Machining process of high-temperature-resistant anti-loosening bolt

Abstract

The invention discloses a machining process of a high-temperature-resistant anti-loosening bolt. The machining process comprises the following steps that S1, austenitic stainless steel is selected asa raw material, and a corresponding blank is manufactured according to the product specification; S2, cold heading is carried out to form four sections of blanks with different sizes, namely a head part, a first thread section section, a connecting section and a second thread section in sequence; and S3, the heads of the blanks are upset to be hexagonal. According to the machining process, standard threads and anti-loosening threads are twisted at a time, the machining process is simple, and the percent of pass of finished products is high; austenitic stainless steel is adopted as the raw material, and through solid solution and aging treatment, the hardness and the mechanical property reach the 10.9 grade; meanwhile, the thread form of the anti-loosening thread is not prone to deformation, the torque performance cannot be greatly attenuated, and the anti-loosening thread can be repeatedly used; a self-locking oblique angle is added, the situation that only one side face of a traditional thread is locked is changed, and the effect of locking the thread bottom and the side face of the external thread is achieved; and the reliability of tightening torque and clamping force is improved, and loosening can be effectively prevented.

Description

technical field [0001] The invention relates to the technical field of bolt processing, in particular to a processing technology for high temperature resistant and anti-loosening bolts. Background technique [0002] Bolts are used to fasten parts with through holes and are widely used in all walks of life. Different application scenarios have different requirements for bolts, such as extremely small bolts that need to be used in cameras, glasses, clocks, electronics, etc.; as for engineering, Buildings and bridges use large bolts; while in vehicles, aircraft, trams, automobiles, etc., both large and small bolts are required, and bolts play an important role in industry. [0003] In the existing fastener assembly structure, most of the standard internal thread self-locking structure is used. However, in the process of bolt processing and forming, there are still the following problems: [0004] 1. There are too many gaps in the standard thread matching, and the fasteners are...

AI Technical Summary

Problems solved by technology

[0004] 1. There are too many gaps in the standard thread matching, and the fasteners are prone to loosening during vibration and thermal expansion;

[0005] 2. After the nut is formed, the thread needs to be deformed separately to produce a limited self-locking effect, which cannot reliably meet the requirements of vibration and high temperature applications.

[0006] 3. The bolt tightening torque is small and cannot be repeated many times

Images