CATIA逆向工程技术在注塑模具设计中的应用(中文2700字,英文1900字)
介绍了现代制造业中逆向工程的概念及逆向工程的一般方法和 CATIA软件的逆向功能模块, 以汽车仪表盘注塑模具为例, 说明利用 CATIA逆向工程技术设计注塑模具的具体过程, 包括点云滤除、网格铺面及网格面修补、创建边界特征曲线、重建曲面、曲面品质分析和建立 CAD模型。
在注塑模具开发制造过程中, 通常的流程是设计人员依据产品图纸绘制三维模型, 并根据零件材料的性质、设备的要求进行工艺修改 ,经计算机软件处理后生成数控加工设备的 NC文件 , 这种设计模式称为预定模式 。实际生产中 ,在只有实物样件、没有可参考图纸的情况下 , 由于注塑模具各面之间常采用圆滑过渡 ,部分制品的外形是由多个复杂的不同空间曲率的曲面连接而成, 用传统的方法很难测量, 无法采用预定模式进行设计。如果没有 CAD数字模型,就无法使用 CAD/CAM、多轴加工中心等先进的加工手段 。所以 , 设计人员需要通过一定的途径测量实物信息并转化为 CAD数字模型, 这就应用到了逆向工程技术 。笔者以汽车仪表盘注塑模具为例, 介绍 CATIA逆向工程技术在注塑模具设计中的应用 。
逆向工程是指用一定的测量手段对实物或模型进行测量, 根据测量数据通过三维几何建模的方法重构实物 CAD模型的过程.
This paper introduces the concept of reverse engineering in the modern manufacturing industry and the general method of reverse engineering and reverse function module of CATIA software, by car dashboard injection mould as an example, shows that using CATIA specific process of reverse engineering technology design of injection mould, including the point cloud filter, paving grid and grid surface repair, to create boundary characteristic curve, curved surface reconstruction and curved surface quality analysis and CAD model is set up.
In the process of injection mold development and manufacturing, the general process is to design personnel according to product drawing 3 d model, and according to the requirements of the properties of component materials, equipment, process modification, after computer software treatment to generate NC machining equipment NC file, this design pattern known as scheduled. In practical production, the only real samples, without a reference drawings, due to the injection mold is often used between the surface smooth transition, the appearance of some products is composed of multiple complex can be connected with the different spatial curvature of surface, with the traditional method is difficult to measure, cannot be ordered mode is adopted to improve the design. If there is no CAD digital model, can't use CAD/CAM, multi-axis machining center and other advanced processing means. Therefore, designers need to through certain ways of measuring physical information and translated into CAD digital model, it is applied to the reverse engineering technology. For car dashboard injection mould as an example, the author introduces the CATIA reverse engineering technology in the application of the injection mould design.
Reverse engineering is to point to in certain measurements to measure physical or model, according to the measured data reconstruction by using the method of 3 d geometric modeling physical process of CAD model. |
