METHOD FOR CASTING CAST STEEL THROW FOR CRANK SHAFT MADE OF CAST STEEL

摘要

PROBLEM TO BE SOLVED: To provide a method for casting a cast steel throw for a crank shaft made of cast steel by which the occurrence of casting defects in a pin part can be reduced while making a cast steel throw into a near net shape in a casting stage, a period of time needed for the removal of working margins can be shortened by obtaining the near net shape and the cost can be reduced by the improvement of the yield of a product.;SOLUTION: In the internal space of a mold 2 where an inner surface is formed in such a manner that a feeder head 7 is arranged on a pair of arm pieces 3, 3 in the cast steel throw 1 to be cast in a state where intervals are made with a pin part 4, and working margin taper parts 5 each connecting the pin part 4 and the feeder head 7 and whose outer surface is tilted downward are respectively provided on the outer face sides of the arm pieces 3, 3 is packed with a molten metal, so as to cast a cast steel throw.;COPYRIGHT: (C)2008,JPO&INPIT