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2 Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

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Optimal cooling of a shaped roll

Petruska J., Horsky J., Vavrecka L.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

2006

z. 31

127-130

Design of optimal configuration of cooling nozzles of a grooved roli for U-profile rolling is presented in the paper. Prolongation of the roli life is the aim of the work, which should be reached by elimination of extreme values of thermal stress, causing initiation and growth of fatigue cracks. The task was solved as a sequence of several types of coupled computational problems together with a number of simplifying presumptions, which enabled an efficient analysis of the complex problem. The results enabled a rational assessment and selection of such nozzle configuration that seems to be the best one for the profile roli cooling.

Constitutive behaviour of steel in mushy state

Petruska J., Ridky R., Horsky J., Kotrbacek P.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

2004

z. 25

121-124

Semi-solid or mushy state processing permits a material to partially solidify before shape making operations. The understanding of material behaviour in the mushy state is critical for better control of various semi-solid processes. The aim of the present study is to experimentally quantify the deformation behaviour of carbon steel in mushy states. Semi-solid specimens under upsetting deformation were evaluated at various forming rates. The temperature of specimens was carefully controlled to keep the solid fraction constant. Based on the experiments, material parameters of the Perzyna's constitutive model are identified. Good correlation between simulated and measured results of the compression force was observed.