Transactions of Materials and Heat Treatment

Title：Two-valve parallel control of large free forging hydraulic press operation control system

Authors： Yang Jun Huang Shuzhou Chen Zhongxiang

Unit： Hunan Normal University

KeyWords： free forging hydraulic press two-valve parallel operation control system dead zone position tracking

ClassificationCode：TP273

year,vol(issue):pagenumber：2018,43(10):141-145

Abstract：

For the problem of large flow and high precision position in operation control system of large free forging hydraulic press during fast forging, a two-valve control structure with paralleling a general directional valve and a proportional directional valve was proposed. When the displacement of piston rod of hydraulic cylinder was far from its target, the low frequency and large flow general directional valve was used to ensure the response speed, however, when it is near to its target, the high frequency and low flow proportional directional valve was used to guarantee the position tracking accuracy. Then, a simulation model of hydraulic operation control system was established, and the influences of different response times of switch valve and the dead zone of proportional valve on the system dynamic characteristics were analyzed. Furthermore, the position tracking performance of the operation control system between the twovalve parallel control and the single large flow proportional valve control was compared and analyzed. The results show that the twovalve parallel structure and corresponding strategy have a smaller steady state error and a longer response time to provide an effective control method for the high performance control of free forging hydraulic press.

Funds：

湖南省自然科学基金资助项目（2016JJ3088）；高性能复杂制造国家重点实验室项目（zzyjkt2016-07）

杨俊（1985-），男，博士，讲师，E-mail：yangcsu@126.com

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