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    Wyświetlanie 1-11 z 11
    Tytuł:
    Discrete Wavelet Transformation Approach for Surface Defects Detection in Friction Stir Welded Joints
    Autorzy:
    Mishra, Akshansh
    Powiązania:
    https://bibliotekanauki.pl/articles/2105144.pdf
    Data publikacji:
    2020
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
    Tematy:
    Machine Vision
    Surface Defects
    Friction Stir Welding
    Python programming
    Opis:
    Friction Stir Welding joint quality depends on input parameters such as tool rotational speed, tool traverse speed, tool tilt angle and an axial force. Surface defects formation occurs when these input parameters are not selected properly. The main objective of the recent paper is to develop Discrete Wavelet Transform algorithm by using Python programming and further subject it to the Friction Stir Welded samples for the identification of various external surface defects present.
    Źródło:
    Fatigue of Aircraft Structures; 2020, 12; 27--35
    2081-7738
    2300-7591
    Pojawia się w:
    Fatigue of Aircraft Structures
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of Cutting Edge Defects Using a Vision Method
    Autorzy:
    Sioma, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/387280.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    przetwarzanie obrazów
    sterowanie
    kontrola jakości
    3D vision system
    image processing
    surface defects
    process control
    quality control
    Opis:
    The paper discusses a vision method of assessment of laser cutting edges and surfaces of metals. It presents an analysis of the defects that occur at the edges and surfaces of components cut out in laser technology. It discusses in detail examples of defects, their causes, and methods of preventing their occurrence in the cutting process. The paper presents a vision method for the identification and assessment of defects based on selected examples. It also discusses a method of constructing a three-dimensional image of a product, issues related to the resolution of the vision system and the resolution of laser beam analysis, and methods of image analysis.
    Źródło:
    Acta Mechanica et Automatica; 2012, 6, 1; 57-62
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Local binary pattern defect recognition approach for the friction stir welded AA 1200 and AA 6061-T6 aluminum alloy
    Autorzy:
    Mishra, Akshansh
    Powiązania:
    https://bibliotekanauki.pl/articles/95297.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    local binary patterns
    friction stir welding
    machine learning
    surface defects
    lokalne wzorce binarne
    zgrzewanie tarciowe z mieszaniem materiału
    zgrzewanie tarciowe z przemieszaniem
    FSW
    uczenie maszynowe
    wady powierzchni
    Opis:
    The research reported in this paper focuses on the application of local binary patterns (LBPs) for surface defects detection. The surface defection detection algorithm for friction stir welded aluminum plates is the key part of the entire surface defect recognition system. Two different grades i.e AA 1200 and AA 6061 plates were similarly joined with the help of Friction Stir Welding process. Python codes for the proposed algorithm were executed on Google Colaboratory platform. The results obtained prove that the local binary patterns method can be used for real-time surface defects detection in friction stir welded joints.
    Źródło:
    Journal of Mechanical and Energy Engineering; 2020, 4, 1; 27-32
    2544-0780
    2544-1671
    Pojawia się w:
    Journal of Mechanical and Energy Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on the process of superfinishing ceramic surfaces of cutting plates
    Autorzy:
    Musiał, W.
    Choromańska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/100001.pdf
    Data publikacji:
    2012
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    ceramic cutting plates
    superfinishing surface layer
    defects
    Opis:
    This paper presents initial research on the surfaces of cutting ceramic plates ground using diamond grinding wheels. Ceramic materials were ground using a piezoelectric feed-in system whose aim was to minimize the effect of brittle cracking of the ceramic material in the machining zone. Due to precise machining it is possible to smooth out the machined surface by ductile-regime grinding the material removal mechanism and, in consequence, reducing the defects on its surface and in the surface layer of the ground material.
    Źródło:
    Journal of Machine Engineering; 2012, 12, 4; 63-70
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Radiation-stimulated changes in the characteristics of surface-barrier AL–SI–BI structures with different concentrations of dislocations at the crystal surface
    Autorzy:
    Pavlyk, B.
    Kushlyk, M.
    Slobodzyan, D.
    Matvijishyn, I.
    Lys, R.
    Jałbrzykowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/386556.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    silicon
    dislocations
    surface-barrier structures
    surface layers
    radiation
    reconstruction of defects
    Opis:
    We report the results of studies for the radiation-stimulated changes in electro-physical characteristics of surface-barrier Al–Si–Bi structures based on p-Si. We demonstrate that the X-ray irradiation is accompanied by different processes which depend on the density of the dislocations in the original silicon crystals. A usual evolution of the existing structural defects and their radiationstimulated ordering dominate when the concentration remains low enough. Increase in the concentration causes the increasing role of generation of additional radiation defects. Modelling of the underlying physical processes has testified that the near-contact Si layers are strained. They act as getters for the structural defects and impurities.
    Źródło:
    Acta Mechanica et Automatica; 2018, 12, 1; 72-77
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of atmosphere in a foundry mould on casting surface quality
    Autorzy:
    Chojecki, A.
    Mocek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/382388.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    forma piaskowa
    wada powierzchni odlewu
    stężenie wodoru
    żeliwo sferoidalne
    sand mould
    defects on casting surface
    hydrogen concentration
    ductile iron
    Opis:
    Changes of gas pressure in the moulding sand in the zone adjacent to mould cavity were analysed during pouring of cast iron. No significant effect of pressure on the surface quality of castings was observed. In the second series of tests, the concentration of hydrogen in the gas atmosphere was measured. It has been found that the value of this concentration depends on metal composition and is particularly high in cast iron containing magnesium. This is due to the reduction of water vapour with the element that has high affinity to oxygen. The presence of hydrogen causes the formation of gas-induced defects on the casting surface.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 1; 13-18
    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:
    Effect of oxidation and mechanical damage of PCBs with OSP finish on their solderability with SAC305 alloy
    Wpływ utleniania i uszkodzeń mechanicznych powierzchni płytek PCB z pokryciem OSP na ich lutowność stopem SAC305
    Autorzy:
    Kudyba, A.
    Siewiorek, A.
    Sobczak, N.
    Turalska, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/391438.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
    Tematy:
    surfaces
    coatings
    electronic characterization
    defects
    surface properties
    solderability
    wetting balance test
    powłoki
    wady
    właściwości powierzchni
    lutowność
    badania meniskograficzne
    Opis:
    The paper focuses on the experimental investigation of wetting behavior and solderability of commercial lead-free solder on Printed Circuit Board (PCB) covered with an OSP finish (Organic Surface Protectant) characterized by physical (mechanically scratched) and/or chemical (oxidized in air at 260°C for 1 hour) inhomogeneity of the surface finish. The influence of the quality of the PCB finish on the maximum wetting force Fmax, wetting time t0, the contact angle θ, and the parameters characterizing solderability, were studied. The tests were performed by a wetting balance method with SAC305 solder (Sn-3.0Ag-0.5Cu, wt. %) and commercial flux (EF2200) using MENISCO ST88 apparatus allowing direct measurement of the wetting force Fr and wetting time t0 as well as calculation of the contact angle θ values. The measurements were made at a temperature of 260°C for a contact time of 3 s. For comparison, the tests were also performed on PCBs in delivery state showing average Fmax = 0.9 mN, t0 = 0.58 s and θ = 57°. The results have shown that both oxidation and mechanical damage of the OSP finish have a significant worsening effect on solderability. Scratched OSP finish had an average Fmax = -1.03 mN and θ = 78°. Such surfaces were non-wettable with corresponding values of Fmax = -4.7 mN and θ = 120° for oxidized samples and Fmax = -4.04 mN and θ = 111° for those scratched and oxidized.
    W pracy badano zwilżalność i lutowność płytek drukowanych (PCB) z pokryciem OSP, które charakteryzowały się niejednorodnością występującą na powierzchni: były mechanicznie porysowane i/lub utlenione (na powietrzu, w temperaturze 260°C w czasie 1 godziny). Do badań stosowano komercyjny stop bezołowiowy. Określono wpływ jakości pokrycia na wartość maksymalnej siły zwilżania Fmax, czas zwilżania t0 i kąt zwilżania θ, czyli parametrów charakteryzujących lutowność. Badania prowadzono metodą zanurzeniową (meniskograficzną) na aparaturze ST88 MENISCO, która umożliwia bezpośredni pomiar siły zwilżania Fr i czasu zwilżania t0, jak również obliczenie wartości kąta zwilżania θ. Pomiary przeprowadzono w temperaturze 260°C w czasie 3 s. Dla porównania testy przeprowadzono również na płytkach „w stanie dostawy”, uzyskując średnią Fmax = 0.9 mN, t0 = 0,58 s i θ = 57°. Uzyskane wyniki świadczą, że zarówno utlenianie powierzchni, jak i uszkodzenia mechaniczne pokrycia OSP powodują znaczące pogorszenie lutowości płytek PCB. Dla pokrycia OSP, które było porysowane, uzyskano średnio Fmax = -1,03 mN i θ = 78°. Dla próbek utlenionych mierzone wartości wyniosły: Fmax = -4,7 mN i θ = 120°, natomiast dla próbek porysowanych i utlenionych: Fmax = -4,04 mN i θ = 111°.
    Źródło:
    Prace Instytutu Odlewnictwa; 2015, T. 55, nr 4, 4; 59-66
    1899-2439
    Pojawia się w:
    Prace Instytutu Odlewnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Casting Defects Filling by Low Pressure Cold Spraying Method
    Autorzy:
    Piwowarczyk, T.
    Winnicki, M.
    Małachowska, A.
    Ambroziak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/382335.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    casting defects
    surface treatment
    Low Pressure Cold Spraying
    LPCS
    bond strength
    wady odlewów
    obróbka powierzchniowa
    natryskiwanie na zimno
    przyczepność
    Opis:
    In this paper the possibilities of using Low Pressure Cold Spraying (LPCS) method for filling the casting defects are presented. In Cold Spraying there is no metallurgical bonding because powder particles are deposited in solid state. The effect of high temperature on both substrate and coating structure is avoided. In performed experiments coatings of Al, Zn and Sn powders with addition of Al2O3 ceramic were deposited onto chosen aluminium alloys substrates. Two the most important mechanical properties of Cold Sprayed coatings, i.e. bond strength and microhardness, were analysed. Coatings bond strength was determined by tensile pull test. Coatings microstructure was examined with the use of scanning electron microscope (SEM) analysis. LPCS method potential applications in castings repair is shown.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 1 spec.; 109-114
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Role of Sand Grains in Sorption Processes by Surface Layers of Components of Sand Moulds
    Autorzy:
    Kaźnica, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/383033.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    castings defects
    moisture sorption
    surface layer
    furan moulding sands
    sand grains
    wady odlewnicze
    wilgoć
    warstwa powierzchniowa
    masa formierska furanowa
    furan
    Opis:
    The results of researches of sorption processes of surface layers of components of sand moulds covered by protective coatings are presented in the hereby paper. Investigations comprised various types of sand grains of moulding sands with furan resin: silica sand, reclaimed sand and calcined in temperature of 700 oC silica sand. Two kinds of alcoholic protective coatings were used – zirconium and zirconium – graphite. Tests were performed under condition of a constant temperature within the range 30 – 35oC and high relative air humidity 75 - 80%. To analyze the role of sand grains in sorption processes quantitavie moisture sorption with use of gravimetric method and ultrasonic method were used in measurements. The tendency to moisture sorption of surface layers of sand moulds according to the different kinds of sand grains was specified. The effectiveness of protective action of coatings from moisture sorption was analyzed as well. Knowledge of the role of sand grains from the viewpoint of capacity for moisture sorption is important due to the surface casting defects occurrence. In particular that are defects of a gaseous origin caused by too high moisture content of moulds, especially in surface layers.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 1; 87-92
    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 1-11 z 11

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