| 摘要 |
PROBLEM TO BE SOLVED: To provide a method by which a finish-polishing in a producing process of a die for forming of a plastic etc., and a tool for cold working of a working tool etc., is easily performed, that is, high mirror-finishing of the surface can be performed with high accuracy by polishing for a short time. SOLUTION: In a quenching method in the producing method for tool for cold-working, by which a tool blank is worked to form the tool for cold- working, and after roughly grinding, the quenching and a tempering are applied and further, the finish-polishing is performed, the quenching is performed in the range surrounded with A(1×10<SP>-5</SP>Pa, 5×10<SP>4</SP>), B(1×10<SP>-2</SP>Pa, 6.3×10<SP>4</SP>), C(2×10<SP>-1</SP>Pa, 5.2×10<SP>4</SP>), D(1×10<SP>-4</SP>Pa, 4×10<SP>4</SP>) and E(1×10<SP>-5</SP>Pa, 4×10<SP>4</SP>) in figure 1 in the case of using the horizontal axis of coordinate as vacuum degree of the vacuum furnace for heating for quenching and the vertical axis for T(logt+37). Wherein, T: the absolute temperature of the quenching temperature and t: time for holding to the quenching temperature. COPYRIGHT: (C)2004,JPO
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