为提高硬质合金插齿刀的抗崩刃能力，需要采用负前角的特殊设计；
There is a special way of design of carbon alloy slotting tool which has minus rake angle to increase the ability of resisting the tooth edge collapse.
本文提出了对直槽零前角滚刀，原始截面刃形在基本蜗杆齿面上，其新滚刀刃形的计算方法。
This paper presents a calculating method for the edge of a new hob with straight groove and zero rake Angle. The original section edge of the said hob is on the surface of basic worm.
本文对刮削过程中工作角度问题进行了探讨，并对工作刃倾角、工作前角和工作后角进行了具体计算，得到了一些变化规律。
A study is made on the working Angle in scraping process, practical Calculations are taken up to the Angle of working edge, rake Angle and back Angle. Some patterns of such change are found out.
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