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Henan Friend Metal Products Co.,Ltd

The Processing Technology Of Quenching Spring Steel Wire


1. Crude specification production technology:

At present, there are three main kinds of production process flow of coarse gauge quenching spring steel wire.

Process 1: hot rolled wire, testing, blasting, eddy current testing, defect fixing, drawing, induction heating quenching, heat treatment, oil, testing, packaging;

Process flow 2: hot rolled wire, detection, acid wash, eddy current inspection, defect repair, drawing, traditional heating quenching heat treatment, oil, testing, packaging;

Process flow 3: hot rolled wire, detection, acid washing, phosphating, heat hardening, heat treatment of induction heating, eddy current testing, oil painting, detection, packaging.

Using process a representative of the manufacturer is high frequency thermal refining and its joint ventures in Japan, adopting process 2 on behalf of the manufacturer is sugita and its joint ventures in Japan, three other domestic manufacturers use technological process.

From a purely technical point of view, the process is one of the most advanced. It can not only produce the regular strength grade quenching spring steel wire, but also produce the 2000MPa high strength coarse specification quenching spring steel wire.

In addition, there are three advantages, one is the shot peening method to remove iron oxide on the surface of the wire, can avoid the residual hydrogen in the process of pickling delayed fracture caused by steel wire, at the same time to realize the clean production of environmentally friendly;

The second is to remove the residual defects of the wire surface directly after the eddy current probe, which can avoid the lag faults caused by the defect of the steel wire, and save the steel.

Three is to use induction heating mode in coarse specifications quenching tempering spring steel wire, which can realize ultrafine grain steel, grain size of the finished wire would normally ASTM11 magnitude, while the traditional heating method in rough specifications quenching tempering spring wire grain size can only achieve largest ASTM7 magnitude.

Technological process, by contrast, the three will arrange in eddy current testing process after quenching tempering heat treatment the most is not science, there are two reasons: one is the surface defect will be genetic finished steel wires, easy increases the risk of delayed fracture caused by steel wire surface defects;

The second is to increase the material cost and management difficulty of the spring factory and increase the workload of the coiling workers.

2. Specification production technology:

In the high-end, fine specifications quenching tempering spring wire production process: hot-rolled wire rod - testing - acid - skinned - annealed heat treatment and pickling and phosphating and drawing to traditional heating quenching and tempering heat treatment testing, eddy current flaw detection - oil - packing.

The manufacturer of this process is the Japanese suzuki metal and sumitomo electrician;

In the end, thin specifications in quenching tempering spring wire production process: hot-rolled wire rod to detect to pickling, phosphating, drawing to traditional heating quenching and tempering heat treatment testing, eddy current flaw detection - oil - packaging.


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