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Blanking immediately after heating and ultrasonic cleaning for compact hot-stamping systems using rapid resistance heating

  • Tomoyoshi MaenoEmail author
  • Ken-ichiro Mori
  • Tomoki Ogihara
  • Tomohiro Fujita
ORIGINAL ARTICLE

Abstract

To produce ultra-high-strength steel parts for improving fuel consumption and collision safety of automobiles, a compact hot-stamping process having resistance heating was developed. In this process, a blanking operation was introduced immediately after heating to deal with non-rectangular blanks in resistance heating. By blanking, not only were the blank shapes optimised for stamping but the formability was also improved by removing both non-heating edges in contact with the electrode. A rectangular quenchable steel sheet was resistance-heated; the sheet was immediately blanked into the desired shape, and the blank was hot-stamped. In addition, reinforcements used for a body-in-white were hot-stamped using the proposed process to examine the applicability. The reduction in thickness of the hot-stamped reinforcement using a hot-blanked sheet was reduced compared with that using a rectangular blank. The formability was improved by blanking immediately after heating. Moreover, ultrasonic cleaning with diluted hydrochloric acid removed the thin oxide scale caused by resistance heating, and the spot-resistance weldability and electrodeposition paintability were improved. Blanking immediately after heating and ultrasonic cleaning are useful for practical hot-stamping processes using resistance heating.

Keywords

Hot stamping Resistance heating Ultrasonic cleaning Blanking 

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Notes

Acknowledgements

This work was supported in part by the Amada Foundation’s Grant-supported Researches (AF-2015001).

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Copyright information

© Springer-Verlag London Ltd., part of Springer Nature 2018

Authors and Affiliations

  1. 1.Division of Systems Research, Faculty of EngineeringYokohama National UniversityYokohamaJapan
  2. 2.Department of Mechanical EngineeringToyohashi University of TechnologyToyohashiJapan
  3. 3.Bellsonica CorpKosaiJapan

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