最近,我们在加工图1零件的长圆锥形弧面时,自制了一套简易夹具,在铣床上加工,效果良好。铣削时,铣床分度头三爪卡盘夹住夹块5右端的圆柱部分(见图2),尾座顶尖顶住顶块2。调整分度头和尾座,使分度头主轴中心和尾座顶尖中心连线与铣床工作台平面成α角,tgα=(20—8)/372。这时,工件长圆锥形弧面中心线o-o。与分度头主轴中心和尾座顶尖中心的连线重合,且o-o中心线与铣床工作台平面成α夹角,而长圆锥形弧面母线A与工作台面B平行。铣削分粗、精铣,粗铣时留0.4～0.6mm精铣余量。精铣时,使端面磨成R4的键槽立铣刀的尖端与工件A面重合。当工作台纵向移动372mm后,就在长圆锥形弧面上铣 Recently, when machining the long conical arc of the part in Figure 1, we made a set of simple fixtures that worked well on a milling machine. Milling, three-jaw milling machine indexing chuck clamping chuck 5 right column (see Figure 2), the top of the tailstock to withstand the top block 2. Adjust the indexing head and the tailstock so that the centerline of the indexing head spindle center and tailstock center center make an angle α with the plane of the milling machine table, tgα = (20-8) / 372. At this time, the workpiece long conical arc centerline o-o. Coincides with the line connecting the spindle center of the indexing head and the center of the tailstock, and the o-o centerline forms an angle α with the plane of the milling machine workbench, while the long conical arc-shaped busbar A is parallel to the workbench B. Milling coarse, fine milling, coarse milling leaving 0.4 ~ 0.6mm finishing allowance. During finish milling, the tip of the slotted end mill ground to R4 coincides with the workpiece A side. When the table moves 372mm longitudinally, it is milled on a long conical arc