3_4564927_本科毕业论文外文翻译-A geometric approach for injection mould filling simulation.docVIP

本科毕业论文外文翻译-A geometric approach for injection mould filling simulation A geometric approach for injection mould filling simulation C.K. Au* School of Mechanical and Production Engineering, Nanyang Technological University, 50 Nanyang Ave, 639798 Singapore Received 15 March 2004; received in revised form 7 June 2004; accepted 15 June 2004 Abstract This paper investigates a geometric technique for generating flow fronts arising from a point gate, in a bounded cavity, with obstacles?a problem which often requires intensive computations for its solution. The technique is based on the assumption that flow velocity is proportional to the plastic part wall thickness. A complex flow pattern in the cavity of an injection mould is constituted by four types of basic flow patterns, four flowpat terns quickly generates the filling pattern in an injection moulding which is useful in the conceptual design stage during the plastic product development. Although the context of application discussed is in plastic injection moulding, the technique is applicable in numerous sareas. # 2004 Elsevier Ltd. All rights reserved. Keywords: Flow fronts; Mould filling simulation; Injection moulding Introduction The manufacturing operation of forming requires moulds for plastics and polymers or dies for metal,liquid or sheet. As important as the industry is, the bulk of the work on tools and dies in the last twenty years is largely developmental, boundary conditions. Intellectually, at the phenomenological level, a lot has already been done to model the flow of melt in a mould cavity. Solutions to fluid flow problems are abundantly available by the various techniques such as the finite element method and numerical integration schemes. Yet, at the particulate level where atoms or molecules interact, there is a large amount of current activity. Perhaps stimulated by the promise in biotechnology and nanotechnology, biologists, chemists, mate