Body-in-white, also called as body shell, refers to body structural parts and covering parts, including roof cover, wheel fender, engine cover, trunk lid and car door. However, it does not contain accessories and body whose decoration parts are not yet painted.
Stamping every part is the first step for manufacturing body-in-white. Taking car door as example, the followings are the steps of processing:
Cut the raw materials into sheets as required sizes of processing.
Send the cut sheets to stamping machine and fix them at assigned positions.
Stamping mould is under materials. Upper pressing machine applies upward pressure, making metal sheets fit the mould and forming the required shapes. Finally, the pressing machine leaves the surface of materials. Shift out the mould and send the formed materials the next step.
Inner plate of car door generally is classified into two parts. Two parts connect together through welding. Stamping parts are welded, consisting of body-in-white.
Stamping is a kind of metal processing methods, using various moulds which combine with cutting, bending, forming, extension and other processing forms, making out parts having different dimensions and structures. Both instrument parts and beam are stamped. Moreover, controlling dimensions and roughness of moulds can process precise or complicated parts.
Main advantages of stamping:
1. Parts have even thickness, light weight and high strength.
2. Pipeline operation is convenient and fast, having high rhythm of production, suitable for mass production.
3. It can process pieces having ribs, stiffeners or turnups which cannot be processed by other techniques.
4. Having high production efficiency and materials utilization, good shearing property and recycling property.