A punch for cold extrusion of a disc hub

Abstract

The utility model provides a kind of male die for disc hub cold extrusion belongs to mechanical technical field.It solves the higher problem of higher use cost of existing disc hub cold extrusion male die.This disc hub cold extrusion male die includes the body of column, the bottom of body is detachably connected with the punch of the coaxial arrangement of body, punch projects on the bottom of body axially.The utility model has the advantages such as low manufacturing cost, low use cost.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical technology and relates to a punch, particularly a punch for cold extrusion of disc hubs. Background Technology

[0002] The disc hub is a key load-bearing component of the clutch. In the past, it was generally manufactured by forging, which has the problems of complex manufacturing process, long process time and high cost. Therefore, the disc hub is now processed by cold extrusion.

[0003] The cold extrusion apparatus includes an upper die and a lower die. A cylindrical punch is connected to the bottom of the upper die, and a cylindrical punch head is coaxially arranged at the bottom of the punch. The punch is a one-piece structure, requiring the bar stock to be machined. This results in a large machining volume, which leads to waste of material costs and machining cycle time. Moreover, during use, when the punch head wears or breaks, the entire punch needs to be replaced, resulting in high operating costs. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in the prior art by providing a low-cost, low-usage punch for cold extrusion of disc hubs.

[0005] The purpose of this utility model can be achieved through the following technical solution: a punch for cold extrusion of disc hubs, comprising a columnar body, characterized in that a punch coaxially arranged with the bottom of the body is detachably connected to the bottom of the body, and the punch axially protrudes from the bottom of the body.

[0006] In the aforementioned punch for cold extrusion of disc hubs, the punch includes a connecting part and an insert part. The connecting part is columnar, and the top surface of the connecting part has a connecting section that is coaxially arranged with the connecting part and protrudes axially. The connecting section is threadedly connected to the internal thread blind hole at the bottom of the body through an external thread on the outer wall. The insert part is coaxially arranged with the connecting part and has a threaded section that is threadedly connected to the bottom of the connecting part.

[0007] In the aforementioned punch for cold extrusion of disc hubs, the outer wall of the insertion part has a radially outwardly protruding shoulder, and the connecting part has a step for the shoulder to abut against.

[0008] In the aforementioned punch for cold extrusion of a disc hub, the top of the insertion part has an internal hexagonal blind hole, and the top of the connecting part has a through hole communicating with the internal hexagonal blind hole.

[0009] In the aforementioned punch for cold extrusion of disc hubs, the outer wall of the connecting portion has a limiting surface or a limiting hole.

[0010] In another scenario, in the aforementioned punch for cold extrusion of a disc hub, the punch includes a connecting sleeve and a limiting post. The connecting sleeve is inserted into the bottom of the body, and the outer wall of the connecting sleeve has a radially protruding convex ring. The connecting sleeve is fitted with a locking cap that is threadedly connected to the body. The inner ring of the locking cap is supported on the bottom of the convex ring, and the top of the convex ring abuts against the bottom surface of the body. The limiting post axially passes through the connecting sleeve and has a protruding portion extending out of the bottom of the connecting sleeve. The outer wall of the limiting post has a radially protruding shoulder, and the inner wall of the connecting sleeve has a stepped surface for the shoulder to abut against.

[0011] In the aforementioned punch for cold extrusion of disc hubs, the top of the body has a radially outward protrusion, and the body transitions to the protrusion via a tapered section.

[0012] Compared with existing technologies, the punch used for cold extrusion of this disc hub is easy to manufacture, has low manufacturing cost, is easy to replace, and has low operating cost. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of the punch used for cold extrusion of this disc hub in Example 1.

[0014] Figure 2 This is a cross-sectional view of the punch used for cold extrusion of this disc hub in Example 2.

[0015] In the figure, 1 is the body; 11 is the protrusion; 12 is the conical section; 2 is the punch; 21 is the connecting part; 211 is the connecting section; 212 is the through hole; 213 is the limiting hole; 22 is the insertion part; 221 is the threaded section; 222 is the shoulder; 223 is the internal hexagon blind hole; 23 is the connecting sleeve; 231 is the convex ring; 24 is the limiting post; 241 is the convex shoulder; and 3 is the locking cap. Detailed Implementation

[0016] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments. Example 1

[0017] like Figure 1 As shown, the punch for cold extrusion of the disc hub includes a columnar body 1, and a punch 2 coaxially arranged with the bottom of the body 1 is detachably connected to the bottom of the body 1. The punch 2 protrudes axially from the bottom of the body 1.

[0018] In this cold extrusion die for disc hubs, the body 1 and the punch 2 are separate structures. The body 1 and the punch 2 can be processed separately from bar stock of corresponding size, with small machining allowance, which will not cause material waste and reduce manufacturing costs. During use, the appropriate punch 2 can be replaced according to the size of the disc hub, which is convenient to operate. When the punch 2 is worn or broken, only the punch 2 needs to be replaced, without replacing the whole die, which reduces the cost of use.

[0019] In further detail, in this embodiment, the punch 2 includes a connecting part 21 and an insert part 22. The connecting part 21 is columnar, and its top surface has a connecting section 211 that is coaxially arranged with the connecting part 21 and protrudes axially outward. The connecting section 211 is threadedly connected to the internally threaded blind hole at the bottom of the body 1 through an external thread on its outer wall. The insert part 22 is coaxially arranged with the connecting part 21 and has a threaded section 221 that is threadedly connected to the bottom of the connecting part 21. Through the threaded connection, the connecting part 21 and the punch, as well as the connecting part 21 and the insert part 22, are easily connected. During use, the bottom of the connecting part 21 is the extrusion surface, and the insert part 22 acts as a limiting force. When the insert part 22 wears or breaks, it can be replaced, thus reducing the cost of use.

[0020] The outer wall of the insertion part 22 has a radially outwardly protruding shoulder 222, and the connecting part 21 has a step for the shoulder 222 to abut against. In this way, the shoulder 222 and the step cooperate to provide axial positioning for the insertion part 22, ensuring the connection accuracy between the insertion part 22 and the connecting part 21; in this embodiment, when the shoulder 222 abuts against the step, the bottom surface of the shoulder 222 is flush with the bottom surface of the connecting part 21.

[0021] The top of the plug portion 22 has a hexagonal blind hole 223, and the top of the connecting portion 21 has a through hole 212 that connects to the hexagonal blind hole 223. When the plug portion 22 breaks off, an Allen wrench is inserted into the through hole 212 to connect the hexagonal blind hole 223, making it easier to rotate the plug portion 22 that remains in the connecting portion 21 after breaking off. This prevents the broken plug portion 22 from remaining in the connecting portion 21 and being unable to be removed, thus facilitating the replacement of the plug portion 22.

[0022] The outer wall of the connecting part 21 has a limiting surface or limiting hole 213. The limiting surface or limiting hole 213 facilitates the limiting of the wrench and makes it easy to rotate the connecting part 21. In this embodiment, the outer wall of the connecting part 21 has four circumferentially distributed limiting holes 213.

[0023] The top of the body 1 has a radially outward protrusion 11, and the body 1 transitions to the protrusion 11 through a conical section 12. This facilitates the installation and positioning of the body 1, and the conical section 12 ensures that the body 1 is in close contact with the mold base, preventing the body 1 from rotating and providing good operational stability. Example 2

[0024] like Figure 2As shown, this embodiment is basically similar in structure and principle to embodiment 1. The difference is that in this embodiment, the punch 2 includes a connecting sleeve 23 and a limiting post 24. The connecting sleeve 23 is inserted into the bottom of the body 1. The outer wall of the connecting sleeve 23 has a radially protruding ring 231. The connecting sleeve 23 is fitted with a locking cap 3 that is threadedly connected to the body 1. The inner ring of the locking cap 3 is supported on the bottom of the protruding ring 231. The top of the protruding ring 231 abuts against the bottom surface of the body 1. The limiting post 24 passes through the connecting sleeve 23 axially and has a protruding part that extends out of the bottom of the connecting sleeve 23. The outer wall of the limiting post 24 has a radially protruding shoulder 241. The inner wall of the connecting sleeve 23 has a stepped surface for the shoulder 241 to abut against.

[0025] During installation, first pass the limiting post 24 axially through the top of the connecting sleeve 23 until the shoulder 241 abuts against the step surface. The limiting post 24 should not fall out of the connecting sleeve 23. Then, put the locking cap 3 on the connecting sleeve 23 and rotate the locking cap 3 to make it threadedly connected to the body 1 until the locking cap 3 locks the convex ring 231 and the connecting sleeve 23 is axially limited. At this time, the installation is completed. The limiting post 24 is used to limit the hub, and the bottom surface of the connecting sleeve 23 is the extrusion surface. When the limiting post 24 is worn or broken, unscrew the locking cap 3, remove the connecting sleeve 23 and the limiting post 24, and then remove the limiting post 24 from the connecting sleeve 23 and replace it. Then reinstall it. In this way, only the limiting post 24 needs to be replaced, which saves the usage cost.

[0026] Contents not described in detail herein are existing technologies known to those skilled in the art. The specific embodiments described herein are merely illustrative examples illustrating the spirit of this invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this invention or exceeding the scope defined by the appended claims.

Claims

1. A punch for cold extrusion of disc hubs, comprising a columnar body (1), characterized in that, The bottom of the body (1) is detachably connected to a punch (2) coaxially arranged with the body (1). The punch (2) protrudes axially from the bottom of the body (1). The punch (2) includes a connecting part (21) and a plug-in part (22). The connecting part (21) is columnar. The top surface of the connecting part (21) has a connecting section (211) coaxially arranged with the connecting part (21) and protruding axially. The connecting section (211) is threadedly connected to the internal thread blind hole at the bottom of the body (1) through the external thread on the outer wall. The plug-in part (22) is coaxially arranged with the connecting part (21). The plug-in part (22) has a threaded section (221) threadedly connected to the bottom of the connecting part (21).

2. The punch for cold extrusion of disc hubs according to claim 1, characterized in that, The outer wall of the plug portion (22) has a ring of radially protruding shoulder (222), and the connecting portion (21) has a step for the shoulder (222) to abut against.

3. The punch for cold extrusion of disc hubs according to claim 2, characterized in that, The top of the plug part (22) has an internal hexagon blind hole (223), and the top of the connecting part (21) has a through hole (212) communicating with the internal hexagon blind hole (223).

4. The punch for cold extrusion of disc hubs according to claim 3, characterized in that, The outer wall of the connecting part (21) has a limiting surface or a limiting hole (213).

5. A punch for cold extrusion of disc hubs according to any one of claims 1 to 4, characterized in that, The top of the body (1) has a radially outward protrusion (11), and the body (1) transitions to the protrusion (11) through a conical section (12).

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