JPH05161926A - Method for punching thin sheet member - Google Patents

Abstract

PURPOSE:To remove generated burrs at a return stage and to perform productive punching by returning a part punched at punching stage again to a material made of a thin sheet member at a return stage. CONSTITUTION:A punching stage where material made of a thin sheet member 1 is positioned, the thin sheet member 1 is clamped at the position of the positioned thin sheet member 1 and a part is punched, a return stage where a part punched at the punching stage is returned again to the material made of the thin sheet member 1 and integrated with the material and a punch down stage to separate a material made of the thin sheet member 1 integrated into one body at the return stage from the thin sheet member 1 punched at the punching stage are provided, therefore, an accurate part can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for punching a thin plate member, and more particularly to a method for punching a thin plate member suitable for punching a predetermined part from a strip-shaped thin plate member.

[0002]

2. Description of the Related Art A conventional method for punching a thin plate member has been performed as follows.

For example, as a method of punching parts in progressive feeding, a method of punching in one stroke, a method of half-punching in one stroke, and a method of pulling out in the second stroke, punching excluding partial connection in one stroke There is a method of performing the removal by disconnecting the remaining connection relationship in the second stroke.

[0004]

However, in the method of punching with one stroke, the punching accuracy is poor, and
It cannot be used for the parts that require high precision because the punched parts may warp. Half stroke in 1 stroke,
Although the former problem is rectified in the method of removing with the second stroke, a convex burr is generated on the punching fracture surface, and this burr is removed in another process, or the punching with high precision is performed. It was necessary to maintain the processing conditions so that Furthermore, in the method of performing punching that excludes partial connection relationships with one stroke, and withdrawal that disconnects the remaining connection relationships with the second stroke, a step is generated especially at the joint where the final punching was performed, and it is necessary to prepare separately. It was necessary to remove this step by the finishing process.

Therefore, in order to punch a high-precision part by the conventional punching method for a thin plate member, punching with good productivity is performed when there is a high demand for the product precision or the working process and the appearance quality. I couldn't.

Therefore, the present invention provides a high-precision component by punching a thin plate member with good precision and appearance quality, and
An object of the present invention is to provide a punching method for a thin plate member capable of punching with high productivity.

[0007]

According to the method for punching a thin plate member according to the present invention, a material made of the thin plate member is positioned, and the thin plate member is held at the position of the determined thin plate member to punch the component. The punching step and the parts punched in the punching step are returned to the material made of the thin plate member again,
It comprises a pulling-back step of integrating with the material, and a pulling-out step of separating the material made of the thin plate member integrated in the pulling-out step and the part punched in the punching step.

[0008]

In the present invention, the material consisting of the thin plate member is positioned by the punching step, the thin plate member is held at the position of the positioned thin plate member, the part is punched, and the punching step is performed in the punching step. The punched parts are returned to the material made of the thin plate member again and integrated with the material. Then, the material made of the thin plate member integrated in the removing step and the punched parts are separated.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

1A to 1D and FIG. 2A.
6A to 6C are explanatory views showing a punching step of the punching method for the thin plate member in the embodiment of the present invention. FIG. 3 is an explanatory view showing a cross section of an upper die B and a lower die A used in the punching method for a thin plate member in one embodiment of the present invention.

First, the lower mold A and the upper mold B used at this time
Let's start with.

In FIG. 3, the lower die A comprises a pullback die 2 and a knockout punch 3. The pullback die 2 receives the work 1 and has a knockout punch 3 slidable therein. The withdrawal die 2 corresponds to a cylinder, and the knockout punch 3 corresponds to a piston that slides inside, and the gap between them is set small. The lower die A withdrawal die 2 is firmly fixed, and
The knockout punch 3 that slides in the pullback die 2
Leaving by spring, pulling back and returning die 2 in normal condition
It is set flush with the upper surface of the. Therefore, the knockout punch 3 and the pullback die 2 not shown are
It has a stopper portion which is flush with the upper surface of the pullback die 2, and is positioned by it.

The upper die B comprises a stripper plate 4 and a withdrawal punch 5, and the stripper plate 4 presses the work 1 against the withdrawal die 2 and has the withdrawal punch 5 slidably inside. is doing. The stripper plate 4 corresponds to a cylinder, and the retracting punch 5 corresponds to a piston that slides inside, and the gap between them is set small. The stripper plate 4 of the upper die B is connected to the retraction punch 5 by a spring (not shown), and reciprocates based on the movement range of the retraction punch 5. Further, the pull-out punch 5 is connected to a hydraulic cylinder (not shown) so that it can reciprocate in the stripper plate 4.

The spring force of the knockout punch 3 in this embodiment is 12 to the punching load of the component 10.
A value of about 20% is selected.

In FIGS. 1 and 2, the work 1 is a stamping material for a strip-shaped thin plate member. In the present embodiment, as the work 1, one having a protruding cylinder portion 1a and a positioning hole 1b which are the functional form of the punching component 10 is used.
It is assumed that the sheets are sequentially sent from the left side to the right side in the figure by a carrier machine (not shown).

The knockout punch 3 has a work 1
The recessed portion 3a for accommodating the protruding cylindrical portion 1a and the protruding portion 3b that fits into the positioning hole 1b are formed. A fitting portion 5b for accommodating the protrusion 3b of the knockout punch 3 fitted in the positioning hole 1b of the work 1 is formed in the pull-out punch 5.

Next, the punching method of the thin plate member of this embodiment will be described with reference to FIGS. 1 and 2. As shown in FIG. 1A, when the lower mold A is fixed and the upper mold B is moving upward, the work 1 having the protruding cylinder portion 1a and the positioning holes 1b is moved by a carrier machine (not shown). Sequentially sent from left to right. This movement distance is set in advance at a position where the positioning hole 1b of the work 1 fits into the protrusion 3b of the knockout punch 3.

When the positioning hole 1b of the work 1 is moved to a position where it fits into the protrusion 3b of the knockout punch 3, as shown in FIG.
As shown in (b), the stripper plate 4 and the withdrawal punch 5 of the upper die B are lowered so that the stripper plate 4 holds the work 1 with respect to the withdrawal die 2 and the knockout punch 3 of the lower die A. Press. At this time, the positioning hole 1b of the work 1 is aligned with the protrusion 3 of the knockout punch 3.
The work 1 is fitted to the b, and the work 1 is positioned with respect to the lower die A and the upper die B, and is set at an accurate punching position corresponding to the punching accuracy. Of course, the protruding cylinder portion 1a, which is a functional form of the component of the work 1, is accommodated in the recess 3a of the knockout punch 3. At this time, the pullback punch 5 of the upper die B is in a state of being separated from the work 1.

Next, as shown in FIG. 1 (c), the withdrawal punch 5 of the upper die B is lowered with the work 1 being pressed and held by the stripper plate 4 with the withdrawal die 2 of the lower die A. Then, the work 1 is pressed and held between the knockout punch 3 and the pullback punch 5, and the position of the work 1 pressed and held between the knockout punch 3 and the pullback punch 5 is lowered. That is, the upper mold B stripper plate 4 and the lower mold A
By lowering the position of the work 1 pressed and held between the knockout punch 3 and the pullback punch 5 than the position of the work 1 pressed and held by the pullback die 2 of FIG. Punch the work 1 between and. The gap precision between the pullback die 2 and the pullback punch 5 is set to a predetermined punching precision.

At this time, the component 10 punched out of the work 1 is in the pull-out die 2 while being pressed and held between the knockout punch 3 and the pull-out punch 5.

Next, as shown in FIG. 1 (d), the part 10 punched out of the work 1 in the pull-out die 2 is pressed and held between the knockout punch 3 and the pull-out punch 5. To raise. Then, the component 10 is pressed and held between the knockout punch 3 and the withdrawal punch 5 with respect to the punching hole 1c of the work 1 which is held by the stripper plate 4 of the upper die B and the withdrawal die 2 of the lower die A. The inserted component 10 is pressed and inserted.

This press-insertion is performed by punching holes 1c of the work 1.
On the other hand, it is ideal that the parts 10 pressed and held between the knockout punch 3 and the pull-out punch 5 are flush with each other. It suffices that a coupling relationship with a certain degree of thickness be obtained. Strictly speaking, the thickness of the work 1 is determined by the material of the work 1 and the accuracy of the gap between the pullback die 2 and the pullback punch 5.

Next, the knockout punch 3 and the withdrawal punch 5 are pressed against the punching hole 1c of the work 1 held by the stripper plate 4 of the upper die B and the withdrawal die 2 of the lower die A. After pressing and inserting the held component 10, as shown in FIG. 2A, the pressing of the upper mold B in the direction of the lower mold A is released, and the upper mold B is moved upward to move the lower mold A to the lower mold A. The upper die B is separated from the upper die B, and the work 1 is sequentially delivered from the left direction to the right direction in the figure by a conveyor not shown.

The component 10 inserted into the punching hole 1c of the work 1 is conveyed by a conveyer (not shown) and moves to the upper portion of the pulling die 8 as shown in FIG. 2 (b). This movement distance is a position separated by a position where the positioning hole 1b of the work 1 fits into the protrusion 3b of the knockout punch 3 in advance, or a position that is an integral multiple thereof. A stripper plate 6 that can be pressed to hold the work 1 by the drop-out die 8 is provided on the upper part of the drop-out die 8. The stripper plate 6 is pulled inside and has a punch 7 slidably. The stripper plate 6 presses the work 1 against the withdrawing die 8 and has an internal withdrawal punch 7 slidably. The stripper plate 6 slides on the cylinder and the withdrawing punch 7 slides on the inside. It corresponds to a moving piston.

When the component 10 pressed and held in the punching hole 1c of the work 1 moves to the position of the predetermined withdrawing die 8, the stripper plate 6 and the withdrawing punch 7 are lowered as shown in FIG. 2 (c). Then, the stripper plate 6 pulls it out and presses the work 1 against the die 8 so as to hold it. Then, the stripper plate 6 and the falling die 8
With the work 1 being pressed and held by, the part 10 inserted into the punching hole 1c of the work 1 is removed and the punch 7 is lowered.
The component 10 having a predetermined shape can be punched out.

As described above, according to the punching method of the thin plate member of this embodiment, as shown in FIG. 1B, the material (workpiece 1) made of the thin plate member is positioned, and the thin plate member thus positioned is positioned. At a position, the work 1 is held by using the stripper plate 4 of the upper die B and the pulling back die 2 of the lower die A, and as shown in FIG. 1C, the punching step of punching the component 10 and the punching step. Parts 10 punched from work 1
2 again to the punching hole 1c of the work 1 to integrate with the material (FIG. 1 (d)), and FIG.
As shown in (c), it comprises a withdrawal step of separating the work 1 integrated in the withdrawal step and the component 10 punched from the work 1.

Therefore, the component 1 punched in the punching process
0 is inserted into the work 1 again, and even if burrs are generated on the component 10 punched in the punching step by the pulling back step of integrating with the work 1, the burr is inserted when inserting in the reverse direction. Can be removed. Therefore, it is not necessary to finish the part 10 punched in the punching process in another process to remove burrs, and even if the punching accuracy is not high, the part 10 having high precision can be obtained. it can. That is, it is possible to perform the punching of the highly accurate component 10 by punching the work 1 with high accuracy and appearance quality and without changing the flow of the work 1 with high productivity.

By the way, the work 1 of the above-described embodiment is positioned, and at the position of the thin plate member thus positioned, the work 1 is held by using the stripper plate 4 of the upper mold B and the pull-out die 2 of the lower mold A. Then, as shown in FIG. 1C, in the punching step of punching the component 10, the work 1 can be made of a material made of a thin plate member, and the component 10 can be cut from the material.
Since it is only necessary to punch through, in the punching step when carrying out the present invention, the material made of the thin plate member is positioned,
Hold the thin plate member at the position of the thin plate member determined,
It can be implemented as a process of punching out parts.

In the punching process of the above embodiment, the work 1
As shown in FIG. 1 (d), the punched component 10 is returned to the punching hole 1c of the work 1 again and integrated with the material in the punching-back step of punching In this state, the work piece 1 is held in the opened state, and is further inserted into the punched hole 1c of the work piece 1 in that state. However, the withdrawal step in the case of implementing the present invention can be a step in which the parts punched in the punching step are inserted again into the material made of the thin plate member and integrated with the material. In this kind of unifying withdrawal step, the component 10 can be conveyed to a position where it is separated by inserting it into the punching hole 1c of the work 1. Further, even if burrs are generated during punching of the component 10, the burrs can be removed by moving in the opposite direction to the direction in which the burrs are generated when the component 10 is inserted, so it is not necessary to remove the burrs by another process. By the way, even if burrs are generated, the burrs can be removed so that the appearance is not deteriorated. Therefore, it is not necessary to question the accuracy of the upper mold B and the lower mold A.

Further, in this embodiment, the punched component 10 is held in the punched state and is inserted into the punched hole 1c of the work 1 in that state. Since it can be accurately inserted into the punched hole 1c of the work 1 without performing position control, there is no need to use another control mechanism for integration.

In the process of separating the work 1 and the component 10 punched from the work 1 integrated in the pulling-back process of this embodiment, the size of the punched component 10 is about the same as or less than that of the punched component 10. The punch 7 is used. However, when the present invention is carried out, the material made of the thin plate member integrated in the pulling-back process and the component 10 punched in the punching process are used.
And a step of separating them.

[0032]

As described above, according to the punching method of the thin plate member of the present invention, the material made of the thin plate member is positioned, and the thin plate member is held at the position of the thin plate member thus positioned to punch the part. The punching step, the part punched in the punching step is returned to the material made of the thin plate member again, and the pulling back step of integrating with the material, and the material made of the thin plate member integrated in the pulling back step and the The thin plate member punched in the punching process is separated from the thin plate member.

Therefore, even if burrs are generated in the component punched in the punching process, the component punched in the punching process is returned to the material made of the thin plate member again and the pulling-back process for integrating with the material is performed. , The burr can be removed when inserting in the reverse direction. Therefore, it is not necessary to finish the parts punched in the punching process to remove burrs in other steps, and even if the punching accuracy is not high, it is possible to obtain parts with high precision as punching parts. That is, it is possible to punch a high-precision component by punching a thin plate member with high accuracy and appearance quality and with high productivity.

[Brief description of drawings]

1 (a) to 1 (d) are explanatory views showing a part of a punching process of a punching method for a thin plate member in an embodiment of the present invention.

2 (a) to 2 (c) are explanatory views showing another part of the punching step of the method for punching a thin plate member in one embodiment of the present invention.

FIG. 3 is an explanatory view showing a cross section of an upper die and a lower die used in a punching method for a thin plate member according to an embodiment of the present invention.

[Explanation of symbols]

 A Lower mold B Upper mold 1 Work 2 Pull back die 3 Knockout punch 4 Stripper plate 5 Pull back punch

Claims (1)

[Claims] 1. A punching step of positioning a material made of a thin plate member, holding the thin plate member at the determined position of the thin plate member, and punching a component having a predetermined shape, and punching in the punching process. The parts are again attached to the material made of the thin plate member, and the pullback step of integrating with the material, the material made of the thin plate member integrated in the pullback step, and the part punched in the punching step. A punching method for a thin plate member, which comprises a pulling-out step of separating.