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梯形螺纹拉刀拉削内螺纹时须切除大量金属,作用于拉刀上的扭转应力相当高。如刀具设计不当,工作时容易被扭断。因此,刀具设计时必须进行强度计算。实践和计算证明,梯形螺纹拉刀工作时,作用在刀具上的主要是扭转应力,而拉应力仅为扭应力的8～5%,可略去不计;刀齿的抗弯强度通常已足够用,不必计算。本文所述只是验算拉刀容屑槽所允许的齿升量作用在刀具上的最大切削扭矩,它必须低于拉刀危险截面所允许的最大扭矩。
Trapezoidal thread broach when pulling the internal thread must be cut off a lot of metal, acting on the broach torsion stress is quite high. Such as improper tool design, work easily be broken. Therefore, the tool design must be intensity calculation. Practice and calculation show that trapezoidal thread broach work, the role of the tool is the main torsional stress, and tensile stress is only 8 to 5% of the torsional stress, can be neglected; flexural strength of the knife teeth is usually sufficient , Do not have to calculate. This document only checks the broach allowance of the flute to allow the maximum amount of cutting force on the tool, which must be less than the maximum allowable torque of the broach dangerous section.