Journal
CIRP ANNALS-MANUFACTURING TECHNOLOGY
Volume 54, Issue 1, Pages 209-212Publisher
TECHNISCHE RUNDSCHAU EDITION COLIBRI LTD
DOI: 10.1016/S0007-8506(07)60085-7
Keywords
warm and hot forming; sheet metal; ultra high tensile strength steel
Ask authors/readers for more resources
A warm and hot stamping process of ultra high tensile strength steel sheets using resistance heating was developed to improve springback and formability. In this process, the decrease in temperature of the sheet before the forming is prevented by directly heating the sheets set into the dies by means of the electrical resistance, the so-called Joule heat. Since the heating time up to 800 degrees C is only 2 seconds, the resistance heating is rapid enough to synchronise with a press. The effects of the heating temperature on the springback and formability of ultra high tensile strength steel sheets were examined. The springback in hat-shaped bending of the high tensile strength steel sheets was eliminated by heating the sheet. In addition, the ultra sheet having a tensile strength of 980MPa was successfully drawn by the heating. The heating temperature is optimum around 600 degrees C due to the small springback and oxidation and the increase in hardness.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available