Tapping method after heat treatment surface hardening

Abstract

The invention relates to a tapping method of a workpiece after heat treatment surface hardening by which secondary tapping (thread tapping) can be conducted on an internal-thread bottom hole after surface hardening treatment is conducted on the workpiece. Heat treatment hardening is conducted on the surface of the workpiece internal-thread bottom hole. The tapping method after heat treatment surface hardening is characterized in that the workpiece after heat treatment surface hardening is fixed; the surface where the internal-thread bottom hole is of the workpiece faces up, and the internal-thread bottom hole is aimed at by a flame gun and heated; and when metal in the portion of the internal-thread bottom hole is heated and softened, a spiral tap is adopted rapidly, tapping is conducted on the internal-thread bottom hole, and the internal threads needed can be acquired. The tapping method after heat treatment surface hardening has the advantages that firstly, the repair effect is good; and according to the method, part of the threaded bottom hole is heated so that metal is softened, and after heating, the spiral tap is adopted rapidly so that tapping can be conducted again; secondly, the cost is low; and by means of the method, threads missed in the machining process can be restored better, re-feeding is avoided, and the development expense is lowered; and thirdly, the delivery time is short, the missed threads can be restored rapidly, the delivery time of development is basically not influenced, and the situation that the delivery time of samples is influenced by repetition of the process is avoided.

Description

technical field [0001] The invention relates to a tapping method of a heat-treated surface-hardened workpiece capable of performing secondary tapping (tapping) on ​​the internal thread bottom hole of the workpiece after surface-hardening treatment. Background technique [0002] In the process of new product development, it is often encountered that the shaft end has internal threads, but in the manufacturing process, it often happens that only the bottom hole of the thread is made and the tapping is missed. In particular, the development cycle of worm gear shafts is long, and the surface hardness after heat treatment is about HRC60. Once the tapping is missed, it can only be scrapped and re-fed, which causes delays in delivery. . Contents of the invention [0003] Design purpose: To avoid the deficiencies in the background technology, to design a tapping method that can not only realize the secondary tapping of the internal thread bottom hole after the surface hardening t...

AI Technical Summary

Problems solved by technology

[0002] In the process of new product development, it is often encountered that the shaft end has an internal thread, but in the manufacturing process, it often occurs that only the threaded bottom hole is made and the tapping is missed

In particular, the development cycle of worm gear shafts is long, and the surface hardness after heat treatment is about HRC60. Once a tap is missed, it can only be scrapped and re-fed, and the delivery date is delayed.

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