数控车床卡爪断裂原因分析

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关键词：卡爪；马氏体；硬度；非金属夹杂DOI ：10.26915/j.issn1003-0514.2025.05.007中图分类号：TG115.2 文献标识码：B 文章编号：1003-0514（2025）05-0025-03

ResearchoncausesofCNClathechuckjawfracture

Dong Yuming1，2，Zhao Hongyun 1，2 ，Lv Jingyan 1，2 （1.Dalipal Pipe Company，Cangzhou O61OOo，Hebei，China； 2.Hebei Province Petroleum Special Pipe Technology Inovation Center，Cangzhou O610oo，Hebei，China）

Abstract：Inacertaincompany，thechuck jaws ofCNC lathes fractured during use.Thecausesof chuck jaw fracture were analyzed by means of macroobservation，chemical composition analysis，hardness testing，scaning electron microscopy （SEM）analysis，and metalographic examination.Theresults show that thehigh carboncontentin theCNClathechuck jaws， insuffcient tempering afterquenching leading to excessively high hardnessand inclusions （numerous inclusions）inthe materialcaused thechuck jaws tofirstcrack atthe stressconcentration area during useand thenthecracks propagated to the entire fracture.

Keywords：chuck jaw；martensite；hardness；non-metallic inclusion

数控车丝机是油套管加工螺纹专用车丝机，通过机床滑桶、拐臂和卡爪同步动作，完成管子夹紧和松开的动作，卡爪的使用频次较高，日常需要按照计划查看卡爪表面磨损情况，及时更换。（剩余1833字）