Punch of hard alloy holding-up hammer forming die and manufacturing method of punch

Abstract

The invention discloses a punch of a hard alloy holding-up hammer forming die and a manufacturing method of the punch, and relates to the technical field of hard alloy holding-up hammer dies, the punch is of an integrated structure, the punch comprises a step and a conical part, the step is of a circular structure, the conical part is connected to the step, and a central hole is formed in the conical part; the thickness of the conical part is gradually reduced from bottom to top, and the step height H1 on the inner side of the conical part is smaller than the step height H2 on the outer side of the conical part. Compared with a split structure, the size matching precision of the integrated structure is higher, joints do not exist in the integrally-formed die, layering cracks are not prone to occurring in a pressed product, the product quality is improved, and the machining process is short.

Description

Technical Field

[0001] The invention relates to the technical field of cemented carbide top hammer moulds, and in particular to a punch of a cemented carbide top hammer forming mould and a manufacturing method thereof. Background Art

[0002] The cemented carbide top hammer is an alloy material produced by powder metallurgy. The quality of the mold directly affects the pressing performance of the top hammer blank, which is a very important factor in the production process of cemented carbide top hammer. The punch is the main component of the mold. Most of the existing punches are split structures, which are assembled into a whole, such as Figure 1 , Figure 2 As shown in the figure, the manufacturing method of the split structure generally includes the following steps: 1) rough turning the round steel to leave the allowance to process the required shape; 2) heat treatment; 3) flat grinding the bottom surface to polish; 4) grinding the outer circle and outer taper; 5) slow wire cutting 5 petals; 6) slow wire cutting bevel; 7) polishing. This type of punch needs to be assembled and spliced ​​for use. At the splicing point, the product is prone to delamination and cracks during molding. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a punch for a cemented carbide top hammer forming die and a manufacturing method thereof, which adopts an integrated structure, has no seams, and avoids the phenomenon of product stratification.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a punch for a cemented carbide top hammer forming die, characterized in that the punch is an integrated structure, the punch includes a step and a cone, the step is a circular structure, the cone is connected to the step, and a central hole is opened inside the cone; the thickness of the cone gradually decreases from bottom to top, and the step height H1 on the inner side of the cone is less than the step height H2 on the outer side of the cone.

[0005] Preferably, one end of the central hole is a square structure.

[0006] Preferably, the punch is made of 42CrMoV steel.

[0007] Preferably, H1 is 30-40 mm, and H2 is 50-80 mm.

[0008] Preferably, the inclination angle α of the inner side surface of the cone is 45-47°.

[0009] Preferably, the angle β formed by the outer side surface of the cone is 3-4°.

[0010] The present invention also provides another technical solution: a method for manufacturing a punch of a cemented carbide top hammer forming die, characterized in that the steps are as follows: S1. Use 42CrMoV round steel, grind both ends parallel to the light and leave a margin; S2, rough-processing the round steel into the shape of a punch with a remaining allowance; S3, heat treating the punch to HRC58 to 62; S4, finishing the punch to the required size and shape; S5. Polish the punch.

[0011] Preferably, in step S2, a five-axis machining center is used for rough machining.

[0012] Preferably, in step S4, a five-axis machining center is used for finishing.

[0013] Compared with the prior art, the present invention has the following advantages and effects: compared with the split structure, the one-piece structure has higher dimensional matching accuracy, the one-piece mold has no seams, the pressed product is not prone to delamination cracks, the product quality is improved, and the processing flow is short. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of an existing split punch.

[0015] Figure 2 It is a schematic diagram of the side sectional structure of an existing split punch.

[0016] Figure 3 It is a schematic diagram of the overall structure of the integrated punch in Example 1 of the present invention.

[0017] Figure 4 It is a schematic diagram of the side sectional structure of the integrated punch in Example 1 of the present invention.

[0018] Figure 5 It is a schematic diagram of the side sectional structure of the integrated punch in Example 2 of the present invention. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without making creative work based on the embodiments of the present invention shall fall within the scope of protection of the present invention.

[0020] Embodiment 1: In the present embodiment, a punch for a cemented carbide top hammer forming die is provided. The punch is an integrated structure, made of 42CrMoV steel, and includes a step 1 and a cone 2. The step 1 is a circular structure, and the cone 2 is connected to the step 1. A central hole 3 is provided inside the cone 2. The thickness of the cone 2 gradually decreases from bottom to top, and the height of the step 1 on the inner side of the cone 2 is less than the height of the step 1 on the outer side of the cone 2.

[0021] In this embodiment, the manufacturing method of the punch includes the following steps: S1. Use 42CrMoV round steel, grind both ends parallel to the light and leave a margin; S2. Use a five-axis machining center to rough-process the round steel into the shape of the punch with a margin; S3, heat treating the punch to HRC58 to 62; S4. Use a five-axis machining center to finish the punch to the required size and shape; S5. Polish the punch.

[0022] Embodiment 2: The difference between this embodiment and embodiment 1 is that one end of the central hole 3 is a square structure, the step height H1 on the inner side of the cone 2 is 30-40 mm, and the step height H2 on the outer side of the cone 2 is 50-80 mm; the inclination angle α of the inner side surface of the cone 2 is 45-47°, and the angle β formed by the outer side surface of the cone 2 is 3-4°.

[0023] Although embodiments of the present invention have been shown and described, it will be apparent to those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and concepts of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A punch for a cemented carbide top hammer forming die, characterized in that: The punch is an integrated structure, comprising a step (1) and a cone (2); the step (1) is a circular structure; the cone (2) is connected to the step (1); a central hole (3) is provided inside the cone (2); the thickness of the cone (2) gradually decreases from bottom to top; a height H1 of the step (1) on the inner side of the cone (2) is smaller than a height H2 of the step (1) on the outer side of the cone (2).

2. The punch of the cemented carbide top hammer forming die according to claim 1, characterized in that: One end of the central hole (3) is a square structure.

3. The punch of the cemented carbide top hammer forming die according to claim 1, characterized in that: The punch is made of 42CrMoV steel.

4. The punch of the cemented carbide top hammer forming die according to claim 1, characterized in that: The H1 is 30-40 mm, and the H2 is 50-80 mm.

5. The punch of the cemented carbide top hammer forming die according to claim 1, characterized in that: The inclination angle α of the inner side surface of the cone (2) is 45-47°.

6. The punch of the cemented carbide top hammer forming die according to claim 1 or 5, characterized in that: The included angle β formed by the outer side surface of the cone (2) is 3-4°.

7. A method for manufacturing a punch of a cemented carbide top hammer forming die as claimed in any one of claims 1 to 6, characterized in that the steps as follows: S1. Use 42CrMoV round steel, grind both ends parallel to the light and leave a margin; S2, rough-processing the round steel into the shape of a punch with a remaining allowance; S3, heat treating the punch to HRC58 to 62; S4, finishing the punch to the required size and shape; S5. Polish the punch.

8. The method for manufacturing a punch of a cemented carbide top hammer forming die according to claim 7, wherein: In step S2, a five-axis machining center is used for rough machining.

9. The method for manufacturing a punch of a cemented carbide top hammer forming die according to claim 7, wherein: In step S4, a five-axis machining center is used for finishing.

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