The construction of a new type anti-pitting tappet with a cast hole in its end face and isothermally treated are described.
介绍了端面直接铸孔并进行等温处理的新型抗点蚀挺杆体的结构和热处理工艺；
The reason of the formation of gas porosities and cracks on the head face of valve tappet has been studied.
本文分析了气门挺杆端面气孔、裂纹形成原因。
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