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    Wyświetlanie 1-8 z 8
    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:
    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:
    Size-related changes in predatory behaviour of naticid gastropods from the Middle Miocene Korytnica Clays, Poland
    Autorzy:
    Zlotnik, M
    Powiązania:
    https://bibliotekanauki.pl/articles/22130.pdf
    Data publikacji:
    2001
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Natica tigrina
    gastropod
    Miocene
    drill hole
    shell
    Polska
    Naticidae
    predatory behaviour
    bivalve
    Corbula gibba
    predation
    Middle Miocene
    mollusc
    Hinia restitutiana
    Corbulidae
    Holy Cross Mountains
    paleontology
    paleozoology
    Opis:
    The analysis of shell-drilling predation by naticid gastropods on molluscs from the Korytnica Clays (Middle Miocene, Holy Cross Mountains, Central Poland) has focused on the bivalve Corbula gibba and gastropods Natica tigrina and Hinia restitutiana. The results indicate that predatory behaviour of naticids varies depending on the size of the predator. When drilling corbulids, large naticids displayed higher site-selectivity than smaller naticids. Also, large naticids drilled energetically attractive prey (Hinia restitutiana and Natica tigrina) more frequently than small naticids. Preferential drilling displayed by large naticids from the Korytnica Clays increases the net energy gain for the predator and in result allows it to drill more effectively.
    Przedstawiono analizę rozkładu drążeń Naticidae na muszlach małża Corbula gibba (Olivi, 1792) oraz ślimaków klinia restitutiana (Fontannes, 1879) i Natica tigrina Röding, 1789 pochodzących ze środkowomioceńskich iłów korytnickich. Wykazano, że drapieżnicze zachowania Naticidae były uzależnione od wielkości drapieżcy. Duże Naticidae drążyły głównie w środkowobrzusznym obszarze prawej skorupki C. gibba. Drążenia małych naticidów są zaś na tej skorupce rozmieszczone mniej lub bardziej przypadkowo (patrz Fig. 1A, C oraz porównaj fqLC z fqsc w Tabeli l ). Ponadto, małe Naticidae drążyły na skorupce lewej częściej niż duże (patrz Fig. I A—D oraz porównaj fqLL z fqsL w Tabeli 1). Wielkość drapieżcy miała również wpływ na wybór gatunku ofiary. Duże Naticidae znacznie częściej niż małe atakowały H. restitutiana i N. tigrina (Fig. 2A, B), natomiast małe Naticidae częściej niż duże atakowały C. gibba (patrz Fig. 1A—D oraz porównaj sumę NLR i NLL z NSR i NSL w Tabeli l). Wydaje się, że sposób umiejscawiania drążenia oraz wybór gatunku ofiary dokonywany przez duże ślimaki z iłów korytnickich mogły znacząco wpływać na zwiększenie efektywności polowania — prawa skorupka C. gibba jest bowiem w rejonie środkowobrzusznym najcieńsza. Drapieżnik atakujący ten obszar muszli potrzebował więc mniej czasu na jej przewiercenie. H. restitutiana i N. tigrina stanowiły zaś, ze względu na swoje rozmiary i budowę anatomiczną (duża mięsista noga), potencjalnie obfitsze źródło pożywienia niż C. gibba.
    Źródło:
    Acta Palaeontologica Polonica; 2001, 46, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    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:
    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:
    Applicability of DST results to the evaluation of changes of geologic conditions of Rotliegend series in the Polish Lowland
    Autorzy:
    Dubiel, S.
    Rybicki, Cz.
    Zubrzycki, A.
    Maruta, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/298595.pdf
    Data publikacji:
    2015
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    Rotliegend series
    Aeolian sandstones
    natural gas accumulations
    standard Halliburton drill stem tester
    bottom hole pressure
    rock permeability
    Drill Stem Tester (DST)
    Opis:
    The presented theoretical analysis and industrial examples of interpretation of DST results for the Rotliegend series in the Polish Lowland were focused on the changes of gas productivity factor and commercial value of the analyzed horizon; permeability changes of the Rotliegend series in the wellbore area; facial changes of the Rotliegend.
    Źródło:
    AGH Drilling, Oil, Gas; 2015, 32, 1; 77-88
    2299-4157
    2300-7052
    Pojawia się w:
    AGH Drilling, Oil, Gas
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of the non-project operating modes of the gas pipeline transportation system
    Autorzy:
    Volynskyy, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/298860.pdf
    Data publikacji:
    2015
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    Rotliegend series
    Aeolian sandstones
    Drill Stem Tester (DST)
    natural gas accumulations
    standard Halliburton drill stem tester
    bottom hole pressure
    rock permeability
    Opis:
    The paper refers to the investigation of various non-project operating modes that can occur during the operation of the gas pipeline transmission system. The only method of research is mathematical modeling since the study of accidents and emergency situations in real pipeline is unacceptable. Therefore, in order to carry out the set tasks, mathematical modeling and computer simulation of the gas pipeline system and processes that can cause accidents in its work were applied. As an object of study area was taken a hypothetical gas pipeline transportation system with the possibility to research its unsteady processes arising from the sudden closing of valves, emergency gas leak, the appearance of illegal gas extraction, connecting or disconnecting of looping etc. A mathematical model of the system is based on the classical equations of unsteady gas flow, continuity and energy together with the equation of state of a real gas, which form a closed system. Boundary value problem is selected according to the operating conditions. The obtained results allow us to generalize the findings of a significant impact of location of a gas leak or its extraction for the period of its discovery and the rate of change of the gas flow mode in the pipeline.
    Źródło:
    AGH Drilling, Oil, Gas; 2015, 32, 2; 335-343
    2299-4157
    2300-7052
    Pojawia się w:
    AGH Drilling, Oil, Gas
    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 1-8 z 8

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