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Wyszukujesz frazę "quality of surface" wg kryterium: Temat

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    Wyświetlanie 1-6 z 6
    Tytuł:
    Investigations of protective coatings for castings of high-manganese cast steels
    Autorzy:
    Holtzer, M.
    Bobrowski, A.
    Drożyński, D.
    Mocek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/382308.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high manganese cast steel
    protective coating
    silica sand
    quality of surface
    staliwo wysokomanganowe
    powłoka ochronna
    piasek kwarcowy
    jakość powierzchni
    Opis:
    When cast steel castings are made in moulding sands on matrices of high-silica sand, which has a low fire resistance the problem of the so-called chemical penetration is distinctly visible. Whereas this effect appears to a small degree only when moulding sand matrices are of chromite, zircon or olivine sands. Therefore in case of making castings of high-manganese cast steel (e.g. Hadfield steel) sands not containing free silica should be applied (e.g. olivine sand) or in case of a high-silica matrix protective coatings for moulds and cores should be used. Two protective coatings, magnesite alcoholic (marked as coating 1 and coating 2) originated from different producers and intended for moulds for castings of the Hadfield steel, were selected for investigations. Examinations of the basic properties were performed for these coatings: viscosity, thermal analysis, sedimentation properties, wear resistance. In order to estimate the effectiveness of protective coatings the experimental castings were prepared. When applying coating 1, the surface quality of the casting was worse and traces of interaction between the casting material (cast steel) and the coating were seen. When protective coating 2 was used none interactions were seen and the surface quality was better.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 1; 39-44
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Product quality assessment – measurement and analysis of surface topography
    Autorzy:
    Niemczewska-Wójcik, M.
    Sładek, J.
    Tabaka, M.
    Wójcik, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/220537.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    surface metrology
    topography
    measurement devices
    analysis of defects
    quality
    Opis:
    This paper concerns the issues of measurement techniques, analysis and assessment of the machined surface geometric structure. The aim of this work was to show the application of surface analysis in diagnosing the causes of discrepancies occurring in the manufacturing process, which may result from ill-matched (poorly fitting) process parameters. An appropriate system of control and interpretation of results may allow early reaction to unfavorable trends (for example blunting of the tool) and prevention of undesirable defects. The subject of research was a waste basket used in the construction of retaining sewer systems. In this paper, the quality of the waste basket as well as its manufacturing process were analyzed and assessed. The research was carried out with the use of three measurement stands, i.e. optical microscopy (OM), scanning electron microscopy (SEM) and white light interferometer (WLI). The surface analysis proved to be important from the viewpoint of outlining the production process as well as improving the product quality. The software used for topographical analysis appeared to be significant for the success of the analysis, providing notable economic effects, namely the lack of defects.
    Źródło:
    Metrology and Measurement Systems; 2014, 21, 2; 271-280
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of Oscillation Parameters on Surface Quality of Cast Billets
    Autorzy:
    Cibulka, J.
    Krzok, R.
    Hermann, R.
    Bocek, D.
    Cupek, J.
    Michalek, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/351593.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    continuous casting of steel
    mould oscillations
    peritectic steel grades
    billet surface quality
    Opis:
    The paper is focused on impact of different oscillation parameters on surface quality of peritectic steel grades cast into billets 150x150 mm. Hydraulic oscillation used for this purpose was temporarily installed on one strand of the billet caster. Hydraulic oscillation enables, in comparison to ordinary used electromechanical oscillation, flexible set-up of basic parameters of the oscillation cycle (negative strip time and its ratio). Proper oscillation mode is capable to assure regular oscillation marks development, good lubrication in the mould and adequate compression of the solidifying shell. Impact of an oscillation mode providing negative strip time 0.085 s and its ratio -50 % on surface quality of cast billets is compared with standard oscillation mode applied on strands equipped with electromechanical oscillation characterized with variable negative strip time between 0.084 and 0.096 s and fixed negative strip ratio to -14 %.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 1; 283-288
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The quality of precision steel castings produced in the Replicast CS process
    Jakość staliwnych odlewów precyzyjnych wytwarzanych w procesie Replicast CS
    Autorzy:
    Tomasik, J.
    Haratym, R.
    Kwapisz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/381134.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    quality of cast
    surface microgeometry
    Replicast CS process
    dimensional accuracy
    jakość odlewu
    mikrogeometria powierzchni
    proces Replicast CS
    dokładność wymiarowa
    Opis:
    The quality in ceramic mould precision casting process include mostly surface quality of casts and their dimensional accuracy represented by six sigma deviation from the nominal dimensions (ΔL6δ). This article present achieved results of examination of cast’s surface finish. The dimensional analysis accuracy of expended polystyrene patterns and castings made from these patterns was executed.
    Jakość w procesie odlewnictwa precyzyjnego w formy ceramiczne obejmuje przede wszystkim stan powierzchni odlewów i ich dokładność wymiarową rozumianą jako odchyłkę sześciosigmową wymiarów nominalnych (ΔL6δ). W artykule zaprezentowano uzyskane wyniki badań stanu powierzchni odlewów. Wykonano analizę dokładności modeli z polistyrenu i odlewów wykonanych na tych modelach.
    Źródło:
    Archives of Foundry Engineering; 2011, 11, 2 spec.; 209-212
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Use of Floster S Technology in Modified Ablation Casting of Aluminum Alloys
    Autorzy:
    Kamińska, J.
    Angrecki, M.
    Puzio, S.
    Hosadyna-Kondracka, M.
    Major-Gabryś, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/379813.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    moulding sands
    ablation casting
    water glass
    floster S
    mechanical properties of casting
    surface quality
    piaski formierskie
    odlewanie ablacyjne
    szklanka wody
    właściwości mechaniczne odlewu
    jakość powierzchni
    Opis:
    Ablation casting is a technological process in which the increased cooling rate causes microstructure refinement, resulting in improved mechanical properties of the final product. This technology is particularly suitable for the manufacture of castings with intricate shapes and thin walls. Currently, the ablation casting process is not used in the Polish industry. This article presents the results of strength tests carried out on moulding sands based on hydrated sodium silicate hardened in the Floster S technology, intended for ablation casting of the AlSi7Mg (AK7) aluminium alloy. When testing the bending and tensile strengths of sands, parameters such as binder and hardener content were taken into account. The sand mixtures were tested after 24h hardening at room temperature. The next stage of the study describes the course of the ablation casting process, starting with the manufacture of foundry mould from the selected moulding mixture and ending in tests carried out on the ready casting to check the surface quality, structure and mechanical properties. The results were compared with the parallel results obtained on a casting gravity poured into the sand mould and solidifying in a traditional way at ambient temperature.
    Źródło:
    Archives of Foundry Engineering; 2019, 4; 81-86
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    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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