从2003年4月份开始，在欧洲金融共同体的支持下，一个技术研究组织（CRAFT）历时长达24个月，对微型塑料组件的注射模具进行微铣削这个项目进行研究。在Fraunhofer Instltute of Production Technology（IPT），该项目涉及从技术提供到...从2003年4月份开始，在欧洲金融共同体的支持下，一个技术研究组织（CRAFT）历时长达24个月，对微型塑料组件的注射模具进行微铣削这个项目进行研究。在Fraunhofer Instltute of Production Technology（IPT），该项目涉及从技术提供到微型加工整个过程，包括CAD／CAM软件供应商（Cimatron），铣削机床商（Kern）等。展开更多
3D solid models for parts with regular-form surfaces (PRFSs) are effectively generated using traditional parametric design techniques. A new model is obtained by changing some parameters defining the model. The parts ...3D solid models for parts with regular-form surfaces (PRFSs) are effectively generated using traditional parametric design techniques. A new model is obtained by changing some parameters defining the model. The parts with free-form surfaces (PFFSs), however, cannot be defined by several parameters. Usually they are defined by some geometric elements like profile curves. The traditional parametric design approaches have not easily dealt with the PFFSs. A method for generating a solid model and an engineering drawing for PFFSs is proposed in this paper: First, the new profiles are generated from input point data. Second, the profile information is extracted from the existing model. Last, the old profiles are replaced with the new profiles. This method can preserve the associative information of the existing model and automatically generate the drawing including views, dimen- sions, and annotations. The proposed method has been implemented using a commercial CAD/CAM system, Unigraphics, and API functions written in C-language, and were applied to the blades of a turbine generator. Some illustrative examples are pro- vided in order to show the effectiveness of the proposed method.展开更多
文摘从2003年4月份开始，在欧洲金融共同体的支持下，一个技术研究组织（CRAFT）历时长达24个月，对微型塑料组件的注射模具进行微铣削这个项目进行研究。在Fraunhofer Instltute of Production Technology（IPT），该项目涉及从技术提供到微型加工整个过程，包括CAD／CAM软件供应商（Cimatron），铣削机床商（Kern）等。
文摘3D solid models for parts with regular-form surfaces (PRFSs) are effectively generated using traditional parametric design techniques. A new model is obtained by changing some parameters defining the model. The parts with free-form surfaces (PFFSs), however, cannot be defined by several parameters. Usually they are defined by some geometric elements like profile curves. The traditional parametric design approaches have not easily dealt with the PFFSs. A method for generating a solid model and an engineering drawing for PFFSs is proposed in this paper: First, the new profiles are generated from input point data. Second, the profile information is extracted from the existing model. Last, the old profiles are replaced with the new profiles. This method can preserve the associative information of the existing model and automatically generate the drawing including views, dimen- sions, and annotations. The proposed method has been implemented using a commercial CAD/CAM system, Unigraphics, and API functions written in C-language, and were applied to the blades of a turbine generator. Some illustrative examples are pro- vided in order to show the effectiveness of the proposed method.
