Double-layer structure casting machining process

The invention relates to the technical field of investment casting, in particular to a double-layer structure casting machining process. The double-layer structure casting machining process guaranteesthe product quality and comprises casting structure optimization, pouring system optimization and shell manufacturing process optimization, and the casting structure optimization comprises the following steps that (1) a casting process hole is formed in a part, and an assembly positioning step is made; (2) a cover used for sealing the casting process hole is manufactured, and a welding groove matched with the assembling positioning step is formed in the cover; (3) the cover is assembled on the casting process hole and welded; and (4) the protruding position of the welding groove is trimmed. Apouring system is optimized in the mode that the group number of pouring gates are designed into an integrated special pouring gate; The shell manufacturing process optimization comprises the following steps: (1) filling sand