Abrasive Water Jet Polishing on Zr-Based Bulk Metallic Glass

2012 ◽  
Vol 579 ◽  
pp. 211-218 ◽  
Author(s):  
Pham Huu Loc ◽  
Fang Jung Shiou
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Impact Angle ◽  
Water Jet ◽  
Standoff Distance ◽  
Hydraulic Pressure ◽  
Abrasive Water Jet ◽  
Optimal Parameters ◽  
Abrasive Material ◽  
The Impact

This study investigates the optimal abrasive water jet polishing parameters for Zr-based bulk metallic glass (BMG) material by using the Taguchi method. An abrasive water jet polishing (AWJP) system is newly designed and mounted on a machining center. In order to determine the optimal polishing parameters for the Zr-based BMG sample, six polishing parameters, namely the hydraulic pressure, the impact angle, the standoff distance, the abrasive material, the abrasive concentration, and the polishing time, are chosen as the control factors of experiments. The optimal AWJP parameters are determined after carrying out the experiments based on the Taguchi’s L18 orthogonal array experimental results. These optimal parameters are the combination of the hydraulic pressure of 2 kg/cm2, the impact angle of 30o, the standoff distance of 15 mm, the abrasive material of SiC, the abrasive concentration of 1:5, and the polishing time of 60 minutes. The surface roughness is improved from an initial value of Ra = 0.675μm to a final value of Ra = 0.016μm by using the AWJP optimal parameters.

Investigation of Optimal Air-Driving Fluid Jet Polishing Parameters for the Surface Finish of N-BK7 Optical Glass

2013 ◽  
Vol 135 (1) ◽  
Author(s):  
Pham Huu Loc ◽  
Fang-Jung Shiou ◽  
Zong-Ru Yu ◽  
Wei-Yao Hsu
Keyword(s):  
Surface Roughness ◽  
Surface Finish ◽  
Orthogonal Array ◽  
Optical Glass ◽  
Impact Angle ◽  
Air Pressure ◽  
Standoff Distance ◽  
Optimal Parameters ◽  
Abrasive Material ◽  
Spherical Lens

The aim of this study is to investigate optimal air-driving fluid jet polishing (FJP) parameters by using Taguchi's method to improve surface roughness of N-BK7 optical glass on a machining center. An orthogonal array and the signal-to-noise (S/N) ratio are employed to determinate the optimal polishing parameters, and analysis of variance (ANOVA) is used to identify the main parameters that affect the surface roughness of the N-BK7 optical glass. An air-driving FJP tool is newly designed and fabricated to conduct experiments. To determinate the optimal air-driving FJP parameters, six polishing parameters, namely air pressure, impact angle, standoff distance, the abrasive material, abrasive concentration, and polishing time, are selected as the control factors of experiments. Based on the Taguchi's L18 orthogonal array experimental results and the S/N ratio, the optimal parameters for the N-BK7 optical glass are found. These optimal parameters are to be as follows: an air pressure of 0.490 MPa, an impact angle of 40 deg, a standoff distance of 12 mm, the abrasive material of Al2O3, an abrasive concentration of 10 wt. %, and a polishing time of 30 min. The surface roughness of specimen is improved from Ra = 0.350 μm–0.032 μm by using the optimal air-driving FJP parameters. In addition, the determined optimal polishing parameters for the plane surface are applied to the surface finish of an N-BK7 spherical lens, and the surface roughness of the spherical lens can be improved from Ra = 0.421 μm to 0.202 μm within an area of 283.6 μm × 200 μm.

Research on High Pressure Abrasive Water Jet for Cold Rolling Descaling

2012 ◽  
Vol 572 ◽  
pp. 31-36 ◽  
Author(s):  
Xiao Chen Wang ◽  
Ze Wei Mao ◽  
Quan Yang
Keyword(s):  
High Pressure ◽  
Abrasive Particle ◽  
Impact Angle ◽  
Water Jet ◽  
Optimal Selection ◽  
Abrasive Water Jet ◽  
Abrasive Material ◽  
Geometry Model ◽  
Simulation Results ◽  
Selection Of

This paper expatiated on principles of high pressure abrasive water jet descaling; used GAMBIT and some experience parameters to create the geometry model of the nozzles and the outflow field; used Fluent to simulate the high pressure abrasive water jet under the condition of different jet standoff distance, different impact angle, different mix angle, different abrasive particle size, different abrasive concentration and different abrasive material. Through the analysis of the simulation results, this paper put forward the optimal selection of these parameters.

scholarly journals Analysis and modeling of the effects of process parameters on specific cutting energy in abrasive water jet cutting

2018 ◽  
Vol 22 (Suppl. 5) ◽  
pp. 1459-1470 ◽  
Author(s):  
Predrag Jankovic ◽  
Milos Madic ◽  
Dusan Petkovic ◽  
Miroslav Radovanovic
Keyword(s):  
Mathematical Model ◽  
Process Parameters ◽  
Water Jet ◽  
Abrasive Water Jet ◽  
Specific Cutting Energy ◽  
Important Indicator ◽  
Cutting Energy ◽  
Water Jet Cutting ◽  
Abrasive Water Jet Cutting ◽  
The Impact

The problem of cutting difficult-to-machine materials used in the aerospace industry, aircraft industry, and automobile industry, led to the development and application one of today?s most attractive technology for contour cutting - abrasive water jet cutting. For the efficient use of abrasive water jet cutting, it is of great importance to analyze the impact of process parameters on performance indicators, such as cutting quality, productivity, and costs. But also, from the energy utilization point of view, it is very important to analyze the impact of these parameters on the specific cutting energy which represents the amount of energy spent on the removal of material in the unit time. Having this in mind, this study presents the experimental results of abrasive water jet cutting of aluminum alloy with the aim of creating a mathematical model for estimating specific cutting energy as an important indicator of the degree of utilization of the available energy in the cutting process. The mathematical model of the specific cutting energy is explicitly represented as a non-linear function of the process parameters, obtained by the artificial neural network.

Influence of Abrasive Materials in Fluidised Bed Machining of AlSi10Mg Parts Made through Selective Laser Melting Technology

2019 ◽  
Vol 813 ◽  
pp. 129-134 ◽  
Author(s):  
Andrea El Hassanin ◽  
Maurizio Troiano ◽  
Alessia Teresa Silvestri ◽  
Vincenzo Contaldi ◽  
Fabio Scherillo ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Selective Laser Melting ◽  
Impact Angle ◽  
Fluidised Bed ◽  
Laser Melting ◽  
Abrasive Material ◽  
Melting Technology ◽  
Post Process ◽  
The Impact ◽  
Complex Parts

Metal Additive Manufacturing technologies development is increasing in a remarkable way due to their great potential concerning the production of complex parts with tailored characteristics in terms of design, material properties, usage and applications. Among all, the most widespread technologies are the Powder Bed Fusion based technologies such as Selective Laser Melting and Electron Beam Melting. However, the high surface roughness of the as-built parts still represents one of the major limitations, making necessary the adoption of post-process finishing to match the technological requirements for most of the fields of application. In this scenario, Fluidised Bed Machining represents an emerging finishing technology that could overcome some of the limitations of the most common methods, especially in terms of feasibility for the treatment of complex parts thanks to the fluid-like mobility of the abrasive material. This work deals with the preliminary tests of the Fluidised Bed Machining of additive manufactured samples using alumina as the abrasive material, investigating the effects of a high abrasive/substrate hardness ratio condition. The experiments were carried out on small plates of AlSi10Mg alloy made through Selective Laser Melting technology, built in the vertical direction with respect to the building plate. The influence of the impact angle and treatment time were investigated under bubbling fluidization conditions. Surface morphology evaluations were carried out pre and post process by means of Confocal Microscopy and Scanning Electron Microscopy (SEM). Weight loss measurements were conducted to evaluate the material removal rates as well. Results show a small influence of the specific impact angle, a slight reduction of the surface roughness and an asymmetrical effect of treatment, acting mostly on the sintered powders forming the peaks of the as-built surface.

scholarly journals Effect of Abrasive Concentration on Impact Performance of Abrasive Water Jet Crushing Concrete

2019 ◽  
Vol 2019 ◽  
pp. 1-18
Author(s):  
Xiaohui Liu ◽  
Ping Tang ◽  
Qi Geng ◽  
Xuebin Wang
Keyword(s):  
Internal Energy ◽  
Impact Force ◽  
Abrasive Particle ◽  
Water Jet ◽  
Abrasive Water Jet ◽  
Sph Method ◽  
Impact Performance ◽  
Water Jets ◽  
The Impact ◽  
Peak Impact Force

It has been found that the impact performance of water jets can be changed by its properties, which include pressure, additive, and mode of jet. Thus, an abrasive water jet (AWJ) has been developed as a new method. However, there is little research on the effect of abrasive concentration on the impact performance of abrasive jets. Thus, the SPH method is used to establish an abrasive water jet crushing concrete model to study the effect of abrasive concentration on the impact force, concrete internal energy, abrasive particle distribution, crushing depth, and damage and crushing efficiencies under different concrete compressive strengths and abrasive densities. The results indicate that there is little effect of the abrasive concentration on the peak impact force under different compressive strengths and abrasive densities, while the mean impact force tends to increase linearly with the abrasive concentration. The internal energy of the concrete increases stepwise with the abrasive concentration under different compressive strengths and abrasive densities. The concentration of 10%∼20% is the rapid increasing stage. The crushing depth and damage efficiencies are all maximum at a concentration of 20% under different compressive strengths and abrasive densities. After the concrete was impacted by the water from the water jet, it is divided into rebounding particles and intrusive particles. The more the intrusive particles, the easier the concrete to be crushed and damaged.

Effect of crystallinity on the impact toughness of a La-based bulk metallic glass

2000 ◽  
Vol 48 (10) ◽  
pp. 2603-2615 ◽  
Author(s):  
N Nagendra ◽  
U Ramamurty ◽  
T.T Goh ◽  
Y Li
Keyword(s):  
Impact Toughness ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
The Impact

Vibration and Experimental Comparison of Machining Process

2015 ◽  
Vol 669 ◽  
pp. 179-186 ◽  
Author(s):  
Anton Panda ◽  
Marek Prislupčák ◽  
Jozef Jurko ◽  
Iveta Pandová ◽  
Peter Orendáč
Keyword(s):  
Water Jet ◽  
Machining Process ◽  
Experimental Comparison ◽  
Abrasive Water Jet ◽  
Technological Parameters ◽  
Microsoft Excel ◽  
Frequency Spectra ◽  
Acceleration Amplitude ◽  
The Impact ◽  
The Given

Abrasive water jet technology is among the unconventional ways of machining. In today's modern and progressive era is often used for cutting and machining of various types of materials because of lower costs and environmental impact, as the cutting tool is water, in our case, with the addition of abrasives. Objective of the measurements was to evaluate the impact of vibration on the technological head in abrasive water jet technology in changing the selected technological parameters and the flow rate of technological head. In the given experiment, the used material - steel Hardox 500 with a thickness of 10 mm. The effort was to investigate the effects of changes in the speed rate of technological head (by speeds - 40, 200, 400 mm / min) on the size of the vibration acceleration amplitude and its frequency. Based on the measured values ​​of vibration to the technological head create the database and from it is evaluated the data in selected softwares (LabVIEW, SignalExpress and Microsoft Excel). Findings and conclusions are formulated on the basis of graphical dependencies, envelopes frequency spectra and comparison chart of envelopes.

Diagnostic and Experimental Valuation on Progressive Machining Unit

2014 ◽  
Vol 616 ◽  
pp. 191-199 ◽  
Author(s):  
Marek Prislupčák ◽  
Anton Panda ◽  
Marek Jančík ◽  
Iveta Pandová ◽  
Peter Orendáč ◽  
...  
Keyword(s):  
Feed Rate ◽  
Water Jet ◽  
Abrasive Water Jet ◽  
Technological Parameters ◽  
Microsoft Excel ◽  
Frequency Spectra ◽  
New Findings ◽  
Acceleration Amplitude ◽  
Vibration Impact ◽  
The Impact

The main effort of each technological process is not only to reduce the costs, but also to reduce the impact on the environment. The technology of abrasive water jet is one of the methods of division and cutting materials with the lowest impact on the environment, since water is the cutting tool, in our case with the addition of an abrasive. The aim of the measurement was the observation (examination) and evaluation of the vibration impact on the technological head in the technology of abrasive water jet when changing the selected technological parameters, namely the feed rate of the technological head. The experiments were carried out on one kind of material - steel HARDOX 500 with a thickness of 10 mm. The impact of the change of the technological head’s feed rate (100, 50, mm/min) on the size of the vibration acceleration amplitude and its frequency were examined. A database was created from the measured vibration values on the technological head and from that database the data was evaluated in selected softwares (LabVIEW, SignalExpress a Microsoft Excel). Graphical dependencies, frequency spectra covers and covers comparison graph were created from which new findings and conclusions were formulated.

Measurement and Analysis of Mass Flow and Feed Speed Impact on Technological Head Vibrations during Cutting Abrasion Resistant Steels with Abrasive Water Jet Technology

2015 ◽  
Vol 669 ◽  
pp. 243-250 ◽  
Author(s):  
Štefánia Salokyová
Keyword(s):  
Mass Flow ◽  
Manufacturing Systems ◽  
Water Jet ◽  
Feed Speed ◽  
Abrasive Water Jet ◽  
Technological Parameters ◽  
Physics Institute ◽  
Technical University ◽  
Manufacturing Technologies ◽  
The Impact

The article presents the results of Technical University in Košice Faculty of Manufacturing Technologies Department of production processes operation and Technical University in Ostrava Physics Institute Liquid jet workplace cooperation in the area of operational states diagnosis of manufacturing systems with abrasive water jet technology (AWJ). Within the operational states diagnostics is the impact of selected technological parameters on technological head vibrations studied. Based on an extensive set of experiments are original graphical dependences determined of the abrasive mass flow and feed speed impact on the vibrations parameter - technological head vibrations acceleration amplitude of manufacturing system with AWJ technology. In addition to the original graphical dependences are in article new knowledge formulated in the area of science and research and recommendations for companies that operates manufacturing systems with AWJ technology.

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