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Wyszukujesz frazę "roughness of surface" wg kryterium: Temat

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    Tytuł:
    Zmiany stanu powierzchni modeli drewnianych w procesie technologicznym wykonywania z zastosowaniem maszyn CNC
    Changes of the Wooden Patterns Surface in Technological Execution Process with Using CNC Machines
    Autorzy:
    Waksmundzki, M.
    Zych, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/381397.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    model drewniany
    chropowatość powierzchni
    maszyna CNC
    wooden pattern
    roughness of surface
    CNC machine
    Opis:
    W pracy przedstawiono wyniki badania stanu powierzchni modeli drewnianych wykonywanych przy użyciu frezarek CNC. Badaniami objęto drewno sosnowe i olchowe, które stanowią podstawowe gatunki wykorzystywane w modelarstwie odlewniczym. Powierzchnia uzyskiwana po obróbce charakteryzuje się stosunkowo dużą chropowatością, którą związana jest z szybkością posuwu, średnicą freza, kierunkiem ruchu narzędzia w stosunku do kierunku ułożenia słojów. Cechą powierzchni po obróbce jest jej falisty i powtarzalny profil przekroju. W badaniach wykazano, iż kolejne zabiegi technologiczne w obróbce modeli, szpachlowanie, szlifowanie i malowanie podwyższają gładkość powierzchni. Wykazano również, iż relacja: kierunek ruchu freza/kierunek ułożenia słojów odgrywa istotną rolę w kształtowaniu końcowej jakości powierzchni modeli. Ta tendencja jest wyraźniejsza w przypadku stosowania drewna sosnowego o silniej anizotropowej budowie.
    The work shows the results of a study of patterns surface roughness made of wood using CNC. The studies covered pine wood and alder wood, which constitute the principal species used in Foundry. The surface obtained after treatment is characterized by relatively large, some roughness which is linked to the rate of feed which is linked to the rate of feed. A feature of the surface after treatment is its sinuous and repeatable profile section. In studies it has been shown that the next technological treatments adapted in treatment patterns as filling, sanding and painting enhance the smoothness of the surface. It has been shown that the direction of movement relationship milling grain direction plays an important role in shaping the final surface quality patterns. This trend is more pronounced in the case of pine wood with stronger anisotropic grades.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 4 spec.; 139-142
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of influence of internal surface roughness of a fan rotor onto its performance parameters
    Autorzy:
    Fortuna, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/175530.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    centrifugal fans
    CFD simulation
    fan performance prediction
    surface roughness of rotor
    Opis:
    Computional fluid dynamics study and experimental test using the standard methods on flow characteristics of the centrifugal fan, have been presented in this paper. This investigation was performed to determine the influence of internal surface roughness of fan rotor onto its performance parameters. The testing results are presented in form of graphs showing the efficiency, pressure and power in function of flow.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2014, 126; 111-121
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Analysis of Molding and Modification of the Ceramic Surfaces and Its Impact on the Roughness of Castings
    Autorzy:
    Jesiotr, M.
    Myszka, D.
    Trzaskowski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/947458.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nickel coating
    roughness of casting surface
    aluminum alloys
    ceramic mold
    polymer materials
    powłoka niklowa
    chropowatość powierzchni
    stopy aluminium
    formy ceramiczne
    materiały polimerowe
    Opis:
    The article presents an analysis of changes in the outer surface of the casting made in a modified ceramic form. The introduction of the modification in the inner surface of the form, as a metallic coating was intended to produce a high quality of the casting surface. To describe the results, the three parameters have been chosen to characterize the surface roughness, i.e. Ra, Rz and Rq. In implementing the popular method of casting was used, so – called the lost polymer models. The models made from different plastic materials are chemically and electrochemically coated with a layer of nickel. The next step was to remove the model from the form and pouring the liquid metal over it. The observation of the casting surface was performed by using the scanning electron microscope and a profilometer. As a result of these attempts a number of castings have been obtained with an outside layer generated of lower roughness than the casting made in the normal gypsum form. The proposed method can be called an innovative one because it reduces the technological cycle by one processing operation of investment casting. During the process of casting both the cast and the outer layer improving the properties of the manufactured product is being produced.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 1 spec.; 47-50
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A surface engineering approach applicable to concrete repair engineering
    Autorzy:
    Garbacz, A.
    Courard, L.
    Bissonnette, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/202018.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    durability of concrete structure
    repair
    adhesion
    surface roughness
    microcracking
    surface engineering
    Opis:
    The objective of the paper is to analyze the effect of substrate roughness and superficial microcraking upon adhesion of repair systems using concrete surface engineering approach. The results presented in this paper have been obtained within the framework of research projects performed to develop a better understanding of the factors affecting the adhesion of repair materials through a surface engineering approach. Based on the results of investigations, the authors showed that the durability and quality of concrete repairs depend to a large degree on the characteristics of the substrate. Mechanical preparation and profiling of the concrete surface to be repaired has to be balanced with potential co-lateral effects such as superficial cracking, too often induced as a result of inappropriate concrete removal method selection, and the loss of benefits due to better mechanical anchorage. The results obtained confirm also that Concrete Surface Engineering, as a scientific concept, will definitely contribute to shed more light on how to optimize repair bond, taking into account interactions between the materials at different observation scales.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 1; 73-84
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimentation and Prediction of the Wear of a Cutting Tool in Turning Process
    Autorzy:
    Merzoug, M.
    Benamara, N.
    Boulenouar, A.
    Bouchouicha, B.
    Mazari, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/356451.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    turning
    cutting parameters
    tool wear
    surface roughness
    design of experiments
    Opis:
    In the present work, the performance of multilayer coated carbide tool was investigated considering the effect of cutting parameters during turning of 34CrMo4 Low alloy steel. It has high strength and creep strength, and good impact tenacity at low temperature. It can work at –110°C to 500°C. And EN 10083-1 34CrMo4 owns high static strength, impact tenacity, fatigue resistance, and hardenability; without overheating tendencies. The objective functions were selected in relation to the parameters of the cutting process: surface roughness criteria. The correlations between the cutting parameters and performance measures, like surface roughness, were established by multiple linear regression models. Highly significant parameters were determined by performing an Analysis of variance (ANOVA). During the experiments flank wear, cutting force and surface roughness value were measured throughout the tool life. The results have been compared with dry and wet-cooled turning. Analysis of variance factors of design and their interactions were studied for their significance. Finally, a model using multiple regression analysis between cutting speed, fee rate and depth of cut with the tool life was established.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 2; 563-573
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Vacuum Assistance on the Quality of Castings Produced by High Pressure Die Casting Method
    Autorzy:
    Łągiewka, M.
    Konopka, Z.
    Nadolski, M.
    Zyska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/380704.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative foundry technologies
    aluminium alloys
    quality of castings
    surface roughness
    defects in pressure die castings
    innowacyjne technologie odlewnicze
    stopy aluminium
    jakość odlewów
    chropowatość powierzchni
    defekty
    Opis:
    The presented work is aimed to deal with the influence of changes in the value of negative (relative) pressure maintained in the die cavity of pressure die casting machine on the surface quality of pressure castings. The examinations were held by means of the modified Vertacast pressure die casting machine equipped with a vacuum system. Castings were produced for the parameters selected on the basis of previous experiments, i.e. for the plunger velocity in the second stage of injection at the level of 4 m/s, the pouring temperature of the alloy equal to 640°C, and the die temperature of 150°C. The examinations were carried on for three selected values of negative gauge pressure: - 0.03, - 0.05, and - 0.07 MPa. The quality of casting was evaluated by comparing the results of the surface roughness measurements performed for randomly selected castings. The surface roughness was measured by means of Hommel Tester T1000. After a series of measurements it was found that the smoothest surface is exhibited by castings produced at negative gauge pressure value of - 0.07 MPa.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 2; 23-26
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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