【作者】 曲先锋；

【导师】 胡平；

【作者基本信息】 吉林大学 ， 车身工程， 2008， 硕士

【摘要】 本文围绕基于特征的冲压件快速成形仿真软件的开发工作展开。涉及的内容有一步逆成形有限元法的基本理论,特征技术,在UG/NX6开发平台下开发的One-step Formability Analysis软件的界面及其功能,基于特征开发的功能模块,以及对软件进行了实例验证。本文介绍了在UG/NX6开发平台上One-step Formability Analysis软件的UI主界面、参数设置界面和约束设置界面及其功能;叙述了前处理中新添加的指定回弹评定点、网格质量检查等功能;以回弹facet body显示云图为例,介绍了后处理的显示功能。本文重点介绍One-step Formability Analysis软件的特征功能模块的开发,给出了程序流程图,叙述了特征功能的实现过程,并给出了实例演算。最后,本文以典型算例说明One-step Formability Analysis软件具有CAD与CAE无缝集成;支持基于物理迭代的钣金件展开、基于空间的曲面展开和空间分离部件展开的功能与特点。更多还原

【Abstract】 During the automotive design and manufacture period, it is the main factor of auto product development speed and quality that the design and manufacture level of the auto body die especially auto panel die.The work of the present paper is finished based on development of One-step Formability Analysis (integration product of Kmas/One-Step solver with UG/NX) with support of National Vehicle Electrical Industry High-tech Project“CAD/CAE/CAM software platform for digital lean design and manufacturing of auto-body part”(Project No.: Department of High-tech industry of National Development and Reform Commission 2040) and commission project of UGS PLM Solutions company’s software functionality development (Project ID 901PC). This paper mainly finishes key development technique, functionality and solution of One-Step Formability Analysison UG/NX6; and development the feature function of One-Step Formability Analysis.One-step Formability Analysis, software is developed based on UG/NX6. It utilizes UG’s newest user interface technique and internal code to complete pre-processor, post-processor and UI design, then integrates Kmas/One-Step solver by invoking its dynamic link libraries. By the two issues, it implements all the functionalities of formability analysis software, including UI, pre-processor, post-processor and solver. The pre-processor achieves closer integration between CAD and CAE software. After selecting un-form region, boundary conditions, draw directions and pushing“Mesh”button in CAD mode of preprocess, the application would enter CAE mode to create mesh, read mesh datum, and then return back to CAD mode to do calculation and display result. Both entering CAE interface and going back to CAD interface are completed automatically in the application and not needed for manually operation of users. In pre-processor, the use of the former feature technology is for the realization of CAE parameters of operation, that is, when the CAD model of the system has changed, that of the corresponding system CAE converse at the same time.One-step Formability Analysis could work under two modes: un-form and intermediate un-form, which offer potent tool for the designer of the pressing die and progressive die. The application scope of that is not only limited to the tamping parts and die designs of automotive industry , can but also provide effective support to the product design and industry analysis of sheet metal stamping parts on electronics, household widely appliances.Besides, the One-step Formability Analysis which based on feature offer following enhanced functions:λIn the constraint, the user can specify three springback match points for springback assessment. In the actual production of pressing on the springback of the measurement method is to make the three points of pressing part rely on the same standard components respective and three springback become 0 points, followed by measuring the resilience of other points . Now, after adding a user input rebound assessed match point interface, the output will be more in line with the actual work.λProvided quality checks for input mesh. Before computing by solver, quality of mesh should be checked. If the quality of mesh can meet the requirements, then do the calculation, otherwise feed back the user corresponding information and re-transmission mesh is required. Quality of mesh determines the quality and efficiency of solver directly. Poor quality of input mesh often leads to much longer calculating, inaccuracies of results, even failure which is wasting time of users. This function improves efficiency of the work and accuracy of the solution.λIntermediate un-form supports that of separate parts. The two parts could flatten on the target region,or one part flattens on the region of another part. That could compare the flattening shapes. Have some practical significance.λSpringback displayed change from single nephogram to display two ways of the nephogram and output the facetbody of UG . When users computed springback, they not only concerned about the greatest resilience of the part, but also wish to get the specific shape of the part after doing springback. Adding the output of facetbody , the user can obtain the model of the parts after springback computing through facetbody, and then use for the follow-up analysis, optimization.λAdding the attributes of the feature. The One-step Formability Analysis software can not only preserve the results of this set of parameters, information of mesh and calculation information in the analysis of the document , but also record the un-form region, constraint curves, materials and other parameters, moreover edit this information.更多还原