APT 1-Day Seminar 180413 Birmingham
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Transcript of APT 1-Day Seminar 180413 Birmingham
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2013-04-18
Susanna WeinbergerTechnical Manager Oerlikon Balzers Sandvik Coating AB
Press hardening
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Austenitizing
Forming andQuenching Blanking
22MnB5
Ferrite-PerliteRm 600 MPa
MartensiteRm > 1500 MPa
Temperature difference Relative movement Al/Si-coating or oxide scales
Excessive wear
Press hardeningProcess challenges
Source: LFT Friedrich-Alexander University Nrnberg-Erlangen
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OC Oerlikon Balzers AG
Press hardeningDirect process of uncoated sheet material
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Ploughing of tool surface by iron oxide particles
SEM picture of tempereduncoated steel sheet (22MnB5)
SEM picture of wornuncoated tool surface
Extreme abrasive wear at elevated temperature due
to ploughing of iron oxide
particles
Uncoated sheet after tempering
Big iron oxide wear particles (up to 2 m size)
Source: Rovalma
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OC Oerlikon Balzers AG
Press hardeningDirect process of coated sheet material
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Less Ploughing of tool surface by Al-Si oxides
Cross section of AlSi coated steelsheet (USIBOR)
SEM picture of wornuncoated tool surface
Severe sticking of AlSi-coating on tool surface
little abrasive wear at elevated temperature
Coated sheet after heating at 950 C
Source: Rovalma
2m 2m
Material built up
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Type of metal sheet
USIBOR (AlSi coated)
22MnB5 (uncoated)
Phs-ultraform (zinc coated) (1)
GammaProtect (zinc coated) (1)
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Abrasive/adhesive wear
Abrasive/adhesive wear
Extreme abrasive wear (3)
Adhesive wear (2)
Application problem
Sheet types in presshardening process
Press hardeningCoating selection
(2) Sticking of AlSi-coating on tool surface(3) Formation of scale on the sheet surface acts like a grinding powder
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BALINIT ALCRONA
BALINIT LUMENA
Solution
(4) For casted steel tools or big tool dimension
(1) Phs-ultraform indirect process, GammaProtect direct process
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Important coating properties
Friction coefficient
Oxidation resistance
Residual stress
Hardness/Ductility
Hot hardnessChemical
stability against the workpiece
material
Thermophysical properties
Abrasive wear resistance
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OC Oerlikon Balzers AG
Coating propertiesAbrasive wear resistance at elevated temperatures
Clear benefit of AlCrN (ALCRONA) compared to TiAlN (LUMENA)
20C
500C
700C
20C
500C
700C
(AlCrN) ALCRONA (TiAlN) LUMENA
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550 600 650 700 750 800 850 900 950 1000 1050 1100 1150 1200
Comparison with titanium-based coatings
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Oxidation temperature [C]
Completely oxidised
BALINIT B BALINIT LUMENA
BALINIT X.CEED
Holding time hour in ambient atmoshpere
BALINIT ALCRONAOxidation resistance
BALINIT ALCRONA
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Nakajima test with BALINIT ALCRONA coated punch
Friction behaviourNakajima test
Source: LFT Friedrich-Alexander University Nrnberg-Erlangen
Test condition
Sheet metal Arcelor USIBOR
Sheet temperature 900C
Heating duration 10 min
Tool temperature 620C
Punch radius 50 mm
Test device
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ALCRONA coated 1st testALCRONA coated 2nd testuncoated 1st testuncoated 2nd test
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Improved friction conditions yield in a more homogeneous forming process
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BALINIT treatment benefits
BALINIT treatment benefits
Tool lifetime extended for around 100% in some cases (especially bumper tools) up to 200%
Added benefits:
No repair welding necessary Less maintenance Less press downtime due to reduced
cleaning cycles (for USIBOR material)
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coated tools:- bumper - door beam- B-pillar- roof rail- sill
Application examples BALINIT ALCRONAUncoated steel sheet
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Coating thickness : > 8
Application examples BALINIT LUMENACoated steel sheet
Bumper tool Roof rail
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Application examples BALINIT LUMENACoated steel sheet
B-pillar
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Werkzeug Sule B Limo/AvantApplication examples PPDCoated steel sheet
B-pillar PPD process picture
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Detailed App Description Automotive Hot Stamping
Type of produced part B Pillar
Application Problem Scale formation it should be
Type of metal sheet Uncoated sheet
Tool steel H13
Coating type BALINIT ALCRONA DUPLEX
Pre-Post treatments Pre and Post Polish
FEEDBACK
Application result Over 500k hits to date.
Additional Feedback Tool Failure with no coating at 200k
Application examples BALINIT ALCRONAuncoated steel sheet
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Thank you
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