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在机床上打深孔时,由于排屑、散热困难,容易将钻头扭断。后来采用了扭力传感器,用以保护钻头,即当钻头扭力接近某允许值时,传感器发出讯号,令钻头退出被加工孔,待排屑、冷却后,再进刀钻削。周而复始,直到加工完毕。但这样做会降低生产效率。为提高生产率,又设计了液压记忆油缸。为说清问题,先介绍一下没有安装记忆油缸时的机床钻削情况(见图1、图2)。按下机床工作启动按扭(电气控制图从略),电磁阀1DT得电,主油缸活塞推动机床拖板向左快速移动(空行程部分),安装在拖板上的打块压着XK_2,2DT得电,拖板转入工进(即加工)速度。此时钻头刃口尖端由Q点移到G点,准备钻削。设当钻头刃口尖端
Playing deep holes in the machine, due to chip removal, cooling difficulties, easy to twist the drill. Torque sensor was later used to protect the drill, that is, when the drill bit torque approaching a certain allowable value, the sensor signals that the drill bit out of the hole to be chip, after cooling, and then feed into the drilling. Cycle again and again until finished. But doing so will reduce productivity. To improve productivity, but also designed a hydraulic memory cylinder. In order to clarify the problem, first introduce the drilling machine is not installed when the cylinder memory (see Figure 1, Figure 2). Press the machine start button (electrical control diagram omitted), the solenoid valve 1DT get power, the main cylinder piston to push the machine to move quickly to the left (empty travel part), installed in the drag on the block pressing XK_2, 2DT was power, drag into the board (that is, processing) speed. At this point the tip of the drill edge moved from Q point G, ready for drilling. Set as a drill edge tip