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Pertanika J. Sci. this is because almost 70% of the plastic product shapes are similar, so changeable inserts are used in this case. Core insert will be as permanent insert and change the slider and cavity insert for T G Clip version and T G Stick version. Plate 11 shows the cavity and core insert for T G Clip and Stick version. PertanikaJ. Sci. this means it can enhance quality in the mould design by reducing in the number of errors. Application of CAD/CAM and the Methods for Mould Design In this project, the type of CAD/CAM software employed is Pro/Engineer 2000i. Prof Moldesign is an extension of Pro/Engineer to the mould manufacturing environment, covering all aspects of production mould design such as mould bases, runner system creation, waterlines, ejector-pin holes, shrinkage and hundreds of other features. The Plate 14 for mould assembly is using Pro/Moldesign to create and design the mould. Prof C and Pro/MFG are the manufacturing extensions of Pro/Engineer into C C production arena, .and have a wide breadth of capabilities covering from 3 to 5 axis milling, 2 and 4 axis wire EDM, turning, laser, flame, etc. After designing all the moulds, Pro/NC and Pro/MFG for the manufacturing will play an important role again in the process of creating the detail drawing needed and generating C toolpaths to machine the actual mould. The C toolpaths are derived from the product model database. Product paths completed in 3-D model will be directly extracted from the mould design database for manufacturing, for example, core inserts from the mould database that want to do some manufacturing. Before starting CAD/ CAM some of the important features have to be considered like tool feed rate, spindle speed, step depth, material to mill, Plunger speed, coordinate system, and what kind of end mill used. To start CAD/CAM, dimension ofwork piece has to be decided first and then setting the coordinate system to the work piece. The work piece coordinate must be of the same setting with the coordinate in the CNC machine. The wrong setting will cause the machine to crash with the work piece. Decide what kind of manufacturing process to use, for example profiling, volume, pocketing, hole-making and conventional surface. After selecting the manufacturing process, Prof C will convert computer code to PertanikaJ. Sci. so using CAD/CAM will enhance quality of the work in the mould design and reduce the number of errors in manufacturing. From the analysis simulation, Moldflow provides sufficient information results such as fill time, injection pressure and pressure drop. With this result, users can avoid the defect of the plastic in actual injection such as sink mark, hesitation, air traps, and overpacking. The analysis will also help the mould designer to design a perfect mould with minimum modifications and it will also reduce the mould setup time. With this analysis and simulation it will help to reduce time and cost. 98 PertanikaJ. Sci. & Techno!. Supplement Va!. 12 No.2, 2004 Design and Simulation of Plastic Injection Moulding Process Pr I Design Model I I Workpiece I -1 Manufacturing Model j.- / Machine Tools (Workcells) I Fixture Setup Set Up Manufacturing Database 1 Tools .1 Set Up Operation II 1 o/MFG 1 Define NC Sequences 1 1 I 1 I Create CL Data Files I 1 Produce In- Process Model I I Post-Process 1 1 I Drive NC Machine Tool I Fig. 3: Summarizes the Pro/MFG process REFERENCES FRADos, J. 1976. Plastic Engineering Handbook (The Society oj the Plastic Industry). Fourth edition. Van NostRand Reinhole Company. Moldflow Help Files. CAMPBELL, P.D.Q. 1996. Plastic Component Design. First edition. New York, USA: Industrial Press Inc. Pro/MFG and Pro/NC-CHECK Users guide, Release 18. ROSATO, D.Y. 1986. Injection Molding Handbook. Applied Publisher Ltd. Essex. BECK, R.D. and V. NOSTRAND. 1980. Plastic Product Design. Second edition. Reinhold Company. PertanikaJ. Sci. & Techno!. Supplement Vo!. 12 No.2, 2004 99