| 摘要 |
PURPOSE:To prevent generation of blowby and to improve productivity by annealing a liner having a plating layer, pouring a molten metal to the inside circumference thereof an preheating the molten metal then pouring the molten so as to embed the liner by casting thereby forming a cylinder block integrated with a head and welding the liner. CONSTITUTION:A liner 2 having an annealed plating layer is mounted in a casting mold 3 for a cylinder block 1. A preheating chamber 1b contg. a molten metal 8 for preheating is provided on the inside circumference of the liner 2 and a melt 8 for preheating of the same metal as the molten metal for embedding by casting or the other metal having the higher melting temp. is poured through a sprue 3 for preheating into the chamber to preheat the liner 2 from the inside. A chiller 5 is provided in the uppermost part of the melt 8 to reduce the time for the casting operation. The molten metal for embedding by casting is poured through a normal sprue 3a at the point of the time when the liner 2 attains an optimum temp. The metal for embedding by casting is securely welded to the liner with diffusion reaction by increasing the time until said metal ends solidification. |
