Manufacturing process and testing of "Yongxing" steel ball
___
1. Raw material control

Raw materials and ferroalloys are accepted by bidding method, in accordance with the "Raw Materials and Processing Standards", processed into specifications that meet the process requirements, classified and stacked, and hung up signs to distinguish qualified and unqualified products.
2. melting control

We use medium frequency induction electric furnace for melting, and the materials added to each furnace must be accurately measured and qualified proportion; Ensure that the composition of each furnace of molten steel meets the requirements of the product. At the same time, far-infrared optical thermometer is used to control the temperature of each furnace of molten steel, and the spectral element analyzer is used to analyze and monitor the composition of each furnace molten steel before and after the furnace to ensure that various specifications of products meet the production requirements.
3. Chemical composition control

The chemical composition of "Yongxing" steel ball products gradually forms an optimized and scientific control curve in the production process, forming our company's unique chemical composition matching party, and studying the chemical composition of the grinding medium mainly makes it serve toughness and hardness to achieve an optimal state.
In order to improve the quality of "Yongxing" steel ball products, in the production, we for different working conditions and user requirements, the grinding body to select different material formulas, so that the chemical element composition in the best range, in addition to the conventional elements, we own developed two kinds of metamorphic agents, one is rare earths and other leading metamorphic agents, these metamorphic agents are very effective to adjust the toughness and hardness of the product and heat treatment phase change point.
4. the molding process control

The first feature: our casting molding process is unique, using metal mold to produce casting balls, during which we have solved many technical problems such as metal mold design, processing, mold ratio, material and so on.
The second feature: the local hardening process produced by casting metal molds into process carriers.
5. Heat treatment process and temperature control

The heat treatment process is the last process to ensure and improve product quality, and it is also a very important process. The good performance of "Yongxing" steel ball grinding medium must be fully reflected by the best heat treatment process, different materials, different products, different specifications, need different process curves to guarantee, so as to achieve the physical properties of the products we need.
Temperature control process is a very important and complex process in heat treatment production, especially the best temperature control that affects product quality, is a prominent problem that needs to be solved, different furnace temperature, pouring temperature, mold temperature, mold temperature and heat treatment temperature, can make the product from liquid to solid state sequential solidification casting process, to achieve a good state. If the pouring temperature is too low, it will cause insufficient shrinkage to form shrinkage and cold insulation casting defects; If it is too high, it will produce more network column crystals and damage the mold in the metallographic structure of the product.