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In order to meet the P2-grade bearing grinding requirements, we designed a high-speed internal grinding machine to be used for grinding bearing raceways and inner circles. The machine has a T-type layout and a four-axis numerical control linkage. It is supported by hydrostatic pressure and driven directly by a torque motor. In addition, it …
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The Dead Shaft High Speed Swing Frame Grinder is rugged, heavy-duty, high speed grinder with full lateral movement for use in foundries and steel mills. The Fox #4 is a high speed, dead shaft grinder with full lateral movement and is ideal for grinding castings, billets, ingots, and forgings.
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The material removal in the grinding of alumina and alumina–titania was dominated by grain dislodgement or lateral cracking along grain boundaries. The removal for zirconia was via both local micro fracture and ductile cutting. ... High speed grinding has been studied for achieving a high removal rate in the machining of ceramics [8].
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The high speed grinding machine, BLOHM PROFIMAT MT-408 with water base grinding fluid was employed. The maximum rotational speed and output power were 8000 rpm and 45 kW respectively. Fig. 1 shows the schematic of the single-grit grinding experimental set-up. The grit holder and the balancing weight were symmetrically …
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The rail high-speed grinding technique, involving "non-driven" grinding wheels that remove a very shallow depth of cut, has been introduced in the preventative operation for High-Speed Railway by ...
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High quality and efficiency of grinding for SiC can been attained with high-speed grinding due to the understanding of the characteristics and mechanism for …
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Crack suppression is caused by high pressures and brittle-ductile transitions during high-speed grinding. The synergism of initial material temperature and critical …
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A pre-grinding operation before t he opening of a high-speed railway can eliminate the defects of t he Received date: Foundation item : Th e National Natural Science Foundation o f ...
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Viable remediation of the large lateral deformation of high-speed railway (HSR) subgrades, especially in soft soil areas, is still absent. An integrated rectification scheme of high-pressure jet-grouting (HPJG) combined with stress-release techniques was conducted to rectify the large lateral deformation of an operational HSR subgrade in the …
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Figures 4A and 4B illustrate such a curve which presents the effectiveness of high-speed grinding as performed by a new-generation 2880 HP high-productivity grinding train.4 Figure 4A shows maximum depth of metal removal versus speed in the range of eight to 14 mph for two different grinding patterns. Figure 4B shows total cross …
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1. Introduction. High-speed can often help improve ground surface quality and integrity in grinding of brittle materials like optical glass [1, 2] and ceramics [[3], [4], [5]].In recent years, the influence of wheel speed on the ductile-brittle transition and subsurface damage (SSD) has been investigated both analytically and experimentally.
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In accordance with the classification of different grinding speeds, there are three categories used to depict the speed of nanoscale machining: a general grinding speed which is less than 45 m s −1, a high grinding speed of 45–150 m s −1, and an ultra-high grinding speed which is more than 150 m s −1.
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Ultra-high-speed grinding is a significant method for the advanced manufacturing of the difficult-to-machine material components, e.g., nickel-based superalloy. However, unclear mechanism of material removal behavior is still the main problem. The present work intends to establish the three-dimensional (3D) finite element …
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To reveal the links between brittle to ductile transition and subsurface damage mechanism when undergoing the high-speed grinding process, we built a contrast model of Al substrate and Si thin film with the same size. The grinding process is carried out on the (0 0 1) surface along the [0 1 0] direction. The workpiece can be …
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Based on the merits of abrasive belt grinding [5,6], a novel fast rail grinding car based on open-loop structured belt grinding has been proposed for high-speed railways [7]. It aims to ...
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In the high-speed grinding (HSG) process of cemented carbide, the grinding principle of is explained mainly from two aspects: indentation fracture model and cutting of brittle materials. ... Eventually, when these lateral cracks propagate and reach the free surface, material removal occurs. The constitutive model of hard and brittle …
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As such, they are considered nodal projects in the construction and operation of high-speed railway networks. By the end of 2022, the mileage of China's high-speed railways reached 42,000 km, of which more than 10,000 sets of …
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Literature indicated that at high grinding speed (160 m/s), brittle to ductile transition takes place for alumina; and alumina can be ground effectively with reduced amount of brittle fracture at high grinding speed [12], [13], [14].However, at moderately high grinding speed of 80 m/s, the brittle fracture has been widely observed and reported.
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In order to meet the P2-grade bearing grinding requirements, we designed a high-speed internal grinding machine to be used for grinding bearing raceways and inner circles. The machine has …
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In this work, the grinding tests are conducted on a high-speed cylindrical CNC grinder MGKS1332/H, which could reach a wheel speed of up to 150 m/s. The detailed configuration for the grinding experiments is listed in Table 1. In this paper, a vitrified diamond grinding wheel, with diamond concentration of 150%, diameter 400 …
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A high grinding speed and low feed rate help suppress crack propagation [32, 33]. A reduction in the cutting depth of grits is beneficial for the promotion of ductile-mode material removal, thus achieving no crack damage [34, 35]. Previous studies utilised the single-scratch method to clarify the crack propagation behaviour by analysing the ...
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Suggestions for improving the high-speed rail-grinding technology are also provided. Picture and roughness spectra of rail corrugation in Section A. ... or lateral movement [4]. Wheel slip or ...
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High-speed grinding is proposed in ceramics grinding for high material removal rate and surface quality. The dynamic fracture toughness of ceramic materials …
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In high-speed grinding, the speed can exceed 100 m/s, such as 30–150 m/s and 40–200 m/s in Refs. ... Subsequently, the lateral crack and failed particles occur at 78 nm. While the lateral crack propagates and becomes large at 86 nm, the separate particles at the bottom of abrasive occur simultaneously. Thus, it can be concluded that …
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High-speed grinding is descriptive of the higher and a truing medium that offers efficient wheel dressing. peripheral grinding speeds that are now being used with vitri- fied …
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To understand the differences in material removal behavior during grinding for different ceramics, scratching of Al 2 O 3, AlN, Si 3 N 4 and ZrO 2 (3Y-TZP) ceramics by a cube-corner diamond indenter was investigated in this paper. Scratching characteristics, including material deformation, scratching force, coefficient of friction (COF) and …
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Turnouts are the weak spot in high-speed rail systems, and it is simple for the phenomenon of the wheel–rail force and the carbody lateral acceleration over-limit to arise when the train passes through, …
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A much higher sliding velocity can ensure an ideal material removal and reduce the depth of subsurface damage and surface roughness. These disciplines can …
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To explore material removal mechanisms in high-speed grinding, this study carries out high-speed grinding (HSG) on an Al/SiCp MMC at a grinding speed from 30.4 m/s to 307.0 m/s, and assesses surface integrity including surface damage and subsurface damage (SSD) to explore how different grinding speeds take effect therein.
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For China high-speed railways (CHSR), the wavelength of rail corrugation for high-speed running situation is usually between 120 mm and 150 mm. For low speed, it is normally from 60 mm to 80 mm. ... To investigate the performance of the fast rail-grinding car more truly, the lateral and vertical excitations from China Wuhan …
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The grinding force and grinding temperature in the process of high-speed grinding will affect the patient's comfort and medical safety. Enamel surface quality and micro-damage after high-speed grinding will affect the subsequent repair effect and long-term service performance (Gonzaga et al., 2015). As per the literature, the knowledge of …
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The Dead Shaft High Speed Swing Frame Grinder is rugged, heavy-duty, high speed grinder with full lateral movement for use in foundries and steel mills. The Fox #4 is a high speed, dead shaft grinder with full lateral movement and is ideal for grinding castings, billets, ingots, and forgings.
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Contact band width increases significantly up to 35 mm when the passing gross weight is about 5.203 ×107 t, 17 months later after the grinding, The alarm parameters of the lateral acceleration of ...
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Grinding speed refers to the linear speed of the grinding wheel, which is generally 30~35m/s, and it is called high-speed grinding when it exceeds 45m/s. Grinding is usually used for semi-finishing and …
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