MS Autotec

MS Autotec2008013404 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

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

Local heat treatment

High tensile strength

Low tensile strength

One material have two type strength. → unnecessary adding material → Lightweight

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 & QuenchingStamping and Quenching At the same time.It reduce making line → need small place, low priceIn adition upgrade quality

Help you

1

1

2

2

*Question : why did they help?

Hydro-forming

http://www.hysco.com/html/rd/ulsan/geabal_1_01.aspx

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

Summary Low wehigt car is very dengerous?

Eco-friendly?