Relevant bibliographies by topics / Grinding performance

Academic literature on the topic 'Grinding performance'

Author: Grafiati
Published: 4 June 2021
Last updated: 5 February 2022

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Contents

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

Journal articles on the topic "Grinding performance":

1

Li, Wei, Bin Hu, and Ming Ming Ma. "Grinding Performance of Permeated Grinding Wheel." Advanced Materials Research 189-193 (February 2011): 121–24. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.121.

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The permeated grinding wheel was a new kind of grinding wheel, which was permeated by the chemical additives and solid lubricant into the interior gaps of the grinding wheel. Therefore, the grinding wheel can form a lubrication film on the surface of the grinding wheel. This grinding wheel has some good features, such as lower grinding temperature, smaller grinding force, higher life of the grinding wheel, and can prevent the adhesion of chip onto the grinding wheel surface. The experimental results indicate that the ground surface quality and grinding efficiency have been remarkably improved for more hard-to-cut materials.
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Klocke, Fritz, Sebastian Barth, and Patrick Mattfeld. "High Performance Grinding." Procedia CIRP 46 (2016): 266–71. http://dx.doi.org/10.1016/j.procir.2016.04.067.

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Choi, Young Jae, Kyung Hee Park, Yun Hyuck Hong, Kyeong Tae Kim, Seok Woo Lee, and Hon Jong Choi. "Design of Ultrasonic Horn for Grinding Using Finite Element Method." Advanced Materials Research 565 (September 2012): 135–41. http://dx.doi.org/10.4028/www.scientific.net/amr.565.135.

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In this paper, a ultrasonic horn, which can vibrate longitudinally with a frequency of 20㎑, was designed using finite element method (FEM). And the ultrasonic horn was fabricated for ultrasonic assisted grinding. To evaluate machining performance of the fabricated ultrasonic horn, grinding test was conducted on alumina ceramic (Al2O3). In the grinding test, grinding forces was measured and compared between the conventional grinding and the ultrasonic assisted grinding. The results showed that the grinding force in the ultrasonic grinding was lowered than the conventional grindign by 3~20%.
4

Shen, Xiao Long, Cheng Gao Ren, Zhi Mou Pi, and Dai Li Zhu. "Experimental Investigation and Improvement of Dynamic Performance of High-Speed Grinding Machine." Advanced Materials Research 156-157 (October 2010): 1609–12. http://dx.doi.org/10.4028/www.scientific.net/amr.156-157.1609.

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Design of the dynamic performance of a machine tool is an effective approach to improve the machining accuracy. In this paper, the dynamic performance of high-speed cylindrical grinder has been studied systematically to improve the surface quality of high-speed grinding. According to the mode shape graphs and the power spectra, the vibration weak links and the main vibration sources of the prototype were found, and then the improvement measures were presented by designing the dynamic performance tests. The fact that the chatter of high-speed grinding can be suppressed to a certain extent with variable speed grindings was verified in variable speed grinding experiments at high speed.
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Tsai, Ming Yi, Shi Xing Jian, and J. H. Chiang. "Effect of Novel Grinding Wheels on Grinding Performance." Applied Mechanics and Materials 405-408 (September 2013): 3302–6. http://dx.doi.org/10.4028/www.scientific.net/amm.405-408.3302.

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Grinding, a technique for removing abrasive materials, is a chip-removal process that uses an individual abrasive grain as the cutting tool. Abrasive material removal processes can be very challenging owing to the high power requirements and the resulting high temperatures, especially at the workpiece-wheel interface. This paper presents a novel system that uses graphite particles impregnated in an aluminum oxide matrix to form a grinding wheel. This study specifically investigated grinding wheels with a graphite content of 0.5 wt%. The new grinding wheel was compared with conventional grinding wheels by comparing the factors of grinding performance, such as surface roughness, morphology, wheel wear ratio, grinding temperature, and grinding forces, when the wheels were used under two different coolant strategiesdry and with minimum quantity lubrication (MQL) using pure water. This study found that there is a considerable improvement in the grinding performance using graphite-impregnated grinding wheels over the performance obtained using conventional grinding wheels. The use of 0.5 wt% graphite provided better surface roughness and topography, lower grinding temperature, and decreased force; in addition, wheel consumption was lower, resulting in extended wheel life.
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OHONO, Ryouhei, Nobuhide ITOH, Hitoshi OHMORI, Hirosi KASUGA, and Takasi MATUZAWA. "Development of plating grinding wheel and grinding performance." Proceedings of Yamanashi District Conference 2016 (2016): 309. http://dx.doi.org/10.1299/jsmeyamanashi.2016.309.

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STEPHENSON, David, and Paul COMLEY. "High Performance Superabrasive Grinding." Proceedings of International Conference on Leading Edge Manufacturing in 21st century : LEM21 2007.4 (2007): Keynote. http://dx.doi.org/10.1299/jsmelem.2007.4.keynote.

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Neslušan, Miroslav, Jitka Baďurová, Anna Mičietová, and Maria Čiliková. "Performance of Norton Quantum Grinding Wheels." Key Engineering Materials 686 (February 2016): 125–30. http://dx.doi.org/10.4028/www.scientific.net/kem.686.125.

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This paper deals with cutting ability of progressive Norton Quantum grinding wheel during grinding roll bearing steel 100Cr6 of hardness 61 HRC. Cutting ability of this wheel is compared with conventional grinding wheel and based on measurement of grinding forces as well as surface roughness. Results of experiments show that Norton Quantum grinding wheels are capable of long term grinding cycles at high removal rates without unacceptable occurrence of grinding chatter and surface burn whereas application of conventional wheel can produce excessive vibration and remarkable temper colouring of ground surface. Moreover, while Norton Quantum grinding wheel gives nearly constant grinding forces and surface roughness within ground length at higher removal rates, conventional grinding wheel (as that reported in this study) does not.
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Liu, Ye Feng, Hua Zhang, Huan Huan Zhao, Yu Lin Cai, Jun Yao, and Hai Tao Huang. "An Experimental Investigation of Cooling-Air Grinding Performance." Advanced Materials Research 97-101 (March 2010): 1879–82. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.1879.

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Cooling-air grinding is one of important green grinding technology. Cooling-air grinding performances for 40Cr are tested in this paper using cooling-air generator. Main performance influencing factors are tested and analyzed, such as air temperature, wheel granularity, amount of feed and so on. Cooling-air grinding results showed that roughness of surface of specimen can reach to precise grinding standard. So cooling-air grinding can replace traditional grinding in this experiment. This study for the promotion of cooling-air grinding application technology has important significance for reference.
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MIURA, Takuya, Yongbo WU, Masakazu FUJIMOTO, Mitsuyoshi NOMURA, and Zhiqiang LIANG. "2205 Grinding Performance of Spiral Ultrasonic Assisted Grinding for Monocrystal Sapphire using Vitrified Diamond Wheel." Proceedings of International Conference on Leading Edge Manufacturing in 21st century : LEM21 2015.8 (2015): _2205–1_—_2205–4_. http://dx.doi.org/10.1299/jsmelem.2015.8._2205-1_.

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You might also be interested in the extended bibliographies on the topic 'Grinding performance' for particular source types:
Journal articles Dissertations / Theses

Dissertations / Theses on the topic "Grinding performance":

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Latchireddi, Sanjeeva Rao. "Modelling the performance of grates and pulp lifters in autogenous and semi-autogenous mills /." [St. Lucia, Qld.], 2002. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16387.pdf.

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Pearson, Simon Nathaniel. "America’s Cup sailing: Biomechanics and conditioning for performance in grinding." AUT University, 2009. http://hdl.handle.net/10292/924.

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Grinding is integral to tacking and gybing manoeuvres in America’s Cup sailing. Grinding is a standing position cyclic upper body task requiring manual arm cranking of winches, which control movement of the mast and sails. Limited information exists on biomechanical factors involved in grinding performance. This thesis determined technique and muscular performance characteristics of sailors related to grinding performance, and effects of a training intervention on grinding performance. Reliability of grinding ergometer performance testing was evaluated across direction, load and heel conditions. In all conditions relative performance between individuals was consistent (r = 0.84-0.99) and the grinding performance test differentiated well between individuals. External work had lower overall variation (1.6-3.9%) than peak power (1.3-5.4%), especially when grinding against greater loads. Grinding performance was less consistent in heeled conditions (4.6-6.9%) than on the flat, but grinding direction did not affect reliability. Performance changes over 4% could be interpreted with confidence. Peak torque occurred at 95° (77 N m) and 35° (69 N m) for forward and backward grinding respectively (0° = grinding crank vertically up). Torque of >50 N m was maintained through 72% of the cycle during forward grinding but only 47% for backward grinding. Differences were attributed to a greater spread of active muscles throughout the cycle for forward grinding, and contrasting movements contributing most to torque – upper body push for forward grinding and pull for backward grinding. Variant characteristics of the two grinding directions provide some explanation for the significant advantage (+8.0%, p<0.001) when grinding in pairs with an anterior-posterior heel compared to a medio-lateral heel. Movement characteristics did not readily explain why an anterior-posterior heel may be more advantageous under higher grinding loads (1.0%, p = 0.254), while medio-lateral heel is better at lower loads (2.0%, p = 0.017). Muscular performance of sailors, examined using an instrumented Smith machine, showed force and 1RM strength were greater in the bench press by ~17%. Velocity and power output were greater for the bench pull across the range of loads with the difference increasing exponentially as load increased to over 400% higher at 1RM load. Bench press 1RM and maximum force capability demonstrated strongest correlations with forward grinding performance (r = 0.88-0.99 and 0.87-0.99 respectively) with the relationship increasing with grinding load. There was a strong relationship for backward grinding with bench pull maximum power (r = 0.85-0.98) in addition to 1RM (r = 0.90-0.95) and maximum force (r = 0.87-0.95). Backward grinding performance showed greater improvements in the power-focussed training group than the control group for moderate (+1.8%) and heavy load (+6.0%) grinding in the intervention study. Changes in maximum power output and power at 1RM had large correlations (r = 0.56-0.61) with changes in both moderate and heavy load grinding performance. Time to peak force explained 70% of the change in heavy load grinding performance. Performance benefits from the training intervention were not entirely clear, but the likelihood of a detrimental effect was low (<5%), therefore further training intervention was recommended.
3

Chipakwe, Vitalis. "Comparative Study of Chemical Additives Effects on Dry Grinding Performance." Licentiate thesis, Luleå tekniska universitet, Mineralteknik och metallurgi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-85155.

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The application of chemical additives, known as grinding aids (GA), dates back to 1930 in the cement industry. As opposed to the cement industry, where the use of GAs is on the final processing step, it could be one of the first process steps in ore beneficiation. A few investigations addressed the GA applications in ore dressing; therefore, further studies are required to better understand the GA effects on the product properties and downstream separation processes. This thesis undertakes a comparative study on the dry grinding of magnetite and the resulting product characteristics with and without GAs. The main aim is to reduce energy consumption and to address some of the challenges associated with dry processing.  The effects of GAs on the dry batch ball milling of magnetite were examined to analyze the energy consumption (Ec), particle size distribution, flow properties, bulk properties, surface morphology, particle fineness, and surface chemistry of products. Their effects on the ground product were systematically explored by sieve analysis, powder rheology, BET surface measurements, optical microscopy analysis, and zeta potential measurements. Compared with the absence of GAs, the dry grinding efficiency of magnetite increased after using GAs; however, an optimal dosage exists based on the GA type. Among GAs which considered in this investigation (Zalta™ GR20-587 (Commercial GA) and Zalta™ VM1122 (Commercial viscosity aid) as well as sodium hydroxide), Zalta™ VM1122, a polysaccharide-based additive, was the most effective GA where by using this GA; the Ec decreased by 31.1% from 18.0 to 12.4 kWh/t. The PSD became narrower and finer (P80 decreasing from 181 to 142 µm), and the proportion of the particles (38–150 µm) increased from 52.5 to 58.3%. In general, the results reveal that at sufficient GA dosages, they reduce the average particle size, increase the specific surface area, and narrow the particle size distribution. However, an excessive amount of GAs could be detrimental to the grinding performance.  Further studies on powder rheology indicated that the used GAs resulted in improved material flowability compared to grinding without additives (in the examined dosage range). The rheology measurements by the FT4 Powder Rheometer showed strong linear correlations between basic flow energy, specific energy, and the resulting work index when GAs was considered for grinding. There was a strong correlation between the grinding parameters and flow parameters (r > 0.93). These results confirmed the effect of GA on ground particles' flowability. Zalta™ VM1122 showed the best performance with 38.8% reduction of basic flow energy, 20.4 % reduction of specific energy, 24.6% reduction of aerated basic flow energy, and 38.3% reduction of aerated energy. The present investigation showed that the predominant mechanism of GAs is based on the alteration of rheological properties. Further investigation on the surface properties showed that using GAs could increase the surface roughness, which is beneficial for downstream processes such as froth flotation. Zalta™ VM1122 resulted in increased surface roughness and minimum microstructural defects from the optical microscope images. Furthermore, Zalta™ VM1122 (non-ionic) resulted in similar zeta potentials and pH values for the product compared to experiments without GA. These comparable product properties are advantageous as they minimize any potential negative effects on all possible downstream processes.
Kolarctic CBC (KO1030 SEESIMA)
4

Dzebo, Sead. "Investigation of methods to improve process performance in centerless grinding of Inconel 718 and Ti-6Al-4V superalloys." Thesis, Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/37113.

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Grinding is an abrasive machining process used for the final shaping of components that require very smooth surfaces and a high dimensional accuracy. In recent years, the costs of industrial grinding operations have increased with a greater demand for high-strength, low-weight superalloy components. Titanium and nickel-based alloys are desirable for their high creep-rupture strength and corrosion and oxidation resistance in high-temperature environments. However, they are very difficult to grinding due to a combination of poor thermal properties, rapid work-hardening, and a high level of chemical reactivity. In this thesis, two methods are investigated to improve process performance in plunge centerless grinding of Inconel 718 and Ti-6Al-4V superalloy fasteners: (i) economic optimization of grinding process parameters and (ii) reduced quantity lubrication using a graphite nanoplatelet-enhanced grinding fluid. In the first part, a systematic methodology is presented for finding the optimum parameters in two stages: (i) modeling of process and part quality constraints, and (ii) determination of optimum grinding conditions in the feasible operating region. In the second part, the performance of a graphite nanoplatelet-enhanced grinding fluid in reduced quantity lubrication centerless grinding is evaluated to assess its potential as a cost-effective alternative to the traditional flood cooling method. The results of the study indicate that an appreciable reduction in the cost of the superalloy grinding operation can be achieved by operating at the optimum parameters. In addition, it is shown that the application of a graphite-enhanced fluid at a reduced flow rate is more effective than high-volume flood cooling in reducing specific grinding energy levels and wheel wear rates, thus offering the potential to increase process productivity.
5

Wikedzi, Alphonce Wendelin. "Optimization and performance of grinding circuits: the case of Buzwagi Gold Mine (BGM)." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2018. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-235098.

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Buzwagi Gold Mine (BGM) is operated by Acacia Mining and located in the Lake Victoria Goldfields of central Tanzania. The mine commenced its operation since April 2009 and treats a sulphide copper-gold ore to produce gold in form of doré bars and a concentrate containing gold, copper and silver. The BGM comminution circuit includes a primary crushing stage with a gyratory crusher and a two grinding circuits using a Semi-Autogenous Grinding (SAG) mill and a ball mill. The SAG mill circuit also includes a single-deck screen and a cone crusher while the ball mill circuit utilizes hydrocyclones. Currently, the grinding circuits are inefficient in achieving the aspired product fineness of xP,80 = 125 μm even at low to normal throughputs (450-600 t/h). An evaluation and optimization study of the circuit performance was conducted to improve the product fineness through circuit surveys, experimental lab work and simulations. In three full scale sampling campaigns, size distributions and solids contents of the samples were determined at selected points in the circuit. Further, several types of breakage tests were conducted; standard Bond tests to determine ore grindability and work indices, batch grinding tests to determine parameters for breakage and selection functions , and standard ball mill tests for mineral liberation characterization by an automated mineral liberation analyzer (MLA).The tests were conducted in a size range from 0.063 to 2 mm. Then, mass balance of the circuit was calculated and the models for mills, screens and hydrocyclones were employed in MODSIM (version 3.6.24). Firstly, simulations were conducted to optimize the existing plant. Several options were evaluated such as reduction of SAG screen aperture, adjustment of cyclone feed solids content and reduction of vortex finder and apex diameters. Moreover, simulations were also evaluated for a possible modification of the existing circuit and include; partial splitting of the cyclone underflow back to SAG mill, introduction of a second classification stage as well as introduction of a second ball mill. The evaluation of breakage tests and survey data revealed the following; the Bond work index obtained for the current ore ranges between 17.20 - 18.70 kWh/t compared to 14.50 - 16.50 kWh/t which was estimated during plant design.This indicates a change in hardness of the ore during the last 7 years. Harder ore means more energy requirement for an efficient operation, the consequence of which is increased costs. Thus, a periodic review of the ore hardness for ongoing mining operation is recommended. This will help in establishing better blends as well as prediction of appropriate tonnages for the existing ore types, so as to be efficiently treated by the available plant design. The work indices of the ore blends treated during survey were correlated with their quartz content and showed a strong linear relationship (R2= 0.95). Therefore, the work index for the BGM ore could be predicted based on known quartz content of the material. Further, the model could be used as a control tool for monitoring hardness variation of the SAG mill feed. The mineral liberation studies indicated that the valuable phase (pyrite-pyrrhotite) could be liberated at relatively coarser particle sizes (200-400 µm). This implies that, there could be no problem with the efficiency of the gravity circuit for the BGM operation, where the gold contained in pyrite-pyrrhotite could be easily concentrated. However, the efficiency of flotation and cyanidation processes will still require finer feed. In overall, the liberation characteristics of the ore blends treated during survey showed minor differences. The Bond efficiency factors of 48-61 % were obtained for the BGM grinding circuit, indicating an inefficient operation. This suggests that the operation could achieve targets by lowering the throughput. Further, the SAG mill circuit was characterized by fluctuating feed size of between xF,80 =102 to 185 mm. A need for control of the feed size as well as blending ratios was recommended for an efficient operation in terms of throughput and final product size. This could be achieved through closer monitoring of the primary crusher performance and proper control of the ratios for the SAG mill feeders drawing the ore from the stockpile. The ball mill grinding efficiency was poor and could be indicated by the fraction < 125 µm of only 5-9 % or xP, 80 : >400 µm in the mill discharge. This was deemed due to poor hydrocyclone performance which was characterized by higher feed solids content, coarser overflow xP,80: >200 µm as well as cut sizes, xT : > 200 µm. An improvement of product fineness up to 327 µm could be achieved during the simulation and optimization of the existing design. This could be achieved by modification of the operating conditions such as reduction of SAG screen aperture from 12 mm to 10 mm, reduction of vortex finder from 280 mm to 270.3 mm, reduction of apex diameter from 150 mm to 145.6 mm as well as adjustment of the cyclone feed solids content from 66.7 to 67.1 %. Based on this result, it was concluded that the current equipment could not achieve the target product quality (i.e. xP,80 = 125 µm ). Further simulations based on flowsheet modification options showed that a second ball mill (series configuration) can help to achieve the desired product fineness as well as an increase of throughput from 618 t/h to 780 t/h. Although the circulating load increases to approximately 500 % in this configuration, it is outweighed by the benefits. Importantly, this option is cost intensive and hence may be considered as a long term solution and especially after cost-benefit analysis. Finally, the results based on optimization of the existing design is recommended as short term solution for improvement of the BGM operation. Although the fineness achieved is still low (i.e. xP,80 = 327 µm) compared to the target (i.e. xP,80 = 125 µm), this gives additional advantage in the sense that, also better hydrocyclone performance is achieved in terms of overflow product (xP,80 = 105 µm vs. > 240 µm) , cut size (xT =133.1 µm vs. > 220 µm) and circulating load (CL =350 %). The improved overflow fineness will contribute to improved efficiency for the downstream processes.
6

Wagner, Pinto Fábio. "An experimental and numerical approach to investigate the machining performance of engineered grinding tools /." Zürich : ETH/ IWF, 2008. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17666.

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McClure, Kenneth Scott. "Algorithm for nonlinear process monitoring and controller performance recovery with an application to semi-autogenous grinding." Thesis, University of British Columbia, 2013. http://hdl.handle.net/2429/44639.

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Chemical and mineral processing industries commonly commission linear feedback controllers to control unit processes over a narrow and linear operating region where the economy of the process is maximized. However, most of these processes are nonlinear outside of this narrow operating region. In the event of a large unmeasured disturbance, a process can shift away from nominal and into an abnormal operating region. Owing to the nonlinearity of these processes, a linear controller tuned for the nominal operating region will perform poorly and possibly lead to an unstable closed-loop system in an abnormal operating region. Moreover, it is often difficult to determine whether a process has shifted to an abnormal operating region if none of the constraints on the measured process outputs are violated. In these events, it is the operator who must detect and recover the process, and this manual response results in a sub-optimal recovery. This thesis develops and demonstrates a control strategy that monitors several process variables simultaneously and provides an estimate of the process shift to a nonlinear abnormal operating region where a linear recovery controller is implemented to recover the process back to nominal. To monitor the process, principal component analysis is proposed for process shifts that can be detected by linear variable transformations. Alternatively, for nonlinear or high-dimensional processes, locally linear embedding is proposed. Once a process shift to an abnormal operating region is detected, the control strategy uses the estimate of the process shift in a recovery controller to recover the process. In the event the linear recovery controller is unable to recover the process, an expert system overrides the recovery controller to return the process to a recoverable region. A case study on a semi-autogenous grinding mill at a processing facility in British Columbia presents the successful application of the control strategy to detect and recover the mill from overloading. Portions of this control strategy have been implemented at this facility, and it provides the operators with a real-time estimate on the magnitude of the mill overload.
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Luczak, Bartholomäus [Verfasser], and Mathias [Akademischer Betreuer] Ulbricht. "Flow conditions inside spiral jet mills and impact on grinding performance / Bartholomäus Luczak ; Betreuer: Mathias Ulbricht." Duisburg, 2018. http://d-nb.info/1173616004/34.

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Hou, Yu. "Dem simulation and analysis of operating parameters on grinding performance of a vertical stirred media mill." Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/46504.

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Stirred media mills have been increasingly used in ultra-fine grinding. The VXPmill is a vertical high speed stirred media mill for grinding mineral ores with high efficiency. Since it is a new technology in the industry, there is little understanding on the breakage kinetics of the mill. In order to gain more knowledge about the VXPmill, computer modelling of the mill was performed. Laboratory grinding trials were also conducted on a pilot scale mill to provide more information about the mill’s capability, as well as verify simulation results. DEM (Discrete Element Method) is a powerful tool in predicting particle behaviour, which is ideal for the study of stirred media milling. The CFD (Computational Fluid Dynamics) is used to model the motion of slurry by numerically solving the Navier–Stokes equations facilitated with the Volume of Fluid (VOF) and multiphase flow models. Simulation results suggested that a velocity gradient exists in the fluid field and grinding media in the mill. The highest grinding media velocity was reached near the disc edge in the horizontal direction and near the bottom of the mill in vertical direction. Those are the most active grinding zones in a vertical stirred mill. Different operating parameters such as stirrer rotational speed, slurry solid content and slurry viscosity have an influence on mill performance. Simulation results show that operating the mill at a high impeller speed helps to improve mineral liberation, while at too high impeller speed leads to a waste of electric energy without much improvement in mineral liberation. As well, a mid-level slurry solid content (15% v/v to 30% v/v) was found to achieve the best energy utilization during grinding. The slurry viscosity should be kept low to minimize the effect of high shear stress in the slurry. The influence of various operating parameters can be combined into the ‘stress intensity’ which describes the capability of a stirred media mill. Operating parameters also have an influence on the magnitude of force magnitude between grinding media which will result in different breakage mechanism. Fracture breakage mechanism plays a more important role than attrition in VXPmill.
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Marquezin, Maria Carolina Salomé 1987. "Avaliação da disfunção orofacial, performance mastigatória, oclusão e morfologia craniofacial em crianças e adolescentes." [s.n.], 2012. http://repositorio.unicamp.br/jspui/handle/REPOSIP/288433.

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Orientadores: Paula Midori Castelo, Maria Beatriz Duarte Gavião
Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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Resumo: O conhecimento das influencias funcionais, ambientais e genéticas sobre o crescimento e desenvolvimento craniofacial é abrangente e difícil de quantificar, mas de suma importância para a prevenção de alterações que possam influenciar negativamente o desenvolvimento adequado dos maxilares e estruturas relacionadas. Sendo assim, a pesquisa teve o objetivo de avaliar a relação entre disfunção orofacial, morfologia craniofacial e da oclusão, força de mordida (FM) e performance mastigatória (PM) em crianças e adolescentes. Três estudos foram conduzidos e serão apresentados a seguir na forma de capítulos. O primeiro e segundo estudos buscaram avaliar a relação entre disfunção orofacial, PM, morfologia craniofacial e da oclusão, FM e bruxismo do sono. Para tanto, foram incluídas 316 crianças e adolescentes, de ambos os gêneros, divididas em quatro grupos: sujeitos com dentição mista inicial (n=20), mista intermediária (n=73), mista final (n=89) e permanente (n=134). A PM foi avaliada pela técnica de peneiragem, estimando-se a capacidade individual do sujeito em triturar um alimento-teste e determinando o tamanho mediano das partículas (X50) e a distribuição das mesmas nas diferentes peneiras (b). As disfunções orofaciais e a necessidade de tratamento ortodôntico foram avaliadas por meio do instrumento The Nordic Orofacial Test Screnning (NOT-S) e pelo Índice de Necessidade de Tratamento Ortodôntico (IOTN), respectivamente. A máxima FM foi mensurada utilizando-se um gnatodinamômetro digital e a morfologia craniofacial foi avaliada por meio de análise cefalométrica em norma lateral e frontal. A presença de bruxismo do sono também foi verificada por meio da avaliação de facetas de desgaste em incisivos e/ou primeiros molares permanentes e do relato de sons de ranger/bater os dentes pelos responsáveis/irmãos. Os resultados foram submetidos à estatística descritiva, testes de normalidade e correlação, análise de variância e regressão linear múltipla para se verificar quais variáveis em estudo contribuíram para a variação em X50 e nos escores do NOT-S. A variância de X50 e b mostrou-se estatisticamente significativa entre os grupos; já os escores do NOT-S não mostraram diferença entre as fases das dentições. Idade, índice de massa corporal, FM e presença de bruxismo relacionaram-se significativamente com uma melhor PM. A presença de selamento labial e maior trespasse vertical relacionaram-se com menores escores totais do NOT-S, enquanto a idade e a presença de bruxismo exacerbaram os escores de disfunção orofacial. Além disso, não foi observada correlação significativa entre morfologia craniofacial e escores de disfunção orofacial. Concluiu-se que o índice de massa corporal, força de mordida e presença de bruxismo contribuíram para uma melhor PM; enquanto o aumento nos escores de disfunção orofacial relacionou-se a uma PM prejudicada. Além disso, o aumento do trespasse vertical e a presença de selamento labial relacionaram-se a menores escores de disfunção orofacial em indivíduos jovens. O terceiro capítulo aborda o estudo do dimorfismo facial e sua relação com as dimensões craniofaciais e dos arcos dentários e espessura ultrassonográfica do músculo masseter em crianças na fase de dentição mista. O estudo envolveu 32 crianças (14?/18?), com oclusão normal, e avaliou as dimensões craniofaciais por meio de telerradiografias em norma frontal. Os resultados foram submetidos à estatística descritiva, teste de normalidade, teste ?t? e regressão linear múltipla para se verificar a diferença entre os gêneros e quais variáveis contribuíram para a variação da medida da largura facial. Apesar da comparação da largura facial entre gêneros ter mostrado diferença significativa, quando se verificaram quais variáveis em estudo contribuíram para esta variação, observou-se que o índice de massa corporal, espessura do masseter, distância intermolares inferiores e intercaninos superiores e largura intermolar maxilar foram as variáveis significativamente relacionadas com a largura facial, enquanto o gênero não alcançou nível significativo. Concluiu-se assim que as variáveis funcionais e morfológicas do sistema estomatognático mostraram forte relação com a largura da face
Abstract: Knowledge of the functional, environmental and genetic influences on the craniofacial growth and development is comprehensive and difficult to quantify, but very important to prevent changes that may affect the proper development of the jaws and related structures. Therefore, this study aimed to evaluate the relationship between orofacial dysfunction, occlusal and craniofacial morphology, bite force (BF) and masticatory performance (MP) in children and adolescents. Three studies were conducted and are presented below in the form of chapters. The first and second study aimed to evaluate the relationship among orofacial dysfunction, MP, occlusal and craniofacial morphology, BF and sleep bruxism. The sample included 316 children and adolescents of both genders, divided into four groups: subjects with early (n=20), intermediate (n=73), late mixed (n=89) and permanent (n=134). MP was assessed by sieving technique and verifying the individual's ability to comminute an artificial test food in order to determine median particle size (X50) and distribution of particles in the different sieves (?b?). The orofacial dysfunction and need for orthodontic treatment were evaluated using the instrument The Nordic Orofacial Test-Screnning (NOT-S) and the Index of Orthodontic Treatment Need (IOTN), respectively. Maximum BF was measured using a digital gantodinamometer and craniofacial morphology was assessed by means of lateral and posteroanterior cephalometric analysis. The signs and symptoms of sleep bruxism were recorded taking into account the presence of shiny and polish facets on incisors and/or first permanent molar and sibling/parental report of grinding sounds. The results were submitted to descriptive statistics, normality and correlation tests, analysis of variance and multiple linear regression to determine which variables significantly contributed to X50 and scores on NOT-S variation. The variance of b and X50 were statistically significant between groups, whereas scores of NOT-S showed no difference among the stages of dentition. Age, body mass index, BF and the presence of bruxism was significantly correlated with better MP. The presence of closed lip posture and increased overbite measurements were related to lower total scores on NOT-S, whereas age and the presence of bruxism exacerbated orofacial dysfunction scores. In addition, a significant relation between craniofacial morphology and orofacial dysfunction was not found. It was concluded that body mass index, BF and the presence of sleep bruxism contributed to a better PM, while the increase in the scores of orofacial dysfunction was related to a worse PM. In addition, increased overbite measurement and closed lip posture related to lower scores of orofacial dysfunction in young individuals. The third chapter discusses the study of facial dimorphism and its relation with craniofacial and dental arches dimensions and ultrasonographic thickness of the masseter muscle in children in the mixed dentition. The study included 32 children (14?/18?) with normal occlusion and craniofacial dimensions were assessed by frontal radiographs. The results were submitted to descriptive statistics, normality test, "t" test and multiple linear regression to determine the difference between genders and which variables significantly contributed to the variation in facial width. Although the comparison of facial width between genders have shown significant differences, when the others studied variables were tested, it was observed that body mass index, masseter thickness, lower intermolar distance, upper intercanines distance and maxillary intermolar width were the variables that significantly related to facial width, while gender did not reach significant level. It was concluded that the functional and morphological variables of the stomatognathic system showed a strong relation with face width
Mestrado
Odontopediatria
Mestre em Odontologia
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Books on the topic "Grinding performance":

1

Jackson, Mark J. High Performance Grinding and Advanced Cutting Tools. New York, NY: Springer New York, 2013.

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Jackson, Mark J., and Michael P. Hitchiner. High Performance Grinding and Advanced Cutting Tools. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-3116-9.

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Howat, D. D. The performance and wear characteristics of grinding media as affected by metallurgical and dimensional factors. Randburg, South Africa: Council for Mineral Technology, 1986.

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Jackson, Mark J. High Performance Grinding and Advanced Cutting Tools. Springer, 2012.

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Accinno, Michael. Disabled Union Veterans and the Performance of Martial Begging. Edited by Blake Howe, Stephanie Jensen-Moulton, Neil Lerner, and Joseph Straus. Oxford University Press, 2016. http://dx.doi.org/10.1093/oxfordhb/9780199331444.013.20.

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This essay discusses the phenomenon of disabled Union veterans who turned to the profession of organ grinding during and after the American Civil War: they became mendicant musicians who played music in the streets to beg for money. Within a cultural logic that emphasized the sorting of worthy from unworthy poor—and “true” veterans from “imposters”—the related practices of street music and mendicancy were harshly stigmatized. Although artistic and literary representations of disabled organ grinders often used the performers as rhetorical devices to elicit fear, loathing, or pity, closer scrutiny of surviving documentary evidence reveals that the men indeed possessed agency, along with a capacity and desire for self-representation.
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Chiou, Wen-An, Helmut Coutelle, Andreas Decher, Michael Dörschug, Reiner Dohrmann, Albert Gilg, Stephan Kaufhold, et al. Bentonites -. Edited by Stephan Kaufhold. E. Schweizerbart Science Publishers, 2021. http://dx.doi.org/10.1127/bentonites/9783510968596.

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<p><b>Bentonites</b> are rocks mostly consisting of swelling clay minerals. They were first described from the Cretaceous Benton Shale near Rock River, Wyoming, USA. </p> <p> Because of their useful properties (e.g. highly adsorbent, cation exchanging, swelling), bentonites have many uses, in industry (among them as drilling mud, purification agent, binder, adsorbent, paper production), culture (for e.g. pottery) and medicine/cosmetics/cat litter, civil engineering, and in the future even in the disposal of high-level nuclear waste. </p> <p> Particular chemical characteristics of bentonite clay minerals are rather variable but critically determine their suitability for a particular application. </p> <p> The 15 specialist authors discuss bentonite terminology, classification and genesis and use in eight chapters. Individual chapters deal with the methods bentonites are analysed with, their properties and performance in terms of parameters such as cation exchange capactiy, rheology, coagulation concentraion, water uptake capacity, free swelling, and electrical resistivity (amongst others). </p> <p> A chapter is dedicated to the sources of bentonites, the technology employed to produce them, and how quality control is carried out both in the mine and the laboratory. A further chapter is dedicated to methods of processing the mined material, different activation methods, drying, grinding, and purification. </p> <P> Use cases for bentonites are discussed in a chapter of its own. References, a section on norms and standards, and a list of abbreviations complete the text. </p> <p> The volume addresses students, researchers, and professionals in the mineral industry dealing with bentonite and their clay-mineral constituents, quality assessement and control, and persons that use bentonites in their products. </p>
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Llano, Samuel. Discordant Notes. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780199392469.001.0001.

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Scholarship on urban culture and the senses has traditionally focused on the study of literature and the visual arts. Recent decades have seen a surge of interest in the effects of sound on the urban space and its population. These studies analyze how sound generates identities that are often fragmentary and mutually conflicting. They have also explored the rise of campaigns against the negative effects of noise on the nerves and health of the population. However, little research has been carried out on the impact of sound and music in areas of broader social and political concern, such as social aid, hygiene, and social control. Based on a detailed study of Madrid from the 1850s to the 1930s, this book argues that sound and music have played a key role in structuring the transition to modernity by helping to negotiate social attitudes and legal responses to problems such as poverty, insalubrity, and crime. Attempts to control the social groups that own unwanted musical practices such as organ-grinding and flamenco performances in taverns raised awareness about public hygiene, alcoholism, and crime and triggered legal reform in these areas. In addition to marginalizing and persecuting these musical practices, the authorities and the media used workhouse bands as instruments of social control to spread “aural hygiene” across the city and wipe out unwanted musical practices.

Book chapters on the topic "Grinding performance":

1

Rabiey, Mohammad. "High Performance Grinding." In CIRP Encyclopedia of Production Engineering, 1–3. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-642-35950-7_16720-1.

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Rabiey, Mohammad. "High Performance Grinding." In CIRP Encyclopedia of Production Engineering, 869–71. Berlin, Heidelberg: Springer Berlin Heidelberg, 2019. http://dx.doi.org/10.1007/978-3-662-53120-4_16720.

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Kuffa, Michal, and Konrad Wegener. "High-Performance Dry Grinding." In CIRP Encyclopedia of Production Engineering, 1–7. Berlin, Heidelberg: Springer Berlin Heidelberg, 2018. http://dx.doi.org/10.1007/978-3-642-35950-7_16865-1.

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Aurich, J. C., A. Bouabid, P. Steinmann, and B. Kirsch. "High-Performance Surface Grinding." In Lecture Notes in Production Engineering, 81–100. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-32448-2_4.

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Kuffa, Michal, and Konrad Wegener. "High-Performance Dry Grinding." In CIRP Encyclopedia of Production Engineering, 893–99. Berlin, Heidelberg: Springer Berlin Heidelberg, 2019. http://dx.doi.org/10.1007/978-3-662-53120-4_16865.

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Tian, Xin Li, Z. Y. Wu, and Zhong Xiang Hu. "Study on the High Efficiency Organic Grinding Fluid Used for Ceramic Grinding." In High-Performance Ceramics III, 1787–90. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-959-8.1787.

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Li, Zhi Hong, Yong Hong Zhang, Y. M. Zhu, and Zheng Fang Yang. "Sintering of Vitrified Bond CBN Grinding Tool." In High-Performance Ceramics III, 1391–94. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-959-8.1391.

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Zhang, Xiao Feng, Bin Lin, and Fang Yang Zhang. "Precision Grinding of Concave Spherical Surface of High-Alumina." In High-Performance Ceramics V, 726–28. Stafa: Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/0-87849-473-1.726.

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Jackson, Mark J., and Michael P. Hitchiner. "Abrasive Tools and Bonding Systems." In High Performance Grinding and Advanced Cutting Tools, 1–43. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-3116-9_1.

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Jackson, Mark J., and Michael P. Hitchiner. "Vitrified Bonding Systems and Heat Treatment." In High Performance Grinding and Advanced Cutting Tools, 45–93. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-3116-9_2.

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Conference papers on the topic "Grinding performance":

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Thanedar, Azhar, Rajkumar Singh, and Suhas Joshi. "Cylindrical Grinding Performance Evaluation." In 2018 9th International Conference on Mechanical and Aerospace Engineering (ICMAE). IEEE, 2018. http://dx.doi.org/10.1109/icmae.2018.8467609.

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Lin, Wei-Shin, Yung-Cheng Wang, Wen-Chi Hsiao, and Bean-Yin Lee. "Grinding performance analysis of diamond wheel for groove grinding." In 2010 8th IEEE International Conference on Control and Automation (ICCA). IEEE, 2010. http://dx.doi.org/10.1109/icca.2010.5524334.

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Tawakoli, Taghi, and Bahman Azarhoushang. "Effects of Ultrasonic Assisted Grinding on CBN Grinding Wheels Performance." In ASME 2009 International Manufacturing Science and Engineering Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/msec2009-84186.

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The effects of ultrasonic assisted grinding on vitrified CBN grinding wheels performance have been investigated. The ultrasonic vibration has been superimposed to the workpiece in feed and cross feed directions and the kinematics of the process in both directions have been discussed. The obtained results show that applying ultrasonic vibration to the grinding process can improve the quality of the workpiece surface, the efficiency of the process and decrease the grinding forces and specific energy considerably.
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Tawakoli, Taghi, Abdolreza Rasifard, and Alireza Vesali. "Effect of the Grinding Oil Type on CBN Grinding Wheels Performance." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-12234.

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The efficiency of the grinding process highly depends on the coolant lubricant used. In grinding with CBN grinding wheels grinding oils are used increasingly. In the last decade new grinding oils based on different oil types are brought into the market, whose effect on the CBN grinding wheels performance until now not sufficiently been investigated. The Institute of Grinding and Precision Technology (KSF) investigated the influence of four different grinding oils on the performance of vitrified CBN grinding while grinding of 100Cr6 (M.-No. 1.3505), which is a heat-treatable steel with a very good grindability, and Nimonic A80, which is a difficult to grind heat-resistance superalloy. The obtained results show that the performance of the vitrified CBN grinding wheels—while using grinding oil as coolant lubricant—regarding the quality of the work piece surface, the grinding forces as well as the wear of the grinding wheel, highly depend on the viscosity of the grinding oil. Moreover, the results show that the surface quality and the grinding forces while using different grinding oils depend significantly on the work piece material.
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Singh, Pushpendra, Avanish Kumar Dubey, and Pankaj Kumar Shrivastava. "Performance Evaluation of Electrical Discharge Abrasive Grinding Process using Grinding Ratio." In 2019 8th International Conference System Modeling and Advancement in Research Trends (SMART). IEEE, 2019. http://dx.doi.org/10.1109/smart46866.2019.9117443.

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IMAI, Tomoyasu, Ryouhei MUKAI, Takayuki YOSHIMI, and Masanori YOSHIKAWA. "PERFORMANCE OF GRINDING FLUIDS FOR HIGH-SPEED GRINDING USING CBN WHEEL." In Proceedings of the International Symposium. WORLD SCIENTIFIC, 1997. http://dx.doi.org/10.1142/9789814317405_0026.

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Zhang, Hong, Junghsen Lieh, and David Yen. "Dynamic Performance of Shoe Centerless Grinding." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-32895.

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In this paper, the dynamic performance of shoe centerless grinding is presented. The model is a single-mass system in time and frequency domains. Based on the model, the stability and the critical parameters of the grinding process were studied. Numerical simulations were conducted in order to evaluate key parameters for the grinding process. The model was verified by experiments from real grinding trials.
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Lianjie, Ma, Yu Aibing, Wang Jia, Li Chen, and Wang Fengwen. "Finite Element Simulation of Grinding Performance and Grain Shapes in Grinding Superalloy-Inconel." In 5th International Symposium on Knowledge Acquisition and Modeling (KAM 2015). Paris, France: Atlantis Press, 2015. http://dx.doi.org/10.2991/kam-15.2015.54.

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Phan, Andrew M., Michael P. Summers, and John P. Parmigiani. "Optimization Device for Grinding Media Performance Parameters." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-64210.

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The investment casting industry relies heavily on the use of grinding media during manufacturing. Typically, grinding media, when used in this application, have very short effective lifetimes. Determining the optimum life of grinding media is a key cost-containment and manufacturing-efficiency issue. However, current methods for determining optimum life as well as evaluating new grinding media products and optimum operating parameters are highly subjective and often is a matter of operator opinion. This subjectivity can lead to the premature retirement or overuse of grinding media, increasing cost and decreasing efficiency. A means of objectively and efficiently evaluating grinding media for optimum life and operating conditions, as well as evaluating new grinding-media products is needed. The approach taken in this work is to create a relatively low-cost test apparatus that uses grinding equipment, media, and specimens typically seen in the casting industry and measures key parameters. Also, the apparatus produces the fundamental motions and application forces typical of human operators. The resulting apparatus simultaneously moves a specimen in three orthogonal directions while applying a user-defined grinding force. Applied force, electric power input, grinding-motor rotational speed, test-specimen surface temperature and material removal are recorded. All operations of the device are autonomously performed through LabVIEW. The apparatus was constructed using standard commercial products for less than $15,000. Data comparing applied load versus material removal rate, surface temperature, and total material removed can be collected for different materials and grinding media. The device has been used to grind inconel specimens subjected to 10 to 70 pounds (45–312 N) of contact force corresponding to material removal rates of 0.26 to 5.26 grams/s at temperature changes of 90 to 210 degrees Fahrenheit (32.2–98.9 degrees Celsius). This data was used to determine a correlation between changes in performance parameters and a drop in material removal rate, total material removed, and belt life. No significant difference was found between the material removal rate of saw-cut and flame-cut Inconel specimens, dispelling a commonly held belief. Knowing key parameters that identify the effective lifetime of grinding media is significant to the casting industry. Methods described in this paper can be used to optimize grinding media life and determine optimum operating parameters.
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de Martini Fernandes, Lucas, José Claudio Lopes, Roberta Silveira Volpato, Paulo Aguiar, Anselmo Diniz, Hamilton José de Mello, and Eduardo Carlos Bianchi. "Comparative analysis of two CBN grinding wheels performance in nodular cast iron plunge grinding." In 24th ABCM International Congress of Mechanical Engineering. ABCM, 2017. http://dx.doi.org/10.26678/abcm.cobem2017.cob17-2789.

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Reports on the topic "Grinding performance":

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Rajive Ganguli and Sukumar Bandopadhyay. Low-Rank Coal Grinding Performance Versus Power Plant Performance. Office of Scientific and Technical Information (OSTI), December 2008. http://dx.doi.org/10.2172/963349.

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