TAILIEUCHUNG - Cảm biến trong sản xuất P16

After mechanical manufacturing, heat treatment is mainly applied in one of the final steps of production, to adjust the workpiece properties to the later mechanical, tribological, and corrosive load. The lifetime of these components is defined through the raw material used, the construction geometries, and the quality of heat treatment. The great demands for quality control and the documentation of process parameters have led to the increasing importance of sensor applications in heat treatment. | Sensors in Manufacturing. Edited by H. K. Tonshoff I. Inasaki 326 I 4 Sensors for Process Monitoring Copyright 2001 Wiley-VCH Verlag GmbH ISBNs 3-527-29558-5 Hardcover 3-527-60002-7 Electronic Heat Treatment P. Mayr H. Klümper-Westkamp Stiftung Institut für Werkstoftechnik IWT Bremen Germany Introduction After mechanical manufacturing heat treatment is mainly applied in one of the final steps of production to adjust the workpiece properties to the later mechanical tribological and corrosive load. The lifetime of these components is defined through the raw material used the construction geometries and the quality of heat treatment. The great demands for quality control and the documentation of process parameters have led to the increasing importance of sensor applications in heat treatment. Furthermore increasing automation combined with the idea of integrating the heat treatment into the production line needs many different sensors to make the whole process as reliable as possible. Temperature Monitoring The primary process variable to be measured and controlled in heat treatment is the temperature which directly influences component properties. There are a very large number of different temperature-dependent physical properties that can serve at least in principle as the basis for thermal sensors. Only a few of them are used in heat treatment plants to measure the temperature. Thermocouples are the most commonly used temperature sensors in heat treatment. They consist of two conductors of different metallurgical composition which are made up into an electrical circuit with two junctions. If the two junctions are brought to a different temperature a thermoelectric potential is created. The magnitude depends on the composition of the conductors chosen and the temperature difference 1 . Their simple construction allows sensors to be made which are able to provide reliable and accurate data under extreme measurement conditions. With thermocouples a .

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