我厂铸件中有很多薄长件如机架、车面及龙筋等,在机械加工过程中常发现铸件变形,经专用钻夹具加工带来很多困难,甚至可能造成报废。我厂从一九五四年一月份起参照苏联书籍上对于机床零件的热处理资料进行铸件定性试验,历时四月,得到初步的结果,本文仅就一般情况加以报导。 I have a lot of castings in the thin long pieces of machinery such as racks, car tires and tendons, etc., found in the machining process often found casting deformation, the special drill fixture processing brings many difficulties, and may even result in scrapped. I plant from January 1954 with reference to the Soviet Union books on the heat treatment of machine tool parts for qualitative qualitative test casting, which lasted April, to obtain preliminary results, this article only on the general situation to be reported.