| 摘要 |
<p>A ring-shaped plate member (6) of a three-layer structure having an aluminium alloy material (8) disposed on the opposite sides of a copper alloy material (7) is formed by casting in the outer peripheral part (2) of a piston (1) made of an aluminium alloy where a piston ring groove (3) is to be formed. The ring-shaped plate member (6) and the piston (1) are joined integrally by remelting locally the junction part of the aluminium alloy material (8) of the ring shaped plate member (6) and the piston (1) by applying an electron beam thereto. Thereafter the piston ring groove (3) is formed in the copper alloy material (7) of the ring-shaped plate member (6). By this method, the piston for an internal combustion engine, such that the part of a hardened layer forming the piston ring is prevented from adhering to the piston ring and the hardened layer is prevented from cracking, is provided.</p> |
