| 摘要 |
A casting breaking apparatus has an open top and bottom, and fixed and movable cutter supporting parts, fixed and movable cutter plates provided in the fixed and movable cutter supporting parts, and a number of ridged fixed and movable cutters provided on the fixed and movable cutter plates so as to project therefrom and having a mutually interfitting relationship. A cylinder is provided for moving the movable cutter plate towards and away from the fixed cutter plate, while sliding surfaces at both sides of the movable cutter supporting part and/or movable cutter plate advance or retreat along the inner surfaces of side plates. In this type of casting breaking apparatus, great toughness and wear resistance of the fixed cutter plate and/or fixed cutters are required. Hitherto, deposit welding has been used to produce a hard surface to the plates. In consideration of the above circumstances, in the invention, high-manganese steel is mixed in the fixed cutter plate and/or fixed cutters. This eliminates the need for deposit welding, and ensures toughness and wear resistance after casting of the fixed cutters. Also, the fixed cutters can be made into a structure which resists, loss of the fixed cutters can be avoided, and mixing of chips of high-manganese steel constituting the fixed cutters into a regenerated casting is eliminated. Also, quality deterioration of a regenerated casting is avoided. |
