Abstract。 The paper describes the important role of Moldflow technology and status。 Through the application of Moldflow / MPI (Moldflow Plastics Insight) software for CAE under a comprehensive analysis of the shell molds, injection molding parameters such as mold temperature, melt temperature, injection time and injection pressure are used to simulate the actual production process。 This shows the Moldflow technology plays a significant role in the mold development process for optimizing plastic products design, plastic mold design and injection process parameters, etc。74969

Introduction

At present, most injection mold designers are based mainly on their years of experience in mold design。 Due to the persity, complexity of plastic workpieces and the limited experience of designers, it is difficult to accurately design a low-cost, short cycle, good quality products, qualified high rate of mold and craft programs, and designers often requires repeated continuously in order to tryout with the revised model formally put into production, some beyond repair due to the precision die scrap。

Moldflow technology[1] has a great advantage to improving productivity, ensure product quality, or

reduce costs, reduce labor intensity and so on。 Moldflow technology can be used in mold processing prior to use computers to simulate the entire injection molding process analysis, to predict the melt filling, packing, air traps, weld lines, temperature at flow front and warpage, etc。 [2-6], so that designers can early detection of problems, revise plastic parts and mold design, reduce and even avoid mold rework scrap, improve quality and reduce the cost of plastic parts and so on。 Moldflow technology has significant technical and economic significance。 In the paper, a plastic shell injection mold is selected as an flow analysis example, Moldflow software to optimize the design of molds for plastic injection products, mold filling, cooling, warpage and other behavior of the dynamic simulation for the products, mold design and determination of injection molding process parameters provides a theoretical basis in order to improve the quality of molding products。

Molding process analysis

The product for the plastic shell parts is shown in Fig。1, using ABS plastic, and the outer surface has the higher quality requirements。 In the paper, MPI module is used to process the product flow analysis。 In the analysis, through the process flow simulation analysis is determined the gate location, quantity and process conditions, and the process flow simulation is predicted the cavity pressure distribution, temperature distribution, clamping force size, etc。, for the actual molding to provide molding process parameters。

After completing the above analysis, the injection molding material is selected。 In the software, there are many large companies of products to choose from。 In the case material select ABS type, Parameter setting is in Tab。1。

Tab。1 Moldflow analysis parameter settings

injection molding temperature 230

Forming control Filling control Pressure 90MPa

Mold temperature Punch 55 speed/ pressure conversion automatic

Die 80 packing pressure control 80% injection pressure 6s

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MPI will automatically generate the best gate location of relevant information and to graphically display the best gate region, the deeper the color the more suitable area selected as a gate。 According to Fig。1 the plastic model shows a symmetrical structure, and the best location is the middle region in the paper。