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一、试验目的：花键孔热处理(渗碳淬硬)后,因清除氧化皮等原因,表面光洁度不高；以及由于热处理引起收缩变形的问题
First, the purpose of the test: After the spline hole heat treatment (carburizing hardened), due to the removal of oxide scales and other reasons, the surface finish is not high; and the problem of shrinkage due to heat treatment