Die used for press working, press working apparatus, method for manufacturing die, and method for manufacturing metal plate

Abstract

To highly accurately manufacture an extremely thin metal plate with a very complex ultra-fine shape without causing deformation or occurrence of burrs.SOLUTION: A method of manufacturing a metal plate includes the steps of: machining a contour of a first die member 1 which will serve as a punch 11 and a knockout 12, into a shape of the punch 11; machining a contour of a second die member 2, which will serve as a die 14 and a stripper 13, into a shape of the die 14 such that a clearance 3 between the die and the punch 11 is 3 μm to 5 μm; and, in a state where the first die member 1 and the second die member 2 are engaged with each other, simultaneously cutting the respective members into two pieces in a plane orthogonal to the engaging direction, thereby simultaneously manufacturing the punch 11 and the knockout 12 whose cut surfaces are in a plane-symmetrical shape and the cut surfaces each serve as a contact surface with the metal plate during shearing of the metal plate and the die 14 and the stripper 13 whose cutting surface is in a plane-symmetrical shape and the cut surfaces each serve as a contact surface with the metal plate during shearing of the metal plate.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a mold used for press working, a press working apparatus, a method for manufacturing a mold, and a method for manufacturing a metal plate. More specifically, the present invention relates to a mold used for press working, a press working apparatus, a method for manufacturing a mold, and a method for manufacturing a metal plate when manufacturing an extremely thin metal plate having a very complicated ultra-fine shape exemplified by a VCM spring.

Background Art

[0002] A VCM (Voice Coil Motor) spring, which is a leaf spring incorporated into an electronic device for functions such as shake correction of a camera for a smartphone, etc., is required to be an extremely thin metal plate having a very complicated ultra-fine shape due to its characteristics.

[0003] As methods for manufacturing such a precision metal plate, (1) press working, (2) photoetching, (3) wire cut electrical discharge machining, etc. can be considered. (1) Press working is a processing technique in which a metal material or the like is pressed with a mold and physically formed into a desired shape by shearing or punching. (2) Photoetching is a processing technique in which a metal material or the like is chemically etched to remove parts other than those covered with a photomask to form a desired shape. (3) Wire cut electrical discharge machining is a processing technique in which a very thin wire is discharged in a liquid, and the heat generated melts the metal material or the like in the liquid to form a desired shape. All of these are well-known techniques that do not require citation of references.

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, under the increasing demand for higher precision year by year, (1) in press working, the influence of metal deformation and burr generation during metal shearing and punching cannot be ignored, and (2) in photoetching processing, it is undeniable that the cross-section has a rounded shape. Therefore, as the precision increases, there is a concern about the accuracy. In addition, compared with press working, it requires space and time for manufacturing, so it is not suitable for mass production. (3) In wire cut electrical discharge machining, the thickness and movement of the wire cannot be ignored. Therefore, as the precision increases, there is a concern about the accuracy. In addition, since the wire is moved one by one along a very complex and fine shape, the manufacturing efficiency is much worse than that of press working and it is not suitable for mass production. Especially when manufacturing an extremely thin metal plate with a very complex ultra-fine shape (an extremely fine meandering shape with deep indentations), due to the thickness of the wire, the wire cannot be moved along the ultra-fine shape, and in some cases, processing is impossible.

[0005] As a result of intensive research on the above problems, the present inventor has found a solution by improving the mold for press working of the conventional fine blanking method. The present invention is for manufacturing an extremely thin metal plate having a very complex ultra-fine shape and a thickness of 50 μm or less, and also provides a mold for press working, a press working apparatus, and a method for manufacturing the mold, which can minimize the generation of metal deformation and burrs for manufacturing such a metal plate. It should be noted that the remarkable improvement in the accuracy of wire cut in recent years has led to the realization of the present invention.

Means for Solving the Problems

[0006] The manufacturing method of a mold used for shearing an ultra-thin metal plate with a thickness of 50 μm or less by press working based on the fine blanking method of the present invention includes a step of processing the contour of a first mold member that will later become a punch and a knockout into the shape of the punch, and a step of processing the contour of a second mold member that will later become a die and a stripper into the shape of a die with a clearance of 3 μm to 5 μm from the punch. Then, the first mold member and the second mold member are simultaneously cut into two pieces each in a plane perpendicular to the meshing direction while in a meshed state, so that the cutting surface has a plane-symmetrical shape, and the cutting surface becomes the contact surface with the metal plate when shearing the metal plate. The method has a step of manufacturing a punch and a knockout, and a die and a stripper, wherein the cutting surfaces have a plane-symmetrical shape and the cutting surfaces become the contact surfaces with the metal plate when shearing the metal plate.

[0007] Further, the mold used for shearing an ultra-thin metal plate with a thickness of 50 μm or less by press working based on the fine blanking method of the present invention has a punch and a knockout that contact the metal plate from above and below in the Z direction so that the contact surfaces have the same X-Y plane coordinates when shearing the metal plate existing in the X-Y plane defined by the X, Y, and Z axes that are perpendicular to each other, and a die and a stripper that contact the metal plate from above and below in the Z direction so that the contact surfaces have the same X-Y plane coordinates. The clearance between the punch and the die is 3 μm to 5 μm.

[0008] Further, the press working apparatus based on the fine blanking method of the present invention includes a holder for attaching the punch and the die, and the knockout and the stripper to the press working apparatus so that when shearing the metal plate, the above-mentioned punch and die, and the knockout and stripper contact the metal plate in a state where the clearance between the punch and the die is 3 μm to 5 μm and apply pressure in the shearing direction.

[0009] In addition, the method for manufacturing an extremely thin metal plate with a thickness of 50 μm or less and having an ultra-fine shape by press working based on the fine blanking method of the present invention is carried out in a three-dimensional space defined by X, Y, and Z axes that are perpendicular to each other. A punch and a knockout that contact the metal plate from above and below in the Z direction so that the contact surfaces have the same X-Y plane coordinates, and a die and a stripper that contact the metal plate from above and below in the Z direction so that the contact surfaces have the same X-Y plane coordinates. It has a step of shearing the metal plate existing in the X-Y plane by contacting and pressing the metal plate in a state where the clearance between the punch and the die is 3 μm to 5 μm. The scrap generated during shearing does not move in the Z direction and is held at the shearing position of the metal plate, and is removed in a later step.

Effects of the Invention

[0010] According to the mold, press working apparatus, mold manufacturing method, and metal plate manufacturing method of the present invention, it is possible to manufacture an extremely thin metal plate having a very complicated ultra-fine shape (an extremely fine and recessed meandering shape) that was technically impossible with conventional press working. In addition, since push-back is suppressed to an extremely minimum level, the frequency of blade grinding of the upper and lower blades of the punch and the die can be greatly reduced, and cost reduction can be achieved. Furthermore, the manufacturing time can be shortened compared to conventional alternative means such as photoetching and wire cut electrical discharge machining, the apparatus can be made more space-saving, and mass production can be carried out much more advantageously. These effects of the present invention will be described in detail in the "Mode for Carrying Out the Invention".

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

[0012] The mold, press working apparatus, manufacturing method of the mold, and manufacturing method of the metal plate according to an embodiment of the present invention will be described in detail mainly with reference to FIGS. 1 and 2, but the present invention is not limited to this embodiment.

[0013] Hereinafter, for convenience of explanation, in a three-dimensional space defined by X, Y, and Z axes that are perpendicular to each other, the extending direction of the metal plate on the X-Y plane is defined as the Y direction, and the direction in which the cutting edge of the punch or the like operates in the shearing of the metal plate is defined as the Z direction. Also, for convenience of explanation, there are parts where the scale in the figures is greatly changed.

[0014] [Manufacturing Method of Mold and Mold] The following processing steps are performed simultaneously (see FIG. 1(1)). (A) The contour of the first mold member 1 with a thickness in the Z direction of 30 mm is processed into a punch with a desired shape by wire cut electrical discharge machining and up-grinding. After this processing, the first mold member 1 is cut into two in the X-Y plane (line A-A) in a subsequent process to form a punch 11 and a knockout 12 having a plane-symmetric cut surface. (B) The contour of the second mold member 2 with a thickness in the Z direction of 30 mm is processed into a die with a desired shape corresponding to the above punch, and with a clearance 3 of 3 μm to 5 μm from the above punch, by wire cut electrical discharge machining and up-grinding. After this processing, the second mold member 2 is cut into two in the X-Y plane (line A-A) in a subsequent process to form a die 14 and a stripper 13 having a plane-symmetric cut surface. (C) Confirm that the first mold member 1 processed into a punch and the second mold member 2 processed into a die mesh with a clearance 3 of 3 μm to 5 μm. Note that since the present invention is a mold for manufacturing an extremely thin metal plate having a very complex ultra-fine shape (an extremely fine meandering shape with recesses), the processing steps in (A) and (B) cannot rely on profile grinding.

[0015] Next, with the first mold member 1 and the second mold member 2 meshed together, at a position 15 mm from the end in the Z direction of both members, simultaneously cut each of them into two in the X-Y plane (line A-A) perpendicular to the Z direction which is the meshing direction (see Fig. 1(1)). In this way, a mold 10 is manufactured, which consists of a punch 11 and a knockout 12 having a clearance 3 of 3 μm to 5 μm and plane-symmetric cut surfaces facing each other in the X-Y plane, and a stripper 13 and a die 14 having plane-symmetric cut surfaces facing each other in the X-Y plane (see Fig. 1(2)).

[0016] The punch, die, etc. according to the present invention use a simplified cross-sectional view for the explanation of the concept of the present invention in FIG. 1, but actually have a very complicated and delicate structure as exemplified in FIG. 6 and the like. Therefore, the punch, knockout, stripper, and die of the present invention are each very slender and extremely weak in strength. However, when they are combined, by setting the clearance to 3 μm to 5 μm, even the pressure and shearing force applied by the press in the Z direction during the shearing of the metal plate described later do not cause any extra space (escape space for force) that leads to deformation such as misalignment and distortion of the mold (which in turn leads to deformation of the metal plate), and the ultra-precise shearing operation is not hindered. Furthermore, according to the present invention, such a mold with a very complicated structure can be manufactured while checking the meshing of the mold members with each other.

[0017] [Press working apparatus] When the mold 10 composed of the above-mentioned punch 11, knockout 12, stripper 13, and die 14 are opposed to each other, a holder (not shown) for attaching the punch 11 and die 14, and the knockout 12 and stripper 13 is provided in a press working apparatus (not shown) so that the clearance 3 between the punch 11 and die 14 is in a state of 3 μm to 5 μm and contacts the metal plate M and applies pressure in the shearing direction.

[0018] Specifically, the holder includes a mechanism that holds the punch 11 and stripper 13 and interlocks with the slide of the press machine according to the fine blanking method, and a mechanism that holds the die 14 and knockout 12 and attaches them while maintaining rigidity to the press machine. Furthermore, various components for adjustment necessary for the press operation of the punch 11, die 14, etc. and for positioning the metal plate M are provided in the press working apparatus, but since all of them are common general knowledge, they are not shown or described.

[0019] [Method for manufacturing an ultra-thin metal plate having an ultra-fine shape] Using the press working apparatus provided with the above-mentioned mold 10, it is carried out by the following steps. (1) A metal plate M with a thickness of 50 μm or less, which is a copper alloy coil material (hoop material), is flattened through an uncoiler, a leveler, etc., and reaches the press position 15 on the X-Y plane of the press working device (press direction: Z) by a material feeding device (feeding direction: Y) (see Fig. 2(1)). At this time, at the press position 15, a punch 11 and a knockout 12 having a cut surface with the above-described plane-symmetrical shape face each other in the Z direction, and further, a stripper 13 and a die 14 having a cut surface with the above-described plane-symmetrical shape face each other in the Z direction, and the clearance between the punch 11 and the die 14 is 3 μm to 5 μm (see the same figure). These cut surfaces are contact surfaces that simultaneously contact the metal plate M when the metal plate M is sheared. (2) The stripper 13 and the die 14 contact the metal plate M from above and below in the Z direction, fix the metal plate M at the press position 15 on the X-Y plane, and simultaneously fix it also in the Z direction. That is, the stripper 13 serves as a pad (see Fig. 2(2)). Further, the knockout 12 contacts the metal plate M from below in the Z direction, and further fixes the metal plate M in the downward direction of the Z direction. That is, the knockout 12 serves as a pad when the metal plate M is sheared (see the same figure). (3) The punch 11 descends from above in the Z direction with respect to the metal plate M on the X-Y plane at the press position 15 by the slide operation of the press working device (see Fig. 2(3)). (4) When the descending punch 11 contacts the metal plate M, the metal plate M on the X-Y plane is sandwiched and fixed between the punch 11 from above in the Z direction, the stripper 13 (pad), the knockout 12 (pad) from below in the Z direction, and the die 14, and a shearing force by the upper blade of the punch 11 and the lower blade of the die 14 acts on the metal plate M to shear (punch out) the metal plate M (see Fig. 2(4)). (5) Unnecessary metal parts (scrap S) generated simultaneously with the shearing are fitted into the shearing position of the metal plate by push-back and are held at the shearing position of the metal plate M without moving in the Z direction (see the same figure). (6) The scrap S is removed from the metal plate M when the metal plate M is further fed in the Y direction by the material feeding device. (7) The metal plate M processed into an ultrafine shape through the above steps is further fed in the Y direction by a material feeding device, wound around a reel, and recovered in the shape of a coil material (see Fig. 4(3)). In the reel winding, an interleaving paper is sandwiched to prevent damage due to the entanglement of very complex ultrafine shapes caused by the contact between metal plates.

[0020] The above (1) to (7) describe the steps that are essential for understanding the present invention. Needless to say, in addition to these, there are optionally present, for example, a cleaning step and a drying step of the metal plate.

[0021] The above (4) and (5) are the core parts of the method for manufacturing a metal plate according to the present invention. Specifically, in the conventional fine blanking press working, due to the pressure applied from the punch during shearing, the metal plate material moves about 1 mm in the Z direction and is sheared, so a space corresponding to the scrap portion punched out in the X - Y plane of the metal plate is generated. Therefore, strain caused by the propagation of pressure and shearing force occurs in the metal plate in the X - Y plane direction, and burrs are generated on the cutting surface. These have made it difficult to achieve ultra - high precision in the very complex ultrafine shape processing of an extremely thin metal plate. In the present invention, the extremely thin metal plate is sheared by sandwiching it with equal opposing forces of the punch and the knockout, and the scrap is held within the metal plate by push - back.

[0022] Here, the push-back referred to in the present invention is different in essence from the push-back (pushing back) referred to in the conventional fine blanking method. In the present invention, even at the bottom dead center of the punch 11, there is almost no intersection between the punch 11 and the die 14, and the metal plate is sheared while remaining substantially stationary in the Z direction, and the scrap S remains held at the shearing position. From an extremely microscopic perspective, at the time of shearing, the metal (scrap S) moves slightly in the Z direction, and an action (push-back) of being pushed back by the knockout 12 can be recognized, but that is extremely minute, and it can be said that the scrap S is sheared while remaining substantially stationary in the Z direction. The metal plate is sheared in such a way not because it is bound by theory, but because the metal plate is extremely thin at 50 μm or less and the clearance between the punch and the die is extremely small at 3 μm to 5 μm. It is considered that the metal plate is sheared when the cutting edge of the mold cuts in about 2 / 3 of the thickness of the metal plate.

[0023] By passing through the push-back referred to in the present invention of the present application in this way, the distortion operation of the extremely thin metal plate is almost completely sealed in the Z direction and the X-Y plane direction, and there is no escape field for the propagation of pressure and shearing force during shearing. As a result, deformation, damage, and burr generation of the metal plate during shearing can be maximally and effectively prevented, and the manufacture of an ultra-high-precision extremely thin metal plate having a very complex ultra-fine shape is realized.

[0024] Furthermore, since there is almost no intersection between the punch and the die during shearing and the shearing is performed while remaining substantially stationary, the wear of the upper and lower cutting edges is minimized, the frequency of edge grinding and member replacement can be significantly reduced, and cost reduction can also be realized.

[0025] As a press working device, it can be operated at SPM (strokes per minute) 300, and it is considered that it is also possible at SPM 600.

Example

[0026] As an example of the present invention, the manufacture of a VCM spring will be mainly described with reference to FIGS. 3 to 7.

[0027] Figure 3 is a cross-sectional view of the mold of the present invention used for manufacturing an exemplary VCM spring in the X-Y plane. Note that due to the shape of the mold of the present invention, it can also be regarded as a plan view of the mold as it is. (1) are the punches 11A to 11C and knockouts 12A to 12C provided in the press working apparatus of the present invention, and further the outer punches according to the prior art. Note that although each mold is drawn separately for clarity, a sufficient understanding can be obtained by comparing with FIG. 7 described later. (2) are the stripper 13 and die 14 corresponding to the punches 11A to 11C and knockouts 12A to 12C. It will be understood that this represents the shape of the VCM spring manufactured according to the present invention as it is, ignoring the shape error of 3 μm to 5 μm clearance. Note that only the main part related to the present invention is shown in the figure, and the ends of the four sides are omitted from the illustration.

[0028] In the manufacture of a VCM spring, a very complex ultra-fine shape is required on the inside, but the outside does not require such a complex shape (see FIG. 3). Therefore, an embodiment is conceivable in which two or more press positions are provided, and by a material feeding device (not shown), the outer press working is performed by a well-known technique in the previous stage, and the inner ultra-high-precision press working according to the present invention is performed in the subsequent stage (blanking progressive die working). For example, when the metal plate M is sequentially fed in the positive direction of Y by the material feeding device, and the press position 15 according to the present invention is set as the position Y, the previous stage is represented as the positions (Y - 2), (Y - 1), and the subsequent stage is represented as the position (Y + 1), the following flow is obtained. (1) Position (Y - 2): Incorporate the pilot P into the metal plate M by normal press working. (2) Position (Y - 1): Shear the metal plate M by normal press working to manufacture the outer part of the VCM spring. The scrap may pass through the die and fall downward in the Z direction. (3) Position Y: Further shear the metal plate M by the press working of the present invention at the press position 15 to manufacture the inner metal shaped part that requires the ultra-fine shape of the VCM spring. The scrap S is held inside the metal plate by push-back. (4) Position (Y + 1): Remove the scrap S from the metal plate M downward in the Z direction.

[0029] This will be further described in detail with reference to FIG. 4. The feed pitch pi shown in FIG. 4 is 0.25. That is, when the pilot P is incorporated in the metal plate M being fed in the positive Y direction on the press device at the position (Y - 2), the outer portion of the VCM spring is manufactured at the position (Y - 1) which is 4 pitches advanced in the Y direction from there, and the inner metal shaped portion requiring the ultra-fine shape of the VCM spring is manufactured at the position Y (press position 15) which is further 4 pitches advanced from there with the scrap S fitted therein, and the scrap S is removed at the position (Y + 1) which is further 4 pitches advanced from there. Further, the metal plate M is fed in the positive Y direction, wound around a reel, and recovered in the shape of a coil material. FIG. 4 shows this flow. In particular, referring to FIG. 4(2), it can be understood that processing is performed on the metal plate M every 4 pitches. Note that each reel contains 200,000 to 300,000 VCM springs.

[0030] FIG. 5 shows how the die 10 provided in the press device of the present invention is applied based on the B - B cross section of FIG. 3(2) in the manufacture of an exemplary VCM spring. The present invention will be better understood by referring to FIG. 5 in combination with FIGS. 2 and 3.

[0031] From FIGS. 3 and 5 described above, it is understood that the die of the present invention in the manufacture of an exemplary VCM spring has a very complex shape. FIG. 6 further depicts, for better understanding of the die of the present invention, a part of the die extracted and the meshing state based on the B - B cross section location as in FIG. 5. FIG. 7 depicts the meshing state of the entire die.

[0032] [Summary] (1) In the production of an extremely thin metal plate with a thickness of 50 μm or less having an ultrafine shape, in conventional press working, due to the pressure of the press and the force applied during shearing being transmitted to the metal plate, deformation and damage occur to the metal plate, and burrs that cannot be prevented from occurring also affect the accuracy, making it impossible. The present invention solves these problems by using an upper and lower symmetric mold with a clearance of 3 μm to 5 μm. During shearing, the upper mold and the lower mold hardly intersect at all, and while maintaining the state where the sheared scrap is fitted into the shearing position of the metal plate, it is fixed in the vertical direction to eliminate the escape space for metal plate deformation and the like, which is an epoch-making method. (2) Since the upper mold and the lower mold hardly intersect at all, the wear of the upper blade and the lower blade is minimized, the frequency of blade dressing and member replacement can be significantly reduced, and cost reduction can be achieved. (3) The mold of the present invention itself is also manufactured by a novel method in which the punch and the knockout, and the stripper and the die are processed while checking the meshing of each with the same member, and finally, the members are cut in one go while in the meshed state to simultaneously produce the punch and the knockout, and the stripper and the die. (4) The manufacturing method of an extremely thin metal plate with a thickness of 50 μm or less and having an ultra-fine shape by press working according to the present invention has an advantageous effect peculiar to the present invention that an ultra-high-precision extremely thin metal plate having a very complex ultra-fine shape can be mass-produced much more efficiently with a much simpler apparatus compared to photo-etching processing or wire cut electrical discharge machining. More specifically, in photo-etching processing, generally, a manufacturing process of providing a large number of same-shaped molds on a metal sheet extending in the X-Y plane direction is adopted (see Fig. 8), so a mechanism for controlling the movement of the metal sheet in the X-Y direction (two-dimensional) is required, and the complication and enlargement of the apparatus are inevitable. However, according to the present invention, it only needs to operate in the Y direction (one-dimensional), and a compact apparatus can be obtained. Also, in wire cut electrical discharge machining, since the wire is operated one by one along a very complex and fine shape, precise movement control in the X-Y plane direction is required for the manufacturing apparatus, and since the wire travels along a complex shape entirely, it also takes time for manufacturing. However, according to the present invention, by press working with a simple operation of only the up-and-down movement of the punch, it can be manufactured simply and instantaneously. Therefore, with the above-described simple feeding apparatus in the one-dimensional direction, mass production of several hundreds per minute is possible. (5) Further, in photo-etching processing, in the subsequent assembling process using the processed metal sheet (see Fig. 8), the two-dimensional metal sheet supplied to the assembling apparatus requires space, time, and a complex apparatus even when being exchanged. On the other hand, according to the manufacturing method of the metal plate of the present invention, since it becomes the shape of a coil material wound around a reel after manufacturing, in the subsequent assembling process, the metal plate can be quickly fed into the assembling apparatus simply by unwinding the reel of the metal plate. Also, the replacement of the reel does not require space like a two-dimensional metal sheet, and the metal plate can be replenished quickly, contributing to the space-saving and simplification of the apparatus.

Industrial Applicability

[0033] The present invention is useful in the field of manufacturing ultra-high-precision ultra-thin metal plates having very complex ultra-fine shapes. In particular, as exemplified, it is preferably used in the field of manufacturing VCM springs, and further in handicrafts (such as bookmarks) using ultra-thin metal plates with very complex ultra-fine shapes that are artistically refined.

Explanation of Signs

[0034] 1 First mold member 2 Second mold member 3 Clearance 10 Mold 11 Punch 12 Knockout 13 Stripper 14 Die 15 Press position M Metal plate P Pilot pi Feed pitch S Scrap

Claims

1. A method for manufacturing a die used for shearing an ultra-thin metal plate with a thickness of 50 μm or less by press working based on the fine blanking method, a step of processing the contour of a first die member that will later become a punch and a knockout into the shape of the punch, a step of processing the contour of a second die member that will later become a die and a stripper into the shape of a die having a clearance of 3 μm to 5 μm from the punch, and having, subsequently, the first die member and the second die member are simultaneously cut into two each in a plane orthogonal to the meshing direction while in a meshed state, so that the cutting surfaces have a plane-symmetrical shape, and the cutting surfaces become the contact surfaces with the metal plate during shearing of the metal plate, a punch and a knockout, and a die and a stripper having a plane-symmetrical shape and the cutting surfaces becoming the contact surfaces with the metal plate during shearing of the metal plate are manufactured. A method for manufacturing a die.

2. A die used for shearing an ultra-thin metal plate with a thickness of 50 μm or less by press working based on the fine blanking method, in a three-dimensional space defined by X, Y, and Z axes that are perpendicular to each other, when shearing the metal plate existing in the X-Y plane, a punch and a knockout that contact the metal plate from above and below in the Z direction so that the contact surfaces have the same X-Y plane coordinates, and a die and a stripper that contact the metal plate from above and below in the Z direction so that the contact surfaces have the same X-Y plane coordinates, wherein the clearance between the punch and the die is 3 μm to 5 μm. A die.

3. A press working apparatus based on the fine blanking method, when shearing the metal plate, a holder for attaching the punch and the die, and the knockout and the stripper to the press working apparatus so that the punch and the die, and the knockout and the stripper contact the metal plate in a state where the clearance between the punch and the die is 3 μm to 5 μm and apply pressure in the shearing direction. A press working apparatus using the die according to Claim 2.

4. A method for manufacturing an ultra-thin metal plate with a thickness of 50 μm or less having an ultra-fine shape by press working based on the fine blanking method, in a three-dimensional space defined by X, Y, and Z axes that are perpendicular to each other, A punch and knockout that contact the metal plate from above and below in the Z direction so that the contact surfaces have the same X-Y plane coordinates, and a die and stripper that contact the metal plate from above and below in the Z direction so that the contact surfaces have the same X-Y plane coordinates, shear a metal plate existing in the X-Y plane by contacting and pressing the metal plate in a state where the clearance between the punch and the die is 3 μm to 5 μm, and the scrap generated during shearing does not move in the Z direction and is held at the shearing position of the metal plate and is removed in a later process. A method for manufacturing a metal plate.

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