开式泵控锻造油压机流量压力复合位置控制研究

Research on Flow Pressure Compound Position Control of Open Circuit Hydraulic Pump-controlled Forging Press System

针对开式泵控锻造油压机在压下过程中管路结构所带来的快锻滞后等问题,建立了机组主泵、主缸以及管路结构数学模型,推导了机组压下特性传递函数。以数学模型为基础,提出了基于流量压力复合控制的前馈补偿控制方法,实现了机组压下阶段空载位置控制以及带载压力补偿位置控制,即机组压下特性的综合控制。以0.6MN锻造油压机实验平台为基础展开仿真与实验研究,结果表明:所提出的控制方法对解决开式泵控锻造油压机液压系统快锻带载时压力上升慢、压下量不足等问题具有良好效果。

Aiming at the problems such as fast forging lag by the pipe lines of open circuit hydrau- lic pump-controlled forging press system, the mathematical models of main pump, master cylinder and pipe line were developed for the response lag under the forging processes, and the corresponding transfer functions were derived. On the basis of mathematical models, the feed-forward compensation control was proposed based on flow and pressure compound control. The system could achieve position control at no load and pressure compensation position control at on load, therefore the system con- trolled the pressure characteristics comprehensively. Based on 0.6 MN hydraulic forging press experi- mental platform, the simulation and experiments show that the method brings a good effect on the problems such as slow rise of pressure and insufficient degree of forging of the open circuit hydraulic pump-controlled forging press system at on load.