JP2000202526A - Bending device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a bending device with one device which can bend without leaving wear marks on a member to be worked and with high dimensional accuracy in a bending work for which multistage bending is required. SOLUTION: This device is provided with a means for moving a stripper 7 and a die 13 to the descent of the punch 5 and knock-out 11 toward a punch 5 and knock-out 11 while holding the distance between the support of bending of the member 1 to be worked in the punch 5 and the support of bending of the member 1 to be worked in the die 13 which is decided in a design value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bending apparatus which is attached to a press or the like and performs bending of a plate-shaped workpiece.

[0002]

2. Description of the Related Art Generally, a bending apparatus having a punch and a die and having a structure in which the punch and the die are moved in a direction in which the punch and the die relatively face each other is widely known. This device is attached to a press machine, and the punch and the die are relatively moved by the operation of the press machine so as to bend the workpiece.

When such an apparatus is used, there is a problem that wear marks remain on the surface of the workpiece. In order to solve this, an apparatus as disclosed in Japanese Patent Application Laid-Open No. 9-276935 has been devised. In the device, one of a pair of tools including a punch and a die has a portion serving as a bending fulcrum of a workpiece, and has a substantially right-angle cross-sectional shape,
The other of the pair of tools has a cross-section in which the distance between the bending fulcrum and the point of action at which the other tool contacts the workpiece is constant during the relative movement of the two tools. Have. Therefore, when this apparatus is used, there is no wear since the point of action does not slide on the surface of the workpiece between the surface of the workpiece and the other tool.

[0004]

However, in the above-described apparatus, when it is desired to process a workpiece into a shape as shown in FIG. 6, the bent shape on the end side of the workpiece is
At least two bending steps are required because it depends on the machining shape of the tool for keeping the distance between the fulcrum and the point of action constant. Therefore, it is necessary to prepare multiple bending equipment instead of one, or if processing is performed with one bending equipment, it is necessary to replace the die and perform multiple bending processing, and to set up for that purpose However, it takes a lot of time.

Accordingly, the present invention provides a bending apparatus which can be performed by a single apparatus without leaving a wear mark on a member to be processed even in a bending processing requiring a multi-step bending as shown in FIG. The purpose is to provide.

[0006]

According to a first aspect of the present invention, there is provided a bending apparatus for bending a workpiece using a punch and a die. And a knockout for holding the workpiece together with the punch, and at the time of bending, the stripper and the die are set at a design value according to the descending of the punch and the knockout. It is characterized in that it moves toward the punch and the knockout while maintaining the distance between the bending fulcrum of the workpiece in the punch and the bending fulcrum of the workpiece in the die.

According to a second aspect of the present invention, in the bending apparatus according to the first aspect, at the time of bending, a workpiece to be processed on the punch determined by a design value in accordance with a drop between the punch and the knockout. The cam mechanism is a means for moving the stripper and the die toward the punch and the knockout while maintaining the distance between the bending fulcrum of the die and the bending fulcrum of the workpiece in the die.

Further, according to the third aspect of the present invention, in the bending apparatus according to the first and second aspects, the thickness is 0.01 to 1 mm.
Is characterized in that the member to be processed can be bent.
Hereinafter, an embodiment of the present invention will be described.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 schematically shows the structure of a bending apparatus according to the present invention (hereinafter referred to as the present apparatus). FIG. 1 shows the cams 14a, 1a for easy understanding of the structure of the present apparatus.
It is the schematic which is drawn notionally focusing on the part of 4b. This device is roughly divided into an upper die and a lower die, and the upper die is composed of a punch holder 2, a backing plate 3, a punch plate 4, a punch 5, a slider 6 (two pieces), and sliders arranged at four corners. It comprises a guide 9 (four pieces), a stripper 7 (two pieces), a guide post 8 (four pieces), a cam 14a (four pieces), and a stripper fixing cam 15 (two pieces). The stripper 7 is supported by the slider 6 via a guide bolt 17a, a spring 18a, and a guide post 8 (in the right side of the figure, the stripper 7 is located at the back of the paper and is not shown). The two sliders 6 are arranged so as to be able to move from right and left toward the punch 5 while being guided by the slider guide 9. 1, the upper end of the stripper fixing cam 15 is supported by the punch plate 4 in a swingable state, and the lower end has a claw shape so as to be able to engage with the stripper 7.

The lower die includes a die holder 10, a backing plate 20, a die 13 (two), a die guide 12
(Two), knockout 11, and cam 14b (two)
It is composed of The two dies 13 are arranged so that they can move from the left and right toward the knockout 11 while being guided by the die guide 12. On the upper knockout side of the die guide 12, cam followers 16 (two) that are in contact with the stripper fixing cams 15 (two) mounted on the upper die are mounted.

Next, a process of bending the workpiece 1 into a predetermined shape using the present apparatus will be described with reference to FIGS. This apparatus is installed on a press (not shown), and the upper die is fixed to a slide portion (not shown) of the press, and the lower die is fixed to a bolster portion (not shown) of the press. FIG.
It also shows the state of the present apparatus when it is at the top dead center position in the vertical stroke of the slide section of the press machine. The workpiece 1 is supplied onto the die 13 in this state. The upper surface of the knockout 11 is set at the same height as the upper surface of the die 13 and is in contact with the workpiece 1.

FIG. 2 shows a state in which the upper die starts to descend together with the slide portion of the press machine, and the apparatus starts bending. The central part of the workpiece 1 is sandwiched and held between the punch 5 and the knockout 11, and both ends are stripper 7 and die 13.
It is held in between. The gap between the punch 5 and the knockout 11 and the gap between the stripper 7 and the die 13 are set to the same size as the thickness of the workpiece 1. Here, the bent part by the punch 5 is P, the bent part by the die 13 is D,
Let L be the distance between P and D.

FIG. 3 shows a state in the middle of the bending process by the present apparatus. When the slide portion of the press machine further descends from the state shown in FIG.
Also continues to descend while holding the workpiece 1. At the same time, the slope of the cam 14b attached to the lower mold comes into contact with the slope of the slider 6 attached to the upper mold, and the slide 6 is pushed toward the center of the paper and slides toward the punch 5 from left and right. As described above, since the stripper 7 is supported by the guide bolt 17a and the guide post 8, the stripper 7 moves from the left and right toward the punch 5 together with the slider 6 while shortening the vertical interval with the slider 6. On the other hand, the slope of the cam 14a attached to the upper mold comes into contact with the slope of the die 13 attached to the lower mold, and a pressing force acts in the center of the paper surface, so that the die 13 slides from the left and right toward the knockout 11. . Workpiece 1
The horizontal movement speed of the stripper 7 and the die 13 holding the both ends of the workpiece 1 is determined by the cams 14a and 14b and the slider 6 that contacts the respective cams. And the design angle of the slope of the die 13 synchronizes with each other.
Can be maintained while keeping the design value constant.

FIG. 4 shows the state of the apparatus at the bottom dead center position in the vertical stroke of the slide portion of the press machine, that is, the state when the bending of the workpiece 1 is completed. At this time, the claw portion of the stripper fixing cam 15 is
Is engaged with the claw portion. FIG. 5 shows a state in which the upper die is being lifted after the completion of the bending process. Knockout 1
Reference numeral 1 is urged by a spring 18d via a guide bolt 17d, and rises while holding the workpiece 1 with the punch 5. The die 13 is opened to the left and right by the force of a spring 18c via a guide bolt 17c provided on the die guide 12. The movement of the stripper 7 is restricted by the stripper fixing cam 15 and the cam 14a, and the stripper 7 ascends while maintaining the positional relationship with the punch 5 when the bending is completed. When the stripper 7 further rises, the cam follower 16 provided on the die guide 12 disengages the stripper fixing cam 15 from engagement.
The biased spring 18a is released, and the guide bolt 17 is released.
a pushes the stripper 7 downward, and the stripper 7 pushes the workpiece 1 downward and separates it from the punch 5. At the same time, the spring 18b urged by the guide bolt 17b incorporated in the slider guide 9 is also released, and the slider 6 opens right and left together with the stripper 7.

In this apparatus, the movement of the slider, stripper, and die to the left and right is performed by a cam mechanism. Since the cam mechanism has a simple structure, it is easy to design the cam mechanism to perform the bending while keeping the distance L constant in synchronization with the lowering of the upper die. Further, even if the vertical speed of the slide portion of the press machine changes, it is not necessary to change the cam mechanism, so that it is easy to cope with changes in processing conditions.

As described above, in the present apparatus, since bending can be performed while the distance L is kept constant, wear marks are not left. Further, since the thickness of the member to be processed is not changed, even if the member to be processed has a mesh shape, it can be processed without changing the mesh shape.

[0017]

As described above, according to the present invention, multi-stage bending can be performed by one apparatus without leaving any wear marks and without changing the thickness of the workpiece, so that the number of processing steps is greatly reduced. There is an effect that the manufacturing time can be reduced to half or less. Moreover, even if the member to be processed is a thin plate material in the form of a foil or a mesh material, there is an effect that the member to be processed can be bent accurately without damaging the member to be processed.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a configuration of a bending apparatus according to the present invention.

FIG. 2 is a schematic view showing a processing start state of the bending apparatus according to the present invention.

FIG. 3 is a schematic diagram showing a state in the middle of bending of the device according to the present invention.

FIG. 4 is a schematic diagram showing a completed bending process of the device according to the present invention.

FIG. 5 is a schematic view illustrating an upper state of an upper mold of the apparatus according to the present invention.

FIG. 6 is a perspective view showing the appearance of a multi-stage bent product.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Workpiece member 2 ... Punch holder 3, 20 ... Backing plate 4 ... Punch plate 5 ... Punch 6 ... Slider 7 ... Stripper 8 ... Guide post 9 ...・ Slider guide 10 ・ ・ ・ Die holder 11 ・ ・ ・ Knockout 12 ・ ・ ・ Die guide 13 ・ ・ ・ Die 14a, 14b ・ ・ ・ Cam 15 ・ ・ ・ Stripper fixing cam 16 ・ ・ ・ Cam follower 17a, 17b, 17c, 17d: Guide bolts 18a, 18b, 18c, 18d: Spring

Claims (3)

[Claims] 1. A bending apparatus using a punch and a die, comprising: a stripper for holding a workpiece together with the die; and a knockout for holding the workpiece together with the punch. The die moves toward the punch and the knockout while keeping the distance between the bending fulcrum of the workpiece in the punch and the bending fulcrum of the workpiece in the die at the design value in accordance with the descent of the punch and the knockout. A bending apparatus characterized by moving. 2. The bending apparatus according to claim 1, wherein
During the bending process, the head moves toward the punch and the knockout while keeping the distance between the bending fulcrum of the workpiece at the punch and the bending fulcrum of the workpiece at the die at the design value in accordance with the descent of the punch and the knockout. Wherein the stripper and the die moving means are cam mechanisms. 3. The bending apparatus according to claim 1, wherein the workpiece has a thickness of 0.01 mm to 1 mm.