皮尔格冷轧管机轧制过程工艺优化

Process optimization of Pilger cold rolling

针对高速皮尔格冷轧管机轧制过程中轧制力波动及峰值大的问题,基于有限元仿真的方法,提出皮尔格冷轧工艺优化方案。首先,以316L不锈钢为研究对象,建立皮尔格冷轧管机冷轧过程三维有限元模型,分析了皮尔格冷轧管机轧制过程管坯外径与轧制力变化;其次,系统分析了皮尔格冷轧的轧制过程中送进量、管坯转动角度及辊缝间隙等工艺参数对轧制力的影响;最后,优选合理工艺参数,降低轧制力峰值及波动量。研究结果表明:316L不锈钢管坯在进入压下段后,轧制力及管坯轧制应力急剧增大;正反行程轧制力峰值及轧制力波动量随送进量增加而增大;当回转角度增大时,正行程轧制力峰值逐渐减小,而反行程轧制力峰值则先减小后增大,波动量在保持稳定后急剧增大;当辊缝间隙过大时,轧制力峰值呈现先增大后减小的变化趋势,前后行程轧制力波动量趋于稳定;当正行程送进量为6 mm,反行程送进量为1.5 mm,回转角度为55°,辊缝间隙为2 mm时,轧制力峰值降低23%,波动量减小至100 kN。

The optimization project of pilger cold rolling was proposed based on finite element simulation in order to solve the problem of rolling force fluctuations and large peaks in the high-speed pilger cold rolling pipe mill.Firstly,316L stainless steel pipes were taken as the research object,and a three-dimensional finite element model of pilger cold rolling process was established.The variation of tube outside diameter and rolling force during rolling process of pilger cold pipe mill was discussed.Secondly,the influence of process parameters,such as feed rate,billet rotating angle and gap between roll seams on rolling force was systematically studied during the rolling process of pilger cold rolling.Finally,reasonable process parameters were suggested for reducing the peak and fluctuation of rolling force.The results show that the rolling force and rolling stress of 316L stainless steel tube billet increase sharply when the tube enters the reduction section.The peak value of rolling force and the fluctuation of rolling force in front and back stroke increase with the increase of feed amount.The peak value of positive stroke rolling force decreases gradually when the rotation angle increases,while the peak value of reverse stroke rolling force decreases first and then increases.The fluctuation of rolling force increases sharply after maintaining stability.Moreover,the peak value of rolling force shows a trend of increasing first and then decreasing when the gap between roll seams is too large.The fluctuation of rolling force in front and back stroke tends to be stable.When positive stroke feed is 6 mm,reverse stroke feed is 1.5 mm,rotation angle is 55° and gap between roll seams is 2 mm,the peak value of rolling force decreases by 23%,and fluctuation decreases to 100 kN.