全浮动芯棒钢管连轧过程芯棒与轧件的摩擦研究  

Research on the Friction between Mandrel and Workpiece during Tube Continuous Rolling by Full Floating Mandrel Mill

作　　者：齐秀美[1] 赵志毅[1] 苏惠超[2] 任学平[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]宝山钢铁股份有限公司宝钢分公司钢管厂,上海201900

出　　处：《应用基础与工程科学学报》2012年第1期64-73,共10页Journal of Basic Science and Engineering

摘　　要：应用有限元分析研究了8机架全浮动芯棒钢管连轧过程芯棒与轧件间的摩擦作用,揭示了该摩擦作用在轧制过程中的演变规律及其对连轧运动状态与电机能量分配的影响.结果表明,在第1—4机架的咬入过程中,毛管所受芯棒的摩擦作用从完全为负摩擦演变为正负摩擦共存,中性面随咬入的进行逐渐向接触区出口侧移动,且在第1机架中性面会完全移出接触区.在第5—8机架的咬入过程中,芯棒始终滞后于毛管,因而芯棒对毛管的摩擦作用均为负.稳定轧制阶段,芯棒在轴向受到的摩擦合力为零,其速度不发生变化.该阶段8个机架可以分为3类:其中1、2机架为滞后机架,第3机架为同步机架,4-8机架为导前机架.整个机组芯棒与毛管运动的中性面位于第3机架接触区,但在第2机架和第4机架接触区也存在芯棒与毛管速度相等的位置.芯棒在各机架的摩擦状态不同使其成为导前机架向滞后机架传递能量的工具.因此,第5-6机架在轧制能耗较低的情况下,电机仍保持较高的输出功率,而1、2机架的轧制能耗虽然较大,电机输出功率反而较小.The friction between mandrel and workpiece was investigated with coupled thermomechanical finite element analysis during tube continuous rolling by eight-stand full floating mandrel mill. The friction evolution and its influences on rolling movement state and motor energy distribution were revealed. The results showed that when the tube was entering 1 st--4th stands, the friction of the tube from the mandrel changed from entirely negative friction to the coexistence of negative and positive friction. The neutral plane moved towards the exit of the contact area gradually with the entering progressing, and it could move out the contact area at the 1st stand. When the tube was entering 5th--8th stands,the frictional force of the tube from mandrel was negative all the time as the mandrel always lags behind the tube. At the stable rolling stage, the frictional resultant force of mandrel from tube was zero, and thereby the mandrel velocity kept constant. At this stage, all the eight stands could be divided into three categories. The 1st and 2nd stands could be seen as lagging stands. The 3rd stand was synchronous stand and the 4th--8th stands were leading stands. The neutral plane between mandrel and tube of the whole unit was located in the contact area of the 3rd stand, but there were also planes existing in the contact areas of the 2nd and 4th stands, on which the mandrel velocity was equal to that of the tube. This friction difference of the mandrel in each pass made it a tool of energy transfer from leading stands to lagging stands. Therefore, on the condition of lower rolling consumption of 5th and 6th stands, the motors still kept higher output power. However, even though the rolling consumption of 1st and 2nd stands was higher, the motors of those stands only need to keep smaller output power.

关 键 词：全浮动芯棒 钢管连轧 摩擦 能量传递 

分 类 号：TG335.71[金属学及工艺—金属压力加工]