φ75mm GCr15圆棒材孔型工艺优化及数值模拟  

Process improvement and numerical simulation of φ75mm round bar pass design

作　　者：王青海[1] 孙世平 苟复钢 金启邦 年国恩 车巨龙 WANG Qing-hai;SUN Shi-ping;GOU Fu-gang;JIN Qi-bang;NIAN Guo-en;CHE Ju-long(Xining Special Steel Co.,Ltd.,Xining 810005,Qinghai,China;New Materials Co.,Ltd.,Xining Special Steel Group Co.,Ltd.,Xining 810005,Qinghai,China;Technology Center,Xining Special Steel Co.,Ltd.,Xining 810005,Qinghai,China)

机构地区：[1]西宁特殊钢股份有限公司,青海西宁810005 [2]西钢新材料有限公司,青海西宁810005 [3]西宁特殊钢股份有限公司技术中心,青海西宁810005

出　　处：《中国冶金》2021年第8期77-82,共6页China Metallurgy

摘　　要：西宁特钢精品小棒线在生产φ75 mm的GCr15热轧圆钢时,发现轧后棒材内部存在中心疏松缺陷,导致棒材精整后超声探伤合格率低。通过修改孔型参数,结合数值模拟研究测试棒材芯部应力及等效应变的变化情况,再经现场生产验证,结合成品棒材超声探伤合格率的分析,来验证优化后的孔型参数是否可行,指导现场生产实践,提高轴承钢棒材的产品质量水平。参数的确定中,对各道次压下量的重新分配,主要是增加了第2道次的压下量,从58增加到86 mm,减小了第4道次的压下量,从58减小到30 mm。优化后的工艺直接从11架出φ75 mm成品,节约了后2架轧机的能源消耗与轧辊磨损消耗。模拟结果显示第1道次的棒材内部应力由之前的拉应力变为压应力,结合轧制速度的降低,有利于提高棒材芯部质量。实际生产证明工艺优化后低倍质量显著提升,探伤合格率为96.37%,较之前提高3.63%。During the production of φ75 mm GCr15 hot-rolled round steel in Xining Special Steel′s high-quality small bar line, it was found that there was a center porosity defect in the bar after rolling, which resulted in a low pass rate of ultrasonic detection after the bar was finished. This study verified the optimized pass pattern by modifying the parameters of the round pass, combined with numerical simulation to study the changes in the stress and effective strain of the test bar core, and then verified by on-site production, and combined with the analysis of the qualified rate of ultrasonic detection of the finished bar to determine the appropriate process parameters and guide on-site production practices and improve the product quality level of bearing steel bars. In determining the parameters, the main measures were to increase the reduction of the second pass from 58 to 86 mm, and reduce the fourth pass from 58 to 30 mm. The optimized process directly produced φ75 mm finished products from 11 pass, saving the energy consumption and roll wear consumption of the latter two rolling mills. The simulation results showed that the internal stress of the bar in the first pass changed from the previous tensile stress to the compressive stress, combined with the reduction of the rolling speed, which was beneficial to improve the quality of the bar core. The actual production proved that after the process optimization, the pass rate of ultrasonic detection was 96.37%, which was 3.63% higher than before.

关 键 词：GCr15圆棒 数值模拟 压下量 等效应变 压应力 探伤合格率 

分 类 号：TG335.11[金属学及工艺—金属压力加工]