calendaring molding压延成形cold chamber die casting冷式压铸cold forging冷锻compacting molding粉末压出成形compound molding复合成形compreion molding压缩成形dip mold浸渍成形encaulation molding注入成形extrusion molding挤出成形foam forming发泡成形forging roll轧锻gravity casting重力铸造