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在切齿工艺中,齿形误差△f_f、基节偏差△f_(pb)和周节偏差△f_(pt)是由机床分齿运动误差、分度蜗杆制造和安装误差、分度蜗轮或分度盘的局部齿距误差和分齿挂轮的安装偏心及刀具误差引起的。这些误差共同影响着齿轮传动的平稳性,而在几何关系和实测统计上却又互为相关。△f_f 反映的是一齿范围内的误差,△f_(pb)和△f_(pt)反映了换齿误差。因此,仅检验其中一项误差不足以评定齿轮传动平稳性精度。标准规定取其中任意两项组合起来检验,以便于较全面地控制影响该项精度的切齿工艺误差因素。
In the gear cutting process, the tooth profile error Δf_f, the pitch deviation △ f_ (pb) and the pitch deviation △ f_ (pt) are caused by the machine tool tooth separation error, indexing worm manufacturing and installation error, indexing worm gear or indexing The local pitch error of the disc and the installation eccentricity of the gear and the tool error caused by the gear. These errors together affect the smoothness of the gear transmission, but in the geometric relationship between the actual statistics but are mutually related. △ f_f reflects the error within one tooth range. △ f_ (pb) and △ f_ (pt) reflect the gear changing error. Therefore, only one of the errors is not enough to assess the accuracy of gear smoothness. Standard rules take any two of them combined inspection, in order to more fully control the impact of the accuracy of the gear cutting process error factor.