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1、摘要摘要点焊机作为一种重要的工业用具，在当今的工业生产中占着很重要的位置。点焊是一种重要的焊接工艺，具有成本低、生产效率高、易于实现自动化和节省材料等特点。如今，传统的点焊机自动化程度低，生产效率不高，焊点质量差，这已经不能满足工业发展的需求。因此，需要开发一种自动化程度高的点焊机控制系统。本文的 点焊机控制系统系采用 PLC 加触摸屏的控制方式，能很大程度的提高企业的生产效率，减少废品率。本文所涉及的点焊机系 采用双面双点过流焊接的原理，工作时 工件被压在两个电极之间,在压力的作用下两电极之间产生电阻。当有电流通过时，就会产生高温电弧，高温融化被焊接的工件，并 且电流瞬间从另一电极沿工件流至
2、此电极 ，并形成回路，不对被焊工件的内部结构产生伤害。和传统半自动化点焊机相比较，该设备焊出的焊点及焊缝长度分布更均匀、效率更高，节省人力。 本次设计的点焊机由可转动的圆形工作台、带动电机左右移动的横梁以及控制电机上下运动的主轴构成。主要加工某公司旋转座椅的零部件，一共有三个工位需要加工，这三个工位的运动控制都是由伺服系统完成精确的定位控制。 3 套伺服系统分别控制 X、Y、Z 轴完成精确定位，PLC 则对伺服电机驱动器进行控制，伺服驱动器则负责驱动伺服电机。关关键键词词：信捷 PLC；伺服电机 ；触摸屏IAbstractSpot welding as an important industr
3、ial appliances, occupied a very important position in todays industrial production. Spot-welding process is an important, low cost, high efficiency, easy to automate and saving materials and so on. Today, the traditional spot welding low degree of automation, production efficiency is not high, poor
4、weld quality, which can not meet the needs of industrial development. Therefore, the need to develop a high degree of automation control system of spot welding. Spot welding control system system control PLC paper, plus a touch screen, to a large extent improve production efficiency, reduce scrap ra
5、tes. Spot welding system referred to herein using double-sided double-point overcurrent welding principle, the work piece is pressed between two electrodes under pressure produces resistance between the two electrodes. When a current is passed, it will have a high temperature arc, high melting tempe
6、rature of the workpiece to be welded, and the current moment from the other electrode along the workpiece flow to this electrode, and form a loop, does not harm the internal structure is the welder member. And the traditional semi-automatic welding machine compared to the device solder joints and we
7、ld length out more evenly distributed, high efficiency and save manpower.The design of the spot welding by a rotatable circular table, motor driven beam move around and up and down movement of the spindle motor control composition. The main processing components rotating seat of a company, a total o
8、f three stations need to be processed, these three stations precise motion control is done by the servo positioning control system. 3 sets of servo control the X, Y, Z axis for accurate positioning, PLC is to control the servo motor drives, servo drives are responsible for driving the servo motor.Ke
9、ywords: XinJie PLC; servo motor; touch screen目目录录摘要 .IAbstract .II 第 1 章 绪 论 .1 1.1 课题意义 .1 1.2 课题的国内外现状及趋势 .1 1.2.1 国内电焊机科技水平及发展趋势 .1 1.2.2 国外电焊机科技水平的现状和发展 .1 1.3课题内容 .2 第 2 章 点焊机工艺的介绍 .3 2.1 点焊机控制系统 .3 2.1.1 系统原理 .3 2.1.2 系统控制框图 .3 2.2 点焊机控制系统的结构介绍 .4 2.3 点焊的基本原理 .4 2.4 点焊机控制系统的工艺流程 .5 2.5 本章小结 .6 第 3 章 控制方案比较 .7 3.1 方案比较 .7 3.1.1 确定控制方案 .7 3.1.2 确定控制方向 .8 3.2 本章小结 .8 第 4 章 硬件设计 .9 4.1 控制要求 .9 4.2 控制方案 .9 4.3 硬件控制系统 .9 4.4 硬件选型 .10 4.4.1 PLC 选型 .10 4.4.2 伺服电机的选型 .11 4.4.3 伺服驱动器的选型.12 4.4.4 触摸屏的选型 .14 4.4.5 熔断器的选型 .15 4.4.6 按钮开关的选型 .15 4.4.7 行程开关的选型 .
