VSE knjižnice (vzajemna bibliografsko-kataložna baza podatkov COBIB.SI)
  • Sound signals phenomena at a boundary layer during steel quenching [Elektronski vir]
    Ravnik, Franc ; Grum, Janez, 1946-
    In the production of machine components a manufacturing process often ends with heat treatment such as quenching by tempering. Generation of internal stresses during heat treatment and residual ... stresses present thereafter frequently result in non-uniform hardness and depth of a quenched layer, whichproduces distortion of a machine component and generation of residual stresses. The choice of optimum parameters of a quenching process and monitoring of the process itself ensures the achievement of the specified hardness and residual stress at the surface of the machine component. A purpose of controlling the quenching process is to ensure a required hardness on its surface layer. A hardening process can be controlled by selecting different quenching parameters, (quenching media, its temperature, temperatureof the specimen, .). In order to control the hardening process, oneshould be able to monitor the quenching process in real time. The paper treats an experimental setup comprising detection of sound emission together with some results in the course of quenching. Due to heat transfer from a specimen to a quenching medium, film boiling and nucleate boiling occur round a heated object, which strongly affects quenching. Sound-pressure signals demonstrated by different amplitudes depending on time at different frequencies are shown in 3D diagrams. It has turned out that an analysis of sound emission signals can provide useful information that confirms differences occurring in quenching with different quenching media and under different quenching conditions. Analyses of sound emission demonstrated, that sound emission during quenching process can be used for monitoring the hardening process. Analysis of the quenching results and sound emission signals during the process itself confirm the applicability of the new approach to the controlling of steel quenching.
    Vir: Gépész, mechatronikai és biztonságtechnikai szimpózium [Elektronski vir] : a Magyar tudomány ünnepe tiszteletére, 2008. november 14., Budapest (14 str.)
    Vrsta gradiva - prispevek na konferenci
    Leto - 2008
    Jezik - angleški
    COBISS.SI-ID - 10882331

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