楔横轧连杆制坯中心孔洞缺陷研究

Study on Center Void Defects of Connecting Rod Preforming in Cross Wedge Rolling

针对中心孔洞缺陷在楔横轧连杆制坯中的危害性问题,对其形成机理进行了研究。建立了楔横轧有限元模型,并对连杆在轧制变形过程中的等效应力、等效应变、损伤、第1主应力的变化进行了分析。结果显示:第1主应力是分析中心空洞缺陷形成的最佳观测场量。这给今后解决中心孔洞缺陷问题奠定了基础。

Aiming at the harmfulness problem of center voids defects of connecting rod preforming in cross wedge rolling, the mechanism of defects formation was researched. The finite element model of cross wedge rolling was established. And the variation of the effective-strain, the effective-stress, and the damage, the first principal stress was analyzed. The results show that the first principal stress is the best observation field of analyzing center voids defects formation, which lays a foundation to slove the problem of center voids defects.