The document discusses vacuum forming techniques. It describes the vacuum forming process, which involves heating a thermoplastic sheet, forming it over a mold using vacuum pressure, and allowing it to cool. Common techniques include positive forming, negative forming, and high pressure forming. The document also covers vacuum forming machine types, design considerations for forms, finishing processes, and examples of vacuum formed projects across various industries.
Talk about two projects, in their Astute project he will explain how interfaces can facilitate complex problems in all kinds of domains. In theirSmarcos project the interusability of devices is being investigated.
Talk about two projects, in their Astute project he will explain how interfaces can facilitate complex problems in all kinds of domains. In theirSmarcos project the interusability of devices is being investigated.
3. Vacuum forming ?
Thermoplastic, semimanufactured product
in plate form
p
3-D product
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
4. Vacuum forming - process
3 stages in the process
Heating up Forming Cooling
(plate thickness, sort of material)
thickness
(form place dependent)
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
5. Forming
Mould
Heated plate
Clamp system
p y
Temp. control
channels
Vacuum channel
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
8. Commonly used techniques
• Positive forming
– Usual positive forming
– Forming using pre-blowing
– Forming a vacuum
• Negative forming
– Usual negative forming
– Forming with stamp
– Forming using pre-blowing, stamp and vacuum
• Hi h pressure f
High forming (HPF)
i
• Twin sheet forming
g
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
25. High pressure forming (HPF)
At atmosphere High pressure
Acute
A t angles?
l ? •Almost always negative
•Acute angles no problem
•Adding texture to the surface is
possible
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
26. Negative HPF
• Variable wall thickness
• Adding texture to the surface is possible
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
27. Negative HPF with stamp
• Better division of wall thickness via stamp
• Adding texture to the surface is possible
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
28. Twin sheet forming
• 2 sheets are heated up simultaneously +
formed + welded
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
29. Design:
opportunities restrictions
• Variable wall thickness
Positive Negative
• 1 side with correct dimensions as a result of
contact with mould
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
30. Design:
opportunities restrictions
• Ideal angle
g
135 °, ideal 90°, good 60°, to be avoided
to be avoided better best
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
31. Design:
opportunities restrictions
• Conics
• A id undercuts, though they are possible
Avoid d t th h th ibl
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
32. Design:
opportunities restrictions
• Depth of draw
p
Stamp
necessary ?
•S
Secondary d
d draw Strong thinning of
wall thickness
Stamp from above
with controlled
ih ll d
temperature
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
33. Design:
opportunities restrictions
• Draw ratio
sum of all surfaces initial thickness
Draw ratio = =
initial surface average final thickness
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
34. Finishing
From plate to final product
Vacuum forming with
automatic loader
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
35. Finishing
From plate to final product
5-axis milling 3D measurement
bench
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
36. Projects
• Realised projects in very diverse domains
– Medical sector
– Automotive sector / transport
– Industry
– Design & display
– Art
– ...
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
37. Projects
• Medical sector
Part of radiology device Communication aid
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk