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通过对管材液压成形过程进行有限元仿真,构建管材内液体产生的压力与管材和模具之间接触压力的关系。为了揭示液体压强和表面粗糙度对摩擦系数的影响规律,提出一种管材和模具之间摩擦系数的有限元确定方法。采用商业有限元软件ABAQUS,基于表面粗糙度定义建立了管材液压成形二维有限元模型,模型包括管材和模具之间接触表面完全光滑和不同粗糙度的情况,其中粗糙表面轮廓采用正弦曲线表达。研究结果表明:接触压力与液体产生的压力偏差率值较小;液体压强越大,管材与模具之间的摩擦系数越小,而且摩擦系数变化曲线的导数越趋近于0;管材表面粗糙度越大,摩擦系数越大,但是摩擦系数的偏差并不明显。
Through the finite element simulation of the hydroforming process of the pipe, the relationship between the pressure generated by the liquid in the pipe and the contact pressure between the pipe and the die is established. In order to reveal the influence law of liquid pressure and surface roughness on the friction coefficient, a finite element method for determining the friction coefficient between pipe and die is proposed. The commercial finite element software ABAQUS was used to establish the two-dimensional hydroforming finite element model based on the surface roughness definition. The model consisted of completely smooth contact surfaces and different roughness between the pipe and the die. The rough surface profile was expressed by a sinusoidal curve. The results show that the contact pressure and liquid pressure deviation rate is small; the greater the liquid pressure, the smaller the friction coefficient between the pipe and the mold, and the derivative of the friction coefficient curve becomes closer to 0; the pipe surface roughness The larger the friction coefficient, but the deviation of the friction coefficient is not obvious.