Stepping motor PLC direct control

Stepping motor programmable controller direct control, can make the modular machine tool automatic production line control system cost significantly. This paper introduces the PLC control with stepping motor driven nc sliding table method, servo control, drive and interface and stepping motor PLC control software logic.
1 summarizes In modular machine tool automatic production line, the general according to rotating joint the different machining accuracy requirements set three sliding table
(1) hydraulic sliding table, used for cutting quantity is big, processing accuracy requirement lower rough machining process;
(2) mechanical sliding table, used for cutting output medium, has the certain machining precision requirements of the half finishing process;
(3) nc sliding table, used for cutting quantity is small, the machining accuracy high finishing process. Programmable controller (hereinafter referred to as PLC) with its strong universability, high reliability, instruction system simple, programming is easy to learn, easy to rotary union master, small in volume, less maintenance work, field interface convenient installation and a series of advantages, is widely used in industrial automatic control. Especially in modular machine tool automatic production line control and CNC machine tool S, T, M function control but also shows its excellent performance. PLC control stepping motor open loop servo mechanism applied in modular machine tool automatic production line nc sliding table control, can save this unit the numerical control system makes the unit control system cost reduction 70 ~ 90%, or even only take the transfer machine control unit PLC 3 ~ 5 I/O interface and < 1 KB of memory.
Especially in the large automatic line can make the control system cost significantly. 2 PLC control of CNC sliding table structure General modular machine tool automatic line of the CNC sliding table using stepper motor driven open loop servo mechanism. PLC control of CNC sliding table by programmable controller, circular pulse distributor, stepping motor drive, stepping motor and servo drive mechanism components, see figure 1. Figure 1 Servo drive mechanism of the gear Z1, Z2 should take backlash measures to fiber optic rotary joint fiber optic rotary joint avoid reverse dead zone or make machining accuracy down; And screw drive vice should be according to the unit processing accuracy requirement, and determine whether choose ball screw pair. The ball screw pair, with high transmission efficiency, system which has good stiffness and high driving accuracy, service life long advantages, high cost and cannot be self-locking. Three nc sliding table PLC control method