Wyniki 1-4 spośród 4 dla zapytania: authorDesc:"MÁRIA KAPUSTOVÁ"

the analysis of closed-die forging process with the help of computer simulation

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The paper is focused on analysis of materials behaviour at die filling during closed die forging. The analysis was done for forging of part for transmission gear with simulation software SuperForge. The analysis enabled to optimize forging process especially from the point of view of elimination of the flash creation. The analysis allowed the verification of forging tools design for production o[...]

Verification of bulk metal forming numerical model

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Numerical models of metal forming based on finite elements method can lead to excellent results, but it is necessary to verify them by experimental results. The simple way as to verify numerical result is to compare them with experimental result. Bulk forming leads to grain boundaries deformation. The value of strain is very simple to obtain by stereology, more precisely - by measurement of grai[...]

The Research of Forgeability of Magnesium Alloy at Warm Forming Temperatures DOI:10.15199/24.2016.9.8

  Badania podatności do kucia stopów magnezu w podwyższonych temperaturach The presented contribution is aimed at research of temperature influence on workability of a selected magnesium alloy at temperature interval for warm forming. The magnesium alloy type AZ31 was selected for experimental purposes. The mentioned alloy is used for production of drop forgings. In order to consider forgeability, Židek´s pressure test at warm conditions was selected and used as technological test. The author of mentioned test recommends cylinder shaped test sample with four notches. For magnesium alloy AZ31 hot forming at temperature interval from 250°C to 425°C is recommended. The pressure tests were conducted within the temperature interval of 200-350°C, i. e. at temperatures belonging to lower limit of recommended temperature interval, in order to acquire as much information as possible on behaviour, plasticity and formability of magnesium alloy at lower forming temperatures. Zakres niniejszej pracy dotyczy wpływu temperatury na kowalność stopów magnezu. Wybrany do badań Stop AZ31 jest kształtowany w procesach kucia, czego efektem jest wytwarzanie odkuwek o zróżnicowanych kształtach. Biorąc pod uwagę kowalność do badań, wybrano metodę testu ciśnieniowego w podwyższonej temperaturze. Autorzy tej metody zalecają badania próbek w kształcie walca z czterema karbami. Dla badanego stopu zaleca się temperaturę obróbki plastycznej w przedziale 250°C do 425°C. Test ciśnieniowy przeprowadzono w zakresie temperatury od 200-350 °C, ze względu na analizę zachowania się stopu podczas kształtowania w temperaturze z dolnego zalecanego zakresu przeróbki plastycznej. Key words: warm forming, forgeability, test pressure, magnesium alloy, appearance of cracks in notches Słowa kluczowe: kształtowanie w podwyższonej temperaturze, podatność do kucia, test ciśnieniowy, stopy magnezu, pękanie w karbie Introduction. Drop forgings made of nonferrous metals have been increasingly app[...]

The Influence of Temperature and Strain Rate on Flow Stress of Steel 10CrMo9-10 used for Drawing of Tubes DOI:10.15199/24.2017.8.20

  Introduction. The flow stress curves built by the tensile or pressure tests are important for accurate calculation of forming pressures, forming forces and deformation work in individual moulding operations. The calculated techno lection of suitable forming machines as well as the proper dimensioning of the forming tools. The flow stress curves of the refractory materials su itable for seamless tubes are important for the preparatory phase of computer simulation of the cold drawing process. Correctly selected input parameters of the cold drawing of pipes affect the accuracy of the computer simulation results. It is therefore necessary to constantly complement the si mulation software database of materials with the flow stress curves of the materials used for the production of seamless tubes. Determination of the courses of flow stress curves also allows defining the limit strain by using the Ludwik -Holomon equation [1-4]. Examined material description. Creep-resistant 15 313 steel (10CrMo9-10, W. Nr. 1.7380) is a low-alloy steel cha racterized by both good hot forming and workability. The steel is designed for elevated temperatures at simultaneous higher pressures. It exhibits resis[...]

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