JP2002143932A - Press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the dimensional accuracy of a pedal rod, etc., by bending a rod-like work piece in a three-dimensional shape in one step. SOLUTION: In this press for bending the rod-like work piece in a three- dimensional shape, a movable holder 40 is disposed in an elevating/lowering manner with respect to a fixed holder 20. An upper die 42 and a cam (a first cam 44 or a second cam 46) are provided on the movable holder 40. Further, a lower die 22 and a slide die 26 movable in the approaching/retracting direction to/from the lower die 22 are provided on the fixed holder 20. As the movable holder 40 is lowered, the slide die 26 is held by the cam in contact with the lower die 22, and the upper die 42 is disposed between the lower die 22 and the slide die 26.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press working apparatus for processing a work bent into a three-dimensional shape as seen, for example, in a support rod of an accelerator pedal for an automobile.

[0002]

2. Description of the Related Art A support rod (hereinafter, referred to as a pedal rod) for an accelerator pedal in an automobile is a metal rod having a diameter of about 9 mm which is bent into a three-dimensional shape. That is, the pedal rod is bent into a complicated shape to avoid other equipment or the driver's foot. One end of the pedal rod is formed flat to connect an accelerator cable, and a connection hole is formed therein. At the other end of the pedal rod, a mounting hole for mounting an accelerator pedal is formed.

[0003] The processing of the pedal rod can be roughly classified into three steps: a whole bending step and a processing step at each end. Usually, a press trimming step at one end, a whole bending step, and a bending step at the other end are performed. The drilling process is performed in this order. For the entire bending process, a working method such as a press process or a bender process is adopted, and for the bender process, for example, a technique disclosed in Japanese Patent Application Laid-Open No. 9-150756 is known. In the press working, primary working and secondary working for obtaining a three-dimensional shape are sequentially performed by individual dies. In the bender processing, since the one end of the pedal rod (work) needs to be located at a reference position for bending, the above-described press / trim process is performed before the bender processing.

[0004]

As described above, in press working, since a work is set in several dies in order and bent into a three-dimensional shape, errors (variations) in the dimensions of the pedal rod after working are caused. Easy to occur. The reason is considered to be that it is difficult to accurately set the work in the mold for the secondary processing after the bending by the primary processing. When a workpiece is bent into a three-dimensional shape by bender processing, the work in the press / trim process, which is the reference position for bending as described above, is important. Accuracy is required. Unless this processing accuracy is obtained, the dimensions of the pedal rod cannot be maintained at an appropriate level.

[0005] By the way, even if there is some variation in the dimensions of the pedal rod, in the case of mechanical operating means for transmitting the operation of the accelerator pedal to the throttle by a cable, it is possible to adjust the degree of operation by attaching these to the vehicle to a certain extent. Variations can be absorbed. However, in recent years, instead of the mechanical operating means, an electric operating means which directly detects the amount of movement of the pedal rod accompanying the operation of the accelerator pedal with a position sensor and controls opening and closing of the throttle based on the detection signal is employed. It has become. In this electric operating means, it is an important subject to ensure the dimensional accuracy of the pedal rod.

An object of the present invention is to solve the above-mentioned problem, and an object of the present invention is to enable a rod-shaped work to be bent into a three-dimensional shape in one step and to reset the work to, for example, a press die. Another object of the present invention is to eliminate the need for preparing a reference position with high machining accuracy for a workpiece and to improve the dimensional accuracy of a pedal rod or the like.

[0007]

Means for Solving the Problems The present invention has been made to achieve the above object, and the invention described in claim 1 is a press working apparatus for bending a rod-shaped work into a three-dimensional shape. In addition, the movable holder is arranged to be able to move up and down with respect to the fixed holder. The movable holder is provided with an upper die and a cam. On the other hand, the fixed holder is provided with a lower die and a slide die movable in a direction approaching or separating from the lower die. The slide die is held in contact with the lower die by the cam as the movable holder descends, and the upper die is inserted between the lower die and the slide die.

[0008] According to this configuration, the slide die contacts the lower die based on the lowering operation of the movable holder, and the upper die enters between the lower die and the slide die. It can be bent into a three-dimensional shape in the process. As a result, for example, the dimensional accuracy when processing the pedal rod of the accelerator pedal is improved, and the dimensional accuracy of the pedal rod required when the electric operation means of the throttle is employed can be obtained.

According to a second aspect of the present invention, there is provided the press working apparatus according to the first aspect, wherein the slide die is always urged to return to a predetermined position separated from the lower die. The slide type and the fixed holder are connected by a link mechanism. Further, the movable holder is provided with a first cam which pushes the link mechanism by its lowering operation to move the slide die to a position in contact with the lower die. As described above, by moving the slide die by pushing the link mechanism by the first cam when the movable holder descends, a large movement stroke of the slide die can be secured. Therefore, it is possible to cope with a work requiring a large bending amount.

According to a third aspect of the present invention, there is provided the press working apparatus according to the second aspect, wherein the link mechanism by the first cam is provided when the slide die substantially contacts the lower die. The pressing force is set to be released. The movable holder includes a second cam that comes into contact with the slide mold from the opposite side of the lower mold. In this case, the pressing force on the link mechanism is released by the first cam as described above, so that the slide die can be prevented from being excessively pressed against the lower die, and at the same time, the slide die is By the contact of the second cam, an appropriate mold clamping force is maintained.

According to a fourth aspect of the present invention, there is provided the press working apparatus according to the third aspect, wherein the fixed holder includes a block which is in contact with the second cam on the opposite side of the slide die. ing. Accordingly, the slide clamping force of the second cam can be backed up by the block, and the shortage of the clamping force due to, for example, bending of the second cam can be eliminated.

[0012]

Embodiments of the present invention will be described below. 1 to 3 are explanatory views showing the order in which a workpiece (a material for a pedal rod) is bent into a three-dimensional shape. The work 10 in this case is a metal round bar, which is shown in FIG.
From the straight state as shown by, it is bent as shown in FIG. 2 within the virtually drawn rectangular plane ABCD. Further, the work 10 is bent from the state of FIG. 2 in the plane CDEF of the virtual rectangular parallelepiped as shown in FIG.

FIG. 4 is a perspective view showing both ends of the completed pedal rod. As shown in FIG. 4A, one end 10a of the pedal rod is formed flat to connect an accelerator cable, and has a connection hole 12. Also, as shown in FIG.
b has a mounting hole 14 for mounting an accelerator pedal.
Has been opened.

FIG. 5 is a front view showing a press working device for bending the work 10 into the three-dimensional shape shown in FIG. 3, and FIG. 6 is a plan view showing only the lower side of the press working device. FIGS. 5 and 6 show the mold open state.
This press working device is provided with upper and lower holders 20 and 40 like a general press device, and the upper movable holder 40 moves up and down with respect to the lower fixed holder 20.

On the upper surface of the fixed holder 20, a lower mold 22 is provided.
Is fixed, and a slide die 26 is provided so as to be able to move in a direction approaching or separating from the lower die 22 (left-right direction in the drawing). FIG. 7 shows the lower mold 2
2 is shown in a perspective view, and FIG. 8 shows the slide mold 26 in a perspective view. As is apparent from these drawings, the opposing sides of the lower die 22 and the slide die 26 are formed with processing surfaces 24, 27 for bending the work 10 respectively.
It has become. Also, the back surface of the slide die 26 (the processing surface 27)
On the other side, the coupling portions 28 are integrally formed at two places.

A coupling block 32 is fixed to the upper surface of the fixed holder 20 at two locations corresponding to the two coupling portions 28 of the slide die 26, and these coupling portions 28 and the coupling block 32 are individually linked by a link mechanism. 34. FIG. 9 shows one link mechanism 34 in a perspective view. As is clear from this drawing, the link mechanism 34 is provided with one link member 34 connected to the connecting portion 28.
a and a pair of link members 34 b connected to the coupling block 32. On the upper surface of the fixed holder 20, three blocks 30 are fixed at positions where they can contact the rear surface of the slide die 26.

The slide mold 26 is mounted on the fixed holder 20.
And is urged in a direction away from the lower mold 22, and is in a standby position shown in FIGS. In this standby position, the rear surface of the slide die 26 is in contact with each of the blocks 30, and is restricted so as not to move any further. As the urging means for the slide mold 26, for example, the elasticity of a spring built in the fixed holder 20 is directly applied to the slide mold 26, or a spring force for maintaining the state of FIG. I just need. It is a sub-function that each block 30 receives the slide die 26 at the standby position as described above, and the main function will be described later.

On the lower surface of the movable holder 40, an upper die 42 is fixed at a position corresponding to the lower die 22, and the first cam 44 and the second
The cams 46 are fixed respectively. FIG.
Are shown in perspective view. As is apparent from this drawing, the upper die 42 has a shape conforming to the processing surface 24 of the lower die 22 and the processing surface 27 of the slide die 26, and the lower end surface thereof is used for bending the work 10. Machined surface 43
It has become. As shown in FIG. 6, the first cam 44 is located at two positions corresponding to the two link mechanisms 34,
The cams 46 are located at three positions corresponding to the blocks 30 described above. The lower end of these second cams 46 has a slope 4
8 are formed respectively.

The details of the arrangement of the first cam 44 and the second cam 46 will be described. In the first cam 44, each lower end face is an arc-shaped end face P of the link member 34a of the link mechanism 34 (FIG. 9). The position is set so that it can be contacted. The second cam 46 is positioned so that it can enter the space created between the back surface of the slide mold 26 and each block 30 at the time of mold clamping described below.

Next, the bending of the work 10 by the press working apparatus configured as described above will be described.
First, the work 10 of FIG. 1 is set on a step portion on the processing surface 24 of the lower mold 22 in the mold open state shown in FIGS. Then, when the movable holder 40 is lowered from the position shown in FIG. 5 to the position shown in FIG. 11, first, the lower end of the first cam 44 comes into contact with the end face P of the link member 34a of the link mechanism 34 and pushes down the link mechanism 34. That is, the link mechanism 34 moves the slide mold 26 from the standby position to the lower mold 22 because the joint portion is pushed down by the first cam 44. Therefore, lower mold 2
The work surface 27 of the slide die 26 is almost in contact with the second work surface 24, and the work 10 is bent substantially into the shape shown in FIG.

When the movable holder 40 is further lowered from the state shown in FIG.
Into the space between the rear surface of the block and the block 30. At this time, the second cam 46 first comes into contact with the corner between the rear surface and the upper surface of the slide die 26 and presses the slide die 26 against the lower die 22 by the slope 48 to enter the space. Thereby, the workpiece 10 is completely bent into the shape shown in FIG. 2, and a space having an open upper surface is created between the processing surface 24 of the lower die 22 and the processing surface 27 of the slide die 26.

As described above, the second cam 46 is mounted on the slide mold 2.
Immediately after starting to enter between the back of 6 and the block 30,
The first cam 44 slides through the end face P of the link member 34a,
It enters a space surrounded by the end face P, the pair of link members 34b and the coupling block 32. Therefore the first
The pressing force of the cam 44 on the link mechanism 34 is released, thereby preventing the slide mold 26 from being excessively pressed against the lower mold 22. The upper mold 42 was formed by the lower mold 22 and the processing surfaces 24 and 27 of the slide mold 26 almost in parallel with the second cam 46 entering between the back surface of the slide mold 26 and the block 30. After entering the space, the work 10 is bent into the shape shown in FIG. 3, and the bending of the three-dimensional shape is completed.

FIG. 12 is a front view showing the press working device in the mold-clamped state after the above processing, FIG. 13 is a plan view showing the press working device in the mold-clamped state, and FIG.
FIG. 3 is a cross-sectional view taken along the line aa of FIG. 3. In the mold clamping state shown in these drawings, the slide mold 26 is held in the mold clamping state by the second cam 46, and the second cam 46 is backed up by the block 30 so as not to bend, and the mold is clamped. Avoids lack of power. Thus, the backup of the second cam 46 is the main function of the block 30. However, the second cam 46
If the rigidity of the block 30 is sufficient, the block 30 can be omitted.

With the above-mentioned press working device, the length is 250 m
Using a metal rod having a diameter of 9 mm and a diameter of 9 mm, bending of a three-dimensional shape was performed. As a result, the work 10 is
By only positioning at the stage of setting on the processing surface 24, the dimensional variation of the bending position was within 0.2 mm. This is sufficient to obtain the dimensional accuracy required for processing the pedal rod.

The work 10 that has been subjected to the three-dimensional bending is subjected to a press trim process as shown in FIG.
The processing of the end 10a shown in FIG. 4A and the processing of the end 10b shown in FIG. An outline of these processing means will be briefly described.

First, the end 10a is processed by using a press machine in a press / trim process to flatten the end of the work 10 with a press die and punching out the connection hole 12 with a trim die. The press die and the trim die are positioned so that individual processing is performed based on the bending position of the work 10. As for the processing of the end 10b shown in FIG. 4 (b), the work 10 is set in a press machine in a punching step, and the mounting hole 14 is processed by a punch provided in a punching die, for example, an upper die. The drilling die in this case is also positioned so that drilling is performed based on the bending position of the work 10.

Although the preferred embodiment of the present invention has been described with reference to the drawings, this embodiment can be easily modified or modified without departing from the spirit of the present invention. For example, the link mechanism 34 is employed to increase the movement stroke of the slide die 26. Therefore, when the bending amount of the work 10 shown in FIG. 2 is relatively small and the moving stroke of the slide die 26 can be set small, the link mechanism 34 and the first cam 44 can be eliminated. However, in this case, it is necessary to set the positional relationship between the slide die 26 and the second cam 46 such that the slide die 26 at the standby position moves toward the lower die 22 only by the lowering operation of the second cam 46. is there.

The bending of the work 10 and the processing in the press / trim step and / or the drilling step may be performed simultaneously by the press working apparatus. The work 10 is not cut into a predetermined length in advance, but a continuous material wound in a coil shape is set in a press working device and sequentially bent, and then the press trim process and the punching process are performed. It can also be cut using. Further, the object to be bent is not limited to the pedal rod, but may be any object that bends the rod-shaped work 10 into a three-dimensional shape.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a work before processing.

FIG. 2 is a perspective view of a workpiece on which primary bending has been performed.

FIG. 3 is a perspective view of a workpiece on which secondary bending has been performed.

FIG. 4 is a perspective view showing both end portions of a pedal rod.

FIG. 5 is a front view showing a press working device.

FIG. 6 is a plan view showing only the lower side of the press working device.

FIG. 7 is a perspective view showing a lower mold.

FIG. 8 is a perspective view showing a slide type.

FIG. 9 is a perspective view showing a link mechanism.

FIG. 10 is a perspective view showing a part of an upper mold.

FIG. 11 is a front view showing a press working device during mold clamping.

FIG. 12 is a front view showing a press working device in a mold clamping state.

FIG. 13 is a plan view showing the press working device in a mold-clamped state.

FIG. 14 is a sectional view taken in the direction of arrows aa in FIG. 13;

[Explanation of symbols]

 Reference Signs List 10 work 20 fixed holder 22 lower mold 26 slide mold 40 movable holder 42 upper mold 44 first cam 46 second cam

Claims (4)

[Claims] 1. A press working device for bending a rod-shaped work into a three-dimensional shape, wherein a movable holder is arranged to be able to move up and down with respect to a fixed holder, and an upper die is mounted on the movable holder. And a cam provided on the fixed holder.On the other hand, a lower mold and a slide mold movable in a direction approaching or moving away from the lower mold are provided in the fixed holder. A press working apparatus in which a mold is held in contact with the lower mold, and the upper mold is set to enter between the lower mold and the slide mold. 2. The press working apparatus according to claim 1, wherein the slide die is always urged to return to a predetermined position separated from the lower die, and the slide die and the slide die are urged to return to a predetermined position. A press working apparatus comprising a first cam connected to a fixed holder by a link mechanism, wherein the movable holder pushes the link mechanism by its lowering operation to move the slide die to a position in contact with the lower die. 3. The press working apparatus according to claim 2, wherein a force of pressing the link mechanism by the first cam is released when the slide die substantially contacts the lower die. A press working device which is set and has a second cam in which the movable holder is in contact with the slide die from the opposite side of the lower die. 4. The press working apparatus according to claim 3, wherein the fixed holder includes a block that is in contact with the second cam on the opposite side of the slide die.