Precision Casting Process of Modern Machinery Manufacturing Industry investment precision casting precision casting parts

Casting: It is the process of melting metal into liquid that meets certain requirements and pouring it into a mold, and then cooling, solidifying, and cleaning to obtain a casting (parts or blank) with a predetermined shape, size, and performance. It is the basic process of the modern machinery manufacturing industry.

The cost of blanks produced by casting is low, and it can show its economy for parts with complex shapes, especially those with complex inner cavities; at the same time, it has a wide adaptability and good comprehensive mechanical properties.

There are many materials (such as metals, wood, fuel, modeling materials, etc.) and equipment (such as metallurgical furnaces, sand mixers, molding machines, core making machines, sand dropping machines, shot blasting machines, cast iron plates, etc.) required for casting production, and dust, harmful gases and noise will be generated to pollute the environment.

There are many types of casting, which are usually divided into:

① Ordinary sand casting, including three types of wet sand, dry sand and chemical hardening sand.

② Special casting, according to the molding materials, can be divided into two categories: special casting with natural mineral sand and stone as the main molding materials (such as investment casting, clay casting, foundry shell casting, negative pressure casting, solid casting, ceramic casting, etc.) and special casting with metal as the main casting material (such as metal mold casting, pressure casting, continuous casting, low pressure casting, centrifugal casting, etc.).

The casting process usually includes:

① Preparation of casting mold (container for liquid metal to become solid casting). Casting mold can be divided into sand mold, metal mold, ceramic mold, clay mold, graphite mold, etc. according to the materials used. It can be divided into disposable mold, semi-permanent mold and permanent mold according to the number of times used. The quality of casting mold preparation is the main factor affecting the quality of casting;

② Melting and pouring of casting metal. Casting metal (casting alloy) mainly includes cast iron, cast steel and cast non-ferrous alloy;

③ Casting processing and inspection. Casting processing includes removing foreign matter from the core and casting surface, cutting off the pouring head, grinding burrs and seams and other protrusions, as well as heat treatment, shaping, rust prevention and rough processing.