Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "hole drilling" wg kryterium: Temat

  Lista filtrów
Wyrównaj
    Wyświetlanie 1-14 z 14
    Tytuł:
    Investigation of the shape accuracy of cylindrical holes machined by EDM process
    Autorzy:
    Spadło, S.
    Dudek, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/99888.pdf
    Data publikacji:
    2012
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    electrical discharge machining
    hole drilling
    shape accuracy
    Opis:
    The paper deals with the investigations of influence parameters of electrodischarge machining (EDM) on the shape accuracy of holes machined by EDM process. BP-95. machine with electronic generator type was used to perform EDM process. Kerosene was used as a dielectric. During EDM process the parameters of current were permanent. The shape of electrode and way of passing dielectric were changed. The following parameters were determined: productivity of EDM process and shape accuracy of the drilling holes. The accuracy of bored cylindrical holes, is highest in case of hollowing out with the tubular electrode and for sucking out working liquid by her inner life. In the case of hollowing out with the electrode tubular, sinking the tube with pumping liquid by the inner life is the most favourable method causing the smallest mistakes of outlines of the cylindrically shape. The time of boring the arterial hole is shortest in case of hollowing out with the electrode tubular and for pumping working liquid by inside.
    Źródło:
    Journal of Machine Engineering; 2012, 12, 2; 98-104
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wear analysis of a gun barrel drill blade in 1.0503 steel drilling process in Milpro HG12 oil environment with addition of ultra-dispersive copper particles and copper oxides
    Autorzy:
    Rychlik, Kazimierz
    Senderowski, Cezary
    Powiązania:
    https://bibliotekanauki.pl/articles/298015.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie
    Tematy:
    barrel drill
    deep hole drilling
    long holes
    Opis:
    This paper presents structural solutions for guiding a single-sharp barrel drill blade during deep hole drilling, and it analyzes the structural and technological problems associated with two modes of inserting the drill into the processed material in the first stage of drilling – with the use of a pilot hole or a guide sleeve. The kinematics of the object-tool system (P-N) and other technological parameters affecting the execution of pilot holes under strictly defined conditions were analyzed during deep drilling with barrel drills in the FNE 40NC AVIA vertical numerical milling machine. Performance tests involving two types of cooling-lubricating agents, Milpro HG12 oil with and without the addition of ultra-dispersive copper particles and copper oxides (0.05 ÷ 0.6 µm) and Panther GP-1 additive (PWPH PantherOil Poland), applied in a 1:100 ratio, were described. The wear of the barrel drill blade along the entire drilling path (Lw = 8,000 mm) for 112 holes, and the geometric wear coefficient Kw of the drill bit were determined in 1.0503 steel with the use of EB80 drills made of K15 cemented carbide (WC 94%, Co 6%) with a diameter Dc = 8 mm. The results of wear tests were compared with the results of tribological tests involving cooling lubricants and 1.0503 steel with the chemical composition of K15 tungsten carbide. The abrasive wear of friction pair and the performance of the barrel drill blade during deep hole drilling were analyzed under identical conditions.
    Źródło:
    Technical Sciences / University of Warmia and Mazury in Olsztyn; 2019, 22(3); 221-235
    1505-4675
    2083-4527
    Pojawia się w:
    Technical Sciences / University of Warmia and Mazury in Olsztyn
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Relation of process and condition monitoring at deep hole drilling
    Autorzy:
    Heisel, U.
    Sabou, F.
    Maier, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/100005.pdf
    Data publikacji:
    2012
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    process
    condition monitoring
    deep hole drilling
    main spindle
    Opis:
    Process monitoring and condition monitoring are closely related. The basic structure of the tasks is the same. In some cases the may even use the same set of raw data. Monitoring of a process is also influenced by the machine's state. Therefore, the state has to be monitored also. In most cases wear causes a divergence of the intended from the actual state. The paper presents the principles of monitoring the condition of a main spindle as well as monitoring the process of deep hole drilling.
    Źródło:
    Journal of Machine Engineering; 2012, 12, 1; 99-110
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Drilling bits in percussive-rotary drilling technology (down the hole DTH)
    Autorzy:
    Śliwa, T.
    Śnieżek, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/298928.pdf
    Data publikacji:
    2012
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    drillbits
    down-the-hole (DTH) drilling
    Opis:
    This paper addresses the issue of drillbits for drilling normal and large diameter boreholes with the use of percussion-rotary method. The most important elements of drillbits, i.e. sintered carbide inserts of different shapes have been described. The hardness of the drilled rock determines the shape of used sintered carbide inserts and the shape of the drillbit face. The cluster hammers, used for drilling large diameter DTH, have been also presented.
    Źródło:
    AGH Drilling, Oil, Gas; 2012, 29, 4; 453-462
    2299-4157
    2300-7052
    Pojawia się w:
    AGH Drilling, Oil, Gas
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Utilization of high potential geothermal energy in the Czech Republic
    Autorzy:
    Klempa, M.
    Rado, R.
    Bujok, P.
    Janeckova, N.
    Porzer, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/299000.pdf
    Data publikacji:
    2016
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    geothermal energy
    enhancing geothermal system
    deep geothermal energy
    geothermal response test
    drilling technology
    down-the-hole drill (DTH) drilling technology
    drilling tools
    wellbore design
    Opis:
    In the Czech Republic the electrical energy and heat from geothermal energy can be generated with the use of Engineering/Enhancing Geothermal System (EGS). In this case a downhole heat exchanger is performed to a depth at which the temperature of the rock mass is at least 150–160°C or more, preferably about 200°C. Taking into account the geological conditions in the Czech Republic, such temperatures can be ob- served at about 5000–6000 m of depth. The site of a pilot project of geothermal electrical energy production was selected on the basis of the analysis of deep-seated geological structures in the Czech Republic, i.e. area of crust faults in the Ore Mountains Erzgebirge. The selected geological units consist of the Ore Mountains Fault and Central Bohemian Uplands, which are part of the Ohersky Rift Valley. Two deep research wells are planned in that area, with detailed geological, geophysical and geothermal analyses, including laboratory analyses of sampled rocks (cores).
    Źródło:
    AGH Drilling, Oil, Gas; 2016, 33, 1; 195-203
    2299-4157
    2300-7052
    Pojawia się w:
    AGH Drilling, Oil, Gas
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modern methods of elimination of lost circulation in directional wells
    Autorzy:
    Ivanova, Tatiana N.
    Żabińska, Iwona
    Powiązania:
    https://bibliotekanauki.pl/articles/1537993.pdf
    Data publikacji:
    2021
    Wydawca:
    STE GROUP
    Tematy:
    liquidation of acquisitions
    drilling tool run-in-hole/put-out-of-hole
    restoration of circulation
    drilling process
    lowering or cementing of the production casing
    Opis:
    Losses of drilling mud and other fluids is the one of the major types of drilling troubles. Annual time losses for their elimination by oil and gas companies are huge. The factors, influencing the mud losses and regulating the direction of the further works, can be divided into two groups: geological and technological. Conducted studies on the use of an insulating composition based on chromium acetate made it possible to identify: the use of the insulation composition on the chrome acetate base allows considerable reduction of time required to eliminate disastrous circulation loss without installation of cement plugs; avoiding BHA replacement; avoiding drilling-in after bullheading and overlapping of lost-circulation layer; low cost, possibility of fast preparation, as it does not entail the delivery of additional chemicals, which also contributes to reduction of time required to eliminate disastrous circulation loss; the use with every type of drilling mud. Basing on the positive experience of the use of this composition in the neighboring regions and considering its economic side, the technique can be used in regions of the Udmurt Republic.
    Źródło:
    Management Systems in Production Engineering; 2021, 1 (29); 65-74
    2299-0461
    Pojawia się w:
    Management Systems in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of an adaptronic spindle for a faultless machining of homogeneous and inhomogeneous materials
    Autorzy:
    Dobrinski, Alexander
    Möhring, Hans-Christian
    Stehle, Thomas
    Powiązania:
    https://bibliotekanauki.pl/articles/1429106.pdf
    Data publikacji:
    2021
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    drilling process
    adaptronic spindle
    qualitative drill hole
    Opis:
    One of the latest topics in construction concerns the difficulty of producing faultless drill holes in parts made of composite and sandwich materials. At the Institute for Machine Tools of the University of Stuttgart, a prototype of an adaptronic drilling spindle for a machining of components made of homogeneous and inhomogeneous materials was developed within the framework of a research project, funded by the Federal Ministry for Economic Affairs and Energy. The spindle made it possible to limit the axial force and the torque acting on the tool, thus protecting the tools and the workpieces from any possible damage. The tests carried out with the spindle prototype proved that the axial feed force acting from the spindle can be reliably controlled by means of the developed spindle. It might be possible to restrict critical machining situations arising due to the removal of drill chips or the reduction of process temperatures.
    Źródło:
    Journal of Machine Engineering; 2021, 21, 2; 5-23
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Drilling intake wells in carbonate formations to provide water for drilling purposes
    Autorzy:
    Macuda, Jan
    Łukańko, Łukasz
    Powiązania:
    https://bibliotekanauki.pl/articles/2052213.pdf
    Data publikacji:
    2020
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    well drilling
    percussion‑rotary drilling
    down‑the‑hole hammer
    drilling technology
    wellbore structures
    Opis:
    The realization of drilling works oriented towards the prospection and extraction of hydrocarbons from conventional and unconventional resources requires the supply of large amounts of water for technological purposes and fracturing jobs in shale formations. One of the important sources of water supply for wellbores may be useful groundwater levels taken in by deep wells. Technological processes accompanying drilling works and other technological operations require large amounts of water in a short period of time. The possibility of drilling intake wells at the drilling site significantly reduces the costs of acquiring the necessary quantities of water and facilitates its transfer to technological installations. Such wells must have high yields. Accordingly, this necessitates drilling wells with a relatively large diameter to accommodate filters with a large active surface area, a considerably thick gravel pack, and a high‑capacity pumping unit. Drilling large diameter intake wells in difficult geological conditions using the rotary percussion method with simultaneous casing is much more efficient than the water‑based rotary mud or percussion methods used to date. This paper presents principles for selecting technological parameters of drilling large diameter wells in difficult geological conditions using the percussion‑rotary method with simultaneous casing. Among the main advantages of this method (as compared to the rotary method with drilling fluid) is its high RPM and the related lower cost of the well. Eliminating water‑based drilling mud has a positive effect on the hydraulic efficiency of the well and enhancement work can be omitted in many cases.
    Źródło:
    AGH Drilling, Oil, Gas; 2020, 37, 1; 5-12
    2299-4157
    2300-7052
    Pojawia się w:
    AGH Drilling, Oil, Gas
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the use of a down-hole mechanical cleaning device for efficient wellbore cleaning
    Analiza wykorzystania wgłębnych mechanicznych urządzeń czyszczących do skutecznego oczyszczania otworu
    Autorzy:
    Qureshi, A.
    Miska, S.
    Miska, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/299975.pdf
    Data publikacji:
    2007
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    wiercenie
    oczyszczanie dna otworu
    otwory horyzontalne
    drilling
    down-hole mechanical cleaning
    horizontal wells
    Opis:
    Field evidence indicates that in highly deviated and horizontal wells, cuttings tend to accumulate on the lower side of the annulus under the influence of gravity and eventually may form a non moving bed. This leads to considerable increase in equivalent circulating density (ECD) and drag/torque as well may result in a differential pipe sticking and wellbore stability problems. A good control of drilling fluid rhelogical properties, flow rate and drillpipe rotational speed may not be sufficient in some instances. Also, the commonly used techniques of circulation at high flow rates, using sweeps of high/low viscosity and high density may not be possible and, at times, prove to be ineffective. To overcome this difficulty, a down hole cleaning subs (mechanical cleaning devices - MCDs) are incorporated in the drill string to agitates the cuttings bed by bringing the cuttings into suspension for subsequent carrying out by the drilling fluid to the surface. These devices are furnished with "blades" which produce the desired hydrodynamic effects as the drill string is rotated and helps to dislodge the cuttings from the bed. The hole cleaning is thus governed primarily by the agitation created by the device, the rheological properties of the mud and the drilling fluid flow rate. Taking these factors into account, a study was conducted at Tulsa University Drilling Research Projects' (TUDRP) large scale wellbore simulator to experimentally determine the cleaning efficiency of a Mechanical Cleaning Device (MCD). From the database generated through the experiments, correlations were obtained by performing regression modeling to extend the results to field applications. These correlations are based on dimensionless parameters and predict reasonably accurately the in-situ cuttings concentration when the MCD is installed in the drill string. The results are useful for designing of the optimal hydraulic program for extended reach, high angle and horizontal wells.
    Z danych terenowych wynika, że w silnie odchylonych i poziomych otworach wiertniczych zwierciny gromadzą się w dolnej części przestrzeni pozarurowej pod wpływem siły grawitacji. Prowadzi to do znacznego wzrostu ECD oraz momentu; może również spowodować zablokowanie rury oraz problemy z zachowaniem stabilności otworu. Właściwa kontrola właściwości reologicznych, wielkości przepływu i prędkości obrotowej w niektórych przypadkach może okazać się niewystarczająca. Również powszechnie stosowane techniki intensywnej cyrkulacji, a także z wykorzystaniem cieczy o wysokiej/niskiej lepkości oraz dużej gęstości mogą okazać się niemożliwe lub nieskuteczne. Do pokonania tej trudności na przewodzie zastosowano mechaniczne wgłębne urządzenie czyszczące w celu pobudzenia zwiercin i utworzenia zawiesiny, która zostanie wyniesiona na powierzchnię wraz z płuczką wiertniczą. Urządzenia tego typu wyposażone są w ostrza, które wywołują pożądany efekt hydrodynamiczny w trakcie obrotu przewodu wiertniczego, i w wyniku czego zwierciny zostają podniesione z miejsca gromadzenia się. Główne mechanizmy związane z czyszczeniem otworu polegają na wzbiciu osadu, odpowiednich właściwościach reologicznych płuczki wiertniczej oraz hydrauliki.
    Źródło:
    Wiertnictwo, Nafta, Gaz; 2007, 24, 1; 401-413
    1507-0042
    Pojawia się w:
    Wiertnictwo, Nafta, Gaz
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Patterns of drilling predation of cassid gastropods preying on echinoids from the Middle Miocene of Poland
    Autorzy:
    Zlotnik, M
    Ceranka, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/22346.pdf
    Data publikacji:
    2005
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    gastropod
    Miocene
    drilling predation
    drill hole
    cassid gastropod
    Polska
    Cassidae
    Middle Miocene
    echinoid
    predatory behaviour
    paleontology
    Opis:
    Test−drilling predation by cassid gastropods on minute clypeasteroid echinoids has been studied in the fossil assemblage of the Heterostegina Sands (middle Miocene, Holy Cross Mountains, Poland). The analysed prey, collected from two sublithofacies of the Heterostegina Sands (coarse−grained Heterostegina Sands and fine−grained Heterostegina Sands), represent three species of Echinocyamus (E. linearis, E. pusillus and E. pseudopusillus). The drill holes were produced presumably by one cassid species, Semicassis miolaevigata. The investigation showed that drilling predation intensities varied among the prey species. Within both fine− and coarse−grained sands, E. linearis was drilled more frequently than E. pusillus. An intermediate value of drilling predation was recognised for E. pseudopusillus. The intensities of drilling predation recognised for some of the prey species (E. pusillus) varied also between (but never within) the sublithofacies. Drilling predation was both size− and site−selective. Larger individuals of E. linearis and E. pusillus were attacked more frequently and the aboral side of the test of all Echinocyamus species was drilled preferentially. An extremely high concentration of drill holes was observed in the apical disc and petals. Results obtained for the most abundant prey (E. linearis) indicate that the predatory behaviour of large cassids was somewhat different from those typical of small cassids. Large cassids drilled and consumed their prey almost always individually, whereas small cassids sometimes preyed upon the urchins in a group. Large cassids displayed also a higher site−selectivity. They more frequently drilled in the petals and apical disc. The patterns of drilling predation were most likely controlled by the potential energetic value of prey (measured by the internal volume/test thickness ratio), prey and predator mobility, prey mode of life, thickness and porosity of the prey's tests, as well as by the proportions between the size of the prey and size of the predator. The results suggest that the mode of life of the prey and its test structure can influence the drill hole morphology.
    Źródło:
    Acta Palaeontologica Polonica; 2005, 50, 3
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of assembly holes quality after drilling and helical milling of the Al/CFRP stacks
    Porównanie jakości otworów montażowych po wierceniu i frezowaniu spiralnym konstrukcji przekładkowej typu Al/CFRP
    Autorzy:
    Doluk, Elżbieta
    Powiązania:
    https://bibliotekanauki.pl/articles/31232948.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
    Tematy:
    Al/CFRP stacks
    drilling
    helical milling
    hole quality
    konstrukcja przekładkowa Al/CFRP
    wiercenie
    frezowania spiralne
    jakość otworu
    Opis:
    Hybrid sandwich structures composed of aluminium alloys and CFRP (Carbon Fibre Reinforced Polymer) are now frequently used in the aerospace industry. One of the factors inhibiting their application is the difficult processing resulting from the anisotropic nature of this type of construction. These materials are often joined by screws or rivets requiring mounting holes. One of the main problems is ensuring the quality of the holes after machining. The aim of this study is to assess the hole quality (dimensional and shape accuracy) and the occurrence of delamination after machining of a Al 2024/CFRP sandwich structure. In this experiment drilling and helical milling results were compared. A traditional HSS twist drill and a PCD milling cuter with a straight cut were used. The machining was carried out with a variable cutting speed. The tests were performed for two strategy of the machining - Al/CFRP (Al 2024 T3 - Carbon Fibre Reinforced Polymer) and CFRP/Al (Carbon Fibre Reinforced Polymer - Al 2024 T3).
    Hybrydowe konstrukcje przekładkowe składające się ze stopów aluminium i kompozytów epoksydowo-węglowych (CFRP) są obecnie często stosowane w przemyśle lotniczym. Jednym z czynników hamujących ich zastosowanie jest trudna obróbka wynikająca z dużej anizotropowości tego typu materiałów. Konstrukcje te są często łączone za pomocą połączeń śrubowych lub nitowych wymagających otworów montażowych. Jednym z głównych problemów jest zapewnienie jakości otworów po obróbce. Celem artykułu jest ocena jakości otworów (dokładności wymiarowo-kształtowej) oraz występowania delaminacji po obróbce konstrukcji przekładkowej Al 2024/CFRP. W eksperymencie porównano wyniki wiercenia i frezowania spiralnego. Zastosowano tradycyjne wiertło kręte wykonane ze stali szybkotnącej oraz frez węglikowy o prostych zębach pokrytych powłoką diamentową (PKD). Obróbka została przeprowadzona ze zmienną prędkością skrawania. Testy przeprowadzono dla dwóch strategii obróbki - Al/CFRP (stop aluminium/kompozyt epoksydowo-węglowy) i CFRP/Al (kompozyt epoksydowo-węglowy/stop aluminium).
    Źródło:
    Technologia i Automatyzacja Montażu; 2023, 4; 3-12
    2450-8217
    Pojawia się w:
    Technologia i Automatyzacja Montażu
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The technology of drilling wells for capturing methane from abandoned coal mines
    Autorzy:
    Siemek, Jakub
    Macuda, Jan
    Łukańko, Łukasz
    Hendel, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/218949.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wiercenie
    młot udarowy
    metan
    casing-while-drilling
    down-the-hole-hammer
    post-extraction gobs
    methane capturing
    drillability test
    Opis:
    The longwall mining system with fall of the roof is still the most common hard coal extraction system in Polish mining. Its utilization for selective coal seams’ mining results in the development of post-extraction gobs at different depths. Methane desorption phenomena from the coal seams in the stress release zones and migration of gas towards the area of operations, result in methane accumulating also after completion of coal exploitation. Methane which is not exploited from the gobs can migrate directly to the atmosphere e.g. through overlying layers, faults, workings or directly via an operated ventilation grid of an adjacent coal mine – contributing to the Greenhouse Gas effect. One of the methods to capture methane (Abandoned Maine Methane) from abandoned coal mines is to drill vertical wells through several post-extraction gobs from the surface. This paper presents the results of drilling operations at the AGH-Wieczorek-1 well, where first time in Poland, down-the-hole-hammer (DTH) with casing-while-drilling (CwD) technology were used to drill through several post-extraction gobs. The AGH-Wieczorek-1 well with 440.0 m MD was successfully drilled without any complications. Finally, three post-extraction gobs and two coal seams were drilled. Additionally, results from drillability tests, which were performed during drilling operations, are presented.
    Źródło:
    Archives of Mining Sciences; 2020, 65, 1; 89-101
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis Of Drilling Of A Metal Plate With Pilot Hole
    Analiza wiercenia metalowej płyty z otworem pilotującym
    Autorzy:
    Kim, K. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/354541.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    finite element method
    drilling
    pilot hole
    cutting force
    plastic strain
    metoda elementów skończonych
    wiercenie
    otwór pilotujący
    siła cięcia
    odkształcenie plastyczne
    Opis:
    This paper performed a numerical analysis study of the cutting characteristics when drilling a taper hole whose upper and lower diameters are different, that is, a pilot hole. 3-dimensional drilling analysis was performed using a commercial code, and these results were used to determine analytically and compare the cutting temperature, the phenomenon of cutting chip formation, deformation and pressure, etc., for the tools, chips, and specimens during cutting. Also, cutting force and the required energy were calculated and compared. To verify the results of analysis, a cutting dynamometer was used to analyze 3-axis cutting force. Results of analysis showed that the specimen maintained a temperature of approximately 650°, with rapid cooling after chips were formed from the specimen. The tool reached a maximum of 700°, similarly to the chips. It is expected that these results will be utilized to optimize cutting processes and work conditions when drilling holes.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 2B; 1307-1310
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of the Mathematical models of the integral drilling indices based on the Dimensional analysis
    Autorzy:
    Moisyshyn, V.
    Borysevych, B.
    Yytyaz, O.
    Gavryliv, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/299197.pdf
    Data publikacji:
    2014
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    axial static load on the well bottom-hole
    angular speed of the drill bit rotation
    mathematical model
    mechanical drilling speed
    average value of torque on the bit
    energy intensity for the rock destruction process on the well bottom-hole
    stiffness and damping of the drilling tools
    Opis:
    The dimensional analysis method was used to estimate the influence of the axial static load on the bottom-hole, angular speed of the drill bit rotation, stiffness, and damping of the drilling tools on the integral indices of well drilling. The mathematical models of the mechanical drilling speed, average values of torque on the bit, and energy consumption for the rock destruction process on the well bottom-hole were developed for two interlayers of the Vorotyshchenska formation with the hardness of 1440 and 2050 MPa.
    Źródło:
    AGH Drilling, Oil, Gas; 2014, 31, 3; 431-440
    2299-4157
    2300-7052
    Pojawia się w:
    AGH Drilling, Oil, Gas
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-14 z 14

      Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies