Preparation of molding sand - shaping - fitting - pouring - cooling - sand dropping - cleaning - inspection - heat treatment - inspection - obtaining castings

Characteristic: The method of using sand to form a mold and pouring it, usually referring to the sand casting process under the action of gravity.

The molding (core) methods can be divided into two categories based on the degree of mechanization: manual molding (core) and machine molding (core).

Choosing the appropriate molding (core) method and the correct molding (core) process operation are of great significance for improving casting quality, reducing costs, and increasing productivity.

(1) Handmade modeling (core) 

Manual molding (core) is the most basic method, which has a wide range of applications, does not require complex equipment, and the molding quality can generally meet the process requirements. Therefore, so far, manual molding (core) still accounts for a large proportion in single piece and small batch production casting workshops. Widely used in the fields of aviation, aerospace, and navigation. Handmade molding (core) has high labor intensity, low productivity, and unstable casting quality, which largely depends on the technical level and proficiency of workers. There are many manual modeling methods, such as shape modeling, scraper modeling, and pit modeling. Each modeling method has different characteristics and application ranges.

(2) Machine design (core)

Using machines to complete all or part of the molding process is called machine molding. Compared with manual molding, machine molding has higher production efficiency, stable quality, lower labor intensity, and does not require as high technical requirements for workers as manual molding. It takes longer production preparation time and is generally suitable for two box molding on one parting surface. Machine modeling (core) is mainly suitable for large-scale production of black metal castings.