Patent ID: 6671943
Filing Date: 2004-01-06
Classification: C23C,F05C,Y10T

Abstract:
A method of manufacturing a piston body for sliding within a cylinder, the piston body being formed of an aluminum alloy and having at least one ring groove encircling an outer periphery of the piston body, which method comprising the steps of:forming in the piston body a first groove which is broader than said ring groove and which encircles the outer periphery of the piston body; spraying a granular spraying material, containing at least particles of a carbon steel and 10 to 50 wt % of particles of an aluminum alloy containing 15-20 wt % silicon, into said first groove in a direction which is perpendicular to the outer periphery of the piston body so that said particles collide with a base in the first groove in a semi-fusing condition and form at least disks of said carbon steel and disks of said aluminum alloy disposed one on another in the first groove in a direction along the depth of the first groove, to form a sprayed layer; and forming the ring groove within said sprayed layer by grinding or cutting said sprayed layer in a direction which is perpendicular to said outer periphery of said piston body, said ring groove having an inner side surface composed of thin elliptic cut surfaces of said disks of said carbon steel and said disks of said aluminum alloy.