TRIMMING DIE AND PUNCH THEREOF

Abstract

A trimming die includes a first die base assembly, a second die base assembly, and a trimming punch. The first die base assembly includes a fixing portion; the second die base assembly is positioned opposite the first die base assembly; the second die base assembly includes a die cavity portion; the die cavity portion has a die cavity and a die cavity inner wall; the die cavity inner wall has a plurality of first slant grooves; the punch has a fixing end portion and a trimming end portion positioned opposite the fixing end portion; the fixing end portion is disposed at the fixing portion; the trimming end portion is positioned corresponding to the die cavity; a peripheral surface of the trimming end portion includes a plurality of second slant grooves. A trimming punch is also provided.

Description

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the benefit of Taiwan Patent Application No. 101150945, filed on Dec. 28, 2012, which is hereby incorporated by reference for all purposes as if fully set forth herein.

TECHNICAL FIELD

The disclosure relates to a die and a punch thereof, and particularly to a trimming die and a trimming punch thereof.

BACKGROUND

The recent decade witnesses a rapid development of the electronics industry, along with which the sales volume of consumer electronics such as cell phones and notebook computers rises significantly. In recent years, these products are developed following the trend of small volume, light weight, desirable strength, and easy heat dissipation, so the components thereof also need to be metalized and refined. Producing components using semiconductors or non-conventional process has the disadvantages of high equipment cost, restrictions on materials applied in the process, a small depth-to-width ratio, and difficulty in producing three-dimensional components.

The stamping process is one of the key technologies for mass production of metal components in the conventional manufacturing industry. Trimming, drawing and bending dies are widely applied throughout the entire stamping process for various purposes. The stamping process has the advantages of high production efficiency, material conservation, high precision, good mechanical properties of finished products, unrestricted material application, and simplified component design, and complies with the current environmental concept requirement of green industry. Hence, the application of stamping metal in a micro-component, which is referred to as micro-stamping, is attracting more and more attentions.

Referring to FIG. 1A and FIG. 1B, FIG. 1A is a local schematic view of a conventional trimming die before a trimming punch thereof performs a trimming operation on a blank; FIG. 1B is a local schematic view of a conventional trimming die in FIG. 1A when a trimming punch thereof is performing a trimming operation on a blank.

As shown in FIG. 1A and FIG. 1B, the trimming die 5 includes a first die base assembly (for example, an upper die base assembly) and a second die base assembly (for example, a lower die base assembly) positioned corresponding to the first die. A trimming punch 50 and a blank holder 51 are disposed on the first die base assembly; the second die base assembly includes a die block 52, and the die block has a die cavity 520.

When an operator wants to perform a trimming operation on a blank 53, the blank holder 51 and the die block 52 of the trimming die may be used to fix the blank 53 at a processing position, and then a downward trimming force F of the trimming punch 50 is used to accomplish the trimming operation on the blank 53 (for example, forming a round hole at a central part of the blank 53, or shearing a part of a side edge of the blank 53).

However, an external peripheral surface of the trimming punch 50 of the conventional trimming die 5 or an inner wall of the die cavity 520 of the die block 52 of the second die base assembly does not have a special micro-structural design, so the trimming processing quality of the blank 53 is not as good as expected.

SUMMARY

The disclosure provides a trimming die capable of improving trimming quality of a blank, and a trimming punch thereof.

Accordingly, the disclosure provides a trimming die, comprising a first die base assembly, a second die base assembly and a trimming punch, wherein the first die base assembly comprises a fixing portion; the second die base assembly is positioned opposite the first die base assembly; the second die base assembly comprises a die cavity portion; the die cavity portion has a die cavity and a die cavity inner wall; the die cavity inner wall has a plurality of first slant grooves; the trimming punch has a fixing end portion and a trimming end portion positioned opposite the fixing end portion; the fixing end portion is disposed at the fixing portion, the trimming end. portion is positioned corresponding to die cavity, and a peripheral surface of the trimming end portion comprises a plurality of second slant grooves.

In the trimming die according to the embodiment of the disclosure, the first die base assembly further comprises a bolt element and a blank holder positioned corresponding to the die cavity portion, wherein an end of the bolt element is disposed at the fixing portion, and another end of the bolt element is disposed at the blank holder; the first die base assembly and the second die base assembly further comprise a guide pillar therebetween; the first die base assembly further comprises a guide pillar lining corresponding to the guide pillar; the fixing portion further comprises a punch back plate, a punch fixing plate, and a fixing element that joins the punch back plate and the punch fixing plate; the fixing end portion of the trimming punch leans against the punch back plate and is positioned at the punch fixing plate; the die cavity portion is formed of a die block and a die set.

In the trimming die according to the embodiment of the disclosure, the first slant grooves are arranged at intervals.

In the trimming die according to the embodiment of the disclosure, the first slant grooves are in the shape of a column-shaped recess, a V-shaped recess or an arc-shaped recess.

In the trimming die according to the embodiment of the disclosure, the second slant grooves are arranged at intervals.

In the trimming die according to the embodiment of the disclosure, the second slant grooves have the same length.

In the trimming die according to the embodiment of the disclosure, the second slant grooves are in the shape of a column-shaped recess, a V-shaped recess or an arc-shaped recess.

The disclosure further provides a trimming punch, comprising a trimming end portion, wherein a peripheral surface of the trimming end portion comprises a plurality of slant grooves.

In the trimming punch according to the embodiment of the disclosure, the slant grooves are arranged at intervals.

In the trimming punch according to the embodiment of the disclosure, the slant grooves have the same length.

In the trimming punch according to the embodiment of the disclosure, the slant grooves are in the shape of a column-shaped recess, a V-shaped recess or an arc-shaped recess.

The disclosure is characterized in that the second slant grooves of the trimming punch can reduce the trimming force of the punch on the blank during the trimming operation, thereby improving the trimming quality of the blank.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1A is a local schematic view of a trimming die before a trimming punch thereof performs a trimming operation on a blank;

FIG. 1B is a local schematic view of a trimming die in FIG. 1A when a trimming punch thereof is performing a trimming operation on a blank;

FIG. 2A is a schematic view of a trimming die before a trimming punch thereof performs a trimming operation on a blank according to an embodiment of the disclosure;

FIG. 2B is a local schematic view of a trimming die in FIG. 2A when a trimming punch thereof is performing a trimming operation on a blank;

FIG. 2C is a schematic view of a trimming die in FIG. 2A after a trimming punch thereof performs a trimming operation on a blank; and

FIG. 3 is a schematic view of a trimming die in which grooves of a trimming punch thereof and grooves of a die cavity inner wall are cross slant grooves according to another embodiment of the disclosure.

DETAILED DESCRIPTION

To make the objectives, features, and characteristics of the disclosure more comprehensible, related embodiments of the disclosure are described in detail below with reference to the accompanying drawings.

Referring to FIG. 2A, FIG. 2A is a schematic view of a trimming die before a trimming punch thereof performs a trimming operation on a blank according to an embodiment of the disclosure. An open-die state of the trimming die 1 is shown in FIG. 2A. The trimming die 1 is used for performing a trimming operation on a bank 20 and includes a first die base assembly 11, a second die base assembly 12, and a trimming punch 13. In this embodiment, the first die base assembly 11 is used as an upper die base assembly; the second die base assembly 12 is used as a lower die base assembly. However, due to actual design requirements of the die, the disclosure is not limited to this pattern.

The first die base assembly 11 includes a fixing portion 110; the second die base assembly 12 is positioned opposite the first die base assembly 11. The second die base assembly 12 includes a die cavity portion 120; the die cavity portion 120 has a die cavity 121 and a die cavity inner wall W. A surface (a surface of an effective working area) of the die cavity inner wall W has a plurality of first slant grooves G1 (more than two first slant grooves G1). In this embodiment, the die cavity portion 120 is formed of a die block 120a (a lower die block) and a die set 120b (a lower die set). The blank 20 is arranged on the die cavity portion 120.

The trimming punch 13 is applied to the trimming die 1. The trimming punch 13 has a fixing end portion 131 and a trimming end portion 132 positioned opposite the fixing end portion 131. The fixing end portion 131 is disposed at the fixing portion 110; the trimming end portion 132 is positioned corresponding to the die cavity 121. An external peripheral surface of the trimming end portion 132 includes a plurality of second slant grooves G2 (more than two second slant grooves G2).

Specifically, the first die base assembly 11 further includes a bolt element 111 and a blank holder 112 positioned corresponding to a surface of the die cavity portion 120. An end of the bolt element 111 is disposed at the fixing portion 110; another end of the bolt element 111 is disposed at the blank holder 112. A spring (not shown) may be assembled at the bolt element 111, and the spring is located between the fixing portion 110 and the blank holder 112.

In addition, the first die base assembly 11 and the second die base assembly 12 further include a guide pillar 14 therebetween for guiding the opening or closing of the trimming die 1; the first die base assembly 11 further includes a guide pillar lining 140 corresponding to the guide pillar 14, so as to prevent the guide pillar 14 from directly contacting and thus damaging the first die base assembly 11.

The fixing portion 110 further includes a punch back plate 110a, a punch fixing plate 110b, and a fixing element 15 that joins the punch back plate 110a and the punch fixing plate 110b. The fixing end portion 131 of the trimming punch 13 leans against the punch back plate 110a and is positioned at the punch fixing plate 110b.

Referring to FIG. 2A to FIG. 2C at the same time, FIG. 2B is a local schematic view of a trimming die in FIG. 2A when a trimming punch thereof is performing a trimming operation on a blank; FIG. 2C is a schematic view of a trimming die in FIG. 2A after a trimming punch thereof performs a trimming operation on a blank.

As shown in FIG. 2B, the surface at the die cavity inner wall W has a plurality of first slant grooves G1, and these first slant grooves G1 are arranged at intervals. An external peripheral surface of the trimming end portion 132 of the trimming punch 13 has a plurality of second slant grooves G2. The second slant grooves G2 are arranged at intervals, and the second slant grooves G2 have the same length and form an effective working area.

When an operator wants to perform a trimming operation on a blank 20, the blank 20 may be placed on the die cavity portion 120. When the trimming die 1 is driven, the first die base assembly 11 is enabled to approach the second die base assembly 12 under the guide of the guide pillar 14. As shown in FIG. 2B, the blank 20 is fixed between the blank holder 112 and the die block 120a.

At this time (as shown in FIG. 2B), while the trimming punch 13 is performing the trimming operation on the blank 20, the second slant grooves G2 on the peripheral surface of the trimming end portion 132 of the trimming punch 13 can reduce a trimming force of the trimming punch 13 on the blank 20; meanwhile, the first slant grooves G1 of the die cavity inner wall W can reduce a trimming force of the blank 20 on an inner side of the die cavity 121, thereby improving trimming quality of the blank 20. After the trimming operation is completed, the trimming die 1 turns to a close-die state (as shown in FIG. 2C).

Referring to FIG. 3, FIG. 3 is a schematic view of a trimming die in which grooves of a trimming punch thereof and grooves of a die cavity inner wall are cross slant grooves according to another embodiment of the disclosure.

As shown in FIG. 3, the first slant grooves G1 may be in the shape of a cross slant groove; and the second slant grooves G2 may also be in the shape of a cross slant groove. Definitely, in different designs, the first slant grooves G1 and the second slant grooves G2 may be column-shaped recesses, V-shaped recesses, arc-shaped recesses or recesses of other geometrical shapes (for example, recesses of irregular shapes); the shapes of the grooves are not limited to the disclosure of FIG. 3. The trimming processing quality of the blank 20 can also be improved by means of these patterns.

It should be noted that, although the trimming punch in the shape of a round column is taken as an example for description, in a practical trimming die, in order to cater for the trimming shape or other requirements of the blank, the trimming punch may also be in the shape of an elliptic column, a square column, a triangular column, and the like, and the shape is not limited to the disclosure of the above embodiment. Moreover, the slant grooves on the peripheral surface of the trimming end portion of the punch may also vary along with the shape of the trimming punch. In addition, the slant grooves (the first slant grooves and the second slant grooves) on the peripheral surface of the trimming end portion of the trimming punch and on the die cavity inner wall may also be applied to cutting faces of an upper cutter and a lower cutter of a shearing machine.

In conclusion, exemplary implementations or embodiments described above are used for illustrating the technical means adopted in the disclosure to solve the problem, and are not intended to limit the implementation scope of the disclosure. Equivalent changes and modifications made following the meaning of the scope of the patent application or according to the scope of the patent shall fall within the scope of the patent.

Claims

1. A trimming die, comprising:

a first die base assembly, comprising a fixing portion;

a second die base assembly, positioned opposite the first die base assembly, wherein the second die base assembly comprises a die cavity portion; the die cavity portion has a die cavity and a die cavity inner wall; the die cavity inner wall has a plurality of first slant grooves; and

a trimming punch, having a fixing end portion and a trimming end portion positioned opposite the fixing end portion, wherein the fixing end portion is disposed at the fixing portion; the trimming end portion is positioned corresponding to the die cavity; and a peripheral surface of the trimming end portion comprises a plurality of second slant grooves.

2. The trimming die according to claim 1, wherein the first die base assembly further comprises a bolt element and a blank holder positioned corresponding to the die cavity portion; an end of the bolt element is disposed at the fixing portion, and another end of the bolt element is disposed at the blank holder.

3. The trimming die according to claim 2, wherein the first die base assembly and the second die base assembly further comprise a guide pillar therebetween; the first die base assembly further comprises a guide pillar lining corresponding to the guide pillar.

4. The trimming die according to claim 2, wherein the fixing portion further comprises a punch back plate, a punch fixing plate, and a fixing element that joins the punch back plate and the punch fixing plate; the fixing end portion of the trimming punch leans against the punch back plate and is positioned at the punch fixing plate.

5. The trimming die according to claim 2, wherein the die cavity portion is formed of a die block and a die set.

6. The trimming die according to claim 1, wherein the first slant grooves are arranged at intervals.

7. The trimming die according to claim 1, wherein the first slant grooves are in the shape of a column-shaped recess, a V-shaped recess or an arc-shaped recess.

8. The trimming die according to claim 1, wherein the second slant grooves are arranged at intervals.

9. The trimming die according to claim 1, wherein the second slant grooves have the same length.

10. The trimming die according to claim 1, wherein the second slant grooves are in the shape of a column-shaped recess, a V-shaped recess or an arc-shaped recess.

11. A trimming punch, comprising a trimming end portion, wherein a peripheral surface of the trimming end portion comprises a plurality of slant grooves.

12. The trimming punch according to claim 11, wherein the slant grooves are arranged at intervals.

13. The trimming punch according to claim 11, wherein the slant grooves have the same length.

14. The trimming punch according to claim 11, wherein the slant grooves are in the shape of a column-shaped recess, a V-shaped recess or an arc-shaped recess.