... casting 2.Gravity pouring 3.CNC, Machining Center 4.Inspected by CMM 5.Smooth surface, ... Ra1.0;5. Dilled and reamed holes with Machining center ;6. 2 pcs of inner sealed grooves ... ring flange , electromagnetic steel cover, piston, pressure plate, center plate, wear plate, cylinder, impeller, disc etc.3. ... out during the whole process of manufacture with the assistance of computer and other material ...