Mechanism of Springback-Free Bending of High-Strength Steel Sheets under Warm Forming Conditions

Jun 30th, 2015
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Automobiles require lightweight construction [1] to reduce the amount of emission, and thus, the use of metallic materials with a high strength per weight, such as highstrength steels, for automobile body parts is increasing rapidly in sheet-forming industries. The large amount of springback after sheet forming of high-strength steels is one of the major problems. Generally, sheet metal forming at elevated temperatures.

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Mechanism of Springback-Free Bending of High-Strength Steel Sheets under WarmForming Conditions1J. Yanagimoto (2)1, K. Oyamada1Institute of Industrial Science, The University of Tokyo, Tokyo, JapanAbstractTensile loading-unloading tests of high-strength steel sheets in an elevated temperature range are conductedusing a 100kN servo-controlled hydraulic dynamic fatigue testing machine, aiming at clarifying the mechanismof the springback-free phenomenon occurring in warm sheet forming. From stress-strain curves obtained bythe tests, it is found that the abrupt decrease in the springback of formed steel sheets at approximately 750Kin isothermal v-bending tests is mainly caused by high-temperature transient creep deformation. Also, fromthe results obtained by the isothermal v-bending test, bending-unbending deformation observed attemperatures higher than 750K, as a result of high-temperature creep, was found to have a secondary effectin the springback-free phenomenon.Keywords:Sheet metal, Springback, Warm sheet formingAnnals of the CIRP Vol. 56/1/2007Amount of springback (deg.)1 INTRODUCTIONAutomobiles require lightweight construction [1] to reducethe amount of

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