Thermal-force driving of roll profile electromagnetic control technology(RPECT),which can be used to adjust the roll profile,can be affected by the sequential temperature rise between the electromagnetic stick(ES)and ...Thermal-force driving of roll profile electromagnetic control technology(RPECT),which can be used to adjust the roll profile,can be affected by the sequential temperature rise between the electromagnetic stick(ES)and electromagnetic control roll.Due to the limited space of ES and induction coil,the cross-sectional area of induction coil can be inevitably affected by changing the size of the ES induction zone,which can further change the energy input under the same electromagnetic parameters,the temperature rising effect and the bulging ability.To investigate this phenomenon,the effects of the radius of the induction zone on the thermal-force contribution ratio,the heating ability of ES and the temperature distribution were analyzed through an electromagnetic-thermal-structural finite element model.To ensure that the results are applicable to RPECT,the thermal energy conversion ability and thermal-force roll crown control ability under different lengths of the induction zone were analyzed.It was found that whether the current density regulation mode or the current frequency regulation mode is adopted,the cases with 20 or 25 mm radius of the induction zone have the great thermal energy conversion ability and the good thermal-force roll crown control ability.The reasonable adjustment of the length of the induction zone can reduce the radius required for the maximum energy efficiency regulation.Combined with the results of the simulation analysis,the optimization of ES based on the control ability maximization requirement is achieved,which provides the base for the design and configuration of ES in RPECT.展开更多
近年来,激光表面处理技术在轧辊表面处理上应用广泛,文中以轧辊为主要对象,研究激光熔覆工艺在棒材轧辊表面的应用,并对激光熔覆工艺参数进行了讨论。针对激光修复轧辊加工过程中,熔覆质量难以控制的问题,采用改变激光功率、扫描速度、...近年来,激光表面处理技术在轧辊表面处理上应用广泛,文中以轧辊为主要对象,研究激光熔覆工艺在棒材轧辊表面的应用,并对激光熔覆工艺参数进行了讨论。针对激光修复轧辊加工过程中,熔覆质量难以控制的问题,采用改变激光功率、扫描速度、送粉率等激光熔覆工艺参数的方法,通过试验得出工艺参数在激光功率3.7 k W、扫描速度6 mm·s-1、送粉量19 g·min-1、搭接系数在40%时,激光的熔覆效果最好。对修复好的轧辊跟踪作业,单槽轧钢量较熔覆前提高了近1倍,经济效益可观。展开更多
The electromagnetic control roll(ECR)and electromagnetic stick(ES)are the core elements and the main driving parts of roll profile electromagnetic control technology(RPECT).To prolong the service life,it is necessary ...The electromagnetic control roll(ECR)and electromagnetic stick(ES)are the core elements and the main driving parts of roll profile electromagnetic control technology(RPECT).To prolong the service life,it is necessary to treat ECR and ES surfaces.According to the heterogeneous characteristics of surface treatments,the roll profile electromagnetic control characteristics were analyzed for different parameters.An electromagnetic-thermal-force coupled axisymmetric finite element model was built to explore the differences in performance as a result of several treatment strategies,and the model was verified by experimental results measured with a roll profile electromagnetic control experimental platform.This model was used to analyze the influence of the heterogeneity of ECR inner hole and ES on the roll crown,the roll profile,the average contact pressure,and the stress state during RPECT process.The results indicate that the heterogeneous layer at ECR inner hole has a restrictive effect on RPECT and that the heterogeneous layer of ES can enhance the profile control ability of RPECT.A reasonable configuration scheme between the heterogeneity of ECR inner hole and the ES can increase the life of ECR and maintain the control ability of RPECT.展开更多
基金This work was supported by the National Natural Science Foundation of China(Grant Nos.U1560206 and 51975510)the Natural Science Foundation of China in Hebei Province(Grant No.E2021203129).
文摘Thermal-force driving of roll profile electromagnetic control technology(RPECT),which can be used to adjust the roll profile,can be affected by the sequential temperature rise between the electromagnetic stick(ES)and electromagnetic control roll.Due to the limited space of ES and induction coil,the cross-sectional area of induction coil can be inevitably affected by changing the size of the ES induction zone,which can further change the energy input under the same electromagnetic parameters,the temperature rising effect and the bulging ability.To investigate this phenomenon,the effects of the radius of the induction zone on the thermal-force contribution ratio,the heating ability of ES and the temperature distribution were analyzed through an electromagnetic-thermal-structural finite element model.To ensure that the results are applicable to RPECT,the thermal energy conversion ability and thermal-force roll crown control ability under different lengths of the induction zone were analyzed.It was found that whether the current density regulation mode or the current frequency regulation mode is adopted,the cases with 20 or 25 mm radius of the induction zone have the great thermal energy conversion ability and the good thermal-force roll crown control ability.The reasonable adjustment of the length of the induction zone can reduce the radius required for the maximum energy efficiency regulation.Combined with the results of the simulation analysis,the optimization of ES based on the control ability maximization requirement is achieved,which provides the base for the design and configuration of ES in RPECT.
文摘近年来,激光表面处理技术在轧辊表面处理上应用广泛,文中以轧辊为主要对象,研究激光熔覆工艺在棒材轧辊表面的应用,并对激光熔覆工艺参数进行了讨论。针对激光修复轧辊加工过程中,熔覆质量难以控制的问题,采用改变激光功率、扫描速度、送粉率等激光熔覆工艺参数的方法,通过试验得出工艺参数在激光功率3.7 k W、扫描速度6 mm·s-1、送粉量19 g·min-1、搭接系数在40%时,激光的熔覆效果最好。对修复好的轧辊跟踪作业,单槽轧钢量较熔覆前提高了近1倍,经济效益可观。
基金This project is supported by the National Natural Science Foundation of China(Grant Nos.U1560206 and 51975510).
文摘The electromagnetic control roll(ECR)and electromagnetic stick(ES)are the core elements and the main driving parts of roll profile electromagnetic control technology(RPECT).To prolong the service life,it is necessary to treat ECR and ES surfaces.According to the heterogeneous characteristics of surface treatments,the roll profile electromagnetic control characteristics were analyzed for different parameters.An electromagnetic-thermal-force coupled axisymmetric finite element model was built to explore the differences in performance as a result of several treatment strategies,and the model was verified by experimental results measured with a roll profile electromagnetic control experimental platform.This model was used to analyze the influence of the heterogeneity of ECR inner hole and ES on the roll crown,the roll profile,the average contact pressure,and the stress state during RPECT process.The results indicate that the heterogeneous layer at ECR inner hole has a restrictive effect on RPECT and that the heterogeneous layer of ES can enhance the profile control ability of RPECT.A reasonable configuration scheme between the heterogeneity of ECR inner hole and the ES can increase the life of ECR and maintain the control ability of RPECT.
