Academic literature on the topic 'Tungsten carbide burs'
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Journal articles on the topic "Tungsten carbide burs"
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Lisiecka, Barbara. "The evaluation of wear of tungsten carbide dental bur." Production Engineering Archives 19, no. 19 (June 1, 2018): 6–9. http://dx.doi.org/10.30657/pea.2018.19.02.
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Abstract Due to its durability, tungsten carbide has long been used as a material to produce dental burs. WC– Co burs are designed for smooth, efficient cutting and extended life. Dental burs are available in different sizes and shapes, for example round burs, pear and cylinder-shaped, egg-shaped, as well as there are various tapered ones, which enable an individual selection of the drill for the right treatment. Carbides can be used for standard crowns and bridges, for extensive surgical procedures and they should minimize damage to the existing teeth. The design of WC–Co dental bur reduces a patient’s discomfort because of the operating time and the fact that its liquidity is preserved. The head of the bur (the cutting edge) delivers optimum concentricity and strength. The shank is made from stainless steel allowing a bur to be autoclaved multiple times without the risk of corrosion. The main purpose of this study was to evaluate the wear of a tungsten carbide dental bur. The results of stereoscopy microscope and SEM/EDS analysis are presented.
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Gorucu–Coskuner, Hande, Ezgi Atik, and Tulin Taner. "Tooth color change due to different etching and debonding procedures." Angle Orthodontist 88, no. 6 (August 3, 2018): 779–84. http://dx.doi.org/10.2319/122017-872.1.
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ABSTRACT Objectives: To compare the effects of different etching techniques, 12–, 24–bladed tungsten carbide burs, and polishing discs on tooth color changes during orthodontic treatment. Materials and Methods: 59 individuals (mean age: 15.20 ± 1.59 years) were divided into four groups: 37% phosphoric acid and adhesive primer was used in Groups I and II whereas self–etch primer was used in Groups III and IV for enamel preparation. After orthodontic treatment, residual adhesives were cleaned with 12–bladed tungsten carbide burs in Groups I and III, while 24–bladed tungsten carbide burs were used in Groups II and IV. All teeth were polished with medium and fine Sof–Lex XT discs (3M ESPE, St Paul, Minnesota). Color measurements were taken from upper incisors and canines at pretreatment (T0), after cleaning with tungsten carbide burs (T1) and polishing with discs (T2). Wilcoxon test was used for evaluation of L*, a*, b* changes and Kruskal–Wallis for intergroup comparison of color changes. Results: L*, a*, b* values, except a* at Groups I, II, IV, and b* at Group III, changed significantly (P < .05). Groups III and IV showed significantly different color alterations from T0 to T1 (P < .05). After polishing, tooth color alterations were not significantly different among the groups. Conclusions: In self–etch bonding groups, a 12–bladed tungsten carbide bur caused less color change than the 24–bladed tungsten carbide bur. Orthodontic treatment resulted with visible and clinically unacceptable tooth color alterations regardless of the enamel preparation and clean–up techniques. Polishing reduced the effect of tungsten carbide burs, but did not affect the total influence of orthodontic treatment on the tooth color.
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Petrovic, Renata. "SEM investigation of polishing composite restorations." Serbian Dental Journal 51, no. 1 (2004): 19–23. http://dx.doi.org/10.2298/sgs0401019p.
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Proper finishing and polishing of composite restaurations are procedures that enhance the quality of restorations and reduce plaque accumulation. The purpose of this study was to evaluate with SEM analysis the effect of different polishing methods and instruments of composite surface after polishing. We used different instruments for finishing and polishing: carbide tungsten burs, diamond fissural burs, steel fissural burs, Lo-Flex Pop On discs, Sof-Lex Pop On discs, Hawe rubber cups, gray rubber cups, green rubber cups, polishing strips, polishing pastes. The results we obtained showed that the most efficient polishing of composite restorations was achieved after treatment with Sof-Lex discs, rubber cups and pastes. Treatment with carbide tungsten burs, was the least effective, producing the lowest smoothness of composite surface.
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Noviyanti Putri, Aditya Kartika, Thalca Hamid, and Ari Triwardhani. "Comparison of Tungsten Carbide and Arkansas Stone For Adhesive Removal On Enamel Surface After Debonding Procedure." Indonesian Journal of Dental Medicine 1, no. 1 (March 31, 2018): 59. http://dx.doi.org/10.20473/ijdm.v1i1.2018.59-65.
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Background: Debonding aims to remove orthodontic appliances from the patient's teeth and cleanse all residual adhesive material on the surface of the tooth to restore surface conditions such as before orthodontic treatment. Damage may occur after debonding process. Removal of the remaining adhesive material has a major effect on the enamel surface conditions, the researcher wants to know the effect of cleaning adhesive material using Tungsten carbide 12 flute burs, Arkansas stone bur on the enamel surface Purpose: To determine the effect of cleaning the remaining adhesive material using Tungsten carbide 12 flute burs and Arkansas stone bur Against the Surface of the Enamel. Method: This study was experimental laboratory (in vitro study) with 4 groups division, first control group was tooth before bracket was installed, group 2 was done debonding without cleaning of residual adhesive, group 3 was done adhesive cleansing with Arkansas stone and group 4 was done adhesive cleaning with tungsten carbide 12-flutted Result: Showing that the use of 12-flutted tungsten carbide was able to clean enamel surfaces with the most delicate results and did not cause cracks or cracks on enamel surface Conclusions: The best method to clean the remaining adhesive is using 12-flutted tungsten carbide bur using contra angle high speed and with adequate water flow and sprays to prevent increasing of temperature that damage dental pup.
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Dammaschke, T., T. N. Rodenberg, E. Schäfer, and K. H. R. Ott. "Efficiency of the Polymer Bur SmartPrep Compared with Conventional Tungsten Carbide Bud Bur in Dentin Caries Excavation." Operative Dentistry 31, no. 2 (February 1, 2006): 256–60. http://dx.doi.org/10.2341/05-24.
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Bodrumlu, Emre, İlker Keskiner, Mahmut Sumer, and Nazife Telcioglu. "Temperature variation on root surface with three root-end cavity preparation techniques." Srpski arhiv za celokupno lekarstvo 141, no. 9-10 (2013): 597–601. http://dx.doi.org/10.2298/sarh1310597b.
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Introduction. Thermal changes can occur on the external root surface when root-end cavity preparation is performed, which may damage periodontal ligament cells and alveolar bone. Objective. The purpose of this study was to evaluate the temperature changes during preparation of the root-end cavities at 1 and 3 mm to the sectioned apical root surfaces when either tungsten carbide round bur, diamond round bur or ultrasonic diamond tip was used. Methods. Root-end resection was performed at 90? to the long axis of the root, 3 mm from the apex. Specimens were randomly divided into three groups of 12 teeth each for three different root-end cavity preparation techniques to be used, i.e. tungsten carbide bur, diamond bur and ultrasonic diamond retro tip. Thermocouples were used to measure temperature changes at 1 mm (T1) and 3 mm (T2) to the cutting plane during the preparations. Results. For T1, the lowest and the highest mean temperature increases of 3.53?C and 4.34?C were recorded for the carbide and diamond burs, respectively. For T2, the lowest and the highest mean temperature increases of 2.62?C and 4.39?C where recorded for the carbide and diamond burs, respectively. The mean temperatures with the ultrasonic tip were 3.68 and 3.04 ?C at T1 and T2 region, respectively. For root-end preparation, the ultrasonic preparation technique took the shortest preparation time (10.25 sec) and the diamond bur took the longest time (28.17 sec). Conclusion. Ultrasonic retro tips and burs caused temperature to rise from 2.62? to 4.39?C, and these rises were within safety levels.
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Leão Filho, Jorge César Borges, Ana Karla Souza Braz, Renato Evangelista de Araujo, Orlando Motohiro Tanaka, and Matheus Melo Pithon. "Enamel Quality after Debonding: Evaluation by Optical Coherence Tomography." Brazilian Dental Journal 26, no. 4 (August 2015): 384–89. http://dx.doi.org/10.1590/0103-6440201300406.
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<p>The aims of this study were to evaluate quantitatively the enamel fractures, adhesive remnants and bracket fragments on enamel after debonding of metal and ceramic brackets, and to quantify the layer of adhesive remnants in depth after two different cleanup procedures. Metal and ceramic brackets were bonded on 120 human incisors and then debonded using two different techniques with Side Cutter (SC) and Anterior Bracket Removal plier (ABR). After this, a high-speed tungsten carbide finishing bur or a low-speed tungsten carbide finishing bur was used. The debonded samples were submitted to enamel assessment with optical coherence tomography (OCT). In sequence, two different methods of removing the remaining adhesive (tungsten carbide burs at high and low speed) were performed and at the end of these procedures, the remaining adhesive layer was measured with OCT. The results demonstrated that enamel fractures were observed only in the samples bonded with ceramic brackets, and the type of pliers did not influence the incidence and extent of enamel damage. Moreover, the type of debonding technique (with side-cutting pliers or anterior bracket removal pliers) and the type of bracket did not influence the amount of adhesive remaining after debonding. The burs at low speed removed the remaining adhesive more effectively during cleanup procedures.</p>
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Ahmed, Ayman A., and C. Peter Owen. "A base-line study of the wear of burs used for chairside milling of ceramic crowns of different hardness: effect on internal fit and surface roughness." South African Dental Journal 75, no. 10 (November 1, 2020): 534–40. http://dx.doi.org/10.17159/2519-0105/2020/v75no10a1.
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INTRODUCTION: Wear of milling burs may affect the internal fit and surface roughness of the milled crown. AIM: To assess the wear of diamond and tungsten carbide (TC) burs from milling ceramic materials and the effect on internal fit and surface roughness. METHODS: Thirty crowns of each of the two materials were milled from the same standard preparation. Diamond burs were used for a feldspathic ceramic and TC burs for zirconia. Before and after the 10th, 20th and 30th milling, diamond particle loss was counted and cutting blade changes of the TC burs measured. Internal fit was measured using a silicone replica technique and surface roughness by 3D laser microscope. RESULTS: An average 26% loss of diamond particles occurred after 30 crowns, resulting in a 6% decrease in internal luting space and a 21% decrease in surface roughness. Wear of the TC burs resulted in a 13% decrease in the luting space, and a 16% increase in surface roughness. CONCLUSION: The wear of milling burs reduces the luting space, and the milling parameters must be adjusted to compensate for this. Surface roughness is affected by bur type: with diamond burs it decreased, and increased with TC burs.
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Ahmed, Waqar, Htet Sein, Mark Jackson, and Riccardo Polini. "Chemical vapour deposition of diamond films onto tungsten carbide dental burs." Tribology International 37, no. 11-12 (November 2004): 957–64. http://dx.doi.org/10.1016/j.triboint.2004.07.013.
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Patterson, C. J., A. C. McLundie, and A. M. Mackay. "The effect of ultrasonic cleansing and autoclaving on tungsten carbide burs." British Dental Journal 164, no. 4 (February 1988): 113–15. http://dx.doi.org/10.1038/sj.bdj.4806368.
Full textDissertations / Theses on the topic "Tungsten carbide burs"
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Bunte, Henning. "Der Einfluß der Ausarbeitung mit verschiedenen rotierenden Instrumenten auf die Randqualität und Oberflächenmorphologie von zahnfarbigen lichthärtenden Restaurationen." Doctoral thesis, Humboldt-Universität zu Berlin, Medizinische Fakultät - Universitätsklinikum Charité, 2001. http://dx.doi.org/10.18452/14671.
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In dieser Studie wurde das Verhalten eines neuentwickelten Hartmetallfinierers der Firma Brasseler und herkömmlicher grober und feiner Diamantfinierer der Firmen Intensiv und Brasseler an vier verschiedenen Füllungsmaterialien untersucht. Bei dem Hartmetallfinierer handelt es sich um ein Kombinationsinstrument, das sich im Rechtslauf durch eine hohe Arbeitsleistung auszeichnet und zum Konturieren von Füllungen gedacht ist. Im Linkslauf soll das Instrument zur Feinausarbeitung eingesetzt werden, die Arbeitsleistung ist geringer. In 120 extrahierte menschliche Zähne wurden ovale Klasse-V-Kavitäten (Länge: 4 mm, Breite: 3 mm, Tiefe: 2 mm) präpariert, die jeweils zur Hälfte im Schmelz und Dentin lagen. Jeweils 30 Zähne wurden nach Herstellerangaben mit demselben Füllungsmaterial gefüllt (Prodigy, Silux Plus, Dyract AP, Fuji LC). Anschließend wurden die Restaurationen zunächst mit den gröberen Finierdiamanten und dem Kombifinierer im Rechtslauf konturiert. Jeweils 10 Proben eines jeden Füllungsmaterials wurden mit einem der Instrumente bearbeitet. Auf diese Weise ergaben sich 12 Material-Instrumenten-Kombinationen. Nach dreiwöchiger Wasserlagerung wurde die Rauhigkeit der Füllungsoberflächen mit einem Profilometer gemessen. Außerdem erfolgte eine Auswertung der Randqualität mittels quantitativer Randanalyse. Im Anschluß hieran wurden die Füllungen mit den feineren Diamantinstrumenten bzw. dem Kombifinierer im Linkslauf finiert. Die Füllungen wurden anschließend einer Temperaturwechselbelastung unterzogen (2000 Zyklen zwischen 5°C und 55°C). Erneut erfolgte eine quantitative Randanalyse und eine Oberflächenrauhigkeitsmessung. Die statistische Auswertung der Daten ergab, daß der Kombifinierer im Linkslauf im Gegensatz zu den feinen Diamantfinierern keine Verbesserung der Oberflächenqualität bewirkt. Die Auswirkungen der Instrumente auf die Randqualität ist gleich. Fuji LC weist die höchste Oberflächenrauhigkeit auf. Die übrigen Füllungsmaterialien unterscheiden sich diesbezüglich nicht statistisch signifikant voneinander. Die Silux Plus Restaurationen zeichnen sich durch einen im Vergleich zu den übrigen Materialien hohen Anteil an Randspalten sowohl im Dentin- als auch im Schmelzbereich aus. Die Prodigy Füllungen haben signifikant mehr Randspalten im Dentin als Fuji LC und Dyract AP Füllungen, jedoch auch signifikant weniger als Silux Plus im gleichen Bereich.In this study a newly developed tungsten carbide finishing bur (Brasseler) and conventional coarse and fine grit finishing diamonds of the companies Intensiv and Brasseler were studied with four different filling-materials. The carbide bur is a combination-instrument, that distinguishes itself in the right-hand rotation by a high performance and is intended for the contouring of fillings. When used in a left-hand rotation the instrument should be applied for polishing. In this case the cutting performance is inferior. Oval class-V-cavities (length: 4 mm, width: 3 mm, depth: 2 mm) were prepared into 120 extracted human teeth with one half of the margin length in dentin and one half in enamel. In each case, 30 teeth were filled according to manufacturer-recommendation with the same filling-material (Prodigy, Silux Plus, Dyract AP, Fuji LC). Subsequently the restorations were trimmed with the coarser finishing diamonds and the combination bur with a right-hand rotation. Ten samples of each filling-material were ground with one of the instruments. Thus 12 material-instrument-combinations were established. After three weeks of water-storage, the surface roughness of the fillings was measured with a profilometer. Furthermore, an evaluation of the margin-quality was carried out by means of quantitative margin analysis. After this, the fillings were either polished with the finer diamond-instruments or with the combination-instrument in a left-hand rotation. Afterwards the samples were subjected to a thermocycling procedure (2000 cycles between 5°C and 55°C). Again a quantitative margin analysis and a surface-roughness-measurement were performed. In contrast to the fine diamond instruments, the statistical evaluation of the data revealed that the combination finishing bur does not improve the surface quality in a left-hand rotation. The effect of the instruments on the margin quality is the same. Fuji LC shows the highest surface-roughness, the other filling-materials do not differ statistically significantly from one another. The Silux Plus restorations are characterized by a high percentage of marginal openings in both enamel and dentin. The Prodigy fillings show significantly more marginal gaps in dentin than Fuji LC and Dyract AP fillings, but significantly less than Silux Plus in the same area.
Book chapters on the topic "Tungsten carbide burs"
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Ahmed, Waqar, Htet Sein, Mark J. Jackson, Christopher A. Rego, David A. Phoenix, A. Elhissi, and St John Crean. "Diamond Deposition on Tungsten Carbide Burs Using VFCVD." In Chemical Vapour Deposition of Diamond for Dental Tools and Burs, 97–107. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-00648-2_6.
Full textConference papers on the topic "Tungsten carbide burs"
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Wang, Kai, Jianfei Sun, and Wuyi Chen. "Research on the Parametric Design and Manufacture of Spherical Tungsten Carbide Burs Using a Five-Axis CNC Grinding Machine." In 2016 3rd International Conference on Information Science and Control Engineering (ICISCE). IEEE, 2016. http://dx.doi.org/10.1109/icisce.2016.233.
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Kim, Dave (Dae-Wook), Aaron Beal, and Patrick Kwon. "Effect of Tool Wear on Hole Quality in Drilling of Carbon Fiber Reinforced Plastic-Titanium Stacks Using Tungsten Carbide and PCD Tools." In ASME 2015 International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/msec2015-9364.
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This paper reviews the nature of hole defects and postulates the cause of hole defects resulting from the drilling process of Carbon Fiber Reinforced Plastic (CFRP)-Titanium (Ti) stacked panels using tungsten carbide (WC) and polycrystalline diamond (PCD) twist drills. The parameters that describe the hole quality of the CFRP-Ti stacks include CFRP entry hole delamination, hole diameter and roundness, inner hole surface roughness, CFRP hole profile, CFRP-Ti inter-plate damage, and Ti exit burr. They are caused by heat generation during drilling as well as hot Ti chips and adhesion, Ti burr formation, tool instability, and tool geometry change due to tool wear. For the WC drills, large flank wear and margin wear occurred at the high spindle speed condition, resulting in a reduction of the hole size and an increase of the hole roundness and CFRP-Ti interface damage. At the low spindle speed condition, tool geometry was changed due to the large edge rounding. This resulted in large fiber pull-out at the CFRP hole surface. Ti entry burrs caused damage associated with fiber removal and matrix discoloring at the bottom of the CFRP panel and this inter-plate damage was observed to increase with tool wear. When compared with the WC tool at the same speed condition, the PCD drill maintained relatively small hole defects under all parameters.
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Vargas, Alexandro, Tony Nguyen, and Jiancheng Liu. "Machinability Study on SiC Particle Reinforced Aluminum Alloy Composite (SiCp/Al) Material With CVD Diamond Coated End Mills." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-70115.
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Particle-reinforced metal matrix composites (pMMC) such as silicon carbide particle reinforced aluminum alloys (SiCp/Al) require special cutting tools due to the high hardness and abrasive properties of the ceramic particles. Diamond coated cutting tools are ideal for machining this type of pMMC. Previous research studies focus on the machinability of pMMCs with low ceramic content. The aim of this research is to determine the optimal cutting parameters for machining SiCp/Al material containing high silicon carbide particle reinforcement (>25%). Material removal rate (MRR) was used to determine the optimal cutting parameters with the tool wear and surface roughness as constraints. Cutting speed, feed rate, and depth of cut were used as design parameters for the design of experiment. High burr formation and cutting forces were observed during the experiments. Experimental milling tests are conducted using CVD diamond coated end mills and non-diamond tungsten carbide end mills. It was found that low tool rotation speeds, feed rates and depths of cut are necessary to achieve smoother surface finishes of Ra < 1 μm. A high MRR to low tool wear and surface roughness ratio was obtainable at a tool rotation speed of 6500 r/min, feed rate of 762 mm/min, and depth of cut of 3 mm. Results showed that a smooth surface roughness of the workpiece material was achieved with non-diamond tungsten carbide end mills, however, this was at the expense of extreme tool wear and high burr formation. An endurance test was run to test for complete tool failure.
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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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Dahnel, Aishah Najiah, Helen Ascroft, Stuart Barnes, and Maximilian Gloger. "Analysis of Tool Wear and Hole Quality During Ultrasonic Assisted Drilling (UAD) of Carbon Fibre Composite (CFC) / Titanium Alloy (Ti6Al4V) Stacks." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-50416.
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Carbon Fibre Composite (CFC) and titanium (Ti) alloys have been widely employed in the aerospace industry due to their high strength to weight ratios. For making a military aircraft body, these materials are usually stacked together with titanium alloys serving as the airframe, while CFC is the outer skin. Drilling is often performed in one shot from the CFC outer skin through to the titanium alloy airframe for the purpose of assembling them by mechanical means using rivets, screws, nuts and bolts. Conventional drilling of these CFC/Ti stacks, however, often results in two major issues; rapid tool failure and poor hole quality. This paper considers the potential of employing Ultrasonic Assisted Drilling (UAD) on stack materials in order to improve tool life and hole quality. Experiments comparing conventional drilling and UAD on CFC/Ti6Al4V stack using reground 6.121 mm-diameter TiAlN coated tungsten carbide twist drills are presented. Reground drills were used by way of replicating typical current practice in industry. A constant cutting speed and feed rate of 50 m/min and 0.05 mm/rev, respectively was used in both experiments. During UAD experiments, ultrasonic amplitude and frequency was fixed at 2.6 μm and 42.7 kHz, respectively. A total of 100 holes were drilled in the stacks during each drilling processes (conventional drilling and UAD). Machinability was assessed in terms of thrust forces, tool wear, hole diameter, CFC delamination and titanium burr. Thrust forces were measured using a dynamometer; tool wear was examined using an optical microscope and a Scanning Electron Microscope (SEM); and holes diameter were measured using a bore micrometer. Hole defects; CFC entry delamination was examined and quantified using an optical microscope, while titanium exit burr were investigated using both an optical microscope and a depth gauge. The dominant types of tool wear during drilling of CFC/Ti6Al4V stacks were caused by titanium adhesion/fusion on the cutting edges. In addition, abrasive wear caused by abrading carbon fibres against cutting edges were also observed. Poor hole quality of the stacks included inconsistent diameter of CFC and titanium holes; CFC delamination at the hole entrance and burr formation as the drill exited the titanium. The difference in thrust forces produced by conventional drilling and UAD were minor. It was observed that UAD resulted in less tool wear rate and a reduction of adhered titanium alloy on the cutting edges, more consistent hole diameters and less titanium burr compared to conventional drilling. However, larger CFC delamination was observed during UAD than conventional drilling.