针对高速剪切技术中影响断面质量的重要参数之一速度,从裂纹扩展角度出发,结合断裂力学关于裂纹的应变能密度理论和液气剪切机的运动力学特性,推导出径向夹紧状态下高速剪切适宜下料速度的理论表达式,并给出合理的临界剪切速度范围,有助于该项新技术的推广应用。 Aiming at the speed of the high-speed shearing technology, which is one of the important parameters that affect the quality of the cross-section, from the crack propagation angle, combined with the strain energy density theory of the crack mechanics and the kinematic characteristics of the liquid shearer, the radial clamping state Under the high-speed shear cutting speed suitable for the theoretical expression, and gives a reasonable range of critical shear rate, contribute to the popularization and application of the new technology.