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如图1所示多台阶细长轴,切削余量大都集中在A、B两处。切削过程中,A处台阶按图纸尺寸进行切削,工件直径逐渐变小。当加工至B处台阶时,随着被切削轴直径的缩小,工件刚性越来越差,自重下垂产生的挠度及变形越来越突出,既限制切削用量的提高,又直接影响了工件的几何精度和表面光洁度。在使用跟刀架车削B处台阶时,跟刀架易碰到主轴卡盘。针对上述问题,我们在C630普通车床上对装夹、加工方法进行了改进,其方法如图2所示。利用C630车床尾部的M94×1.5螺纹,配制一只特殊法兰2,法兰2内配一只螺纹键3,将配制好的辅助三爪定心卡盘拧紧在主轴尾端螺纹上,然后拧紧保险螺钉4,使法兰内的螺纹键锁紧在主轴尾端,从而确保辅助三
As shown in Figure 1, multi-step slender shaft, cutting allowance are mostly concentrated in A, B two. Cutting process, A step by drawing the size of the cutting, the workpiece diameter becomes smaller. When processing to B steps, as the diameter of the shaft is reduced, the workpiece is getting worse and worse, deflection and deformation caused by self-weight more and more prominent, not only to limit the increase of cutting, but also directly affect the geometry of the workpiece Accuracy and surface finish. In the use of the knife with the turret turning B step, with the turret easily hit the spindle chuck. In response to the above problems, we C670 lathe on the fixture, processing methods were improved, the method shown in Figure 2. Make a special flange 2 with a M94 × 1.5 thread on the tail of the C630 lathe, and a threaded key 3 in the flange 2. Tighten the prepared auxiliary three-jaw centering chuck to the tail thread of the spindle Insurance screw 4, so that the threaded flange key lock in the spindle end, so as to ensure that three