Production method and device of removing internal stress of steel wire for cold upsetting

Abstract

A method for eliminating the internal stress of steel wire features use of normalizing mode instead of annealing for higher machinability of steel wire. Its apparatus is composed of payoff, MF or HF induction heater wind ring coil, and winder.

Description

Technical field: [0001] The invention relates to a production method and device for eliminating internal stress of a steel wire used for cold heading forging. Background technique: [0002] The existing steel wire material for cold heading and forging is processed and produced by stretching, and after processing and production, there is a relatively large internal stress inside the steel wire. Internal stress needs to be relieved before performing upsetting for cold heading. [0003] For internal stress relief of wire, the existing method is to adopt annealing heat treatment method, such as the utility model patent No. 96226437.7 provides a galvanized steel wire intermediate frequency induction annealing device, which provides a galvanized steel wire to eliminate internal stress The way is to adopt the annealing method, and provide an annealing device, including an intermediate frequency power supply, a wire take-up device, an induction heater, and a heat preservation secti...

AI Technical Summary

Problems solved by technology

The annealing heat treatment in the above method is not suitable for steel wire rods for cold heading and forging, because the annealing method has a high temperature, and the steel wire rods are easy to carbonize or sinter, which is not conducive to cold heading forging.

At the same time, the time required for annealing is relatively long, and the equipment is relatively complicated. In more cases, it is necessary to add protective gas for protection, and the entire heat treatment process is complicated.

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