【正文】 (Canada) and KKWang (America), etc. to carry out a series of plastic melt in the moldtype cavity flow and cooling of basic research. At a reasonable simplification, based on 60 years pleted a onedimensional flow and cooling analysis programs, 70 years to plete the twodimensional cooling analysis programs, and 80 years from the injection molding CAE technology has begun to theoretical research into the practical phase, launched a threedimensional flow and cooling analysis and the study extended to packing, fiber orientation and warpage prediction of molecular and other fields. After 90 years carried out into the flow, packing, cooling and stress analysis, the whole process of injection molding processes are integrated research. CAE technologies, for the injection mold design provides a reliable guarantee that its application is mold design in the history of a major change. 2 The role of Injection Molding CAE technology It shows the design of injection molds using traditional methods and the use of injection molding CAE technical design features and differences in mold. It can be seen using traditional methods of design of injection mold design success will rely heavily on the experience of designers, but also for plex parts gate position is reasonable or not, the location of the exhaust slot settings, to determine the location of weld lines and so very difficult. Die in delivery will normally take before the test mode after repeated changes, until the products have been qualified, which inevitably led to the extension of the production cycle, and generally difficult to obtain an optimal design and process parameters. The use of injection molding CAE technical design, mold is not true, because of mold design concept stage, can make use of CAE technology in injection molding process simulation flow, making usually only in the mold tryout phases in order to find problems, such as short shots, weld lines or holes appear in the surface appearance of parts and other issues have been avoided. While helping the designer to plete the balance of the system, such as flow channel design, exhaust ducts, setting, rationally determine the injection molding process parameters, etc., so that usually makes the modification must be repeated tryout to determine structural parameters of the mold die design and process parameters in the conceptual stage able to determine, reduce the mold design and manufacturing cycle and improve the mold design quality. Therefore, the role of injection molding CAE software, mainly as follows: (1) Optimize design of plastic products Plastic wall thickness, gate number and location of the design of flow channel system for the quality of plastic products have a significant impact. Depends on the experience of the past, designers using manual methods to achieve, timeconsuming effort, but the use of CAE technology to quickly design the best products. (2) optimize the plastic mold design Can be cavity size, gate location and number of flow channel dimensions and cooling systems to optimize the design. On the puter simulation test mold, mold repair mold and improve quality and reduce the number of actual tryout. (3) to optimize injection process parameters Simulation of the injection process and found possible shape defects, to determine the best injection pressure, clamping force, mold temperature, melt temperature, injection time and cooling time. This shows that the injection molding CAE technology in terms of improving productivity, reduce mold design and manufacture cycle and to ensure product quality, or reduce costs, reduce labor intensity and so on, have very significant technical advantages and economic significance. 3 Injection Molding CAE software types and their details To date, a mature business are more injection molding CAE software, Moldflow Corporation Moldflow software and ACTech, Inc. (February 2020, was Moldflow Merger) and CMold software is an excellent representative。s Taiwan region Moldexpeer software applications are relatively wide。s range of products, the pany issued since 1976, the world39。s Fusion analysis Fusion (double flow) analysis technique is based on Moldflow39。s biggest advantage is that the model greatly shorten the preparation time, thus greatly reducing the burden on the user modeling, will take several hours or even days of the original modeling work reduced to a few minutes. Therefore, based on doublesided flow simulation software technology, although the advent