In view of the current situation that the production quality of large and complex integral stainless steel casting impeller can not be guaranteed or even produced by single investment casting or sand mold casting process, a new idea of using investment mold sand mold composite casting process to solve this problem is put forward. The research contents mainly include:
a. Study on preparation technology of partial investment casting shell of impeller blade
It mainly includes: molding design, mold material selection, and pressing the investment mold of a single blade that meets the requirements; The integral investment molding process of welding the fusion module of a single blade into the blade part; Coating, hardening, dewaxing and roasting process of ethyl silicate water glass composite coating.
b. Study on composite molding process of impeller investment casting sand casting
It mainly includes: Design of process parameters of composite mold; Sand mold process design of impeller spoke and hub; Study on the compound molding process of impeller investment casting sand casting.
c. Melting and pouring of zg1cr18ni9ti cast stainless steel
It mainly includes: zg1cr18ni9ti stainless steel melting process; Study on pouring process of zg1cr18ni9ti stainless steel.
d. Post treatment of impeller casting
It mainly includes: sand falling of impeller casting, cutting of pouring and riser and heat treatment process of zg1cr18ni9ti impeller casting.
e. Inspection and process analysis
It mainly includes: chemical composition inspection, appearance quality inspection of impeller, ultrasonic inspection of impeller hub, rim and spoke, observation of tissue structure, test and analysis of mechanical properties.
Through the research on the above contents, the purpose is to explore the investment mold sand mold composite casting process of this kind of impeller, so that the enterprise can obtain impeller castings with excellent quality that meet the technical requirements under the existing production conditions, and explore new ideas for the production of similar casting blanks.