锻压技术

大型自由锻水压机操控系统双阀并联控制

英文标题：Two-valve parallel control of large free forging hydraulic press operation control system

作者：杨俊黄书舟陈中祥

单位：湖南师范大学

分类号：TP273

出版年,卷(期):页码：2018,43(10):141-145

摘要：

针对大型自由锻水压机快锻时操控系统所需流量巨大、位置精度高的问题，提出了采用普通换向阀和比例换向阀并联的双阀控制结构。当操控油缸活塞杆位移值离目标位移值较大时，采用低频响大流量的普通阀控制，以保证响应速度；当操控油缸活塞杆位移值接近目标位移值时，采用高频响小流量的比例阀控制，以保证位置追踪精度。建立了液压操控系统的仿真模型，分析了开关阀响应时间和比例阀死区对系统动态特性的影响，并对比分析了双阀并联控制和单个大流量比例阀控制的操控系统位置追踪特性。结果表明，双阀并联结构及相应策略具有更小的稳态误差和较长的响应时间，为自由锻水压机的高性能控制提供了一种有效的控制方法。

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.

基金项目：

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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