Beam bar cold heading die set

Abstract

The utility model discloses a bundle pole cold heading die set, including punch die assembly and main mould assembly, punch die assembly includes first punch die, second punch die, third punch die and fourth punch die, and first punch die, second punch die, third punch die and fourth punch die are equipped with first punch cavity, second punch cavity, third punch cavity and fourth punch cavity respectively, and all be equipped with punch needle in first punch cavity, second punch cavity and third punch cavity, the main mould assembly includes first main mould, second main mould, third main mould and fourth main mould, and first main mould, second main mould, third main mould and fourth main mould are respectively with first punch die, second punch die, third punch die and fourth punch die cooperation, the utility model discloses a first main mould, second main mould, third main mould and fourth main mould are respectively with first punch die, second punch die, third punch die and fourth punch die cooperation, so that die set can be with the bar material processing to bundle pole through four times cold heading, and the whole process step is simple, and production efficiency is higher, and the material is more saving, can effectively reduce production cost.

Description

Technical Field

[0001] This utility model relates to the technical field of fasteners, and in particular to the technical field of cold heading die sets. Background Technology

[0002] Fasteners are commonly used fasteners, and are generally manufactured using centerless grinders. However, this method consumes a large amount of material, generates a lot of waste, and has low production efficiency. A new type of fastener has been developed, featuring a five-segment structure with a hexagonal turning section in the middle. The outer diameters of the two segments closest to the turning section are larger than those of the two ends furthest from it. Tapered connecting sections are provided at the joints of each segment and at both ends of the fastener. Existing centerless grinder manufacturing methods cannot meet production requirements.

[0003] Existing patent CN108326226A discloses a cold heading process and cold heading module for forming adjusting screws. It is a six-die, six-punch cold heading die, comprising a first die, a second die, a third die, a fourth die, a fifth die, and a sixth die. The first die is used for the first binding of the part, forming the sixth part. The second die is used for the second binding of the part, forming the fifth part. The third die is used for the third binding and the first roughing of the part, forming the first part and a first rough section. The fourth die is used for the second roughing of the part, forming a second rough section. The fifth die is used for chamfering and the third roughing of the part, forming a third rough section, with a chamfer at the end of the sixth part. The sixth die is used for the upset washer and hexagonal shaping of the part, forming the second, third, fourth, and washer sections on the third rough section, and a hexagonal section at the end of the sixth part. Its structure is relatively complex, and the production process is also complex. Summary of the Invention

[0004] The purpose of this invention is to solve the problems in the prior art by proposing a cold heading mold assembly for bundled rods. This assembly has a simple structure and can be formed in four cold heading processes, thereby improving production efficiency.

[0005] To achieve the above objectives, this utility model proposes a cold heading die assembly for a bundled rod, comprising a die assembly and a main die assembly. The die assembly includes a first die, a second die, a third die, and a fourth die, each with a first cavity, a second cavity, a third cavity, and a fourth cavity, respectively. Each of the first, second, and third cavities contains a punch. The main die assembly includes a first main die, a second main die, a third main die, and a fourth main die, each cooperating with the first, second, third, and fourth dies. Each of the first, second, third, and fourth main dies contains a first main cavity, a second main cavity, a third main cavity, and a fourth main cavity, respectively. Each of the first, second, third, and fourth main cavities contains a push rod.

[0006] Preferably, the first punch and the first main die are fitted together during cold heading, and the first punch cavity, the first main cavity, the punch and the ejector pin together form a three-section mold cavity that is large in the middle and small at both ends. A tapered transition section is provided at the connection between the large inner diameter section and the small inner diameter section of the three-section mold cavity.

[0007] Preferably, the second die and the second main die have a gap during cold heading. The second punch cavity and the punch pin together form a first two-section mold cavity that is smaller at the top and larger at the bottom. The top of the small inner diameter section of the first two-section mold cavity, the connection between the small inner diameter section and the large inner diameter section of the first two-section mold cavity, and the bottom of the large inner diameter section of the first two-section mold cavity are all provided with tapered transition sections. The second main cavity and the ejector pin together form a second two-section mold cavity that is larger at the top and smaller at the bottom. The top of the large inner diameter section of the second two-section mold cavity, the connection between the small inner diameter section and the large inner diameter section of the second two-section mold cavity, and the bottom of the small inner diameter section of the second two-section mold cavity are all provided with tapered transition sections.

[0008] Preferably, the third die and the third main die have a gap during cold heading. The third punch cavity and the punch pin together form a third two-section mold cavity that is smaller at the top and larger at the bottom. The top of the small inner diameter section of the third two-section mold cavity, the connection between the small inner diameter section and the large inner diameter section of the third two-section mold cavity, and the bottom of the large inner diameter section of the third two-section mold cavity are all provided with tapered transition sections. The third main cavity and the ejector pin together form a fourth two-section mold cavity that is larger at the top and smaller at the bottom. The top of the large inner diameter section of the fourth two-section mold cavity, the connection between the small inner diameter section and the large inner diameter section of the fourth two-section mold cavity, and the bottom of the small inner diameter section of the fourth two-section mold cavity are all provided with tapered transition sections.

[0009] Preferably, the fourth punch and the fourth main die are bonded together during cold heading. The fourth punch cavity is composed of a receiving cavity and a hexagonal segment forming cavity connected sequentially from top to bottom. The fourth main cavity and the ejector pin together form a fifth two-section mold cavity that is larger at the top and smaller at the bottom. The top of the large inner diameter section of the fifth two-section mold cavity and the connection between the small inner diameter section and the large inner diameter section of the fourth two-section mold cavity are all provided with tapered transition sections.

[0010] The beneficial effects of this utility model are as follows: By cooperating the first main mold, the second main mold, the third main mold and the fourth main mold with the first punch, the second punch, the third punch and the fourth punch respectively, the mold group can process the bar into a bundled rod through four cold forging processes. The whole process is simple, the production efficiency is high, and the material consumption is relatively low, which can effectively reduce the production cost. Attached Figure Description

[0011] Figure 1 This is the front view of the cold heading mold assembly for the bundled rods of this utility model.

[0012] In the diagram: 1-First die, 2-Second die, 3-Third die, 4-Fourth die, 5-First main die, 6-Second main die, 7-Third main die, 8-Fourth main die, 10-Punch, 11-First cavity, 21-Second cavity, 31-Third cavity, 41-Fourth cavity, 42-Corner segment forming cavity, 50-Ejector pin, 51-First main cavity, 61-Second main cavity, 71-Third main cavity, 81-Fourth main cavity. Detailed Implementation

[0013] See Figure 1 This utility model relates to a cold heading die assembly for a bundled rod, comprising a punch assembly and a main die assembly. The punch assembly includes a first punch 1, a second punch 2, a third punch 3, and a fourth punch 4. The first punch 1, second punch 2, third punch 3, and fourth punch 4 are respectively provided with a first punch cavity 11, a second punch cavity 21, a third punch cavity 31, and a fourth punch cavity 41. Each of the first punch cavity 11, second punch cavity 21, and third punch cavity 31 is provided with a punch 10. The main die assembly includes a first main die 5 and a second main die 5. 6. The third main mold 7 and the fourth main mold 8, the first main mold 5, the second main mold 6, the third main mold 7 and the fourth main mold 8 respectively cooperate with the first punch 1, the second punch 2, the third punch 3 and the fourth punch 4. The first main mold 5, the second main mold 6, the third main mold 7 and the fourth main mold 8 are respectively provided with the first main cavity 51, the second main cavity 61, the third main cavity 71 and the fourth main cavity 81. The first main cavity 51, the second main cavity 61, the third main cavity 71 and the fourth main cavity 81 are all provided with push rods 50.

[0014] The first punch 1 and the first main die 5 are attached together during cold heading. The first punch cavity 11, the first main cavity 51, the punch 10 and the ejector pin 50 together form a three-section mold cavity with a large middle and small ends. A tapered transition section is provided at the connection between the large inner diameter section and the small inner diameter section of the three-section mold cavity.

[0015] The second punch 2 and the second main die 6 have a gap during cold heading. The second punch cavity 21 and the punch 10 together form a first two-section mold cavity with a smaller upper part and a larger lower part. The top of the small inner diameter section of the first two-section mold cavity, the connection between the small inner diameter section and the large inner diameter section of the first two-section mold cavity, and the bottom of the large inner diameter section of the first two-section mold cavity are all provided with tapered transition sections. The second main cavity 61 and the ejector pin 50 together form a second two-section mold cavity with a larger upper part and a smaller lower part. The top of the large inner diameter section of the second two-section mold cavity, the connection between the small inner diameter section and the large inner diameter section of the second two-section mold cavity, and the bottom of the small inner diameter section of the second two-section mold cavity are all provided with tapered transition sections.

[0016] The third die 3 and the third main die 7 have a gap during cold heading. The third punch cavity 31 and the punch 10 together form a third two-section mold cavity with a smaller upper part and a larger lower part. The top of the small inner diameter section of the third two-section mold cavity, the connection between the small inner diameter section and the large inner diameter section of the third two-section mold cavity, and the bottom of the large inner diameter section of the third two-section mold cavity are all provided with tapered transition sections. The third main cavity 71 and the ejector rod 50 together form a fourth two-section mold cavity with a larger upper part and a smaller lower part. The top of the large inner diameter section of the fourth two-section mold cavity, the connection between the small inner diameter section and the large inner diameter section of the fourth two-section mold cavity, and the bottom of the small inner diameter section of the fourth two-section mold cavity are all provided with tapered transition sections.

[0017] The fourth punch 4 and the fourth main die 8 are bonded together during cold heading. The fourth punch cavity 41 is composed of a receiving cavity and a hexagonal segment forming cavity 42 connected sequentially from top to bottom. The fourth main cavity 81 and the ejector rod 50 together form a fifth two-section mold cavity that is larger at the top and smaller at the bottom. The top of the large inner diameter section of the fifth two-section mold cavity and the connection between the small inner diameter section and the large inner diameter section of the fourth two-section mold cavity are all provided with tapered transition sections.

[0018] The working process of this utility model: In the working process of this utility model's cold heading die assembly for bar stock, the first die 1 and the first main die 5 cold heading the bar stock into a three-section first intermediate body that is larger in the middle and smaller at both ends. The second die 2 and the second main die 6 cold heading the first intermediate body into a five-section second intermediate body, wherein the three middle sections are formed by deforming the middle section of the first intermediate body. The third die 3 and the third main die 7 further cold heading the second intermediate body into a third intermediate body, except for the middle section, the other sections have the same dimensions as the finished product. The fourth die 4 and the fourth main die 8 cold heading the middle section into a hexagon to form the finished product.

[0019] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the protection scope of the present invention.

Claims

1. A cold heading die assembly for a bundled rod, characterized in that: The system includes a die assembly and a main die assembly. The die assembly includes a first die (1), a second die (2), a third die (3), and a fourth die (4). The first die (1), the second die (2), the third die (3), and the fourth die (4) are respectively provided with a first cavity (11), a second cavity (21), a third cavity (31), and a fourth cavity (41). Each of the first cavity (11), the second cavity (21), and the third cavity (31) is provided with a punch (10). The main die assembly includes a first main die (5), a second main die (6), a third main die (7), and a fourth main die (4). The main mold (8), the first main mold (5), the second main mold (6), the third main mold (7) and the fourth main mold (8) are respectively matched with the first punch (1), the second punch (2), the third punch (3) and the fourth punch (4). The first main mold (5), the second main mold (6), the third main mold (7) and the fourth main mold (8) are respectively provided with the first main cavity (51), the second main cavity (61), the third main cavity (71) and the fourth main cavity (81). The first main cavity (51), the second main cavity (61), the third main cavity (71) and the fourth main cavity (81) are all provided with push rods (50).

2. The cold heading die assembly for the bundled rods as described in claim 1, characterized in that: The first punch (1) and the first main die (5) are attached together during cold heading. The first punch cavity (11), the first main cavity (51), the punch (10) and the ejector pin (50) together form a three-section mold cavity with a large middle and small ends. A tapered transition section is provided at the connection between the large inner diameter section and the small inner diameter section of the three-section mold cavity.

3. The cold heading die assembly for the bundled rods as described in claim 1, characterized in that: The second punch (2) and the second main die (6) have a gap during cold heading. The second punch cavity (21) and the punch (10) together form a first two-section mold cavity with a small upper part and a large lower part. The top of the small inner diameter section of the first two-section mold cavity, the connection between the small inner diameter section and the large inner diameter section of the first two-section mold cavity, and the bottom of the large inner diameter section of the first two-section mold cavity are all provided with tapered transition sections. The second main cavity (61) and the ejector pin (50) together form a second two-section mold cavity with a large upper part and a small lower part. The top of the large inner diameter section of the second two-section mold cavity, the connection between the small inner diameter section and the large inner diameter section of the second two-section mold cavity, and the bottom of the small inner diameter section of the second two-section mold cavity are all provided with tapered transition sections.

4. The cold heading die assembly for the bundled rods as described in claim 1, characterized in that: The third die (3) and the third main die (7) have a gap during cold heading. The third cavity (31) and the punch (10) together form a third two-section mold cavity with a small upper part and a large lower part. The top of the small inner diameter section of the third two-section mold cavity, the connection between the small inner diameter section and the large inner diameter section of the third two-section mold cavity, and the bottom of the large inner diameter section of the third two-section mold cavity are all provided with tapered transition sections. The third main cavity (71) and the ejector rod (50) together form a fourth two-section mold cavity with a large upper part and a small lower part. The top of the large inner diameter section of the fourth two-section mold cavity, the connection between the small inner diameter section and the large inner diameter section of the fourth two-section mold cavity, and the bottom of the small inner diameter section of the fourth two-section mold cavity are all provided with tapered transition sections.

5. The cold heading die assembly for the bundled rods as described in claim 1, characterized in that: The fourth punch (4) and the fourth main die (8) are attached together during cold heading. The fourth punch cavity (41) is composed of a receiving cavity and a hexagonal segment forming cavity (42) connected from top to bottom. The fourth main cavity (81) and the ejector rod (50) together form a fifth two-section mold cavity with a large upper part and a small lower part. The top of the large inner diameter section of the fifth two-section mold cavity and the connection between the small inner diameter section and the large inner diameter section of the fourth two-section mold cavity are provided with tapered transition sections.

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