KR101672979B1

KR101672979B1 - Thin plate working apparatus and making method

Info

Publication number: KR101672979B1
Application number: KR1020150130380A
Authority: KR
Inventors: 오효근; 이대근
Original assignee: (주)금부치아
Priority date: 2015-09-15
Filing date: 2015-09-15
Publication date: 2016-11-04

Abstract

The present invention relates to a sheet processing apparatus and a sheet processing method. The thin plate machining apparatus according to the present invention includes a die plate 16 having a first pitch hole 18 formed therein, a second pitch hole 20 formed therein, a third pitch hole 22 formed therein A pilot hole punch 38 is provided on the side of the upper die plate 30 corresponding to the first pitch hole 18 and the upper die plate 30 corresponding to the second pitch hole 20 And a blanking punch 44 is provided on the side of the upper die plate 30 corresponding to the third pitch hole 22. [ A first pilot pin 24 passing through at least two of the pilot holes 62 formed in the base material 60 by the pilot hole punch 38 is provided around the second pitch hole 20, The piercing punch 42 may be rotated to rotate the base material 60 by a predetermined angle so that the first pilot pin 24 passes through a specific one of the pilot holes 62, 66) are formed by dividing them a plurality of times. When the thin plate is processed in this manner, the production of the product 70 can be mechanized, so that a relatively large amount of water can be easily produced, and the pattern can be formed more accurately.

Description

[0001] The present invention relates to a thin plate working apparatus and a thin plate working method,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a thin plate processing apparatus and a thin plate processing method, and more particularly, to a thin plate processing apparatus and a thin plate processing method which make a thin metal plate into a product having a predetermined repeat pattern through machining.

Precious metals such as gold are expensive, so it is necessary to get the desired decorative effect as small as possible. That is, when gold is used as a thin plate to be used in jewelry, it is economical to thin the thickness of the thin plate as much as possible.

Therefore, when making jewelry using gold, a thin gold foil is manually processed to produce a desired shape. However, if it is done by hand, mass production is impossible, labor costs are increased, and the price of ornaments becomes higher.

In order to solve this problem, many studies have been carried out to mechanically process the gold foil. However, it is very difficult to machine gold plates using mechanical devices. Particularly, in order to manufacture a product having a plurality of penetration portions in a very small diameter in a gold thin plate, a plurality of punches are adjacent to each other, and it is difficult to manage each punch. That is, the punches can only be made thinner. Since they are located adjacent to each other, there is no space for reinforcing the punches, so that the punches can be easily broken. Further, since the punch holes are formed adjacent to the die portions corresponding to the punches, the strength of the die is weakened and the die is easily broken.

Korean Patent Publication No. 10-2003-0048731 Korean Patent Publication 1995-0006859

SUMMARY OF THE INVENTION An object of the present invention is to solve the conventional problems as described above, and to provide a machine having a repeated pattern on a metal sheet.

Another object of the present invention is to make it possible to maintain the component strength of a mechanical device forming a thin plate product having a repeated pattern relatively high.

Another object of the present invention is to form the perforations at precise positions in forming a thin sheet product having repeated patterns within a predetermined diameter and having a narrow width between the perforations several times in a piercing operation.

According to an aspect of the present invention for achieving the above object, the present invention provides a lower plate having an exhaust hole formed therein, a upper plate provided above the lower plate and relatively lifted and lowered relative to the lower plate, A punch which is provided at a position corresponding to the punch hole on the upper plate and which is seated on the die plate, and a punch which passes through the punch, And a movable stripper which is installed on the plate side so that the base material is brought into close contact with the die plate before the punch and the punch is separated from the base material after the punch is separated from the base material by machining the base material, A first punch hole for forming the first punch hole, And a third punch hole for separating the product from the base material, wherein the punch includes a pilot hole punch provided on a side of the upper plate corresponding to the position of the first punch hole, a second punch hole for forming a through- A punching punch provided on the side of the upper die plate corresponding to the position of the second punch hole and a blanking punch provided on the side of the upper die plate corresponding to the position of the third punch hole, At least two second pilot pins are provided in the vicinity of the third punch hole into which the blanking punch is input and output, and a pilot hole formed by the pilot hole punch is passed through the base material And the piercing punch forms repeated patterns by repeatedly working the penetration portions formed in the base material a plurality of times.

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The area where the first punch hole is formed, the area where the second punch hole is formed, and the area where the third punch hole are formed are all on one die plate, and these areas are sequentially arranged in the direction in which the base material is supplied.

The base material is rotated by a predetermined angle at a position where the piercing punch is located to perform repetitive work for forming a penetration portion. The first pilot pin is positioned through the pilot holes formed in the base material, .

According to another aspect of the present invention, there is provided a method of processing a thin plate, the method comprising: forming a through-hole for forming a repeated pattern on a base metal sheet, the base plate having a plurality of pilot holes A piercing step of passing the first pilot pin through the pilot hole to set the position of the base material and forming a plurality of penetration portions by using a piercing punch for forming repeated patterns; And a blanking step of separating the pattern part from the base material in which the repeated pattern is formed through the piercing step by using a blanking punch, wherein in the piercing step, the first pilot pin is passed through at least two of the plurality of pilot holes A method of setting a position of a base material, the method comprising: rotating the base material by a predetermined angle, Changing the pilot hole which the pin is located and form the through-pierced using a punch.

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In the blanking step, the position of the base material is set by passing the second pilot pin through at least two of the plurality of pilot holes.

The following effects can be obtained in the thin plate processing apparatus and the thin plate processing method according to the present invention.

First, in order to produce a product having a repeated pattern on a metal thin plate, repeated patterns are formed in a plurality of times. In other words, since the pattern of the repeated pattern is confirmed and the perforating portion is formed by piercing work many times, the pattern can be formed. Therefore, the product can be manufactured quickly by the thin plate processing apparatus using the punch and the die.

In the present invention, since the repeated patterns formed on the product are divided into a plurality of circuits, the interval between the punches and the interval between the punch holes formed in the die can be maximized. Therefore, although the cross section of the penetrating portion is small, even if the punch is thin, the gap between the punch and the surrounding punch can be maintained at a certain level or more, so that a structure for reinforcing the punch can be provided. Further, the interval between the punch holes formed in the die corresponding to the punches can be maintained at a predetermined value or more as the interval of the punches, and the strength of the die can be maintained at a predetermined level or more.

In addition, in the present invention, a separate pilot hole is formed outside the region of the base material, and the pilot pin of the mechanical device is passed through the pilot hole, so that the position of the penetration portion formed in the base material is accurately set. Therefore, the accuracy of the final product can be secured.

In the present invention, the piercing punch and the corresponding punch hole are repeatedly used to form repeated patterns, so that the number of piercing punches and the number of punch holes used in the sheet processing apparatus are relatively reduced. As a result, the effect of minimizing the size of the thin plate processing apparatus in the moving direction of the base material can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a sectional view showing a configuration of a preferred embodiment of a thin plate processing apparatus according to the present invention; Fig.
2 is a plan view showing the configuration of a lower mold plate and a die plate constituting an embodiment of the present invention.
FIG. 3 is an operational state view showing a state in which a punch is used to form a base material in a state in which a movable stripper presses a base material in a thin plate processing apparatus according to an embodiment of the present invention.
4 is an operational state view showing a state in which a movable stripper presses a base material in a thin plate processing apparatus according to an embodiment of the present invention.
FIG. 5 is an explanatory view showing a process in which a base material is processed in the embodiment of the present invention. FIG.
6 is an explanatory view showing a process of sequentially rotating a base material while rotating the base material by 90 degrees in the embodiment of the present invention.
FIG. 7 is an explanatory view showing a process of machining a base material while rotating the base material by 72 degrees in the embodiment of the present invention. FIG.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the understanding why the present invention is not intended to be interpreted.

In describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; may be "connected," "coupled," or "connected. &Quot;

Fig. 1 is a schematic cross-sectional view of a configuration of a thin plate processing apparatus according to the present invention. According to this, a plurality of discharge holes 12 are formed in the lower plate 10. The discharge hole 12 is formed at a position corresponding to the punch holes 18, 19, 20, and 22 to be described below, and is a pierced scrap or blanked part where the separated final product 70 is discharged. The lower mold plate 10 is rectangular in plan view, as can be seen in Fig.

The lower plate (10) is provided with a lower stopper (14). The lower stopper 14 cooperates with the phase stopper 32 to be described below to regulate the degree of approach between the lower plate 10 and the upper plate 30 to be described below.

A die plate 16 is provided on the lower mold plate 10. A plurality of punch holes 18, 19, 20, and 22 are formed in the die plate 16. The die plate 16 is integrally formed in this embodiment and has a flat hexagonal shape. The punch holes 18, 19, 20, and 22 will be described. The first punch holes 18 are formed such that a plurality of the punch holes 18 are formed to be approximately circles, as can be seen in Fig. The first punch hole 18 is formed at a position corresponding to an area of the base material 60 outside the portion to be the product 70 when the base material 60 to be described below is located. In this embodiment, there are six of the first punch holes 18. The number of the first punch holes 18 varies depending on the number of piercing operations for forming the penetration portion in the base material 60.

A central punch hole 19 is formed at the center of a virtual circle formed by the first punch hole 18. The central punch hole 19 has the same cross-sectional shape as the penetrating portion 66 formed at the center of the product 70. The central punch hole 19 is not necessarily required. That is, if there is no penetration portion 66 corresponding to the final product 70, the central punch hole 19 is not required.

The second punch hole (20) is formed at a predetermined distance from the first punch hole (18). A plurality of the second punch holes 20 are formed and the shape of the second punch holes 20 corresponds to the shape of the penetrating portion 66 for the repeated pattern formed on the product 70. Here, the second punch hole 20 formed in the die plate 16 of this embodiment corresponds to 1/3 of the pattern formed on the final product 70 shown in Fig. That is, by repeating this pattern three times, a pattern formed on the final product 70 is created. Here, in forming the second punch hole 20, the gap between the second punch holes 20 is designed to be as wide as possible. By forming the second punch hole 20 in the shape corresponding to the repeated pattern, the workpiece 60 having the predetermined pattern is formed by rotating the base material 60 several times.

Next, the third punch hole 22 is formed on the opposite side of the region where the first punch hole 18 is formed with respect to the region where the second punch hole 20 is formed. The third punch hole 22 has the same cross-sectional shape as the outer shape of the final product 70. The blanking punch 44 to be described below enters the third punch hole 22 to separate the final product 70 from the parent material 60. [

Here, the region where the first punch hole 18 and the central punch hole 19 are formed, the region where the second punch hole 20 is formed, and the region where the third punch hole 22 is formed all have one die And these regions are arranged in order in the direction in which the base material 60 is fed.

A first pilot pin 24 is installed at a position outside the area corresponding to the product 70 in the region where the second punch hole 20 is formed. Two of the first pilot pins 24 are installed at intervals of 180 degrees. At least two of the first pilot fits 24 may be installed. The first pilot pin 24 passes through the die plate 16 and protrudes from the upper surface of the die plate 16 by a predetermined length. The first pilot pin 24 sets a position where the base material 60 is fixed. That is, the first pilot pin 24 passes through a specific one of the pilot holes 62 formed in the base material 60, thereby setting the position where the base material 60 is fixed. In this embodiment, the first pilot pin 24 is positioned on the pilot holes 62 spaced 180 degrees apart from the six pilot holes 62, and the base material 60 is divided by 120 degrees three times The piercing operation is performed while rotating.

A second pilot pin 26 is provided at a position outside the area corresponding to the product 70 in the region where the third punch hole 22 is formed. And the second pilot pins 26 are also installed at intervals of 180 degrees. The second pilot pin 26 passes through the die plate 16 and protrudes from the upper surface of the die plate 16 by a predetermined length. The second pilot pin 26 also sets a position where the base material 60 is fixed at the time of blanking work.

A post hole (28) is formed at one side of the lower mold plate (10). The post hole 28 is a portion where the tip of the guide post 54 in the upper plate 30 to be described below is located.

The upper die plate (30) is located above the lower die plate (10). The upper mold plate 30 and the lower mold plate 10 are installed in a driver and moved away from each other through relative motion. For example, the lower mold plate 10 is fixed, and the upper mold plate 30 and the lower mold plate 10 are vertically moved so that the lower mold plate 10 and the upper mold plate 30 are adjacent to each other. Of course, the opposite motion or the lower mold plate 10 and the upper mold plate 30 may simultaneously move.

The top plate (30) is provided with a phase stopper (32). The phase stopper (32) is positioned facing the lower stopper (14). The lower mold plate 10 and the upper mold plate 30 approach the position where the phase stopper 32 contacts the lower stopper 14. [

A punch fixing plate 34 is provided on a surface of the upper mold plate 30 where the lower mold plate 10 is viewed. The punch fastening plate 34 is formed to penetrate and fix various punches 38, 40, 42, and 44 to be described below. A punch backing plate 36 is positioned between the punch fixing plate 34 and the upper plate 30 and punches 38, 40, 42, and 44 are interposed between the punch fixing plate 34 and the punch backing plate 36. 33 are hooked. The punch fixing plate 34 and the punch backing plate 36 are fixed to the upper plate 30.

The punches 38, 40, 42, and 44 will be described one by one. First, the number of pilot punches 38 corresponding to the positions corresponding to the first punch holes 18 is set. In this embodiment, there are six pilot hole punches 38. The pilot hole punch 38 forms a pilot hole 62 in the base material 60. The pilot ball punch 38 penetrates through the punch fastening plate 34 and is inserted through the movable stripper 46, which will be described below.

And a center hole punch 40 is provided so as to correspond to the central punch hole 19. [ The center hole punch 40 is also installed through the punch fixing plate 34 and through the movable stripper 46, which will be described below. The center hole punch 40 forms the center hole 64 of the base material 60. The center hole punch 40 may be omitted if the product 70 does not have the center hole 64.

And a piercing punch 42 is provided so as to correspond to the second punch hole 20. The piercing punch 42 also passes through the punch fastening plate 34 and through the movable stripper 46, which will be described below. Although only one of the piercing punches 42 is shown in FIG. 1, a plurality of piercing punches 42 are actually disposed. That is, as shown in FIG. 2, the number of piercing punches 42 corresponding to the second punch hole 20 is provided. In this embodiment, the piercing punch 42 is used.

The blanking punch 44 is provided on the side of the upper die plate 30 so as to correspond to the third punch hole 22. The blanking punch 44 finally removes the product 70 from the base material 60. The blanking punch 44 also passes through the punch fixing plate 34 and passes through the movable stripper 46. The blanking punch 44 is also supported at its rear end by a punch backing plate 36 located between the top plate 30 and the punching plate 34. Sectional shape of the blanking punch 44 has a shape corresponding to the shape of the final product 70.

On the one surface of the punch fixing plate 34, there is a movable stripper 46 provided on the back surface of the stripper backing plate 47. The stripper backing plate 47 can be seen substantially as a part of the movable stripper 46.

A plurality of punch holes 48 are formed in the movable stripper 46. The punches (38, 40, 42, 44) penetrate the punch through holes (48). Accordingly, the punch holes 48 are formed at positions corresponding to the punches 38, 40, 42, and 44, respectively.

The movable stripper (46) is provided on the side of the upper plate (30). And is hooked so as to be spaced a predetermined distance from the punch fastening plate 34 by a structure that is connected to the upper plate 30 through the punch fastening plate 34 precisely. That is, the upper plate 30 is located at a predetermined distance from the punch fixing plate 34 by the elastic force of the elastic member or by its own weight with respect to the upper plate 30 side. However, when the base material 60 is processed by the punches 38, 40, 42 and 44, the punch fixing plate 34 and the movable stripper 46 (more precisely, Plate 47) by the punch fastening plate 34 without any gap.

The movable stripper 46 has a function of pushing and fixing the base material 50 at the time of processing the base material 50 and a function of punches 38, 40, 42, 44 to come out of the punch holes 18, The base material 50 is pressed so that the base material 50 can not come along with the punches 38, 40, 42,

A first pilot hole 49 is formed in the movable stripper 46 at a position corresponding to the first pilot pin 24. A second pilot hole 49 is formed at a position corresponding to the second pilot pin 26, 50 are formed. The first and second pilot holes 49 and 50 prevent the first pilot pin 24 and the second pilot pin 26 from interfering with the movable stripper 46.

A bushing 52 is installed on one side of the upper plate 30 and a guide post 54 is movably installed on the bushing 52. The guide post 54 allows the upper plate 30 side to move along the correct position with respect to the lower plate 10 side. That is, relative movement between the lower plate 10 side and the upper plate 30 side can be accurately performed.

On the other hand, a pilot hole 62 and a center hole 64 are formed in the base material 60 shown in Fig. 5, and a penetration portion 66 is formed by a piercing punch 42. [ The penetration portion 66 is formed and the desired pattern is completed.

Hereinafter, the processing of the thin plate by the thin plate processing apparatus and the thin plate processing method according to the present invention will be described in detail.

In the present invention, the production of the product 70 by processing the base material 60 will be described. First, the operation of the thin plate processing apparatus of the present invention will be described. The lower mold plate 10 side is fixed and the upper mold plate 30 side is elevated and operated.

In order to process the punches 38, 40, 42, and 44 while the base material 60 is placed on the die plate 16, the top plate 30 must be lowered. 1 shows a state in which the base material 60 can be put on or transported to the die plate 16. When the base material 60 is seated at a predetermined position, ) Side starts to descend.

The movable stripper 46 descends before the punches 38, 40, 42, and 44 on the side of the upper die plate 30 to adhere the base material 60 to the die plate 16. This state is shown in Fig. In this state, the movable stripper 46 is brought into close contact with the die plate 16 and a clearance is formed between the movable stripper 46, more precisely, between the stripper backing plate 47 and the punching plate 34 do.

Next, the upper plate 30 and the punch fastening plate 34 and the punches 38, 40, 42 and 44 are further lowered toward the upper plate 30, more precisely, the punches 38, 40 and 42 44 move through the movable stripper 46 to machine the base material 60. That is, the punches 38, 40, 42, and 44 are inserted into the punch holes 18, 19, 20, and 33 through the base material 60. This is the state of FIG.

By doing so, the workpiece 60 is machined by the punches 38, 40, 42, 44. The scrap or product 70 generated by machining by the punches 38, 40, 42, 44 is discharged through the discharge hole 12. Particularly, the finished product 70 is discharged through the discharge hole 12 communicating with the third punch hole 22 corresponding to the blanking punch 44.

When the punches 38, 40, 42, 44 are machined, the top plate 30 is raised again. The punches (38, 40, 42, 44) rise by the rise of the upper plate (30) side. However, the movable stripper 46 is still in a state in which the base material 60 is in close contact with the die plate 16. This state is shown in Fig.

When the upper side of the upper plate 30 is raised to some extent, the movable stripper 46 also starts to rise together with the structure of hanging the movable stripper 46 on the side of the upper plate 30. When the movable stripper 46 ascends and reaches the state shown in Fig. 1, the next operation is ready.

For reference, in this embodiment, the work is carried out while the workpiece 60 is transferred and rotated by the worker to be placed on the die plate 16. 5 (a) is placed on the die plate 16 at the position where the first punch hole 18 and the central punch hole 19 are formed, and as described above, The plate 30 is lowered and then raised again. Thus, the pilot hole 62 and the center hole 64 are formed in the base material 60 as shown in FIG. 5 (b). As described above, the center hole 64 is not necessarily formed. That is, it is formed only when the final product 70 has the center hole 64 therein.

Next, the base material 60 in the state of FIG. 5 (b) is placed at the position where the second punch hole 20 is formed. At this time, the first pilot pin 24 is inserted into the pilot hole 62. Two first pilot pins 24 are seated to be inserted into two pilot holes 62 formed at intervals of 180 degrees. In this state, when the upper plate 30 side is lowered and raised as described above, the penetration portion 66 is formed in the base material 60 by the piercing punch 42. This state is shown in Fig. 5 (c). The penetration portion 66 formed in Fig. 5 (c) is formed in 1/3 of the whole.

Next, the worker rotates the base material 60 by 120 degrees so that the first pilot pin 24 passes through the corresponding pilot hole 62. In this state, when the upper plate 30 is lowered and raised, the penetration portions 66 are formed as shown in FIG. 5 (d). Since the first pilot pin 24 passes through the pilot hole 62, the base material 60 can be seated in the correct position and the machining by the piercing punch 42 can be performed at the correct position have.

Subsequently, the base material 60 is rotated again by 120 degrees so that the first pilot pin 24 passes through the corresponding pilot hole 62. In this state, when the top plate 30 side is lowered and raised, a penetration portion 66 is formed as shown in Fig. 5 (e). In this state, the penetrating portions 66 are all formed.

Next, the worker separates the base material 60 from the first pilot pin 24, and seats the adjacent second pilot pin 26 so as to penetrate the pilot hole 62. At this time, the pilot hole 62 through which the second pilot pin 26 passes does not need to be specified. This is because the perforations 66 are repeated at predetermined angular intervals and the shape of the final product 70 is a cuboid. When the top plate 30 is lowered and raised in a state where the base material 60 is mounted on the die plate 16, the final product 70 is removed from the base material 60 by the blanking punch 44 And is discharged through the discharge hole 12 separately. The resulting final product 70 is shown in Figure 5 (f).

6 shows a case in which the work by the piercing punch 42 proceeds four times while rotating the base material 60 by 90 degrees. FIG. 7 shows the work by the piercing punch 42 by 72 degrees And the process is performed five times while the base material 60 is rotated.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the scope of the present invention but to limit the scope of the technical idea of the present invention. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

10: Lower mold plate 12: Exhaust hole
14: Lower stopper 16: Die plate
18: First punch ball 19: Central punch ball
20: second punch ball 22: third punch ball
24: first pilot pin 26: second pilot pin
28: Post ball 30: Upper plate
32: phase stopper 34: punch fixing plate
36: Punch backing plate 38: Pilot ball punch
40: center hole punch 42: piercing punch
44: blanking punch 46: movable stripper
47: stripper backing plate 48: punch hole
49, 50: Pilot ball 52: Bushing
54: guide post 60: base material
62: pilot ball 64: center ball
66: penetration 70: product

Claims

A lower plate on which a discharge hole is formed,
A top plate provided above the bottom plate and relatively lifting and lowering relative to the bottom plate,
A die plate provided on the lower mold plate and formed with a punch hole corresponding to the discharge hole,
A punch which is provided at a position corresponding to the punch hole on the upper plate and processes the base material placed on the die plate,
And a movable stripper installed on the upper plate side of the punch so that the base material is brought into close contact with the die plate before the punch and the punch is separated from the base material after the punch is separated from the base material by processing the base material,
The punch hole includes a first punch hole for forming a pilot hole in the base material, a second punch hole for forming a penetration portion constituting repeated patterns on the base material, and a third punch hole for separating the product from the base material The punch includes a pilot hole punch disposed on the side of the upper plate corresponding to the position of the first punch hole, a piercing punch disposed on the side of the upper plate corresponding to the position of the second punch hole, And a blanking punch provided on the side of the upper die plate corresponding to the lower die,
At least two first pilot pins are provided in the periphery of the second punch hole into which the piercing punch is input and output, and at least two second pilot pins are provided around the third punch hole into which the blanking punch is input and output, Guiding an installation position of the base material through a pilot hole formed by the pilot hole punch,
Wherein the piercing punch forms repeated patterns by repeatedly performing a plurality of through-holes formed in the base material.

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The method as claimed in claim 1, wherein the area where the first punch hole is formed, the area where the second punch hole is formed, and the area where the third punch hole is formed are all located on one die plate and these areas are sequentially arranged in the direction in which the base material is supplied Sheet metal working apparatus.

4. The method of claim 1 or 3, wherein the base material is rotated by a predetermined angle at a position where the piercing punch is located to perform repetitive work for forming a penetration portion. The pilot holes formed in the base material, And a pin is inserted and positioned to set the mounting position of the base material.

A thin plate processing method for forming a through-hole for forming repeated patterns on a base metal sheet,
A pilot hole forming step of forming a plurality of pilot holes at a position outside a region where the final product is formed in the base material;
A piercing step of passing the first pilot pin through the pilot hole to set a position of the base material and forming a plurality of penetration portions by using a piercing punch for forming repeated patterns;
And a blanking step of separating the patterned portion from the base material from which the repeated pattern is formed through the piercing step by using a blanking punch,
Wherein the piercing step rotates the base material by a predetermined angle in such a manner that the position of the base material is set by passing the first pilot pin through at least two of the plurality of pilot holes, And forming a piercing portion using a piercing punch.

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6. The method of claim 5, wherein in the blanking step, the position of the base material is set by passing the second pilot pin through at least two of the plurality of pilot holes.