Design and Control of Four Corner Leveling System Based on Independent Metering for High-speed Hydraulic Presses

doi:10.3901/JME.2025.24.326

Abstract

Abstract: Hydroforming equipment is widely used in large tonnage, large size stamping, forging and other forming processes. Hence, high performance leveling system is needed to ensure the forming accuracy of the equipment. However, the traditional diagonal couple leveling system and its identity control strategy cannot accurately eliminate the inclination torque, which affects the forming quality of the workpiece. To solve the above problems, a four-corner leveling electro-hydraulic system based on independent metering for high-speed hydraulic presses is designed. In terms of leveling control, a diagonal cross and mean coupled synchronous control strategy based on pump-valve coordinate control is proposed. For the meter-out displacement controller design, the tracking error of each leveling cylinder is taken as negative feedback input, and the mean of tracking error and diagonal error are taken as compensation input into the sliding mode controller, so as to achieve accurate tracking and synchronous control of each cylinder. For the meter-in pressure controller design, the pressure servo valve is adjusted according to the working mode at the left and right maximum opening, so that the flow into the leveling cylinder is maximum and the pressure is minimum. For the pump flow controller design, the motor speed is determined according to the working mode of the leveling cylinder. Finally, an experimental platform for four-corner leveling of hydraulic press was built. The experimental results show that compared with the traditional identity control strategy, the proposed leveling control strategy improves the synchronization accuracy by 9.26%. At the same time, due to the energy-saving characteristics of the independent metering system, the power consumption of the system is reduced by 54% under the action of the control strategy. This study shows practical significance for the research and development of leveling system of high-speed forming equipment.

Key words: four-corner leveling system, independent metering valve control, diagonal crossed, synchronous control, energy saving

CLC Number:

TH137

HUANG Haihong, CHEN Huangxiang, LI Lei, LIU Qiong, XU Yuhang, YANG Chen, LI Guishan. Design and Control of Four Corner Leveling System Based on Independent Metering for High-speed Hydraulic Presses[J]. Journal of Mechanical Engineering, 2025, 61(24): 326-338.

References

[1] LI L,HUANG H,LI X,et al. An improved energy matching method to utilize the potential energy of large-sized hydraulic press at multi-system level[C]//24th Cirp Conference on Life Cycle Engineering,2017,61:547-552.
[2] 黄海鸿,唐运先,金瑞,等. 变速变排量液压驱动系统的动态过程能效优化[J]. 机械工程学报,2021,57(7):185-193. HUANG Haihong,TANG Yunxian,JIN Rui,et al. Energy efficiency optimized in the dynamic process of a variable-speed variable displacement pump unit[J]. Journal of Mechanical Engineering,2021,57(7):185-193.
[3] 解东旋,庄蔚敏,王楠,等. 高强度钢板热冲压工艺与装备研究综述[J]. 机械工程学报,2022,58(20):1-18. XIE Dongxuan,ZHUANG Weimin,WANG Nan,et al. Review on hot stamping process and equipment of high strength steel sheet[J]. Journal of Mechanical Engineering,2022,58(20):1-18.
[4] 金学军,龚煜,韩先洪,等. 先进热成形汽车钢制造与使用的研究现状与展望[J]. 金属学报,2020,56(4):411-428. JIN Xuejun,GONG Yu,HAN Xianhong,et al. A review of current state and prospect of the manufacturing and application of advanced hot stamping automobile steels[J]. Acta Metallurgica Sinica,2020,56(4):411-428.
[5] ZHANG X,CHEN Y,HU J. Recent advances in the development of aerospace materials[J]. Progress in Aerospace Sciences,2018,97:22-34.
[6] 章光灿. 玻璃钢制品压机四角调平控制系统的研究与设计[D]. 杭州:浙江大学,2014. ZHANG Guangcan. The research of four corners leveling control system for FRP product press[D]. Hangzhou:Zhejiang University,2014.
[7] ZHENG A,WU A,ZHANG Z. Master-slave leveling control based on the feedback linearization decoupling of 80mn titanium-alloy forging hydraulic press[C]//2011 International Conference on Electrical and Control Engineering,2011:3970-3973.
[8] 郑文达,权晓惠,李俊辉. 锻造液压机的现状及其展望[J]. 重型机械,2012(3):2-10. ZHENG Wenda,QUAN Xiaohui,LI Junhui. Development history and trend of forging hydraulic press[J]. Heavy Machinery,2012(3):2-10.
[9] 苑世剑,刘伟,徐永超. 板材液压成形技术与装备新进展[J]. 机械工程学报,2015,51(8):20-28. YUAN Shijian,LIU Wei,XU Yongchao. New development on technology and equipment of sheet hydroforming[J]. Journal of Mechanical Engineering,2015,51(8):20-28.
[10] 刘志峰,李磊,黄海鸿,等. 液压机驱动系统分区控制节能方法[J]. 中国机械工程,2016,27(14):1942-1948. LIU Zhifeng,LI Lei,HUANG Haihong,et al. An energy-saving partition control method drive system for hydraulic presses[J]. China Mechanical Engineering,2016,27(14):1942-1948.
[11] GAO M,LI X,HUANG H,et al. Energy-saving methods for hydraulic presses based on energy dissipation analysis[J]. Procedia CIRP,2016,48:331-335.
[12] 赵长财,杨盛福,刘培培,等. 大型模锻液压机平衡系统原理及其理论研究[J]. 机械工程学报,2012,48(10):82-89. ZHAO Changcai,YANG Shengfu,LIU Peipei,et al. Principle and theoretical analysis of the balancing system for large die forging hydraulic press[J]. Journal of Mechanical Engineering,2012,48(10):82-89.
[13] CHUNYAN D,GUANSHENG X,CHAO J. Fuzzy control of four-point leveling system of isothermal forging hydraulic press[C]//Proceedings of the 31st Chinese Control Conference,2012:7603-7608.
[14] 刘忠伟,邓英剑. 巨型模锻液压机同步控制系统建模及仿真[J]. 中国机械工程,2014,25(13):1800-1806. LIU Zhongwei,DENG Yingjian. Modeling and simulation for giant forging hydraulic press synchronous control system[J]. China Mechanical Engineering,2014,25(13):1800-1806.
[15] DU C,XING G,WANG J. Optimal control of force couple leveling system in heavy hydraulic forging presses[C]//201736th Chinese Control Conference (CCC),2017:4978-4982.
[16] 熊义. 基于任务坐标系的液压机四角调平控制[J]. 锻压技术,2021,46(7):166-171. XIONG Yi. Four-corner leveling control of hydraulic press based on task coordinate system[J]. Forming & Stamping Technology,2021,46(7):166-171.
[17] SUN C,YUAN R. Adaptive robust cross-coupling position synchronization control of a hydraulic press slider-leveling[J]. Science Progress,2021,104(1):1-19.
[18] ZHANG D,ZHANG S,WANG Z,et al. Dynamic control allocation algorithm for a class of distributed control systems[J]. International Journal of Control,Automation and Systems,2020,18(2):259-270.
[19] 王迪. 基于负载口独立控制的电液伺服阀控缸系统研究[D]. 北京:北京理工大学,2016. WANG Di. Research on electro-hydraulic servo valves controlled cylinder system basing on load port independent control[D]. Beijing:Beijing Institute of Technology,2016.
[20] DING R,ZHANG J,XU B,et al. Programmable hydraulic control technique in construction machinery:Status,challenges and countermeasures[J]. Automation in Construction,2018,95:172-192.
[21] 牛善帅,王军政,张鹏,等. 基于负载口独立控制的双伺服阀控缸系统[J]. 北京理工大学学报,2019,39(12):1292-1297. NIU Shanshuai,WANG Junzheng,ZHANG Peng,et al. Separate meter in and meter out valve controlled cylinder system based on dual servo control[J]. Transactions of Beijing Institute of Technology,2019,39(12):1292-1297.
[22] XU B,DING R,ZHANG J,et al. Pump/valves coordinate control of the independent metering system for mobile machinery[J]. Automation in Construction,2015,57:98-111.
[23] SHI J,QUAN L,ZHANG X,et al. Electro-hydraulic velocity and position control based on independent metering valve control in mobile construction equipment[J]. Automation in Construction,Amsterdam:Elsevier Science Bv,2018,94:73-84.
[24] LIU K,KANG S,QIANG H,et al. Cavitation prevention potential of hydromechanical pressure compensation independent metering system with external active load[J]. Processes,Multidisciplinary Digital Publishing Institute,2021,9(2):1-23.
[25] LIU K,KANG S,CAO Z,et al. Angle and force hybrid control method for electrohydraulic leveling system with independent metering[J]. Mathematical Problems in Engineering,2021,2021:1-13.
[26] 殷正瑞. 100 MN模锻液压机被动调平控制系统研究[D]. 常州:江苏理工学院,2020. YIN Zhengrui. Research on passive leveling control system of 100 MN die forging hydraulic press[D]. Changzhou:Jiangsu University of Technology,2020.