In this study, a V-bending experiment was performed using various types of sheet metal for automobile use from mild steel to ultrahigh-strength steel and observed the sheet shaping process in detail. It was shown that the target bent angle (90 deg of angle in this study) could be obtained at a stage prior to pressure bending. A detailed study of this point revealed the following results indicating that the bending accuracy of high-strength steel can be improved and that the bending load can be reduced. (1) In the bending of sheet metals, the target bent angle can be achieved at a low work load without pressure bending by controlling the amount of indentation. (2) The overbending phenomenon caused by material deformation results in steel-sheet bending beyond the target bent angle, but springback after unloading results in a return to the target angle in a region of small punch indentation and low working load. (3) The amount of indentation for achieving the target bent angle can be computed by FEM simulation using the characteristics of the test materials. (4) The bending-shaping method considered in this study reduces the press work load and realizes a small radius of curvature in high-strength steel.
Reducing work load and increasing dimensional accuracy in parts for bending of high-strength steel sheets for automobiles
Materials Transactions ; 52 , 3 ; 452-457
2011
6 Seiten, 15 Bilder, 1 Tabelle, 15 Quellen
Aufsatz (Zeitschrift)
Englisch
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