New Zn Multistep Hot Stamping Innovation
- 2018-10-24 10:49:00
- LUQIMENG Original
- 5388
ransfer press cycle times = cost reduction
Laser cutting process eliminated = cost reduction
Formability increased = more complex geometrical possibilities (Negative angles possible)
Zn-coated material = Cathodic corrosion protection
Tailored Properties as Soft-Zones, -Flanges, -Spots
Similar mechanical properties to conventional 22MnB5
No Microcracks > 10 µm
Prototypes available
Serial production line ready by the beginning of 2018
Offering to support today’s vehicle requirements, the most advanced and complete PHS solution.
Factors:
• Size of part
• Wet area vs not
• Customer Pref
• Joining tech
Base material (~22MnB5) zinc coated (GA )
with chemical modifications:
Si (anti self tempering)
Mn (hardenability)
- Mechanical properties similar to standard PHS
Basic Research Industrialization Global Implementation
Multistep GA
(not hardened)
Multistep GA
(short dwell time)
Multistep GA
(mid dwell time)
Multistep GA
(long dwell time)
Basic Research Industrialization Global Implementation
Process window and Industrial Validation
Best forming temperature
Microcrack containment
Trimming/Piercing temperatures
Mechanical properties
Material characterization analysis
Mechanical properties
Coating behavior and Corrosion
Formability
Bending tests
Tribology
2. Process definition
Heating possibilities
Shot blasting
Joining technologies (RSW/TWB)
Tailored properties (Flex laser / TPP)
Line Kickoff
Procurement Process
New Basement for Existing Press Line
Manufacture New Zn MSHc Line
Move Existing Press Line
Utilities for New Zn MSHc Line
Assemble & Commission New Zn MSHc Line
Production Trials & Training
Ready for Serial Production
Basic Research Industrialization Global Implementation
Material cost significantly different
Limited to 2000 ton, Bolster: 2.5 m x 6 m
Good for parts with significant laser content and up to 4 parts /
stroke
ase material
Modified version of the well-known 22MnB5
Similar mechanical properties to 22MnB5
Better formability at lower temperatures than 22MnB5
Zn-coating GA
Cathodic protection
Lower friction compared to AlSi coated material C omplex parts
Suitable for direct hot stamping process
Micro cracks under 10 µm
Hot Stamping process
High productivity due to short cycle time (aim 2-3 seconds)
No protective atmosphere required into the furnace
Multiple hits -Possibility to produce complex parts, negative angles
No Laser cutting is needed
Gestamp’s historical performance
1) Gestamp Hardtech > 30 years expierence
2) Quadrupled # Lines since 2007
3) Co-Development Partner BIW content 1% -38%
4) Driving the tailored material properties
Gestamp ‘growing’ forward
1) 1st to break 10 s cycle time
2) 1st to in-die soft zone
3) 1st to Multistep & eliminate laser
4) 1st to Hot Stamping cost reduction