Machining method for preventing rolled threads of TC4 titanium alloy material from generating folds

Abstract

The invention provides a machining method for preventing rolled threads of a TC4 titanium alloy material from generating folds. The method comprises following steps: previous preparation is carried out; thread lines are obtained through roll pressing; a product workblank is clamped on a thread roller; a heating coil is adjusted, and the heating length is determined; a product workblank outer circle is heated, rapid transferring is carried out, and thread rolling is carried out; the threads are subject to trial rolling; the thread rolling result is detected in a macro / micro manner; through strict control over the thread rolling process, the heating length, the thread rolling length segment temperature, consistency and uniformity of a color strip and metallographic inspection, whether the thread folds and tooth bottom circular arcs R are qualified or not is judged, qualification is tested through mechanical performance, and the problem that in the rolling molding technology, the folds exist on the TC4 high-strength titanium alloy bolt threads is solved; and through strict control over the steps, requirements of thread tooth tips and the tooth bottom circular arcs R are met, thread folding is avoided, and through tensile tests and fatigue tests, the test requirement of product mechanical performance is met.

Description

technical field [0001] The invention relates to the technical field of titanium alloy bolt processing, in particular to a processing method for avoiding folding of TC4 titanium alloy material rolling threads. Background technique [0002] In the forming process of high-strength titanium alloy material external thread, the traditional process method is to adopt the process method of forced cold rolling forming. This thread forming method often has defects such as arc R folds at the bottom of the thread, cracks on the flanks, and notches at the cusps, which lead to the failure of the thread strength of the product to meet the requirements of the mechanical performance test. However, the existing coil heating and rolling thread forming process uses infrared temperature measurement, and the temperature measurement point data on the heating length is single-point data, so that the actual heating temperature is inconsistent with the infrared temperature measurement data, resulting...

AI Technical Summary

Problems solved by technology

This thread forming method often has defects such as arc R folding at the bottom of the thread, cracking on the flank, and notch at the cusp, which leads to the failure of the thread strength of the product to meet the requirements of the mechanical performance test.

However, the existing coil heating and rolling thread forming process uses infrared temperature measurement, and the temperature measurement point data on the heating length is single-point data, so that the actual heating temperature is inconsistent with the infrared temperature measurement data, resulting in local overheating, Overburning and other phenomena, performance decline after the test, can not meet the requirements of tensile test and fatigue test

Images