我厂生产无缝钢管时所用的穿孔顶头,材料为3Cr2W8V,工件需钻φ1～1.5毫来的三个等分孔,使冷却循环水喷出,这样改进后的顶头使用寿命可提高20～30倍。但加工φ1～1.5毫米斜孔很困难,易折钻头的原因是台钻进给速度快,接近钻透时又有60°斜面。只好改装台钻进给装置。微动进给装置的结构简单,将箱体2套装在台钻进给齿轴轮1上,同时将蜗轮3紧固在轴1上,用内六方扳手通 I plant the production of seamless steel pipe when the piercing head, the material for the 3Cr2W8V, the workpiece needs to drill φ1 ~ 1.5 milliseconds to the three bisecting holes, the cooling water circulation, so that after the improvement of the head life can be increased 20 ~ 30 Times However, processing φ1 ~ 1.5 mm inclined hole is very difficult, easy to drill because the drill bit feed speed is fast, close to drilling when there is a 60 ° bevel. Had to modify bench drill feed device. The structure of the fretting feeding device is simple, and the box body 2 is sleeved on the table drilling feed gear shaft 1, meanwhile the worm wheel 3 is fastened on the shaft 1, the inner hexagon wrench