машин ашиглан ногоон элс цутгах
цутгамал төмрийн холбох хэрэгсэл элс цутгах. Production technology of cast iron pipe fittings sand casting 1 Sand casting introduction Sand casting is used to make large parts Molten metal is poured into a mold cavity formed out of sand The cavity in the sand is formed by using a pattern which is