JP2014008531A - Pipe bending apparatus and pipe bending method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a pipe bending apparatus simple and smaller.SOLUTION: The apparatus has a pipe chuck unit mounted on a movable carriage reciprocating in a linear direction on a base. The pipe chuck unit includes: a chuck support base rotatively driven by a chuck rotating means provided on the movable carriage; a right-and-left pair of chuck holders mounted on the chuck support base; and a pair of chuck dies, each chuck die being moved in a close-and-apart direction by a driving means fixed to the chuck holder and having a groove on the facing surface to fit to the half peripheral part of a pipe. The apparatus includes a bending-roll die and a clamping die arranged ahead of a front end stop position of the movable carriage. While the pair of chuck dies on the movable carriage hold the pipe inserted from the upside, the chuck rotating means rotates the pipe, and the movable carriage moves to the front end stop position to hold the pipe by the bending-roll die and the clamping die for executing bending work in three-dimensional directions, and the movable carriage is returned to a predetermined position while the bending work is executed.

Description

  The present invention relates to a pipe bending apparatus and pipe bending method, and more particularly, to a pipe bending apparatus and pipe bending method for bending a pipe in which a high-voltage cable routed under a floor is inserted into a hollow portion in an electric vehicle or a hybrid vehicle in a three-dimensional manner. It is used.

In electric vehicles and hybrid vehicles, the wiring harness that is routed between the battery and the inverter, between the inverter and the motor, etc. includes a high-voltage cable that is a source of noise. In the underfloor wiring area, there is a case where a high-voltage cable is routed through a metal pipe as a protection for the wire harness and a shield measure for the high-voltage cable. The pipe through which the high-voltage cable is inserted is connected to a battery mounted on the floor panel by bending one end upward and connected to an inverter or the like in the engine room by bending the other end upward. . Further, an intermediate region sandwiched between both ends that are bent upward is also bent three-dimensionally according to the shape of the floor panel.
Further, since it is very difficult to insert the high-voltage cable after bending the pipe, it is necessary to bend the pipe after inserting the high-voltage cable into the straight pipe. Therefore, it is necessary to work so that the high-voltage cable is not damaged when the pipe is bent.

  As described above, since it is necessary to carefully handle the pipe through which the high-voltage cable is inserted during bending of the pipe, conventionally, a manipulator (robot) has been used and the pipe gripping chuck provided on the chuck carriage is used at the required position of the pipe. The pipe is gripped, the head portion is rotated and twisted at a required angle to feed a bent portion of the pipe between the bending roll mold and the clamping mold, and the pipe is subjected to the required bending process by the bending roll mold and the clamping mold. This procedure is performed a plurality of times for each bending portion of the pipe to bend the pipe into a required three-dimensional shape.

  However, when the pipe is bent by a bending roll mold and a clamping mold, the robot grips the portion of the pipe away from the bending portion with a chuck, so the overall length of the chuck carriage is increased, and the entire equipment is The size is increased and a large installation space is required. In addition, since the mechanism is complicated and the pipe moves in a complicated manner, it is difficult to determine the interference area between the pipe to be bent and other parts. In addition, the operation is complicated, it takes a long time to acquire the operation, and there are problems that are difficult to maintain. Furthermore, since the outer diameter of the high-voltage cable inserted into the pipe tends to increase and the pipe also increases in diameter, the gripping force of the pipe may be insufficient when the large-diameter pipe is bent.

  Although it is not an apparatus that bends a pipe through which the high-voltage cable is inserted, for example, Japanese Patent Laid-Open No. 2001-105033 (Patent Document 1) discloses a pipe bender that manufactures a bent pipe serving as a hydroforming material pipe used as a fluid transportation frame Has been proposed. The pipe bender has a structure shown in FIGS. 10A and 10B, and a bending mold 101 and a clamping mold (clamping mold) 102 are used with the core bar 100 inserted from the end of the pipe inside the pipe 200. The pipe 200 is sandwiched, and the pipe 200 is bent and formed along with the rotation of the bending die 101.

JP 2001-105033 A

  Since the pipe bender proposed in Patent Document 1 holds the pipe by inserting the core bar 100 into the hollow interior of the pipe to be bent, adopt it when the wire harness is inserted inside the pipe. There is a problem that can not be.

Moreover, since the pipe bender does not disclose means for twisting the pipe to be bent, it is unclear whether the pipe can be bent in a three-dimensional direction.
On the other hand, when the above-described conventionally used manipulator is used, there is a problem that it is complicated and large in size and high in cost and difficult to operate and repair.

  Therefore, the present invention provides a pipe bending apparatus and pipe bending apparatus that can bend a pipe in a three-dimensional direction with a wire or the like inserted through the pipe, that is simple in configuration, small in size, and easy to operate and repair. The challenge is to provide a method.

In order to solve the above problems, as a first invention,
A pipe chuck unit is mounted on a moving carriage that reciprocates in a linear direction on the base.
The pipe chuck unit includes a chuck support that is rotated by chuck rotating means installed on the movable carriage, a pair of left and right chuck holders mounted on the chuck support, and fixed to the chuck holders, respectively. A pair of chuck dies that are moved in the approaching and separating directions by the driving means and provided with a groove for fitting the half circumference of the pipe on the opposite surface,
A bending roll mold, a clamping mold and a pressure mold are arranged in front of the front end stop position of the movable carriage,
A pair of the chuck dies on the movable carriage holding the pipe inserted from above, rotating the pipe with the chuck rotating means and moving the movable carriage to a front end stop position; A pipe bending apparatus is provided, wherein a pipe is sandwiched between the clamping mold and bent in a three-dimensional direction, and the movable carriage is retracted to a predetermined position during the bending process.

In the pipe bending apparatus of the present invention having the above-described configuration, the pipe is sandwiched between a pair of left and right chuck dies, moved to a bending position, and twisted to the pipe. The pipe is pinched. In other words, by holding the pipe between the pair of left and right chuck dies, the bending can be performed with the high-voltage cable inserted in advance.
In addition, the pipe can be twisted by rotating the pipe together with the chuck mold and moving it to the bending position while holding the pipe between the chuck mold, and as a result, the bending roll mold and the clamping mold at a fixed position. The clamped pipe can be bent and rotated in a three-dimensional direction. Furthermore, since the movable carriage is reciprocated linearly on the base, and the bending roll mold and the clamping mold are arranged on the front end side of the movement area, the entire apparatus can be reduced in size and simplified, and the cost can be reduced. It can be easily operated and repaired.

As the chuck rotating means of the pipe chuck unit, a servo motor and a gear that is rotationally driven by the servo motor are provided on the movable carriage, and a large-diameter gear that meshes with the outer peripheral surface of one side in the axial direction. The chuck is fixed to the chuck support base, and the upper side of the large-diameter gear is an opening for inserting a pipe, and a ring is provided with a central space through which the pipe sandwiched by the chuck mold is continuously provided, and the opening The outer peripheral surface on the other side in the axial direction of the large-diameter gear is a smooth circular arc surface, and a plurality of bearings that support the circular arc surface of the large-diameter gear at a circumferential interval are provided on the movable carriage. Attached to wall material,
The servo motor rotates the gear to rotate the large-diameter gear, and rotates the pipe through the chuck support base, chuck holder and chuck mold at a required angle with a central axis as a fulcrum, and the rotation of the pipe is the movement It is possible to perform the bending process by rotating the bending roll mold in a three-dimensional direction by twisting the pipe by moving the carriage at the backward stop position, while moving from the reverse stop position to the front end stop position, or at the front end stop position. I have to.

In addition, a hydraulic cylinder is used as a driving means for bringing the pair of chuck dies close to and away from each other, the cylinder body is fixed to the chuck support, and the chuck holder is fixed to the tip of the rod protruding in the opposite direction from the cylinder body. Providing the semicircular arc-shaped groove on the opposite surface of the chuck mold, and firmly holding the pipe with the left and right chuck molds by inserting the half circumference of the pipe into the left and right chuck mold grooves; and
In a state where the left and right chuck dies are separated from each other, a pipe cradle is disposed below the chuck dies, and a pipe can be inserted onto the pipe cradle from above.

  The moving means for reciprocating the moving carriage on the base is not particularly limited. For example, an annular belt is wound around a pulley rotated by a servo motor, the moving carriage is fixed to the annular belt, and The moving carriage is moved forward and backward by reverse rotation. Alternatively, the pinion attached to the movable carriage may be engaged with a rack fixed on the base, and the pinion may be rotated by a servo motor to advance or retract the required distance. Furthermore, a screw shaft that is rotated by a servo motor may be screwed into a screw hole provided in the lower portion of the movable carriage and inserted therethrough. The moving distance of the moving carriage is shortened when adjacent bent portions of the pipe are close to each other, and the moving distance is increased when the bent portions are separated.

  The front end stop position of the movable carriage is the front end side of the support base, and the distance from the bending roll mold is relatively short between the front end stop position and 30 cm or less. In this way, when the distance is shortened, bending can be performed at a position close to both ends of the pipe, and the distance from the bending position to the chuck die can be shortened to improve the shape stability of the pipe. it can.

  The bending roll mold and the clamping mold arranged on the front end side of the base are mounted on the upper surface of a bending processing table that is rotatably mounted on the base, and the bending processing table is rotationally driven by a servo motor. The bending roll mold is fixed to one side of the upper surface of the bending table sandwiching the moving axis of the pipe, while the clamping mold is disposed on the opposite side of the bending roll mold with the moving axis of the pipe interposed therebetween and bent by the cylinder. Move to and away from the roll mold, insert both sides of the pipe into the groove provided on the opposing surface of the bending roll mold and the clamping mold, and in this state, rotate the bending table by the required angle and perform bending Yes.

  Also, a pressure die is disposed on the clamping die side and on the front end stop position side, a hydraulic cylinder that moves the pressure die close to and away from the pipe side, and a hydraulic pressure that advances the pressure die according to the rotation of the bending table. By providing a cylinder and fitting the half circumference of the pipe into the groove formed on the tip surface of the pressure mold, the pipe is prevented from protruding outward during bending, and the pipe bending outer periphery is bent in the direction of bending. Pipe breakage is also suppressed by pushing it out.

Further, it is preferable that a foot switch is provided in order to take out the pipe product bent from the bending device after the rear end of the pipe is bent and the movable carriage is moved backward by a required distance.
Specifically, it is preferable that a signal is sent to the cylinder that moves the clamping die backward by the foot switch, the bending roll die and the clamping die are opened, and the bent pipe product can be taken out upward. In this way, when the pipe product is removed by the operator's foot operation, the worker can confirm the product removal timing each time, so the worker can accept the pipe product that has been taken out or the receiving material. It is possible to prevent the processed pipe product from being damaged when taken out.

  The pipe bending apparatus of the present invention is particularly preferably used when a high-voltage cable is inserted inside the pipe. However, the pipe bending apparatus may be a hollow pipe three-dimensional bending apparatus that does not pass a wire or the like inside the pipe. It can be used suitably.

Moreover, the pipe bending method is provided as 2nd invention. The pipe bending method is:
Pierce the high-voltage cable through the pipe,
The pipe is inserted from above between one pair of left and right chuck dies of a mobile carriage equipped with a pipe chuck unit of a pipe bending device,
The pair of left and right chuck molds are moved close together to hold the pipe,
The pipe chuck unit is rotated to rotate the sandwiched pipe by a required angle and the movable carriage is moved to a front end stop position to add a twist to the pipe,
Stop at the front end stop position, project the pipe bending point forward from the front end stop position to the required dimension,
Bending the pipe by rotating the bending roll mold in a state where the bending position of the pipe is sandwiched between the bending roll mold and the clamping mold arranged in front of the required dimension from the front end stop position,
After pinching the pipe between the bending roll mold and the clamping mold, unpinching the pipe by the pair of left and right chuck molds, moving the movable carriage backward by a required distance and stopping,
A pipe bending method is provided, wherein the operation is repeated by holding the pipe with the chuck type after stopping the movable carriage.

Further, when the dimension between the adjacent bending portions of the pipe is longer than the maximum movable dimension of the movable carriage, the pipe is clamped by the chuck mold and moved to the front end stop position, and stopped. The bend roll mold and the clamping mold are used, and the moving carriage is moved backward while the moving carriage is unfastened, and the pipe is held again by the chuck mold at the retreat stop position and moved to the front end stop position. The movement distance of the moving carriage may be subdivided by repeating this operation the required number of times.
Thus, by repeatedly moving the moving carriage, the moving distance of the moving carriage can be shortened, the entire bending apparatus can be miniaturized, the equipment cost can be reduced, and the installation space can be reduced.

  The pipe bending method of the present invention is preferably performed by the pipe bending apparatus described above.

  In the bending apparatus of the present invention, the pipe is moved at the backward stop position where the pipe is sandwiched between the pair of chuck molds of the chuck unit mounted on the movable carriage, or while the pipe is moved from the backward stop position to the front end stop position. Since the twist is applied by rotating, the bending in the three-dimensional direction can be performed at the time of bending performed by rotating the bending roll mold while being sandwiched between the bending roll mold and the clamping mold. The pipe is rotated only by rotating the chuck unit by a required angle with a rotation drive device, and the moving carriage is only reciprocated in a linear direction, so that it is compared with a conventionally used manipulator. Thus, the entire bending apparatus can be easily and miniaturized. Therefore, the operation procedure is simplified, the operator can easily input the operation, and the device can be easily repaired.

  Furthermore, since the pipe is clamped between the bending roll mold and the clamping mold during bending and not clamped by the chuck mold of the chuck unit on the movable carriage, only the movable carriage is associated with the next bending position. What is necessary is just to retreat a required dimension to the clamping position. Also from this point, the entire bending apparatus can be reduced in size, the installation space can be reduced, and the processing time can be shortened to increase the productivity. In addition, holding the pipe with the chuck type of the moving carriage and moving it forward, stopping at the front end stop position, and holding the pipe with the bending roll type and clamping mold, the pipe holding by the chuck type of the moving carriage is solved. Since only the moving carriage can be moved backward, the moving carriage can be reciprocated to subdivide the moving distance of the pipe, the moving distance of the moving carriage can be shortened, and the bending apparatus can be downsized accordingly.

It is a top view of the bending apparatus of this invention. It is a front view of the said bending apparatus. The pipe chuck unit mounted on the movable carriage of the bending apparatus and the rotation mechanism of the pipe chuck unit are shown, (A) is a front view, (B) is a rear view, and (C) is a perspective view of a large-diameter gear. (A) (B) is drawing which shows the state which opened the chuck | zipper type | mold of the said pipe chuck unit, and the closed state which clamps a pipe. It is drawing which shows the state which rotates the pipe chuck unit which clamped the said pipe. (A) is a top view which shows a bending roll type | mold and a clamping die, (B) is a front view. (A) is a front view which shows the state which penetrated the high voltage | pressure cable to the straight tubular pipe before a bending process, (B) is a front view which shows the state after a bending process. (A)-(E) are schematic which shows the process of a bending process. It is explanatory drawing which shows other embodiment. (A) (B) is drawing which shows a prior art example.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the entire configuration of the bending apparatus is provided with a conveyance path 2 a in the length direction on a substantially rectangular upper surface of a base 2 fixed on the floor. The movable carriage 3 mounted on the transport path 2a is advanced in the direction of the arrow X1 and stopped at the front end stop position P1, and is bent on the front end upper surface of the front base 2 at a predetermined distance S1 from the front end stop position P1. The table 7 is rotatably installed, the bending roll mold 4 and the clamping mold 5 are disposed opposite to each other on the upper surface of the bending table 7, and the pressure mold is formed laterally between the bending table 7 and the front end stop position P <b> 1. 6 is arranged.
The movable carriage 3 is stopped by retreating the distance corresponding to the next bending position of the pipe 1 from the front end stop position P1 in the direction of the arrow X2, and the pipe chuck unit 10 (mounted on the movable carriage 3 at the reverse stop position P2 ( Hereinafter, the pipe 1 is chucked by a chuck unit 10), and the pipe 1 is rotated and moved forward to the front end stop position P1 in the chucked state to twist the pipe 1.

  An annular belt 9 is rotatably arranged with the central upper surface of the conveyance path 2a on the base 2 as an opening 2h, and the center of the lower end of the movable carriage 3 is fixed to the annular belt 9 and both sides of the movable carriage 3 are mounted on the base. 2 is slidably mounted on the upper surface. As shown in FIG. 2, both ends of the annular belt 9 are wound around a pulley 19, and one pulley 19 is driven to rotate forward and backward by a required angle by a servo motor 11 so that the movable carriage 3 can move forward and backward by a required distance.

  As shown in FIG. 3, a support frame 3b is projected from the upper surface of one side in the width direction of the lower frame 3a of the movable carriage 3, and a support wall member 30 protruding above the center of the base 2 is provided on the support frame 3b. It is fixed. An arcuate opening 30a having a shape obtained by cutting the upper side is provided at the center of the support wall member 30, and the opening 30a is set to a position corresponding to the clamping position of the pipe 1 of the chuck unit 10. An arc-shaped recess 30e is provided along the inner peripheral edges of both side portions 30b and 30c and the lower side portion 30d surrounding the opening 30a, and the rotation support bearing 31 is freely rotatable with a space in the circumferential direction. The chuck unit 10 can be rotated and supported by a mechanism described later.

  The chuck unit 10 mounted on the movable carriage 3 has an annular large-diameter gear 13 fixed to the rear end surface of the concave chuck support base 12. The large-diameter gear 13 is formed in an annular shape by cutting off the upper portion thereof to form a pipe insertion opening 13h. The pipe insertion opening 13h is aligned with the upper side of the opening 30a of the support wall member 30 so that the pipe 1 is obstructed when the pipe 1 is inserted. The shape does not become. As shown in FIGS. 3B and 3C, the large-diameter gear 13 is provided with a tooth portion 13a on the outer peripheral surface on the rear end side in the axial direction, and the outer peripheral surface on the front end side is a smooth circular arc surface 13b. The arcuate surface 13b is slidably contacted with the plurality of bearings 31 and is rotatably supported. The rear end side of the large-diameter gear protrudes rearward from the opening 30a of the support wall member 30, and, as shown in FIG. 3B, a small-diameter gear 20 that is rotationally driven by a servo motor 21 mounted on the support frame 3b. And the tooth portion 13a of the large-diameter gear 13 are engaged with each other. The servomotor 21 rotates the gear 20 to rotate the large-diameter gear 13 of the chuck unit 10 in a required direction.

  The cylinder main bodies of the hydraulic cylinders 14 and 15 are fixed to the outer surfaces of the left and right frame portions 12a and 12b of the chuck support base 12, respectively, and a pair of left and right chucks are respectively attached to the cylinder rods 14a and 15a protruding from the left and right opposing ends of the cylinder body. Holders 16A and 16B are fixed, and a pair of left and right chuck dies 17A and 17B are fixed to the chuck holders 16A and 16B, respectively. As shown in FIGS. 4A and 4B, semi-circular pipe fitting grooves 18A and 18B having semicircular cross-sections are provided on the opposed tip surfaces of the pair of left and right chuck dies 17A and 17B, and the cylinder rod is extended. When the chuck dies 17A and 17B are closed close to each other, the left and right sides of the pipe 1 are fitted in the grooves 18A and 18B so that the pipe 1 is clamped.

As shown in FIG. 4A, the pipe 1 to be inserted from above is held and held by the pipe receiving member 39 disposed on the upper surface of the movable carriage 3 with the cylinder rods 14a and 15a separated and opened. As shown in FIG. 4B, the pipe 1 can be clamped with a strong force by the chuck dies 17A and 17B driven by the hydraulic cylinders 14 and 15. Further, the pipe 1 is held by the pipe receiving member 39 even when the chuck dies 17A and 17B are opened and the chuck of the pipe is released.
Thus, the entire length of the bending apparatus is shortened so that the pipe 1 is not inserted in the axial direction between the left and right chuck dies 17A and 17B but is inserted from above.
The pipe receiving member 39 is positioned so as to be displaced in the axial direction from the chuck dies 17A and 17B so as not to obstruct the clamping operation by the chuck dies 17A and 17B.
Note that the pipe receiving material 39 may be disposed between the chuck dies 17A and 17B, and the pipe receiving material 39 may be moved up and down.

  As shown by an arrow Z in FIGS. 3 and 5, the chuck molds 17A and 17B for holding the pipe 1, chuck holders 16A and 16B, and the chuck support base 12 for holding the left and right hydraulic cylinders 14 and 15 are watched. In order to rotate in the rotational direction or the counterclockwise direction, the aforementioned large-diameter gear 13 fixed to the chuck support 12 and the gear 20 that is rotationally driven by the servo motor 21 mounted on the support frame 3b are engaged with each other. A rotation drive mechanism is provided.

  As the gear 20 rotates, the meshed large-diameter gear 13 rotates in the Z direction, and the pipe 1 sandwiched via the chuck support base 12, chuck holders 16A and 16B, and chuck dies 17A and 17B serves as a fulcrum for the main axis O. It is made to rotate clockwise or counterclockwise. The rotation may be performed after the movable carriage 3 is chucked with the chuck type at the backward stop position and before the movable carriage 3 is moved forward, or the gear 20 is rotated during the forward movement to advance the pipe 1 forward. It may be rotated while being moved. In any case, a twist is applied to the pipe 1, and the pipe to which this twist is added is bent to realize three-dimensional bending.

  As shown in FIG. 1 and FIG. 2, a relatively short distance S1 of 30 cm or less from the front end stop position P1 of the movable carriage 3 is provided, and the bending roll mold 4 and the clamping mold are formed on the front end upper surface of the base 2 as described above. A bending table 7 having 5 and 5 arranged opposite to each other is rotatably mounted on the base 2. Further, a pressure die 6 is disposed on the fixed base 8 so as to be movable in two axial directions on the side between the bending base 7 and the front end stop position P1.

The bending table 7 is rotationally driven by a bending rotation servomotor 25 mounted on the base 2, and the bending roll die 4 is fixed to one side of the upper surface of the bending table 7 with the movement axis L 1 of the pipe interposed therebetween. On the other hand, the clamping die 5 is disposed on the opposite side of the bending roll die 4 with the moving axis L1 of the pipe interposed therebetween, and is moved close to and away from the bending roll die 4 by the cylinder 26.
As shown in FIG. 6A, the bending roll die 4 has a shape in which a straight guide portion 4b is provided in a part of a horizontally disposed disc 4a, and a semicircular groove on the outer peripheral surface of the straight guide portion 4b. 4c is provided so that the half circumference of the pipe 1 is fitted.
The bending roll mold 4 is positioned on one side of the pipe 1 with the movement axis L1 in between, and the position where the straight guide portion 4b is opposed to and parallel to the movement axis L1 is a bending origin position. After the bending process is completed, the original position is restored.

  As shown in FIGS. 6 (A) and 6 (B), the clamping die 5 is disposed on the other side of the pipe 1 with respect to the movement axis L1 and facing the bending roll die 4. The clamping die 5 and a cylinder 26 having a rod connected to the clamping die 5 are mounted on the bending table 7, and the clamping die 5 is moved toward and away from the pipe by the cylinder 26. A semicircular groove 5a facing the semicircular groove 4c of the bending roll mold 4 is provided on the opposing surface on the front end surface of the clamping die 5. When the half circumference of the bending portion of the pipe 1 is fitted into the groove 4c of the bending roll mold 4, the rod of the cylinder 26 extends to bring the clamping mold 5 close to the bending roll mold 4, and the other half circumference of the pipe 1 is placed in the groove 5a. And the bending portion of the pipe is sandwiched between the bending roll mold 4 and the clamping mold 5. In this state, the bending table 7 is rotated by a required angle by the servo motor 25 so that the pipe 1 is bent.

  As shown in FIG. 1, the pressure die 6 disposed between the clamping die 5 and the front end stop position P1 is a semicircular groove that fits the half circumference of the pipe 1 to the tip surface facing the movement axis L1 of the pipe. 6a. A cylinder 28 having the pressure die 6 fixed to the tip of the rod is placed on the fixed base 8 and on a moving base 29 that moves toward and away from the pipe side. A cylinder 36 for moving the moving table 29 forward and backward is mounted on the fixed table 8. In this way, the cylinders 28 and 36 move the pressure die 6 close to the pipe side during pipe bending, and move it forward in accordance with the progress of pipe bending to move biaxially. The proximity movement of the pressure die 6 toward the pipe is moved in synchronism with the clamping die 5, and the forward movement is synchronized with the rotation of the bending table 7, so that the pipe projects outward when the pipe 1 is bent. Pipe bending is also suppressed by pushing out the pipe bending outer periphery.

  The direction and angle of rotation of the servo motor 11 for pipe feeding, the servo motor 21 for twisting rotation, and the servo motor 25 for rotating the bending table 7 for controlling the moving distance of the moving carriage 3 forward, backward and forward / backward. And the like are sequentially set in advance for each of a plurality of bending portions formed by the entire length of the pipe from the front end to the rear end of the pipe 1. In addition, the operation timings of the hydraulic cylinders 14 and 15 that move the chuck dies 17A and 17B close and away, the clamping die 5 and the cylinders 26, 28, and 36 that move the pressure die are also set in advance, and the pipe 1 is inserted into the bending apparatus. When a start switch (not shown) is turned on, bending is automatically performed at a plurality of bending points set from the front end side to the rear end side of the pipe. Prior to bending, an operator performs input operations sequentially from the bending position on the front end side of the pipe to the bending position on the rear end side for each bending position in a control device (not shown) that automatically controls the servo motor and cylinder drive. It is supposed to be.

  In the automatic bending process, at the end of bending of the bent portion on the rearmost end side of the pipe 1, when the clamping die 5 is automatically separated from the bending roll die 4 to release the pipe 1, the bending processing is finished. Since 1 falls automatically, the foot switch 33 which an operator operates a foot is provided. To remove the pipe product at the end of the bending process, when the foot switch 33 is turned on after the movable carriage is moved to the rear end position, the bending roll mold and the clamping mold are separated to release the pipe, and the pipe product is moved upward. Can be taken out.

Next, a process of bending the pipe 1 penetrating the high-voltage cable 35 with the bending apparatus will be described.
7A and 7B are a plurality of high voltage cables 35 for connecting a battery mounted on a rear floor panel and an inverter mounted in a front engine room in an electric vehicle or a hybrid vehicle. It consists of a cable and penetrates into the pipe 1 made of an aluminum metal or the like in order to route the floor panel below (under the floor) between the rear side and the front side.

  The pipe 1 is a straight pipe that is not bent as shown in FIG. 7A, and is bent by the bending apparatus as shown in FIG. 7B after passing through the high-voltage cable 35. . The bending part of the pipe 1 differs depending on the car to be mounted, but it is bent downward from the side connected to the battery and pulled out through the through hole of the floor panel, and then bent sideways to make the floor under the front. It is necessary to bend to the side and bend upward to the engine room side. The bending is performed at least at two or more and 30 or less, and the bending direction is a three-dimensional direction. Since the bending position of the pipe varies depending on the type of automobile, as described above, the input operation is sequentially performed on the control device for each bending portion before bending.

  As shown in FIG. 8 (A), the bending apparatus places the movable carriage 3 at the initial reverse stop position P2-1 at the initial position before processing, and a pair of chuck types of the chuck unit 10 on the movable carriage 3. 17A and 17B are the open positions shown in FIG. A pipe receiving material that is inserted from above between a pair of chuck dies 17A and 17B in which the pipe 1 penetrating the high-voltage cable 35 is located at the open position of the chuck unit 10 on the movable carriage 3, and is disposed on the movable carriage 3. Take it at 39.

  Next, as shown in FIG. 4B, the hydraulic cylinders 14 and 15 of the chuck unit 10 are driven, the cylinder rods 14a and 15a move in the proximity direction, and the chuck dies 17A and 17B are moved to the closed position. The pipe 1 is clamped and fixed by fitting both side portions of the pipe 1 into the opposing grooves 18A and 18B.

Next, in order to rotate the set angle inputted for each bending portion of the pipe 1, the servo motor 21 for rotating the chuck unit is driven, the gear 20 is rotated, and the large-diameter gear 13 is rotated clockwise or counterclockwise. As shown in FIG. 8B, a required angle is rotated in a required direction.
Next, the feed servomotor 11 for moving the movable carriage 3 is driven, the pulley rotates to move the annular belt 9 forward, and the connected movable carriage 3 is moved forward on the base 2. As shown in FIG. 2, the movable carriage 3 is stopped at the front end stop position P1.
Note that the rotation of the pipe 1 by the servo motor 21 and the forward movement by the servo motor 11 may be performed simultaneously to rotate the pipe 1 while moving forward.
When the movable carriage 3 stops at the front end stop position P1, the front end side bending portion B1 of the pipe 1 protrudes forward from the front end stop position P1 by the set dimension S1, and the pipe 1 enters the groove 4c of the bending roll mold 4 mounted on the front side. The half circumference fits.

  Next, as shown in FIG. 8D, the cylinder 26 that moves the clamping die 5 is driven, the rod is extended to bring the clamping die 5 close to the bending roll die 4 side, and the pipe 1 is placed in the groove 5a. The pipes 1 are clamped between the bending roll mold 4 and the clamping mold 5 by fitting the half circumferences. In synchronism, the cylinder 28 of the pressure die 6 is driven, and its rod extends to the semicircular groove 6a of the pressure die 6 on the opposite side to the half circumference side of the pipe 1 fitted to the bending roll die 4. Fit the half circumference side.

  After the pipe 1 is clamped by the bending roll mold 4 and the clamping mold 5, the bending table 7 is rotated by a required angle by a servo motor 25 for rotation, and the pipe 1 is bent in a required direction. Since the pipe 1 has been rotated by the servomotor 21 in advance by a required angle, the bending process by the bending roll die 4 is bending in a three-dimensional direction. In addition, the pressure die 6 is advanced by the cylinder 36 to follow the bending of the pipe 1 and the bending of the pipe 1 is suppressed.

  During the period in which the pipe 1 is sandwiched and bent by the bending roll mold 4 and the clamping mold 5, the hydraulic cylinders 14 and 15 of the chuck unit 10 are driven to pull the cylinder rods 14a and 15a in the separating direction. The chuck molds 17A and 17B are opened to unpin the pipe 1. Next, the servo motor 11 is driven to rotate the annular belt 9 in the reverse direction, and the movable carriage 3 is moved backward to the required position. As shown in FIG. 8E, the movable carriage 3 is moved to the backward stop position P2-2. Stop at. The reverse stop position P2-2 differs depending on the dimension of the pipe 1 up to the second bending position, and is different from the initial reverse stop position P2-1.

  When the bending process at the bending portion on the front end side of the pipe 1 by the rotation of the bending table 7 is completed, the hydraulic cylinders 14 and 15 of the chuck unit 10 on the movable carriage 3 located at the retreat stop position P2-2. The cylinder rods 14a and 15a are extended to hold the pipe 1 between the chuck dies 17A and 17B. After the clamping, the cylinder 26 of the clamping mold 5 is driven to retract the clamping mold 5 from the bending roll mold 4 so that the clamping of the pipe 1 by the bending roll mold 4 and the clamping mold 5 is released. As a result, the pipe 1 is clamped between the chuck dies 17A and 17B of the chuck unit 10 and the pipe 1 can be fed forward by the moving carriage 3 moving forward. The pressure die 6 also operates the cylinders 28 and 36 to return to the initial position.

The chuck unit 10 is rotated to rotate the pipe 1 by a required angle, and the movable carriage 3 is advanced to the front end stop position P1 to twist the pipe 1, and then the bending roll mold 4 and the clamping mold 5 are used for the pipe. The process of holding and bending 1 is the same as described above.
By repeating the above process for each bending portion of the pipe 1, the pipe 1 is automatically and repeatedly bent at the required bending portion.

  When a plurality of required portions are repeatedly bent and the bending portion on the rearmost end is finished by rotating the bending table 7, the worker pushes the foot switch 33 to retract the clamping die 5 to bend the roll. Unpinching with mold 4 Thereby, since all the clamping by the bending apparatus is cancelled | released, the operator has taken out the pipe 1 after bending upwards.

  As described above, in the bending apparatus of the present invention, the pipe 1 is rotated while moving the pipe 1 from the backward stop position P2 where the chuck unit 10 is clamped or from the backward stop position P2 to the front end stop position P1 where the pipe 1 is bent. Since the twist is added, the bending in the three-dimensional direction can be performed during the bending process in which the bending roll mold 4 is rotated while being sandwiched between the bending roll mold 4 and the fastening mold 5. The pipe 1 is rotated by meshing rotation of a gear for driving the chuck unit 10 mounted on the movable carriage 3 and a large-diameter gear 13 fixed to the chuck support, and the movable carriage 3 is moved in a linear direction. Since it is only reciprocation, the entire bending apparatus can be easily and miniaturized as compared with a manipulator conventionally used.

  Further, since the pipes 1 are clamped by driving the chuck dies 17A and 17B with the hydraulic cylinders 14 and 15 when the pipe 1 is rotated, the clamping force of the pipe 1 can be increased. Therefore, the pipe 1 can be firmly held and rotated and moved.

  Furthermore, since the pipe 1 is sandwiched between the bending roll mold 4 and the clamping mold 5 during bending and is not sandwiched between the chuck dies 17A and 17B on the movable carriage 3, only the movable carriage 3 is subjected to the next bending process. What is necessary is just to make a required dimension retreat corresponding to a position. Also from this point, the entire bending apparatus can be reduced in size, the installation space can be reduced, and the processing time can be shortened to increase the productivity.

  Since the distance between the front end stop position P1 of the movable carriage 3 and the bending roll mold 4 and the clamping mold 5 is shortened, bending is performed even if the bending positions on both ends of the pipe 1 are close to the terminal. Can do. In addition, since the distance from the bending position to the chuck position by the chuck unit on the movable carriage 3 is shortened, the shape stability of the pipe 1 can be achieved.

The bending apparatus of the present invention is not limited to the above embodiment, and the reciprocating means of the moving carriage 3 on the base 2 is a combination of a rack and a pinion, and a timing chain is mounted on the base 2 so as to be freely circulated. The movable carriage 3 may be connected to the chain and moved back and forth.
Furthermore, the rotation mechanism that rotates the pipe 1 while being sandwiched by the chuck unit is not limited to the meshing between the gears, and other rotation mechanisms may be used.

In addition, when bending the pipe by the bending device, when the processing of the bending portion on the front end side of the pipe is completed, the movable carriage is advanced so that the bending portion of the next pipe is positioned between the bending roll mold and the clamping mold. This is repeated until the rear end side. Therefore, if the interval between the bending portions of the pipe is long, it is necessary to increase the forward moving distance of the moving carriage, and accordingly, the length of the base on which the moving carriage is moved becomes longer, and the bending apparatus becomes larger.
However, the length of the base on which the movable carriage 3 travels can be shortened by dividing forward movement by the movable carriage 3 by reciprocating the movable carriage.

FIG. 9 shows a bending method of another embodiment in which the forward movement is subdivided.
When the maximum moving distance ML of the moving carriage 3 traveling on the base 2 is shorter than the distance PM between the adjacent bending portions M1 and M2 of the pipe 1, the moving carriage 3 is moved back and forth to achieve the necessary distance PM. ing.

For example, when PM is 3 times as large as ML (PM = ML × 3), the pipe 1 is clamped by the chuck type of the movable carriage 3 at the rearmost end stop position MP2 on the base 2 and moved to the front end stop position P1. At the front end stop position, the clamping of the pipe 1 is changed to the clamping of the bending roll mold 4 and the clamping mold 5 to release the clamping by the chuck mold. The movable carriage 3 is moved backward to the end stop position MP2, and the pipe 1 is clamped by the chuck type at that position, and the pipe 1 is unpinned by the bending roll mold 4 and the clamping mold 5, and the movable carriage 3 advances the second time. And move to the front end stop position P1. At this position, the holding of the pipe 1 is changed to the holding of the bending roll die 4 and the clamping die 5 in the same manner as in the first time, the holding by the chuck die is released, and the movable carriage 3 is retracted to the end stop position MP2. Next, in the same procedure as described above, the movable carriage 3 is moved forward to the front end stop position P1 by holding the pipe 1 with a chuck type and moving the carriage 3 for the third time.
By the three forward movements of the movable carriage 3, the location of the pipe 1 sandwiched between the bending roll die 4 and the clamping die 5 becomes the next bending location.
Since other steps are the same as those in the above embodiment, the description thereof is omitted.

  As described above, when the interval between the bent portions of the pipe is long, the moving distance of the moving carriage 3 can be shortened and the base can be shortened by performing the forward movement of the moving carriage 3 as many times as necessary, and the bending apparatus can be made compact. There is an advantage that can be realized.

  Furthermore, in the above embodiment, the wire harness passes through the pipe to be bent. However, when bending a pipe used for other applications such as for a fluid passage, the pipe is bent in a hollow state. May be.

DESCRIPTION OF SYMBOLS 1 Pipe 2 Base 3 Moving cart 4 Bending roll type 5 Clamping type 6 Pressure type 7 Bending table 9 Annular belt 10 Pipe chuck unit
DESCRIPTION OF SYMBOLS 11 Servo motor for movement 12 Chuck support stand 13 Large diameter gears 14, 15 Hydraulic cylinder 16A, 16B Chuck holder 17A, 17B Chuck type 18A, 18B Groove 20 Gear 21, 25 Servo motors 26, 28, 36 Cylinder 30 Support wall material 31 Bearing 33 Foot switch P1 Front end stop position P2 (P2-1, P2-2) Reverse stop position

Claims (7)

A pipe chuck unit is mounted on a moving carriage that reciprocates in a linear direction on the base.
The pipe chuck unit includes a chuck support that is rotated by chuck rotating means installed on the movable carriage, a pair of left and right chuck holders mounted on the chuck support, and fixed to the chuck holders, respectively. A pair of chuck dies that are moved in the approaching and separating directions by the driving means and provided with a groove for fitting the half circumference of the pipe on the opposite surface,
Comprising a bending roll mold, a clamping mold and a pressure mold arranged in front of the front end stop position of the movable carriage,
A pair of the chuck dies on the movable carriage holding the pipe inserted from above, rotating the pipe with the chuck rotating means and moving the movable carriage to a front end stop position; A pipe bending apparatus, wherein a pipe is sandwiched between the clamping mold and bent in a three-dimensional direction, and the movable carriage is retracted to a predetermined position during the bending process. As the chuck rotating means of the pipe chuck unit, a servo motor and a gear that is rotationally driven by the servo motor are provided on the movable carriage, and a large-diameter gear that meshes with the outer peripheral surface of one side in the axial direction. The chuck is fixed to the chuck support base, and the upper side of the large-diameter gear is an opening for inserting a pipe, and a ring is provided with a central space through which the pipe sandwiched by the chuck mold is continuously provided, and the opening The outer peripheral surface on the other side in the axial direction of the large-diameter gear is a smooth circular arc surface, and a plurality of bearings that support the circular arc surface of the large-diameter gear at a circumferential interval are provided on the movable carriage. Attached to wall material,
The servo motor rotates the gear to rotate the large-diameter gear, and rotates the pipe through the chuck support base, chuck holder and chuck mold at a required angle with a central axis as a fulcrum, and the rotation of the pipe is the movement It is possible to perform the bending process by rotating the bending roll mold in a three-dimensional direction by twisting the pipe by moving the carriage at the backward stop position, while moving from the reverse stop position to the front end stop position, or at the front end stop position. The pipe bending apparatus according to claim 1.   A hydraulic cylinder is used as a driving means for approaching and separating the pair of chuck dies, the cylinder main body is fixed to the chuck support, and the chuck holder is fixed to the tip of a cylinder rod protruding in an opposing direction from the cylinder main body, The semicircular arc-shaped grooves are provided on the opposite surfaces of the chuck mold, and the pipes are held by the left and right chuck molds by inserting a half circumference of the pipe into the left and right chuck mold grooves, and the left and right chuck molds are The pipe bending apparatus according to claim 1 or 2, wherein the pipe can be inserted from above onto a pipe cradle disposed at a position below the chuck die in a state of being separated.   The pipe bending apparatus according to any one of claims 1 to 3, wherein a distance between a front end stop position of the movable carriage and the bending roll mold is 30 cm or less.   The pipe bending apparatus according to any one of claims 1 to 4, further comprising a foot switch for moving the movable carriage backward by a required distance after the pipe is bent last and taking out the pipe product upward. Penetrate the high-voltage cable through the pipe,
The front end side of the pipe penetrating the high-voltage cable is inserted from above between a pair of left and right chuck dies of a movable carriage equipped with a pipe chuck unit of a bending device,
The pair of left and right chuck molds are moved close together to hold the pipe,
The pipe chuck unit is rotated to rotate the sandwiched pipe by a required angle and the movable carriage is moved to a front end stop position to add a twist to the pipe,
Stop at the front end stop position, project the pipe bending point forward from the front end stop position to the required dimension,
Bending the pipe by rotating the bending roll mold in a state where the bending position of the pipe is sandwiched between the bending roll mold and the clamping mold arranged in front of the required dimension from the front end stop position,
After pinching the pipe between the bending roll mold and the clamping mold, unpinching the pipe by the pair of left and right chuck molds, moving the movable carriage backward by a required distance and stopping,
A pipe bending method, wherein the operation is repeated by holding the pipe with the chuck mold after stopping the movable carriage.   When the dimension between adjacent bending portions of the pipe is longer than the maximum movable dimension of the movable carriage, the pipe is clamped by the chuck type of the movable carriage, moved to a front end stop position, and stopped. The clamping is performed by the bending roll mold and the clamping mold, and the moving carriage is moved backward while the chucking mold of the moving carriage is released, and the pipe is clamped again by the chuck mold at the retracted stop position and moved to the front end stop position. The pipe bending method according to claim 6, wherein the movement distance of the moving carriage is subdivided by repeating this operation a required number of times.

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