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刨床上加工刚性差的零件时,如果采用夹具夹紧,会使零件变形;所以经常要用千斤顶。而一般千斤顶都是用手来调节位置的高低和支承力的大小的,很不好控制;零件要求的加工精度高,那就更难了。附图是我们设计的自位支承千斤顶,使用起来很方便,能够得到高精度的加工面(对整形公差来说)。这种千斤顶在我们工厂已经用得很普遍;它还可以用在铣床、钻床上。使用的时候,先松开螺钉4,由于弹簧5的作用,使活动头1紧顶着工件;然后再拧紧螺钉,通过斜块7,就可以把活动头的位置固定下来。千斤顶
When machining parts with poor rigidity on the planing machine, if the clamp is used to clamp the parts, the parts will be deformed; therefore, jacks are often used. The general jack are used to adjust the position of the level of support and the size of the force, it is not good control; parts processing requirements of the high precision, it is more difficult. The figure is our self-supporting jack, easy to use, can get high-precision machining surface (for plastic tolerances). This jack has been used very commonly in our factory; it can also be used on milling machines and drilling machines. When used, firstly loosen the screw 4, and move the movable head 1 tightly against the workpiece due to the action of the spring 5; then tighten the screw and fix the movable head through the oblique block 7. jack