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机加工自动线是工业生产中常用的设备之一,它主要由8个工作工位和上下料工位组成,能完成铣端面、镗孔、钻孔、扩孔、攻丝、钻深孔、检查与转位等功能。其工作状态一般有5种:全线全自动、全线半自动、全线回原位、单机自动和单机点动。采用分散控制方式,其信号传递如图1所示。根据控制系统的要求和I/O点的数量,本自动线采用日本三菱公司FX_2—128MR可编程控制器进行控制,同时外加扩展单元FX—48ER。本文以钻孔工位为例,简述系统的控制过程和PLC的编程方法。 电气控制要求 根据生产工艺要求和图1所示的信号传递过程,对于钻孔工位,我们设置了“预开”、“起动”、“复位”和“急停”4种操作方工式。当输送和钻孔动力头处于原位(X47、X50、X71为1),定位
Machining automatic line is commonly used in industrial production equipment, which is mainly composed of 8 work stations and loading and unloading stations, to complete the milling face, boring, drilling, reaming, tapping, drilling deep hole, check And indexing and other functions. The working conditions are generally five kinds: full automatic, full-line semi-automatic, full back to the original position, stand-alone automatic and stand-alone jogging. Using decentralized control, the signal transmission shown in Figure 1. According to the requirements of the control system and the number of I / O points, this automatic line is controlled by Japan’s Mitsubishi FX_2-128MR PLC, plus an expansion unit FX-48ER. In this paper, drilling station as an example, a brief description of the system control process and PLC programming. Electrical Control Requirements According to the requirements of the production process and the signal transmission process shown in Figure 1, for the drilling station, we set four operating modes: “pre-open”, “start”, “reset” and “emergency stop”. When conveying and drilling power head is in position (X47, X50, X71 is 1), positioning