The numerical control system of the crimping machine is mainly composed of a numerical control device, a stepping motor and its driving power source, a feed drive mechanism and a position detecting device.
(1) One CNC device PC586, one HK6120-PC bus I/O board, one K-34 12-bit data acquisition template, and the A/D converter adopts AD574 conversion chip.
(2) Stepping motor and its driving power supply 160BF5C-15/075 stepping motor and HH588V10 stepping motor driving power supply.
(3) The feed drive mechanism consists of a sleeve, a ball screw, a nut, and a mechanical slide. The stepper motor shaft and the ball screw are rigidly connected by a sleeve to transmit the stepper motor output torque.
(4) The position detecting device is a position signal detecting circuit composed of a GK122 type photoelectric circuit breaker.
During the machining process, the workpiece rotates at a constant speed; the photoelectric circuit breaker mounted on the output shaft of the reduction gearbox detects each workpiece position signal and feeds it back into the microcomputer to determine the initial feed position of the workpiece; and then passes the interface circuit to the stepping motor. The driver sends a control data signal calculated in advance according to the external dimensions of the workpiece, drives the stepping motor to rotate, and drives the rotary wheel to linearly feed through the ball screw and the nut pair, so that the feeding motion of the rotating wheel cooperates with the rotating motion of the workpiece, and the two processes are combined. Out of the workpiece.
The mathematical model of the numerical control system: the system takes the digital pulse command of PC586 microcomputer as input, and takes the ram displacement as the output. By obtaining Ka, G1(s), G2(s), G3(s), the transfer function of the control system is obtained. G(s) is G(s)=Xout(s)Xin(s)=KaG1(s)G2(s)G3(s)=KGs(s2+m1s+n1)(s2+m2s+n2), where : KG, m1, n1, m2, and n2 are constants determined by system structure and characteristic parameters. The above formula shows that the servo system has an obvious integral link, which is a fifth-order system; it has a small time lag, is easy to stabilize, and is suitable for controlling machine tools.
(Finish)
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