The isothermal extrusion process of hollow aluminium profile was investigated using incremental proportional-integral-derivative(PID)control algorithm and finite element simulations.The range of extrusion speed was de...The isothermal extrusion process of hollow aluminium profile was investigated using incremental proportional-integral-derivative(PID)control algorithm and finite element simulations.The range of extrusion speed was determined by considering the maximum extrusion load and production efficiency.By taking the optimal solution temperature of the secondary phase as the target temperature,the extrusion speed–stroke curve for realizing the isothermal extrusion of the aluminium profile was obtained.Results show that in the traditional constant extrusion speed process,the average temperature of the cross-section of the aluminium profile at the die exit rapidly increases and then slowly rises with the increase in ram displacement.As the extrusion speed increases,the temperature difference at the die exit of the profile along the extrusion direction increases.The exit temperature difference between the front and back ends of the extrudate along the extrusion direction obtained by adopting isothermal extrusion is about 6.9℃.Furthermore,the heat generated by plastic deformation and friction during extrusion is balanced with the heat transfer from the workpiece to the container,porthole die and external environment.展开更多
This paper describes the incremental PID control algorithm and the basic principles of motor soft start, and introduced STM32F103RB8 basic performance microcontroller, combined with incremental PID control advantages,...This paper describes the incremental PID control algorithm and the basic principles of motor soft start, and introduced STM32F103RB8 basic performance microcontroller, combined with incremental PID control advantages, and gives MCU in motor soft start process control application. Practice shows that the incremental PID applications, simplifying the control ideas to improve the performance of the current loop control, limiting the starting current, smooth start-up speed, and achieved good results motor start.展开更多
在烘烤盖+多功能顶枪的RH真空槽烘烤工艺中,多功能顶枪烘烤时存在诸多问题:燃气比例匹配失调、燃气流量控制系统PID参数整定困难、定枪位烘烤且枪位不合理和氮气保护气体使用不当。这时常导致安全事故、耐材烧损与开裂严重、燃气耗费量...在烘烤盖+多功能顶枪的RH真空槽烘烤工艺中,多功能顶枪烘烤时存在诸多问题:燃气比例匹配失调、燃气流量控制系统PID参数整定困难、定枪位烘烤且枪位不合理和氮气保护气体使用不当。这时常导致安全事故、耐材烧损与开裂严重、燃气耗费量较大、设备机械性能下降、维修率提高等不利现象发生。为此,中国重型机械研究院股份公司从燃气混合技术、PID流量调节技术、多串级闭环烘烤控制技术、变时长变流量多枪位循环加热技术和氮气保护技术等多方面进行研究,总结出新型RH真空槽高效顶枪烘烤技术。并应用于国内某钢厂的120 t RH真空槽烘烤工艺,生产顺利,作业率高,成本低,使用效果良好。展开更多
基金the financial supports from the National Natural Science Foundation of China(No.52005244)the Scientific Research Fund of Hunan Provincial Education Department,China(Nos.18B285,18B552)+1 种基金the Natural Science Foundation of Hunan Provincial,China(Nos.2019JJ50510,2019JJ70077)Young Scholars Program of Furong Scholar Program,China.
文摘The isothermal extrusion process of hollow aluminium profile was investigated using incremental proportional-integral-derivative(PID)control algorithm and finite element simulations.The range of extrusion speed was determined by considering the maximum extrusion load and production efficiency.By taking the optimal solution temperature of the secondary phase as the target temperature,the extrusion speed–stroke curve for realizing the isothermal extrusion of the aluminium profile was obtained.Results show that in the traditional constant extrusion speed process,the average temperature of the cross-section of the aluminium profile at the die exit rapidly increases and then slowly rises with the increase in ram displacement.As the extrusion speed increases,the temperature difference at the die exit of the profile along the extrusion direction increases.The exit temperature difference between the front and back ends of the extrudate along the extrusion direction obtained by adopting isothermal extrusion is about 6.9℃.Furthermore,the heat generated by plastic deformation and friction during extrusion is balanced with the heat transfer from the workpiece to the container,porthole die and external environment.
文摘This paper describes the incremental PID control algorithm and the basic principles of motor soft start, and introduced STM32F103RB8 basic performance microcontroller, combined with incremental PID control advantages, and gives MCU in motor soft start process control application. Practice shows that the incremental PID applications, simplifying the control ideas to improve the performance of the current loop control, limiting the starting current, smooth start-up speed, and achieved good results motor start.
文摘在烘烤盖+多功能顶枪的RH真空槽烘烤工艺中,多功能顶枪烘烤时存在诸多问题:燃气比例匹配失调、燃气流量控制系统PID参数整定困难、定枪位烘烤且枪位不合理和氮气保护气体使用不当。这时常导致安全事故、耐材烧损与开裂严重、燃气耗费量较大、设备机械性能下降、维修率提高等不利现象发生。为此,中国重型机械研究院股份公司从燃气混合技术、PID流量调节技术、多串级闭环烘烤控制技术、变时长变流量多枪位循环加热技术和氮气保护技术等多方面进行研究,总结出新型RH真空槽高效顶枪烘烤技术。并应用于国内某钢厂的120 t RH真空槽烘烤工艺,生产顺利,作业率高,成本低,使用效果良好。
