| 摘要 |
<p>PURPOSE:To make smooth the interior of a hollow part and make unnecessary internal finishing, by covering the outer surface of metal core near the ingate with chromium coating. CONSTITUTION:An ingate 9 communicating with a runner 8 is formed in a casting space at flywheel side X, with respect to a crankshaft mold 7, and the outer surface of a hollow main body B positioned in the journal part 1 nearest to this ingate 9 is covered with chromium coating. Metal bar bodies 5 are inserted in small-diameter tubular parts 4b, 4b of the metal core 4. The shaft center P2 of this core main body B is set in the mold 7, concentrically to the crankshaft center P, while the other core main bodies B... are covered with copper on the outer surface, and set in the mold 7, with the shaft center P2 placed concentrically to the crankshaft P in the journal part 1 and the shaft center P2 concentrically to the pin shaft center P3 in the crank pin parts 3, 3. Thus, casting is performed with ductile cast iron, with the molten metal covering the core 4 next to the ingate 9 with inner chill.</p> |
