基于PLC的组合机床控制系统设计.doc

摘要 PAGE IV 基于PLC的组合机床控制系统设计 摘 要 组合机床是高度机电一体化的产品，是现代机床技术水平的重要标志，是现代机械制造业重要标志，是现代制造业的基础装备，尤其是在加工产品更换频繁、零件形状复杂、精度要求较高的工件时，不但可以节省大量的时间和资源，而且还能够确保工件的质量与产量，进而提高生产效率，具有良好的经济性。 传统的机床主要采用继电器--接触器进行控制，其缺点是故障率高、可靠性差、维修工作量大等，而采用PLC组成的控制系统可以很好地解决上述问题。本文在基于可编程控制器（PLC）的结构和工作原理的基础上，介绍了基于PLC的加工中心控制系统的总体方案设计，重点介绍了加工中心控制系统中的硬件选择方法、软件的设计过程，并给出了系统组成框图和程序流程图，提出了西门子PLC的编程方法，列出了具体的主要硬件电路、加工中心的控制梯形图及指令表，解决了继电器——接触器故障率高、可靠性差、安装调试周期长、维修工作量大、接线复杂等缺点。 关键词：组合机床，继电器—接触器，PLC，控制系统 Based on a combination of the plc tools to monitor system design ABSTRACT Building-block machine is a highly integrated mechanical and electrical products, is an important indicator of the level of modern technology ,is an important symbol of modern machinery manufacturing industry ,is the basis of modern manufacturing equipment, especially in the frequent replacement of processed products, spare parts of complex shape, the accuracy requirements are more stringent than work piece high, not only can save a lot of time and resources, but also to ensure the quality and output of the work piece, thus improving production efficiency, has a good economy. The main use of the traditional machine tool relay - contactor control, the drawback is the high failure rate, poor reliability, heavy workload of maintenance, consisting of the use of PLC control system can solve these problems. In this paper, based on the programmable logic controller (PLC) of the structure and working principle, based on the introduction of the PLC-based control system for machining centers overall program design, focuses on the machining center control system hardware selection, software design process and gives the system flow chart diagram and procedures, put forward a Siemens PLC programming methods, a list of specific hardware circuit, the control processing center table ladder and instructions to solve the relay - contacts high failure rate, reliability, poor long-term installation, maintenance workload and the complexity of wiring and other shortco