6ES5 948-3UA13

6ES5 948-3UA13

 组合机床的控制

两工位钻孔、攻丝组合机床，能自动完成工件的钻孔和攻丝加工，自动化程度高，生产效率高。两工位钻孔、攻丝组合机床如图7-32所

机床主要由床身、移动工作台、夹具、钻孔滑台、钻孔动力头、攻丝滑台、攻丝动力头、滑台移动控制凸轮和液压系统等组成。

移动工作台和夹具用以完成工件的移动和夹紧，实现自动加工。钻孔滑台和钻孔动力头，用以实现钻孔加工量的调整和钻孔加工。攻丝滑台和攻丝动力头，用以实现攻丝加工量的调整和攻丝加工。工作台的移动（左移、右移），夹具的夹紧、放松，钻孔滑台和攻丝滑台的移动（前移、后移），均由液压系统控制。其中两个滑台移动的液压系统由滑台移动控制凸轮来控制，工作台的移动和夹具的夹紧与放松由电磁阀控制。

根据设计要求，工作台的移动和滑台的移动应严格按规定的时序同步进行，两种运动密切配合，以提高生产效率。

1. 控制要求

系统通电，自动起动液压泵电动机M1。若机床各部分在原位（工作台在钻孔工位SQ1动作，钻孔滑台在原位SQ2动作，攻丝滑台在原位SQ3动作），并且液压系统压力正常，压力继电器PV动作，原位指示灯HL1亮。

将工件放在工作台上，按下起动按钮SB，夹紧电磁阀YV1得电，液压系统控制夹具将工件夹紧，与此同时控制凸轮电动机M2得电运转。当夹紧限位SQ4动作后，表明工件已被夹紧。

起动钻孔动力头电动机M3，且由于凸轮电动机M2运转，控制凸轮控制相应的液压阀使钻孔滑台前移，进行钻孔加工。当钻孔滑台到达终点时，钻孔滑台自动后退，到原位时停，M3同时停止。

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