ahss technology in the 2005 jeep grand cherokee (jim …/media/files/autosteel/great designs in...
TRANSCRIPT
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w w w . a u t o s t e e l . o r g
Advanced High-Strength Steel Technology in the 2005 Jeep
Grand Cherokee
James M. Prencipe, Jr.DaimlerChrysler Corporation
March 9, 2005
DAIMLERCHRYSLER
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w w w . a u t o s t e e l . o r g
Advanced High-Strength Steel Technology in the 2005 Jeep
Grand Cherokee
Acknowledgements
John Siekirk – DCX ASMEGanesh Kalpundi – DCX CAE
Greg Hemingway – DCX WK Product TeamRon Hamilton – DCX Advanced Vehicle Engineering
Carl Fait and John Yank – Tower AutomotiveChris Meloche – AZ Automotive
DAIMLERCHRYSLER
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2005 Grand Cherokee
4-Wheel & Off-Road – 4x4 of the Year
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2005 Grand CherokeeDetroit Free Press – Truck of the Year
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2005 Grand Cherokee
Texas Auto Writers Association – Mid-Size SUV of the Year
Truckin’ SUV – SUV of the Year
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• AHSS Materials– Dual Phase 590– Hot Stamped Martensitic
• Crash Events– Crash Energy Management– Anti-Intrusion Control
• Product and Manufacturing Development– Formability Challenges– Dimensional Control Challenges– Tooling and Tool Wear Challenges
Advanced High Strength Steel Applications
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Advanced High Strength Steel Applications
Components and Material Selection
Dual Phase 590
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FRONT OFVEHICLE
Rail Assemblies
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FRONT OFVEHICLE
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Rail Assemblies Exploded View
Front Rail Outer
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FRONT OFVEHICLE
1.85 mm
Hot Dip GA-DP590
Front Rail Outer
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FRONT OFVEHICLE
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Rail Assemblies Exploded View
Front Rail Inner
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FRONT OFVEHICLE
Rail Front Inner
1.95 mm
Hot Dip GA-DP590
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FRONT OFVEHICLE
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Rail Assemblies Exploded View
Reinforcement - Front Rail U-Channel
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FRONT OFVEHICLE
Reinforcement – Front Rail U-Channel
1.80 mm
Hot Dip GA-DP590
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FRONT OFVEHICLE
DAIMLERCHRYSLER
Rail Assemblies Exploded View
Front Rail Rear
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FRONT OFVEHICLE
Rail Front Rear
2.21 mm
Hot Dip Ga-DP590
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FRONT OFVEHICLE
DAIMLERCHRYSLER
Rail Assemblies Exploded View
Reinforcement Shock Tower
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FRONT OF
VEHICLE
DAIMLERCHRYSLER
Reinforcement Shock Tower
1.40 mm
Hot Dip GI DP590
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FRONT OFVEHICLE
DAIMLERCHRYSLER
Rail Assemblies Exploded View
Rear Rails
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FRONT OFVEHICLE
Rear Rails
2.01 mm
Hot Dip GA-DP590
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A-Pillar Front Upper
1.70 mm
Hot Dip GA DP590
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A-Pillar Rear Upper Extension
1.70 mmHot Dip GA DP590
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GA DP5901.40 mmBrkt-Cradle Mounting Front
GA DP5902.01 mmRnf-Sill Inner Bracket
GA DP5901.70 mmA-Pillar Rear Upper Extension
GA DP5901.70 mmA-Pillar Front Upper
GI DP5901.40 mmRnf-Shock Tower
GA DP5902.01 mmRear Rail
GA DP5902.21 mmFront Rail Rear
GA DP5901.80 mmRnf-Front Rail U-Channel
GA DP5901.95 mmFront Rail Inner
GA DP5901.85 mmFront Rail Outer
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Advanced High Strength Steel Applications
Components and Material Selection
Hot Stamped Martensitic Components
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Steel Grade – SAE 15B22 ModifiedCarbon – 0.20/0.25%Manganese – 1.0/1.3%Boron – 0.0015/0.0050%
Coil Platine Presse
Direct hot stamping
Coil Blank Furnace RobotPress
Cooling system
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LEFT HAND SIDE VIEW
Rear Door Impact Beam
Front Door Impact Beam
2.1 mm 15B22 Mod
1.7 mm 15B22 Mod
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WK Front Impact Beam
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WK Rear Impact Beam
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Crash Energy Management
Advanced High Strength Steel Applications
Crash Events
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35 mph Flat Frontal•Accordion crush of DP590 Rail Tip•Low Intrusion
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40 mph Front Offset• Body Cage Intact• DP590 A-Plr Reinf.• Low Intrusion
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50 mph Rear Offset• DP590 Rear Rails• Rear Load Path• Protected Zone
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Intrusion Control
Advanced High Strength Steel Applications
Crash Events
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38.5 mph Crabbed Side Impact• B-pillar Engagement• Hot-stamped door beams• Low Intrusion
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Formability Challenges
Dimensional Control Challenges
Tooling and Tool Wear Challenges
Product and Manufacturing Development
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• Splits• Edge Cracking/Stretch Splits• Shear Fracture
Product and Manufacturing Development
Formability Challenges
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Front Rail Outer
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Front Rail Rear
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Front Rail Rear
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Shear Fracture
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• Springback• Sidewall Curl• Twist
Product and Manufacturing Development
Dimensional Control Issues
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Rear Rail
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• Tight radii• Let it curl in draw and overstrike and allow to
spring back to final required dimension• Control curl by optimizing material flow
– Variable Binder Control/Force
Possible Solutions
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Case-1: CBF
Binder Travel
BF
Forc
e
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Case-1: CBF
Binder Travel
BF
Forc
e
Case-2: VBF-LH
Binder Travel
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Case-1: CBF
Binder Travel
BF
Forc
e
Case-2: VBF-LH
Binder Travel
Case-3: VBF-MLH
Binder Travel
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Constant Binder Force (CBF)
Variable Binder Pressure (M-L-H)
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• Higher Forming Forces• High Heat Generation During Stamping
Product and Manufacturing Development
Tooling and Tool Wear Challenges
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DAIMLERCHRYSLER
• Die Materials• Lubrication
– Wet Lubes– Dry Film Lubes
• Die Treatments
Possible Solutions
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DAIMLERCHRYSLER
2005 Grand Cherokee
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Great Designs in Steel is Sponsored by:•AK Steel Corporation•Dofasco Inc.
•Severstal North America Inc.•United States Steel Corporation
•Mittal Steel Company•Nucor Corporation