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    Wyświetlanie 1-5 z 5
    Tytuł:
    Influence of cutting angle on mechanical properties of rock cutting by conical pick based on finite element analysis
    Autorzy:
    Qiao, S.
    Zhang, Z. Q.
    Zhu, Z. M.
    Zhang, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2016448.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
    Tematy:
    conical pick
    energy consumption ratio
    cutting angle
    computer simulation
    Opis:
    In view of the current situation that it is difficult to obtain the actual cutting force received by the conical pick of Continuous-Miner and to deal with the characteristics of the cutting force. By using contact dynamics, rock mechanics, and finite element methods, based on the display dynamics analysis program ANSYS/LS-DYNA and the Holmquist–Johnson–Cook model, the contact mechanical characteristics between conical pick and rock are analyzed. The resultant force was obtained by obtaining the force curve of the conical pick under X, Y and Z directions, analysis of cutting gear cutting speed of 2.5 m/s, cutting depth of 5, 10, 15, 20 and 25 mm, cutting angle of 30°, 35°, 40°, 45°, 50° parameters of the size of cutting force and cutting ratio energy consumption, thus, the best cutting angle of the conical pick is obtained. The conclusions are as follows: when the cutting depth and cutting speed are constant, and the cutting angle is 45°, the mean cutting force received by the conical pick is the least, the specific energy consumption is the least, and the cutting efficiency is the highest. The best cutting angle of the conical pick should be 45°; When the cutting angle and cutting speed are constant, the energy needed by the cutter to cut the rock increases with the increase of cutting depth. The research results provide a theoretical basis for improving cutting efficiency and cutting life, and for choosing cutting angle and cutting thickness.
    Źródło:
    Mining Science; 2021, 28; 161-173
    2300-9586
    2353-5423
    Pojawia się w:
    Mining Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Conical Picks for Undeground Mining
    Autorzy:
    Bołoz, Łukasz
    Powiązania:
    https://bibliotekanauki.pl/articles/2064288.pdf
    Data publikacji:
    2020
    Wydawca:
    STE GROUP
    Tematy:
    conical picks
    durability of tools
    bearing-equipped pick
    bearing-equipped holder
    innovative solutions
    trwałość narzędzi
    innowacyjne rozwiązania
    ostrze stożkowe
    Opis:
    Mechanical cutting in underground mining faces increasingly difficult challenges. Deteriorating working conditions result in the development of automation and robotization, and the insufficient durability of cutting tools remains a serious problem. In addition to drilling, the technology of cutting provides a huge market for tools. Currently, mainly conical picks are used in the process of cutting. The cutterheads of shearers are equipped with at least several dozen conical picks, which, due to their workability and abrasiveness, sometimes work for merely a few hours. Hence the interest of users and manufacturers in the development of tools with increased durability. The article briefly presents the applied solutions of conical picks, their construction, dimensions and materials used. Attention was paid to the issues related to the protection applied and its marking. A review and analysis of commonly known construction solutions for picks and holders have also been carried out, and proprietary patent pending solutions for the pick and holder have been presented.
    Źródło:
    New Trends in Production Engineering; 2020, 3, 1; 221--230
    2545-2843
    Pojawia się w:
    New Trends in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Conical Pick Production Process
    Autorzy:
    Bołoz, Łukasz
    Kalukiewicz, Antoni
    Galecki, Greg
    Romanyshyn, Liubomyr
    Romanyshyn, Tara
    Barrionuevo-Giménez, Rafael
    Powiązania:
    https://bibliotekanauki.pl/articles/2064284.pdf
    Data publikacji:
    2020
    Wydawca:
    STE GROUP
    Tematy:
    conical picks
    cutting
    production of picks
    pick turning
    die forging
    ostrze stożkowe
    cięcie
    kucie matrycowe
    narzędzia górnicze
    technologia tłoczenia
    Opis:
    One of the basic methods of mechanical rock mining is cutting, which faces increasingly difficult working conditions. Despite the rapid development of machines used in underground and opencast mining as well as in tunnel building, construction industry and road engineering, the problem of insufficient durability of mining tools remains unsolved. In addition to drilling and, to a lesser extent, planing, cutting provides a huge market for tools. Currently, the process of cutting is mainly based on conical picks. The cutterheads of cutting machines are equipped with several dozen, and frequently – more than one hundred conical picks, which, due to their workability and abrasiveness, sometimes work only a few hours. There is a market demand for over two hundred models of conical picks. This is due to the huge variety of shapes and sizes of picks as well as the methods of their mounting in the holder. The article briefly presents various solutions of conical picks, their construction, methods of protection, dimensions and materials used. Next, based on materials produced by ZWM Carbonex, the classic method of their manufacture using the turning technology has been described. The authors have also presented briefly the use of die forging for the large-scale production of picks, applied by Górnicza Fabryka Narzędzi Sp. z o.o.
    Źródło:
    New Trends in Production Engineering; 2020, 3, 1; 231--240
    2545-2843
    Pojawia się w:
    New Trends in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sposoby zwiększania trwałości noży styczno-obrotowych
    Methods to increase conical picks’ durability
    Autorzy:
    Bołoz, Łukasz
    Powiązania:
    https://bibliotekanauki.pl/articles/165801.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Górnictwa
    Tematy:
    noże styczno-obrotowe
    trwałość narzędzi
    szybkość zużycia narzędzi
    nóż łożyskowany
    innowacyjne rozwiązania
    conical picks
    durability of tools
    tool wear rate
    pick equipped with a bearing
    innovative solutions
    Opis:
    Noże styczno-obrotowe są to narzędzia skrawające stosowane w wielu branżach, zwłaszcza górniczej, drogowej i budowlanej. Kontakt z urabianą calizną powoduje ich ciągłe zużycie. W artykule omówiono rozwiązania konstrukcyjne noży styczno-obrotowych, ich budowę, wymiary oraz stosowane materiały. Opisano zabiegi techniczne stosowane w celu zwiększenie ich trwałości, jak również regeneracji. Omówiono również autorskie, objęte zgłoszeniem o patent na wynalazek, sposoby wydłużenia czasu pracy noży w trudnych warunkach. Pierwsze z tych rozwiązań dotyczy zapewnienia niezakłóconego ruchu obrotowego noża w uchwycie. Zastrzeżenia patentowe obejmują nowatorskie łożyskowanie obrotowe dodatkowej tulei zintegrowanej z uchwytem, która umożliwia ciągły obrót noża. Uchwyt przeznaczony jest do mocowania klasycznych noży handlowych. Wymiana noża odbywa się bez ingerencji w węzeł łożyskowy. Drugie rozwiązanie dotyczy sposobu zabezpieczenia części roboczej noża za pomocą specjalnego elementu z materiału trudnościeralnego. Element ten stanowi ostrze noża o geometrii odbiegającej od standardowo stosowanych słupków z węglików spiekanych. W rozwiązaniu tym ostrze ma kształt odpowiadający formie zużycia noża styczno-obrotowego, przez co jego stalowy korpus nie zużywa się.
    Conical picks are cutting tools used in many branches, in particular in the mining, road construction and building branch. Contact with the excavated face causes their constant wear, which is an unfavourable but unavoidable process. In the article various solutions of conical picks, their construction, dimensions and materials used have been discussed. Technical procedures applied to increase the durability of conical picks and their regeneration as well as methods of extending the life of picks working in difficult conditions have been presented. Two author’s methods of extending the life of picks working in difficult conditions, covered by a patent application, have also been presented. The first solution involves ensuring an uninterrupted rotational movement of the pick in the holder. Patent claims include an innovative method of equipping the additional sleeve integrated with the holder with a rotational bearing, which enables a continuous rotation of the commercial pick. The pick replacement does not require interfering with the bearing assembly. The second solution concerns the manner of protecting the working part of the pick by means of a special element made of an abrasion resisting material. This element is the pick tip, the geometry of which varies from the commonly applied posts made of sintered carbide. In this solution, the tip has a shape corresponding to the form of conical pick’s wear, which causes that its steel body does not wear.
    Źródło:
    Przegląd Górniczy; 2019, 75, 9; 28-34
    0033-216X
    Pojawia się w:
    Przegląd Górniczy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Directions for increasing conical picks’ durability
    Autorzy:
    Bołoz, Łukasz
    Powiązania:
    https://bibliotekanauki.pl/articles/2064384.pdf
    Data publikacji:
    2019
    Wydawca:
    STE GROUP
    Tematy:
    conical picks
    durability of tools
    tool wear rate
    pick equipped with a bearing
    innovative solutions
    noże styczno-obrotowe
    trwałość narzędzi
    szybkość zużycia narzędzi
    nóż łożyskowany
    innowacyjne rozwiązania
    Opis:
    Conical picks are cutting tools used in many branches, in particular in the mining, road construction and building branch. Contact with the excavated face causes their constant wear, which is an unfavorable but unavoidable process. Milling heads of working machines are equipped with several dozen conical picks, and mining in abrasive or hardly accessible rocks can reduce their life to a few hours. It is in the interest of both users and producers to increase their durability, as tools replacement, apart from purchase and logistic costs, results in machine downtimes. In the article various solutions of conical picks, their construction, dimensions and materials used have been discussed. Technical procedures applied to increase the durability of conical picks and their regeneration as well as methods of extending the life of picks working in difficult conditions have been presented. Two author’s methods of extending the life of picks working in difficult conditions, covered by a patent application, have also been presented. The first solution involves ensuring an uninterrupted rotational movement of the pick in the holder. Patent claims include an innovative method of equipping the additional sleeve integrated with the holder with a rotational bearing, which enables a continuous rotation of the pick. The tool equipped with a bearing generates much lower movement resistance than the standard mounting. The holder is designed to mount classic commercial picks. What is important, the pick replacement does not require interfering with the bearing assembly. The second solution concerns the manner of protecting the working part of the pick by means of a special element made of an abrasion resisting material. This element is the pick tip, the geometry of which varies from the commonly applied posts made of sintered carbide. In this solution, the tip has a shape corresponding to the form of conical pick’s wear, which causes that its steel body does not wear. Moreover, there is a possibility of applying a mobile, rotational mounting of the tip to the body.
    Źródło:
    New Trends in Production Engineering; 2019, 2, 1; 277--286
    2545-2843
    Pojawia się w:
    New Trends in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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