| 摘要 |
PROBLEM TO BE SOLVED: To solve such the problem that, conventionally, when heat treatment conditions for stabilizing the dimensions of a cylinder block are set, there are many restrictions, and an condition setting operation is made complicated. SOLUTION: There is provided the heat treatment condition setting method which is used when a workpiece 2 made of an aluminum alloy is heated to a prescribed heat treatment temperature H and is subjected to heat treatment. The heat treatment conditions are set, in a temperature raising period where the temperature of the workpiece 2 is raised from a quality change start temperature HO as a heat treatment start temperature to the heat treatment temperature H, using a temperature difference between the quality change start time H0 and the heat treatment temperature H, and a time t1 for the temperature raising period, and, in a temperature holding period for which the temperature of the workpiece 2 raised up to the heat treatment temperature H is held to the heat treatment temperature H, using a temperature difference between the quality change start temperature H0 and the heat treatment temperature H, and a time t2 of the temperature holding period. COPYRIGHT: (C)2011,JPO&INPIT |
