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Assisted Machining Technologies
Published in Helmi Youssef, Hassan El-Hofy, Non-Traditional and Advanced Machining Technologies, 2020
Some advanced abrasion processes combine a magnetic field together with the abrasion action as in the case of magnetic abrasive machining (MAF), magnetic float polishing (MFP), magnetorheological finishing (MRF), and magnetorheological abrasive flow finishing (MRAFF). Non-conventional machining is also assisted by mechanical vibrations at low or ultrasonic frequency and small amplitudes in VA-ECM, VA-EDM, and VA-AWJM in order to improve their performance. Figure 7.1 shows the different assisted machining processes by thermal, vibration, and magnetic field.
Lightweight Mirror Design
Published in Anees Ahmad, Handbook of Optomechanical Engineering, 2017
One method for reducing quilting is local polishing of the facesheet above each cell. Polishing is normally done by hand. Although tedious, hand polishing of lightweight sandwich mirrors has been successful even on very large mirrors. Recently, a new polishing technology, magnetorheological finishing (MRF), offers the potential of greatly reducing quilting with relatively short fabrication times.47 Quilting was reduced from 45 to 2.5 nm on a test mirror by the use of MRF.48
Effects of ultrasonic amplitude on sapphire ultrasonic vibration assisted chemical mechanical polishing by experimental and CFD method
Published in Mechanics of Advanced Materials and Structures, 2022
Mufang Zhou, Min Zhong, Wenhu Xu
Sapphire possesses excellent physical and chemical properties such as erosion resistance, thermal shock resistance, and high hardness [1]. It is widely accepted in aircraft fairings, integrated circuits, and semiconductor lighting. Dramatically, light-emitting diodes (LEDs), made from sapphire as the substrate, have been generally used all over the world [2–6]. The application of sapphire requires high surface quality [7], so the polishing process is regarded as extremely important [8, 9]. At present, surface planarization technologies generally include abrasive flow polishing (AFP), magnetorheological finishing (MRF), laser polishing (LP), chemical mechanical polishing (CMP), and other types [10–13]. While CMP is one of the most mainly applied and established technologies in the field of sapphire polishing [14], the first three polishing technologies have their limitations in terms of material applicability, processing efficiency, and processing quality [15–17].
Surface properties and biocompatibility studies on bone plate by magnetorheological finishing
Published in Surface Engineering, 2022
Atul Singh Rajput, Manas Das, Sajan Kapil
The surface quality of a biomaterial is one of the crucial parameters in determining its interaction with the surrounding environment of body fluid. The poor surface quality of the biomaterials increases the chances of bacterial adherence, reducing its sustainability. In recent decades, various surface finishing processes have been evolved for the enhancement of bone plate surface characteristics, including Vibratory Polishing (VP) [1], Electron Beam (EB) polishing [2], Laser Beam (LB) polishing [3], Magnetorheological Finishing (MRF) [4], chemical etching [5], burnishing [6], Abrasive Water Jet Machining (AWJM) [7], etc. However, controlling the surface quality during the VP, chemical etching, and burnishing is unattainable. Also, residual stress generation during energy-based polishing techniques is a few limitations associated with these recently developed surface finishing techniques. Furthermore, the impact of cryogenic materials on surface quality during face milling [8], optimization of the process parameters [9], and ultrasonic assistance [10] during the machining are a few methods adopted to improve the finishing efficiency.
Improved magnetorheological finishing process with arc magnet for borosilicate glass
Published in Materials and Manufacturing Processes, 2022
Xulong Zhuang, Mingming Lu, Jiakang Zhou, Jieqiong Lin, Weixing Li
In the horizontal rotation-based planar magnetorheological finishing process, the traditional magnetorheological polishing process has low polishing efficiency, the traditional cluster magnetorheological polishing process can effectively improve the polishing efficiency but the linear velocity distribution is uneven. Therefore, a new type of arc-shaped permanent magnet is designed, combined with the clustering mechanism, and combined with the reciprocating motion of the workpiece. The new processing technology not only increases the polishing area, but also reduces the impact of uneven linear speed, ensuring the flatness and surface accuracy of the workpiece surface. In addition, the feasibility of optical glass processing was evaluated by analyzing the surface morphology and surface profile of borosilicate glass (K9 glass).