Abstract: The effect of draft, cone angle and length of sizing belt of drawing die, and drawing speed on drawing stress and drawing surface accuracy of bearing steel GCr15 (1. 01% C, 1. 58% Cr) Φ11 mm rod coil has been analyzed. The optimization process for Φ11 mm rod coil cold drawing to Φ10. 2 mm rod is obtained, i. e. Φ11 mm rod coil (HB193)- isothermal spheroidizing annealing (at 785℃ for 4. 5 h → at 750 °C for 3 h) - cold drawing to 10. 4 mm rodde-stress annealing at 740 ℃ for 4. 5 h- cold drawing to Φ10. 2 mm rod products (HB205) ； the nice surface quality is obtained by using the process measures including with cold speed 35 m/min and drawing oil lubricant.

摘要： 分析了GCr15轴承钢(1.01%C,1.58%Cr)Φ11 mm线材的减面率、拉拔模角度和定径带长度,拉拔速率对拉拔应力和拉拔表面精度的影响。得出Φ11 mm盘条冷拉至Φ10.2 mm线材的优化工艺,即Φ11 mm线材(HB193)-等温球化退火(785℃4.5 h→750℃3 h)-冷拔至中10.4 mm盘条-740℃4.5 h去应力退火-冷拔至Φ10.2 mm棒材成品(HB205);冷拔速度35 m/min,油性润滑等工艺措施可获良好的表面质量。

关键词: GCr15轴承钢线材, 联合拉拔机, 冷拔, 减面率, 模具, 应力, 等温球化退火, 润滑