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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: **9 Calculate clamp force, & shot sizeF=P X A = 420 lbs = 2245 cm3=75 ozActual.

Note; a Tool > a polymer Boundary Conditions: 1-dimensional heat conduction equation : The boundary condition of 1st kind applies to injection molding since the tool is often maintained at a constant temperature q x q x + Dq x Fourier’s law 12

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