JP4468783B2 - Method and apparatus for bending rod-shaped material - Google Patents

Description

  The present invention relates to a bending method and apparatus for three-dimensionally bending a long bar-shaped material such as a metal pipe or a metal round bar with an arbitrary curvature.

  As an apparatus for bending a long workpiece such as a metal pipe, an apparatus for bending a pipe three-dimensionally is conventionally known in Patent Document 1 below. In this bending apparatus, a pipe transfer unit having a pipe chuck is installed on a base, and two bending heads are arranged at the end of the base, and each bending head holds a pipe. A pressure die for rotation and a bent roll pivotally supported are provided, and a clamp device that rotates while clamping a pipe to the vent roll is provided on the arm.

This twin-head type pipe bending apparatus basically has a structure in which a bending mold and a clamping mold are rotatably arranged, as in a conventional bending apparatus, and a pair of bending apparatuses provided with them. The head is installed on the base with the bending direction as the opposite direction. For this reason, even when bending a plurality of bent portions in each direction and bending the pipe three-dimensionally, basically, as in the conventional case, for each bent portion, between the bending die and the clamping die. In the state where the pipe is held, the bending mold and the clamping mold are rotated to bend, and the other bending head is used to change the bending direction of the pipe.
JP 2001-96312 A

  For this reason, after bending a part of the pipe with one bending head and then bending the pipe three-dimensionally by changing the bending direction of the other part, the bending head is changed. Therefore, there is a problem in that workability is poor because it is necessary to remove the clamp device from the above-mentioned clamp device and transfer it to a clamp device of another bending head. Furthermore, since the bending curvature of the pipe to be bent is determined by the curvature of the groove of the bent roll of the bending head, when changing the bending curvature of the pipe, it is necessary to replace it with a vent roll that matches the curvature. There has been a problem that the bending of the curvature is arbitrarily set and the bending cannot be performed continuously.

  This invention solves the above-mentioned subject, and provides the bending method and apparatus of a rod-shaped material which can bend a rod-shaped material, such as a pipe, in an arbitrary direction continuously with an arbitrary curvature. With the goal.

In order to achieve the above object, the bending method of the rod-shaped material of the present invention includes a feed mechanism that grips the rod-shaped material and sends it in the axial direction, a shaft rotation mechanism that rotates the rod-shaped material around its axis, A clamping mechanism that clamps the vicinity of the processed portion of the rod-shaped material during processing, a fixed mold that holds the processed portion of the rod-shaped material, and a movable mold that is movably disposed opposite to the fixed mold with respect to the processed portion of the rod-shaped material Bending process comprising: a pressing mechanism that repeatedly presses in the direction perpendicular to the axis of the rod-shaped material; and a pressing position adjusting mechanism that adjusts the pressing position of the movable mold of the pressing mechanism by moving it in the axial direction with respect to the reference position of the fixed mold A method of bending a rod-shaped material with an apparatus,
The step of intermittently feeding the rod-shaped material in the axial direction by the feeding mechanism, and the axial position of the rod-shaped material in the movable mold of the press mechanism at a distance l from the reference position of the fixed mold during the feed stop period a way that, the step of adjusting the pressing position of the bar-shaped member by the pressing position adjusting mechanism, a step with respect to the pressing position of the rod-like member movable type press mechanism, which Ru is repeatedly pressing action by adjusting the width of the amplitude S A step of rotating the rod-shaped material around its axis based on the rotation angle R by the shaft rotation mechanism and adjusting the bending direction ,
The rod-shaped member is rotated around its axis based on the rotation angle R by the shaft rotation mechanism to adjust the bending direction, while the movable type amplitude S by the press mechanism and the distance l between the press positions by the press position adjustment mechanism. The rod-shaped material is three-dimensionally bent by repeatedly pressing the movable die against the rod-shaped material by a press mechanism while adjusting the angle.

The bending apparatus according to the present invention also includes a feed mechanism that grips the rod-shaped material and intermittently feeds the rod- shaped material in the axial direction at a feed amount L, and rotates the rod-shaped material around the axis based on the rotation angle R. A shaft turning mechanism for clamping, a clamping mechanism for clamping the vicinity of the processed portion of the rod-shaped material at the time of processing, a fixed mold for holding the processed portion of the rod-shaped material, and a movable mold movably disposed facing the fixed mold , to the processing portion of the rod-like member, the adjustment the width of amplitude S, and a press mechanism for repeatedly pressing action in the axial and vertical rod-like member, a pressing position of the movable die of the press mechanism, the axial direction of the rod-like member moving and has a pressing position adjusting mechanism for adjusting the distance l which pairs to a reference position of the fixed feed amount L, the amplitude S, rotation angle R, and a storage device for storing in advance the data of the distance l, Based on the data read from the storage device, the feed mechanism, shaft turning mechanism, It includes scan mechanism, and a control unit for controlling the pressing position adjusting mechanism, and
Based on each data read from the storage unit of the control unit, the shaft rotation mechanism is controlled to rotate the rod-like material around its axis to adjust the bending direction, while the pressing position adjustment mechanism is controlled to be movable. While adjusting the pressing position of the rod-shaped material by the distance l, the pressing mechanism is controlled to repeatedly press the movable die with an amplitude S against the rod-shaped material, and the rod-shaped material is bent three-dimensionally .

Here, in the bending apparatus, the rod-shaped material is formed in a tubular shape, and the mandrel device for inserting the mandrel into the rod-shaped material is disposed so as to be movable in the axial direction of the rod-shaped material . When the pressing position is adjusted, the mandrel of the mandrel device is moved according to the pressing position adjusting operation of the pressing position adjusting mechanism , and the tip of the mandrel is positioned at the pressing position in the rod-shaped material during the movable pressing operation. be able to.

  When bending the rod-shaped material, the bar-shaped material is repeatedly pressed in the axial direction by the feeding mechanism, and the pressing position of the rod-shaped material is repeatedly pressed while repeatedly pressing the movable die of the press mechanism. At this time, the bending direction of the rod-shaped material is adjusted by rotating the rod-shaped material around its axis by the shaft rotation mechanism, and the bending curvature is adjusted by the movable amplitude (stroke width) and the pressing position adjusting mechanism by the press mechanism. The bar-shaped material is three-dimensionally bent by adjusting the pressing position.

When bending , assuming that the amplitude during the pressing operation of the movable die is S, the distance from the reference position of the fixed die pressed by the movable die is l, and the feed amount during intermittent movement of the rod-like material is L, the rod-like material is The curvature to bend is substantially determined by the amplitude S and the distance l. When the pressing position is the same, the movable type amplitude (extrusion stroke length) S becomes longer as the bending curvature of the rod-shaped material becomes larger, and as it becomes shorter, the bending curvature becomes smaller. On the other hand, when the movable position amplitude is the same, the bending position has a larger bending curvature, and the shorter the distance l of the pressing position, the smaller the bending curvature. However , when the rod-shaped material is a pipe, the greater the movable amplitude S, the easier it is to cause bending damage (breakage) to the pipe, and the shorter the distance l, the easier the bending damage occurs to the pipe.

Therefore, flexural taking into consideration the efficiency of machining, set a larger amplitude S of the movable mold to the extent that does not cause damage to the rod-like member, the distance l to the position to be pressed to set to the minimum value that can bending a bar-like member Can do. Further, the feed amount L during intermittent movement of the rod-shaped material is set to the maximum value within a range in which the rod-shaped material is not bent, and the twisting direction of bending of the rod-shaped material is determined by the rotation angle R by the shaft rotation mechanism. Since it can be set, if a rod-shaped material is bent based on such a rotation angle A, distance l, and amplitude S, a rod-shaped product designed in a complicated three-dimensional bending shape is repeatedly manufactured with accurate dimensional accuracy. Can

Thus , according to the present invention, while the rod-shaped material is intermittently fed in the axial direction by the feeding mechanism, the movable mold is repeatedly pressed to the pressing position of the rod-shaped material by the press mechanism, and the rod-shaped material is moved by the shaft rotating mechanism. The rod-shaped member is rotated around its axis based on the rotation angle R to adjust the bending direction, and the amplitude S of the movable pressing by the pressing mechanism and the distance l of the pressing position by the pressing position adjusting mechanism are adjusted. since for bending a rod-shaped material such as pipes, in any bending direction and any curvature specified by the design, sterically it can be continuously bent to. Therefore, it is possible to efficiently mass-produce a long bent product having a three-dimensional bending shape such as an exost pipe in a designed and accurate shape .

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram schematically showing the basic configuration of the bending apparatus of the present invention. The basic configuration of the present apparatus will be described with reference to FIG. 1. The present apparatus includes a feed mechanism 1 that grips and feeds a rod-shaped member W in an axial direction, and a shaft rotation mechanism that rotates the rod-shaped member W around its axis. 2, a clamp mechanism 3 that clamps the processed portion of the rod-shaped material W at the time of processing, a fixed mold 4 that holds the processed portion of the rod-shaped material W, and a movable mold that is movably disposed facing the fixed mold 4. 5 is a pressing mechanism 6 that repeatedly presses the processed portion of the rod-shaped material W in a direction perpendicular to the axis of the rod-shaped material W, and the pressing position of the movable die 5 of the pressing mechanism 6 is set in the axial direction with respect to the reference position of the fixed mold 4. And a pressing position adjusting mechanism 7 that moves and adjusts.

  A movable table 10 is disposed on the base 8 so as to be movable in the horizontal direction, and a holding tube 11 for holding the rod-shaped material W toward the longitudinal direction of the movable table 10 is rotatable around its axis. A chuck mechanism 9 for gripping the rod-shaped material W is provided at the tip of the holding tube 11. For the chuck mechanism 9, a collet chuck or the like that grips the rod-like material W by the operation of the fluid pressure cylinder is used, and the moving base 10 is movable on a rail laid on the base 8, for example.

  In addition, a rotational drive mechanism that rotationally drives a screw shaft that is rotatably supported along the rail is provided, and the screw shaft is screwed into the threaded portion to be provided at the bottom of the moving base 10. The feed mechanism 1 is constituted by these mechanisms, and when the screw shaft is rotationally driven, the moving base 10 moves on the rail, and the rod-like material W held by the holding tube 11 is sent to the press head side.

  The shaft turning mechanism 2 is configured as a mechanism that rotationally drives the holding tube 11 of the rod-shaped material W by, for example, a motor and a gear mechanism, and rotates the holding tube 11 holding the rod-shaped material W in both directions within a range of 360 degrees around the axis. It is a structure to be moved. A press mechanism 6 including a fixed mold 4 and a movable mold 5 is disposed at the tip portion on the base 8. The fixed die 4 is formed in a shape for receiving and holding the bar-shaped material W from below, and is fixed on the base 8. The movable die 5 can reciprocate in a direction perpendicular to the axis of the bar-shaped material W above the fixed die 4. The movable mold 5 is attached to the movable part of the press mechanism 6 and performs a pressing operation on the rod-shaped material W. As the press mechanism 6, for example, a screw press mechanism that reciprocates a movable mold by rotating a screw shaft can be employed. The pressing mechanism 6 is provided with a pressing position adjusting mechanism 7 that adjusts the axial distance l from the reference position (for example, the center position) of the fixed mold 4 to the pressing position pressed by the movable mold 5. As the pressing position adjusting mechanism 7, a mechanism for moving the movable die 5 in the lateral direction by rotating a screw shaft, for example, can be used.

  The drive unit of the bending apparatus having the above-described configuration, that is, the feed mechanism 1, the shaft rotation mechanism 2, the press mechanism 6, the pressing position adjustment mechanism 7, the clamp mechanism 3, and the chuck mechanism 9 includes a control unit 14 as shown in FIG. Controlled by The control unit 14 includes a microcomputer including a CPU 15, a RAM 16, a ROM 17, and an input / output circuit 19 as a main part. In particular, the storage device 18 such as a hard disk has a rod-shaped member as well as intermittent feed amount L data. As bending data for each unit length (intermittent feed amount L) of the bent portion of W, the stroke length (amplitude S) when pressing the movable mold 5 of the press head, the pressing of the movable mold 5 from the reference position of the fixed mold 4 Data of the distance l to the position and the rotation angle R that determines the twisting (bending) direction of the rod-shaped member W is stored in advance. These data are read from the storage device 18 by the CPU 15 every time the rod-shaped material W is intermittently sent at the feed amount L, and the amplitude S, distance l, and angle R of the movable mold 5 are controlled based on these data. Is done.

  Next, a bending method performed using the bending apparatus having the above configuration will be described. When bending the rod-shaped material W, as shown in FIG. 1, the rod-shaped material W is first inserted into the holding tube 11 of the movable table 10, and the tip of the rod-shaped material W is set on the fixed mold 4. Then, the bar-like material W is gripped by the chuck mechanism 9.

  When the bending process is started, the control unit 14 of the apparatus drives and controls the feed mechanism 1 to feed the moving table 10 by the feed amount L. When the feed is stopped, the clamp mechanism 3 clamps the tip of the rod-like material W. . Then, during this stop period, the CPU 15 of the control unit 14 drives and controls the press mechanism 6 based on the data read from the storage device 18 to repeatedly press the movable mold 5, and the movable mold 5 is the pressing position of the rod-shaped material W. Press repeatedly. During this pressing operation, the pressing stroke length (amplitude S) of the movable mold 5 and the pressing position of the movable mold 5, that is, the distance l from the reference position of the fixed mold 4 to the pressing position of the movable mold 5, It is controlled by the position adjustment mechanism 7.

  On the other hand, with respect to the bending direction of the rod-shaped material W, the rotation angle R is controlled to rotate around the axis by the shaft rotation mechanism 2 during the feeding operation by the feeding mechanism 1. During the feeding operation, the clamping of the clamping mechanism 3 is released, and when the feeding amount L is finished, the clamping by the clamping mechanism 3 is performed again.

  Specifically, for example, each time the feed amount L is set to 5 mm, the number of strokes of the movable mold 5 is set to 5 times / second, and the movable mold 5 is a fixed mold in the rod-shaped material W during the stop period in which the feeding is stopped. A position at a distance l from the reference position is repeatedly pressed with an amplitude S, whereby the pressed portion of the bar W is bent to a curvature determined by the amplitude S and the distance l.

  For each intermittent feed of the bar-shaped material W, the pressing position of the bar-shaped material W (position at a distance 1 from the reference position of the fixed mold) is repeatedly pressed by the stroke of the amplitude S of the movable mold 5 to determine the bending direction. The adjustment of the rotation angle R is performed every intermittent operation, that is, every time the rod-shaped material W is fed by the feed amount L, and the rod-shaped material W is bent into a predetermined three-dimensional shape.

  As described above, the bending curvature of the rod-shaped material W is substantially determined by the amplitude S and the distance l, and the amplitude (extrusion stroke length) S of the movable die 5 increases as the pressing position is the same. The curvature of is large, and the shorter the curvature, the smaller the curvature of bending. On the other hand, when the distance 1 of the pressing position is the same, the bending curvature increases as the length of the movable mold 5 is the same, and the bending curvature decreases as the length becomes shorter. When the rod-shaped material W is a pipe, the pipe is more likely to be bent as the movable type amplitude S is larger, and the pipe is more likely to be bent as the distance l is shorter. For this reason, when considering the efficiency of bending, the movable type amplitude S is set large within a range that does not cause the rod-shaped material to break, but the distance l to the pressing position is the minimum value at which the rod-shaped material W can be bent. Will be set to. Further, the feed amount L at the time of intermittent movement of the rod-shaped material W is set to the maximum value in a range where no folds or the like are generated in the rod-shaped material.

  In this way, while the rod-like material W is intermittently fed in the axial direction by the feed mechanism 1, the movable die 5 is repeatedly pressed to the pressing position of the rod-like material W by the press mechanism 6, and the rod-like material W is caused by the shaft rotation mechanism 2. Is rotated around its axis to adjust the bending direction, the pressing amplitude of the movable mold 5 by the pressing mechanism 6 and the pressing position by the pressing position adjusting mechanism 7 are adjusted, and the rod-shaped material W is bent. The rod-shaped material W can be efficiently bent in an arbitrary direction with an arbitrary curvature and three-dimensionally continuously.

  2-8 has shown the example of the bending apparatus for pipes which bends the pipe P as a rod-shaped material. In this bending apparatus, in order to bend the pipe P, the mandrel 32a is inserted into the pipe P, and the pressing position is such that the tip of the mandrel 32a is always positioned at the pressing position of the movable mold 5 during the pressing operation. This is a structure that moves in the same direction according to the movement of the movable mold 5 in the axial direction by the adjusting mechanism 27.

  As shown in FIGS. 2 and 3, this processing apparatus is basically provided with a movable table 30 on a base 28 so as to be movable in the lateral direction, as in the above-described embodiment. A rail 21a is laid in the lateral direction on the base 28, and a moving table 30 is movably disposed on the rail 21a via an engaging portion. Further, as the feed mechanism 21, a screw shaft 21b is rotatably supported along the rail 21a, and a screw portion 21c is screwed to the screw shaft 21b so as to be provided at the bottom of the moving table 30. The screw shaft 21b is linked to the motor 21d via a chain, a sprocket, etc., and the screw shaft 21b is rotationally driven by the rotation of the motor 21d, and the moving table 30 moves on the rail 21a via the female screw portion 21c.

  A holding tube 31 for holding the pipe P in its longitudinal direction is disposed in the movable table 30 so as to be rotatable around its axis, and a chuck for holding the pipe P at the tip of the holding tube 31. A mechanism 29 is provided. The chuck mechanism 29 is provided with a collet chuck that is gripped by the operation of a fluid pressure cylinder 29a attached to the side of the movable table 30, and the pipe P inserted and set in the holding tube 31 when bending is performed. Grip.

  Furthermore, a shaft turning mechanism 22 is provided at the rear part of the movable table 30, and the shaft turning mechanism 22 is configured to rotationally drive the holding pipe 31 of the pipe P via a sprocket, a chain, and the like by a motor 22a. The holding pipe 31 holding the pipe P is rotated in both directions within a range of 360 degrees around the axis. A press mechanism 26 having a fixed mold 24 and a movable mold 25 is disposed at the tip of the base 28. The fixed die 24 is formed in a shape for receiving and holding the pipe P from below, and is fixed on the base 28. A movable die 25 is reciprocally movable in a direction perpendicular to the axis of the pipe P above the fixed die 24. It is attached to the movable part of the mechanism 26. As the press mechanism 26, a screw press mechanism that reciprocally moves the movable die 25 by rotation of the screw shaft is used. The movable die 25 has a concave portion that holds the pipe P while pressing it, and the concave portion is formed by a curved surface that substantially follows the bending curvature of the pipe P.

  That is, the press mechanism 26 has an elevating plate 26a disposed on the upper portion of the substantially portal frame so as to be movable up and down via a plurality of guide rods 26d, and a screw shaft 26c is screwed onto the elevating plate 26a via a female screw portion. The screw shaft 26c is rotationally driven by a motor 26b, and the lift plate 26a is driven up and down. A pressing position adjusting mechanism 27 that moves the movable die 25 in the axial direction and adjusts its position is attached to the lower part of the elevating plate 26a. The moving plate 27a of the pressing position adjusting mechanism 27 is movable in the lateral direction (the axial direction of the pipe P) via a guide rod 27c attached to the lower side of the elevating plate 26a.

  A screw shaft 27b is rotatably supported at the bottom of the elevating plate 26a along the axial direction, and a screw portion is screwed to the screw shaft 27b so as to be fixed to the upper portion of the moving plate 27a. The movable mold 25 is fixed to the lower part of the moving plate 27a. The screw shaft 27b is rotationally driven by a motor 27d via a chain, a sprocket, etc., whereby the moving plate 27a moves in the axial direction of the pipe P via the female screw portion, and the movable mold 25 below the moving plate 27a. The position in the axial direction is adjusted.

  On the side of the chuck mechanism 29 of the fixed mold 24, a clamp mechanism 23 for clamping the pipe P during bending is disposed. As shown in FIG. 6, the clamp mechanism 23 has a pair of clamp pieces 23a and 23b, and the pipe P is clamped by moving the pair of clamp pieces 23a and 23b up and down by the operation of the fluid pressure cylinder 23c. .

  On the other hand, a mandrel device 32 for inserting a mandrel 32 a into the pipe P is movably disposed on the base 28 at the rear portion of the feed mechanism 21 of the moving table 30. As shown in FIGS. 2 and 4, the mandrel device 32 is disposed on a rail 32b laid on the base 28 so as to be movable along the axial direction of the pipe P. The mandrel 32a is fixed. As shown in FIG. 8, the tip of the mandrel 32a is formed in a spherical shape and reaches the pressing position of the pipe P that is the workpiece. The mandrel device 32 and the moving plate 27a of the pressing position adjusting device 27 are connected by a connecting shaft 32c. When the moving plate 27a moves in the axial direction of the pipe P and the pressing position of the movable die 25 changes, Accordingly, the position of the tip of the mandrel 32a is changed.

  In addition to the screw press mechanism as described above, the press mechanism 26 uses a rack and pinion press mechanism, or a cam type press mechanism that moves up and down a movable plate and a movable mold by rotating a cam. You can also

  The feed mechanism 21, the shaft rotation mechanism 22, the press mechanism 26, the pressing position adjustment mechanism 27, the clamp mechanism 23, and the chuck mechanism 29 having the above-described configuration are controlled by the control unit 14 as shown in FIG. The The control unit 14 includes a microcomputer including a CPU 15, a RAM 16, a ROM 17, and an input / output circuit 19 as a main part. The storage unit 18 such as a hard disk includes data on the intermittent feed amount L as described above. As the bending data for each unit length (intermittent feed amount L) of the bent portion of the pipe P, the stroke length (amplitude S) when the movable die 25 of the press head is pressed, and the movable die 25 from the reference position of the fixed die 24. Data of the distance l to the pressing position and the rotation angle R that determines the twisting (bending) direction of the pipe P is stored in advance.

  Next, the bending process of the pipe P performed using the bending apparatus having the above-described configuration will be described. First, as shown in FIG. 2, the pipe P is inserted into the holding tube 31 of the movable table 30 from the front, and the mandrel. 32 a is inserted into the pipe P, the tip of the pipe P is set on the fixed mold 24, and the pipe P is gripped by the chuck mechanism 29.

  When the bending process is started, the control unit 14 drives and controls the feed mechanism 21 to feed the moving table 30 by the feed amount L, and clamps the tip end portion of the pipe P by the clamp mechanism 23 as the feed is stopped. During this stop period, the CPU 15 of the control unit 14 drives and controls the press mechanism 6 based on the data read from the storage device 18 to repeatedly press the movable mold 25, and the movable mold 25 sets the pressing position of the pipe P. Press repeatedly. During this pressing operation, the pressing stroke length (amplitude S) of the movable mold 25 and the pressing position of the movable mold 25, that is, the distance l from the reference position of the fixed mold 24 to the pressing position of the movable mold 25 as shown in FIG. Is controlled by a press mechanism 26 and a pressing position adjusting mechanism 27.

  On the other hand, the bending angle of the pipe P is controlled to rotate around the axis by the shaft rotating mechanism 22 during the feeding operation by the feeding mechanism 21. During the feeding operation, the clamping of the clamping mechanism 23 is released, and when the feeding of the feeding amount L is finished, the clamping by the clamping mechanism 23 is performed again.

  For example, each time the feed amount L is set to 5 mm, and the number of strokes of the movable mold 25 is set to 5 times / second. During the stop period in which the feed is stopped, the movable mold 25 is separated from the reference position of the fixed mold in the pipe P by a distance l. The position is repeatedly pressed with an amplitude S, whereby the pressed portion of the pipe P is bent to a curvature determined by the amplitude S and the distance l. When the workpiece is a pipe, the pipe is more likely to be bent as the amplitude S of the movable mold 25 is larger, and the pipe is more likely to be bent as the distance l is shorter. For this reason, when considering the efficiency of bending, the movable type amplitude S is set large within a range that does not cause damage to the pipe P, but the distance l to the pressing position is the minimum value at which the pipe P can be bent. Will be set. Further, the feed amount L at the time of intermittent movement of the pipe P is set to the maximum value within a range where no folds or the like occur in the pipe.

  Then, at each intermittent feed of the pipe P, as shown in FIG. 8, the pressing position of the pipe P (position of distance 1 from the reference position of the fixed mold 24) is repeatedly pressed by the stroke of the amplitude S of the movable mold 25, and bent. The rotation angle R for determining the direction is adjusted every intermittent operation, that is, every time the pipe P is fed by the feed amount L, and the pipe P is bent into a predetermined three-dimensional shape.

  In this way, while the pipe P is intermittently fed in the axial direction by the feed mechanism 21, the pressing mechanism 26 repeatedly pushes the movable mold 25 to the pressing position of the pipe P, and the shaft turning mechanism 22 moves the pipe P to its axis. Since the pipe P is bent by adjusting the bending direction by rotating around and adjusting the pressing amplitude of the movable mold 25 by the pressing mechanism 26 and the pressing position by the pressing position adjusting mechanism 27, the pipe P can be arbitrarily formed. Can be bent efficiently with an arbitrary curvature and three-dimensionally in this direction. Moreover, since the mandrel 32a which moves according to the adjustment of the pressing position is inserted into the pressing position of the pipe P, the possibility of crushing the pipe P is further reduced.

  As described above, according to the method and apparatus for bending a rod-shaped material of the present invention, while the rod-shaped material is intermittently fed in the axial direction by the feeding mechanism, the movable mold is repeatedly pressed to the pressing position of the rod-shaped material by the press mechanism. Operate and rotate the rod-like material around its axis by the shaft turning mechanism to adjust the bending direction, adjust the movable pressing amplitude by the pressing mechanism and the pressing position by the pressing position adjusting mechanism, and the rod-like material Can be bent continuously in any direction with any curvature and three-dimensionally, and long processing with a three-dimensional bending shape such as an exhaust pipe. Things can be processed very efficiently.

It is a block diagram which shows basic embodiment of the bending apparatus of this invention. 2 is a front view of a pipe P bending apparatus. FIG. It is a top view of the bending apparatus. It is IV-IV sectional drawing of FIG. FIG. 5 is a VV cross-sectional view of FIG. 2. FIG. 6 is a view taken along arrow VI-VI in FIG. 2. It is a VII-VII arrow line view of FIG. It is explanatory drawing which shows the form of a bending process typically.

Explanation of symbols

1-feed mechanism 2-shaft rotation mechanism 3-clamp mechanism 4-fixed type 5-movable type 6-press mechanism 7-pressing position adjusting mechanism

Claims (3)

A feed mechanism for gripping and feeding the rod-shaped material in the axial direction;
An axis rotation mechanism for rotating the rod-shaped material around its axis;
A clamping mechanism that clamps the vicinity of the processed portion of the rod-shaped material during processing;
A fixed mold for holding the processed portion of the rod-shaped material;
A pressing mechanism that repeatedly presses the movable mold movably disposed facing the fixed mold in a direction perpendicular to the axis of the rod-shaped material against the processed portion of the rod-shaped material;
A pressing position adjusting mechanism for adjusting the pressing position of the movable mold of the pressing mechanism by moving it in the axial direction with respect to the reference position of the fixed mold;
A method of bending a rod-shaped material by a bending apparatus equipped with
A step of sending to intermittently axial direction by a rod-shaped member wherein the feed mechanism,
During the feed stop period, the bar-shaped member is moved by the pressing position adjusting mechanism so that the axial position of the bar-shaped member in the movable mold of the press mechanism is set at a distance l from the reference position of the fixed mold. Adjusting the pressing position of
To the pressing position of the rod-shaped member of the movable type of the press mechanism, comprising the steps of repeatedly Ru is pressing action by adjusting the width of the amplitude S,
Adjusting the bending direction by rotating the rod-shaped member around the axis based on the rotation angle R by the shaft rotation mechanism;
And adjusting the bending direction by rotating the rod-shaped member around the axis based on the rotation angle R by the shaft rotation mechanism, and the pressing position and the amplitude S of the movable type and the pressing position Bending of a rod-shaped material characterized in that the rod-shaped material is bent three-dimensionally by repeatedly pressing the movable mold against the rod-shaped material by the press mechanism while adjusting the distance l of the pressing position by the adjusting mechanism. Method. A feed mechanism for gripping the rod-shaped material and intermittently feeding the rod- shaped material in the axial direction at a feed amount L ;
A shaft turning mechanism for turning the rod-like material around its axis based on a turning angle R ;
A clamping mechanism that clamps the vicinity of the processed portion of the rod-shaped material during processing;
A fixed mold for holding the processed portion of the rod-shaped material;
Press for repeatedly pressing the movable mold, which is movably disposed facing the fixed mold, with respect to the processed portion of the rod-shaped material in the direction perpendicular to the axis of the rod-shaped material with the adjusted amplitude S. Mechanism,
The pressing position of the movable die of the press mechanism, by moving in the axial direction of the rod-shaped member, and a pressing position adjusting mechanism for adjusting the distance l which pairs to a reference position of the solid fixed,
A storage device that stores in advance each data of the feed amount L, amplitude S, rotation angle R, and distance l, and based on the data read from the storage device, the feed mechanism, the shaft rotation mechanism, A control unit for controlling the pressing mechanism and the pressing position adjusting mechanism;
Equipped with a,
On the basis of each data read from the storage device of the control unit, the shaft rotation mechanism is controlled to rotate the rod-like material around its axis to adjust the bending direction, while the pressing position adjustment mechanism is While controlling and adjusting the pressing position of the rod-shaped material by the movable mold to the distance l, the pressing mechanism is controlled to repeatedly press the movable mold with the amplitude S against the rod-shaped material. An apparatus for bending a rod-shaped material, characterized by three-dimensional bending . The rod-shaped material is formed in a tubular shape, and a mandrel device for inserting a mandrel into the rod-shaped material is disposed so as to be movable in the axial direction of the rod-shaped material, and when the pressing position adjusting mechanism adjusts the movable pressing position. The mandrel of the mandrel device is moved according to the pressing position adjusting operation of the pressing position adjusting mechanism , and the tip of the mandrel is positioned at the pressing position in the rod-shaped material during the pressing operation of the movable type. The apparatus for bending a rod-shaped material according to claim 2.

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