Relevant bibliographies by topics / Tungsten bit

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Tungsten bit'

Author: Grafiati
Published: 4 June 2025
Last updated: 23 June 2025

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Journal articles on the topic "Tungsten bit"

1

Dwi, Arnoldi. "PENGELASAN TUNGSTEN BIT PADA DRILL BIT DENGAN MENGGUNAKAN LAS ASETILIN." AUSTENIT 2, no. 2 (2010): 26–32. https://doi.org/10.5281/zenodo.4544128.

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Berdasarkan definisi dari Dutche industrie Normen (DIN) Las adalah ikatan metalurgi pada sambungan logam atau logam paduan yang dilaksanakan dalam keadaan lumer atau cair. Dari defenisi tersebut dapat di jabarkan bahwa las adalah sambungan setempat dari beberapa batang logam dengan menggunakan energi panas. Menurut jenisnya pengelasan dibagi dua macam yaitu pengelasan listrik dan pengelasan gas. Prinsip kedua pengelasan tersebut pada dasarnya sama, yaitu dengan prinsip pencairan logam. Akan tetapi pada las gas menggunakan panas yang dihasilkan dari nyala api hasil pembakaran bahan bakar gas dengan zat asam atau oksigen sebagai energinya. Pada pengelasan drill bit menggunakan las oxy- asetylin akan lebih baik dan sempurna apabila memakai kawat las yaitu tungsten bit. Bahan yang digunakan dalam proses pengelasan tungsten bit pada drill bit dengan menggunakan las asetelin adalah: Drill bit yang akan di perbaiki, Kawat las yang digunakan Tungsten bit, Kawat las kuningan, Burax. Pengelasan tungsten bit pada drill bit dengan asetelin adalah proses perbaikan mata drill bit dengan pencairan keduanya sehingga terbentuk kembali.
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Zhang, Li Gang, Tie Yan, and Shi Bin Li. "Design of High-Efficient Bits for Igneous Rock in Xushen Gasfield." Applied Mechanics and Materials 385-386 (August 2013): 308–11. http://dx.doi.org/10.4028/www.scientific.net/amm.385-386.308.

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The igneous rocks in deep formations of the Xushen gasfield have the following characters: high abrasive property, high hardness, and high drillability, which lead to many drill bit accidents, few footage per bit , low efficiency of drilling, long drilling cycle, these severely restrict the exploration and development process of gas field. According to the features of deep formation, a hybird cutters bit is designed. It has three cones, with the overhang cone , duplicate taper and offset cone characters. The tungsten carbide cutters and the polycrystalline diamond compacts cutters are alternative collocation in the same tooth row in the bit. The exposed height of the tungsten carbide cutters is higher than polycrystalline diamond compacts cutters. The back rake angle of polycrystalline diamond compacts cutters is 10 ~ 40 °, the side rake angle is 10 ~ 30 °. The normal direction of working face stay the same with the composite slip direction, and the side rake pointed at adjacent gullet. Through the design method, it is integrated that the advantages of roller bit and PDC bit, the way of impact breakage and rotational shear breakage and the prominent performance of tungsten carbide cutters and polycrystalline diamond compacts cutters. It can improveROP and bit life.
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Peng, J. L., Long Chen Duan, Hao Shi, and Shao Lin Xu. "Study on Bit Body Materials Made of Tungsten Carbide and Steel Shot." Key Engineering Materials 487 (July 2011): 381–85. http://dx.doi.org/10.4028/www.scientific.net/kem.487.381.

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This paper introduces a new kind of diamond bit body material. The characteristics of this material are as follows: the outer bit body cast with tungsten-carbide and the inside is steel shot. So the bit body has got high wear resistance on the outside and good mechanical properties inside at the same time. The mechanical properties inside and the wear resistance outside of the bit were tested. The paper also introduces how to apply a film of mixture of glue-included tungsten-carbide on the surface of the bit mold and graphite stick. The improvements of mechanical properties inside and maintenance of wear resistance outside have made much choice to design wider and deeper junk slots. Thus the performance of bit has been improved.
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Kozhevnikov, A. "Tungsten Carbide Core Drill Bit STK." Nauka ta innovacii 2, no. 3 (2006): 98–100. http://dx.doi.org/10.15407/scin2.03.098.

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Toshov, Javokhir, Doniyor Fozilov, Kassym Yelemessov, et al. "Increasing the durability of drill bit teeth by changing its manufacturing technology." Metal Working and Material Science 26, no. 4 (2024): 112–24. https://doi.org/10.17212/1994-6309-2024-26.4-112-124.

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Introduction. The development of the mining industry requires increasing the durability and safe tool performance life. For bits of mining drilling machines, this problem is often solved by improving the material of the teeth of these bits. The paper presents the results of a study on the development of a technology for the manufacture of hard-alloy drill bits with increased wear resistance and testing of prototypes when drilling hard rocks. Changes in technology have led to changes in the shape of the tooth. Also, purer tungsten powder was used as the initial component. Research methods. The paper studies carbide teeth of bits manufactured at JSC Almalyk Mining and Metallurgical Combine using standard and modified technology. Its structure and chemical composition were studied. Results and discussion. New methods for performing technological operations for the manufacture of carbide teeth (pins) and steel pin bits are developed and mastered. Tungsten-cobalt teeth were manufactured using VK10KS (90 %W; 10 % Co) hard alloy, produced using tungsten carbide powder synthesized by carbidization of purified tungsten powder. The shape of the tooth surface was changed from ballistic to semi-ballistic. Metallic cobalt powder was used as a binder. Pin bits of the KNSh40×25 type are made of 0.35 C-Cr-Mn-Si steel. Tests of experimental bits were carried out at several mines, as a result of which its suitability for drilling rocks with a hardness of f` = 14–18 was established. The results of industrial operation showed that the durability of the teeth of bits manufactured by JSC Almalyk Mining and Metallurgical Combine is not significantly inferior to bits from European manufacturers. At the same time, the cost of such bits is several times lower.
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Boldyreva, A. S. "MATERIAL FOR APPLYING A WEAR-RESISTANT COATING OF THE DIAMOND BIT BODY BY DETONATION METHOD." Izvestiya of Samara Scientific Center of the Russian Academy of Sciences 25, no. 4(2) (2023): 233–37. http://dx.doi.org/10.37313/1990-5378-2023-25-4(2)-233-237.

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This article discusses carbide tungsten carbide materials for detonation coating of the diamond bit body. Various properties of these materials with their different composition are considered. Based on the above analysis, taking into account the most important characteristics (adhesion of the sprayed material to the surface of the bit body, microhardness and wear of the carbide coating) the material most suitable for surfacing the body of a six-blade PDC chisel has been selected. The coupling of the selected carbide material (VK 12) with the surface of the bit body during detonation spraying with the required coating thickness of 200 microns is presented.
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Saeedi, R., and MH Sadeghi. "Investigation of insert-hole interference fit influence on downhole drilling bit failure." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 234, no. 14 (2020): 1752–61. http://dx.doi.org/10.1177/0954405420927831.

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Down-the-hole drilling is a reliable method for drilling in medium-to-hard geological structures. The insert-hole fitting interference value emerges as one of the most important factors of down-the-hole drilling bit life. In this study, fatigue tests were conducted using a tungsten carbide pin press-fitted into a hole in the specimens of DIN 1.6580 steel (which is used for manufacturing the bit body) to quantify the effect of interference value on the bit body failure. Then, the process of bit-rock collision was simulated using three-dimensional finite element method taking into account the residual stresses in the insert and bit body to determine the optimal interference value. Simulations were performed considering the rotary motion of the bit in addition to impact for a single-insert as well as a commercial 3.5 inch bit. Results showed that the interference value influences fatigue life significantly. Also, the velocity and angle of impact have considerable influence on body stresses. Results of this study can greatly assist the design of insert-hole manufacturing tolerances in down-the-hole bits.
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Lee, Juyoung, Dong-Gwan Yoon, Jae-Min Sim, and Yun-Heub Song. "Impact of Residual Stress on a Polysilicon Channel in Scaled 3D NAND Flash Memory." Electronics 10, no. 21 (2021): 2632. http://dx.doi.org/10.3390/electronics10212632.

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The effects of residual stress on a tungsten gate in a polysilicon channel in scaled 3D NAND flash memories were investigated using a technology computer-aided design simulation. The NAND strings, with respect to the distance from the tungsten slit, were also analyzed. The scaling of the spacer thickness and hole diameter induced compressive stress on the polysilicon channel. Moreover, the residual stress of polysilicon channel in the string near the tungsten slit had greater compressive stress than the string farther away. The increase in compressive stress in the polysilicon channel degraded the Bit-Line current (Ion) due to stress-induced electron mobility deterioration. Moreover, a threshold voltage shift (∆Vth) occurred in the negative direction due to conduction band lowering.
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Xu, Liang, Yi Bo Liu, and Qiang Xu. "Segment Matrix Design and Drilling Test of Diamond Bit for Sapphire." Materials Science Forum 1018 (January 2021): 177–82. http://dx.doi.org/10.4028/www.scientific.net/msf.1018.177.

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This paper introduces the characteristics of sapphire and sapphire digging bits in LED field. The segment matrix design principle of bit and the rule of diamond selection are put forward. In addition, this paper analyzes the function of different metal powders and diamond parameters in the segment matrix. The results show that the finer grained (for example 80/100 mesh) diamond should be used with the concentrations of 30-60%. In the segment matrix, tin element can make the matrix more brittle and then the bit is sharper. Copper, silver and nickel element can enhance the matrix toughness and strength, cobalt and tungsten element can increase abrasive resistance. All of the above designs enable the sapphire bit to high sharpness and long life. A 4-inch sapphire bit was prepared for drilling sapphire crystal, the efficiency is increased by 8% than the Taiwan drill bit with the same specifications, the life is equal to Taiwan's drill bit, and the defect rate of sapphire bar is less than 0.5%, which satisfies the requirement of customers.
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Shankar, Vijay Kumar, Bijay Mihir Kunar, Chivukula Suryanarayana Murthy, and M. R. Ramesh. "Measurement of bit-rock interface temperature and wear rate of the tungsten carbide drill bit during rotary drilling." Friction 8, no. 6 (2020): 1073–82. http://dx.doi.org/10.1007/s40544-019-0330-2.

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Dissertations / Theses on the topic "Tungsten bit"

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Holmberg, Anders. "Wear and degradation of rock drill buttons with alternative binder phase in granite and sandstone." Thesis, Uppsala universitet, Tillämpad materialvetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-312141.

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In this thesis, drill bit buttons with cobalt, nickel and iron binders in different compositions have been tested against granite and sandstone and the wear and friction have been measured. Furthermore, the wear and degradation of the buttons have been categorized. Buttons with cobalt binder were tested against granite and sandstone and buttons with alternative binders (Ni, Fe, Co) were tested against granite. Cobalt buttons were used as a reference and the wear and friction of the alternative binders was compared to the reference. The amount of worn rock was also measured. Furthermore, post treated drill bit buttons with a composition of Fe-Ni-Co were compared to buttons with the same composition that had not been post treated The results show that buttons with an alternative composition of Fe-Co-Ni and Fe- Ni wears less than the cobalt reference. The post treatment process does not decrease the wear of the drill bit but lowers the deviation from the mean wear. The amount of worn rock does not differ between the samples except for between the post treated and not post treated buttons with a composition of Fe-Ni-Co. The post treated buttons produces more rock debris than the not post treated. No apparent difference could be seen on the surface of the tested buttons after the test. However, composition specific cracks could be found underneath the surface of the samples. EDS-analysis showed signals of oxygen inside of all of the investigated cracks. For some compositions at depths of 20 micrometers. The curves of friction shows similar appearance but the values of the coefficient of friction differs. No apparent correlation was found between the wear and friction of the samples. Furthermore, no apparent correlation was found between the hardness and the wear of the buttons.
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Marou, Alzouma Ousseini. "Durabilité tribologique de matériaux pour insert de dents de tunnelier." Thesis, Ecully, Ecole centrale de Lyon, 2015. http://www.theses.fr/2015ECDL0042.

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La fréquence des opérations de maintenance lors de l’excavation du sol par les tunneliers est problématique pour les entreprises de travaux publics. Ces opérations de maintenance engendrent des temps morts onéreux et nécessitent l'intervention d'opérateurs dans des conditions de travail hyperbares. Une des raisons aux nombreuses interventions humaines pour la maintenance est l’endommagement des outils racleurs du sol excavé (dents) qui sont placés sur la tête du tunnelier. Ces outils sont sujets à l’usure compte tenu de l’abrasivité des différents milieux qu’ils rencontrent. Le but de cette thèse est de contribuer à augmenter d’au moins 20% la durée de vie des matériaux constitutifs de ces outils, afin de réduire les différentes opérations de maintenance qui exposent les opérateurs à des risques importants. Pour atteindre cet objectif, les investigations menées dans ce travail ont porté sur plusieurs axes. Dans un premier temps, une expertise est menée pour identifier les modes d’endommagement prédominants sur les inserts à base de carbure de tungstène placés sur les dents ; ensuite, de nouveaux matériaux avec des propriétés mécaniques et des microstructures optimisées, développés dans le cadre du projet européen NeTTUN, sont caractérisés sur des bancs d’essais représentatifs. Ces essais ont permis de bien comprendre les mécanismes d’usure des nouveaux matériaux à base de carbure de tungstène. Les résultats de ce travail peuvent ensuite donner lieu à de nouvelles orientations en matière de choix de matériaux pour renforcer les dents de tunnelier<br>The frequency of maintenance operations during the excavation of the ground by the tunnel boring machines (TBM) is problematic for civil engineering companies. These maintenance operations provoke expensive timeouts and they bring in excavation operators in risky hyperbaric work conditions. One of the reasons which leads to the numerous human interventions for the maintenance is the damage of drag bits located on the cutting wheel of the TBM. These drag bits undergo wear due to the abrasiveness of the various media they meet. The purpose of this thesis is to contribute to increase by 20 % at least the lifetime of the materials of the dag bits, in order to reduce the various maintenance operations which expose the operators to important risks. To achieve this goal, the investigations led in this work concerned several axes. At first, an expertise is led to identify the wear modes prevailing on the carbide inserts located on the drag bits; then, new materials with enhanced mechanical properties and optimized microstructures, developed in the framework of the European project NeTTUN, are characterized on representative lab testing devices. These tests allowed us to understand well the wear mechanisms of the newly developed grades of tungsten carbides. The results of this work can lead to new strategies for the selection of materials to reinforce the drag bits
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Корнута, В. А. "Удосконалення конструкції шарошок та озброєння бурових доліт з урахуванням їх напруженого стану". Thesis, Івано-Франківський національний технічний університет нафти і газу, 2011. http://elar.nung.edu.ua/handle/123456789/1939.

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Дисертацію присвячено вирішенню науково-прикладного завдання підвищення надійності озброєння бурових шарошкових доліт шляхом удосконалення конструкції закріплення вставних твердосплавних зубців в корпусі шарошки за результатами моделювання напруженого стану з'єднання з натягом. Розглянуто відомі уявлення про роботу з’єднань з натягом. На підставі аналізу результатів досліджень роботи з’єднань з натягом у машинобудуванні та їх порівняння з інформацією про роботу з’єднань “зубець-шарошка” запропоновано нову конструкцію з'єднання “зубець-шарошка”, отримано патент. Набула подальшого розвитку аналітична модель напружено-деформованого стану з’єднання з натягом співвісних багатокомпонентних циліндрів із суцільним внутрішнім циліндром - змінено крайові умови моделі. Поставлено та вирішено задачу оптимізації дво- та трикомпонентного з’єднання з натягом за критерієм максимуму несучої здатності щодо осьової сили. Удосконалено метод оцінки впливу способів складання та геометричних параметрів елементів конструкції з’єднання з натягом “зубець-шарошка” з наближеною до реальної геометрією на напружено-деформований стан деталей з’єднання за допомогою використання числового методу розрахунку параметрів моделі. Розроблено методику інженерного проектування оптимізованих конструкцій.
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Carmichael, Adrian John. "Synthesis of cationic bis(cyclopentadienyl)tungsten(IV) complexes." Thesis, University of Warwick, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245955.

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Dryden, Neil H. "Chemistry of bis(alkyl) nitrosyl and related complexes of molybdenum and tungsten." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/30694.

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The reactions of (ɳ⁵-C₅R₅)M(NO)(CO)₂ (R = H, Me; M = Mo, W) with PCl₅ result in the formation of the corresponding (ɳ⁵-C₅R₅)M(NO)(Cl)₂ products in high isolated yields (85-95%). These products have been fully characterized by conventional analytical and spectroscopic techniques including an X-ray crystallographic study of [ɳ⁵-C₅Me₅)Mo(NO)(Cl)₂]₂. Alkylation of the (ɳ⁵-C₅R₅)W(NO)(Cl)₂ compounds with Grignard reagents results in the formation of the corresponding complexes, (ɳ⁵-C₅R₅)W(NO)(R')₂ (R = H, Me; R' = CH₂CM₃, CH₂CM₂Ph: R = Me; R' = p-C₆H₄Me, Ph). An electrochemical study of (ɳ⁵-C₅H₅)W(NO)(CH₂CMe₃)₂, (ɳ⁵-C₅H₅)W(NO)(CH₂CMe₂Ph)₂, and (ɳ⁵-C₅Me₅)W(NO)(p-C₆H₄Me)₂ shows 2 successive, chemically reversible, one electron reductions in THF for each complex. The complexes (ɳ⁵-C₅R₅)W(NO)(R')₂ (R = H; R' = CH₂CMe₃, CH₂CMe₂Ph: R = Me; R' = CH₂CMe₂Ph,p-C₆H₄Me) react with 1 atm of CO resulting in the formation of the singly inserted products (ɳ⁵-C₅R₅)W(NO){C(O)R'}(R') in good yields, presumably via initial CO coordination. These acyl complexes have been completely characterized by conventional techniques. The IR and NMR spectroscopic properties of these complexes are indicative of an ɳ²-acyl coordination mode for all of the acylalkyl and acylaryl products. Under 6 atm of CO the (ɳ⁵-C₅H₅)W(NO)(R')₂ (R' = CH₂CMe₃, CH₂CM₂Ph) complexes are doubly carbonylated to form the corresponding (ɳ⁵-C₅H₅)W(NO){C(O)R'}₂ products. Furthermore, (ɳ⁵-C₅Me₅)W(NO){C(O)p-C₆H₄Me}(p-C₆H₄Me) reacts to form (ɳ⁵-C₅Me₅)W(NO)(CO){C(O)p-C₆H₄Me}(p-C₆H₄Me) under 6 atm of CO, but there is no evidence for the formation of a bis(acyl) product. A preliminary X-ray crystallographic investigation of (ɳ⁵-C₅H₅)W(NO){C(O)CH₂CMe₂Ph}₂ reveals the presence of one ɳ²-acyl ligand and one ɳ¹acyl ligand. The ¹H and ¹³C{¹H} NMR spectra of the (ɳ⁵-C₅H₅)W(NO){C(O)R'}₂ compounds exhibit signals for only one type of acyl ligand, indicating that the complexes are stereochemically non-rigid in solution through a process which averages the signals for the ɳ¹and ɳ³- acyl ligands. The bis(benzyl) complexes, (ɳ⁵-C₅R₅)M(NO)(CH₂Ar)₂ (R = H, Me; M = Mo, W; Ar = Ph, p-Tol), react with HCl to form (ɳ⁵-C₅R₅)M(NO)( ɳ²-CH₂Ar)(Cl) complexes. These complexes have been reacted with Grignard reagents, R'MgCl, to form the corresponding (ɳ⁵-C₅R₅)M(NO)( ɳ²-CH₂Ar)(R') (R' = CH₂SiMe₃, CH₂CMe₃, p-Tol) products. The benzyl ligand in all of these complexes is coordinated in an ɳ²-fashion, similar to that seen in the solid-state molecular structures of the bis(benzyl) precursors. The coordination mode of the benzyl ligands has been confirmed by solid-state molecular structure determinations of the representative examples (ɳ⁵-C₅Me₅)Mo(NO)(CH₂Ph)(Cl) and (ɳ⁵-C₅Me₅)Mo(NO)(CH₂Ph)(CH₂SiMe₃). The ¹H and ¹³C{¹H} NMR spectroscopic data for all of the complexes are discussed, with focus on the diagnostic characteristics for the ɳ²-benzyl ligand. A possible qualitative interpretation for the symmetric ɳ²-bonding mode in these complexes is presented. The (ɳ⁵-C₅Me₅)M(NO)( ɳ²-CH₂Ph)(Cl) (M = Mo, W) complexes react with AgBF₄ in CH₃CN to form electrophilic complexes of the type [(ɳ⁵-C₅Me₅)M(NO)( ɳ²-CH₂Ph)(NCCH₃)]BF₄. The solid-state molecular structures of these complexes are discussed and contrasted with those found for the neutral ɳ²-benzyl complexes. The reaction of racemic AgO₂CCH(Et)(Ph) with the (ɳ⁵-C₅R₅)M(NO)( ɳ²-CH₂Ph)(Cl) (R = H, Me; M = Mo, W: R = H; M = Mo) compounds forms the corresponding diastereomeric (ɳ⁵-C₅R₅)M(NO)( ɳ¹-CH₂Ph)(O₂CCH(Et)(Ph)) products. The ɳ¹ coordination of the benzyl ligand and bidentate coordination of the carboxylate ligand are established by the IR, ¹H, and ¹³C{¹H} NMR spectroscopic data for these products. A mixture of two diasteromeric products is demonstrated by the ¹H and ¹³C{¹H} NMR spectroscopic data and initial attempts to separate these diastereomers by crystallization are described.<br>Science, Faculty of<br>Chemistry, Department of<br>Graduate
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洪昆權 and Kunquan Hong. "Synthesis of one-dimensional tungsten oxide nanostructures." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2008. http://hub.hku.hk/bib/B39558551.

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Hu, Rong, and 胡蓉. "Synthesis and characterization of tungsten oxide nanostructures." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2008. http://hub.hku.hk/bib/B41508774.

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Whalley, Alexandra L. "The synthesis and characterisation of bis(cyclopentadienyl) molybdenum and tungsten dithiolene complexes." Thesis, University of Nottingham, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.324486.

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Yiu, Wing-ching James, and 姚穎貞. "Synthesis of one-dimensional tungsten oxide nano-structures by thermalevaporation." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2005. http://hub.hku.hk/bib/B32047770.

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Hartmaier, Alexander. "Modeling of crack-tip plasticity in Tungsten single crystals." [S.l. : s.n.], 2000. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB9444852.

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Books on the topic "Tungsten bit"

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Sundae, Laxman S. Investigation of optimum thrust, cutting speed, and water pressure for tungsten carbide and polycrystalline diamond compact roof- bolt drill bits. U.S. Dept. of the Interior, Bureau of Mines, 1995.

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Molybdenum and Tungsten Enzymes: Biochemistry. Royal Society of Chemistry, The, 2016.

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Molybdenum and Tungsten Enzymes: Biochemistry. Royal Society of Chemistry, The, 2016.

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Molybdenum and Tungsten Enzymes: Biochemistry. Royal Society of Chemistry, The, 2016.

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Molybdenum and Tungsten Enzymes: Bioinorganic Chemistry. Royal Society of Chemistry, The, 2016.

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Schulzke, Carola, Russ Hille, and Martin L. Kirk. Molybdenum and Tungsten Enzymes: Complete Set. Royal Society of Chemistry, The, 2016.

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Schulzke, Carola, Russ Hille, and Martin L. Kirk. Molybdenum and Tungsten Enzymes: Bioinorganic Chemistry. Royal Society of Chemistry, The, 2016.

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Molybdenum and Tungsten Enzymes: Bioinorganic Chemistry. Royal Society of Chemistry, The, 2016.

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Molybdenum and Tungsten Enzymes: Spectroscopic and Theoretical Investigations. Royal Society of Chemistry, The, 2016.

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Molybdenum and Tungsten Enzymes: Spectroscopic and Theoretical Investigations. Royal Society of Chemistry, The, 2016.

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Book chapters on the topic "Tungsten bit"

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Hagen, W. R., and A. F. Arendsen. "The bio-inorganic chemistry of tungsten." In Structure and Bonding. Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/3-540-62888-6_6.

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Nielson, A. J., and B. L. Haymore. "Bis(Organoimido) Complexes of Tungsten(VI)." In Inorganic Syntheses. John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470132586.ch58.

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Broomhead, J. A., J. Budge, W. Pienkowski, C. G. Young, T. L. Tonker, and J. L. Templeton. "Tricarbonyl Bis (N, N -Dialkylcarbamodithioate) Tungsten (II)." In Inorganic Syntheses. John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470132562.ch37.

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Pombeiro, A. J. L., R. L. Richards, and B. I. Haymore. "trans -Bis[1,2-Ethanediylbis(Diphenyl- Phosphine)]Bis(Isocyanomethane)Tungsten(0)." In Inorganic Syntheses. John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470132593.ch8.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of bis(pentaphenylcyclopentadienyl)tungsten(III) iodide." In Magnetic Properties of Paramagnetic Compounds, Magnetic Susceptibility Data, Volume 1. Springer Berlin Heidelberg, 2021. http://dx.doi.org/10.1007/978-3-662-62478-4_169.

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Pardasani, R. T., and P. Pardasani. "Molar magnetic moment of bis(pentaphenylcyclopentadienyl)tungsten(II)." In Magnetic Properties of Paramagnetic Compounds, Magnetic Susceptibility Data, Volume 1. Springer Berlin Heidelberg, 2021. http://dx.doi.org/10.1007/978-3-662-62478-4_168.

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Shaver, Alan, Gabriela Marmolejo, James M. Mccall, Thomas B. Rauchfuss, Lenore Koczon, and Scott Simerly. "Bis(Hydrogensulfido) Complexes of Bis(η5 -Cyclopentadienyl) Titanium(IV) and Tungsten(IV)." In Inorganic Syntheses. John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470132586.ch12.

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Pardasani, R. T., and P. Pardasani. "Molar magnetic moment of tetrabromo-[1,2-bis(4-methoxyacetophenoneimine)propane]tungsten(IV)." In Magnetic Properties of Paramagnetic Compounds, Magnetic Susceptibility Data, Volume 1. Springer Berlin Heidelberg, 2021. http://dx.doi.org/10.1007/978-3-662-62478-4_163.

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Pardasani, R. T., and P. Pardasani. "Molar magnetic moment of tetrabromo-[1,2-bis(4-methoxybenzylideneimine)propane]tungsten(IV)." In Magnetic Properties of Paramagnetic Compounds, Magnetic Susceptibility Data, Volume 1. Springer Berlin Heidelberg, 2021. http://dx.doi.org/10.1007/978-3-662-62478-4_166.

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Pardasani, R. T., and P. Pardasani. "Molar magnetic moment of tetrachloro-[1,2-bis(4-methoxyacetophenoneimine)propane]tungsten(IV)." In Magnetic Properties of Paramagnetic Compounds, Magnetic Susceptibility Data, Volume 1. Springer Berlin Heidelberg, 2021. http://dx.doi.org/10.1007/978-3-662-62478-4_158.

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Conference papers on the topic "Tungsten bit"

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Bagchi, Sandeep, Sam Subramanian, Ryan Ross та ін. "Failure Analysis of Tungsten Contact Failure in a 0.13 μm CMOS Process". У ISTFA 2002. ASM International, 2002. http://dx.doi.org/10.31399/asm.cp.istfa2002p0169.

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Abstract For its latest generation of high performance logic applications, Motorola employs a 0.13 µm CMOS technology with shallow trench isolation (STI). The contact dimension and spacing requirements for the dense areas of the circuitry, such as the cache, are quite aggressive. We recently encountered single bit and massive array failures, which were traced to an electrical short between tungsten contacts. We report here the failure analysis, which involved electrical and physical testing techniques.
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Zhang, Y., H. Sogn, M. Cai, and R. Santana. "An Additive Manufacturing Process Enables the 3D-Printed Application of Armors for Drill Bits." In SPE/IADC Middle East Drilling Technology Conference and Exhibition. SPE, 2023. http://dx.doi.org/10.2118/214548-ms.

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Abstract Materials development, mechanical design, cutting structure modelling/simulation, advanced manufacturing process are the key necessities for producing high-quality, superior-performing drill bits. Among all, the bit body materials and manufacturing method are the key limiting factors for geometric design and bit life. Conventionally processed materials used for drill bit bodies, either a metal matrix body (Tungsten carbide particles infiltrated with copper alloy binder) or a steel body with hand-applied hardfacing material, have reached the limit of certain properties. Recently, an Additive Manufacturing (AM) method has gained rapid expansion from prototyping to industrial scale production with the capability of building complicated shapes and competitive properties. This paper presents the innovative work that went into developing the AM powder containing extremely hard tungsten carbide particles and directly printing this matrix composite parts then to be used in manufacturing drill bits for challenging drilling applications. Additionally, other benefits of adopting AM technology include minimized greenhouse gas emission (GHGE); thus, boosting sustainability. Multiple field application cases with polycrystalline diamond compact (PDC) drill bits dressed with AM components are presented to show the performance improvement over conventional counterparts.
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Al-Salah, Fawaz, Saad Al-Mejmed, Atef Abdelhamid, Ali Alnemer, Tahir Gada, and Mehul Pandya. "Hybrid Bit Technology Deployment Yields Breakthrough Drilling Performance & Cost Savings for Operator." In IADC/SPE Asia Pacific Drilling Technology Conference. SPE, 2021. http://dx.doi.org/10.2118/201018-ms.

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Abstract Optimized drilling performance and minimized cost per well are key objectives for operators in the current challenging oil and gas industry. The process of collecting lessons learned and designing new drill bit technologies based on these learnings is critical for optimizing drilling performance and reducing non-productive time (NPT). Southeast Kuwait onshore wells are drilled with conventional drill bit technology such as tungsten carbide insert (TCI) and polycrystalline diamond compact (PDC) bits on rotary or directional-motor bottom hole assemblies (BHA). This paper discusses the analysis that enabled breakthrough-drilling performance of 16-in. hybrid drill bit technology, delivering outstanding results and cost savings for an operator. The non-homogeneous carbonate formation in these onshore wells cause impact damage, limit the drilling efficiency of PDC and TCI bits, and result in a low rate of penetration (ROP) and poor dull conditions. A collaborative technical analysis identified key performance objectives to ensure a step change in section drilling performance. The analysis involved reviewing: Post-run dull conditions Operating parameters Formation compressive strengths Bit design Previous deployments results On Multiple wells, advanced hybrid bit technology and optimized drilling methods achieved outstanding 73-percent improvement in ROP over conventional technologies, saving operator's 3.8 drilling days and more than 27% of drilling costs. The hybrid design completed two consecutive best in class (BIC) wells in southeast Kuwait compared with the typical TCI performance of a single well per bit.
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Bagchi, Sandeep, Valli Arunachalam, Javier Saenz, James Beck, Lupe Duncan, and Jim Conner. "Contact Failure Due to Particulate Defect in a 0.13 µm CMOS Process." In ISTFA 2003. ASM International, 2003. http://dx.doi.org/10.31399/asm.cp.istfa2003p0206.

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Abstract Random single bit failures were encountered in cache areas of Motorola’s 0.13 µm CMOS products under development. Extensive in-line probe data and end-of-line probe data in conjunction with failure analysis indicated the presence of particles at the upper surface of tungsten contacts. This paper describes how TEM based techniques were used to analyze the origin of the defect which in turn enabled process optimization and yield improvement.
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Scott, Dan E., and Marc R. Skeem. "Diamond Enhanced Shear Cutting Elements on Roller Cone Bits." In ASME 2001 Engineering Technology Conference on Energy. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/etce2001-17031.

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Abstract Polycrystalline diamond (PCD) cutters and drag bit designs have been substantially improved since their 1972 introduction, and PCD drill bits now are approaching the rolling cone tungsten carbide insert (TCI) market is terms of revenue size and have surpassed it in terms of economic impact on the drilling industry.1,2 These performance improvements have lead to a significant encroachment into the drill bit market built upon the breakthrough invention of the rolling cone bit by Howard Hughes Sr. Material and design improvements in the last decade, however, have now led to the successful application of patented shear cutting PCD elements as well as conventional diamond enhanced crushing style inserts on rolling cone bits. Diamond enhanced rolling cone bits are also a growth market for diamond elements in drilling. Failing rock in shear is a more efficient process than by crushing, but most cutting materials can not stand up to the forces generated in the shearing process as rock strength increases. To take advantage of the unique ability of the PCD cutter to shear rock efficiently, a concerted R&amp;D effort supported by laboratory and field-testing led to the application of diamond as a shear cutting element on roller cone bits. A variety of rolling cone shear cutting elements have been developed and successfully commercialized in the last decade. This paper will discuss laboratory results and increased field performance achieved relative to conventional crushing style diamond and tungsten carbide inserts. The authors will document through case studies increases in rate of penetration (ROP), footage, overall durability, and gauge holding ability in addition to bearing/seal effectiveness that have further reduced drilling costs and served to increase usage of polycrystalline diamond elements on roller cone bits. These applications range from such diverse markets as high cost offshore North Sea, to low cost North American land operations.
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Alvarez, O., M. Othman, M. Alrowitea, and D. Daksuev. "28in Hybrid Bit Technology Drilling through Complex Offshore Drilling Intervals." In International Petroleum Technology Conference. IPTC, 2025. https://doi.org/10.2523/iptc-25022-ea.

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Abstract This paper explores the successful application of hybrid bit technology in offshore gas well operations. It details the strategic steps taken to meet the primary objectives, utilizing a 28-Inch hybrid bit technology to tackle the complexities of drilling in challenging offshore intervals. Key aims of the bit design and tool deployment encompassed achieving single-trip completion of the section, enhancing drilling speed and efficiency, and driving cost savings in operations. Offshore gas drilling presents significant costs and challenges, particularly in large hole sizes. In this specific scenario, the interval comprises highly interbedded formations and a demanding drilling environment, including fluid loss zones, boulders, and hard, abrasive intercalations. The challenging 28-Inch section spans over 4,000 ft of medium to hard dolomites with occasional streaks of anhydrite and interbedded limestone with shales. The conventional approach to drilling such sections involves using two or three roller cone tungsten carbide bits, leading to high drilling costs and instability issues due to prolonged hole exposure. To address these challenges, multiple wells in the area were meticulously analyzed, examining both time and depth-based logs along with electrical logs. This comprehensive analysis revealed a drilling trend, indicating that hybrid bit cutting structures were best suited for this demanding application. The hybrid bit solution was chosen for its unique capability to shear and crush formations during drilling, combining the durability of roller cone bits with the efficiency of PDC (Polycrystalline Diamond Compact) drill bits. This distinctive drilling mechanism enables hybrid bit technology to efficiently drill through this challenging application compared to traditional drill bits. In the field-testing phase, the hybrid bit was deployed in two consecutive wells. Although the drilling parameters were controlled to prevent total losses, which impacted the overall average rate of penetration (ROP), the outcomes were remarkable. Both wells successfully completed the section using only the hybrid bit, which was pulled out of the hole in good condition. Furthermore, both wells achieved above-average ROP and saved 3 to 4 days of drilling time compared to the conventional method of using standard roller cone bits. The 28-Inch hybrid bit technology has proven to be the ideal solution for addressing the demanding offshore gas drilling challenges in this application. It stands out as the only drill bit technology capable of completing this section in a single trip, thereby facilitating the achievement of all performance targets set for the test.
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Chiu, Re-Long, Hui Zhang, Wen-Szu Chung, Mark Cherng, and Xu Liu. "Beam-Based Localization Techniques for 0.18um IC Failure Analysis After Reliability Test." In ISTFA 2002. ASM International, 2002. http://dx.doi.org/10.31399/asm.cp.istfa2002p0245.

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Abstract Locating the defect site in current devices is complicated by their density and size. Voltage contrast (VC) imaging and backscattered electron (BSE) imaging are non-destructive beam-based location techniques. We can locate the defect to single poly line, contact and via by combining EMMI, LC, layout and bit map address information. Some reliability failure analysis cases are presented to demonstrate the effectiveness of the beam-based techniques. VC imaging and BSE imaging are used to locate the defect site precisely. The subsequent steps include deprocess and precision FIB cut for sample preparation. SEM or TEM is then used to identify failures caused by gate oxide pinhole, contact junction leakage, high butted contact resistance or tungsten residue.
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Lyles, Dustin, Cameron Devers, Warren Dyer, and Shawn Lyles. "Innovative Approach to Maximizing Completion Drill Bit Longevity." In SPE Annual Technical Conference and Exhibition. SPE, 2022. http://dx.doi.org/10.2118/210203-ms.

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Abstract For almost a decade, the predominant completion drill-out bits utilized to drill composite frac plugs were roller-cone (RC) bits incorporating "hybrid" cutting structures. RC hybrid cutting structures consist of various layouts incorporating a combination of milled teeth (MT) and tungsten carbide insert (TCI) cutting elements that exhibit known trade-offs regarding longevity and performance. The objective of this paper is to illustrate how practicing engineers can, and should, question status quo to overcome traditional design/performance limiters. Extensive analysis of hybrid RC dull bits and performance data was conducted with the goal to advance RC completion drill bit longevity and performance while reducing non-productive time (NPT). Through quantifying and classifying cutting structure damage across 30 RC hybrid drill bits, data collected clearly illustrated which portions of the bit profile and cutting elements were sustaining the most damage. The data indicated commonly accepted hybrid RC designs display an inherent weakness that would require questioning common beliefs about completion RC bit design and manufacturing methodologies. A new bit design was developed and extensively field tested. The results of the dull bit evaluation indicated the MT are inherently less robust and result in more performance limiting cutting structure damage. The MT have been utilized as a standard due to industry acceptance, manufacturing limitations associated with implementing the more robust TCI's in all portions of the bit profile and perceived benefits with MT geometry. Implementing full TCI coverage to mitigate cutting structure damage required rethinking longstanding manufacturing methods and cutting element selection that have been accepted as industry standards. Changes in manufacturing methodology required increasing surface hardness of the cone face around TCI's to avoid loss due to interaction with slip debris and/or weakened TCI retention due to erosion. This change required a substantial and challenging shift in heat-treating methods and manufacturing workflow. Further changes were made to the TCI geometries in the new design to ensure the aggressiveness needed to fail soft composite plug materials into small debris sizes was equivalent or better than the MT cutting elements. The manufacturing, material and geometric changes resulted in a solution that contradicted previous trade-off understandings regarding completion drill bits by simultaneously improving durability and aggressiveness. The work exemplifies the importance for practicing engineers continuously to question status quo in pursuit of continuous improvement even when faced with longstanding beliefs and/or methodologies. Furthermore, the findings from the project give insight into completion drill-out trends and opportunities to reduce NPT and improve efficiency.
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Krikor, Ara, Martin Sanderson, Lizeth Merino, et al. "Precise Engineering Design and Technology Integration Delivers the First Successful Shoe to Shoe Run that Enhanced Drilling Efficiency in Highly Intercalated Formations." In SPE/IADC Middle East Drilling Technology Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/202088-ms.

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Abstract Drilling highly intercalated formations with Polycrystalline Diamond Compact (PDC) bits has been a challenge in few Southern Iraqi Fields. The established drilling practice for the 17.5-in section has been a two-run strategy - Top section formation is mostly dolomite intercalated with anhydrite drilled with a Tungsten Carbide Insert (TCI) bit, then trip out of hole to change to a PDC bit and drill to section TD. The upper section comprises highly intercalated formations known to induce severe bit and BHA damage. The application of new Conical Diamond Elements (CDEs) backing up traditional PDC cutters on the bit blades had significantly improved bit durability in the bottom half of the section. The subsequent challenge was to apply this CDE technology onto an optimized PDC chassis and achieve a single run section thus eliminating a trip for bit change as well as improving overall Rate of Penetration (ROP) of the section. A Bit and drill string optimization exercise was initiated by the Technology Integration Center to develop a new PDC bit design that could deliver a shoe-to-shoe section. Analysis of offset well data highlighted the need for greater cutter redundancy on the bit to survive high impact loading and optimized cutter arrangement to minimize bit induced instability while drilling through intercalations with highly fluctuating rock strengths. A finite element analysis (FEA)-based modelling system was used to evaluate the dynamic behavior of multiple bit design configurations in various rock scenarios and narrow down to the optimum design for the challenge. The optimization exercise shortlisted a PDC bit design characterized by 8 Blades, 16-mm PDC cutters and CDEs backing-up the nose and shoulder PDC cutting structure. A detailed drilling parameter road map was also generated to ensure optimum drilling parameter application for shoe-to-shoe assurance. The new bit drilled the entire section in single run with a field record average on-bottom ROP of 20 m/hr which was a 11% improvement over the best offset performance with a two-bit strategy. In addition, a trip for bit change was eliminated. A minimum saving of 20 rig hours was realized thus reducing section time by almost one day compared to the offset wells. The bit was pulled out of hole with minor cutter damage indicative of efficient drilling dynamics and opportunities for further performance enhancement through improved parameter management, alternate drive systems and high torque drill pipes. This paper further will discuss how the technology integration and precise engineering design can solve complicated on bottom drilling problems and address the problematic challenges of drilling highly intercalated formations. This strategy enabled a significant time and cost saving compared to drilling the section conventionally.
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Beal, Aaron, Dave Dae-Wook Kim, Kyung-Hee Park, and Patrick Kwon. "A Comparative Study of Carbide Tools in Drilling of CFRP and CFRP-Ti Stacks." In ASME 2011 International Manufacturing Science and Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/msec2011-50114.

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A comparative study was conducted to investigate drilling of a titanium (Ti) plate stacked on a carbon fiber reinforced plastic panel. The effects on tool wear and hole quality in drilling using micrograin tungsten carbide (WC) tools were analyzed. The experiments were designed to first drill CFRP alone to create 20 holes. Then CFRP-Ti stacks were drilled for the next 20 holes with the same drill bit. This process was repeated until drill failure. The drilling was done with tungsten carbide (WC) twist drills at two different speeds (high and low). The feed rate was kept the same for each test, but differs for each material drilled. A Scanning Electron Microscope (SEM), and a Confocal Laser Scanning Microscope (CLSM), were used for tool wear analysis. Hole size and profile, surface roughness, and Ti burrs were analyzed using a coordinate measuring system, profilometer, and an optical microscope with a digital measuring device. The experimental results indicate that the Ti drilling accelerated WC flank wear while CFRP drilling deteriorated the cutting edge. Entry delamination, hole diameter errors, and surface roughness of the CFRP plate became more pronounced during drilling of CFRP-Ti stacks, when compared with the results from CFRP only drilling. Damage to CFRP holes during CFRP-Ti stack drilling may be caused by Ti chips, Ti adhesion on the tool outer edge, and increased instability as the drill bits wear.
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