【作者】 韦红余；

【导师】 高霖；

【作者基本信息】 南京航空航天大学 ， 航空宇航制造工程， 2005， 硕士

【摘要】 数字化渐进成形是目前国际上一种新兴的金属板料成形工艺。该工艺实际上是一种点压延渐进成形技术,不需要专用模具或采用简单模具,就可以通过数控设备加工出成形极限较大,形状复杂的板材零件。本文围绕数字化渐进成形样机系统设计、成形工艺、成形零件壁厚分布等展开研究。根据成形过程,成形工具在金属板料表面的运动与普通数控加工中铣削运动相似的特点,本文开发了一套专用系统,将现代数控技术应用于金属板料渐进成形。渐进成形中,零件表面几何形状一般都比较复杂,难以进行手工编程。本文详细阐述了如何利用 UGNX 软件进行成形工艺规划,进而生成成形工具的加工路径,从而实现渐进成形的计算机辅助编程。零件壁厚分布是薄壁零件设计时一个重要的考虑因素。本文在研究分析金属板料在渐进成形过程中材料变形机理的基础上,将渐进成形分为两类:胀形类数字化渐进成形和拉深类数字化渐进成形。研究发现在胀形类数字化渐进成形工艺中,成形零件的壁厚分布总符合一特定的数学公式。在此基础上本文开发了一应用软件模块。利用该软件模块可以方便地对胀形类渐进成形零件的壁厚分布进行预报,并将分布结果以彩色图云的形式显示在计算机屏幕上。对于拉伸类数字化渐进成形,由于其成形过程变形机理非常复杂,很难用简单的数学公式来计算其零件的壁厚,在本研究中,提出了一种基于有限单元法思想的方法-“虚拟靠模导向法”,用来估算变形后零件的壁厚分布。上述研究成果都已应用于金属板料数字化渐进成形。更多还原

【Abstract】 Digital Incremental Forming is a new technology and process that just has beensprang up in the world used for sheet metal forming. In fact this is one kind of pointpress process. During the process, a special forming tool, which controlled by onespecial CNC machine, that moves on sheet metal’s surface sequentially. And anexpected article with complicated shape will be deformed. This thesis focused on thespecial CNC system, forming process, and thickness distribution of the formed part,e.c. During process, the movement of the forming tool is similar to milling.According to this, a special CNC system, used for incremental forming has beendeveloped in this paper. Due to the complicated surface of the formed part, it isdifficult to program NC programmes by hand. A CAM method, used for generatingforming tool’s tool path by UGNX, has been advanced in this paper. Thickness distribution is a very important factor to be considered in designingsheet metal parts, also the same to the parts that formed by incremental forming (ordieless forming) process. In this study, thickness distribution of the formed part hasbeen investigated. And a general equation for thickness calculation at any point of thebulge type formed part has been concluded. Based on this general equation, asoftware module has been developed to predict the thickness distribution by coloredcloud map. Because the deformed mechanism is very complex in the extending typeprocess, no simple equation can been concluded like the bulge type. An acceptableapproach, based on FEM method, to generate 3D forming path, called “virtualguiding model method” is advanced to estimate the thickness of the extending typeformed part.更多还原