Usually the length of the shaft with which diameter ratio greater than 20 ~ 25 (L / d ≥ 20 ~ 25)axis is called the slender shaft. And the processing?,35 × 4095? 10 × 1300 long axis of the path length ratio of about 1:100 to 1:150, is the ultra-fine long axis machining. Superfine long axis of the turning process characteristics: Ultra-fine long axis of rigid poor, turning fashion folder improper, it is easy because of the role of cutting force and the gravity of the occurrence of bending, vibration, thus affecting the machining accuracy and surface roughness. The
Superfine long axis of the thermal diffusivity of poor performance, the effect of cutting heat will produce a large linear expansion. If the two ends of the shaft to a fixed support, the work piece due to the elongation of the top bends. Since the shaft is longer, a tool path for a long time, tool wear, thus affecting the geometry of the precision of the parts. car superfine long axis supporting the work piece with the tool holder, the two supporting block inappropriate parts pressure will affect the machining accuracy. If the pressure is too small or do not touch, it doesn’t work, can not increase the stiffness of the part: If the pressure is too large, the part is pushed to the lathe tool, the cutting depth increases, the car out of the diameter is small, continue to move with the turret bearing block support in the small-diameter cylindrical bearing block and the work piece from the cutting force to the work piece out get out, the cutting depth is reduced, the car of the diameter of the larger, later any connection with the turret to the large-diameter circle, but also pressure to the work piece to a turning tool, make the car a smaller diameter, so that continuous change regularly, slender work piece car into "bamboo" shape. Caused by the rigid side of the machine tool, work piece, tool, process systems for cutting difficult, not easy to get a good surface roughness and geometrical accuracy. In practice, through trial and error, using a variety of turning device: If three bearing block with the turret, flexible active thimble, pads, brackets support using reverse feed turning: turning, with the best tool geometry parameters, cutting parameters, a series of effective measures. Improve the long axis of rigid ultra-fine, to meet the processing requirements. Processing of ultra-fine long axis so that the good effect, surface roughness Ra3.2 above, taper error of only 0.04mm the work piece total length of 4m, the elasticity is 0.01mm, the curvature is only 0.15mm. And work efficiency is greatly improved.
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