EXPERIMENTAL AND NUMERICAL STUDY OF THE BENDING PROCESS OF TAILOR-WELDED BLANKS
Bishoy Michael Rizk Dawood A Thesis Submitted to the Faculty of Engineering at Cairo University in Partial Fulfillment of the Requirements for the Degree of MASTER OF SCIENCE in Mechanical Design;
Abstract
A tailor-welded blank (TWB) is comprised of two or more separate pieces of sheet metal welded together prior to stamping. TWBs allow the welding of materials with different grades, thickness or corrosion coatings together to achieve desired properties in different areas. However, several process defects appear during the forming of TWBs such as springback, reduced formability due to welding, and weld-line movement (WLM). The present work studies the effect of different process parameters on springback and WLM through an integrated experimental and numerical analysis of U-bending process of the TWB. The analysis of draw-bending process shows that, under constant BHF schemes, weld-line moves under all BHF levels considered. WLM occurs at the early stage of punch travel. This problem has been successfully solved via the use of variable blank holding force (VBHF) schemes that eliminates WLM.
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| Title | EXPERIMENTAL AND NUMERICAL STUDY OF THE BENDING PROCESS OF TAILOR-WELDED BLANKS | Other Titles | دراسة معملية وعددية لعملية ثنى لالواح مصممة ملحومة | Authors | Bishoy Michael Rizk Dawood A Thesis Submitted to the Faculty of Engineering at Cairo University in Partial Fulfillment of the Requirements for the Degree of MASTER OF SCIENCE in Mechanical Design | Issue Date | 2014 |
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