论文部分内容阅读
电磁铆接放电电压是影响铆钉变形的重要参数。在不同铆模工艺试验的基础上确定最佳成形铆模,从宏观和微观角度研究放电电压对TB3钛合金铆钉变形的影响。结果表明,铆模对铆钉变形有重要影响,不同铆模成形的铆钉质量不同。采用50°铆模,在190V~230V电压下,随着放电电压升高,铆钉镦头高度减小,钉杆直径增加。在剪切带内,晶粒被急剧拉长,剪切带内外晶粒差别较大;随着放电电压升高,铆钉镦头内部主剪切带越来越明显,剪切带宽度越来越小。TB3铆钉以产生形变带的方式发生绝热剪切变形。
Electromagnetic riveting discharge voltage is an important parameter affecting the deformation of rivets. The optimum forming rivets were determined on the basis of different riveting die technology tests. The influence of discharge voltage on the deformation of TB3 titanium alloy rivets was investigated from macroscopic and microscopic perspectives. The results show that the rivet die has an important influence on the deformation of the rivet, and the quality of the rivet formed by different rivets is different. With 50 ° riveting die, under the voltage of 190V ~ 230V, as the discharge voltage is increased, the height of rivet heading head is reduced and the diameter of nail rod is increased. In the shear zone, the grains are sharply elongated, and the difference between the grains inside and outside the shear zone is large. With the increase of the discharge voltage, the main shear zone inside the rivet head is more and more obvious, and the shear band width is more and more small. The TB3 rivets undergo adiabatic shear deformation in a way that creates strain bands.