Socket machining countersinking bit

The invention is a scribing-socket compound counter drill, including drilling bit and drilling rod, where the central drill is inserted in inner cavity of drilling rod and counter drill, the drilling bit of the central drill sticks out of that of the counter drill, the drilling rod is set with a casing body outside, and the inner surface of guide screw thread case tallies with the outer surface of the casing body and is installed on the casing body; there are roll slideway and thrust bearing set between the spacing slide-rolling case and the screw thread case, there are steel balls and regulator pad held in the slideway and the rest space is full of glycerol. Locking nut is linked with the screw thread case, which is installed on the casing body and the spacing slide-rolling case and there is a regulator nut installed between the locking nut and the spacing slide-rolling case. There is a sealing cover installed on the slide-rolling case, and the regulator pad is installed between the sealing cover and the thrust bearing. It transfers torque through shaft hole, key groove positioning, regulator bolt fixation and the rotation of the drilling rod placed in the shaft hole, the counter drill works stably and can primarily complete manufacturing the sealing socket size of valve body, heightening the processing precision and smoothness. 一种划窝复合埋头钻，包括钻头、钻杆，其中心钻插装在钻杆和埋头钻内腔中，中心钻的钻头探出埋头钻的钻头，钻杆外面装有套体，导向螺纹套内表面与套体外表面吻合装在套体上，限位滑滚套装在螺纹套外面；限位滑滚套与螺纹套之间设有滚动滑道和推力轴承，滑道内装有钢球和调整垫，余下空间充填满甘油。锁紧螺帽与螺纹套之间相连接，装在套体和限位滑滚套上面，锁紧螺帽与限位滑滚套之间装有调节螺母。限位滑滚套上面装有密封盖，密封盖与推力轴承之间装有调整垫。本埋头钻以轴孔、键槽定位，调节螺钉固定，钻杆装于钻床主轴孔内作旋转运动进行扭矩传递，埋头钻工作平稳，可一次完成阀体密封窝尺寸加工，提高了密封窝加工精度和光洁度。