锋利的切削刃和正前角是要避免。
Sharp cutting edges and positive rake angles are to be avoided.
文中的数学模型亦可用于零前角及正前角齿轮滚刀重磨后的齿形误差计算及修正。
The mathematical model presented in this paper can also be used in the regrinding of gear hobs with zero rake Angle and positive rake Angle for error calculation and revision.
改变正前角成形铣刀只能用作粗加工的观念，可将正前角成形铣刀用于成形面的精加工。
The conception that the form-milling cutter can only be used to rough finish the workpiece should be changed. This kind of form-milling cutter can also be used to finishing-machine workpiece.
通过分析掉渣、崩刃、噪声的机理，采取改进刀具参数、采用正前角双刃刀片等措施，较好解决了上述问题。
By analyzing the mechanism of falling chip, tipping and noise, through changing the cutter's parameters and using double edge positive edge inserts, the problems can be solved.
结果表明：在直槽或螺旋槽、零前角或正前角等情况下，用本文设计的磨轮铲磨的滚刀，其基本蜗杆轴截形在从新到旧的整个使用过程中都是精确的。
The following conclusion is obtained. In the cases of straight gash, spiral gash, zero rake angle and positive rake angle, the hob worm profile from hob put into use to hob abandoned i…
结果表明：在直槽或螺旋槽、零前角或正前角等情况下，用本文设计的磨轮铲磨的滚刀，其基本蜗杆轴截形在从新到旧的整个使用过程中都是精确的。
The following conclusion is obtained. In the cases of straight gash, spiral gash, zero rake angle and positive rake angle, the hob worm profile from hob put into use to hob abandoned i…
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