直齿锥齿轮的成批加工,目前仍以创齿加工为主,为了减少创齿加工的负荷和提高刨刀的使用寿命,要在刨齿前进行粗铣。而粗切铣刀的齿形设计一般用作图法,因直齿锥齿轮大端的模数和周节要比小端大,其齿形渐开线曲率在沿齿长方向的各个截面上也不同,因此,粗切铣刀用作图法进行齿形设计时是参照被加工直齿锥齿轮大小端困形,取与大小端齿形均接近的齿形作为粗切铣刀的齿形,以保证被加工直齿锥齿轮在粗切后其大小端分圆上单边刨削余量为0.3～0.5毫米,且在大小端齿顶、齿根部的精刨余量也合适。因此,用这种方法设计粗切铣刀齿形往往要反复多次作图比较,且由于作图误差的影响,设计出的粗切铣刀在实际生产加工中有出现大小端齿顶、齿根所留精刨余量不匀、甚至出现一端无余量的现象。为此,提出了一种粗切铣刀齿形新的设计方法,其原理如图所示。设刀齿坐标为xoy,用圆弧代替大小端的渐开线齿形。即选择大小端齿形曲线与各自的 Straight bevel gear batch processing, is still mainly to create tooth processing, tooth processing in order to reduce the load and improve the life of the planing knife, to be roughed in front of the tooth. Rough cutting cutter tooth design is generally used as the map method, because the straight end bevel gear large modulus and the end of the week than the small end, the involute involute along the length of the tooth along the cross-section Therefore, the rough cutter used as a graph method for profile design refers to the shape of the straight bevel gear to be processed, In order to ensure that the straight bevel gear to be machined after rough cutting the size of its round end of the unilateral shaving allowance of 0.3 to 0.5 mm, and in the size of the tip, the tooth root part of the fine shaper margin is appropriate. Therefore, using this method to design coarse cutter cutter tooth shape often repeated multiple drawing comparison, and due to the impact of mapping errors, the rough cutter designed in the actual production of large and small tip, tooth Unbalanced fineness balance left by the root, and even there is no margin at one end of the phenomenon. For this reason, a new design method of roughing cutter tooth shape is proposed, the principle of which is as shown in the figure. Set the cutter coordinates xoy, with the arc instead of the size of the involute involute. That is, choose the size of the end of the tooth curve with their own