这种弯管机由钢制机架、下模、上模、夹具、液压系统和内胎等组成，其工作原理是通过确定合理的支点和受力点并施加弯曲力矩，使钢管发生塑性变形，实现钢管的冷弯曲。
By determining rational fulcrum and force bearing point, and applying bending torque to cause the plastic deformation of the steel pipe, it can realize the cool bending of the pipe.
本文按材料的幂强化模型推导了工程中板材塑性弯卷时弯板力矩的计算公式。
In this paper, the calculating formula of bending moment plastically rolling plates was developed for power-hardening materials.
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