TWI472385B - A sheet metal having a surface microstructure and a metal plate press forming apparatus using the press plate - Google Patents

Description

Stamping plate with surface microstructure and metal plate stamping forming device using the same

The present invention relates to a press plate and a press forming apparatus, and more particularly to a press plate having a surface microstructure and a metal plate press forming apparatus using the same.

Please refer to FIG. 1 , which is a schematic view showing a conventional metal sheet stamping. In the press forming process, a radial stress direction of one of the blanks U disposed on a mold M generates a tensile stress St, and a circumferential direction of the blank U generates a compressive stress Sc. Conventionally, in order to prevent the billet U from being subjected to the compressive stress Sc, wrinkles are generated, and the billet U is pressed against a billet (not shown), thereby resisting the compressive stress Sc. However, the above method can greatly increase the friction between the blank U and the pressure plate, so that the tensile stress St acting on the blank U is also greatly increased, thereby causing the blank U to be easily broken. And problems such as poor extension ratio. Therefore, in order to effectively reduce the friction between the blank U and the pressure plate, it is necessary to provide an innovative and progressive pressure plate to solve the above problems.

The invention provides a pressure plate with a surface microstructure, which has a pressing surface and a surface microstructure, and the surface microstructure is formed on the pressing surface.

The invention further provides a metal sheet stamping and forming apparatus, which comprises a mold, a pressure plate and a punch. The mold has a support surface and a cavity, and the cavity is recessed on the support surface. The pressure plate is disposed above the mold, the pressure plate has a pressing surface and a surface microstructure, the pressing surface is facing the supporting surface of the mold, and the surface microstructure is formed on the pressing material surface. The punch is threaded through the pressure plate and the cavity of the mold.

The surface microstructure of the binder plate of the present invention produces suitable tension to reduce friction with a billet, and the surface microstructure can be used to store lubricating oil between the binder plate and the billet. A lubricating oil film is formed, whereby the friction between the pressure plate and the billet can be greatly reduced.

Figure 2 shows a perspective view of the binder plate of the present invention. Figure 3 is a schematic view showing the surface microstructure of the binder plate of the present invention. Referring to FIG. 2 and FIG. 3, the pressure plate 10 of the present invention has a pressing surface 10a and a surface microstructure m. The surface microstructure m is formed on the pressing surface 10a. In this embodiment, The surface microstructure m has a plurality of micro-grooves m1, and the micro-grooves m1 are recessed in the binder surface 10a. 4 and FIG. 5 respectively show different distribution profiles of the surface microstructures m of the present invention. In this embodiment, the distribution patterns of the micro-grooves m1 may be selected from the array (FIG. 4) and radial (FIG. 5). And one of the groups formed by the irregularities. The micro-grooves m1 have a depth dimension of between 0.2 micrometers (μm) and 100 micrometers, and the micro-grooves m1 have a width dimension of between 0.5 micrometers and 100 micrometers.

6 and 7 respectively show other different surface microstructures of the binder plate of the present invention. As shown in FIG. 6, in another embodiment, the surface microstructure m has a plurality of micro-protrusions m2, and the micro-protrusions m2 are protruded from the pressing surface 10a. Similarly, the micro-protrusions m2 The distribution form may also be selected from one of a group consisting of arrays, radials, and irregularities, and the heights of the micro-protrusions m2 are between 0.2 micrometers and 100 micrometers, and the micro-scales are The spacing of the protrusions m2 is between 0.5 microns and 100 microns. Alternatively, as shown in FIG. 7, in still another embodiment, the surface microstructure m may be a concave-convex composite structure.

Fig. 8 is a view showing the structure of a metal sheet press forming apparatus of the present invention. Referring to FIG. 8 , FIG. 2 and FIG. 3 , the pressure plate 10 of the present invention is used in a metal sheet press forming apparatus D. In the embodiment, the metal sheet press forming apparatus D includes a mold 20 . A pressure plate 10 and a punch 30.

The mold 20 has a support surface 20a and a cavity 21, and the support surface 20a is provided with a blank U, and the cavity 21 is recessed on the support surface 20a. In this embodiment, the blank The shape of the U is determined by the design of the cavity 21 and the punch 30.

The pressure plate 10 is disposed above the mold 20, and the pressure plate 10 has a pressing surface 10a and a surface microstructure m. The binder surface 10a faces the support surface 20a of the mold 20 and abuts the billet U. The surface microstructure m is formed on the binder surface 10a. In the embodiment, the surface microstructure m has a plurality of micro-grooves m1, and the micro-grooves m1 are recessed on the binder surface 10a. Referring to FIG. 4 and FIG. 5 again, in the embodiment, the distribution pattern of the micro-grooves m1 may be selected from the group consisting of an array (FIG. 4), a radial shape (FIG. 5), and an irregular shape. One of the groups.

The punch 30 can be inserted into the pressure plate 10 and the cavity 21 of the mold 20 during the pressing stroke to facilitate stamping the blank U into a designed shape.

In the present embodiment, when the punch 30 punches the blank U downward, although the pressure plate 10 presses the blank U, the surface microstructure of the pressure plate 10 can generate an appropriate tension. In order to reduce the friction between each other, the micro-grooves m1 of the surface microstructure m can store a lubricating oil O, and a lubricating oil film is formed between the pressure plate 10 and the blank U. The friction between the pressure plate 10 and the blank U can be greatly reduced.

The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the scope of the present invention. The scope of the invention should be as set forth in the appended claims.

10. . . Pressure plate

10a. . . Pressing surface

20. . . Mold

20a. . . Support surface

twenty one. . . Cavity

30. . . shower

D. . . Metal sheet stamping forming device

m. . . Surface microstructure

M. . . Mold

M1. . . Microgroove

M2. . . Micro bump

O. . . lubricating oil

Sc. . . Compressive stress

St. . . Tensile stress

U. . . Billet

Figure 1 shows a schematic view of a conventional metal sheet stamping;

Figure 2 is a perspective view showing the binder plate of the present invention;

Figure 3 is a schematic view showing the surface microstructure of the binder plate of the present invention;

Figure 4 is a schematic view showing the distribution of the surface microstructure of the present invention;

Figure 5 is a schematic view showing another distribution of the surface microstructure of the present invention;

Figure 6 is a schematic view showing the microstructure of another surface of the pressure plate of the present invention;

Figure 7 is a schematic view showing still another surface microstructure of the pressure plate of the present invention;

Fig. 8 is a view showing the structure of a metal sheet press forming apparatus of the present invention.

10. . . Pressure plate

10a. . . Pressing surface

20. . . Mold

20a. . . Support surface

twenty one. . . Cavity

30. . . shower

D. . . Metal sheet stamping forming device

m. . . Surface microstructure

M1. . . Microgroove

O. . . lubricating oil

U. . . Billet

Claims (6)

A pressure plate with a surface microstructure has a pressing surface and a surface microstructure formed on the pressing surface, the surface microstructure having a plurality of micro grooves, the micro grooves The recess is disposed on the binder surface, and the microgrooves have a depth dimension of between 0.2 micrometers and 100 micrometers. A pressure plate having a surface microstructure according to claim 1, wherein the distribution pattern of the micro grooves is selected from the group consisting of arrays, radials, and irregularities. The pressure plate of the surface microstructure of claim 1, wherein the surface microstructure has a plurality of micro-protrusions protruding from the pressing surface. A pressure plate having a surface microstructure according to claim 3, wherein the distribution pattern of the micro protrusions is selected from the group consisting of arrays, radials, and irregularities. A metal sheet stamping forming apparatus comprises: a mold having a supporting surface and a cavity, wherein the cavity is recessed on the supporting surface; and a pressing plate is disposed above the die, the pressing plate The utility model has a pressing surface and a surface microstructure, the pressing surface facing the supporting surface of the mold, and the surface microstructure is formed on the pressing surface, the surface microstructure having a plurality of micro grooves, The micro-grooves are recessed on the binder surface, and the micro-grooves have a depth dimension of between 0.2 micrometers and 100 micrometers; A punch can be worn on the pressure plate and the cavity of the mold. The sheet metal stamping and forming apparatus of claim 5, wherein the surface microstructure of the binder sheet has a plurality of microprotrusions protruding from the binder surface.