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    Wyświetlanie 1-11 z 11
    Tytuł:
    Study on the Machinability of Glass, Carbon and Aramid Fiber Reinforced Plastics in Drilling and Secondary Drilling Operations
    Autorzy:
    Ciecieląg, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/2181747.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    polymer composites
    machining
    drilling
    roughness
    feed force
    drilling conditions
    Opis:
    Composite materials are usually subjected to machining processes, especially when they are used to for the aviation and automotive industries. Apart from side surface milling and face milling, these materials are subjected to machining to make holes and countersinking holes, cuts of complex shape, recesses, and grooves. One of the many machining methods for polymer composites is drilling. The accuracy of a drilled hole is very important for operational reasons, because it has impact on the quality and strength of the connection between polymer composite elements and structural elements. This paper shows the results of a study investigating the impact of drilling and secondary drilling as well as technological drilling parameters on the maximum feed force, surface roughness and hole quality. Holes were drilled in glass, carbon and aramid fiber reinforced plastics. The study has shown that the highest maximum feed force occurs when drilling in aramid fiber reinforced plastic. The lowest values of the maximum feed force were obtained when drilling in glass fiber reinforced plastic. The influence of drilling parameters on surface roughness during drilling holes in composite materials was also determined. The highest values of roughness parameters were obtained in the machining of aramid fiber reinforced plastic, while the lowest roughness parameters were obtained on the hole surface when drilling in carbon fiber reinforced plastic.
    Źródło:
    Advances in Science and Technology. Research Journal; 2022, 16, 2; 57--66
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Composite Material Fixing on Hole Accuracy and Defects During Drilling
    Autorzy:
    Ciecieląg, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/2123286.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    drilling
    delamination
    carbon fiber reinforced plastics
    glass fiber-reinforced plastics
    feed force
    Opis:
    This study investigates the effect of composite material stiffness on the accuracy of drilled holes and delamination in the drilling process. Two types of composite materials were tested: glass fiber reinforced plastic (GFRP) and carbon fiber reinforced plastic (CFRP). The drilling process was performed using dedicated drill bits. Samples were clamped in a vice of the Avia-VMC 800 HS vertical machining center. Drilling parameters were maintained constant but unsupported element length was changed. The unsupported element length was defined as an unsupported distance between the drilled hole axis and the sample attachment location. The maximum feed force Ff was determined in the experiments. The accuracy of drilled holes was estimated by optical microscopy. Diameters of the drilled holes were measured. Results made it possible to determine the recommended unsupported element length at which the hole dimensions were within the dimensional tolerance. The study showed a clear decrease in the drilled hole quality and a significant increase in the feed force, especially in the area of tool exit from the workpiece. In addition, the number of delaminated fibers increased with unsupported element length was determined in the study.
    Źródło:
    Advances in Science and Technology. Research Journal; 2021, 15, 3; 54--65
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Investigation and Optimization of Machining Parameters in Turning of Aluminum Alloy 075-T651
    Autorzy:
    Srivastava, Arpit
    Verma, Mukesh Kumar
    Niranjan, Ramendra Singh
    Chandra, Abhishek
    Patel, Praveen Bhai
    Powiązania:
    https://bibliotekanauki.pl/articles/26072641.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    metoda Taguchiego
    siła posuwowa
    siła skrawania
    siła promieniowa
    MRR
    Taguchi method
    feed force
    cutting force
    radial force
    Opis:
    Aluminum alloy 7075-T651 is a widely used material in the aviation, marine, and automobile sectors. The wide application marks the importance of this material’s research in the manufacturing field. This research focuses on optimizing input process parameters of the turning process in the machining of Aluminum 7075-T651 with a tungsten carbide insert. The input machining parameters are cutting speed, feed, and depth of cut for the output response parameters cutting force, feed force, radial force, material removal, and surface roughness of the workpiece. For optimization of process parameters, the Taguchi method, with standard L9 orthogonal array, is used. ANOVA is applied to obtain significant factors and optimal combinations of process parameters.
    Źródło:
    Production Engineering Archives; 2021, 27, 4; 296--305
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ wybranych parametrów skrawania na dokładność obróbki w procesie wiercenia stopu Ti6Al4V
    Effect of cutting parameters in the aspect of the accuracy of drilling processing titanium alloys Ti6Al4V
    Autorzy:
    Szwajka, Krzysztof
    Zielińska-Szwajka, Joanna
    Powiązania:
    https://bibliotekanauki.pl/articles/945987.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
    Tematy:
    wiercenie
    siła posuwowa
    moment skrawania
    wióry
    stop tytanu
    drilling
    feed force
    cutting moment
    chips
    titanium alloy
    Opis:
    Wiercenie materiałów ciągliwych, do których zalicza się Ti6Al4V, często wiąże się z niewystarczającym odprowadzeniem wiórów, co prowadzi do wystąpienia zakłóceń procesu obróbki. Wióry powstające w trakcie procesu wiercenia materiałów plastycznych są ciągliwe i mają skłonność do gromadzenia się w rowkach wiórowych narzędzia. Takie gromadzenie się wiórów może skutkować zarysowaniami powierzchni otworu, przyklejeniami materiału do narzędzia skrawającego, a także do przyśpieszonego zużycia ostrza skrawającego. W niniejszym artykule przedstawiono wyniki badań uzyskane w procesie wiercenia stopu tytanu Ti6Al4V w aspekcie dokładności wymiarowo-kształtowej uzyskanych otworów. Obróbkę prowadzono bez chłodziwa (na sucho) przy różnych zestawach parametrów skrawania. W ramach badań monitorowano siłę posuwową i moment skrawania, dokładność kształtowo-wymiarową, jakość powierzchni otworu oraz kształt wiórów. Wyniki badań pokazują, że zarówno jakość otworu, jak i jego dokładność wymiarowo-kształtową można poprawić przez odpowiedni dobór parametrów skrawania. Ponadto, obserwacja powierzchni na wyjściu narzędzia z materiału wskazywała na występowanie odkształceń plastycznych (zadziory) związanych z parametrami skrawania. Wyniki eksperymentu wykazały także, że na kształt i wielkość zadziorów istotny wpływ ma prędkość posuwu.
    The drilling of ductile materials, such as Ti6Al4V, is often associated with insufficient chip evacuation, resulting in disturbances in the machining process. Chips formed during the drilling process of plastic materials are ductile and tend to accumulate in the chip flutes of the tool. Such chip formation may result in scratches on the hole surface, sticking the material to the cutting tool, and also on accelerated wear of the cutting edge. This article presents the analysis of the drilling process and assessment of the quality of the hole after drilling Ti6Al4V titanium alloy without coolant at various processing parameters. As part of the research, the feed force and cutting moment were monitored, the shape and dimensional accuracy and the quality of the hole surface and the shape of the chips. The test results show that the hole quality can be improved by appropriate selection of cutting parameters. Observation of the surface at the exit of the tool from the material indicated plastic deformation (burrs) in different cutting conditions. The results of the experiment also showed that the shape and size of burrs is strongly influenced by the feed speed.
    Źródło:
    Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika; 2019, z. 91 [299], 1-2; 79-92
    0209-2689
    2300-5211
    Pojawia się w:
    Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Proposal for an Indexical Method of Evaluating Risk of Hand Tool Operators’ Exposure to Mechanical Vibrations
    Autorzy:
    Engel, Z.
    Kowalski, P.
    Zawieska, W. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/90780.pdf
    Data publikacji:
    2002
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    hand-arm vibration
    tool
    feed force
    griping force
    drgania
    narzędzia ręczne
    zagrożenia zdrowia
    operator maszyn i urządzeń
    siła mięśni
    siła chwytania
    ręka
    Opis:
    The article presents proposals for an indexical evaluation of exposure of hand tool operators to vibrations. The presented indices have been developed on the basis of the results of laboratory tests. The examinations studied the effect of pressure force and grip force exerted by an operator on a hand tool as well as the amplitudes and frequencies of an exciting signal on vibrations transmitted in the hand-tool handle system.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2002, 8, 2; 183-194
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Testing of force sensors for the active measurement and limitation of axial loads in heavy turning
    Autorzy:
    Kasprzak, Marcin
    Pyzalski, Michal
    Powiązania:
    https://bibliotekanauki.pl/articles/2052200.pdf
    Data publikacji:
    2021
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    feed drive load
    heavy turning
    force sensor
    Opis:
    This article describes the design and construction of a feed drive load measuring system based on industrial strain gauges installed in the machine tool structure. The system was calibrated and dynamically tested in the range of 15 kN in real machining conditions. The tests showed that the system installed on a machine tool works correctly and its error amounts to about 5% of the measured range. Thanks to this measuring system the accuracy of the machine tool in machining conditions can be increased through the active compensation of the axial error caused by displacements. Moreover, the system can prevent tool breakage and increase machining efficiency.
    Źródło:
    Journal of Machine Engineering; 2021, 21, 4; 106-117
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation investigation of ball screws for high speed transmitting systems
    Autorzy:
    Sobolewski, J. Z.
    Małkiński, J.
    Pieniecki, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1429177.pdf
    Data publikacji:
    2008
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    ball screw
    CNC feed systems
    rigidity
    impact force
    Opis:
    The ball screws are used in feed systems in CNC machines working with constantly higher cutting speed. When the speed of the balls reaches certain levels, the repetitive chock (impact forces) generated by the balls in the "transient" phase of the balls' motion and forces acting in the return channel cause damage to the recirculation ball system. A simulation of impact forces for variable length of transient phase in function of the rotational speed was made. The static axial rigidity is a very important factor to be considered in defining ball screws performance and exerts a major influence on positioning accuracy of NC machine tools. One of rigidity components is the balls/balltrack area rigidity, dependent on Hertz's deflections. However, due to machining inaccuracies, the ball screws properties (especially rigidity) are considerably lower than the theoretical ones. A coefficient known as the geometric correction factor makes it possible to predict the rigidity of the ball screw. A computer simulation of the influence of machining inaccuracies on contact deflections, rigidity and servo drive resonance was carried out. It was examined what rotational speeds set off the harmful phenomenon of the agreement of the frequency of the arrangement of the impact forces with the frequency of the servo drive system resonance. The presented method allows for the calculation of the impact forces, total rigidity and resonance of NC machine feed system, in the preliminary phase of technical project.
    Źródło:
    Journal of Machine Engineering; 2008, 8, 4; 59-67
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation Testing of the Machine Tool Equipped With the Active Feed Drive
    Autorzy:
    Sveda, J.
    Valasek, M.
    Sika, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/971162.pdf
    Data publikacji:
    2009
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    machine tool
    feed drive
    control loop simulation
    cutting force
    vibration suppression
    Opis:
    The vibration of a machine tool is mainly caused by the dynamic acceleration of a motion axis and by the forces that act on it. All the disturbance forces are transmitted to the machine tool frame through the drive (motor) and its regulation loop and they excite its vibrations. Thus the achievable dynamics and machining quality is negatively influenced. There are several possibilities how to suppress the excited vibrations including the recently introduced "motor on motor" technique which is based on the serial connection of two linear motors. This paper presents new simulation results performed on the simulation model of a real machine tool. The maximal achievable tuning of the regulation loop parameters of the motion axis equipped with the "motor on motor" technique was confronted with the conventional feed drive setting. The "motor on motor" feed drive properties were also tested in the virtual machining operation mode where the real measured cutting force was used. The sensitivity analysis of the reaction force and the middle mass movement of the "motor on motor" feed drive solution to the predicted cutting force introduced to the feed drive control has been investigated. The middle mass is represented by the shared part of both linear motors which absorbs the high frequency part of the reaction force by its movement.
    Źródło:
    Journal of Machine Engineering; 2009, 9, 2; 81-92
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    End milling of Ti-48Al-2Cr-2Nb under high-feed conditions
    Autorzy:
    Finkeldei, Daniel
    Bleicher, Friedrich
    Powiązania:
    https://bibliotekanauki.pl/articles/99517.pdf
    Data publikacji:
    2019
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    cemented carbide cutting tools
    titanium aluminides
    specific cutting force
    high feed machining
    Opis:
    Gamma titanium aluminides are fast developing materials and particularly in use for aerospace and automotive components. Due to the high cutting forces and raised cutting temperatures achieved during milling of this material, tool-wear is a crucial factor. Thus, increasing of the cutting speed leads to a significant rise of the cutting temperature. On the one hand, the implementation of innovative cooling strategies can reduce the heat flux in the cutting tool. On the other hand, analysing of the heat generation during the cutting process can lead to improved machining strategies. Previous research attempts assess microstructural and chip formation, as well as tool-wear in finish milling of this material. However, few have investigated the optimal cutting strategies in roughing and finishing of titanium aluminides. In this study, the milling operation under high feed rate should be investigated and the potential to improve chip removal rate and tool life should be determined.
    Źródło:
    Journal of Machine Engineering; 2019, 19, 2; 63-72
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Investigation of Process Parameters in Drilling LM25 Composites Coated with Multi Wall Carbon Nano Tubes Using Sonication Process
    Autorzy:
    Sangeetha, M.
    Prakash, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/352817.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    drilling
    feed rate
    Hybrid Metal Matrix Composites
    response surface methodology
    sonication
    thrust force
    Opis:
    Aluminium based metal matrix composites are widely used in automobile components such as cardan shaft of Chevrolet corvette, disc brake and engine push rod. In this experiment a Hybrid Metal Matrix Composites (HMMC) are fabricated and drilled. Drilling is the process of making slots in disc brake and thread in the engine parts. The surface quality of the drilled specimen depends on the speed, feed, drill type and the thrust force. Thrust force plays the major role in drilling the specimen. In this experiment HMMCs are fabricated using two processes-called, sonication and casting. Sonication is the process of coating the carbon nanotubes over the silicon carbide particles (SiCp). Semisolid stir casting is used to reinforce the coated SiCp in the LM 25 alloy. A drilling process is performed on HMMC to analyse the extent to which the input parameters influence the thrust force and Ovality. The tools used for drilling are solid carbide tools of three different diameters. Taguchi’s experimental design is adopted for the drilling operation. A mathematical model is used to determine the influence of input parameters on the outputs thrust force and ovality. This paper proves the combination of N3 , f1 and d1 of the carbide tool results in the lowest value of thrust force and ovality while drilling HMMCs. In this work the HMMC is prepared by coating the abrasive nature, silicon carbide particle and there is a good interfacial bonding between the reinforced particle and matrix and the drilling process becomes smoother. The new being of this article is the treated ceramics, SiCp with carbon nanotubes. This HMMC shows the improved mechanical properties compared to other metal matrix composites surveyed in the literatures.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 3; 1761-1770
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Probability-statistical estimation method of feed influence on the tangential cutting force under turning
    Autorzy:
    Krupa, V.
    Tymoshenko, N.
    Kobelnyk, V.
    Petrechko, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/2201054.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    tangential cutting force
    cutting depth
    stochasticity feed
    distribution law
    distribution characteristics
    siła skrawania
    głębokość skrawania
    posuw
    rozkład
    Opis:
    Purpose This research aims to develop the mathematical model and propose a method for estimating the feed stochasticity impact on the tangential cutting force during turning. The main reason for this research is that the existing models for determining the tangential component of the cutting force do not take into account the stochasticity of the feed rate. Design/methodology/approach Measurements of tangential cutting force during turning on general-purpose lathes with known feed dispersion parameters were made. The mathematical model was developed, and dispersion characteristics (mean value, dispersion and mean square deviation) of the tangential cutting force component depending on the corresponding dispersion characteristics of the feed rate were obtained. The method of assessing the impact of stochasticity of the feed rate on the tangential cutting force is proposed. Findings As the result of the carried-out investigations, it is proved that the stochasticity of the feed rate affects the dispersion of the tangential cutting force during turning. For specific conditions, the share of feed stochasticity in the dispersion of tangential cutting force component is from 40 to 60% and should be taken into account while prescribing rational cutting modes. Practical implications The obtained results make it possible to adjust the cutting modes, particularly the amount of feed, under the conditions of real equipment to ensure certain power characteristics of the cutting process to prevent overloads during cutting. This investigation benefits to the establishment of additional factors affecting oscillations in the cutting process. Originality/value The probabilistic-statistical approach is used in this investigation in order to prove that the stochasticity of the feed rate affects the dispersion of the tangential cutting force component.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2022, 114, 1; 22--31
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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