热成型技术的发展及其对汽车轻量化的影响
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Niobium Tech Asia
March 15, 2011
Press Hardening Advanced Technology to reduce the Weight of Vehicles for Today and Future
边箭
1
Niobium Tech Asia
March 15, 2011
亚太地区铌钢技术咨询公司 巴西矿冶公司技术顾问， 巴西矿冶公司技术顾问，中国中信金属公司合作伙伴
ThyssenKrupp
东北大学
JFE
设计院 安徽合肥
新加坡
CBMM
2
Niobium Tech Asia
March 15, 2011
Strategy of light weight
DP1000 TRIP1000 CP1000 MS1200
节能 环保 安全
Conventional process
<5% in use
(U)HSS Press hardening
铌合金(Nb) 铌合金
15% in use
PH1500
light weight concepts
Light metals
Plastic and carbon fiber
3
Niobium Tech Asia
March 15, 2011
Press hardening
State of the art
Press hardening process Press hardening steels Surface coating Application in the BIW
New development
Process technology Higher strength steels for press hardening
Press hardening in China
4
Niobium Tech Asia
March 15, 2011
Press hardening
State of the art
Press hardening process Press hardening steels Surface coating Application in the BIW
New development
Process technology Higher strength steels for press hardening
Press hardening in China
5
Niobium Tech Asia
March 15, 2011
Why press hardening
140 120
Weight reduction
Estimated weight reduction
+ 15-25 % Reference
100
- 5–10%
-10–15%
-20–30%
-20–40%
Weight
80 60 40
20
0 Mild Steel HSLA DP-600 TRIP-800 Press hardening steel DP-800 Aluminum
6
Niobium Tech Asia
March 15, 2011
Why press hardening
Euro NCAP crash tests
crash performance
Bumper reinforcement Side impact beam Roof frame B-pillar Dash panel Tunnel C-pillar Sill Side member Bumper reinforcement A-pillar
7
Niobium Tech Asia
March 15, 2011
Process Technology
Direct hot stamping (one step) / 22MnB5
Heating to 880 ° C–950 ° C
Hot stamping and press hardening in cooled die
Die or laser trimming
Indirect hot stamping (two steps) / 22MnB5
Cold stamping
Heating to 880 ° C–950 ° C
Hot stamping and press hardening in cooled die
Die or laser trimming
Sand blasting
8
Niobium Tech Asia
March 15, 2011
Temperature
Temperature profile and micro structure development
Austenitisation Transfer of plate Closing of die
Press hardening Opening of stamp
Micro structure before hot stamping
Micro structure after hot stamping
Time
9
Niobium Tech Asia
March 15, 2011
Mechanical properties of 22MnB5
70
Condition before press hardening (hot)
60
Deep drawing steels and conventional high-strength steels FB-W RA-K DP
Tensile strength up to 1500 MPa Great BH potential Good hardenability Good weldability Suitable for coating/painting
Elongation A (%)
50 40 30 20 10 0
MS Condition as delivered (cold) CP
22MnB5
100 200 300 400 500 600 700 800 900 100011001200130014001500160017001800
Tensile strength Rm (MPa)
10