Exact temperature measurement during hot stamping

Temperature control: hot blank inserted manually into the hot stamping tool. (Source: IFUM)

IFUM/IMPT | Precise temperature control is a decisive factor during hot stamping: Only if the component part is cooled down fast enough, it is hardened sufficiently. For direct temperature measurement in the tool, researchers at IFUM and IMPT developed a thin-film sensor.

In automotive lightweight construction, hot stamping is a well-established method to produce high-strength safety-relevant component parts. Sheet steel is heated to 930°C forming temperature. The forming tool remains closed for some seconds to cool the component part down as fast as possible to approximately 150°C, thus increasing the strength considerably.

For temperature control, researchers of the Institute of Forming Technology and Machines (IFUM) and the Institute of Micro Production Technology (IMPT) developed sensor prototypes. Based on the thermoelectric and thermoresistant effect, they produced thin-film sensors in the range of fifty nanometres. At the same time, the researchers developed a concept for integrating the sensors into a forming tool.

In comparative measurements, the sensors proved high accuracy. They help manufacturers to improve the quality of hot-stamped parts and optimize the time when to withdraw the part from the tool, thus making the whole production process more efficient.

by Chris Pfeffer

Image gallery for this article

  • Temperature control: hot blank inserted manually into the hot stamping tool. (Source: IFUM)
  • SEM micrograph: The sensor film is just about fifty nanometres and wear-protected by a ceramic coating. (Source: IMPT)
  • Precise measurement: prototype of the thermoresistant sensor compared to a pyrometer and a sheath thermocouple. (Source: IFUM)
This website uses cookies to provide you with the best possible functionality. You agree to the use of cookies by using our website without changing your preferences. (Data Protection)