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EN
The impact of casting conditions on microstructure a and mechanical properties was described, especially for cast products from AlSi9Cu3 alloy. Particular attention was paid to the parameters of dendritic structure: DAS 1 and DAS 2. Selected mechanical properties (by static tension test) of test castings made using basic technologies of casting: GSC - gravity sand casting, GDC - gravity die-casting and HPDC - high-pressure die-casting, are presented for cast-on test bars and cast separately. Casts were made of the same alloy AlSi9Cu3. Fractures and the zone near the fracture (after static tension test) was subjected to VT - visual tests, PT - penetration tests and metallographic tests. The condition of porosity (fracture zone) was also assessed. The analysis of virtual results was performed using the NovaFlow & Solid system together with the database and they were compared to experimental tests. This way of validation was applied in order to assess the correlation between the local rate of cooling and the size of DAS for GSC, GDC and HPDC technologies. Finally, the correlation between the parameters of structure and mechanical properties with regard to the impact of porosity was signalized.
PL
Stop dentystyczny Remanium G na bazie NiCrMo przetapiano a następnie odlewano na drodze czterech najbardziej rozpowszechnionych technologii stosowanych w laboratoriach dentystycznych, a mianowicie przy zastosowaniu: (A) płomienia palnika tlenowo-acetylenowego jako źródła ciepła w procesach topienia, (B) pieca indukcyjnego, (C) łuku Volty oraz (D) metody Autocast. Głównym celem niniejszej pracy było dokonanie oceny wpływu w/w technik przetapiania i odlewania komercyjnego stopu Remanium G na bazie NiCr-Mo na odporność korozyjną w roztworze Ringera (pH = 6). Oceny odporności korozyjnej dokonano metodami polaryzacji potencjokinetycznej oraz analizy metalograficznej. Przeprowadzone pomiary wykazały, że zastosowane techniki przetapiania/odlewania mają nieznaczny wpływ na odporność korozyjną badanego stopu dentystycznego. Zaobserwowano, że w strukturze stopu Ni-Cr-Mo dendryty zbudowane są głównie z fazy międzymetalicznej γ (fcc) wzbogaconej w nikiel. Zwiększona zawartość molibdenu w składzie stopu powoduje jego silną segregację, i co za tym idzie wzbogacenie obszarów międzydendrytycznych w Mo.
EN
The prosthetic dentistry casting alloy Remanium G based on Ni-Cr-Mo was melted and casted by the four most widespread technologies in dental laboratories: (A) the flame of the oxy-acetylene blowpipe torch as a heat source in a melting process, (B) induction furnace, (C) Volta arc and (D) Autocast method. The main objective of this study was to assess the impact of the most commonly used techniques of melting and casting on corrosion resistance of commercial Remanium G alloy based on NiCrMo in Ringer solution (pH = 6). The evaluation of corrosion resistance of the dental alloy has been carried out by potentiokinetic polarization tests and metallographic analysis. The analysis showed that the type of melting and casting technologies has rather negligible effect on the corrosion resistance of the tested alloy. It was observed that the structure of Ni-Cr-Mo dendrites are composed predominantly of γ intermetallic phase ( fcc ) enriched in nickel. Increased molybdenum content in the alloy composition makes it a strong segregation , and hence enrichment in Mo interdendritic areas.
PL
W pracy rozważany jest problem poszukiwania informacji o charakterze technologicznym z sieci Internet. Przedstawiono wyniki wstępnych eksperymentów dotyczących eksploracji wiedzy o technologiach odlewniczych ze stron WWW. Zaprezentowano również schemat funkcjonalny oraz niektóre procedury obliczeniowe, komputerowego systemu do automatycznego tworzenia problemowo zorientowanych komponentów wiedzy technologicznej.
EN
The paper considers problems related with searching for technological information in Internet. The results of initial experiments in data mining about casting technologies from WWW pages are presented. A functional diagram and some numerical procedures (algorithms) of computer system for automatic creation of problem-oriented components of the technological knowledge are included.
EN
In paper it is presented thin wall ductile iron casting (TWDI) as a substitute of aluminium alloy casting. Upper control arm made of ductile iron with wall thickness ranging from 2 - 3.7 mm was produced by inmold process. Structure, mechanical properties and computer simulations were investigated. Structural analysis of TWDI shows pearlitic-ferritic matrix free from chills and porosity. Mechanical testing disclose superior ultimate tensile strength (Rm), yield strength (Rp0,2) and slightly lower elongation (E) of TWDI in comparison with forged control arm made of aluminium alloy (6061-T6). Moreover results of computer simulation of static loading for tested control arms are presented. Analysis show that the light-weight ductile iron casting can be loaded to similar working conditions as the forged Al alloy without any potential failures.
5
Content available remote Selection of material for cores hardened with carbon dioxide
EN
The work presents the investigation results concerning the bending and the tensile strength of specimens made of various types of core sands. The investigated core sands for bending tests have been prepared of silica sand from Nowogród Dobrzański and, alternatively, of H33 German sand, both containing a variety of binders, namely Carbophen 5692, Carbophen 7170, Carbophen 8178, Novatec 1000, or SuperEko 2000 phenolic resins, as well as water glass. The tensile strength has been investigated for specimens made of silica sand from Nowogród Dobrzański and the sand supplied by Hüttenes-Albertus Polska, both types bond with Carbophen 5692, Novatec 1000, or SuperEko 2000 resins. All specimens have been tested immediately after the CO2 hardening process, then after 1 hour and after 24 hours. It has been found that the type of sand grains significantly affects both the bending and the tensile strength. Furthermore, for each type of sand the best bending strength has been achieved for Carbophen 7170, Carbophen 8178, and Novatec 1000 resins, whereas the best tensile strength has been offered by specimens bond with Carbophen 5692 resin.
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