In recent years, valve manufacturers have paid more and more attention to the appearance quality and dimensional accuracy of castings. Because good appearance is the basic requirement of the market, it is also the positioning benchmark for the first machining process.
The commonly used precision casting in the valve industry is investment casting, which is briefly introduced as follows:
(1) Two process methods of investment casting:
①Using low-temperature wax-based mold material (stearic acid + paraffin), low-pressure wax injection, water glass shell, hot water dewaxing, atmospheric smelting casting process, mainly used for carbon steel and low-alloy steel castings with general quality requirements, The dimensional accuracy of castings can reach the national standard CT7-9.
②Using medium-temperature resin-based mold material, high-pressure wax injection, silica sol mold shell, steam dewaxing, rapid atmospheric or vacuum melting and casting process, the dimensional accuracy of castings can reach CT4-6 precision castings.
Post time: Oct-28-2022