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在圆弧齿螺旋锥齿轮的测绘工作中,要测定其螺旋角。螺旋角的定义是:在齿轮中点上,齿面节线的切线与过此点的节锥母线所成的角度(如图3所示)用β_m表示。这是一个空间角度,直接测量比较困难,所以经常在测绘时都采用滚印法,但此法精度太低,误差约有±2°。这里介绍一种较为精确的办法,其精度能满足较为精密的螺旋角之测绘要求。一、刀盘直径的确定测绘时首先必须确定刀盘直径。格里森制的圆弧齿锥齿轮,其刀盘直径是系列化的,即为3(1/2)″、6″、7(1/2)″、9″、12″、18″、21″。间隔部比较大,这有一个方便之处,即可以用否
In the arc tooth bevel gear mapping work, to determine the helix angle. The definition of the helix angle is: At the mid-point of the gear, the angle formed by the tangential line of the tooth surface nodal line and the pitch cone bus bar passing through this point (as shown in Figure 3) is expressed as β_m. This is a spatial perspective, the direct measurement is more difficult, so often used in the mapping of rolling method, but the accuracy of this method is too low, the error is about ± 2 °. Here is a more accurate way to introduce the accuracy of the helical angle to meet the more precise mapping requirements. First, determine the cutter diameter First of all must be determined cutter diameter mapping. Gleason arc bevel gear, the cutter diameter is a series of, that is 3 (1/2) “, 6”, 7 (1/2) “, 9”, 12 “, 18” 21 ". Spacers are larger, and there is a handy place to use that