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基于MSC.MARC有限元软件建立了推弯成形有限元模型,采用实验与数值模拟相结合的方法研究了不锈钢管材推弯成形工艺过程。结果表明:在管材内、外侧壁厚与应力分布规律方面,有限元模拟和实验研究的结果一致,且外侧脊线的残余压应力随所处位置角度的增加而先增加后减小,在一定位置又再次增加,验证了模型的可靠性。通过研究不同摩擦系数与润滑条件下管材内、外侧壁厚与椭圆度的变化规律,得到润滑条件对推弯成形质量的影响。研究表明,在一定范围内,管材外侧壁的壁厚减薄量随着摩擦系数的增加而减小,但是内侧壁壁厚增厚则随着摩擦系数的增加而加剧,管材端面椭圆度随摩擦系数的增加而略有减小。在大弯曲半径推弯时,良好的润滑条件有利于减轻内侧壁增厚问题且能获得更好的成形质量。
Based on MSC.MARC finite element software, a finite element model of push forming was established. The process of push forming of stainless steel pipe was studied by a combination of experimental and numerical simulation. The results show that the results of the finite element simulation and experimental study agree well with the distribution laws of wall thickness and stress inside and outside the pipe, and the residual compressive stress of the lateral ridges increases first and then decreases with the increase of the location angle. In a certain position Once again, the reliability of the model was verified. The influence of lubrication conditions on the forming quality of push-bend was obtained by studying the variation rules of inner and outer wall thickness and ellipticity under different friction coefficient and lubrication conditions. The results show that within a certain range, the thickness reduction of the outer wall of the pipe decreases with the increase of the friction coefficient, but the thickening of the inner wall increases with the increase of the friction coefficient. The ellipticity of the pipe end surface increases with the friction The coefficient increases slightly with a slight decrease. Good bending conditions help to reduce the problem of thickening of the inner wall and achieve better forming quality at high bending radius buckling.