【作者】 张桃旺；

【导师】 黄菊花；

【作者基本信息】 南昌大学 ， 材料加工工程， 2005， 硕士

【摘要】 摩擦与润滑状态是影响金属板料成形工艺的一个重要因素,因此在数值模拟过程中,为了获得更加准确的模拟结果,就必须对板料成形过程中的摩擦行为进行准确的描述。而要达到此目的,就需要更加符合实际的摩擦模型以及利用软件的二次开发功能对摩擦模型进行二次开发,并将其应用于模拟过程中。 1)基于摩擦学理论和金属塑性加工理论,建立了流体润滑条件下轴对称件拉深成形过程中摩擦阻力与表面粗糙度、润滑剂及相对滑动速度等之间的关系模型。 2)分析了板料拉深成形过程中不同区域的摩擦行为及其对应的摩擦模型。 3)对ABAQUS软件的子程序二次开发进行了分析,根据模具与板料之间的动态接触状态的变化及不同的区域采用不同的摩擦模型,编写了相应子程序。 4)设计制作了一模拟实验系统,探讨了板料拉深成形过程中摩擦状态的变化规律。而且还利用了探针摩擦测试装置对盒形件拉深成形过程摩擦系数进行了测试。 5)利用ABAQUS/Explicit有限元分析软件,将所编的摩擦模型二次开发子程序应用于圆筒件拉深和盒形件拉深过程有限元模拟,并矩形盒形件模拟结果与其探针摩擦系数测试实验结果进行了对比,结果表明应用本文中的摩擦模型及二次开发子程序的正确性及可行性。更多还原

【Abstract】 The friction and lubrication status is a very important factor that influences the sheet metal forming. To gain more accurate analog result, the friction behaviors should be described well and truly in the sheet forming simulation system. And to attain this purpose, the more accurate friction model and the user subroutine of the friction model should be applied in the simulation system.1)Studying friction behaviors in sheet metal forming process, the author established the friction models of full film lubrication and mixed lubrication according to the ratio between the film thickness and the surface roughness of die and sheet blank.2)This paper have studied the friction behaviors in deep drawing and the friction model in different region of die and sheet blank.3)In the paper, the ABAQUS software and the user subroutine have been studied. Furthermore, the programs of the friction models have been second exploited based on the VFRIC and the different friction models.4) In the end, in order to test and investigate the dynamic variation of friction in experimental approach, the author developed a experimental system based on the existing condition. And, the laws of friction coefficient variation with the forming parameters are determined based on the experimental system and tribotest system developed by the Shanghai Jiao Tong University.5)A three-dimension finite element model by the ABAQUS/Explicit software for analyzing the effect of friction in deep drawing has been developed based on both tribological and metal processing theories. In the last,the simulation results has been compared with the experiment results, which show the friction models are right.更多还原