Show the perspective structure in perspective!

FIG. 4 is a diagram for explaining the apparatus configuration of the main part of the bending apparatus of the present invention. FIG. 5 is a diagram showing a schematic configuration example of a heating device and a cooling device employed by the bending apparatus of the present invention.

FIG. 6 is a diagram showing a configuration of a mandrel inserted into the inner surface of a closed cross-section material (metal tube material) in order to ensure the cooling rate of the thick material.

FIG. 7 is a diagram for explaining a configuration example of the vertical and left / right shift mechanisms and the circumferential rotation mechanism of the movable roller die employed by the bending apparatus of the present invention. FIG. 8 is a diagram for explaining the action of the moving mechanism in the front-rear direction of the movable roller die employed by the bending apparatus of the present invention.

FIG. 9 is a diagram showing an example of the shape of the movable roller die employed by the bending apparatus of the present invention. Yes, (a) shows a shape composed of two rolls when the metal material is a closed section material such as a round tube, and (b) shows a closed section material such as a rectangular tube or an open channel such as a channel. (C) shows a shape composed of 4 rolls when the metal material is a closed cross-section material such as a rectangular tube, or an irregular cross-section material such as a channel. ing. FIG. 10 is a diagram for explaining the operation when the preheating device is used for partial heating of a metal material. FIG. 11 is a diagram showing the entire configuration and arrangement of an articulated robot applicable to the bending apparatus of the present invention. .

FIG. 12 is a diagram showing another configuration example of an articulated robot applicable to the bending apparatus of the present invention.

FIG. 13 is a diagram showing the overall configuration of an ERW steel pipe production line used for manufacturing workpieces.

FIG. 14 is a diagram showing an overall configuration of a roll forming line used for manufacturing the reinforced construction material.

BEST MODE FOR CARRYING OUT THE INVENTION

[0045] The embodiment of the present invention includes an overall configuration, a configuration example of a support means, a configuration and heating of a processing unit, a configuration example of a cooling device, a configuration of a movable roller die, a preheating means and its action, an articulated robot. This will be divided into the features of the configuration and the bending machine equipment line, and will be explained based on the drawings.

1. Overall configuration and configuration example of support means

FIG. 1 is a diagram showing the overall configuration of a bending apparatus for carrying out the push-through bending process of the present invention. In the bending process of the present invention, the metal material 1, which is a workpiece that is rotatably held by the support means 2, is bent sequentially on the downstream side of the support means 2 while extruding sequentially or continuously from the upstream side. This is a push-through bending method.

[0047] The cross-sectional shape of the metal material 1 shown in FIG. 1 is a round shape (round tube), but is not limited to this, and workpieces having various cross-sectional shape forces can be applied. For example, in addition to the round shape (round tube) shown in Fig. 1, a closed cross-section material with a rectangular, trapezoidal or complex shape, an open cross-section material (channel) manufactured by roll forming, etc., an irregular cross-section manufactured by extrusion Material Or rods with various cross-sectional shape forces (round bars, square bars, odd-shaped bars), etc. can be applied.

FIG. 2 is a diagram showing a cross-sectional shape of a workpiece applicable as the metal material of the present invention, (a) shows a channel of an open cross-section material manufactured by roll forming or the like, (b) Show the channel of the profile section material produced by extrusion. In the bending apparatus of the present invention, it is necessary to design the shape of the movable roller die and the support means according to the cross-sectional shape of the metal material to be applied.

The apparatus configuration shown in FIG. 1 includes two pairs of support means 2 for holding the metal material 1 rotatably, and an extrusion device 3 for feeding or moving the metal material 1 sequentially or continuously to the upstream side thereof. On the other hand, on the downstream side of the two pairs of support means 2, a metal roller 1 is clamped, and a movable roller die 4 for controlling the clamping position and / or moving speed is arranged. Then, on the entrance side of the movable roller die 4, a high-frequency heating coil 5 that is disposed on the outer periphery of the metal material 1 and locally heats, and the metal material 1 with a bending moment applied to the heating part is cooled rapidly. Device 6 is arranged.

In the apparatus shown in FIG. 1, a metal material having a round cross section (round tube) is applied! /, So a support roll is adopted as the support means 2, but the present invention is not limited to this. However, it is possible to adopt a support guide according to the cross-sectional shape of the metal material to be applied. Further, even when the support roll is adopted, as shown in FIG. 1, it is not limited to the configuration of two pairs of support rolls, but can be configured of one pair or more than two pairs. .

FIG. 3 is a view showing a configuration example of a support guide that can be employed as the support means of the present invention. (A) shows a cross-sectional configuration of the support guide and the rotation mechanism included in the support guide. The external structure of the guide is shown in a perspective view. The support guide 2 shown in FIG. 3 has a configuration in which the rectangular tube 1 is applied as a workpiece and is rotatably held, but is close to the heating means (the high-frequency heating coil 5 shown in FIG. 1). Because it is installed, it has a means to prevent heating. As a means to prevent heating, it is better to manufacture with non-magnetic material, as shown in Fig. 3 (b), and it is divided into two or more parts, and Teflon (registered trademark) etc. It is effective to prevent heating by installing an insulator.

[0052] A rotation that is directly connected to the support guide 2 and includes a drive motor 10 and a rotation gear 10a. A rolling mechanism is provided and, as will be described later, the support guide 2 can rotate in the circumferential direction in synchronization with the rotation of the extrusion device, so that when the metal material 1 is torsionally deformed, accurate deformation is added. Can do.

In the bending apparatus of the present invention, a force that can employ both the support roll shown in FIG. 1 and the support guide shown in FIG. 3 as the support means for the metal material 1. In addition, an embodiment in which a round tube is used as a metal material and a support roll is employed and its operation will be described. However, in the present invention, when the metal material is replaced with a round tube, other closed cross-section material, open cross-section material, atypical cross-section material, or bar material is used, or a support guide is used instead of the support roll. Needless to say, the same effect can be obtained.

[0054] 2. Configuration of processing section and configuration example of heating and cooling device

FIG. 4 is a diagram for explaining the apparatus configuration of the main part of the bending apparatus of the present invention. Two pairs of support rolls 2 holding the metal material 1 and a movable roller die 4 are arranged downstream thereof, and a high-frequency heating coil 5 and a cooling device 6 are arranged on the entrance side of the movable roller die 4. . Further, a preheating device 5a is provided between the two pairs of support rolls 2, and a lubricant supply device 8 is disposed in the immediate vicinity of the movable roller die on the entrance side.

In the apparatus configuration shown in FIG. 4, the metal material 1 that has passed through the two pairs of support rolls 2 is clamped by the movable roller die 4, and the outer periphery of the metal material 1 is controlled while controlling the clamping position or / and the moving speed. Using the high-frequency heating coil 5 and the cooling device 6 arranged in the above, the metal material 1 is locally heated, bent, and then rapidly cooled. During this bending process, the metal material 1 that has passed through the support roll 2 is heated by the high-frequency heating coil 5, so that the yield point of the bending part of the metal material 1 by the movable roller die 4 decreases. Since the deformation resistance decreases, the bending of the metal material 1 becomes easy.

[0056] Further, since the movable roller die 4 is a movable roller type and clamps the metal material 1, seizure flaws generated on the surface of the die can be suppressed even if the metal member 1 is subjected to calorie heat. In addition, since the lubricant is supplied to the movable roller die, even if a scale generated in the heating part of the metal material 1 is involved, the occurrence of seizure flaws can be reduced by the lubricating action on the die surface. it can.

[0057] In the bending apparatus of the present invention, the cooling fluid is supplied to the movable roller die 4. Since the movable roller die 4 is cooled by the cooling fluid, it is possible to prevent the strength of the movable roller die from being lowered, the processing accuracy from being lowered due to the thermal expansion of the movable roller die, and the occurrence of seizure flaws on the surface of the movable roller die. .

FIG. 5 is a diagram showing a schematic configuration example of a heating device and a cooling device employed by the bending apparatus of the present invention. An annular high frequency heating coil 5 is arranged on the outer periphery of the metal material to form the heating part, and the metal material is heated to a temperature at which plastic deformation can be locally performed. Next, after applying a bending moment to the heating portion by the action of the movable roller die, quenching is performed by injecting a cooling medium from the cooling device 6. The metal material before high-frequency heating is held by two pairs of support rolls. In this example, the example in which the heating device and the cooling device are integrated is shown, but of course, the calo heat coil and the cooling device may be provided separately.

[0059] By such a method, the metal material is successively and continuously at the A transformation point or higher and the structure is rough.

Three

It can be heated up to the temperature, and it can be heated to a temperature, and plastic deformation is performed using a movable roller die in the local heating part, and immediately after that, a cooling medium is injected, so that the temperature exceeds 100 ° C / sec. A cooling rate can be secured.

[0060] Therefore, the metal material subjected to the bending process can ensure excellent shape freezing property and stable quality. For example, even when bending using a low-strength metal material as a starting material, increase the strength by uniform quenching to obtain a metal material with a tensile strength of 900 MPa or more and a metal material equivalent to 13 OOMPa class or more. Can do.

[0061] When the metal material becomes thick, it may be difficult to ensure a cooling rate of 100 ° C Zsec or more, but the metal material is a closed cross-section material such as a round tube, a rectangular tube or a trapezoidal tube (metal tube material). ), The mandrel can be inserted into the inner surface of the closed cross-section material as a cooling means.

FIG. 6 is a diagram showing a configuration of a mandrel inserted into the inner surface of a closed cross-section material (metal tube material) in order to ensure the cooling rate of the thick material. When the closed cross-section material becomes thick, it is possible to insert a mandrel 6a on the inner surface as a cooling means and supply a cooling medium in synchronization with the cooling means 6 arranged on the outer periphery of the metal material 1 to ensure a cooling rate. it can. In this case, it is desirable that the mandrel 6a which should be cooled with a fluid or mist on the inner surface of the metal material 1 is made of a non-magnetic material or a refractory material.

[0063] In the bending apparatus of the present invention, the cooling medium supplied from the cooling means 6 is mainly composed of water. Therefore, it is desirable to contain an antifungal agent. If the sliding part of the processing equipment gets wet with the supplied cooling water, if the anti-fouling agent is not contained in the cooling water, wrinkles may occur, which may cause a fatal device defect. It is effective from the viewpoint of machine protection.

[0064] Furthermore, it is desirable that the cooling medium supplied from the cooling means contains water as a main component and a quenching agent. For example, a mixture containing an organic polymer agent is known as a quenching agent. By mixing the quenching agent at a predetermined concentration, the cooling rate can be adjusted to ensure stable quenching performance.

[0065] 3. Configuration of movable roller die

FIG. 7 is a diagram for explaining a configuration example of the vertical and left / right shift mechanisms and the circumferential rotation mechanism of the movable roller die employed by the bending apparatus of the present invention. A metal material (round tube) 1 which is a workpiece is clamped by a movable roller die 4 composed of four rolls. The shift mechanism in the vertical direction is configured by the operation of the drive motor 8, and the shift mechanism in the horizontal direction is configured by the operation of the drive motor 9. Further, the rotation mechanism in the circumferential direction is configured by the operation of the drive motor 10.

[0066] Although FIG. 7 does not show the configuration of a tilt mechanism that tilts the movable roller die 4 in the vertical direction and the horizontal direction, the tilt mechanism employed in the present invention does not require a particularly limited configuration. Any configuration can be used.

FIG. 8 is a diagram for explaining the action of the moving mechanism in the front-rear direction of the movable roller die employed by the bending apparatus of the present invention. As shown in Fig. 8, the bending moment M required for bending work is determined by the following equation (A), where L is the arm length (metal working length).

M = P X L = P XRsin 0 ... (A)

[0068] Accordingly, the force P acting on the pinch roll (movable roll die) 4 decreases as the arm length L increases. In other words, if the bending radius is a machining range from a small diameter to a large diameter, if the movable roller die 4 is not moved in the front-rear direction, the machining force P in machining the metal material 1 with a small bending radius is the equipment. It becomes a restriction. For this reason, if the arm length L is increased in accordance with the processing of the metal material 1 with a small bending radius, a large stroke will occur in the shift mechanism and tilt mechanism of the movable roller die when processing a metal material with a large bending radius. It becomes necessary and the processing equipment becomes larger.

[0069] On the other hand, when considering the stop accuracy of the processing apparatus and the allowable error (operation play), the processing accuracy deteriorates when the arm length L is reduced. For this reason, if the movable roll die 4 is moved in the front-rear direction according to the bending radius of the metal material 1, it becomes possible to select the optimal arm length L and widen the processing range. be able to. In this case, sufficient processing accuracy can be ensured without increasing the size of the processing apparatus.

[0070] Similarly, in the bending apparatus of the present invention, the high-frequency heating device and the cooling device can each have a moving mechanism in the front-rear direction, either alone or in common. In addition to ensuring synchrony with the movable roller die, it is possible to heat the tip of the metal tube at the start of bending, and improve workability and operability when attaching and removing the metal tube. can do.

FIG. 9 is a diagram showing an example of the shape of the movable roller die employed by the bending apparatus of the present invention. (A) is composed of two rolls when the metal material is a closed section material such as a round tube. (B) shows the shape composed of two rolls when the metal material is a closed cross-section material such as a rectangular tube or an open cross-section material such as a channel, and (c) shows the shape of the metal material as a rectangular tube. In the case of a closed cross-section material such as a channel, or an irregular cross-section material such as a channel, the shape is composed of 4 rolls.

[0072] The roll type of the movable roller die 4 can be designed according to the cross-sectional shape of the metal material 1, and as shown in FIG. Can consist of rolls. Normally, the cross-sectional shape of a metal material to be bent can be round, rectangular, trapezoidal or a closed cross-sectional shape with a complicated shape, open cross-sectional shape by roll forming, etc. When the cross-sectional shape of the metal material 1 is substantially rectangular, it is desirable that the movable roller die is composed of four rolls as shown in FIG. 9 (c).

In the processing apparatus of the present invention, in order to add torsional deformation to the metal material, the movable roller die 4 can be provided with a rotating mechanism in the circumferential direction as shown in FIG. At the same time, although not shown in FIG. 1, the extrusion device 3 can be provided with a chuck mechanism 7 that can hold the metal material 1 and rotate it in the circumferential direction, and can have a rotation mechanism.

Therefore, when the torsional deformation is added to the metal material by the processing apparatus of the present invention, the movable opening A method of twisting and deforming the tip of the metal material using a single-radius rotation mechanism and a method of twisting and deforming the rear end of the metal material using the rotation mechanism of the extrusion device can be employed. Normally, adopting a method using a rotation mechanism of an extrusion device results in a compact device structure, whereas a method using a rotation mechanism of a movable roller die makes the device configuration large-scale as shown in FIG. Forces that can become: Either method can give torsional deformation to a metal material.

[0075] In the bending apparatus of the present invention, the support member (support roller or support guide) is further provided with a rotation mechanism in the circumferential direction, whereby the metal material is rotated in the circumferential direction in synchronization with the rotation of the push-out feeding device. Can be made. When torsionally deforming a metal material, either the method of twisting the tip of the metal material using the rotating mechanism of the movable roller die or the method of twisting and deforming the rear end of the metal material using the rotation mechanism of the extrusion device Even if is adopted, accurate torsional deformation can be added to the metal material by synchronizing the support means.

[0076] In the bending apparatus of the present invention, the movable roller die is provided with a roll drive rotation mechanism, so that the roller is driven to rotate by a drive motor or the like according to the feed amount of the extrusion feed device. Can be given. In other words, while reducing the compressive stress acting on the bending part and controlling the roll rotation speed of the movable roller die so as to synchronize with the feed amount of the extrusion feeder, tensile stress is applied to the bending part. It can also be added, which expands the possible range of bending and improves the processing accuracy of the product.

[0077] 4. Preheating means and its action

In the bending apparatus according to the present invention, a preheating device is provided on the upstream side of the heating device, and the preheating device can perform two-stage heating of the metal material or more than one stage, or uneven heating. When the preheating means is used as multi-stage heating, the heating load of the metal material can be dispersed and the bending efficiency can be improved.

FIG. 10 is a diagram for explaining the operation when the preheating device is used for uneven heating of a metal material. When the preheating high-frequency heating coil 5a is used as a preheating device for uneven heating of the metal material 1, the metal material 1 is biased into the preheating high-frequency heating coil 5a based on the bending direction of the metal material by the movable roller die. Bending in the heating part of the metal material 1 by positioning Control is performed so that the temperature on the inner surface side is lower than the temperature on the outer surface side of the bending.

[0079] Specifically, in Fig. 10, the A side of the metal material 1 is positioned so as to approach the preheating high-frequency heating coil 5a, and the outer surface temperature on the B side corresponding to the inner surface side of the bending is determined. The A side outer surface temperature corresponding to is controlled to be higher. By configuring the heating part of the metal material 1 in this manner, it is possible to effectively prevent the cracks occurring on the inner surface side of the bending and the cracks occurring on the outer surface side of the bending.

[0080] In the bending apparatus of the present invention, a lubricant can be supplied to the movable roller die.

Thereby, even when the movable roller die entrains the scale generated in the heating portion of the metal material, the occurrence of surface seizure can be reduced by the lubricating action.

Similarly, in the bending apparatus of the present invention, a cooling fluid can be supplied to the movable roller die. Since a cooling pipe is provided inside the movable roller die and in the vicinity of the portion for clamping the metal material, and the cooling fluid is supplied to the movable roller die, the movable roller die is cooled by the cooling fluid. It can prevent the strength of the die from being lowered, the processing accuracy from being lowered due to the thermal expansion of the movable roller die, and the seizure of the surface of the movable roller die.

[0081] 5. Configuration and layout of articulated robot

FIG. 11 is a diagram showing the overall configuration and arrangement of an articulated robot applicable to the bending apparatus of the present invention. As shown in FIG. 11, an articulated robot 11 for the movable roller die 4 can be arranged on the downstream side of the bending carriage device.

The structure of the articulated robot 11 for the movable roller die consists of a fixed surface 12 fixed to the work surface, three arms 13, 14, 15 and each arm 13, 14, 15 connected to each other. It has three joints 16, 17, 18 that can be rotated around. A movable roller die 4 is attached to the arm 15 at the tip of the articulated robot 11.

FIG. 12 is a diagram showing another configuration example of the articulated robot that can be applied to the bending carriage apparatus of the present invention. In the bending apparatus shown in FIG. 11, the joint type robot 11 for the heating device and the cooling device can be provided at the same time as the force for arranging only the joint type robot for the movable roller die. By installing an articulated robot, the bending efficiency can be further improved. [0083] In the bending apparatus of the present invention, by providing at least one articulated robot having three joints that can rotate around an axis, a shift mechanism with a movable roller die 4 is used when bending a metal material. In addition, operations such as bending, stretching, turning, and translation performed by the tilt mechanism and moving mechanism, that is, operations performed by a total of six types of manipulators can be made into a series of operations based on control signals. As a result, the bending apparatus can be made more efficient and the processing apparatus can be downsized.

[0084] 6. Bending equipment line

As described above, a closed cross-section material having a shape such as a round shape or an open cross-section material is used as a work material provided to the bending apparatus of the present invention. Conventionally, ERW steel pipes have been widely used as closed cross-section materials for round pipes, and roll-formed steel materials are often used as open cross-section materials.

FIG. 13 is a diagram showing an overall configuration of an ERW steel pipe production line used for production of a workpiece. The ERW steel pipe production line 19 is an apparatus for producing a steel pipe from the strip steel plate 20. As an apparatus configuration for that purpose, an uncoiler 21 that continuously feeds the strip steel plate 20 from the strip steel plate roll, and a forming means 22 including a plurality of roll forming machines that form the fed strip steel plate 20 into a pipe having a predetermined cross-sectional shape. Welding means 23 comprising a welding machine that welds both side edges of the strip-shaped steel plates that are tubular and abutted to each other to form a continuous tube, a weld bead cutting device and a post-aligner device, and further continuous A post-processing means 24 for reducing the pipe to a required size and a cutting means 25 provided with a traveling cutting machine for cutting the pipe of the required size into a required length are continuously provided.

[0086] FIG. 14 is a diagram showing an overall configuration of a roll forming line used for manufacturing the reinforced construction material. The roll forming line 26 is an apparatus for forming the strip steel plate 20 into a predetermined shape. Therefore, a strip steel plate 20 as a metal material is wound, an uncoiler 21 that feeds out the strip steel plate 20, and a roll forming machine that forms the strip steel plate 20 fed out by the uncoiler 21 into a predetermined shape. A means 27 and a cutting means 28 provided with a traveling cutting machine for continuously cutting the strip-shaped steel plate 20 formed into a predetermined shape by the roll forming machine into a predetermined length dimension.

[0087] According to the ERW pipe manufacturing line 19 shown in FIG. 13 and the roll forming line 26 shown in FIG. The processed material is supplied to the bending machine as a metal material for processing. However, if each line and the apparatus are separated and independent, due to the difference in processing speed between the line and the apparatus, It is necessary to secure a place to stock work materials. In addition, it is necessary to transport workpieces between each line and equipment, and auxiliary transport facilities and means such as cranes and trucks must be provided.

[0088] In the bending apparatus of the present invention, it is continuously arranged on the exit side of the ERW steel pipe production line 19 or the roll forming line 26, so that the entire process from supplying the workpiece to the bending apparatus is performed. The equipment line can be made compact, and by setting the operating conditions appropriately, it is possible to manufacture bent products with excellent precision efficiently and inexpensively.

Industrial applicability

[0089] According to the bending method, bending apparatus, and bending equipment line of the metal material of the present invention, a wide variety of bending shapes are required, and the bending direction of the metal material is two-dimensionally different (for example, (S-shaped bending) and continuous bending with three-dimensional bending directions are different, and even when higher-strength metal bending is required, the metal material is cooled uniformly. Therefore, a metal material having good shape freezing property and uniform hardness distribution even at high strength can be obtained efficiently and inexpensively.

Since the movable roller die clamps the metal material in a rotatable manner, seizure flaws generated on the surface of the die can be suppressed, so that bending accuracy can be ensured and work efficiency is excellent. Push-through bending is possible. As a result, it can be widely applied as a technology for bending automotive parts that are becoming more sophisticated.

Claims

The scope of the claims

[1] In a push-through bending method for a metal material in which bending is performed on the downstream side of the support means while sequentially or continuously extruding the workpiece held by the support means from the upstream side, on the downstream side of the support means Clamping the metal material with a movable roller die provided in the heating means, and controlling the position or / and the moving speed of the movable roller die, and heating means disposed on the outer side of the metal material on the entrance side of the movable roller die And the cooling means is used to heat the metal material to a temperature range where local plastic deformation can be performed and to a temperature range where quenching can be performed, and after applying a bending moment to the heating portion, the metal material is rapidly cooled. A bending method for metal materials.

[2] The movable roller die has at least one of a vertical shift mechanism, a horizontal shift mechanism, a vertical tilt mechanism, and a horizontal tilt mechanism. The metal material bending method according to claim 1, wherein the metal material is bent.

3. The metal material bending method according to claim 2, wherein the movable roller die has a moving mechanism in the front-rear direction.

[4] The heating means or Z and the cooling means are at least one mechanism selected from a vertical shift mechanism, a horizontal shift mechanism, a vertical tilt mechanism, and a horizontal tilt mechanism. The metal material bending method according to claim 2, wherein the metal material is bent.

[5] Furthermore, the heating means or Z and the cooling means have a moving mechanism in the front-rear direction.

5. The metal material bending method according to claim 4, wherein the metal material is bent.

6. The movable roller die has a circumferential rotation mechanism.

The bending method for a metal material according to any one of 1 to 5.

[7] The extrusion apparatus according to any one of claims 1 to 6, wherein the extrusion device provided on the upstream side of the metal material has a mechanism for gripping the workpiece and rotating in a circumferential direction. A method of bending a metal material according to any one of the above.

[8] The support means has a circumferential rotation mechanism, and the extrusion feed device rotates. 8. The method for bending a metal material according to claim 7, wherein the metal material is rotated in the circumferential direction in synchronism with.

[9] The movable roller die according to any one of claims 1 to 8, wherein the movable roller die has a roll drive mechanism, and applies a drive rotation to the roll in accordance with a feed amount of the extrusion device. Bending method of metal material.

[10] The metal material bending method according to any one of [1] to [9], wherein the movable roller die is composed of two rolls, three rolls, or four rolls.

[11] The metal according to any one of claims 1 to 10, wherein the metal material to be bent is a closed cross-section material having various cross-sectional shape forces, an open cross-section material, a modified cross-section material, or a bar material. The bending method of the material.

[12] The metal material according to any one of [1] to [11], wherein at least one or more preheating means is provided upstream of the heating means, and the metal material is subjected to multi-stage heating or partial heating. Bending method.

13. The method for bending a metal material according to any one of claims 1 to 12, wherein a mandrel is inserted into the inner surface of the metal material as a cooling means, and a cooling medium is supplied.

[14] The cooling means power according to any one of claims 1 to 13, wherein the cooling medium to be supplied contains water as a main component and contains an antifungal agent and / or a quenching agent. Bending method of metal material.

15. The method for bending a metal material according to claim 1, wherein a lubricant or Z and a cooling fluid are supplied to the movable roller die.

[16] An articulated robot having at least one or more pivotable joints is provided, and at least one of the movable roller die and the shift mechanism, tilt mechanism, and moving mechanism in the heating means or the Z and cooling means. The metal material bending method according to any one of claims 1 to 15, wherein one or more operations are performed by the articulated robot.

[17] A support means for holding the workpiece, and an extrusion device that sequentially or continuously feeds and moves the workpiece to an upstream force, in accordance with the feed movement of the workpiece by the extrusion device, In a metal material push-bending device that performs bending on the downstream side of the support means, A movable roller die provided on the downstream side of the support means to clamp the metal material and to control the clamping position or / and the moving speed thereof;

Heating means disposed on the outer periphery of the metal material on the entrance side of the movable roller die and heating the metal material to a temperature range in which plastic deformation can be locally performed and quenching can be performed;

Bending of the metal material, comprising cooling means for rapidly cooling the metal material which is disposed on the outer periphery of the metal material and is provided on the outer periphery of the metal material and which is given a bending moment to the heating portion. apparatus.

[18] The movable roller die includes at least one mechanism among a vertical shift mechanism, a horizontal shift mechanism, a vertical tilt mechanism, and a horizontal tilt mechanism. 18. The metal material bending apparatus according to claim 17, wherein the apparatus is a metal material bending apparatus.

19. The metal material bending apparatus according to claim 17, wherein the movable roller die further includes a moving mechanism in the front-rear direction.

[20] The heating means or Z and the cooling means are at least one mechanism selected from a vertical shift mechanism, a horizontal shift mechanism, a vertical tilt mechanism, and a horizontal tilt mechanism. 18. The metal material bending apparatus according to claim 17, further comprising:

21. The metal material bending apparatus according to claim 20, wherein the heating means or Z and the cooling means further include a moving mechanism in the front-rear direction.

22. The movable roller die comprises a circumferential rotation mechanism.

7. The metal material bending apparatus according to any one of 7 to 21.

[23] The metal material bending / care apparatus according to any one of [17] to [22], wherein the extrusion device includes a mechanism for gripping a workpiece and rotating in a circumferential direction.

24. The apparatus for bending a metal material according to claim 23, wherein the support means includes a circumferential rotation mechanism that synchronizes with the rotation of the push-out device.

25. The movable roller die according to any one of claims 17 to 24, wherein the movable roller die includes a drive mechanism that applies drive rotation to the roll in accordance with a feed amount of the extrusion feed device. Metal material bending machine.

[26] The metal material bending carriage apparatus according to any one of [17] to [25], wherein the movable roller die is composed of two rolls, three rolls, or four rolls.

[27] The metal according to any one of [17] to [26], wherein the metal material to be bent is a closed cross-section material having various cross-sectional shape forces, an open cross-section material, a modified cross-section material, or a bar material Material bending equipment.

[28] The metal material bending apparatus according to any one of [17] to [27], further comprising preheating means for performing multi-stage heating or partial heating of the metal material upstream of the heating means. Place.

29. The metal material bending carriage apparatus according to any one of claims 17 to 28, wherein a mandrel is disposed on the inner surface of the metal material as a cooling means, and a cooling medium is supplied.

[30] The cooling medium power according to any one of claims 17 to 29, wherein the cooling medium to be supplied contains water as a main component and contains an antifungal agent and / or a quenching agent. Metal bending equipment.

31. The metal material bending and chasing apparatus according to claim 17, further comprising means for supplying a lubricant or Z and a cooling fluid to the movable roller die.

[32] The movable roller die and at least one joint capable of rotating around at least one axis among the shift mechanism, the tilt mechanism, and the movement mechanism in the heating means or the Z and cooling means. 32. The metal material bending / care apparatus according to any one of claims 17 to 31, wherein the articulated robot is provided.

[33] An uncoiler that continuously feeds the strip steel plate, forming means for forming the fed strip steel plate into a pipe having a predetermined cross-sectional shape, and welding the both side edges of the abutted strip steel plate to form a continuous pipe The bending of the metal material according to any one of claims 17 to 32, on the exit side of an ERW steel pipe production line comprising welding means and post-treatment means for performing welding annealing and post-annealing and sizing as necessary. Bending equipment line characterized by continuous arrangement of processing equipment.

[34] On the exit side of the roll forming line, comprising an uncoiler that continuously feeds the strip-shaped steel sheet, and a forming means for forming the fed strip-shaped steel sheet into a predetermined cross-sectional shape. A bending equipment row, wherein the metal material bending cage apparatus according to any one of to 32 is continuously arranged.

[35] A bending process characterized by having a tensile strength of 900 Mpa or more, which has been subjected to a kale heat treatment by the method of bending a metal material according to any one of claims 1 to 16. Product.

[36] The bending process according to any one of claims 17 to 34, wherein the tensile strength is 900 Mpa or more, which is heat-heated using the metal bending bending apparatus according to any one of claims 17 to 34. Product.