用于马车螺栓方颈部成型的主模套片

CN224508356UActive Publication Date: 2026-07-17SIP JUNLY IND PRECISION CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
SIP JUNLY IND PRECISION CO LTD
Filing Date
2025-07-22
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

In the existing technology, air stagnation is prone to occur during the forming of the square neck of the carriage bolt, resulting in incomplete forming, affecting the geometric dimensions and shape accuracy, and making it prone to slippage and failure during use.

Method used

The main mold sleeve adopts a splicing design. The joint seam of the molding module is aligned with the edge of the square hole. Combined with the interference fit between the tapered hole and the tapered surface, it can achieve efficient venting of the mold cavity and ensure smooth gas discharge.

Benefits of technology

It improves the forming accuracy and dimensional stability of the square neck of the carriage bolt, reduces the resistance of cold heading operation, and extends the service life of the mold.

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Abstract

用于马车螺栓方颈部成型的主模套片，包括套片主体，所述套片主体中心设有轴向贯穿的方形孔，套片主体由四个独立的成型模块拼接构成；成型模块朝向方形孔一侧的宽度小于背向方形孔一侧的宽度；相邻成型模块的接合缝与方形孔的棱边对齐；套片主体外周套设固定环，固定环的内孔与套片主体外周过盈配合。本实用新型将成型模块接合缝与方形孔的棱边对齐设置，在方颈部成型过程中，方形孔内的气体可顺棱边处的接合缝快速排出，同时由于接合缝与方形孔的棱边重合并沿轴向设置，可以避免方颈部成型过程中发生局部“憋气”，使马车螺栓方颈部成型饱满；可降低冷镦作业阻力，提高模具使用寿命，并增加马车螺栓产品尺寸稳定性。
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Claims

1. A main die sleeve for forming the square neck of a horse carriage bolt, comprising a sleeve body (1) provided with a square hole (1a) axially penetrating in the center, characterized in that: The main body (1) of the sleeve is composed of four independent molding modules (11) spliced ​​together; the width of the molding module (11) facing the square hole (1a) is smaller than the width of the side facing away from the square hole (1a); the joint seam of the adjacent molding modules (11) is aligned with the edge of the square hole (1a); a fixing ring (2) is fitted around the outer periphery of the main body (1), and the inner hole of the fixing ring (2) is interference-fitted with the outer periphery of the main body (1).

2. The main die sleeve for forming the square neck of a horse carriage bolt according to claim 1, characterized in that: The inner hole of the fixing ring (2) is an axially extending tapered hole, and the outer periphery of the sleeve body (1) is an axially extending tapered surface. Both the tapered hole and the tapered surface have a structure that is narrow at the top and wide at the bottom.

3. The main die sleeve for forming the square neck of a horse carriage bolt according to claim 1, characterized in that: The cone angle of the conical hole of the fixing ring (2) is 5°, and the cone angle of the conical surface of the sleeve body (1) is 6° to 8°.

4. The main die sleeve for forming the square neck of a horse bolt according to claim 1, wherein: The four molding modules (11) are identical in shape and size.

5. The main die sleeve for forming the square neck of a horse collar bolt as defined in claim 1 wherein: The mating surfaces of adjacent molding modules (11) are parallel to the axial direction of the sleeve body (1).

6. The main die sleeve for forming the square neck of a horse collar bolt according to claim 1, wherein: The upper and lower ends of the joint of adjacent molding modules (11) form a continuous surface.