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Material removal begins with a vibrating tool. The vibration propels particles at accelerations in excess of 25,000 g's. These dynamic particles collide with and grind the workpiece on …
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Illustrated in Fig. 1 is the schematic representation of the ultrasonic vibration-assisted helical grinding (UVHG) process applied to SiC p /Al composites. The ultrasonic vibration is executed in a reciprocating motion along the axial direction of the tool. Within the realm of ultrasonic machining, the material removal mechanism involves a dual-faceted …
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In contrast, ultrasonic machining (UM or USM) is a non-thermal, non-chemical and non-electrical machining process that leaves the chemical composition, material microstructure and physical properties of the workpiece unchanged. Sometimes referred to as ultrasonic impact grinding (UIG) or vibration cutting, the UM process …
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The topography of a grinding wheel is composed of the distribution, geometry, and protrusion height of the abrasive grains on the surface. There is no doubt that the topography of a diamond grinding wheel has a great impact on the surface quality and the performance of the ultrasonic vibrations, especially in terms of the …
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Ultra-high strength steel has a wide application of gear transmission systems in the aerospace field, owing to its high hardness, good impact toughness, fracture toughness, etc. Grinding is the important method to guarantee the final quality of ultra-high strength gears. However, the service life of grinding wheels is seriously shortened due …
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This overview covers the evolution of typical hardware systems used to achieve vibratory motions from the one-dimensional UVAM to three-dimensional UVAM, …
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The article shows the general relationship of the tool to the workpiece in ultrasonic machining (impact grinding). The overcut is usually about twice the grit size.
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Ultrasonic machining is a non-conventional mechanical material removal process, which was introduced in 1950 by Kumabe for machining both metallic and non-metallic materials. 32 During the processing, the tool vibration causes the abrasive particles held in the slurry between the tool and workpiece to impact the workpiece surface …
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Ultrasonic vibration-assisted grinding (UAG) is a non-conventional machining process, in which ultrasonic vibration is imposed on the grinding wheel or workpiece [].The superimposition of ultrasonic vibration can improve the grinding performance and the surface quality such as: reducing surface roughness [] and …
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Abstract. In this study, an effort has been made to experimentally explore the possibility for Ultrasonic Impact Grinding (UIG) of pure titanium, using High-Speed Steel (HSS), Tungsten Carbide (WC ...
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In this study, Ultrasonic Surface Rolling Technology is applied to the grinding process of bearing steel. By comparing the effects of four different process combinations, namely coarse grinding, coarse grinding+fine grinding, coarse grinding+USRT, and coarse grinding+fine grinding+USRT, on the surface integrity and wear resistance of …
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1. Introduction. Grinding is a finishing process (Pawlus et al., 2023), which holds a pivotal and widespread position across various domains (Satyanarayana and Nancharaiah, 2018), including the mechanical, automotive, aviation, aerospace, construction, and medical industries.The grinding-induced residual stresses, arise from …
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2.1 Experimental equipment. The equipment utilized in this experiment is a BLOHM Profimat MT-408 precision surface grinding machine, which boasts exceptional cooling capabilities with a flow rate of 90 L/min and pressure of 1.5 MPa, as depicted in Fig. 1.Here, the as-developed ultrasonic vibration system is erected on the worktable (Fig. …
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The ultrasonic-machining process utilizes the plastic deformation of metal for the tool and the brittleness of the workpiece. The tool vibrates and pushes down on the abrasive slurry containing grains until the grains impact the brittle workpiece. During this operation, the workpiece is broken down while the tool bends very slightly.
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The surface topography steadily improves during the grinding process as the grinding wheel speed increases. However, the feed speed and grinding depth have a reverse impact. ... Under ultrasonic high-frequency impact, the 0° fiber is truncated into a multiple-segment short fiber, which prevents the crack from spreading in the fiber …
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The impact process caused the surface crack to expand to the interior, more energy of UV was utilized and the surface material became easier to remove; hence, the effect of the impact was improved. ... We have investigated the machining mechanism of sapphire grinding using the ultrasonic vibration-assisted grinding technology.
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In this study, laser ablation assisted ultrasonic grinding (LAAUG) process was proposed. The high efficiency of laser ablation and high quality of ultrasonic grinding were effectively combined. ... The wear mechanisms of reaction bonded silicon carbide under abrasive polishing and slurry jet impact conditions. Wear, 410-411 (2018), pp. 156 …
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The kinematic of axial ultrasonic vibration-assisted grinding, represented by the single grit movement schematic, is illustrated in Fig. 1.The workpiece moves horizontally with a speed of v w (mm/min). Simultaneously, ultrasonic waves with a frequency f (kHz) and amplitude A (µm) are applied in the axial direction of the grinding …
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This rotary motion of the tool causes the grinding process to impact simultaneously with micro chipping action of the ultrasonic process resulting in higher machining quality and MRR [18], [19]. The hybrid process has a tool impregnated with diamond abrasive, eliminating the need for abrasive slurry, which vibrates and is fed with …
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The process is configured into two main types (Fig. 1a–b) depending upon how the force is transferred from the vibrating tool to the work surface.If the transfer of vibration energy is achieved by introducing a liquid containing abrasive grits in the gap between the tool and work surface, the process is called "ultrasonic impact grinding" or simply "ultrasonic …
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The ultrasonic machining (USM) process consists of two methods, namely, ultrasonic impact grinding and rotary USM. This article lists the major ultrasonic components that …
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The most of researches on ultrasonic assisted grinding process show a reduction in workpiece surface finish and improvement in thermal damage/grinding burn, as well as notable reductions in grinding forces (∼30–70%) (Tawakoli and Azarhoushang, 2008b). It is used for machining of both ductile and brittle materials.
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Ultrasonic assisted grinding (UAG) is an efficient machining process to improve the quality of finished surface for hard-brittle materials. In this study, comparison tests between UAG and CG with single grain were designed and the grinding force, specific grinding energy, material removal rate, surface and subsurface morphology, …
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This study proposes the mechanism of two-dimensional ultrasonic assisted grinding- electrolysis-discharge generating machining (2UG-E-DM). It analyzed the influence of vibration directions on grinding characteristics and surface morphology through the motion simulation of an abrasive. Comparative experiments with different vibration …
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The machining effect of ultrasonic vibration-assisted up/down grinding with different process parameters was investigated by Li et al. [15] The findings demonstrated that the implementation of UV led to a noteworthy decrease in the grinding forces for both grinding techniques. With the increase of UA, the toughness area of the two machined ...
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With ultrasonic machining, a tool creates vibrations that project micro-sized particles towards the workpiece. The particles are typically mixed with water or other liquids to create a slurry. When the ultrasonic tool is activated, it projects these particles at a fast rate of speed towards the workpiece's surface.
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Ultrasonic milling is especially suited to process micron-size and nano-size materials, such as ceramics, alumina trihydrate, barium sulphate, calcium carbonate and metal oxides. The tables below show microscopic …
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1. Introduction. Nickel-based superalloy Inconel 718 has become an important material for manufacturing strategic products such as aircraft engines and gas turbines due to its excellent high-temperature mechanical properties [1].However, the difficult machining characteristics of Inconel 718 affect its forming process and …
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The normal grinding force was increased by 5.1–14.8%, and the grinding temperature was reduced by 37.2% under the radial ultrasonic vibration–assisted grinding process. In addition, it also can facilitate the transverse expansion of cracks within the reinforcing particles and promotes microfracture behavior, leading to a significant ...
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The ultrasonic vibration time n indicates the impact times of one individual abrasive grain into workpiece surface from cutting-in to cutting-out the grinding zone, as calculated as follows: (1) Δ t = 1 v s a p d s (2) n = Δ t T ′ = a p d s v s T ′ where Δ t is the time required from cutting-in to cutting-out grinding zone, T′ is the ...
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The studies show that the superposition of ultrasonic vibration into the grinding process increases the material removal of each grain. Additionally, it was found that the impact action of ultrasonic-assisted grinding induces chipping around the produced scratch. Tawakoli et al. [92] SiC
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The impact force arising out of the vibration of the tool end and the flow of slurry through the work-tool interface actually causes thousands of microscopic grains to remove the work material by abrasion. ... Analysis of the mechanism of material removal by the USM process indicates that it may sometimes be called Ultrasonic Grinding (USG ...
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Grinding forces are an important index to evaluate the difficulty of material removal and machining performance, which can reflect the state of the grinding tool in the grinding process. Grinding temperature has a critical impact on the surface integrity of the workpiece and is increasingly becoming a key constraint to further improvements in ...
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An overview of the influence of ultrasonic vibration machining on the machining properties of SiCp/Al composites is presented in this study, covering different …
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The RUAM processes of today can be traced back to the first ideation of the use of ultrasonic energy for material removal by Wood and Loomis [] in 1927.The team applied ultrasonic vibrations to a machining tool at high frequency (around 70 kHz) onto a glass rod to remove material from glass using grinding grit, which showed that this …
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High-efficiency precision grinding can shorten the machining cycle of aspheric optical elements by a factor of 2–10. To achieve this objective, ultrasonic vibration (UV)–assisted grinding (UVG) has been increasingly applied to manufacture aspheric optics. However, the mechanisms of material removal and surface formation in UV …
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