Introduction to Hot Die Casting Process for Industrial Special Ceramics

Hot press casting, also known as hot press injection molding, is the process of filling a metal mold with melted wax containing slurry (wax slurry) under pressure, cooling and solidifying it in the mold, and then demolding.

1. Characteristics of hot pressing injection molding: Hot pressing injection molding is a widely used production process for special ceramics. Its basic principle is to use the melting and solidification characteristics of paraffin wax when heated and cooled, to uniformly mix non plastic poor ceramic powder with hot paraffin liquid to form a flowable slurry, which is injected into a metal mold under a certain pressure for molding. After cooling and solidifying the wax slurry, the molded body is removed from the mold. The blank is appropriately trimmed, buried in adsorbent and heated for dewaxing treatment, and then the dewaxed blank is sintered into the final product.

2. Application of hot die casting: This method produces products with accurate dimensions, high smoothness, and compact structure, which are widely used in the manufacturing of industrial ceramic products. Some ceramic daily necessities are currently being tested using hot pressing injection molding, and hot pressing injection molding production lines have also emerged abroad. Hot pressing injection molding is becoming one of the new methods for the development of daily ceramic molding.

Principle of hot press injection process: The hot press injection machine used is a compressed air hot press injection machine that pressurizes the wax slurry with compressed air. It uses a constant temperature sealed slurry bucket and compressed air to send wax slurry into the injection mold. Before forming, place the melted and hot pressed wax slurry into a slurry barrel and heat it with electricity to reach the required temperature. The outside of the slurry bucket is an oil bath bucket that maintains a constant temperature. A node thermometer is inserted into the bucket and a relay is connected to control the temperature. When forming, align the inlet of the mold with the outlet of the injection machine, press the compressor valve and the top pole of the grouting device to press the mold tightly, and at the same time, compressed air enters the grouting bucket to press the slurry into the mold. After a short period of time, stop feeding the slurry and discharge the compressed air. Open the mold, take out the hardened billet, use a small knife to cut off the injection port and inject the material, and after trimming, obtain a qualified green billet.