| 摘要 |
PROBLEM TO BE SOLVED: To secure quenched hardness over the whole body of a part for wheel, in the part for wheel obtained by simultaneous forming and quenching of a steel plate. SOLUTION: In a method for simultaneously forming and quenching the steel plate of alloy steel or carbon steel by heating the plate to austenzing temperature and press-forming it while being held in a die and cooled, in order to secure the quenching hardness of a gear part 13 or a pushing-out hole 12 having difficulty to be quenched to sufficient hardness and being depth-worked, the quenchability of the steel plate of the alloy steel or the carbon steel is specified to >=1.8 inch ideal critical diameter DI.
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