Graphite mold casting uses graphite as a mold material to solidify the molten metal under high temperature and high pressure to form a casting. Graphite is widely used in various industrial sectors because it has the characteristics of high temperature resistance, high strength, corrosion resistance and good thermal conductivity. At present, there are nearly a thousand known graphite molds in the world, and my country produces about 200 kinds of various graphite molds, most of which are used to produce automotive parts and mechanical parts. Introduction to the graphite mold casting process:
Graphite mold casting process (Figure 1)
The graphite molds currently used in China are mainly integral cavity molds made of clay as the base material. This type of model is large in size, light in weight, and has good rigidity, but the processing accuracy is low, and it is easy to produce defects such as cracks or shrinkage holes. In order to improve its processing quality and reduce costs, people have come up with some improved models such as pressed sand molds or resin self-hardening sand molds and composite sand molds with glass fiber reinforced unsaturated polyester as reinforcement materials. These new models not only have high strength and rigidity but are also easy to process and form. Therefore, they have been widely used in the manufacture of complex parts such as automobile engine cylinder blocks and cylinder heads. In addition, there are composite models made of thermosetting resins. The advantages of this type of model are low cost and high surface finish and dimensional accuracy.
There are many methods for manufacturing graphite molds. From the perspective of molding, there are two types: integral and segmented. From the perspective of structural form, they can be divided into two types: vertical and horizontal. From the perspective of the pouring system, they can be divided into two types: internal gate and external gate. According to the purpose, they can be divided into different types such as precision molds and rough molds.
