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12. December 2019

Improved joining of hot-stamped parts

IFUM | New options for conventional hot stamping: Researchers at IFUM intend to improve the joinability of hot-stamped car body parts in multi-sheet joints. This is achieved by local thinning and softening of the austenitised material.

Hot-stamped structural parts are a key factor in automotive lightweight design, where 22MnB5 steel has become an established material in the production of safety-relevant car body parts. An improved reliability of joining technology would even widen the range of application of hot-stamped parts.
Up to now, ultra-high-performance car body parts are thermally joined to other parts by spot welding. Problems arise from uneven weld lense formation with improper bonding in multi-sheet joints. The applicability of mechanical joining processes like riveting is also limited due to the high strength and hardness of the hot-stamped parts.
Researchers of the Institute of Forming Technology and Machines (IFUM) intend to improve the joinability of hot-stamped parts by local thinning and softening of the austenitised material. The result: improved thermal as well as mechanical joining techniques.

by Eugen Stockburger

Similar posts

  • Exact temperature measurement during hot stamping
  • Lightweight design: thermomechanical precision forging
  • Hot stamping: Testing method detects part failures

Benefits derived from research results

  • Selective thinning and softening in car body parts
  • New options for conventional hot stamping process
  • Enhanced process window and improved joining processes
  • Increased efficiency and saving of energy
IFUM_Presshaerten_Bild1_02
Eugen Stockburger carries out a test at the Institute of Forming Technology and Machines. (Source: IFUM)
IFUM_Presshaerten_Bild2_02
Improved joining of hot-stamped steels (top sheet in green) in multi-sheet joints. (Source: IFUM)
IFUM_Presshaerten_Bild3-EN
Measured hardness and micrographs of locally thinned and softened blank. (Source: IFUM)
IFUM_Presshaerten_Bild4-EN
Numerical analysis for enhanced hot stamping by local thinning and softening. (Source: IFUM)
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Eugen Stockburger, M. Sc.

+49 (0)511 762-3913

stockburger@ifum.uni-hannover.de

www.ifum.uni-hannover.de

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Similar posts

  • Exact temperature measurement during hot stamping
  • Lightweight design: thermomechanical precision forging
  • Hot stamping: Testing method detects part failures

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