管件液压胀形机电液系统建模仿真与试验分析

Modeling,Simulation and Analysis of the Tube High-pressure Hydroforming System

内高压成形液压机侧缸通常采用阀控非对称缸设计,结构上的非对称性造成了两个方向上动态特性不对称,给侧缸同步控制造成了困难。通过给出了内高压成形液压机侧缸位置同步控制系统的数学模型,并对模型采用SIMULINK软件进行计算机仿真,对上述问题提出了同等方式、主从方式、同等+主从方式三种策略,并进行了比较与分析。最后给出了试验结果,并对从响应的快速性和精度方面对试验结果进行了分析。结果表明,采取的控制策略合理可行且设计简单,位移和压力系统均能正常工作,对于其它内高压成型机非对称缸同步控制具有重要参考价值。

Valve-controlling asymmetric cylinder plan is frequently adopted for high-pressure forming equipment.But the structural asymmetry leads to dynamic performance asymmetry on the two moving directions,which makes it difficult to control the synchronous movement of two side cylinders.A mathematical model of synchronous system of high-accuracy position is given in the article.Computer simulation is done based on SIMULINK.To solve the above-mentioned problem,three control strategies which are used in synchronous system are compared and analyzed.They are synchronous mode,master-slave mode and synchronous plus master-slave mode.Finally,some test results and their analyses are given.Analysis is conducted from the perspectives of response velocity and precision.The results indicate that the control strategy is reasonable,feasible and simple.The position and pressure systems both worked well.The methods are referable for the design of other asymmetric cylinder control in hydroforming equipment.