1762-IF20F2

1.1车床液压控制回路的液压元件构成

　　此车床液压控制回路主要由以下原件组成：左夹紧液压缸用于夹紧工件和卸下工件，中横向进给液压缸带动刀具横向进给，右纵向进给液压缸带动刀具纵向进给，6个电磁换向阀控制进给液压缸的前进与后退，2个调速阀控制进给液压缸进给速度，双联泵提供液压油输出，另外采用3个单向阀控制液压油流动方向，减压阀和压力继电器监控夹紧缸的油压。

　　
1.2 车床液压控制回路的工作原理

　　液压控制回路如图1所示，其作用主要是能够控制车床完成完整的切削加工过程，并且工作一个循环，分为8个步聚：1、装件夹紧；2、横快进；3、横工进；4、纵工进；5、横快退；6、纵快退；7、卸下工件；8、原位停止；各步骤的切换分别由行程开关SQ1、SQ2、SQ3、SQ4、SQ5、SQ6、SQ7控制，具体工作循环如图2所示。行程开关用于控制液压回路中6个电磁换向阀电磁铁的通电与否，进而改变液压油流向，影响液压缸实现动作顺

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