DUAL-TEN^® Brochure - Springback

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Due to the high-strength nature of DUAL-TEN^® steel, springback is taken into consideration at product and process design stages.

Figure 7: Springback Angle Measures from an Automotive Rail Stamped on Tools Designed for HSLA [2]

Figure 7 shows the springback angle measures from an automotive rail. DT1, DT2, DT3 and DT4 DUAL-TEN^® steels with minimum tensile strength of 590 MPa are compared with HSLA 340.  This analysis shows that DUAL-TEN^® steel has a higher springback angle than HSLA.  However, springback can be controlled by modified part and die designs. DUAL-TEN^® steel is more formable than conventional high-strength steel (as shown in Figure 4) and offers flexibility in part and die designs to control springback.  Figure 8 illustrates the effect of die radius and restraint force on sidewall curl and springback angle, measured from a strip drawn over a die radius.  By using an appropriate die radius and restraint force, springback of DUAL-TEN^® steel can be controlled.  Preliminary data also show that DUAL-TEN^® steel has less springback variation than conventional HSLA.

Figure 8: Effects of Die Radius (R/t) and Restraint Force (RF) on Springback [8]

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