拉刀在切削过程中所受的作用力,一般只能引起它的拉伸,但在某种情况下拉伸又与弯曲共同发生。若拉刀齿和拉刀中心是对称分布的话,而拉刀本身(图1)则仅承受拉力。在这种情况下,拉刀的强度计算,与一般计算拉力相同。所不同的只是在计算时必须考虑齿槽间由於横截面尺寸突变所产生 Broach in the cutting process by the force, generally can only cause it to stretch, but in some cases stretching and bending together. If the broach teeth and broach center symmetrical distribution, then the broach itself (Figure 1) is only subjected to tension. In this case, the broach’s strength is calculated the same as the normal calculated tension. The difference is only in the calculation must consider the alveolar spaces due to a sudden change in size