采用化学、金相分析等方法对质量异议提出的裂纹缺陷进行了分析，结果认为，料温偏低和设计中分型模在该区的过渡弧角过小，引起金属流线的交叠错动，是产生折叠缺陷的原因。
Chemical composition Analysis，metallurgical analysis and other method were used to analyze the crack fault of 40Cr sliding fork. The results showed that heating temperature of workpiece was on the low side, and that transition arc angle of undercut moulding in this area in design ,which lead to blend moving of Metal Streamline ，were the major reason of causing dopplung fault.
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