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1、Integrated CAD/CAE/CAM system for injection mouldingby Yuan Zhongshuang, Li Dequn, Chen Xing, Ye Xiangao,Gao Xianke and Xiao JingrongHuazhong University of Science r|, y represent viscosity and shear rate; denotes an average over z, the gap wise co-ordinate; p, Cp and K are density, specific heat an
2、d heat conductivity of the melt, respectively; and b is the half gap thickness. Because the thickness dimension of an injection moulded part is often much smaller than the other two dimensions, a powerful numerical scheme, which is the hybrid of the finite element and finite difference methods (FEM/
3、FDM), is adopted in the solution. In the implementation of the scheme, the planar co-ordinates are described in terms of finite elements and the gapwise and time derivatives are expressed in terms of finite differences. A control volume approach is adopted to derive the finite-element formulation an
4、d track the melt front movement. By use of flow simulation, users can acquire information such as pressure, velocity and temperature distributions, total pressure drop, clamp force etc., which is very helpful in designing the deliver helpful in designing the delivery system and optimising the proces
5、s conditions. Users can also animate the filling of the cavity and obtain an optimum flow pattern by changing the number and locations of gates.Cooling simulation includes 3D steady and transient cooling analyses. The 3D steady cooling analysis uses the boundary element method (BEM). Formulas for mo
6、delling the cavity surfaces, cooling lines and exterior surfaces have been established and proven to be reliable and effective. Based on the steady cooling simulation, 3D transient cooling simulation has been developed. A novel BEM has been adopted in this module to eliminate numerical body integrat
7、ion. With the help of this module users can calculate heat transfer between cavity and cooling channels, reduce cooling time and predict temperature along mould and injection moulded part surfaces.All results of CAE modules can be displayed dynamically with contour plots, shaded colour images and va
8、rious curve plots to aid users in improving their design.Function of CAM moduleThe cutter location files can be created based on the geometry of cavity and core which is modelled at the previous CAD stage. NC tapes can then be generated by use of postprocessors for both NC wire cutting machine tools
9、 and NC milling machine tools. Currently only the function of NC wire cutting is used in practice. A lot of injection moulds have been designed and manufactured by using the system HSC-1.1 in factories in our country.ConclusionsHSC-1.1 is an integrated CAD/CAE/CAM system for injection moulding. All
10、programs in the system are independent of computers except a few programs for the graphic driver. It ensures the systems good portability. The modular structure of the system guarantees that each module of the system has good expandability and maintainability. The practice shows that HSC-1.1 is a po
11、werful tool for mould designing and manufacturing. It can assist engineers in cutting mould cost and improving mould quality. HSC-1.1 will find more and more applications in the mould industry.References1 WANG, K. K. : Polymer Plastics Technology Engineering, 1980, 1, p.752 MENGES, G.: Plastics Engi
12、neering, 1983, 8, p.373 KAMAL, M. R. etal.: Application of computer aided engineering in injection moulding (Hanser Publisher, 1987, p.247)4 AUSTIN, C: Application of computer aided engineering in injection moulding (Hanser Publisher, 1987, p. 137)5 WANG, V. W., Ph.D. thesis, Cornell University, 198
13、5 IEE: 1993 The authors are with Huazhong University of Science The plastic mold and the compression casting mold proportion increases; Specialized mold factory quantity and its productivity increase; “The three investments“ and the private enterprise develops rapidly; The joint stock system transfo
14、rmation step speeds up and so on. Distributes from the area looked, take Zhejiang Delta and Yangtze River delta as central southeast coastal area development quickly to mid-west area, south development quickly to north. At present develops quickest, the mold produces the most centralized province is
15、 Guangdong and Zhejiang, places such as Jiangsu, Shanghai, Anhui and Shandong also has a bigger development in recent years.Although our country mold total quantity had at present achieved the suitable scale, the mold level also has the very big enhancement, after but design manufacture horizontal o
16、verall rise and fall industry developed country and so on Yu De, America, date, France, Italy many. The current existence question and the disparity mainly display in following several aspects:(1) The total quantity falls short of demand Domestic mold assembling one rate only, about 70%. Low-grade mold, center upscale mold assembling oneself rate only has 50% about.(2) the enterprise organizational structure, the product structure, the technical structure and the import and export stru
