Part temperature measurement inside forming tools

This invention for the first time allows for precise temperature monitoring of components during hot forming, semi-hot forming and related processes like press hardening or hydroforming. Utilizing the thermoelectric Seebeck coefficient it offers dynamic temperature data for the entire workpiece fully enclosed by the mold - ideal for process analysis and monitoring.

Common temperature measurement methods, such as contact or radiation thermometers, are often inaccurate or not applicable. Typically, contact thermometers embedded in the mold lack sufficient dynamics and accuracy. Radiation thermometers, are generally unsuitable for temperature determination during the manufacturing process of workpieces completely enclosed by the mold.

This invention, based on the thermoelectric effect, was developed by a research team at the Technical University in Munich. It enables highly accurate and highly dynamic workpiece temperature determination. Instead of determining the temperature indirectly, for example via a separate thermocouple, the tool itself becomes the thermocouple. Two tool parts in direct contact with the workpiece each composed of materials with distinct Seebeck coefficients are used as the segments of a thermocouple. The thermoelectric voltage that results correlates with the temperature of the workpiece.

• Improves component quality
• Simplifies process optimization and process control
• Compatible with standard presses
• Simple retrofitting

TRL 6: Technology demonstrated in relevant environment