Improper operation in the spring production process is very easy to produce pitting, so that the product surface rough, affecting the quality of the product. These pitting point size, distribution location is different. General pitting is caused by steel in the extrusion process, when pitting should be timely adjusted extrusion speed, to avoid more pitting. Hao xin steel wire combined with years of experience in spring production, analysis and summary of the following reasons:

1. Influence of excessive impurities in raw materials. In the raw material contains too much non-metallic impurities, because the non-metallic impurities particles are large, and there is no stable crystal structure, in the steel oxide coating, it is easy to appear defects, serious will appear pitting;

2. Excessive force in the extrusion process. In order to achieve the extrusion effect, different kinds of tools are generally used to extrude the steel wire. The degree of cooperation between the extrusion pad and the extrusion barrel is also the reason for the pitting of the product. The production of these pitting points reduces the performance and appearance flatness of the product.

Through the above analysis can be seen to produce a good quality spring steel wire raw material quality is very important, at the same time to understand the control of the product in the extrusion gap, so as to effectively reduce the frequency of pitting.