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普通圆板牙的三跳,即外圆及端面对螺纹中心线的偏摆跳动,切削刃对外圆的斜向圆跳动,一直是圆板牙生产过程中的难点,而板牙丝锥的攻丝质量是影响其中两跳(外圆及端面对螺纹中心线的偏摆跳动)的关键.目前多数工具厂使用的板牙丝锥均不能很好地保证两跳(尤其是M6以下规格的圆板牙).为了提高圆板牙的位置精度,笔者通过分析研究,在原板牙丝锥的基础上稍作改动,设计出带前导向的板牙丝锥(见图1)d孔为圆板牙攻丝前底孔直径E为圆板牙厚度从圆板牙攻丝过程中得知,为防止损伤已加工的螺纹,圆板牙攻丝后从柄部取出板牙丝锥,为了在攻丝机方孔卡头上快速方便地装入极牙丝锥,一般攻丝机方孔卡头比丝锥方头尺寸大0.20～0.25mm;而丝锥的切削锥角为0°40′,这样在攻丝时,普通圆板牙丝锥就可能产生外圆及端面对螺纹中心线的角度偏差——外圆及端面对螺纹中心线的偏摆跳动(见图2).
Three rounds of ordinary circular die teeth, that is, the outer circle and the end of the thread centerline runout bouncing, cutting edge of the outer circle of circular beating, has been a circular plate teeth in the production process of the difficulty, and taping taping quality is Which affects the two jumps (the outer circle and the end face of the thread centerline runout bounce) the key.At present, most of the tools used in the factory do not tap the two jumps (especially the following specifications M6 disc teeth) Improve the position accuracy of the circular plate teeth, the author through analysis and study, based on the original plate taps to make some changes to design with a front-oriented billet tap (see Figure 1) d hole for the tooth before tapping the bottom hole diameter E for the circular die Thickness from the circular tooth tapping process that, in order to prevent damage to the thread has been processed, after the circular tooth tapping from the handle to take out the tap, in order to tapping machine square hole chuck quick and easy into the tooth tap, General tapping machine square hole tap square head than the tap size 0.20 ~ 0.25mm; and taper cutting taper angle of 0 ° 40 ’, so tapping, the ordinary circular taps may have a cylindrical outer ring and end face pairs Angular deviation of thread centerline - outer circle and end face thread Yaw beating heart line (see FIG. 2).