Tungsten carbide is becoming more and more popular in die field because of its high hardness, stiffness, wear resistance, red hardness and small expansion coefficient. Due to the high costs, it is mainly suitable for processing large quantities and high value-added products.

 

As a kind of high wear-resistant material, tungsten carbide is applied to refractory mold in two main forms in structure. One is the overall structure, that is, the whole mold is made of tungsten carbide materials. The advantage is that the processing technology is simple, but the structure cost is high as it will occur fracture scrap when the thickness is lower than a certain time.In addition, the toughness of tungsten carbide is very poor. So even when the thickness is about 50-70 mm, the fracture often happens before it starts to be used, resulting in scrap.

 

 

Another structure is split structure, the main purpose of this structure is to reduce the proportion of tungsten carbide in the mold, reducing the loss caused by fracture in the process of use. The thickness of most tungsten carbide sheets are between 10 and 16 mm, which have a certain strength and toughness. The process features are relatively complicated by using the whole board mosaic and gluing method.

 

In theory, the mold can be packed in the mold box in a standard way. There are no gaps between the various templates, pads, slips and the mold box. As a matter of fact, it can not be done, so it will still break easily when using. The abnormal scrap does not give full play to the advantages of tungsten carbide materials. Mold costs are often not reduced, but increased. So how to prevent this material from breaking in the course of use is the key to the application of this material in refractory mold industry.

 

Taking the flat mold as the research object, the application of bolt connection processing technology in the tungsten carbide die processing was discussed. By utilizing the high wear resistance of tungsten carbide and ingeniously solving the defects of poor toughness and easy fracture in use, the process reduces the consumption of mold tons, improves the internal and external quality of products and molding efficiency.