Date post: | 26-May-2015 |
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CCCLEMCLEM
VACUUM FORMINGVACUUM FORMINGVACUUM FORMING VACUUM FORMING
dHr. Verheust V.
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
Overview• Vacuum forming ?
• Commonly used techniques
• Design: opportunities restrictions
• Finishing g
• Projectsj
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
Vacuum forming ?Thermoplastic, semimanufactured product in plate form p
3-D product
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
Vacuum forming - process
3 stages in the process
Heating up Forming Cooling
(plate thickness sort of material)(plate thickness, sort of material)(form place dependent)
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
Forming
Heated plateMould
Clamp systemp y
Temp. control channels
Vacuum channel
channels
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
Forming machines 2 basic concepts 2 basic concepts
• Single-station (discontinuous)
• Multi-station(quasi-continuous)(q )
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
Forming machines
Single-station Multi-station (carrousel)
3 different treatment stations(loading/unloading, heating, forming)
1 treatment station
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
(loading/unloading, heating, forming)
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 f i (HPF)• High pressure forming (HPF)• Twin sheet forming g
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
Usual positive forming
Heating
Elastic
iForming
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
Usual positive forming
V i bl ll hi k improvement via• Variable wall thickness improvement viapre-blowing or
vacuum• Inside – correct dimensions
vacuum
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
Application
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
Positive forming + pre-blowing
• Better division of wall thickness via pre-blowing
1. Pre-blowing
2. Vacuum
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
Positive forming + pre-blowing
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
Applications
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
Application
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
Positive forming + vacuum
• Better division of wall thickness via vacuum
Vacuum
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
Application
Lighting hood (base: 500 x 350)
(h i ht 600)(height: 600)
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
Negative forming
Variable wall thickness
Vacuum
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
Negative forming
Improvement via• Variable wall thickness Improvement via stamp
• Outside – correct dimensions
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
Application
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
Negative with stamp • Better division of wall thickness via stamp
1. Stamp1. Stamp stretching
2 V2. Vacuum
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
Applications
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
Negative forming with pre-Negative forming with preblowing, stamp and vacuum
• Better division of wall thickness Better division of wall thickness
1. Pre-blowing
2 St2. Stamp stretching
3. Vacuum
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
Applications
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
High pressure forming (HPF)
At atmosphere High pressure
A t l ?Acute angles? •Almost always negative
•Acute angles no problem
•Adding texture to the surface is possible
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
Negative HPF
• Variable wall thickness • Adding texture to the surface is possible
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
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
Twin sheet forming
• 2 sheets are heated up simultaneously + formed + welded
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
Design:Design:opportunities restrictionsopportunities 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
Design:Design:opportunities restrictions
• Ideal angle
opportunities restrictions g
135 °, ideal 90°, good 60°, to be avoided
to be avoided better best
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
Design:Design:opportunities restrictions
• Conics
opportunities restrictions
A id d t th h th ibl• Avoid undercuts, though they are possible
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
Design:Design:opportunities restrictions
• Depth of draw
opportunities restrictions p
Stamp necessary ?necessary ?
S d d• Secondary draw Strong thinning of wall thickness
Stamp from above i h ll d
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
with controlled temperature
Design:Design:opportunities restrictions
• Draw ratio
opportunities restrictions
initial thickness average final thickness
Draw ratio = sum of all surfaces initial surface
=
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
FinishingFrom plate to final product
Vacuum forming with automatic loader
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
automatic loader
FinishingFrom plate to final product
5-axis milling 3D measurement bench
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
bench
Projects
• Realised projects in very diverse domains – Medical sector
Automotive sector / transport– Automotive sector / transport– Industry– Design & display– Art – ...
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
Projects
• Medical sector
Part of radiology device Communication aid
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
Projects
• Automotive sector / transport
Bodywork Roof part
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
Projects
• Industry
Housing of a loom Internal door
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
Projects
• Design & display
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk
Projects
• Art
Pieces of scenery
CLEM N.V. Spinnerijkaai 39, B-8500 Kortrijk