Speed changing method of stepping motor for program control punching machine

The invention discloses a speed change method of a stepping motor for a program control punching machine, which comprises the following steps of: after initializing the program control punching machine, sequentially switching on a direct current motor, an oil pump motor and a main motor; and the position of the workbench is obtained and located at the original point, machining positioning point data is obtained, a machined object on the workbench is adjusted to be accurately positioned, a die currently needed to be machined on the punch is adjusted, and the punch is driven to conduct machining. The variable delay program is used for controlling the speed change of the motor, step dropping is avoided, and the speed change is accurate. 本发明公开了一种程控冲床用步进电机的变速方法，包括以下步骤：对程控冲床初始化后，依次接通直流电机、油泵电机以及主电机；获取工作台位置并使其处于原点，获取加工定位点数据调整工作台上的加工物件准确定位，调整冲头上当前所需加工用模具，驱动冲头进行加工。本发明利用可变延时程序控制电机的变速且不会发生掉步，精准变速。