Page 6 - Motor Fan illustrated Special Edition
P. 6

                   01       Aluminum alloy sheet
                             Aluminum alloys used in automobiles : 1

                            Aluminum alloy sheet features superior formability and strength

                     6000 series aluminum alloy sheet for body panels

                Producing body panels from aluminum alloy sheet is a highly effective   Change in proof stress from during forming
                way to reduce weight and enhance fuel efficiency.                 to after coating
                Currently, 6000 series aluminum alloy sheets are the type most commonly   6000 series sheets are strengthened more
                used in body panels, and since they have “bake-hardenability,” they can   than 5000 series sheets.
                be strengthened during the coat baking process.
                The 6000 series aluminum alloy sheets are characterized by low strength            When shipped
                during the molding process, making them highly workable, but the coat              After 2% pre-straining
                baking process makes them substantially stronger.                                  After 2% pre-straining
                                                                                                   20 min. at170°C

                                                                                   Proof stress

            Motor Fan illustrated
                             properties of   Hemmability                                6000 series  5000 series  5000 series  5000 series
                             automobile     Dent resistance
                             body sheet                                               Change in proof stress of body sheets
                                            Corrosion resistance
                                            High-luster paint finish
                                                                                                      Ordinary body sheet

                Bonnet of Toyota Prius

                Both the interior and exterior structures are made from 6000 series
                aluminum alloy sheet.                                                                 High-hemmability sheet

                                                                         Since aluminum alloy sheet is less elongate than steel sheet,
                                                                         it cracks easily during hemming. This means that flat hemming involving
                                                                         bending by 180 degrees has previously been difficult to achieve. However,
                                                                         UACJ Corporation has created an aluminum alloy sheet that can be
                                                                         subjected to Sharp Hemming, a process that is even more problematic than
                                                                         flat hemming.

                     5000 series aluminum alloy sheets for body panels

                5000 series aluminum alloy sheets are the strongest of the
                non-heat-treatable alloys and also have excellent press formability.
                Through finding the right amount of magnesium to add, and through
                nanostructure design control, UACJ Corporation has created
                aluminum alloy sheet that has formability similar to that of steel sheet.
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