基于PLC的数控机床设计 毕业论文.doc

毕业设计（论文） 题 目 基于设计 系 （院） 自动化系 专 业 电气 班 级 20级班 学生姓名 学 号 指导教师 职 称 二〇一年六月二十日 关键词：可编程控制器 数字控制 顺序控制 操作指令 组合机床 自动循环 Abstract At present, the programmable controller (PLC) is widely used in CNC machine tools, and other industrial control. Nc machine tool control section can be divided into digital control and sequence control two parts, digital control part includes the position coordinates of the continuous control and sequence control including the spindle is/reversal and start/stop, change knife, chuck clamping and loosen, cooling, tail frame, clearance and auxiliary action control. Modern CNC machine PLC instead of relay control to complete logic control, make the CNC machine tool structure more compact, function more rich, response speed and reliability greatly improve! PLC (programmable logic controller) is a kind of specially designed for application in industrial environment and design of digital arithmetic operation of the electronic system, it USES a programmable program memory, in its internal storage to perform the logic calculation, sequential control, timing, counting and arithmetic operation instruction, through the digital and analog input and output to control various types of mechanical equipment and production process. Combination machine tools for a particular workpiece, specific processing and design of an efficient automation special processing equipment, this equipment can most knife work together at the same time, and has the function of automatic cycle. Combination machine tools usually consists of standard general parts and machining special parts that constitute, the power unit driven by motor or use hydraulic system driven by electrical system automatic cycle control, is a typical mechanical and electrical or mechanical and electrical integration of liquid automatic processing equipment. Keywords: programmable controller digital control sequence control operation instruction combination machine tools