TWI692381B - Stamping device - Google Patents

Abstract

A stamping device is suitable for punching a metal sheet into a circular sheet-shaped sheet. The stamping device includes a mother die, a pressing plate, a punch, and a counter punch. The female mold has a bearing surface facing upward and used to carry the metal sheet, and a cavity formed from the bearing surface downward and having a circular cross section. The pressing plate is movably provided above the mother mold and used to press against the metal sheet. The pressing plate has a through hole corresponding to the cavity. The punch is movably arranged above the cavity of the mother die for punching the metal sheet into the sheet metal part, and the punch has a downward punch and a circular punch corresponding to the cavity A circular groove is formed upward on the pressing surface, and the center of the circular groove is located at the center of the pressing surface.

Description

Stamping device

The invention relates to a stamping device, in particular to a stamping device suitable for punching metal sheets into sheet parts.

Generally, if thin metal sheet parts are processed by grinding, due to the problem of internal stress relief, it is difficult to achieve flatness requirements especially for large-area sheet parts. If the blanking die is used instead, it is often difficult to have a flat product due to rebound warpage, and the smoothness of the cross section is not ideal. Therefore, recently for thin metal sheet parts, a precision blanking stamping device 200 is often used for punching. As shown in FIG. 1, this stamping device 200 generally has a female die 201, a blanking plate 202, and a punch 203. And a counter-punch 204, by the pressing plate 202 and the counter-punch 204 pressing the metal sheet 30 during the punching process, the vertical section of the punched thin metal sheet member 40 can be made vertical The degree and smoothness are improved, and the thin metal sheet member 40 is relatively flat. However, since the thin metal sheet 40 will still spring back toward the recoil head due to stress relief after stamping, as shown in FIG. 2, when the thin metal sheet 40 with a large area is flat When there is a high degree of requirement, the finished product punched by the aforementioned stamping device 200 may still not meet the demand, and the secondary product needs to be processed again to meet the requirements.

Therefore, one of the objects of the present invention is to provide a way to improve the prior art One less punching device.

Therefore, in some embodiments, the stamping device of the present invention is suitable for punching a metal sheet into a circular piece. The stamping device includes a mother die, a material pressing plate, and a punch , A counter punch. The female mold has a bearing surface facing upward and used to carry the metal sheet, and a cavity formed from the bearing surface downward and having a circular cross section. The pressing plate is movably provided above the mother mold and used to press against the metal sheet. The pressing plate has a through hole corresponding to the cavity. The punch is movably arranged above the cavity of the mother die for punching the metal sheet into the sheet metal part, and the punch has a downward punch and a circular punch corresponding to the cavity A circular groove is formed upward on the pressing surface, and the center of the circular groove is located at the center of the pressing surface. The counter-punching head is movably arranged in the cavity of the mother die, and is used for clamping the metal material sheet with the punch during the punching process.

In some embodiments, the punch further has at least one annular convex portion formed downward from the circular groove, and the center of the annular convex portion is located at the center of the punching surface.

In some embodiments, the height of the annular convex portion is smaller than the depth of the circular groove.

In some embodiments, the thickness of the metal sheet is defined as t, and the radius of the punching surface of the punch is R, and the distance between the periphery of the circular groove and the periphery of the stamping surface is between 3t and 0.15R between.

In some embodiments, the difference between the depth of the circular groove and the height of the annular convex portion is between 0.25t and 1.75t.

In some embodiments, the inner diameter of the annular convex portion is less than 0.25R, and the outer diameter is greater than 0.5R.

In some embodiments, the bottom surface of the clamping plate is formed downwardly around the through hole to form a clamping ring for pressing against the metal web.

In some embodiments, the cross section of the pressure ring is an inverted triangle.

The present invention has at least the following effects: the circular groove on the punching surface of the punch enables the metal sheet to have a space to deflect toward the punch during the punching process, so that the punched sheet After the stress is released and the component rebounds toward the counter-punch, the overall structure is relatively flat to reduce the need for secondary processing.

10: Stamping device

1: Female mold

11: bearing surface

12: mold cavity

2: pressure plate

21: through hole

22: Press ring

3: punch

31: Stamping surface

32: Round groove

33: Ring convex part

4: backflush

200: stamping device

201: Master

202: pressure plate

203: punch

204: kickback

30: Metal blank

40: Sheet metal

D1: distance

D2: Difference

R1: inner diameter

R2: outer diameter

Other features and effects of the present invention will be clearly presented in the embodiment with reference to the drawings, in which: FIG. 1 is a schematic cross-sectional view of a prior art stamping device; FIG. 2 is a stamping device made by the prior art stamping device 3 is a schematic cross-sectional view of an embodiment of the stamping device of the present invention; FIG. 4 is a bottom view of the punch of this embodiment; and FIGS. 5-7 are A plurality of cross-sectional schematic diagrams illustrating the process of punching a metal sheet into a sheet in this embodiment.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same numbers.

Referring to FIGS. 3 to 7, an embodiment of the stamping device 10 of the present invention is suitable for punching a thin metal sheet 30 into a circular sheet-shaped sheet member 40. The stamping device 10 includes a female die 1, a blanking plate 2, a punch 3, and a counter-punch 4.

The female mold 1 has a bearing surface 11 facing upward and used to carry the metal sheet 30, and a cavity 12 formed downward from the bearing surface 11 and having a circular cross section. The pressure plate 2 is vertically movable above the mother mold 1 and is used to press against the metal sheet 30. The pressure plate 2 has a through hole 21 corresponding to the mold cavity 12, in this embodiment, The bottom surface of the pressure plate 2 surrounds the through hole 21 and is formed with a pressure ring 22 pressed against the metal sheet 30. The cross section of the pressure ring 22 is an inverted triangle. It should be noted that In other embodiments, the cross section of the pressure ring 22 may also be semi-circular, semi-elliptical or other geometric shapes. In addition, the female mold 1 may also have a press ring (not shown) corresponding to the press ring 22 of the press plate 2, which is not limited to this embodiment.

The punch 3 is movably provided above the cavity 12 of the mother die 1 for punching the metal sheet 30 into the sheet member 40. The punch 3 has a downward direction and is formed with the cavity 12 Corresponding to a circular stamping surface 31, a circular groove 32 is formed upwardly, and an annular convex portion 33 formed downward from the circular groove 32, the circular groove 32 and The center of the annular convex portion 33 is located at the center of the punching surface 31, and in this embodiment, the height of the annular convex portion 33 is smaller than the depth of the circular groove 32. It should be noted that the number of the ring-shaped convex portions 33 may also be plural, and in this case, the ring-shaped convex portions 33 are arranged in order from inside to outside, which is not limited by this embodiment. The counter-punch 4 is movably provided in the cavity 12 of the mother die 1 and is used for clamping the metal blank 30 with the punch 3 during the punching process. With the circular groove 32 on the punching surface 31 of the punch 3, the metal blank 30 can be oriented toward the The space where the punch 3 deflects, and the annular protrusion 33 on the circular groove 32 of the punch 3 prevents the metal sheet 30 from excessively deflecting toward the punch 3 during the stamping process, and After the stress is released, the sheet member 40 rebounds toward the counter punch 4 and the overall structure is relatively flat (see FIG. 7 ).

In detail, the thickness of the metal sheet 30 is defined as t, and the radius of the punching surface 31 of the punch 3 is R. After software simulation analysis and comparison, the circumference of the circular groove 32 and the punching surface 31 The distance D1 of the periphery is preferably between 3t and 0.15R. The difference D2 between the depth of the circular groove 32 and the height of the annular convex portion 33 is preferably between 0.25t and 1.75t. It is preferable that the inner diameter R1 of the annular convex portion 33 is smaller than 0.25R, and the outer diameter R2 is larger than 0.5R. However, it should be noted that the purpose of the interval of the above proportional relationship is to optimize the stamping device 10, so it should not be limited to this.

In summary, the stamping device 10 of the present invention allows the metal sheet 30 to deflect toward the punch 3 during the stamping process through the circular groove 32 on the punching surface 31 of the punch 3, And by the annular convex portion 33 on the circular groove 32 of the punch 3, the metal sheet 30 is prevented from excessively deflecting toward the punch 3 during the stamping process, and the punched sheet member 40 After the stress is released and rebounds towards the counter-punch 4, the overall structure is relatively flat to reduce the need for secondary processing.

However, the above are only examples of the present invention, and should not be used to limit the scope of the present invention. Any simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the patent specification are still classified as This invention covers the patent.

10: Stamping device

1: Female mold

11: bearing surface

12: mold cavity

2: pressure plate

21: through hole

22: Press ring

3: punch

31: Stamping surface

32: Round groove

33: Ring convex part

4: backflush

30: Metal blank

D1: distance

D2: Difference

R1: inner diameter

R2: outer diameter

Claims (7)

A stamping device is suitable for punching a metal sheet into a circular piece. The stamping device includes: a female die with a bearing surface facing upward and for carrying the metal sheet, and A mold cavity formed downward from the bearing surface and having a circular cross-section; a pressing plate, which is movably provided above the mother mold and used to press against the metal sheet, the pressing plate has a corresponding to the mold A through hole of the cavity; a punch, which can be moved up and down above the cavity of the mother die for punching the metal sheet into the sheet metal part, the punch has a downward direction and corresponds to the cavity A circular punching surface of which is formed with a circular groove facing upward, and the center of the circular groove is located at the center of the punching surface, wherein the punch also has a downward direction from the circular groove At least one ring-shaped convex portion formed, the center of the ring-shaped convex portion is located at the center of the stamping surface; and a counter-punch, which can be moved up and down in the cavity of the mother die, and is used in the punching process The metal blank is clamped together with the punch. The punching device according to claim 1, wherein the height of the annular convex portion is smaller than the depth of the circular groove. The stamping device according to claim 2, wherein the thickness of the metal sheet is defined as t, and the radius of the punching surface of the punch is R, and the distance between the circumference of the circular groove and the circumference of the stamping surface is Between 3t and 0.15R. The stamping device according to claim 3, wherein the difference between the depth of the circular groove and the height of the annular convex portion is between 0.25t and 1.75t. The punching device according to claim 4, wherein the inner diameter of the annular convex portion is smaller than 0.25R, and the outer diameter is larger than 0.5R. The stamping device according to any one of claims 1 to 5, wherein a bottom ring of the pressing plate is formed downwardly around the through hole to form a pressing ring for pressing against the metal sheet. The stamping device according to claim 6, wherein the cross section of the press ring is an inverted triangle.

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