图1所示的空心轴是桕式洗矿机上关键零件,由于目前这种尺寸的国产无缝钢管最长只有7m。为达到图纸所要求的长度,需用两段管子焊接而成。该零件在工作中承受很大的扭矩,为保证足够的强度,两根管子的对接面不能用圆截面,而是与轴线成60°的椭圆面,焊缝为V形70°坡口,如何在椭圆面上加工出坡口(即倒角),是值得探讨的问题。 (?)一平面斜截正圆锥,且与圆锥面上所有的素线 Hollow shaft shown in Figure 1 is a key part of the 洗-type ore washing machine, as the current domestic size of the largest seamless steel pipe only 7m. To achieve the required length of the drawings, the need to use two sections of pipe welded together. In order to ensure sufficient strength, the parts can not be circular cross section, but with an oval surface 60 ° to the axis, the weld is V-shaped 70 ° bevel, How to make a groove on the oval surface (ie, chamfering) is worth discussing. (?) A flat oblique cone, and with the conic surface all the prime lines