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网络环境基于特征参数化模具CAD/CAM研究
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摘要
本论文主要讨论在网络环境下如何利用网络资源进行CAD/CAM设计,通过Internet(国际互联网)或Intranet(企业内部网)共享CAD/CAM设计数据。全文以辊锻件各道次毛坯件三维造型及其对应的模具型腔设计为例,阐述如何采用特征参数化的技术在Internet和Intranet环境下,实现关键截面二维CAD设计,然后利用二维的关键截面特征信息,在三维设计软件SolidWorks中采用纵向轮廓引导线约束的方法,对二维关键截面进行放样扫描,构造出各道次三维实体模型。为了造型出各道次模具型槽,针对辊锻成型属于回转压缩局部成形的特点,论文提出采用虚拟中间过渡体作为模型信息载体进行辊锻模具型槽设计的新方法,中间过渡体技术实现锻件毛坯三维信息向其模具传递,虚拟中间过渡体继承辊锻件毛坯的三维参数,同时又被附着了辊锻模设计中的各种数据,如前滑后滑数据等,利用布尔运算的方法,在辊轮基体上生成辊锻模具的三维型槽。
     在CAM方面,先对上述CAD中生成的辊锻模具的三维型槽进行实体合法性检查,确认为有效的实体后再展开CAM过程。CAM过程中重要的一步是选择各种CAM参数,为了避免查阅大量的手册,设计了基于B/S和C/S两种模式下的CAM参数查询系统,在系统中实现了相关参数的内部关联,极大地方便了CAM参数设定。针对辊锻模具型槽的曲面特点,经过反复模拟,确定采用四轴旋转法加工模具型腔,根据仿真模拟结果对加工参数进行优化,并得到了加工刀路文件(NCI)和基于FANUC数控系统的专用文件(NC)。
     通过上述辊锻件设计、辊锻模设计、模具加工计算机模拟,研究了目前制造业先进的产品设计、模具设计和模具制造一体化新思想。
This paper set focus on how to use network resource for CAD/CAM under web environment and how to share the data of CAD/CAM through Internet & Intranet. It took the 3D design of roll-forging mold and the 3D design of its roughcasts for example to illustrate feature-based parameter-driven CAD/CAM under Internet & Intranet environment. Firstly, designed the 2D key section based on Internet or Intranet. Secondly, swept the key section restrained by lengthways contour to construct the roughcast. Thirdly, in order to gain the mold of roughcasts, consider of the special deformation of roll forging, we introduced a new object named virtual middle dummy .The virtual middle dummy took the 2-D information to the 3-D mold. Virtual middle dummy inherited the 3D parameters from roll-forging roughcast, and at the other hand it was attached the parameters of roll-forging mold, such as the parameters of forward slide and the backward slide. Finally, used Boolean method to build the roll-forging mold on mold base.
    As for CAM, firstly, verified above-mentioned roll-forging mold solid, because a solid with flaw can't be took into CAM process. In CAM process, it's a important step to choose machining parameters. To avoid looking them up in many handbooks, a CAM parameters query system based on B/S & C/S was designed. In this system different parameters were related in order to simplify CAM design work. Finally, through carefully analyzing the inner surface of roll-forging mold we took the 4 axes revolving machining method to simulate the process of mold machining, and optimized the machining parameters, got the NCI file and FANUC system NC file.
    From design of 3D roll-forging roughcasts, design of roll-forging mold and manufacture simulating of mold, author tried to illustrate the whole process of design and manufacture aided with computer. This is the main route that modern factories recently take.
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