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STUDY ON MICROWAVE DIELECTRIC PROPERTIES OF EPOXY RESIN MIXTURES USED FOR rapid product development

Acta Metallurgica Sinica(English Letters) 2001年第1期14卷 1-12页

作者： P.K.D. V. Yarlagadda (School of Mechanical, Manufacturing and Medical Engineering Queensland University of Technology (QUT) George Street, Brisbane, Qld 4001, Australia) School of Mechanical Manufacturing and Medical Engineering Queensland University of Technology (QUT)

This paper presents a preliminary study on the dielectric properties and curing of three different types of epoxy resins mixed at various stoichiometric mixture of hardener, flydust and aluminium powder under microwave energy. In this work, the curing process of thin layers of epoxy resins using microwave radiation was investigated as an alternative technique that can' be implemented to develop a new rapid product development technique. In this study it was observed that the curing time and temperature were a function of the percentage of hardener and fillers presence in the epoxy resins. Initially dielectric properties of epoxy resins with hardener were measured which was directly correlated to the curing process in order to understand the properties of cured specimen. Tensile tests were conducted on the three different types of epoxy resins with hardener and fillers. Modifying dielectric properties of the mixtures a significant decrease in curing time was observed. In order to study the microstructural changes of cured specimen the morphology of the fracture surface was carried out by using scanning electron microscopy.

关键词： microwave curing time epoxy resin rapid product development

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Integrated product and Process Design Using a Reverse Engineering System

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厦门大学学报（自然科学版） 2002年第S1期41卷 184-185页

作者： A Ajmal T S Tat School of Engineering South Bank UniversitySchool of Engineering South Bank University UKUK

Computer-integrated manufacturing (CIM) and revers e engineering (RE) have changed drastically the concept of product re-design, pla nning and manufacture of components. However, the main problems currently facing the developers of reverse engineering system, is the time consuming digitis ation of 3D data and the conversion of large amounts of data into a concise and manageable format and linking it to a CAD/CAM system. Automated 3-D profile gen eration, measurements and inspection of manufactured component represents one of the important functions in reverse engineering and in the improvements in produ ct quality in rapid product developments. The paper presents a novel methodology for the development of a reverse enginee ring technique for use in the rapid product development in a CIM environment . The system developed provides integration, data capture and manipulation, dat a transfer between a CAD, CAM, Computer-aided inspection (CAI) and a 3-D profi le scanning system. An efficient scanning strategy has been developed for scann ing and surfaces data acquisition. The products were scanned using a laser scann ing system with a dedicated scan control card and the associated software packag es. A versatile rig was developed for the ease of data gathering of the profile scanning process. The surface data collected was then used to build a mathematic al surface model, which was then used to develop a virtual 3-D model of the pro duct. The resulting surface model provides the geometrical input to the subseque nt machining operation using either a CNC system or other manufacturing operatio n e.g. dies casting/mould casting etc. The prototypes developed were inspected u sing a state-of-the art CNC-CMM that was integrated to the CAD/CAM system. Si nce the scanning/digitised data captured by laser scanning probes requires no ma nual editing, significant time saving over most non-contact probe systems was a chieved. Since the creation of an accurate CAD model of a redesign

关键词： rapid product development reverse engineering C omputer-Integrated Manufacturing (CIM) re-engineering Co-ordinate Measuring Machines (CMM)

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rapid Prototyping and Manufacturing Technology and Its Integration with CIMS

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Tsinghua Science and Technology 1996年第2期1卷 162-166页

作者：王建国颜永年杜昭辉 Department of Mechanical Engineering Tsinghua Universtiy Beijing 100084

Recent developments of rapid prototyping and manufaturing (RP&M)technology are discussed. To facilitate application of RP&M technology as an enabling technology in product development and manufacturing, our center has done a series of pojects covering RP theory (modern shaping science), new RP processes and equipment,rapid tooling technology and rapid product development systems. With the STEP protocol and product modeling technology, RP&M technology can be integrated into CIMS to form a new subsystem, the free form manufacturing subsystem. The subsystem architecture is investigated in this paper.

关键词： rapid prototyping and manufacturing (RP&M) modern shaping science rapid tooling rapid product development free form manufacturing CIMS

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