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

Info iconThis preview shows pages 1–15. Sign up to view the full content.

View Full Document Right Arrow Icon
2.008 Review 1
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Topics Proces s Planning DFM Injectio n Molding Thermoforming Cutting Assembly Joining 2
Background image of page 2
Problem 1 3
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
4
Background image of page 4
What are some of the problems with making this part using the kind of mill we have in our lab? 5
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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
Background image of page 6
Problem 3:Injection Molding Draw a profile of cavity pressure as a function of time. 7
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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.
Background image of page 8
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 10
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 12
Background image of page 13

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 14
Background image of page 15
This is the end of the preview. Sign up to access the rest of the document.

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...
View Full Document

This note was uploaded on 02/24/2012 for the course MECHANICAL 2.008 taught by Professor Jung-hoonchun during the Spring '04 term at MIT.

Page1 / 15

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

This preview shows document pages 1 - 15. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online