GF (glass fiber) is often needed to enhance the mechanical properties of PC materials in the actual production process of enterprises. As for the mold adopting the hot runner system, the wear of the nozzle of the hot runner system will be accelerated due to the addition of glass fiber in PC, resulting in a greatly reduced product qualification rate. This paper discusses the advantages of the hot runner system oftungsten carbide nozzlein the actual production aiming at the application of the hot runner system of tungsten carbide nozzle in the actual production. Mould is the basic industry of our country national economy, it is the important basic craft equipment of manufacturing industry. Mold manufacturing has an important position in the manufacturing industry, making the mold manufacturing capacity and technical level become an important standard to measure the national manufacturing level and innovation capacity. With the continuous progress of the society and the continuous development of the economy, a variety of commodities are produced continuously, most of which depend on the diversification of the mold. With the use of plastic products in society more and more extensive injection mold has become the most widely used mold type. With the continuous development of the society, people's requirements for environmental protection and plastic products are higher and higher. Therefore, mold adopting heat flow system should be born and widely used. The mold mainly adopts the hot runner system has the following advantages: (1) shortening the casting cycle. Because there is no restriction on the cooling time of the runner system, the parts can be produced in time after being formed and solidified. Many thin-walled parts produced by hot runner moulds can take less than 5 seconds to shape. (2) saving plastic materials. Because there is no cold runner in the pure hot runner mould, there is no production waste. This is particularly significant for reducing raw material costs. In fact, the main manufacturers of hot runner in the world are in the era of high prices of roommates and plastic raw materials have been rapidly developed. Because of the efficient way to reduce waste and cost of hot runner technology. (3) reduce waste and improve product quality. The temperature of plastic melt is controlled accurately in the system of hot runner mould. The plastic can flow into the cavities in a more uniform state to produce parts of uniform quality. In addition, the quality of the sprue is good, the residual stress is low and the deformation of the part is small. Therefore, many high quality products on the market are produced by hot runner mold. (4) eliminate subsequent processes, which is conducive to production automation. After the hot runner mold is formed, the finished product, without the need to trim the gate and recycle and process the cold runner, is conducive to the realization of production automation. (5) expand the scope of injection molding process application. Many advanced plastic forming processes are developed on the basis of hot runner technology.

The material of this product is PC, and glass fiber (GF) needs to be added to enhance the mechanical properties of the product. The product appearance cannot leave the mark of glue inlet, and the raw material of the product cannot be reused. It is well known that PC is a colorless or yellowish thermoplastic engineering plastic without fineness, odorless, non-toxic and high transparency. It has excellent physical and mechanical properties, good heat resistance and low temperature resistance, and stable mechanical properties and dimensional stability in a wide range of temperature. The most important processing method of this material is injection molding. When PC is using hot runner mould for injection molding, BECU is usually used for the material of the nozzle tip of hot runner. In general, no problems will occur in the production process. According to the requirements of the customer, the appearance of the product cannot leave gate marks and the raw materials cannot be reused, which decides that the mold should be designed and manufactured by using the hot runner system. Due to the influence of glass fiber added to PC material, the heat flow nozzle tip of the mold is made of BECU material. However, it was found in the production process that there was no problem with the products of the mold at the beginning of production. After a period of production, the products began to fail in large areas, and no obvious improvement was made after the equipment debugging. Thus it can be seen that the problem should be above the mold. It was found that the reason was that the nozzle tip of the hot flow nozzle was worn seriously, resulting in quality problems.

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