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| Kvačkaj T., Sokolová L., Vlado M., Mišičko R., Vrchovinský V., Nový Z. |
| PULSATORY FORMING – NEW METHOD OF BULK HOT PLASTIC DEFORMATIONS |
Abstract
Pulsatory forming of metal materials (stresscycling), as one of non – conventional bulk forming methods, can be classified as the category of technological processes where the energy of vibration systems with a frequency effect is utilized. The pulsation frequency and amplitudes during pulsatory forming are new technological parameters using which we can influence both important processes taking place in the formed metal (recrystallization, grain growth, transformation processes) and the contact area between the formed metal and the forming tool (the character of friction and related impacts on the deformation course and the formability). This paper presents the first results of pulsatory forming realized by pulsator at Department of Metal Forming, Metallurgical Faculty, Technical University in Košice. The basic mechanical characteristics and also geometrical and microstructural parameters after pulsatory forming for steel grade Cr18Ni10 were analyzed. The best mechanical properties (yield strength, tensile strength) and plastic properties (elongation, contraction) were achieved by pulsation frequency from 20 – 35 Hz. Highest hot plastic deformations were obtained with pulsation frequency 30 – 35 Hz. The most fine austenitic grain sizes were made with pulsation frequency from 25 – 35 Hz.
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| Keywords: pulsator|pulsation forming|pulsation frequency|microstructure|geometrical characteristics|mechanical properties|plastic properties|formability| |
| No 4 (2003), p. 285-291 |
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| Khouri S, Horodníková J., Domaracká L., Bohušová V. |
| MANAGEMENT INFORMATION SYSTEMS |
| Keywords: management information systems|exploited enterprises|financial management| |
| No 4 (2003), p. 292-297 |
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