CA1149272A - Method and apparatus for bending elongated pieces - Google Patents
Method and apparatus for bending elongated piecesInfo
- Publication number
- CA1149272A CA1149272A CA000368104A CA368104A CA1149272A CA 1149272 A CA1149272 A CA 1149272A CA 000368104 A CA000368104 A CA 000368104A CA 368104 A CA368104 A CA 368104A CA 1149272 A CA1149272 A CA 1149272A
- Authority
- CA
- Canada
- Prior art keywords
- bending
- elongated piece
- longitudinal axis
- slide
- rolls
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
- B21D11/14—Twisting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/08—Bending rods, profiles, or tubes by passing between rollers or through a curved die
Abstract
ABSTRACT OF THE DISCLOSURE
A method and apparatus for bending an elongated pisce, wherein the piece is fed to and held by feeding rolls and bending rolls which are spaced from each other, the piece is bent by displacing the bending rolls in directions perpendicular to the longitudinal axis of the piece and is twisted by rotating the bending rolls about the longitudinal axis of the piece.
A method and apparatus for bending an elongated pisce, wherein the piece is fed to and held by feeding rolls and bending rolls which are spaced from each other, the piece is bent by displacing the bending rolls in directions perpendicular to the longitudinal axis of the piece and is twisted by rotating the bending rolls about the longitudinal axis of the piece.
Description
BACKGROUND OF THE INVFNTION
This in~ention relates to a method and apparatus for bending an elongated piece, such as a rod or a bar, and particularly to a method and apparatus for successively bending and twisting such an elongated piece in directions perpendicular to and about the longitudinal axis of the piece.
The piece,i.e, the elongated member to be bent, ( ~ referred to hereina~ter is a decorative molding which is applied to the outer side faces of a vehicle body of an automobile to protect the body from the formation of undesirable scratches which would otherwise appear on the body, for example when the automobile acoidentally comes into contact with another automobile. However, in this inve~tion, the piece i~ not limiteld to such a decorative molding, and the invention is applicable to any kind o~
long or elongated products.
, It i~ necessary to bent and twist the decorative molding so a~ to have curved configurations corre~ponding to the cur~ed outer side faces o~ an automobile body to which the decorative molding~ are to be applied, ~o that the moldings can be closely adhered to the side face~ of the automobile body. Usually, the aecorative molding i~
bent in horizontal and vextical directions which are , ~g .
~ 3'~'~Z
perpendiculax to the longitudinal axis of the molding.
In addition,the molding is usually twisted about -the longitudinal axis thereof.
The present invention is directed to a method and an apparatus for succe~sively bending twisting an elongated piece in horizontal and vertical directions.
perpendicular to and about the longitudinal axis of the piece~
SUMMARY OF THE INVENTION
- .
The primary obje t of the present invention i~
to provide a bending method and apparatus which can bend an elongated piece in desired directions by a single operation.
Another object of the present. invention is to provide a bending apparatus which can successively bend an elongated pîece.
. .
Still another object o~ the present invention i~ to provide a bending. apparatu~ which can effectively . and simply bend an~.elongated piece and which can be a~tomatically controlled by a n~umerical control machine -which is per se known.
: - 2 -BRIEF DESCRIPTION OF THE DRAWINGS
The invention will become more apparent from the detailed description o~ the preferred embodiment which is illustrated in the accompanying drawings in which Fig~ 1a is a plan view of a decorative molding which is to be bent;
Fig. lb is a side elevational view of Fig. 1a;
Fig, 2 is a perspective view of a decorative molding which i9 to be twisted;
Fig. 3 is a side elevational view of a bending apparatus 9 according to the present invention;
Fig. ~ is a partially sectioned side elevational view of a feeding unit illu3trated in Fig. 3;
f ~ig. 5 is an elevational view of a bending unit of a bendin~ apparatus, according to the present invention;
Fig. 6 is an enlarged elevational view of a roll holder;
~ 2 Fig, 7a i~ a schematically illu~trated ~lan view of a bending apparatu~ in which an elongated piece is bent in a horizontal direction;
Fig, 7b is a schematically sho~m side elevational view of a bending apparatus in which an elongated piece is bent in a vertical direction, Fig. 7c is a schematical elevational view of a bending apparatus in which an elongated piece i9 twiste~
about it~ longitudinal axis;
~ 3 Fi.g~ 8a shows a plan view of an elongated piece which is to be bent in a horizo.ntal di~ectionv and a table which shows bending conditions of the piece in a horizontal direction;
Fig~ 8b show~ a side ele\vational view of an elongated piece which i~ to be bent in a vertical direction, and a table which shows bending conditions of the piece irL a vertical direction;
.
Figc 8c shows a side elevatiorLal view of an elongated piece which is to be twistea about its Iongitudinal axis, and a table which shows twisting conditions o~ the piece; and Figo 9 i~ a block diagram of the arrangement in which a bending apparatus is controlled by a neumerical control machine.
DETAI~ED DESCRIPTION OF THE INVENTIO~
The piece, i.e. the decorative molding M is xequi~red to be bent in a horizontal direction Y - Y' ( Fig. 1a ) and in a vertical direction Z - Z'( Fig. 1b ).
~hese directions are both perpendicular to the longitudinal axis X - X' of the molding M. In addition, the molding `10 M must be twisted by an angle ~ ( Fig. 2 ) about the longitudinal axis X - X'~
The apparatus essentially comprises a feeding u~it 10 having feeding rolls 11 and a bending unit 20 having rolls 61, as illustrated i~l Fig. 3. The piece, i.e, the decorative molding M i~ ~3uccessively bxought into an operational po~ition in which the molding M is located between the ~eeding rolls 11 and the bending rolls ( ~ 61 to be bent andJor twi~ted~ ~he di~tance between the bending rolls and t~e feeding rolls depends on the desired length o~ one molding M. ~he molding M is held by the feeding rolls 11 and the bending rolls 61~ When the molding M is bent or twisted, the feeding rolls serve as a ~tationary ~upport and the bending rolls 61 serve as a movable support. That is, the bending roll~ 61 can be not only moved in a horizontal direction Y - Y' and 7~
in a vertical direction Z - Z' but also rotated about the longitudinal axis X - X' of the molding M. ~he movement of the bending rolls in the directions Y - Y' and Z - Z' and the rotation thereof can be independently effected. A predetermined length of the bent and twisted molding is cut by a cutter 70. Thus, decorative molding7 i.eO product~ can~be successively manufactured~
The feeding unit ~0 has a pair of feeding rolls 11 which successively feed the molding M to the bending rolls 61 of the bending unit 20 ( Fig. 3 ), as illuætrated in Figo 4. The feeding unit 10 also has driving rolls 15 which are connected to and driven by a driving motor 19. The molding M is moved by the driving rolls 15.
~he feeding rolls 11 are provided with feeding grooves 12 in which the molding M is fitted. The numeral 16 designates a chain. Preferably, the axes of the driving rolls 15 are prependicular to the axes of the feeding rolls 11, so that the molding M can be precisely located in a predetermined position.
( .:? ,, The bending unit 20 is spaced at a predetermined separation from the feeding unit 10 and is aligned on a feeding line. ~he bending unit 20 includes a bed 21 7 a first slide 30, a second slide 40, a frame 50 and a bending roll holder 60. The bed 21 is secured to the base 22 and supports the first slide 30 at the center portion of the bed. The first slide 30 has upper and ~fi~ 2 lower shaft 31, 31 secured thereto, which are slidably supported by bearings 29, 29 provided in the bed 21.
The slide 30 can be moved by a ball screw device 25 or a hydraulic cylinder (not shown), in the direction o~
horizontal axis Y - Y' prependicular to the feedin~
direction X - X' of the molding M~ The deYice 25 is driven by a drive such as a motor 26 which is provided in the bed 21.
The second slide 40 is movable in the direction of vertical axis Z - Z' perpendicular to the axis X - X', ( ~
relative to the first slide 30. That is, the seeond ~lide 40 can be moved in the vertical directions on~the first slide 30 by means o~ a ball screw dsvice 35 or a cylinder devlce (not shown), provided in the first slide 30. As can be understood from the above discus~ion, the ~econd slide 40 is thus movable not only in the directions Y - Y' but also in the directions Z - æ ~ t relative to the molding M. The de~ice 35 is driven by a motor 36 which i~ supported by the first slide 30. The second slide 40 ~-~ has flanges 41~ 41 which a.re fitted in corre~ponding guide grooves 379 37 of the first slide, so that the second slide 40 slides along the guide grooves 37, 37 with the help of the flanges 419 41.
.
The frame 50 is rotatable about the axis X - X'~
in directions designated by an arrow d, relative to the first slide 30O For the purpose o~ this rotational 9~
movement, the disk-shaped frame is provided, on ïts outer periphery, with teeth 51 which can be engaged by ~upporting gears 46 supported by the second slide 40.
The frame 50 has an opening 50a in which the bending roll holder 60 is arranged. The peripheral teeth 51 of the frame 50 are engaged also by a drive gear 45 which is supported by the second slide 40 and which is driven by a motor 45a, so that the frame 50 can rotate.
~0 The holder 60 which is fitted in the opening 50a of the frame 50 supports the bending rolls 61 in such a way that the rolls 61 are movable in directions perpendicular to the axis X-X' of the molding M.
That is, as can be seen from Fig" 6, the holder 60 includes a stationary outer ring 69 and a movable inner ring 67 whioh i~ rotatably pivot~3d to two opposed shafts 68, 68 secured to the outer ring 69. Futher, the holder 60 includes a support 65 which is rotatably pivoted to tWQ opposed shafts 66 perpendicular to the . 0 shaft 68, The support 65 hold~ the pair of bending rolls 61 which hold the molding M therebetween and which are rotatable about their shafts 63, 63. Thus, the rolls 61 which are rotatable about the shaft 63, 63 are rotatable about two pairs of supporting shafts 66, 68 which are located pérpendicularly to each other.
The holder 60 is mounted to the frame 50 byisecuring the outer ring 69 of the holder 60 to the periphral ~ '7~
wall of the opening 50a of the frame 50 90 that~the holder 60 can rotate with the frame 50 in the directions d (Fig. 5).
It should be noted that the first slide 30 can be replaced by the ~econd slide 40 and vice versa.
That is, it i8 ~190 possible to modify the arrangement of the first slide 30 and the second slide 40 which are movabl~e in ~he directions Y - Y' and Z - Z' 9 respecti~ely in the illu~trated embodiment, in such a way that the first and second slides 30 and 40 are movable in the ( ~
~ directions Z - Z' and Y - Y', respectively.
The apparatus according to the present invention operates as follows (Fig. 7a- 7c).
With reference to Fig. 7a, the molding M is bent in the horizontal direction Y - Y' by moving the bendi~g unit 20 in the horizontal direction Y - Y'. For this purpose, the first slide 30 (Fig. 5) moves by a predeter-C mined distance y, in the Y ~ Y~ direction. The radius Ry of curvature of the molding M thus bent is obtained frsm the following equation;
~2 ~ y2 Ry = _ _ 2y wherein L is a constant distance between the feeding rolls 11 and the bending rolls 610 _ 9 _ .
~9~
In Fig. 7b, the molding M i~ bent in the vertical direction Z - Z', In this case, the second slide 40 (Figo 5) moves upwards by a predetermined distance æ
in the Z - æ ~ direction. The radius of curvature Rz of the bent molding M is represented by the following equation;
~2 ~ z2 Rz 2z In Fig. 7c, the molding M is twisted about the axis X - ~' thereof. For this purpose, the frame 50 (Fig. 5) rotates by a predetermined angle ~ in the counterclockwise direction.
Preferably, in order to increase the producti~ity of the molding, the three kinds of operations mentioned above are effected at one time.
In Fig. 8a - 8c~ dimen-tional conditions for three different operations of the molding M are illustrated.
C ~, r , The desi~ed shape of the product is determined by three factors consisting of the radii Ry and Rz, and the angle ~ , in relation to a length of the product in the axis X - X'. On the basis of these factors~
the rotational and linear displacements of the bending roll~ in the three kin~s o~ directions are determined~
_ 10 -a~
~he signals corresponding to the displacements are fed to the re~pective drives to bend and twist the molding M in the Y - Y' and Z - Z' directions and about the axis X - X', preferably at one time9 respectively.
When the molding M has a certain elasticity5 there may be a dimentional difference between the actual radius and an intented radius, due to a possible buckling.
In such a case, it i~ practically prefarable to determine the displacements of the bending rolls, taking a correction coefficient which i~ given by the intended radius divided by the actual measurement, into consideration.
It i9 also possible to partially change the feeding velooity(i.e. the linear velocity) of the molding M in the axial direction X - X'. ~he feeding velocity affect~ the velocities of the displacements o~ the bending rolls in the Y - Y' and Z - Z' directions and in the angular direction about the axis X - X'~ That is, the radii decrea~e9 the velocities of the displacement~
( increase, and vice versa. The molding M illustrated in Fig9. 8a - 8c has a gentle curve haYing sections of large radii of curvature. In Figs. 8a -8c, the linear velocity of the molding M in the X - X' direction was set at 10 m/min( constant )~ ~he velocities V of the displacements of the bending xolls in the three directions are given by the following equation;
'72 D [mm) V [mm/seC~ ~ X Vc Lmm/secOJ
wherein D is the displacement of the bending rolls, Li i3 the distance of the section X1,X2..Xi.,Xn~
Vc is the feeding velocity of the molding(const~t3. -In the tables of Fig. 8a - 8c, the arrow~ designate ~ections in which the variatio~ is relatively small~
{ ~ Finally, Fig.9 ~hows a block diagram of the arrangement for controlling the bending apparatus by means of a NC machine which is per se known. The values and the velocities of the displacements are input into the ~C machine. In Fig. 9, the detector detect~ the length of the section~ of the molding M :in the axial direction X - X'from the ~et feeding velocity of the molding to command not only the operation of the drive~ of the bending unit in order to move and rotate the be~ding rolls in the Y - Y~ and Z - Z' direction~ and about the ~~ X X' axis~ respectively, but al~o the operation of the cuttor in order to cut the molding at a de~ired length.
~ - 12 -.. ..
This in~ention relates to a method and apparatus for bending an elongated piece, such as a rod or a bar, and particularly to a method and apparatus for successively bending and twisting such an elongated piece in directions perpendicular to and about the longitudinal axis of the piece.
The piece,i.e, the elongated member to be bent, ( ~ referred to hereina~ter is a decorative molding which is applied to the outer side faces of a vehicle body of an automobile to protect the body from the formation of undesirable scratches which would otherwise appear on the body, for example when the automobile acoidentally comes into contact with another automobile. However, in this inve~tion, the piece i~ not limiteld to such a decorative molding, and the invention is applicable to any kind o~
long or elongated products.
, It i~ necessary to bent and twist the decorative molding so a~ to have curved configurations corre~ponding to the cur~ed outer side faces o~ an automobile body to which the decorative molding~ are to be applied, ~o that the moldings can be closely adhered to the side face~ of the automobile body. Usually, the aecorative molding i~
bent in horizontal and vextical directions which are , ~g .
~ 3'~'~Z
perpendiculax to the longitudinal axis of the molding.
In addition,the molding is usually twisted about -the longitudinal axis thereof.
The present invention is directed to a method and an apparatus for succe~sively bending twisting an elongated piece in horizontal and vertical directions.
perpendicular to and about the longitudinal axis of the piece~
SUMMARY OF THE INVENTION
- .
The primary obje t of the present invention i~
to provide a bending method and apparatus which can bend an elongated piece in desired directions by a single operation.
Another object of the present. invention is to provide a bending apparatus which can successively bend an elongated pîece.
. .
Still another object o~ the present invention i~ to provide a bending. apparatu~ which can effectively . and simply bend an~.elongated piece and which can be a~tomatically controlled by a n~umerical control machine -which is per se known.
: - 2 -BRIEF DESCRIPTION OF THE DRAWINGS
The invention will become more apparent from the detailed description o~ the preferred embodiment which is illustrated in the accompanying drawings in which Fig~ 1a is a plan view of a decorative molding which is to be bent;
Fig. lb is a side elevational view of Fig. 1a;
Fig, 2 is a perspective view of a decorative molding which i9 to be twisted;
Fig. 3 is a side elevational view of a bending apparatus 9 according to the present invention;
Fig. ~ is a partially sectioned side elevational view of a feeding unit illu3trated in Fig. 3;
f ~ig. 5 is an elevational view of a bending unit of a bendin~ apparatus, according to the present invention;
Fig. 6 is an enlarged elevational view of a roll holder;
~ 2 Fig, 7a i~ a schematically illu~trated ~lan view of a bending apparatu~ in which an elongated piece is bent in a horizontal direction;
Fig, 7b is a schematically sho~m side elevational view of a bending apparatus in which an elongated piece is bent in a vertical direction, Fig. 7c is a schematical elevational view of a bending apparatus in which an elongated piece i9 twiste~
about it~ longitudinal axis;
~ 3 Fi.g~ 8a shows a plan view of an elongated piece which is to be bent in a horizo.ntal di~ectionv and a table which shows bending conditions of the piece in a horizontal direction;
Fig~ 8b show~ a side ele\vational view of an elongated piece which i~ to be bent in a vertical direction, and a table which shows bending conditions of the piece irL a vertical direction;
.
Figc 8c shows a side elevatiorLal view of an elongated piece which is to be twistea about its Iongitudinal axis, and a table which shows twisting conditions o~ the piece; and Figo 9 i~ a block diagram of the arrangement in which a bending apparatus is controlled by a neumerical control machine.
DETAI~ED DESCRIPTION OF THE INVENTIO~
The piece, i.e. the decorative molding M is xequi~red to be bent in a horizontal direction Y - Y' ( Fig. 1a ) and in a vertical direction Z - Z'( Fig. 1b ).
~hese directions are both perpendicular to the longitudinal axis X - X' of the molding M. In addition, the molding `10 M must be twisted by an angle ~ ( Fig. 2 ) about the longitudinal axis X - X'~
The apparatus essentially comprises a feeding u~it 10 having feeding rolls 11 and a bending unit 20 having rolls 61, as illustrated i~l Fig. 3. The piece, i.e, the decorative molding M i~ ~3uccessively bxought into an operational po~ition in which the molding M is located between the ~eeding rolls 11 and the bending rolls ( ~ 61 to be bent andJor twi~ted~ ~he di~tance between the bending rolls and t~e feeding rolls depends on the desired length o~ one molding M. ~he molding M is held by the feeding rolls 11 and the bending rolls 61~ When the molding M is bent or twisted, the feeding rolls serve as a ~tationary ~upport and the bending rolls 61 serve as a movable support. That is, the bending roll~ 61 can be not only moved in a horizontal direction Y - Y' and 7~
in a vertical direction Z - Z' but also rotated about the longitudinal axis X - X' of the molding M. ~he movement of the bending rolls in the directions Y - Y' and Z - Z' and the rotation thereof can be independently effected. A predetermined length of the bent and twisted molding is cut by a cutter 70. Thus, decorative molding7 i.eO product~ can~be successively manufactured~
The feeding unit ~0 has a pair of feeding rolls 11 which successively feed the molding M to the bending rolls 61 of the bending unit 20 ( Fig. 3 ), as illuætrated in Figo 4. The feeding unit 10 also has driving rolls 15 which are connected to and driven by a driving motor 19. The molding M is moved by the driving rolls 15.
~he feeding rolls 11 are provided with feeding grooves 12 in which the molding M is fitted. The numeral 16 designates a chain. Preferably, the axes of the driving rolls 15 are prependicular to the axes of the feeding rolls 11, so that the molding M can be precisely located in a predetermined position.
( .:? ,, The bending unit 20 is spaced at a predetermined separation from the feeding unit 10 and is aligned on a feeding line. ~he bending unit 20 includes a bed 21 7 a first slide 30, a second slide 40, a frame 50 and a bending roll holder 60. The bed 21 is secured to the base 22 and supports the first slide 30 at the center portion of the bed. The first slide 30 has upper and ~fi~ 2 lower shaft 31, 31 secured thereto, which are slidably supported by bearings 29, 29 provided in the bed 21.
The slide 30 can be moved by a ball screw device 25 or a hydraulic cylinder (not shown), in the direction o~
horizontal axis Y - Y' prependicular to the feedin~
direction X - X' of the molding M~ The deYice 25 is driven by a drive such as a motor 26 which is provided in the bed 21.
The second slide 40 is movable in the direction of vertical axis Z - Z' perpendicular to the axis X - X', ( ~
relative to the first slide 30. That is, the seeond ~lide 40 can be moved in the vertical directions on~the first slide 30 by means o~ a ball screw dsvice 35 or a cylinder devlce (not shown), provided in the first slide 30. As can be understood from the above discus~ion, the ~econd slide 40 is thus movable not only in the directions Y - Y' but also in the directions Z - æ ~ t relative to the molding M. The de~ice 35 is driven by a motor 36 which i~ supported by the first slide 30. The second slide 40 ~-~ has flanges 41~ 41 which a.re fitted in corre~ponding guide grooves 379 37 of the first slide, so that the second slide 40 slides along the guide grooves 37, 37 with the help of the flanges 419 41.
.
The frame 50 is rotatable about the axis X - X'~
in directions designated by an arrow d, relative to the first slide 30O For the purpose o~ this rotational 9~
movement, the disk-shaped frame is provided, on ïts outer periphery, with teeth 51 which can be engaged by ~upporting gears 46 supported by the second slide 40.
The frame 50 has an opening 50a in which the bending roll holder 60 is arranged. The peripheral teeth 51 of the frame 50 are engaged also by a drive gear 45 which is supported by the second slide 40 and which is driven by a motor 45a, so that the frame 50 can rotate.
~0 The holder 60 which is fitted in the opening 50a of the frame 50 supports the bending rolls 61 in such a way that the rolls 61 are movable in directions perpendicular to the axis X-X' of the molding M.
That is, as can be seen from Fig" 6, the holder 60 includes a stationary outer ring 69 and a movable inner ring 67 whioh i~ rotatably pivot~3d to two opposed shafts 68, 68 secured to the outer ring 69. Futher, the holder 60 includes a support 65 which is rotatably pivoted to tWQ opposed shafts 66 perpendicular to the . 0 shaft 68, The support 65 hold~ the pair of bending rolls 61 which hold the molding M therebetween and which are rotatable about their shafts 63, 63. Thus, the rolls 61 which are rotatable about the shaft 63, 63 are rotatable about two pairs of supporting shafts 66, 68 which are located pérpendicularly to each other.
The holder 60 is mounted to the frame 50 byisecuring the outer ring 69 of the holder 60 to the periphral ~ '7~
wall of the opening 50a of the frame 50 90 that~the holder 60 can rotate with the frame 50 in the directions d (Fig. 5).
It should be noted that the first slide 30 can be replaced by the ~econd slide 40 and vice versa.
That is, it i8 ~190 possible to modify the arrangement of the first slide 30 and the second slide 40 which are movabl~e in ~he directions Y - Y' and Z - Z' 9 respecti~ely in the illu~trated embodiment, in such a way that the first and second slides 30 and 40 are movable in the ( ~
~ directions Z - Z' and Y - Y', respectively.
The apparatus according to the present invention operates as follows (Fig. 7a- 7c).
With reference to Fig. 7a, the molding M is bent in the horizontal direction Y - Y' by moving the bendi~g unit 20 in the horizontal direction Y - Y'. For this purpose, the first slide 30 (Fig. 5) moves by a predeter-C mined distance y, in the Y ~ Y~ direction. The radius Ry of curvature of the molding M thus bent is obtained frsm the following equation;
~2 ~ y2 Ry = _ _ 2y wherein L is a constant distance between the feeding rolls 11 and the bending rolls 610 _ 9 _ .
~9~
In Fig. 7b, the molding M i~ bent in the vertical direction Z - Z', In this case, the second slide 40 (Figo 5) moves upwards by a predetermined distance æ
in the Z - æ ~ direction. The radius of curvature Rz of the bent molding M is represented by the following equation;
~2 ~ z2 Rz 2z In Fig. 7c, the molding M is twisted about the axis X - ~' thereof. For this purpose, the frame 50 (Fig. 5) rotates by a predetermined angle ~ in the counterclockwise direction.
Preferably, in order to increase the producti~ity of the molding, the three kinds of operations mentioned above are effected at one time.
In Fig. 8a - 8c~ dimen-tional conditions for three different operations of the molding M are illustrated.
C ~, r , The desi~ed shape of the product is determined by three factors consisting of the radii Ry and Rz, and the angle ~ , in relation to a length of the product in the axis X - X'. On the basis of these factors~
the rotational and linear displacements of the bending roll~ in the three kin~s o~ directions are determined~
_ 10 -a~
~he signals corresponding to the displacements are fed to the re~pective drives to bend and twist the molding M in the Y - Y' and Z - Z' directions and about the axis X - X', preferably at one time9 respectively.
When the molding M has a certain elasticity5 there may be a dimentional difference between the actual radius and an intented radius, due to a possible buckling.
In such a case, it i~ practically prefarable to determine the displacements of the bending rolls, taking a correction coefficient which i~ given by the intended radius divided by the actual measurement, into consideration.
It i9 also possible to partially change the feeding velooity(i.e. the linear velocity) of the molding M in the axial direction X - X'. ~he feeding velocity affect~ the velocities of the displacements o~ the bending rolls in the Y - Y' and Z - Z' directions and in the angular direction about the axis X - X'~ That is, the radii decrea~e9 the velocities of the displacement~
( increase, and vice versa. The molding M illustrated in Fig9. 8a - 8c has a gentle curve haYing sections of large radii of curvature. In Figs. 8a -8c, the linear velocity of the molding M in the X - X' direction was set at 10 m/min( constant )~ ~he velocities V of the displacements of the bending xolls in the three directions are given by the following equation;
'72 D [mm) V [mm/seC~ ~ X Vc Lmm/secOJ
wherein D is the displacement of the bending rolls, Li i3 the distance of the section X1,X2..Xi.,Xn~
Vc is the feeding velocity of the molding(const~t3. -In the tables of Fig. 8a - 8c, the arrow~ designate ~ections in which the variatio~ is relatively small~
{ ~ Finally, Fig.9 ~hows a block diagram of the arrangement for controlling the bending apparatus by means of a NC machine which is per se known. The values and the velocities of the displacements are input into the ~C machine. In Fig. 9, the detector detect~ the length of the section~ of the molding M :in the axial direction X - X'from the ~et feeding velocity of the molding to command not only the operation of the drive~ of the bending unit in order to move and rotate the be~ding rolls in the Y - Y~ and Z - Z' direction~ and about the ~~ X X' axis~ respectively, but al~o the operation of the cuttor in order to cut the molding at a de~ired length.
~ - 12 -.. ..
Claims (8)
1. A method for bending an elongated piece which is conveyed in a direction of its longitudinal axis, comprising:
a) successively feeding the elongated piece to feeding rolls and bending rolls arranged in this order in the longitudinal direction of the elongated piece, at a separation of a predetermined distance, and b) bending the elongated piece in directions perpendicular to the longitudinal axis of the elongated piece and twisting the elongated piece about the longitudinal axis thereof, independently of the bending operation.
a) successively feeding the elongated piece to feeding rolls and bending rolls arranged in this order in the longitudinal direction of the elongated piece, at a separation of a predetermined distance, and b) bending the elongated piece in directions perpendicular to the longitudinal axis of the elongated piece and twisting the elongated piece about the longitudinal axis thereof, independently of the bending operation.
2. A method according to claim 1, wherein the bending rolls are movable in directions perpendicular to the longitudinal axis of the elongated piece to bend the elongated piece and are rotatable about the longitudinal axis of the elongated piece to twist the latter.
3. A method according to claim 1 or 2, wherein the bending operation and the twisting operation are effected at one time.
4. An apparatus for bending an elongated piece which is conveyed in the longitudinal direction thereof, comprising a feeding unit having a pair of feeding rolls and a bending unit having a pair of bending rolls, said feeding rolls and bending rolls being arranged in this order along the longitudinal axis of the elongated piece at a separation of a predetermined distance, said bending unit comprising means for displacing the bending rolls in directions perpendicular to the longitudinal axis of the elongated piece to bend the latter in the directions perpendicular to the longitudinal axis of the elongated piece, and means for rotating the bending rolls about the longitudinal axis of the elongated piece to twist the elongated piece.
5. An apparatus according to claim 4, wherein said bending unit comprises a bed, a first slide which is movable on the bed in directions perpendicular to the longitudinal axis of the elongated piece, a second slide which is movable on the first slide in directions which are different from the directions of the movement of the first slide and which are perpendicular to the longitudinal axis of the elongated piece, independently of the movement of the first slide, a frame device which rotatably holds the bending rolls.
6. An apparatus according to claim 5, wherein said first slide is movable in horizontal directions and said second slide is movable in vertical directions.
7. An apparatus according to claim 5, wherein said first slide is movable in vertical directions and said second slide is movable in horizontal directions.
8. An apparatus according to any one of claim 5-7, wherein said frame device comprises an outer ring frame which is secured to the second slide, an inner ring frame which is rotatably supported by the outer ring frame, said inner ring frame being rotated about an axis perpendicular to the longitudinal axis of the elongated piece, and a bending roll holder which is rotatably supported by the inner ring frame and which rotatably holds the bending rolls, said bending roll holder being rotated about an axis perpendicular to the axis of the rotational movement of the inner ring frame and to the longitudinal axis of the elongated piece.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55-5580 | 1980-01-21 | ||
| JP558080A JPS56102319A (en) | 1980-01-21 | 1980-01-21 | Method and apparatus for bending long sized material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1149272A true CA1149272A (en) | 1983-07-05 |
Family
ID=11615165
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000368104A Expired CA1149272A (en) | 1980-01-21 | 1981-01-08 | Method and apparatus for bending elongated pieces |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US4367641A (en) |
| EP (1) | EP0032795B1 (en) |
| JP (1) | JPS56102319A (en) |
| CA (1) | CA1149272A (en) |
| DE (1) | DE3166219D1 (en) |
Families Citing this family (39)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5950917A (en) * | 1982-09-17 | 1984-03-24 | Hashimoto Forming Co Ltd | Method and device for manufacturing lace, sash, or the like made of metallic sheet |
| JPS59179233A (en) * | 1983-03-31 | 1984-10-11 | Hashimoto Forming Co Ltd | Mechanism for inserting and feeding forming material for molding or the like |
| EP0152224B1 (en) * | 1984-01-30 | 1990-07-18 | Hashimoto Forming Industry Co Ltd | Apparatus for producing articles bent in up to three dimensions |
| EP0231092B1 (en) * | 1986-01-29 | 1991-08-21 | Ronald Edward Benton | Bending machine |
| GB8602147D0 (en) * | 1986-01-29 | 1986-03-05 | Benton R E | Bending machine |
| JPS62179818A (en) * | 1986-01-31 | 1987-08-07 | Hashimoto Forming Co Ltd | Axial line bending device for long sized material to be worked |
| JPS62240108A (en) * | 1986-04-10 | 1987-10-20 | Hamana Tekko Kk | Apparatus for continuous production of internally spiral-grooved pipe |
| GB8621725D0 (en) * | 1986-09-09 | 1986-10-15 | British Aerospace | Forming elongate structural components |
| JPH01154824A (en) * | 1987-12-10 | 1989-06-16 | Chuo Electric Mfg Co Ltd | Bending device |
| JPH0811256B2 (en) * | 1987-12-10 | 1996-02-07 | 株式会社中央電機製作所 | Bending material supply device |
| DE3825393C1 (en) * | 1988-07-26 | 1989-08-03 | Alpha Maschinenbau Ag, Zuerich, Ch | |
| US5752705A (en) * | 1988-12-01 | 1998-05-19 | Ae Piston Products Limited | Piston rings |
| US5239850A (en) * | 1989-06-08 | 1993-08-31 | Chuo Electric Mfg. Co., Ltd. | Method for bending elongated materials in a continuous manner |
| US5119533A (en) * | 1989-06-08 | 1992-06-09 | Chuo Electric Mfg. Co., Ltd. | Method for bending hollow material using a mandrel and for adjusting the shape of the mandrel |
| US5031291A (en) * | 1989-06-08 | 1991-07-16 | Chuo Electric Mfg. Co., Ltd. | Apparatus for bending elongated materials in a continuous manner |
| JPH0335822A (en) * | 1989-06-30 | 1991-02-15 | Hashimoto Forming Ind Co Ltd | Working method for bending long size work |
| GR1001322B (en) * | 1990-04-06 | 1993-08-31 | Panagiotis Anagnostopoulos | Mechanism for wire bending machines |
| DE69313727T2 (en) * | 1992-06-11 | 1998-03-19 | Itami Ind Co Ltd | Device for bending knife tape |
| JP3733176B2 (en) * | 1996-07-10 | 2006-01-11 | 株式会社オプトン | Bending machine |
| DE19717232A1 (en) * | 1997-04-24 | 1998-10-29 | Suban Ag | Method and device for three-dimensional bending of hollow metal profiles |
| US7076979B2 (en) | 1998-04-07 | 2006-07-18 | Robert Bosch Gmbh | Method and device for producing curved lengths of spring band steel |
| DE19816609A1 (en) * | 1998-04-15 | 1999-10-21 | Bosch Gmbh Robert | Process for manufacturing flat beam windshield wipers for vehicles with curved flat beams |
| NL1010174C1 (en) * | 1998-09-24 | 2000-03-27 | Busschers Metaalbedrijf Bv | Apparatus and method for bending tubular and rod-shaped material. |
| IT1308472B1 (en) * | 1999-05-04 | 2001-12-17 | Tauring S P A | BENDING MACHINE FOR PIPES, PROFILES OR SIMILAR |
| FR2806946B1 (en) * | 2000-04-04 | 2002-06-07 | Latour Et Fils | MACHINE FOR BENDING AND TURNING FLAT METAL WIRE |
| IT1320240B1 (en) | 2000-07-14 | 2003-11-26 | Tauring S P A | PROFILE BENDING MACHINE. |
| DE10214275A1 (en) * | 2002-03-28 | 2003-10-16 | Palima W Ludwig & Co | Bending machine for profiles and round tubes |
| US7111483B2 (en) * | 2003-09-19 | 2006-09-26 | Alco Industries | Method and apparatus for fabricating helically shaped ribbons of material |
| WO2005037458A2 (en) * | 2003-10-14 | 2005-04-28 | Century Specialties | Sweep unit assembly |
| JP4847825B2 (en) * | 2006-08-30 | 2011-12-28 | 旭精機工業株式会社 | MANUFACTURING METHOD FOR STRIP PLATE MATERIAL |
| DE102007013902A1 (en) * | 2007-03-20 | 2008-09-25 | Universität Dortmund | Device for profile bending |
| US20120131974A1 (en) * | 2007-12-12 | 2012-05-31 | Allied Tube & Conduit Corporation | Arching metallic profiles in continous in-line process |
| JP5452025B2 (en) * | 2008-05-19 | 2014-03-26 | 株式会社日立製作所 | Blades, impellers, turbo fluid machinery |
| DE102012219639A1 (en) * | 2012-05-31 | 2013-12-05 | Kunststoff-Technik Scherer & Trier Gmbh & Co. Kg | Method for roll bending a profile, profile, method for producing curved profile workpieces, curved profile workpiece, device for roll bending a profile and extrusion and roll bending line |
| CN103861903B (en) * | 2012-12-10 | 2015-12-02 | 上海航天精密机械研究所 | Aluminium alloy thin-walled deckle board pane bending apparatus |
| CN107297402A (en) * | 2017-07-28 | 2017-10-27 | 广州高谱机械科技有限公司 | The movement technique of bending roll machine working roll and the mechanism for realizing the movement technique |
| DE102018114580A1 (en) | 2018-06-18 | 2019-12-19 | copperING S.r.l. | Method and device for forming a winding element |
| US11579057B1 (en) * | 2019-05-24 | 2023-02-14 | Flex, Ltd. | Automated mandrel bend test |
| US11493414B2 (en) * | 2020-07-14 | 2022-11-08 | Flex Ltd. | Testing system for flexible sample in electronics having a retractable holder configured to conform a sample by a mandrel |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1463594A (en) * | 1919-10-11 | 1923-07-31 | Robert R Rust | Metal-twisting mechanism |
| US1772139A (en) * | 1929-01-07 | 1930-08-05 | Philadelphia Lawn Mower Compan | Twisting machine |
| BE436992A (en) * | 1937-10-09 | |||
| US2944582A (en) * | 1959-05-08 | 1960-07-12 | Century Die & Mfg Company | Metal stretch bending apparatus |
| US3058511A (en) * | 1960-01-21 | 1962-10-16 | Standard Railway Equipment Mfg | Contoured structural metallic sheet and method of forming same |
| US3280607A (en) * | 1963-08-01 | 1966-10-25 | Sheffield Corp | Machine tool |
| FR1379019A (en) * | 1963-10-08 | 1964-11-20 | Profil Sa Ind Financ Le | Mobile profile bender |
| GB1092578A (en) * | 1965-09-20 | 1967-11-29 | Dai Ichi Koshuha Kogyo Co Ltd | Methods of bending electrically conductive elongated materials such as bar, rod and pipe and means therefor |
| US3421351A (en) * | 1967-02-02 | 1969-01-14 | Beaver Precision Prod | Method of forming bar screws |
| US3678723A (en) * | 1970-02-12 | 1972-07-25 | Eriez Mfg Co | T-bar twister |
| US3673844A (en) * | 1970-02-20 | 1972-07-04 | Polaroid Corp | Method and apparatus for shaping temple pieces for spectacles |
| JPS5843165B2 (en) * | 1979-12-03 | 1983-09-26 | 株式会社 中央電機製作所 | Molding bending device |
-
1980
- 1980-01-21 JP JP558080A patent/JPS56102319A/en active Pending
- 1980-08-22 US US06/180,405 patent/US4367641A/en not_active Expired - Lifetime
-
1981
- 1981-01-08 CA CA000368104A patent/CA1149272A/en not_active Expired
- 1981-01-09 EP EP81300100A patent/EP0032795B1/en not_active Expired
- 1981-01-09 DE DE8181300100T patent/DE3166219D1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE3166219D1 (en) | 1984-10-31 |
| JPS56102319A (en) | 1981-08-15 |
| EP0032795B1 (en) | 1984-09-26 |
| EP0032795A3 (en) | 1982-08-25 |
| EP0032795A2 (en) | 1981-07-29 |
| US4367641A (en) | 1983-01-11 |
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