TW201424878A - Die with surface microstructure and metal sheet punching device using the die - Google Patents

Abstract

This invention relates to a die with a surface microstructure and a metal sheet punching device using the die. The die comprises a support surface, a mold cavity and a surface microstructure. The mold cavity is concavely formed on the support surface. The surface microstructure is formed on the support surface. The metal sheet punching device comprises a die, a blank holder and a punch. The die comprises a support surface, a mold cavity and a surface microstructure. The mold cavity is concavely formed on the support surface. The surface microstructure is formed on the support surface. The blank holder is disposed on the die and has a pressing surface facing the support surface of the die. The punch can penetrate through the blank holder and the mold cavity of the die. Thus, the frictional force between the die and a blank can be reduced.

Description

Mold having surface microstructure and metal sheet stamping forming device using the same

The present invention relates to a mold and a press forming apparatus, and more particularly to a mold having a surface microstructure and a metal sheet 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 blank U from being subjected to the compressive stress Sc, wrinkles are generated, and the blank U is pressed by a pressing plate (not shown), thereby avoiding wrinkles of the blank U. . However, the above-mentioned method causes the friction between the blank U and the mold M to be greatly increased, so that the tensile stress St acting on the blank U is also greatly increased, thereby causing the blank U to be easily broken. Problems such as poor extension ratio.

Therefore, in order to effectively reduce the friction between the blank U and the mold M, it is necessary to provide an innovative and progressive mold with a surface microstructure and a metal sheet stamping forming apparatus using the mold to solve the above problems. .

The invention provides a mold having a surface microstructure, comprising a support surface, a cavity and a surface microstructure, wherein the cavity is recessed on the support surface, and the surface microstructure is formed on the support surface.

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

The surface microstructure of the mold of the present invention can produce a suitable tension to reduce the friction between it and a blank, and the surface microstructure can be used to store lubricating oil and form a lubrication between the mold and the blank. The oil film, whereby the friction between the mold and the billet can be greatly reduced.

The embodiments of the present invention can be more clearly understood, and the objects, features, and advantages of the present invention will become more apparent. The details are as follows.

Figure 2 shows a schematic perspective view of the mold of the present invention. Figure 3 is a cross-sectional view showing the structure of the mold of the present invention. Referring to FIG. 2 and FIG. 3, the mold 10 of the present invention comprises a support surface 10a, a cavity 11 and a surface microstructure m. The cavity 11 is recessed on the support surface 10a, and the surface microstructure is m Formed on the support surface 10a, it is particularly noted that the support surface 10a referred to in the present invention includes a chamfer (curved surface) at the entrance end of the cavity 11. In this embodiment, the surface microstructure m has a plurality of micro-grooves m1, and the micro-grooves m1 are recessed on the support surface 10a. 4 and FIG. 5 respectively show different distribution profiles of the surface microstructures m of the present invention. In the present embodiment, the distribution patterns of the micro-grooves m1 may be selected from the group consisting of arrays (FIG. 4) and radial shapes (FIG. 4). 5) One of the groups consisting of irregularities. Preferably, the depth of the micro-grooves m1 is between Between 0.2 microns and 100 microns, and the width of the micro-grooves m1 is between 0.5 microns and 100 microns.

Figures 6 and 7 show schematic views of other different surface microstructures of the mold of the present invention, respectively. As shown in FIG. 6, in another embodiment, the surface microstructure m has a plurality of micro-protrusions m2 protruding from the support surface 10a, and similarly, the micro-protrusions The distribution form of m2 may also be selected from one of a group consisting of arrays, radials, and irregularities. Preferably, the heights of the micro-protrusions m2 are between 0.2 micrometers and 100 micrometers, and the distance between the micro-protrusions m2 is between 0.5 micrometers and 100 micrometers. 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 mold 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 10 and a pressure plate. 20 and a punch 30.

The mold 10 includes a support surface 10a, a cavity 11 and a surface microstructure m. The support surface 10a can be provided with a blank U, and the cavity 11 is recessed on the support surface 10a. m is formed on the support surface 10a. In the present embodiment, the processing shape of the blank U depends on the design of the cavity 11 and the punch 30.

In addition, in the embodiment, the surface microstructure m has a plurality of micro-grooves m1, and the micro-grooves m1 are recessed on the support surface 10a. Referring to FIG. 4 and FIG. 5 again, in this 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.

Referring to FIG. 8, the pressure plate 20 is disposed above the mold 10, and the pressure plate 20 has a pressing surface 20a. The binder surface 20a faces the support surface 10a of the mold 10 and abuts the billet U.

The punch 30 can be inserted into the pressure plate 20 and the cavity 11 of the mold 10 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 20 presses the blank U, the surface microstructure m of the mold 10 can generate an appropriate tension to reduce The micro-groove m1 of the surface microstructure m can store a lubricating oil O, and form a lubricating oil film between the mold 10 and the blank U, Thereby, the frictional force between the mold 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‧‧‧Mold

10a‧‧‧Support surface

11‧‧‧ cavity

20‧‧‧Billing plate

20a‧‧‧ pressed surface

30‧‧‧ Punch

D‧‧‧Metal sheet stamping and forming device

m‧‧‧Surface microstructure

M‧‧‧Mold

M1‧‧‧ micro groove

M2‧‧‧ micro-bump

O‧‧‧Lubricating oil

Sc‧‧‧Compressive stress

St‧‧‧ tensile stress

U‧‧‧Bullet

1 shows a schematic view of a conventional metal sheet stamping; FIG. 2 shows a perspective view of the mold of the present invention; FIG. 3 shows a cross-sectional view of the mold of the present invention; FIG. 4 shows a schematic view of the surface microstructure of the present invention; FIG. 6 is a schematic view showing another surface microstructure of the mold of the present invention; FIG. 7 is a schematic view showing another surface microstructure of the mold of the present invention; Fig. 8 is a view showing the structure of a metal sheet press forming apparatus of the present invention.

10‧‧‧Mold

10a‧‧‧Support surface

11‧‧‧ cavity

20‧‧‧Billing plate

20a‧‧‧ pressed surface

30‧‧‧ Punch

D‧‧‧Metal sheet stamping and forming device

m‧‧‧Surface microstructure

M1‧‧‧ micro groove

O‧‧‧Lubricating oil

U‧‧‧Bullet

Claims (10)

A mold having a surface microstructure, comprising a support surface, a cavity and a surface microstructure, wherein the cavity is recessed on the support surface, and the surface microstructure is formed on the support surface. A mold having a surface microstructure according to claim 1, wherein the surface microstructure has a plurality of micro-grooves recessed in the support surface. A mold having a surface microstructure according to claim 2, wherein the distribution pattern of the micro-grooves is selected from the group consisting of arrays, radials, and irregularities. A mold having a surface microstructure according to claim 1, wherein the surface microstructure has a plurality of micro-protrusions protruding from the support surface. A mold having a surface microstructure according to claim 4, wherein the distribution pattern of the micro protrusions is selected from the group consisting of arrays, radials, and irregularities. A mold having a surface microstructure according to claim 1, wherein the surface microstructure is a concave-convex composite structure. A metal sheet stamping and forming apparatus comprises: a mold comprising a supporting surface, a cavity and a surface microstructure, wherein the cavity is recessed on the supporting surface, and the surface microstructure is formed on the supporting surface; a material plate is disposed above the mold, the pressure material plate has a pressing surface facing the support surface of the mold; and a punch is threaded on the pressure plate and the mold The cavity. A sheet metal stamping and forming apparatus according to claim 7, wherein the surface of the mold The microstructure has a plurality of micro-grooves recessed in the support surface. The sheet metal stamping and forming apparatus of claim 7, wherein the surface microstructure of the mold has a plurality of micro-protrusions protruding from the support surface. The sheet metal stamping and forming apparatus according to claim 7, wherein the surface microstructure of the mold is a concave-convex composite structure.