A two-color pyrometer has been developed to measure the temperature of surfaces with unknown emissivities during high speed turning processes. Quartz fibers enable measurements at locations with limited optical access. The sensitivity of the pyrometer has to be high enough to measure temperatures down to 300 °C of an aluminum alloy with an emissivity as low as 0.2. The accuracy of the two-color pyrometer has been compared with the accuracy of monochromatic pyrometers for different metallic surfaces. The different arguments for the choice of the two pyrometer wavelengths 1.7 and 2.0 μm are explained. The influences of the surface emissivities, the digitization, and the noise on the absolute and relative measurement error have been determined. Fast amplifiers and data acquisition allow a maximum time resolution of a few microseconds and a local resolution of ∼0.5 mm2. Some test measurements of an aluminum alloy surface are presented.
The purpose of this paper is to show the innovative approach of manufacturing filigree and highly complex components by means of laser beam melting. Design/methodology/approach. The paper describes the unique geometric freedom of the laser beam melting technology and its possibility of quick, tool-less production of complex components allow the manufacturing of functionally superior components in a short time. Principally concludes the following: additive manufacturing proved to give superior properties to the component compared to conventional manufacturing methods. Originality/value. This study provides context for the development and manufacturing of an individual heat-transfer component for an electricdriven formula race car
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