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Outer thread tail end pulling twisting coining part

A technology of external thread and thread, which is applied in the direction of threaded fasteners, screws, connecting components, etc., and can solve the problem of small tightening torque of polygonal embossing

Inactive Publication Date: 2018-02-16
AVIC STANDARD PARTS MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, polygonal embossing has the disadvantage of low tightening torque

Method used

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  • Outer thread tail end pulling twisting coining part
  • Outer thread tail end pulling twisting coining part
  • Outer thread tail end pulling twisting coining part

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] In the following, with reference to the accompanying drawings and preferred embodiments, the specific implementation, structure, features and functions of the external thread end wrenching stamping according to the present invention will be described in detail as follows.

[0015] see Figure 1-4 , a wrenching impression at the end of an external thread of the present invention, including a hollow impression 2 on the thread 1, a continuous curve 3 on the end face 4, the continuous curve 3 is composed of five petals 9 of the same size, and the adjacent petals 9 are connected by circular arcs tangent to the sides. The hollow imprint 2 on the end of the external thread 1, the continuous curve 3 on the end face 4, wherein the continuous curve 3 is composed of 4-10 petals 9 of the same or different sizes evenly distributed, and the adjacent petals 9 pass through The arc is tangent to the side to achieve the connection.

[0016] The ratio of the maximum distance 7 and the m...

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PUM

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Abstract

The invention discloses an outer thread tail end pulling twisting coining part. The outer thread tail end pulling twisting coining part comprises a hollow coining part (2) at the tail end of an outerthread (1) and a continuous curve (3) on an end (4), the continuous curve (3) is composed of evenly-distributed four to ten same or different petals (9), the adjacent petals (9) are connected througharcs tangent with side faces, and the ratio of the maximum distance (7) between the hollow coining part (2) and the thread outer circumference surface (5) to the minimum distance (8) is 1.25 to 1.75.The coining part has the beneficial effects that punching forming is easily achieved, cracking is not prone to happening, and the twisting torque is large.

Description

technical field [0001] The invention belongs to the field of installation of external thread products, and in particular relates to a wrench stamp at the end of an external thread. Background technique [0002] Current wrenching parts, such as bolts, contain a wrench impression at the end of the thread, which is polygonal in shape and designed to fit a correspondingly shaped wrench tool. It can be seen during the screw and nut assembly that in all these known parts the indentation cooperating with the tool is always present at the end of the external thread or on a protruding part. This enables the tool to apply a tightening torque during assembly without causing deformation of the wrench impression. When the thread adopts rolling forming technology to form the required thread part on the blank, no matter whether the embossing groove is hexagonal or other polygonal, cracks may appear on the corners of the embossing groove, and these cracks originate from the cross section...

Claims

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Application Information

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IPC IPC(8): F16B35/06
CPCF16B35/06
Inventor 苏毅刘洪萍张丹于海萌邱娟刘雪峰杨武春
Owner AVIC STANDARD PARTS MFG
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