Patent ID: 6532655
Filing Date: 2003-03-18
Classification: B21K,B23P,F04B,Y10T

Abstract:
A method of manufacturing a hollow piston for variable displacement swash plate compressors, comprising:separately forming a body and a cap, said body comprising a bridge part, with a hollow cylindrical head part and a grip part being formed at both sides of said bridge part, and said cap comprising a hollow cylindrical head part and a grip part formed at both sides thereof; cutting end surfaces of said head parts of both the body and the cap, thus forming junction surfaces at said end surfaces of the head parts; integrating the body and the cap into a piston member by frictionally welding the junction surfaces together while forcing the body and the cap toward each other with the body and the cap being held by jigs at their grip parts; cutting a side surface of said piston member while holding the piston member using a jig, thus primarily forming a side surface of a piston head; forming an abrasion resistance layer on said side surface of the piston head; polishing the side surface of the piston head, thus finally forming a desired side surface of the piston head; cutting said bridge part of the body of the piston member at a predetermined portion, thus forming a swash plate seating recess with a shoe recess, said shoe pocket being formed by cutting a sidewall of the swash plate seating recess at diametrically opposite portions so as to form concave surfaces at said diametrically opposite portions; and removing the grip parts from both ends of the piston member, thus forming front and rear end surfaces of a resulting piston.