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三、不能仅由理论上证明滚刀可以不“对中”提出滚刀可以不“对中”的主要依据是:(1)根据范切原理不论滚刀对中与否,刀具的瞬时切点位置总是不会偏离啮合线的,因而得出只要滚刀两侧刀刃的齿形角相等,不论滚刀对中与否,齿形两侧折线所包络的渐开线都是相同与对称的,绝不会出现齿形畸变现象。(2) 通过计算齿面棱度(包络误差,多角误差)、切线根数,不对中的两侧曲线长度差等值与理论值相差甚微,因而得出不对中时误差没有异常变大现象,而且最大误差可认为没有差别,所以“对中”没有必要。
Third, not only theoretically proved that the hob can not “center” the hob can not “center” on the main basis is: (1) according to the principle of fan cutting regardless of the hobbing right or not, the tool instantaneous tangent point Position is always not deviate from the meshing line, and thus concluded that as long as both sides of the cutting hob tooth angle equal, regardless of the hob right or wrong, both sides of the profiled involute lines are the same envelope and symmetry , There will be no phenomenon of tooth distortion. (2) By calculating the tooth edge (envelope error, multi-angle error), the number of tangent lines, misalignment between the two sides of the curve length difference and the theoretical value difference is very small, so that when the error does not abnormal increase Phenomenon, and the maximum error can be considered no difference, so “right” is not necessary.