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Thread clamping fixture and secondary clamping machining method for high-precision bolt

A thread and clamping technology, which is applied in the field of thread clamping fixtures and secondary clamping processing of high-precision bolts, can solve the problems of low pass rate and other issues

Pending Publication Date: 2021-03-02
贵州特冶科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Practice has proved that the runout of the polished rod relative to the thread tolerance after processing through the above-mentioned p

Method used

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  • Thread clamping fixture and secondary clamping machining method for high-precision bolt

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Embodiment Construction

[0038] The invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so as to help understand the content of the present invention.

[0039] The invention provides a threaded clamping fixture, such as figure 1 As shown, it includes a clip body 1 and a lock nut 2 .

[0040] The clamp body 1 has an internal through hole 11. One end of the clamp body 1 has a clamping handle 12 for clamping the machine tool, and the other end has a clamp threaded hole 19 for clamping the bolt workpiece inside. The clamp threaded hole 19 A plurality of axial opening grooves 16 are opened around so that this section can be contracted and deformed. The length of the opening grooves 16 is greater than the length of the threaded hole 19 of the clamp and is not greater than the axial length of the lock nut 2. The outside of the front end of the clamp body 1 has a The external thread 14 that the clamp nut 2 cooperates has a clamp body transmission ...

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Abstract

The invention discloses a thread clamping fixture. The thread clamping fixture comprises a fixture body and a locking nut, wherein one end of the fixture body is provided with a clamping handle for clamping and fixing a machine tool chuck, the inner side of the other end of the fixture body is provided with a workpiece clamping threaded hole for clamping a workpiece, an open groove is formed around the workpiece clamping threaded hole, the outer side of the front end is provided with a transmission conical surface for transmitting locking force, and the middle of the outer side of the fixturebody is provided with external threads close to the transmission conical surface; and one end of the inner side of the locking nut is provided with internal threads matched with the external threads on the fixture body, and the other end of the inner side of the locking nut is provided with a transmission conical surface matched with the transmission conical surface of the fixture body. The invention further discloses a machining method. According to the machining method, secondary machining allowance is reserved for the size of a rod part during turning; the precision range of the pitch diameter size of the threads is controlled during thread rolling; and the sizes of supporting surfaces of the rod part and the head part are finely machined by centering the thread pitch diameter through the thread clamping fixture. By means of the fixture, through secondary clamping machining, the machining precision of the size and form and location tolerance of the head part and the screw part of the bolt part is guaranteed.

Description

technical field [0001] The invention relates to a thread clamping fixture and a processing method for high-precision bolt processing. Background technique [0002] As the machinery manufacturing industry has generally entered the era of micron scale, the size requirements for spare parts in various fields are getting higher and higher, including various high-precision bolts. [0003] At present, for the machining of bolts with high requirements for geometric tolerance and dimensional tolerance, the conventional process route is roughly as follows: [0004] 1. The head of the bolt is formed by hot forging; [0005] 2. Heat treatment to the required strength value; [0006] 3. The CNC lathe clamps the head of the bolt, and clamps the diameter of the rough-turned thread rolling blank and the size of the finished-turned polished rod at one time; [0007] 4. The diameter of the thread rolling blank is finely ground by the centerless grinder (the centerless grinding process is ...

Claims

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Application Information

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IPC IPC(8): B23P15/00B23Q3/12
CPCB23P15/00B23Q3/12
Inventor 张志勇汪碧涛
Owner 贵州特冶科技有限公司
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