| 摘要 |
PURPOSE:To prevent the generation of the deformation at the time of precipitation hardening without impairing formability by subjecting the titled alloy plate performed a solution heat treatment to a heat treatment while giving it specific tensile stress under the condition in a relationship between the specific treatment time and temp. CONSTITUTION:The precipitation hardening copper alloy plate such as a Be-Cu alloy plate, etc., is applied to the solution heat treatment, or after that, is furthermore cold rolled. The heat treatment is executed to the copper alloy under the conditions within the area surrounded by the lines of A B C D expressed by y=285+40/(x+0.15), y=404-11.6x, y=338+74.88/(x-0.6), y=470, more preferably under the conditions within the area surrounded by the lines of E F G H I expressed by y=290+80/(x+0.2), y=320, y=403-20x, y=325+80/(x+0.1), y=460 on a graph where the x axis denotes the treatment time (by min) and the y axis denotes the treatment temp. (by deg.C) while giving it the tensile stress of 3-40kgf/mm<2>. By this method, the products having good dimensional accuracy is obtd. at low cost in a good yield impairing the formability.
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