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Letteratura scientifica selezionata sul tema "HELICAL ABRASIVE FLOW"

Autore: Grafiati

Pubblicato: 11 settembre 2023

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Articoli di riviste sul tema "HELICAL ABRASIVE FLOW"

Wang, A. Cheng, Kuan Yu Chen, Ken Chuan Cheng e H. H. Chiu. "Elucidating the Effects of Helical Passageways in Abrasive Flow Machining". Advanced Materials Research 264-265 (giugno 2011): 1862–67. http://dx.doi.org/10.4028/www.scientific.net/amr.264-265.1862.

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Conventional AFM have difficulty achieving uniform roughness of an axial distribution in circular hole polishing due to limited unitary axial motion of abrasive media. Therefore, this work develops mechanism designs for different passageways to obtain multiple flowing paths of an abrasive medium, whose flowing behavior enhances polishing effectiveness by increasing the abrasive surface area and radial shear forces. The motion of the abrasive medium is studied by utilizing the design of the mold cores, which mold shapes include the circular passageway and helical passageway. The optimum design of the different passageways is then verified using CFD-ACE+ numerical software. Analytical results indicate that the optimum design is the mechanism with a passageway of six helices. Furthermore, surface roughness measurements demonstrate the increase in uniformity and the roughness improvement rate (RIR). Experimental results for surface roughness indicate that roughness deviation of six helices passageway of approximately 0.1001 m Ra is significantly better than those on a circular passageway of around 0.1760 m Ra. Additionally, the six helices passageway is also superior to circular passageway in reducing roughness improvement rate (RIR) by roughly 85% compared with RIR 75% for the circular passageway.

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Xu, Yong Chao, Ke Hua Zhang, Shuang Lu e Zhi Qiang Liu. "Experimental Investigations into Abrasive Flow Machining of Helical Gear". Key Engineering Materials 546 (marzo 2013): 65–69. http://dx.doi.org/10.4028/www.scientific.net/kem.546.65.

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Abstract. Abrasive flow machining (AFM) is an effective method that uses the flow of a pressurized abrasive media for removing workpiece material. It is used to deburring, polishing or radiusing, etc. In this paper, the effect that AFM process on the surface of the helical gear is investigated. Then, the distribution of the velocities, shear rates and shear forces of the abrasive flow on the helical gear surface is obtained by CFD module of the COMSOL Multiphysics software. The simulation results show that the abrasive grains near the addendum, tooth surface and tooth root can be subjected to corresponding shear stress. Experimental results indicated that the surface roughness Ra of the left tooth surface, right tooth surface and addendum before processing 1.429um, 1.108um and 2.732um dropped after processing 0.228um, 0.216um and 1.754um. All burrs at the intersection between tooth surface and end surface has been cleared, the surface quality of the helical gear has been improved. Therefore, AFM method can improve the surface quality of the helical gear effectively.

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Wang, A. Cheng, Ken Chuan Cheng, Kuan Yu Chen e Yan Cherng Lin. "Finishing Performance of the Abrasive Flow Machining in Complex Holes by Using Helical Cores". Key Engineering Materials 831 (febbraio 2020): 52–56. http://dx.doi.org/10.4028/www.scientific.net/kem.831.52.

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Since abrasive gels with single direction motion are very difficulty to achieve the smooth surfaces in the complex holes finishing during abrasive flow machining (AFM), therefore, the helical cores were proposed here to create the multiple motions of abrasive gels to get the even surface of the complex holes in AFM. The results showed that helical core with 5 spiral grooves and narrow gap between the core tip and the hole could obtain the even surface and fine surface roughness after AMF.

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Cheng, Ken Chuan, Kuan Yu Chen, A. Cheng Wang e Yan Cherng Lin. "Study the Rheological Properties of Abrasive Gel with Various Passageways in Abrasive Flow Machining". Advanced Materials Research 126-128 (agosto 2010): 447–56. http://dx.doi.org/10.4028/www.scientific.net/amr.126-128.447.

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Abstract (sommario):

Abrasive flow machining (AFM) is a simple and efficient method to remove recasting layers making by wire electrical discharge machining (WEDM). However, conventional AFM methods have difficulty achieving uniform roughness of an axial distribution in circular hole polishing due to limited unitary axial motion of abrasive media. Therefore, this work develops mechanism designs for different passageways to obtain multiple flowing paths of abrasive medium, whose flowing behavior enhances polishing effectiveness by increasing the abrasive surface area and radial shear forces. The motion of the abrasive medium is studied by utilizing different mold cores, which mold shapes include the circular, hollow and helical passageway. The optimum design of the passageways is then verified using CFD-ACE+ software, numerical results indicate that passageway with six helices performed better in the uniform surface roughness than others’ do. Experimental results show that roughness deviation of six helices passageway of approximately 0.100 m Ra is significantly better than those on a circular passageway of around 0.1760 m Ra. Additionally, the six helices passageway is also superior to circular passageway in reducing roughness improvement rate (RIR) by roughly 87% compared with RIR 67.7% for the circular passageway.

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Kumar, Rahul, Qasim Murtaza e R. S. Walia. "Three Start Helical Abrasive Flow Machining For Ductile Materials". Procedia Materials Science 6 (2014): 1884–90. http://dx.doi.org/10.1016/j.mspro.2014.07.220.

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Brar, B. S., R. S. Walia, V. P. Singh e M. Sharma. "A Robust Helical Abrasive Flow Machining (HLX-AFM) Process". Journal of The Institution of Engineers (India): Series C 94, n. 1 (gennaio 2013): 21–29. http://dx.doi.org/10.1007/s40032-012-0054-9.

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Li, Junye, Shangfu Zhu, Jinbao Zhu, Chengyu Xu, Hengfu Zhang, Guangfeng Shi, Weihong Zhao e Jianhe Liu. "Quality prediction of polygonal helical curved tube by abrasive flow precision machining". International Journal of Advanced Manufacturing Technology 119, n. 1-2 (9 novembre 2021): 827–39. http://dx.doi.org/10.1007/s00170-021-07984-6.

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Butola, Ravi, Qasim Murtaza, R. S. Walia e Pradeep kumar. "Two start and Three Start Helical Abrasive Flow Machining for Brittle Materials". Materials Today: Proceedings 4, n. 2 (2017): 3685–93. http://dx.doi.org/10.1016/j.matpr.2017.02.263.

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Wang, A. Cheng, Ken Chuan Cheng, Kuan Yu Chen e Yan-Cherng Lin. "Enhancing the Surface Precision for the Helical Passageways in Abrasive Flow Machining". Materials and Manufacturing Processes 29, n. 2 (febbraio 2014): 153–59. http://dx.doi.org/10.1080/10426914.2013.852204.

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Wang, A. Cheng, Ken Chuan Cheng, Kuan Yu Chen e Cheng Chin Chien. "Elucidating the optimal parameters of a helical passageway in abrasive flow machining". International Journal of Surface Science and Engineering 9, n. 2/3 (2015): 145. http://dx.doi.org/10.1504/ijsurfse.2015.068239.

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Più fonti

Tesi sul tema "HELICAL ABRASIVE FLOW"

Hsieh, Yu-Chi, e 謝育齊. "Study on the Effects of Helical Passageways in Abrasive Flow Machining". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/17756689594138493100.

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Abstract (sommario):

碩士
清雲科技大學
機械工程所
99
Abrasive Flow Machining(AFM) is a efficient method of surface polishing, especially it can quickly remove recasting layers which made by wire electrical discharge machining (WEDM). However, AFM methods have difficulty achieving uniform roughness of an axial distribution in circular hole polishing due to limited unitary axial motion of abrasive media. Therefore, this study design a special mechanism of the helical flow passageway to perform multiple flowing paths of an abrasive medium, then the fluid produced in the polishing of multi-directional path to achieve the purposes of uniform polishing. For this investigation, we consider the comparisons both simulation and experiment method. Above all, CFD-ACE+ numerical software was used in the simulation of abrasive flow in the helical mold core to understand the behaviors of abrasive velocity distribution and shear strain rate changes. Analytical results indicate that the design of helical passageway will obviously produce multi-directional flowing path, and we can infer it effectively improve the axial uniformity of surface roughness by the deviation of shear strain rate changes. Finally, Experiment proceeding designed a variety consists of different type and different size of mold cores to verify the effectiveness of helical passageway in AFM polishing, such as the number of helical grooves, the gap between work-piece surface and helical edge, the thickness of helical slot and the number of turns. Based on the experiment results, it showed that the helical passageway is superior to circular passageway in reducing roughness improvement rate (RIR) by roughly 76% compared with RIR 61% for the circular passageway, which design conditions including for four helices groove, 0.5 mm gap, 0.5 mm thickness of helical slot and one helical turn.

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Lin, Min-Han, e 林明翰. "Effect of Helical Passageway in the Polygon Hole Using Abrasive Flow Machining". Thesis, 2008. http://ndltd.ncl.edu.tw/handle/99159093801635307437.

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Abstract (sommario):

碩士
清雲科技大學
機械工程研究所
96
Abrasive flow machining (AFM) is a simple and efficiency polishing method. But it is difficult to get the uniform roughness in the polygon hole polishing, due to the axial movement of the abrasive medium in the working process. Therefore, helical cores with different shape are put in the hole to form various channels that change the mechanism of AFM form the simple axial motion to the multiple directions. Computational fluid dynamics (CFD) software was used here to simulate the motion of abrasive medium in the polygon holes. Velocity and strain rate of the abrasive medium in the channels were obtained by simulations to design the passageway that uniform roughness could be found. Simulation results shown that the abrasive medium would produce irregular variances by placing helical core in the polygon hole. That is to say the media have the motion with different directions. And in experimental results, the surface roughness could be uniformity when polygon hole close to circular.

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PANWAR, MANSI. "EXPERIMENTAL INVESTIGATION OF HELICAL ABRASIVE FLOW MACHINE SETUP FOR DIFFERENT TYPES OF WORKPIECE MATERIAL". Thesis, 2016. http://dspace.dtu.ac.in:8080/jspui/handle/repository/14771.

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Abstract (sommario):

Abrasive flow machining (AFM), also known as abrasive flow deburring or extrude honing, is an interior surface finishing process characterized by flowing an abrasive -laden fluid through a work piece. During the study different medias, workpieces and pressure ranges were chosen. These fluids are typically very viscous, having the different plasticizers. AFM smoothens and decreases surfaces roughness, and is specifically used to remove burrs; polish surfaces form radii, and even remove material. These experiments were conducted between aluminium, brass, mild steel at a range of 10, 15, 20Mpa. When an abrasive mixed with a polymer of special rheological properties and forced through a restricting medium, the abrasive and polymer will act as a self-forming tool that precisely removes work piece material and improve the surface finish at those areas restricting to the medium flow. Different relationships between a number of sets of workpiece, media and pressure are obtained using TAGUCHI method and their analysis was performed over ANOVA technique. Styrene butadiene rubber which is the most common natural rubber has given improved outputs among other media. In the % improvement in the roughness came out to be 39.51% and 3.21mg for material removal analysis.

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Atti di convegni sul tema "HELICAL ABRASIVE FLOW"

Sharma, Dipti, Kamal K.Kar e J. Ramkumar. "Finishing of helical gears using abrasive flow finishing". In Proceedings of the International Conference on Nanotechnology for Better Living. Singapore: Research Publishing Services, 2016. http://dx.doi.org/10.3850/978-981-09-7519-7nbl16-rps-100.

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Brar, B. S., R. S. Walia, V. P. Singh e P. Singh. "Effects of Helical Rod Profiles in Helical Abrasive Flow Machining (HLX-AFM) Process". In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-53711.

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Abrasive flow machining (AFM) process is a fine finishing process employing abrasive laden self modulating putty for the finishing of mainly internal recesses. Though the AFM is suitable for the finishing of internal cavities, but the material removal is very low during this finishing process. Helical abrasive flow machining (HLX-AFM) has been recently developed to improve the machining efficiency of AFM process. This process employs a coaxially fixed helical twist drill-bit during the extrusion of the abrasive laden media through an internal cylindrical recess. The presence of a fixed drill-bit inside a cylindrical cavity of the work-piece results in considerable increase in material removal and improvement in surface finish. In the present investigation, the same HLX-AFM setup has been used and the effects of two more helical profile rods viz. a 3-start helical profile and a spline have been studied along with the helical twist drill-bit for improving the quality characteristics of material removal and percentage improvement in the surface roughness during the fine finishing of internal cylindrical surface of brass work-pieces. The experiments were planned according to L9 orthogonal array of Taguchi method and the optimal process parameters were selected. The employment of a rod with six splines and a 3-start helical profile results in improved finishing in comparison to the drill-bit profile, due to the presence of more number of flutes and grooves on the coaxially held stationary rods. The helical profile type has 3.75% contribution towards the percentage improvement in the surface roughness, but is not significant in affecting material removal. The presence of 3-start helical profile led to 61.40% improvement in surface roughness (from Ra - 1.3 μm to 0.5 μm) at optimal level with no effect on material removal, which means no extra machining is taking place. The parameter of abrasive-to-media concentration ratio (varying from 0.75 to 1.25) is the most contributing factor with 85.90% contribution toward suface finish improvement and 71.71% contribution towards material removal. The finishing performance of 3-start profile is 15% better than the standard helical drill-bit with no increase in the operating pressures. SEM micrographs corroborated the fact that 3-start profile led to more number of light abrasive cutting grooves and thus more surface finish. HLX-AFM with 3-start helical profile rods can be employed for the finishing, form corrections of internal cylindrical cavities of any size. Presence of the profile rod results in increase in the reduction ratio and thus more machining action. The developed process can also generate cross-hatch lay pattern on internal cylindrical surfaces.

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Cheng, Ken-Chuan, Hsin-Min Lee, A.-Cheng Wang e Yan-Cherng Lin. "Study of the optimal helical passageways in complex-hole polishing by abrasive flow machining". In 2017 International Conference on Applied System Innovation (ICASI). IEEE, 2017. http://dx.doi.org/10.1109/icasi.2017.7988255.

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Zhang, K., e D. Z. Wu. "Research on the Solid-Liquid Two-Phase Flow in a Helical Groove Seal". In ASME 2018 5th Joint US-European Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/fedsm2018-83105.

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Abstract (sommario):

Hydraulic machinery is widely used in delivering solid-liquid mixing medium. The abrasion and destruction caused by sediment particles occurs on the contact interface between the contacting seal elements, which has a considerable influence on the operational stability and safety. Helical groove seal is a type of non-contacting dynamic seal. Relied on the reversed pressure produced by the rotary sealing element, the helical groove seal could reduce or prevent the leakage. Such seal has a good performance even if there is a big clearance between the sealing elements, so helical groove seal has its unique advantage on solid-liquid mixing medium. However, the study of helical groove seal on solid-liquid mixing flow is very poor. In this paper, the certain conception and theoretical study of helical groove seal was introduced. With the commercial software FLUENT, the 3D internal flow of the seal was presented by using multiphase flow model. Based on the method of single variable model, the seals with different helical parameters were calculated to compare the characteristics of solid-liquid two phases flow in helical groove seals with different parameters, for example, the clearance and spiral groove depth. By this way, the relationship between structure and performance of particles-mixed helical groove seals is showed clearly, then the results can be used for design of helical groove seal structure.

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Chen, Yi, Abhay Patil, Yiming Chen, Gerald Morrison e Marisela Rojas. "An Experimental Investigation on the Erosion of a Helico-Axial Pump With Gas Presence". In ASME 2020 Fluids Engineering Division Summer Meeting collocated with the ASME 2020 Heat Transfer Summer Conference and the ASME 2020 18th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/fedsm2020-20481.

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Abstract Electrical submersible pump (ESP) technology has been widely applied in the oil and gas industry due to its high productivity. However, erosion always causes the reduction of productivity and sometimes even the failure of an ESP system. This study explores the effect of gas presence on erosion mechanism on an ESP which is composed of 4 stages of Helico-Axial Pump (HAP). A 200-hour erosion test has been performed on this ESP. During the test, the ESP was running at 3600 RPM with a liquid flow rate of 880 GPM, 20% inlet Gas Volume Fraction (GVF), and 0.24% sand concentration by weight. Performance tests were conducted every 50 hours to acquire the performance maps and monitor the performance degradation. Analysis of volume/weight loss and performance degradation is conducted to investigate pump wear. Two types of erosion are found at the impeller: the volume loss found notably at the leading edge is mainly caused by two-body impact erosion, while the tip clearance increment between the impeller housing and impeller blade tip is mainly caused by the three-body abrasive erosion. Unlike most conventional centrifugal pumps, there is no observable wear found at the trailing edge of the impeller. The presence of the gas shows a negative effect on both types of erosion. The consequence of the erosion is the performance degradation, especially at the condition with higher pressure rise. It is suggested to apply this HAP in the oil field with more gas and higher bottom hole pressure.

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