ENGR 410: Polymer Processing Compression Molding Outline 2011

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29 Νοε 2013 (πριν από 3 χρόνια και 6 μήνες)

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ENGR 410
: Polymer

Processing

Compression

Molding

O
utline

2011


Process overview

a.

Overview

b.

Movies from
YouTube; SMC

c.

History (include local history)

d.

Advantages

e.

Limitations

f.

CPI in Winona


Processing parameters

a.

Amount of charge

b.

Molding pressure

c.

Closing speed

d.

Mold temp.

e.

Charge temp.

f.

Cycle time

g.

Charge shape

h.

Charge placement

i.

Plots to show T and P variables


Press

a.

Press capacity

b.

Required force per part

c.

Hydr
aulic ram

d.

Down stroke and upstroke presses

e.

Day light opening

f.

General guideline

for pressure need


Mold

a.

B
asic mold requirement

b.

Mold elements

c.

Mold closure types: flash, positive,
semi
-
positive

d.

Mold material: tool steel, stainless
stee


General part design
consideration


a.

No undercuts

b.

Large parts

c.

Relatively simple design

d.

Inserts


Mathematical model

a.

Estimate required pressure (page
655 Strong)



Material consideration

a.

Rheology of polymers

b.

Liquid, paste, dough, granules,
SMC, pre
-
forms

c.

Fiber length

d.

Fiber
orientation



Troubleshooting



Related processes

a.

Injection/compression

b.

Transfer compression molding

c.

Cold forming

d.

CPI process


Software

a.

The Madison

Group

b.

PASSAGE/COMPRESSION



References

a.

Strong Brent, Plastics: Materials and
Processing

b.