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# review - 8 Problem 5 Why and where do sink marks form on...

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2.008 Review 1

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Topics Proces s Planning DFM Injectio n Molding Thermoforming Cutting Assembly Joining 2
Problem 1 3

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4
What are some of the problems with making this part using the kind of mill we have in our lab? 5

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Problem 2 In an injection molding operation, what are the consequences of the following: Temp too high Temp too low Pressure too high Pressure too low Cooling time too low Shot size too big 6
Problem 3:Injection Molding Draw a profile of cavity pressure as a function of time. 7

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Problem 4:Injection Molding This Yogurt cup cap has a diameter of 2.75’’ and a thickness of 0.040’’. How many of these can I make simulaneosly with an IM machine that is rate at 90ton clamping force and a 3.0 in 3 shot size. One making just one such lid, a test run required 9000 psi to get a full shot.

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Unformatted text preview: 8 Problem 5 Why and where do sink marks form on injection molded parts? 9 Problem 6 How does our injection molding machine melt the plastic? 10 Problem 7 Where does Copper fit on this graph. [interaction time versus heat intensity]. 11 Problem 8 vt n = C Explain the qualitative significance of this formula. 12 Problem 9 What does the Jacobs number mean qualitatively? J = c p ( T o-T melt ) h fs 13 Melting How much energy does it require to melt that projector up there? 14 10 Power is the specific cutting energy times the material removal rate. Lets use this to solve problem 2 on problem set 4. 15...
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review - 8 Problem 5 Why and where do sink marks form on...

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