| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing a valve plate where, even if the valve plate has a complicated shape, its shape can be obtained by hot die forging, its quality such as strength, wear resistance, seizure resistance or the like can be improved, further, not only a hole with a complicated shape can be molded, but also, the molding can be performed to a state close to the almost final shape in a short time, the reduction of cost can be realized by the remarkable reduction of the number of stages, further, since only a copper alloy is used, its recycling is more easier than the case of a bimetal as a composite material. SOLUTION: A copper alloy having a composition comprising, by mass, 20 to 45% Zn, and further comprising one or more elements selected from 0.5 to 6% Mn, 0.5 to 4% Si, 0.01 to 2% Sn, 0.01 to 5% Pb, 0.01 to 4% Bi, 0.01 to 3% Fe, 0.01 to 5% Ni, 0.01 to 3% Co, 0.01 to 3% Ti, 0.01 to 2% Mo, 0.01 to 1% Cr, 0.01 to 2% Zr, 0.01 to 1% Nb and 0.01 to 1% V, and the balance Cu with inevitable impurities is used as the stock, and is subjected to hot forging, and, by the hot forging, its shape is finished. COPYRIGHT: (C)2008,JPO&INPIT
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