2.008 Review1TopicsProcessPlanningDFMInjectionMoldingThermoformingCuttingAssemblyJoining2Problem 134What are some of the problems with making this part using the kindof mill we have in our lab?5Problem 2In an injection molding operation, what are the consequences of thefollowing:• Temp too high• Temp too low• Pressure too high• Pressure too low• Cooling time too low• Shot size too big6Problem 3:Injection MoldingDraw a profile of cavity pressure as a function of time.7Problem 4:Injection MoldingThis Yogurt cup cap has a diameter of 2.75'' and a thickness of0.040''. How many of these can I make simulaneosly with an IM machinethat is rate at 90ton clamping force and a 3.0 in3shot size. One makingjust one such lid, a test run required 9000 psi to get a full shot.8Problem 5Why and where do sink marks form on injection molded parts?9Problem 6How does our injection molding machine melt the plastic?10Problem 7Where does Copper fit on this graph. [interaction time versus heatintensity].11Problem 8vtn= CExplain the qualitative significance of this formula.12Problem 9What does the Jacobs number mean qualitatively?J =cp(To− Tmelt)hfs13MeltingHow much energy does it require to melt that projector up there?1410Power is the specific cutting energy times the material removal rate.Lets use this to solve problem 2 on problem set
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