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ELEVENTH INTERNATIONAL ALUMINUM EXTRUSION TECHNOLOGY
SEMINAR AND EXPOSITION
How to Benefit from
Isothermal Extrusion
Alexander Klaus
Constellium: a leader in innovative aluminium solutions for the automotive, aerospace & packaging industries
2
Over 10,000 full-time employees
€5.2 billion in sales
22 manufacturing sites
C-TEC, our world-class Technology Center
Headquartered in Amsterdam, The Netherlands.
Corporate offices in Paris, France, Zurich, Switzerland and
New York, USA
2015 key figures
Challenges
Reliability Stable process conditions,
controlled process
Productivity Ram speed, quality
Documentation Production data
Using temperature process control
Achieve constant profile exit temperature
Adapt ram speed and billet temperature /
taper to improve productivity
Collect detailed process data
Isothermal extrusion: billet taper
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40 Exit temp. (°C)
Ram speed (mm/s)
± 1,5°C
Set billet
temperature
480°C Taper
70°C/m
Exit temp.
variation
within measuring
accuracyConstant
ram speed
Ideal state
Constant speed
Constant exit temp.
Achieved by correct
billet taper
Die limit diagram + process control problem
Billet temperature
Ram
speed
Set exit temp
1
2
±20°C
±10%
surface
defects
max.
pressure
mech.
prop.
Process control
does not detect
Dimensional defects
Mech. properties
Surface defects
(only exit
temperature)
Process control
increases speed
Is that feasible?
Speed related quality problems
Surface defects
Linked to exit temperature
Not linked to exit temperature
Dimensional defects
Speed-sensitive dies
Quench distortion
Mechanical defects
High quench exit temperature
Metallurgical defects
Peripheral coarse grain
Quality gates during extrusion
Press Quench
Cold saw
Cooling table
Log furnace
Stacker
QualityLab
Q1
Q2
Q3
Quality gates during extrusion and
recipe management strategy
Quality gates
1. QGate – at the press
Outer surface
Simple dimensions
Quench settings
2. QGate – at the cold saw
Inner surface
Full geometry
3. QGate – at the quality lab
Mechanical properties
Metallurgical properties
Recipe management strategy
1. “Free Run”
Use TPC to increase speed
2. “Delayed Run”
Use TPC to current recipe
1 billet trial within order (higher speed)
Check at Q2
Use TPC to increase recipe
/ repeat / feed back
3. “Last Billet Run”
Use TPC to current recipe
1 billet trial at end of order
Check at Q3 / update recipe / repeat
product quality
can be fully
assessed