The dimensional variation of hole location in door panels have been reduced with laser welding of blanks from +/- 0. 5to +/-0. Sot welding or seam welding may be used but for a tailored blank, te laser welding blanks are used since they provide three advantages including; Hwever, tere is a greater demand of strict control of the butt-joint pressure, te edge quality, ad other parameters of laser welding that includes; wlding speed, pwer, bam alignment, asist gas flow, ad depth of focus. Aform of resistance welding where a slight overlap of blank segments is referred to as mash seam welding.
Tis is driven between two electrode wheels while under pressure and the welding is done by aid of electric current. Tis described method is another way of preparing a tailored blank. Te plannishing wheels usually come after the electrodes t cold work the welded joints to below 10% over the initial thickness since the overlapping blank segments may end up varying in thickness. Te longish panels require mash seam. Fr instance; te L-section members that comprise chassis rails are constructed from mash seam at Volkswagen.
Tree pieces of different thickness occur for the blank of one member, wile the blank of the other members four. This particular process upgraded crash rating and was deserving of reduction in insurance premium. Te deep drawn panels apply double action press as the initial operation in a line. Tere exist two slides inclusive of; te inner punch and the outer for blank holder by ensuring accurate pressing by moving along the panels installed on uprights. Btter productivity is by quick approach – quick return motion curve of the outer slide.
Te blank is clamped by the blank holder between the hold down unit and the draw ring and this becomes decisive for the draw’s quality. Winkles will develop in the flange of the drawn parts of the blank in case the hold down force is too low. O the other hand, i the hold down force is excessive, tere is less sufficient yield of the metal according to the tears and frictional force. Te material’s local is dependent the optimum hold down force and the various draw conditions in different portion of a complicated panel result in variations in the hold-down pressure along the part’s contour.
Te variation between the least and the greatest permissible. ..
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