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Injection Molding - MIT
Injection GutowskiD. Roylance1V-6 air intake manifoldWater control valveBrass Vs Injection history of plastics1866 Celluloid1891 Rayon1907 Bakelite1913 Cellophane1926 PVC1933 Polyethylene1938 Teflon1939 Nylon stockings1957 velcro1967 The Graduate 1970 Earth Day recycling 3 Ref Kalpakjian and SchmidMcCrum, Buckley, Bucknall4 OutlineBasic operationCycle time and heat transferFlow and solidificationPart designToolingNew developmentsEnvironment530 ton, fl oz (45 cm3) EngelInjection Molding Machinefor wheel fabrication6 Process & machine schematics** Source: *Schematic of thermoplastic Injection Molding machine7 Process OperationTemperature: barrel zones, tool, die zonePressures: Injection max, holdTimes: Injection , hold, tool openingShot size: screw window8 Typical pressure/temperature cycleTime(sec)Cooling time generally dominates cycle timeTime(sec)* Source.
Non-Isothermal Flow v Flow rate: 1/t ~V/L x Heat transfer rate: 1/t ~a/(L z /2)2 For injection molding For Die casting of aluminum Very small value for aluminum requires thicker runners Small value => Short shot Péclet No. 19
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