Basic concept of precision casting: It includes investment casting, ceramic mold casting, metal mold casting, pressure casting, and lost foam casting. One of the most commonly used is investment casting: selecting suitable investment materials to manufacture honing machine investment molds; Repeat the coating and sanding process on the mold, harden the mold shell and dry it; Dissolve the internal mold to obtain the mold cavity; Bake the shell to obtain sufficient strength, burn off residual investment materials, and pour the required metal materials

Measures to avoid porosity in casting include controlling the gas content of the molten metal, and minimizing the dissolution of gas elements into the molten metal during melting. This mainly depends on the raw materials used, reasonable melting operations, and appropriate melting equipment...

As the main structural component of the machine tool, the bed bears various static and dynamic loads during the working process; And connected to the foundation of the factory building through anchor devices. The stress situation is complex, requiring high requirements for rigidity and dynamic characteristics. Therefore, it is necessary to analyze the structure and dynamic characteristics of the bed components during the design process.

Tools, workpieces, and accessories are placed neatly; Complete safety protection devices; Pipeline integrity

According to the production statistics of major casting producing countries worldwide in 2004, the top ten casting producing countries can be divided into two categories. One type is developing countries, which have high production but low added value of castings, many small enterprises, a large workforce, and a significant proportion of black metals. The other type is developed countries such as Japan, the United States, and Europe, which mainly produce high value-added castings using high-tech.

Ductile iron castings have been widely used in the field of large-scale mold casting and are one of the commonly used production processes for rough parts. With the rapid development of the automotive industry, the demand for equipment molds has been increasing year by year, and the impact of casting defects has gradually become prominent. Common defects include wrinkling, deformation, shrinkage, sand inclusion, and carbon deposition. This article mainly studies the shrinkage defects of ductile iron castings.