Secondary punching die

Abstract

A first tool bit is arranged at the front end of a second tool bit, the first tool bit is provided with a first punching face and a second punching face, and the first punching face and the second punching face form two edges of the first tool bit in a triangular shape in the side view angle. The included angle between the first punching face and the second punching face is an acute angle which is at most 30 degrees. The triangular punching tool bit is arranged at the front end of the hole drawing tool bit, so that a punching die and an evacuating die are combined into a whole.

Description

Technical Field

[0001] The utility model relates to the field of metal stamping dies, and particularly relates to a secondary punching die. Background Art

[0002] Figure 1 Show an existing punching die, and the pre-punching action of a metal plate is realized by arranging a cylindrical punch head 10 at the front end of a die rod 50. This die can only perform pre-punching. If flanging of the metal plate needs to be realized subsequently, an additional process is required, and a drawing die is used to achieve it. Content of the Utility Model

[0003] In order to overcome the above-mentioned defects of the prior art, the purpose of the utility model is to provide a secondary punching die to achieve the purpose of reducing the punching process.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A secondary punching die is provided with a first cutting head at the front end of a second cutting head. The first cutting head has a first cutting surface and a second cutting surface. The first cutting surface and the second cutting surface form two sides of the first cutting head that are triangular in a side view. The included angle between the first cutting surface and the second cutting surface is an acute angle of at most 30°.

[0006] In a preferred embodiment of the utility model, the second cutting head is hemispherical, and the extending direction of the angular bisector of the punching of the first cutting head is coaxial with the axis of the secondary punching die and the radius line of the second cutting head.

[0007] In a preferred embodiment of the utility model, the spherical radius of the second cutting head is R10.

[0008] In a preferred embodiment of the utility model, the first cutting surface and the second cutting surface are arc surfaces, and the arc surfaces make the first cutting head form a non-linear structure that is narrower at the bottom and wider at the top.

[0009] In a preferred embodiment of the utility model, a transition part for smooth connection with a die rod is arranged at the rear end of the second cutting head.

[0010] The beneficial effect of the utility model lies in:

[0011] The secondary punching die provided by the utility model combines punching and drawing dies into one by arranging a triangular punching cutting head at the front end of a drawing cutting head. Description of the Drawings

[0012] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art.

[0013] Figure 1 It is a schematic diagram of the prior art.

[0014] Figure 2 It is an overall schematic diagram of the mold of the present invention.

[0015] Figure 3 It is a partially enlarged view of the first cutter head part.

[0016] Figure 4 It is a sectional view of the first cutter head part.

[0017] Figure 5 It is a partially enlarged view of the second cutter head part. Detailed implementation manners

[0018] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. The above description is for the convenience of describing the present invention and simplifies the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0019] The singular forms "a", "the" and "said" used in the specification include the plural forms unless clearly specified. The terms "comprising", "including" and "containing" used in the specification indicate the presence of the claimed features, but do not exclude the presence of one or more other features. The term "and / or" used in the specification includes any and all combinations of one or more of the related listed items.

[0020] In the specification, when it is said that an element is "on", "fixed to", "connected to", "joined to", etc. another element, the element can be directly on, fixed to, connected to, joined to or in contact with the other element, or there can be an intermediate element. In the specification, when a feature is arranged "adjacent" to another feature, it can mean that a feature has a part overlapping with the adjacent feature or a part located above or below the adjacent feature.

[0021] It can be understood that although the terms "first", "second", etc. can be used herein to describe different elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. Therefore, the first element can be called the second element without departing from the teachings of the concept of the present application.

[0022] Exemplary embodiments of the present application will be described below with reference to the accompanying drawings. However, it should be understood that the present application can be presented in many different ways and is not limited to the embodiments described below. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide more additional embodiments. In all the drawings, the same reference numerals denote the same or functionally identical elements.

[0023] Referring to Figure 2 the overall structure of the shown die, a second cutting head 30 and a first cutting head 20 are sequentially arranged at the lower end of the die rod 50. The first cutting head 20, the second cutting head 30 and the die rod 50 are coaxial, so that when the die punches a metal part downward, after the surface of the part is broken by the first cutting head 20, the second cutting head 30 is used to push the material away and form a flanging. A transition member 40 is arranged between the rear end of the second cutting head 30 and the die rod 50 to make the surfaces of the two smoothly transition.

[0024] Figure 3 and Figure 4 shows the partial structure of the first cutting head. From the side view, the first cutting head 20 is triangular in shape, and the first cutting surface 21 and the second cutting surface 22 on both sides thereof form two adjacent sides of the above triangle. The intersection of the first cutting surface 21 and the second cutting surface 22 is the cutting tip 23. The first cutting head 20 pierces the surface of the metal part through the cutting tip 23 to form a hole. The included angle between the first cutting surface 21 and the second cutting surface 22 is set to an acute angle less than or equal to 30°, so that after the metal part is pierced by the cutting tip 23, its waste material is still connected to the edge of the hole without falling off. Preferably, the included angle θ of the cutting tip 23 is 30°. In order to achieve two operations in one step, the angular bisector of the included angle θ, the radius of the spherical second cutting head 30 and the axis 1 of the die are set to be coaxial.

[0025] In another embodiment, the first cutting surface 21 and the second cutting surface 22 are designed as arc-shaped surfaces, so that the first cutting head 20 is narrow at the bottom and wide at the top and its width changes non-linearly. This structure enables the included angle at the cutting tip 23 to be designed smaller, making it easier to pierce the metal and then gradually expand the hole.

[0026] Figure 5 shows the structure of the second cutting head. The second cutting head 30 is hemispherical in shape, and its function is to further uniformly expand the hole and cooperate with the lower die to form a flanging around the hole for the extruded material. Preferably, the spherical radius of the second cutting head 30 is R10.

Claims

1. A secondary punching die, characterized in that: A first cutting head is arranged at the front end of the second cutting head, and the first cutting head has a first punching surface and a second punching surface. The first punching surface and the second punching surface constitute two sides of a triangle shape of the first cutting head in a side view, and the angle between the first punching surface and the second punching surface is an acute angle of at most 30°.

2. A secondary punching die as claimed in claim 1, characterized in that: The second cutter head is hemispherical, and the extending direction of the punching angle bisector of the first cutter head is coaxial with the axis of the secondary punching die and the radius line of the second cutter head.

3. A secondary punching die as claimed in claim 2, characterized in that: The spherical radius of the second cutter head is R10.

4. A secondary punching die as claimed in claim 1, characterized in that: The first punching surface and the second punching surface are arcuate surfaces, and the arcuate surfaces enable the first cutting head to form a nonlinear structure of being narrow at the bottom and wide at the top.

5. A secondary punching die according to any one of claims 1 to 3, characterized in that: A transition component for smoothly connecting with the mold rod is arranged at the rear end of the second cutter head.

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