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数控弯管工艺是传统弯管工艺结合机床数控技术而产生的一种新工艺，可实现加工过程的自动化，但由于工件结构、加工尺寸和材料往往没有固定规格，而弯曲所需力矩与这些尺寸呈现非线性关系，这就给数控弯管设备针对工件选择电机带来不便，对此通过理论推导，得出弯管力矩的计算公式，由此确定弯管力矩，既能提高计算效率，又能减少试验成本。通过采用数值模拟和实物试验的方法对理论公式进行验证，证明了其准确性，可用于解决工程实际问题。“,”The combination of the traditional pipe-bending technology and the CNC technology of machine tool make the pipe bending process automation. However,there is no fixed size and material specifications. Moreover, the non-linear relationship between the bending moment and the sizes brings troubles in choosing an electric ma-chine of the CNC pipe-bending device. Therefore,this paper presents a formula to calculate the pipe-bending mo-ment,for improving the calculating efficiency and reducing the testing cost. The numerical simulation and experi-mental test were carried out to verify the accuracy of the formula,respectively. The result shows that the presented formula is effective in solving the engineering problems.