采用自动旋转刀头加工内外曲线油槽,可使表面光洁度由原来的▽3提高到▽▽4～▽▽5,且油槽的侧面毛刺减少。切削时,由于油稽是个螺旋曲线,刀刃左右两边在每一瞬间的负荷大小不等,对刀体轴线产生一个旋转力矩,使拉刀自动旋转,直到刀刃左右两侧受力相等,达到平衡为止,因此在切削时能使拉刀的实际切削角始终保持一致。加工图1、2所示的内外油槽时可采用图3的旋转 The use of automatic rotary cutter head processing internal and external curve tank, the surface finish from ▽ 3 increased to ▽ ▽ 4 ~ ▽ ▽ 5, and the side of the groove burr to reduce. Cutting, due to the funny is a spiral curve, the left and right sides of the knife at each moment of the load range, the axis of the knife body to produce a rotating torque, so that the broach automatically rotate until the edge force equal to the left and right sides, to balance , So when cutting the broach can make the actual cutting angle always consistent. The internal and external tanks shown in Figures 1 and 2 can be rotated as shown in Figure 3