中文摘要：

将YA32—315型四柱式液压机由继电器控制改为可编程控制器（PLC）控制，对原有下顶出缸的液压油路控制系统进行改进，通过高精度比例溢流阀和PLC的模拟输入输出模块对顶出缸的油压进行控制，并结合板材变压边力成形工艺，在单动液压机上实现变压边力控制。在板材成形过程中通过可编程控制终端对成形力、压边力及凸模行程进行实时监视和控制。

英文摘要：

YA32-315 as fourcolumn type hydraulic press was changed from relay control to the programmable logic controller （PLC） control. Original control system of the hydraulic oil system of liftout cylinder was transformed. The oil pressure was controlled by the high accuracy proportional spillover valve and the analog I/O model of the PLC. With the deep drawing process of sheet metal the variable blank-holder force control was realized on the single-action hydraulic machine. The forming force, the black-holder force and the punch stroke were monitored and controlled in real time in the sheet metal forming process by the programmable Terminal （PT）.