材料成型控制自动化设计、生产

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Application and evaluation of VR-based CAPP system CAPP及其计算机系统集成技术在材料科学/材料加工与成型控制方面的运用 Materials Processing Technology

This paper proposes an approach to an integrated CAPP/VR system. A desktop VR environment is used to explore the machining process element of CAPP. An architecture of a virtual CAPP system is proposed based on an incorporated VR design interface, which can respond to the dynamic manufacturing process. The key problems under discussion are to find an effective method to quickly capture the 3D information from the manufacturing environment, and to define a uniform and well-organised structure of the program layout for achieving improved sharing of VR resources. Examples of the simulation for cutting process are supplied to demonstrate and verify the proposed CAPP/VR integration system.

Article Outline 1. Introduction 2. Applications of CAPP and VR 3. A virtual CAPP system 4. Capturing of user-based environments and modelling of objects 5. Manufacturing knowledge representation and acquisition 6. Definition of a uniform and well-organised structure for the virtual environment 7. Example and discussion 8. Conclusions

Integration of the CAD/CAPP/PPC systems The necessary condition that must be performed in order to ensure full functional integration of the computer aiding systems of technical and organizational production preparation is utilisation of the coherent product model. Utilisation of feature method for representations of the construction and the technological process elements is a key factor for integration of design and technological process planning—CAD/CAPP integration model. The availability of alternative process plans plays the main role in the CAPP/PPC system integration. The main advantage of the accessibility of alternative process plans for product is that we may fast react on a disturbance in the course of the manufacturing process by help of the reactions knowledgebase—one of the module of proposed PPC system. This paper describes a methodology for integration CAD/CAPP/PPC systems in detail.

Article Outline 1. Introduction 2. Integration of CAD/CAPP/PPC systems 2.1. Integration of CAD/CAPP systems by means of the features method 2.2. Constructional features 2.3. Technological features 2.4. Technological process preparation 3. The production scheduling and rescheduling with the multivariant technological processes consideration 3.1. The model of production flow 3.2. The method of production rescheduling 4. Conclusions

Solid-based CAPP for surface micromachined MEMS devices 材料成型/塑料模具设计软件 实体造型与加工中心/柔性制造 Computer-Aided Design 计算机辅助设计学报

Process planning for a MEMS device is almost always conducted manually by the designer to date. As the structures of MEMS devices become more and more complicated, in order to release the designers from the hard and tedious work and speed up the development of MEMS products, such a situation should be changed. In this study, a solid based CAPP method for surface micromachined MEMS device is presented. With this method, a MEMS device is designed with a traditional CAD system, and its process planning is conducted automatically based on the solid model created. The process features with engineering semantics are extracted first. Then, the process layer model is constructed with each process layer of the model being coincident with the fabrication layer of surface micromachining. Finally, the masks are synthesized and the fabrication process is generated. Furthermore, to guarantee the manufacturability of the designed MEMS device, a systematic evaluation method is proposed. The proposed design and CAPP methods enable designers to concentrate on functional and shape design of MEMS devices.

Article Outline 1. Introduction 2. Related work 3. Method overview 4. Process layer modeling 4.1. Initial manufacturability evaluation on the input solid model 4.2. Process feature recognition 4.3. Feature based process layer modeling 4.4. Process layer model adaptation for multi-layer etch 5. Manufacturability evaluation of process layer model 5.1. Contact evaluation of all process layers 5.2. Manufacturability evaluation of etching 5.2.1. SLEME 5.2.2. MLEME 6. Mask synthesis based on process layer model 6.1. Generation of the initial masks and process sequence 6.2. Generation of the final masks 7. Verification of the synthesized masks 8. Implementation 9. Conclusion

The method of knowledge representation for a CAPP system CAPP工艺规划/工艺设计系统中的一种知识表示方法 Materials Processing Technology 材料处理技术与工艺学学报