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Software 30 MoldMaking Technology May 2015 applications early in the process. It also can ensure that a system is designed correctly and will perform as desired. Simulation of the induction heating process, combined with injection molding simulation, shows not only the effect of coil placement and process settings on the mold temperatures, but their effect on the final plastic product as well. Insight gathered from these analyses can help users make informed decisions about the placement and design of induction coils, cooling channels and other mold components to optimize the final prod- uct and cycle times. The two most important things to review when evaluating an induction heating system are 1) that heating is occurring in the proper locations on the mold and 2) that the surface is being heated to the desired temperature. Temperature plots show the temperature over the entire thickness of the mold at any time in the molding process (see Figure 5). Critical points on the mold surface must remain above the glass-transition tem- perature as the melt front passes in order to By machining grooves into the mold where the induction coils will rest, nearly all the power generated will be focused on the mold surface, allowing the rear of the mold to stay cold. Simulation can show the temperature through the entire thickness of the mold at any time in the molding cycle, enabling evaluation of the effectiveness of the induction heating system. FIGURE 5 Magnetic feld plots show the areas of the mold where electromagnetic heating will be focused and can be used to help design the induction coil layout and placement of magnetic mold inserts. FIGURE 6 FIGURE 4 (a) Cylindrical Hole (b) Groove (c) Deep Groove 144.3 121.2 98.04 74.91 51.78 [C] Temperature, Mold (Transient) Time = 6.558[s] 1.662 1.259 0.8561 0.4530 0.0500 [Tesla] Magnetic Flux Density, Real Part = 1.662[Tesla] Scale (100 mm) Scale (100 mm)