1. MS Autotec 2008013404 Lee Gun-Min Intro – make be safe and green Secret 1 – Local heat treatment Secret 2 – Hot stamping Secret 3 – Hydrofoming Final Secret – TWB Summary Index

2. Intro - make be safety and green  How Satisfy it?  hardness car is safe. Is it true ?  Eco-friendly Not all recycle and prevent pollution. We must have to reduce use material and energy Yes, but think about when you hitted by hardness hammer. Car’s Safety was be consider both driver and walker In summary, car bumper needs control of impact and car frame need toughness

3. Local heat treatment High tensile strength Low tensile strength One material have two type strength. → unnecessary adding material → Lightweightunnecessary

4. Hot stamping Heating First heating Second heating result part (High-frequency heating) 550 ~ 750 ºC 930 ºC ↑ 마텐자이트 ~ 400 ºC 750 ºC ↓ 페라이트 + 펄라이트 High-temperature heating Low-temperature heating Hot stamping & Quenching Stamping and Quenching At the same time. It reduce making line → need small place, low price In adition upgrade quality Help you 1 1 2 2 *Question : why did they help?

5. Hydro-forming http://www.hysco.com/html/rd/ulsan/geabal_1_01.aspx

6. TWB (Tailored Welded Blank) Individual steel sheets of different thickness, strength and coating are joined together by laser welding. Reduce weight, Structural and crash performance is improved

7. Summary  Low wehigt car is very dengerous?  Eco-friendly?