圆梳刀切削螺纹时切削刃对坯件中心的超出量是梳刀的重要结构要素,直接影响螺纹的螺距精度和齿形光洁度。超出量偏小时梳刀切削部分及校准部分的后角部都可能是正值,使切头自动旋进能力变差,也影响切头自动张开性能;超出量过大时梳刀后角只在很短一段切削部分是正值,而在梳刀 Round comb knife cutting thread over the amount of blanking the center of the knife is an important component of the comb, a direct impact on the thread pitch accuracy and tooth finish. Exceeding amount is too small, comb cutting part and the calibration part of the rear corner may be positive, so that cut into the head automatically deteriorating ability, but also affect the cutting head automatically open performance; excessive amount of excess comb knife angle In a short section of the cutting section is positive, while in the comb knife