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为了解决当前数控加工中通用刀具加工弧齿锥齿轮存在的加工效率低、易切削颤振等问题,提出了中凹盘铣刀数控端铣弧齿锥齿轮的方法.基于对弧齿锥齿轮齿面几何结构的研究,通过选择大直径、刀底内凹的盘形铣刀,主动改变刀具姿态角的设置顺序,并分离了前倾角和侧倾角的功能,可以实现弧齿锥齿轮的齿底无干涉和大切削带宽加工.先以切触点位置确定侧倾角避免过切齿槽底面,再以平底刀加工自由曲面的思想分别确定两侧齿面的前倾角,保证大的切削带宽和高加工效率.结果表明:以一个弧齿锥齿轮大轮为例,中凹盘铣刀端铣轮两侧齿面分别以7次、6次切削完成加工,最大加工误差分别为0.039 4mm和0.041 8mm.采用该方法加工弧齿锥齿轮,具有刀具耐用度高,切削带宽大,走刀次数少和加工精度高等优点.
In order to solve the problems of low machining efficiency, easy chattering and other problems existing in common CNC machining of spiral bevel gears, a CNC milling end bevel spiral bevel gear method is proposed.Based on the analysis of spiral bevel gear teeth In the research of surface geometric structure, the gear tooth bottom of spiral bevel gear can be realized by choosing the disc cutter with large diameter and concave bottom, changing the setting order of tool attitude angle, and separating the rake angle and roll angle No interference and large cutting bandwidth processing.First, the position of the contact point to determine the roll angle to avoid overcutting the underside of the tooth surface, flat knives and then processing the free-form surface of the idea to determine both sides of the tooth flank anteversion, to ensure a large cutting bandwidth and high processing The results show that taking one large bevel gear as an example, the flanks on both sides of the end milling wheel of the concave disc cutter are finished with 7 times and 6 times respectively, the maximum machining errors are 0.039 4mm and 0.041 8mm respectively. The method of processing spiral bevel gear has the advantages of high tool durability, large cutting bandwidth, less number of passes and higher machining precision.