A so-called tailored blank method is being used regularly for automotive bodies in recent years.
In the tailored blank method, different types of steel plates are joined together enabling local changes to properties within a single sheet of material.
As shown below, this is a tailored press material prepared through welding several steel plates in line with specific purposes.
Different types of steel plates are joined together to enable local changes to properties within a single sheet of material. Because of these characteristics, this has claimed the limelight as a material for automotive chassis.
Automobile body requirements include reinforcement, durability, rust inhibition, absorption of crash energy, and weight reduction all at the same time and on top of this efficient three dimensional curved surface design is demanded so the panel thickness and material have to be changed meticulously for each of the body panels. On the other hand, from the perspective of body precision and manufacturing performance, reduction in the number of parts to the greatest extent possible is preferable so the need to reduce the number of panels has continually been strong. The primary reasons that tailored blank method is used in the automotive body industry are the reasons described above.
Tailored blank characteristics
1) Optimum configuration of panel thickness and material.
2) Continuous line welding so joint strength is high.
3) Very little overlap material required for spot welding.
4) High degree of freedom in material shape.