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本文根据杆的弹塑性弯曲理论,对已产生弹塑性弯曲的钻杆进行分析,从而导出了冷校时的校直力矩与校直前后的残余应力公式。为修订钻杆校直后的检验和使用规范以及校直机的改进提供了一点理论根据。
According to the elastic-plastic bending theory of the rod, this paper analyzes the elastic-plastic bent drill rod, and deduces the straightening torque and the residual stress formula before and after cold straightening. This provides a theoretical basis for the revision of the inspection and use specification of the drill pipe straightening and the improvement of the straightening machine.