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Jul 12, 2021The predicted normal grinding forces, in most cases, were in good agreement with the experiments with higher than 75% accuracy. Although the wheel balancing issues at the highest cutting speed ( vc = 35 m/s) caused large deviations between the predicted and measured forces. Introduction
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The experimental result indicated that grinding force ratio and specific energy would decrease when chip formation played a dominant role in the mechanism of grinding. Workpiece ground surface was free of crack but cutting traces and micro-grooves on ground surface were much more obvious under higher feed rate.
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The model was created by using the UDEC Trigon method in which the rock and coal samples were represented as an assembly of triangular blocks that were bonded through contacts 46. Each triangular...
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Components require grinding to reach a final shape, and to attain the required tolerances. The form grinding process offers savings due to the decrease in the number of steps used to create a desired profile. As Step 1. Chamfer grinding CONVENTIONAL APPROACH (One feature in each step) Step 2. Face grinding Step 3. Post grinding Step 4.
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Nanoparticles are solid nanoscale particles with features such as antiwear, antifriction, and high load-carrying capacity. This research applied nanoparticles in the cooling lubrication of grinding and theoretically analyzed the impact of cooling lubrication on the grinding surface through the energy ratio coefficient and specific grinding energy. First, the workpiece surface temperature was ...
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One researcher quoted an effective flow rate of 3% in high efficiency deep grinding (HEDG) with electroplated CBN grinding of steel. Another achieved 9.6% with similar wheels, grinding nickel-based alloys. Research is currently being conducted in this area at the University of Bremen (Germany) and Liverpool JM University (UK).
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In addition, it was approximately four times higher in grinding ratio. In addition, the lower abrasive wheel wear and longer tool life were obtained using PCBN grinding. ... Tangential and normal grinding force were respectively 6.7 N and 11.5 N, obtained from Ref. ... Chen X (2012) Experimental investigation of material removal mechanism in ...
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About this journal. This Journal of Micromanufacturing welcomes original high quality research papers in the areas of traditional and advanced Micromanufacturing Science and Technology. To name some of the areas but not limited to, are as follows: Micromachining, Nanofinishing, Microjoining, Microforming, Microforging, Microcasting, Additive microfabrication, High aspect ratio fabrication ...
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Apr 6, 2021The sample was a cylinder with a 15 mm diameter and 7 mm height. The pretreatment process of the workpiece involved grinding the sample with an 80 grit-sized diamond grinding wheel and 38 nm, 25 nm, 18 nm and 15 nm silicon carbide abrasives, respectively. The sample was ground with a fixed diamond grinding pad with a particle size of about 5 ...
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The mechanical properties of rocks under low to intermediate strain rate are of great importance for seismic engineering, rock impact, and blasting excavation. To study the strength and deformation characteristics of sandstone subjected to low-medium speed impact loading, the complete stress-strain relationships of uniaxial compression at strain rates of 10−2∼55 ...
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Ra is the arithmetic average of the roughness profile. Figure 1 presents the surfaces from the different preparations. Fig. 1 Adherend surfaces from the different preparations Full size image The results of profilometer measure were Ra = 6.94 μm for sandblasting, Ra = 2.58 μm for sanding and Ra = 0.45 μm for chemical cleaning.
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Grinding ratio is a convenient way to determine if the grinding wheel is sharp or blunt just by looking at the ratio (µ). When the grinding wheel is blunt, the thrust force would normally be higher than the cutting force, hence, giving a very low value. On the other hand, if the grinding wheel is sharp, when comparing the cutting force to the
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Sep 1, 2022They modelled the 2D profile geometry of a grinding wheel surface considering grain fracture percentage based on dressing parameters as the effect of transversal overlapping ratio and speed ratio. Both experimental and predicted results showed that higher cross feed speed (lower Ud) resulted in higher tangential and normal dressing forces.
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In this work, we experimentally investigate the optimization of annular polishing parameters of RB-SiC by first analytical investigation of influential parameters based on the Preston equation and the coupling of polishing motions, and then systematic polishing experiments and characterization.
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The aim of this work was investigation for establish "The influence of grinding parameters on: forces, temperature, grinding ratio and surface layer parameters of selected grades of low-alloyed high-speed steels" /LAHSS/. 2. Research method The samples for research with dimensions 6x6x65 mm were made of experimental melts.
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A combined analytical-experimental investigation of friction in cylinder liner inserts under mixed and boundary regimes of lubrication. ... λ = h/σ is the Stribeck lubricant film ratio. F 5/2 is a statistical function of the film ratio, ... Note that a rougher surface resulted by centre-less grinding of the Ni-SiC coated surface. This is ...
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Then, the effective factors on grinding efficiency such as specific energy (SE), Cutting force (FC), metal binder removal rate (MRR), grinding ratio (G-ratio), wear resistance and Mean free path...
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Sep 1, 2022This study aims to conduct an experimental and DEM study to evaluate the performance of a lab scale, notch-type HPGR which is widely used in the cement industry. Cement particle breakage and the motion of the floating roll are considered in the model. The effects of roll speed and pressing pressure on the process are investigated.
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Due to its ability to provide more inter-grit chip space and higher grit protrusion, monolayer-brazed CBN wheel has great potentials in internal traverse grinding (ITG) of small holes of high strength and toughness materials. Before engineering application, it is necessary to study the wear behavior and wear mechanism of the brazed CBN wheels. A series of internal traverse grinding tests was ...
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Experimental studies on grinding forces and force ratio of the unsteady-state grinding technique Authors: Z. C Li B. Lin Tianjin University Y. S Xu J Hu Abstract The whole machining process of...
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and the grinding process was described primarily by the frictional rubbing force on the clearance face. This is known as the 'grain rubbing hypothesis'. The justification for the grain rubbing hypothesis is based on the ratio of tangential to normal forces in grinding. The ratio of tangential to normal forces in grinding is typically of the
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In the experimental tests carried out at 0.25, 0.5, 0.75, and 1 m/s speeds and with 0.2-15 kg loads, using SBR- and RSS-based samples, the friction forces of the materials and the variation of friction forces depending on speed and load were determined by using a wear test device.
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The workpiece vibrated at the same direction as normal force with a maximum amplitude of 45 m.Their finding showed a 35% decrease in grinding forces and 42% reduction of heat flux into the workpiece. Effort is generally made in the application of ultrasonic vibration to machining processes, [12- 20].
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The experimental investigation of alumina nanofluid (as cutting fluid) for high-speed grinding of EN31 steel in reduction of surface roughness and surface temperature was discussed, and the following are the findings: (i) The two extreme parameters settings are as follows: all inputs are low and high. At low depth of cut of 10 μm and low feed ...
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The samples required for the test were prepared by drilling, coring, cutting, and face grinding the rock. To minimize the influence of individual differences between the samples on the test results, the samples were processed into cylindrical samples with a diameter of 50 mm and a height-diameter ratio of 2 ± 0.2.
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ductile mode grinding of hard and brittle materials, the critical depths of cut changed depending on the machining directions and coolant fluids used [11]. 2.1. Brittle to ductile mode machining The challenge faced in machining brittle material such as glass is how to ensure that the material removal occur by
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3 days agoThe samples required for the test were prepared by drilling, coring, cutting, and face grinding the rock. To minimize the influence of individual differences between the samples on the test results, the samples were processed into cylindrical samples with a diameter of 50 mm and a height-diameter ratio of 2 ± 0.2.
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Li ZC, Lin B, Xu YS, Hu J (2002) Experimental studies on grinding forces and force ratio of the unsteady-state grinding technique. J of Mater Process Technol 129:76-80 Article Google Scholar Malkin S (1989) Grinding technology theory and applications of machining with abrasives. Ellis Horwood Ltd., Chichester Google Scholar
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Jung et al. [ 7] conducted experimental investigation of wing with NACA 6409 section. Three different types of endplates were tested in those experiments at various ground clearances, angle of attacks, and aspect ratios. Endplates help to increase the performance of the wing though moving its center of pressure forward to the leading edge.
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Experimental investigation of a slip-line field model for a worn cutting tool Alper Uysal and Erhan Altan ... were worn with SiC grinding wheel at 120mm diam- ... Figure 5 and the ratio graphs of resultant force to friction force was shown in Figures 6 and 7. In Figure 5, the friction force increased with ...
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Experimental studies on grinding forces and force ratio of the unsteady-state grinding technique. ZC Li, B Lin, YS Xu, J Hu. Journal of materials processing technology 129 (1-3), 76-80, 2002. 37: ... Experimental investigation of intermittent rotary ultrasonic machining. WM Zeng, ZC Li, XP Xu, ZJ Pei, JD Liu, J Pi. Key Engineering Materials 359 ...
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2. Grinding occurs at the beginning and the end of the cement making process. Approximately 1.5 tonnes of raw materials are required to produce 1 tonne of finished cement. The electrical energy consumed in the cement making process is in order of 110 kWh/tonne and about 30% of which is used for the raw materials preparation and about 40% for ...
Get priceThe error is 6.3% between theoretical calculation temperature and experimental measurement temperature. Based on machining process parameters (specific grinding force, force ratio) and experimental results (microstructure of grinding wheel, workpiece, and grinding debris), the effects of different working conditions on wheel wear are studied.
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A theoretical and experimental investigation of explicit force control strategies for manipulators Abstract: This paper presents a complete overview of basic strategies that have been proposed for force control of robot manipulators. First, the model of the plant to be controlled is reviewed. Next, the strategies are divided into force-based ...
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the most obvious interpretation of the process is spontaneous symmetry breaking of a pitchfork bifurcation: prepared in a squeezed vacuum state and driven by shot noise, the opo state bifurcates, during which its amplitudes ai grow either in positive or negative value, and subsequently the system settles into the ising ground state (or a .
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In our case, the influence of the adhesion force is considered as a first approximation by an effective normal force W, and W = F a + F n []. As shown in Fig. 7, the adhesion force keeps the same level of ∼0.2 μN when RH changes. However, compared with 15 μN applied load, the adhesion force is nearly two orders of magnitude smaller than it.
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2.2. Experimental Schemes. The first scheme is the orthogonal experiment of three factors and three levels of steel fiber UHPC, as shown in Table 4. 17% slag powder, 10% quartz powder, and 8% silica powder are added to replace part of the cement.In addition, (1) the water-binder ratio (W/B) is taken as a factor, and the three factors are proposed to account for 0.18%, 0.2%, and 0.22% ...
Get priceABSTRACT A ceramic nonplastic (specific gravity 3.01) was wet‐ground with solid‐liquid ratios of 2.7 to 1 and 1 to 15 for various lengths of time. Grain‐size distribution and surface area, as measured by the Wagner turbidimeter method, were compared. The material ground with the least water gave a lower percentage retained on a 325‐mesh screen, fewer particles between 10 and 60 microns ...
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An Investigation on wear of monolayer brazed CBN wheels in high speed grinding of particulate reinforced titanium matrix composites. ... Studies on the grinding force, size effect, surface texture, and mechanism of material removal in the grinding of AA6061-TiB2/ZrB2 in situ composite ... Numerical and Experimental Study on the Grinding ...
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Experimental studies on grinding forces and force ratio of the unsteady-state grinding technique. J Mater Process Tech 2002 ; 129(1): 76 - 80 . Google Scholar | Crossref | ISI
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