EP1090696B2 - Chain traction device for continuous drawing - Google Patents

Abstract

The machine has two or more driven drawing chains (3,4) with drawing members (5A,B) having clamp jaws for the drawn material on one side, and a slide surface on the other side. The slide surfaces support themselves on rigid roller guides (9) on each chain, via drive rollers (8). The drive rollers are interactively supported on the slide surfaces (13) and/or the roller guide via a divided contact surface, and on the level of the surface division, only via guides (31) moving with the rollers. The rollers are combined to form a chain.

Description

The invention relates to a chain drawing machine for the continuous drawing of particular rod and tubular drawn material according to the preamble of claim 1, in particular a chain drawing machine with at least two, a common pull track assigned drive chains, each having interconnected tension members and the laterally provided by the tension members means drivable are, wherein the tension members are provided on one side with a pressable to the pulling material clamping jaw and on another side with a sliding surface with which the tension members are supported by rotating, load-bearing idler rollers on a rigid roller guide associated with each drive chain.

In the continuous pulling of metal to be drawn with chain drawers to be pulled by a drawing tool to be pulled on a drawing path between jaws, wherein the jaws are moved by means of endless rotating, driven by sprockets drive chains in the pulling direction. For friction-friction-free support of the contact forces, the drive chains run on a variety of load-bearing idler rollers, which in turn run endlessly around fixed paths or rigid roller guides. In order to clamp the drawn material, at least two drive chains with clamping jaws are provided along the pull section, which are each supported by means associated with them machine-side roller guides and casters. In two drive chains, the roller guides are parallel and on both sides of the drawing line. In some drawing machines but also several drive chains are present, which then either symmetrically or asymmetrically press their jaws to the stock.

The EP 0 548 723 B2 shows a generic chain drawing machine. The tension members of the drive chains have on their back, ie the side facing away from the jaws on a sliding surface, which runs like a rolling bearing on a mitbewegte, guided on a fixed, rigid roller guide chain of idler rollers. The clamping force is transmitted by means of the idler rollers directly from the jaws on the sliding surfaces on the roller guide. In order to achieve an overall rigid construction of the machine and to counteract the tendency of the idler rollers to transverse position when unevenly loaded, the idler rollers are centered, with all the sliding surfaces of the tension members arranged in series a single, the rigid roller guide opposite and the same width as the idler rollers and the roller guide width extending sliding surface. Due to the central arrangement of the contact surface between the idler rollers and the sliding surface of the tension members or the machine-side roller guide an accurate force application or force distribution is achieved in the machine frame and the wear of the idler rollers can be minimized. The individual tension members are connected to each other via bolts and have a complicated arrangement of other follower rollers and locking plates whose geometrical dimensions are coordinated.

The object of the invention is to provide an improved chain drawing machine, which is simple and allows high clamping forces.

This object is achieved by the invention specified in claims 1 and 3.

According to the invention, it is provided that the idler rollers interact with the sliding surface and / or the roller guide via a shared contact surface and are guided at the height of the contact surface division only by guides which follow the rollers. In this way, a complex guide device on the sliding surface and / or the roller guide need not be provided, which significantly reduces the cost of the frame. Likewise, a maintenance of the machine is easier because a fixed guide or with the trailing members follower guide is very difficult to access.

It can be provided that the roller guides for the drive chains are divided by means of at least one relief recess in guideways in a first alternative. The relief recess may extend substantially along the pull section. Since the roller guides, on which the idler rollers roll, are subject to tolerances and in particular are never completely flat, the idler rollers can adapt better to the roller guide due to the relief recess, so that the effective load-bearing force line increases.

Preferably, in a second alternative cumulative or alternatively to the first alternative to achieve the same advantages, the sliding surface of the tension members is divided by means of at least one relief recess in slideways. Particularly preferred is when the idler rollers themselves are designed so that they are slightly articulated, based on the total width of all guideways and slideways, so that they can adapt to existing tolerances in the guideways and slideways.

In a first embodiment, it is provided that the follower rollers extend over at least two guideways, preferably so that in each case a follower roller extends over all guideways. In order to increase the adaptability of the idler roller to existing tolerances, the idler rollers particularly advantageously have a circumferential taper assigned to each relief recess. Thus, depending on the position of the relief recesses, the follower rollers experience deliberate weakening or minimizing of their diameter, so that over the width of the idler rollers a resilient adaptation or elastic bending to compensate for the tolerances within the guideways and sliding surfaces can take place.

In an alternative embodiment, the idler rollers consist of parallel guided roller sets, wherein each guideway and / or slideway is associated with a roller set. The mechanical effort for the leadership of the idler rollers or roller sets is reduced when the roller sets are then connected to each other via roller cages, especially when the roller sets are designed as chains.

In order to achieve uniform force distributions, the guideways and slideways should be uniform and / or opposite each other with the same width. Furthermore, it is advantageous if at least one relief recess divides the roller guide and / or the sliding surface in the middle. In a particularly preferred embodiment, two guideways and / or two slideways are provided.

In addition, the tension members may be connected by means of a connecting bolt, on both sides of the tension members on the connecting pin rollers and / or pull pieces are arranged. A uniform application of force and force distribution is favored when the jaws and the sliding surfaces are arranged on opposite, mutually parallel sides of the tension members, wherein the clamping jaws and the sliding surfaces or slideways can be integrally integrated into the tension members.

In a second implementation of the present invention, the follower rollers are formed at least from two sub-rollers, which are mounted on a common axis. This arrangement is particularly inexpensive, since it can be realized with standard components and still shows the same advantages as the arrangements described above. Here, a spacer, for example a sleeve arranged on the axis, is provided between the partial rollers.

In particular, in this embodiment, it is advantageous if the follower rollers are connected together to form a chain. Since the tabs of the chain partially overlap, a bending of the chain in the lateral direction is limited. This results in a simple way an external guide of the idler rollers or sub-rollers. This outer guide can absorb laterally acting executives.

It is particularly advantageous that inner guide elements can receive laterally acting guiding forces, wherein they run along with the rollers and are arranged at the level of the contact surface division and thereby do not come into effective contact with fixed guide elements in the lateral direction. The fact that the inner guide elements can independently absorb management forces, can be dispensed with internal components, which would have to be executed in the form of fixed guide elements. By eliminating such fixed guide elements u.a. also space available, which in turn is available for a more compact design.

The laterally acting guiding forces are understood to be forces which have a force component which acts on an orthogonal plane which is imaginary in the longitudinal direction of the guiding surface.

Furthermore, it is advantageous that by saving fixed guide elements, reductions in costs in the area of construction, production and later also maintenance arise.

The inner guide elements are advantageously arranged parallel to the sliding surface and between the sliding surface and the guide surface.

Also in the embodiment in which, for example, the idler rollers consist of parallel guided roller sets, these inner guide elements are also arranged. As a result, can be dispensed with fixed side components for guiding the idler rollers.

Fig. 1

schematisch eine erfindungsgemäße Triebkettenführung einer Kettenziehmaschine nach einer ersten, bevorzugten Ausführungsform;

Fig. 2

schematisch den oberen Teil einer erfindungsgemäßen Triebkettenführung einer Kettenziehmaschine nach einer alternativen Ausführungsform;

Fig. 3

schematisch eine erfindungsgemäße Triebkettenführung einer Kettenziehmaschine nach einer weiteren alternativen Ausführungsform in ähnlicher Darstellung wie Fig. 2;

Fig. 4

schematisch eine erfindungsgemäße Triebkettenführung nach einer weiteren alternativen Ausführungsrform; und

Fig. 5

einen Längsschnitt durch eine Kettenziehmaschine, der das Funktionsprinzip einer Kettenziehmaschine verdeutlicht.

Further advantages and embodiments of the invention will become apparent from the following description of schematic diagrams of alternative embodiments of the invention. In the drawing show:

Fig. 1

schematically an engine chain guide according to the invention a chain drawing machine according to a first preferred embodiment;

Fig. 2

schematically shows the upper part of a drive chain guide according to the invention a chain drawing machine according to an alternative embodiment;

Fig. 3

schematically a drive chain guide according to the invention a chain drawing machine according to a further alternative embodiment in a similar representation as Fig. 2 ;

Fig. 4

schematically an engine chain guide according to the invention according to another alternative Ausführungsrform; and

Fig. 5

a longitudinal section through a chain drawing machine, which illustrates the principle of operation of a chain drawing machine.

Fig. 1 shows in principle the drive chain guide a chain drawing machine, not shown substantially. The designated 1 drawn material is clamped between the jaws 2 an endlessly rotating upper drive chain 3 and an endlessly circulating lower drive chain 4. The drive chains 3,4 each consist of a plurality of identical to each other trained tension members 5A, 5B, which are interconnected by means of a connecting pin 6, wherein the jaws 2 on the outer side 5 'of the tension members 5A, 5B, based on the orbit of the drive chains 3.4 , are arranged. By nuts 7, the connection of the tension members 5A, 5B is secured.

For driving the drive chains 3,4, the chain drawing machine spaced from each other, here sprockets, not shown, whose teeth interact, for example, with the connecting pin 6 directly or via pull pieces 5A. Preferably, for each drive chain 3,4 two spaced sprockets are provided, between which the drive chains 3,4 through and circulate. In this way, a drive is ensured laterally of the tension members.

The drive chains 3, 4 are supported along a drawing path, on which the clamping jaws 2 are pressed against the drawn material 1, via follower rollers 8 on a rigid guide surface designated overall by 9 and arranged on the machine frame 10. The guide surface 9 has centrally a relief recess 11 which divides the guide surface 9 into a first guide track 9A and a second guide track 9B. For the rolling contact of the idler rollers 8 with the tension members 5A, 5B, these at the jaws 2, i. on the outer side 5 'parallel opposite inner side 5' 'on a total of 13 designated sliding surface, which is divided by a relief recess 14 in a first slide 13A and a second slide 13B.

For an optimal adaptation of the follower rollers 8 to tolerances on the guide surfaces 9 and sliding surfaces 13, the continuous follower roller 8, which preferably extends at least over the width of both guideways 9A, 9B or both slides 13A, 13B, a circumferential taper 15 in the form of a Specially adapted groove or the like. The circumferential taper 15 ensures that the follower roller 8 can flex elastically and thus can optimally rest with its remaining sections 8A, 8B on the guideways 9A, 9B and slide tracks 13A, 13B, so that the entire width of the Sections 8A, 8B in the support of the tension members 5A, 5B is available as a support surface. The introduced by the circumferential taper 15 and the relief recesses 11, 14 in the storage of the drive chains 3.4 elasticity causes an increase in the carrying capacity or actual load rating of the entire chain drawing machine. The follower rollers 8 may be single roles in special guides or, as shown, be designed as connected with tabs 16 roller chains. Since the tabs 16 mutually partially overlap in the immediate vicinity of the connecting pin 6 and thereby allow only a limited lateral bending of the roller chain, thus the tabs can partially compensate laterally acting executives. The tabs 16 take the task of a direct outer leadership true. In this case, the special guides may be formed as inner guide elements 31. These inner guide elements can hereby absorb laterally acting guiding forces and thus hold the follower rollers 8 in the region of the guide tracks 9. As a result, it is possible to dispense with fixed guide elements which are arranged between the sliding surface 13 and the guide surface 9.

It will be understood that the illustration of the geometries of the relief recesses 11, 14, the guideways 9A, 9B of the slideways 13A, 13B and the circumferential taper 15 is illustrative only and therefore purely exemplary; The actual optimization of these geometries depends on the overall machine concept. The relief recesses 11, 14 and the circumferential taper 15 as well as the guideways 9A, 9B and the slideways 13A, 13B may preferably be made, as shown, to have equal width dimensions, respectively.

In Fig. 2 An alternative embodiment is shown in half only. Identical components are provided with the same reference numerals. The difference to the embodiment according to Fig. 1 lies in the structure of the follower rollers 18. The follower rollers 18 here consist of two roller sets 18A, 18B, thus divided over the guide surface or sliding surface individual follower rollers; the first roller set 18A is associated with the guide and slide tracks 9A, 13A, the second roller set 18B is associated with the guide and slide tracks 9B, 13B. The roller assemblies 18A, 18B may be interconnected, eg, via roller cages (not shown), and / or the idlers 18 of the respective roller assemblies may be interconnected via tabs 16, as shown. Again, the tabs 16 may represent a direct outer leadership, since the tabs can absorb laterally acting executives. The inner guide elements 31 can receive laterally acting guiding forces, so that fixed guide elements are no longer needed even in this alternative embodiment for a perfect function in the region of the drawing path of the chain drawing machine.

At the in Fig. 3 illustrated embodiment, two sub-rollers 28A, 28B are provided for the follower rollers 28, which are arranged on an axis 29. In addition, a spacer 30 between the sub-rollers 28A, 28B is arranged on the axis 29, which serves to guide the idler rollers 28.

In this embodiment, the relief recess is dispensed with, and the adaptability or flexibility of the follower rollers is ensured by the spacer 30 between the sub-rollers. In this case, the spacer 30 simultaneously constitutes an inner guide element 31. Also in this embodiment is again dispensed with fixed guide elements, since the inner guide elements 31 can receive laterally acting executives. Since also in this embodiment lateral tabs 16 connect the idler rollers with each other, the tabs can also take direct external leadership here.

At the in Fig. 4 embodiment shown are also provided for the follower rollers 28, two sub-rollers 28A and 28B, which are arranged on an axis 29. Between these two sub-rollers 28A and 28B, in turn, an inner guide member 31 is arranged. Also in this embodiment will be the idler rollers 28 designed as connected to side tabs 16 roller chains. Between the inwardly directed follower roller-side surface 32 of the tabs 16 and the opposite side surfaces 33 (lateral surface of the machine frame 10) and 34 (outer side surface of the idler rollers 28) and 36 (lateral surface of the tension members 5), a guide plate 35 is arranged. This guide tab 35 is made of a lubricious material and holds the tools in a preferred position. In this case, the guide plate 35 slides in its inner upper region on the lateral surface 33 of the machine frame 10 and in its lower inner region on the lateral surface 36 of the tension members 5. At the outer lateral region, the guide plate 35 is partially in contact with the side flap 16 , The guide plates 35 preferably take on no or only very low tensile forces.

In Fig. 5 is a longitudinal section of a chain drawing machine 38 with an endlessly rotating upper drive chain 3 and an endlessly circulating lower drive chain 4 is shown. In the amount of a central axis 39, the tools or the tension members of the two drive chains 3, 4 converge in such a way that they convey the drawn material 1 in the direction of arrow 40 from left to right through the chain drawing machine 38. In each case, a drive chain runs over two sprockets 41 and 42, each one of the sprockets serves as a drive. Here, the teeth of the sprockets 41, 42 engage in the spaces between the connecting pin 6 and thus interact with the connecting pin 6 of the drive chains 3, 4 together. Between the tension members 5 and the machine frame 10, the follower rollers 18 and 28 are arranged. These idler rollers 18, 28 are in rolling contact in particular in the working area 43 with the tension members and the machine frame 10 and transmit the pressure forces arising in the working area 43 onto the machine frame 10.

In the figures, two guide and slide tracks are shown. But it can also be arranged several guide and slide tracks or more relief recesses and the follower rollers are then provided with a corresponding plurality of circumferential tapers or running as multiple roller sets.

Claims (17)

1. A chain drawing machine for continuously drawing workpieces that are to be drawn, such as more specifically metal bars and tubes and the like, said machine having at least two drivable drive chains assigned to a common drawing distance, each chain comprising drawing links that are attached together and are provided on the one side thereof with a clamp jaw adapted to be pressed against the workpiece that is to be drawn and on the other side thereof with a slide surface by which the drawing links are supported, through revolving, load-carrying idler rollers, on a rigid roller guide associated with each drive chain, characterized in that the idler rollers (8, 18, 28) interact with the slide surface (13) and/or with the roller guide (9) through a divided contact surface and are guided in the region where the contact surface is divided by guiding devices (31) following the movement of the rollers (8, 18, 28) only, said roller guides (9) for the drive chains (3; 4) and/or the slide surface (13) of the drawing links (5A, 5B) being divided into guide tracks (9A, 9B), respectively into slide tracks (13A, 13B), by means of at least one relief recess (11, 14).
2. The chain drawing machine in accordance with claim 1, characterized in that at least one relief recess (11, 14) divides the roller guide (9) and/or the slide surface (13) into two equal halves.
3. A chain drawing machine for continuously drawing workpieces that are to be drawn, such as more specifically metal bars and tubes and the like, said machine having at least two drivable drive chains assigned to a common drawing distance, each chain comprising drawing links that are attached together and are provided on the one side thereof with a clamp jaw adapted to be pressed against the workpiece that is to be drawn and on the other side thereof with a slide surface by which the drawing links are supported, through revolving, load-carrying idler rollers, on a rigid roller guide associated with each drive chain, characterized in that the idler rollers (8, 18, 28) interact with the slide surface (13) and/or the roller guide (9) through a divided contact surface and are guided in the region where the contact surface is divided by guiding devices (31) following the movement of the rollers (8, 18, 28) only, said idler rollers (28) being formed from at least two roller portions (28A, 28B) that are carried on a common axis (29) and a spacer (30) such as a sleeve that is disposed on the axis (29) being provided between said roller portions (28A, 28B).
4. The chain drawing machine in accordance with any one of the previous claims, characterized in that the idler rollers (8) extend along at least two guide tracks (9A, 9B).
5. The chain drawing machine in accordance with claim 4, characterized in that the idler rollers (8) comprise a circumferential taper (15) associated with the relief recesses (11, 14).
6. The chain drawing machine in accordance with claim 5, characterized in that the circumferential taper (15) permits limited elastic bending of the idler rollers (8) over their width.
7. The chain drawing machine in accordance with claim 1, characterized in that the idler rollers (18) consist of track roller sets (18A, 18b) that are guided parallel to each other, a respective one of the track roller sets (18A, 18B) being associated with each guide track (9A, 9B) and/or slide track (13A, 13B).
8. The chain drawing machine in accordance with claim 7, characterized in that the track roller sets are connected to each other through track roller cages.
9. The chain drawing machine in accordance with claim 7 or 8, characterized in that the track roller sets (18A, 18B) are configured to be chains.
10. The chain drawing machine in accordance with any of the claims 1 through 9, characterized in that the guide tracks (9A; 9B) and the slide tracks (13A, 13B) are oppositely disposed from each other and have the same shape and/or the same width.
11. The chain drawing machine in accordance with any of the claims 1 through 10, characterized in that two guide tracks (9A, 9B) and/or two slide tracks (13A, 13B) are provided.
12. The chain drawing machine in accordance with any of the claims 1 through 11, characterized in that the drawing links (5A, 5B) are connected by means of a connecting bolt (6), track rollers and/or drawing pieces being disposed on said connecting bolt on either side of the drawing links.
13. The chain drawing machine in accordance with any of the claims 1 through 12, characterized in that the clamp jaws (2) and the slide surfaces (13) are disposed on opposite parallel sides (5', 5") of the drawing links (5A, 5B).
14. The chain drawing machine in accordance with any of the claims 1 through 13, characterized in that the clamp jaws (2) and the slide surfaces (13) or the slide tracks (13A, 13B) are integrally incorporated into the drawing links (5A, 5B).
15. The chain drawing machine in accordance with any of the claims 1 through 14, characterized in that the idler rollers (8, 18, 28) are joined together to form a chain.
16. The chain drawing machine in accordance with any of the claims 1 through 15, characterized in that inner guide members (31) take laterally acting guide forces, follow the movement of the rollers (8, 18, 28), are disposed in the region where the contact surface is divided (14) and do not come into operative contact with stationary guide elements in the lateral direction.
17. The chain drawing machine in accordance with any of the claims 1 through 16, characterized in that the track roller sets (8, 18, 28) comprise inner guide members (31) that are disposed between the slide surface (13) and the guide surface (9) without coming into operative contact with laterally non-moving components.

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