Abstract
Abstract. A new induction-heated fixed-point device was developed for calibration of temperature measurement devices typically used in laser heat treatment for the temperature range 1000–1500 °C. To define the requirements for the calibration method, selected measurement setups were compared as well as process data and results of industrial processes were analyzed. Computer simulation with finite element method (FEM) and finite difference method (FDM) was used to optimize the system components and processing parameters of the induction heating of fixed-point cells. The prototype of the fixed-point device was tested successfully, and the first measuring results are presented here. The new calibration method is expected to improve the quality and reproducibility of industrial heat treatment processes with temperature control.
Highlights
The technology of laser surface heat treatment for steel or cast iron parts with high-power diode lasers was developed in the late 1990s and has been established in industrial mass production for more than 10 yr
The fixed-point cells for the high temperature range above 1000 ◦C are typically heated by a Joule-heated graphite fur
A radial symmetrical finite difference method (FDM) model was developed to investigate the influence of the distribution of the induction heat nace (Friedrich and Fischer, 2000)
Summary
The technology of laser surface heat treatment for steel or cast iron parts with high-power diode lasers was developed in the late 1990s and has been established in industrial mass production for more than 10 yr (see, e.g., Bonss et al, 2003, 2005, 2009). Different variants of temperature measurement configurations, typically used in industrial laser heat treatment, were investigated to define the requirements for the device. Accuracy and reproducibility of temperature measurement devices that are electrically, optically and memeasurement in laser heat treatment down to 5 K as well as chanically fully integrated into complex machines at indusa calibration method with an uncertainty significantly lower trial sites, on-site calibration and inspection with a mobile are required.
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