CAJ | 학술논문

基于刚塑性有限元法,忽略了回弹和管坯与模具、芯轴的间隙的影响,建立了简化的有限元模型,对厚壁管压弯、压扁成形过程进行了数值模拟,得到了各场量的分布。根据应力分布结果,对起皱和破裂等缺陷进行分析预测,并根据截面变化情况,研究了芯轴对截面畸变的作用与影响。该研究对厚壁管件弯曲和扁化过程的工艺方法提供了依据。
기우강소성유한원법,홀략료회탄화관배여모구、심축적간극적영향,건립료간화적유한원모형,대후벽관압만、압편성형과정진행료수치모의,득도료각장량적분포。근거응력분포결과,대기추화파렬등결함진행분석예측,병근거절면변화정황,연구료심축대절면기변적작용여영향。해연구대후벽관건만곡화편화과정적공예방법제공료의거。
A rigid-plastic finite element model is applied to model bending and flattening process of the thick walled tube by neglecting the springback and the clearance between die and mandrel and tube, the distribution of relevent field has been obtained. The stress distribution in the tube can be used to analyze and predict the wrinking and cracking. In addition, influence of mandrel on cross section distortion in forming process has been studied by considering cross sectional deformation. The achievements of this study provide a guideline for bending and flattening process of thick-walled tube.