scholarly journals Flexible Abrasive Tools for Deburring and Finishing of Holes in Superalloys

2018 ◽  
Author(s):  
Adrián Rodríguez ◽  
Asier Fernández ◽  
Luís Norberto López de la Calle ◽  
Leonardo Sastoque Pinilla
Keyword(s):  
High Surface ◽  
Value Added ◽  
Surface Finishing ◽  
Manufacturing Sectors ◽  
Complete Study ◽  
Roughness Analysis ◽  
Abrasive Tools ◽  
Edge Finishing ◽  
Finishing Processes ◽  
Machining Operations

Many manufacturing sectors require high surface finishing. After machining operations such as milling or drilling, undesirable burrs or insufficient edge finishing may be generated. For decades, many finishing processes have been handmade-basis; this fact is accentuated when dealing with complex geometries especially for high value-added parts. In recent years, it’s a tendency of trying to automate as far as possible this kind of processes, repeatability and time/money savings are main purposes. Based on that idea, the aim of this work is to check new tools and strategies for finishing aeronautical parts, especially critical engine parts made on Inconel 718, a very ductile nickel alloy. Automating edge finishing of chamfered holes is a complicated but really important goal. In this paper, flexible abrasive tools were used for this purpose. A complete study of different abrasive possibilities was carried out, mainly focusing on roughness analysis and final edge results obtained.

scholarly journals Flexible Abrasive Tools for the Deburring and Finishing of Holes in Superalloys

2018 ◽  
Vol 2 (4) ◽  
pp. 82 ◽  
Author(s):  
Adrián Rodríguez ◽  
Asier Fernández ◽  
Luís López de Lacalle ◽  
Leonardo Sastoque Pinilla
Keyword(s):  
High Surface ◽  
Value Added ◽  
Surface Finishing ◽  
Manufacturing Sectors ◽  
Complete Study ◽  
Roughness Analysis ◽  
Abrasive Tools ◽  
Edge Finishing ◽  
Finishing Processes ◽  
Machining Operations

Many manufacturing sectors require high surface finishing. After machining operations such as milling or drilling, undesirable burrs or insufficient edge finishing may be generated. For decades, many finishing processes have been on a handmade basis; this fact is accentuated when dealing with complex geometries especially for high value-added parts. In recent years, there has been a tendency towards trying to automate these kinds of processes as far as possible, with repeatability and time/money savings being the main purposes. Based on this idea, the aim of this work was to check new tools and strategies for finishing aeronautical parts, especially critical engine parts made from Inconel 718, a very ductile nickel alloy. Automating the edge finishing of chamfered holes is a complicated but very important goal. In this paper, flexible abrasive tools were used for this purpose. A complete study of different abrasive possibilities was carried out, mainly focusing on roughness analysis and the final edge results obtained.

scholarly journals Review of Superfinishing by the Magnetic Abrasive Finishing Process

2017 ◽  
Vol 3 (1) ◽  
Author(s):  
Lida Heng ◽  
Yon Jig Kim ◽  
Sang Don Mun
Keyword(s):  
High Surface ◽  
Processing Parameters ◽  
Engineering Industry ◽  
Advanced Materials ◽  
Surface Finishing ◽  
Magnetic Abrasive Finishing ◽  
Surface Finishes ◽  
Abrasive Finishing ◽  
Recent Developments ◽  
Finishing Processes

AbstractRecent developments in the engineering industry have created a demand for advanced materials with superior mechanical properties and high-quality surface finishes. Some of the conventional finishing methods such as lapping, grinding, honing, and polishing are now being replaced by non-conventional finishing processes. Magnetic Abrasive Finishing (MAF) is a non-conventional superfinishing process in which magnetic abrasive particles interact with a magnetic field in the finishing zone to remove materials to achieve very high surface finishing and deburring simultaneously. In this review paper, the working principles, processing parameters, and current limitations for the MAF process are examined via reviewing important work in the literature. Additionally, future developments of the MAF process are discussed.

scholarly journals Optimization and Rejection Analysis of IC Engine Rocker Arm

2021 ◽  
Vol 9 (8) ◽  
pp. 2036-2044
Author(s):  
Chetan Jadhav
Keyword(s):  
Surface Roughness ◽  
Great Influence ◽  
High Wear Resistance ◽  
Process Stability ◽  
Ic Engine ◽  
Cycle Times ◽  
Roughness Analysis ◽  
Abrasive Tools ◽  
Finishing Processes ◽  
Technical Products

Abstract: Today, many technical products need high-precision cylindrical bores which are used, e.g. as a fit or as guidance elements for pistons and shafts. They often need geometric and form accuracy with tolerances less than 1 μm, surface qualities with a roughness less than 1 μm and a high wear resistance. To reach higher production accuracy and better process stability in shorter cycle times, new approaches for the regulation of an automated honing process have to be developed. Due to the great demands regarding the surface roughness which has a great influence on the service life and reliability of parts and the researches of the technical and economical performances of finishing processes were made to optimize the process parameters and constructive parameters of the abrasive tools Keywords: Surface roughness, Analysis, Honing, process parameter, Rocker arm

scholarly journals Edge finishing of large turbine casings using defined multi-edge and abrasive tools in automated cells

2021 ◽  
Author(s):  
Adrian Rodríguez ◽  
Mikel González ◽  
Octavio Pereira ◽  
L. Norberto López de Lacalle ◽  
Mikel Esparta
Keyword(s):  
Operating Time ◽  
Added Value ◽  
Global Challenge ◽  
Industrial Sectors ◽  
Finishing Process ◽  
Aero Engine ◽  
Edge Location ◽  
Abrasive Tools ◽  
Edge Finishing ◽  
Finishing Processes

AbstractAutomate finishing processes is a global challenge in several industrial sectors. Concretely, when dealing with aero-engine components, only simple finishing processes are automated nowadays. Most of the high-added value components manufactured are finished hand working, using deburring and polishing manual techniques. The driver of the proposed work is to achieve the necessary knowledge to introduce in a production line a complete finishing process for automated robotic deburring applications with low machinability materials (Inconel 718 in this case-study) on aero-engine casings with complex geometries: extruded casting bosses, internal features, etc. For this purpose, a three-step methodology is presented and analysed, providing a feasible workflow combining visual inspection for part positioning and edge location, with multi-edge solid tools and flexible abrasive tools to automate finishing operations, taking into account all process singularities. Results show that, using correct techniques, processes and parameters, an automated finishing process reducing operating time can be implemented in production lines.

scholarly journals Edge Finishing of Large Turbine Casings Using Defined Multiedge And Abrasive Tools In Automated Cells

2021 ◽  
Author(s):  
Adrian Rodríguez ◽  
Mikel González ◽  
Octavio Pereira ◽  
Luis Norberto López de Lacalle ◽  
Mikel Esparta
Keyword(s):  
Operating Time ◽  
Added Value ◽  
Global Challenge ◽  
Industrial Sectors ◽  
Finishing Process ◽  
Aero Engine ◽  
Abrasive Tools ◽  
Edge Finishing ◽  
Finishing Processes ◽  
Engine Components

Abstract Automate finishing processes is a global challenge in several industrial sectors. Concretely, when dealing with aero-engine components, only simple finishing processes were automated nowadays. Most of the high-added value components manufactured are finished hand working, using deburring and polishing manual techniques. The driver of the proposed work is to achieve the necessary knowledge to introduce in a production line a complete and finishing process for automated robotic deburring applications with low machinability materials (Inconel 718 in the case of study) on aero-engine casings with complex geometries: extruded casting bosses, internal features, etc. For this purpose, a three-step methodology is presented and analysed, providing a feasible workflow combining multi-edge solid tools and flexible abrasive tools to automate finishing operations taking account all the process drawbacks and peculiarities. Results show that using the correct techniques, processes and parameters, an automated finishing process that reduces operating time can be implemented in production lines.

Surface finishing requirements on various internal cylindrical components: A review

2021 ◽  
pp. 251659842110355
Author(s):  
Talwinder Singh Bedi ◽  
Ajay Singh Rana
Keyword(s):  
Surface Quality ◽  
Material Removal ◽  
High Surface ◽  
Internal Surface ◽  
Modern Technology ◽  
Surface Finishing ◽  
Sustainable Product ◽  
Finishing Processes ◽  
Polishing Fluid

Modern technology requires producing of a sustainable product with a high surface accuracy. In applications where the surface quality is highly considerable in various internal cylindrical components requires technology to manufacture an ultrafine surface finish. There is, in general, a probability of inducing errors into products by the traditional finishing processes (such as grinding/honing), which lead to failure. Preferably with some evidence in the main text. Further, the advanced finishing processes are developed, where the finishing forces can be controlled by varying the power output. Instead of a solid abrasive tool, the smart polishing fluid is used, which gets activated under the magnetic fields. In this manuscript, the material removal under different internal surface finishing processes is elaborated, which helps in improving the surface quality of various industrial components. Also, the surface quality produced on various industrial components after traditional as well as advanced finishing processes are discussed.

Five-Axis Constrained and Optimal Orientation Planning

1993 ◽  
Author(s):  
Khorssand Haghpassand
Keyword(s):  
Optimization Problem ◽  
Machining Process ◽  
Surface Finishing ◽  
Tool Geometry ◽  
Drilling Process ◽  
Workpiece Surface ◽  
Optimal Orientation ◽  
Manufacturing Applications ◽  
Finishing Processes ◽  
Five Axis

Abstract The five-axis constrained and optimal orientation planning is formulated as a design optimization problem that incorporates the process machine’s kinematic constraints with the workpiece and tool geometry, to obtain a constrained setup orientation which exploits the maximum capabilities of existing machines. This work will introduce this problem, and will obtain the setup orientation for two different types of rotation structures, i.e., tool rotation and table rotation in O(N) time. Further, the obtained constrained setup orientation, will be augmented to incorporate the workpiece surface magnitude, along with different machine rotation structures, to obtain an optimal setup orientation for different machine rotation structures. The drilling process is also introduced and formulated as additional constraints to the optimization problem. The primary application of the introduced algorithms, is the machining process, where, they can efficiently reduce the number of tool motions and surface finishing processes. However, the solution is very suitable for many manufacturing applications, such as inspection, assembly, robotics, painting, welding, aerospace, electronic surface mount technology, and etc.

A Markovian Finishing Process

2008 ◽  
Vol 130 (2) ◽  
Author(s):  
M. A. S. Mohamed
Keyword(s):  
Triangular Form ◽  
Workpiece Surface ◽  
Finishing Process ◽  
Tool Surface ◽  
Markov Matrix ◽  
Abrasive Surface ◽  
Matrix Mapping ◽  
Abrasive Tools ◽  
Finishing Processes ◽  
Abrasive Paper

Addressed is the mechanism of finishing processes for a workpiece surface using hard abrasive tools such as grinding, abrasive paper, and filing. The mechanism is intended to monitor the gradual changes of the workpiece surface state roughness as the tool is applied for several strokes. Based on a number of common features, the present study simulates each rubbing stroke as a Markov process, and each set of several strokes as a Markov chain. In the simulating model, the discrete probabilistic properties of a specific tool abrasive surface can be expressed in terms of a corresponding Markov matrix operator. Thus, the tool action after one rubbing stroke is obtained via a matrix mapping from a given state roughness to a subsequent state roughness of the workpiece surface. Although the suggested model is capable to handle a comprehensive finishing mechanism, the study focuses on the simple case of zero feeding using a hard abrasive tool, in which the Markov matrix shrinks to a special triangular form. Main findings show that major aspects of the tool surface are transferred to the stepwise roughness state of the workpiece immediately after the first stroke. In addition, regardless of the initial roughness state of the workpiece surface, whether with flat or randomly distributed heights, the ultimate state roughness is unique and definitely features the theoretical case of a plain flat surface. However, this theoretical case is infeasible since it can only be reached after infinite number of strokes.

scholarly journals Enhancement of Photocatalytic Oxidation of Glucose to Value-Added Chemicals on TiO2 Photocatalysts by A Zeolite (Type Y) Support and Metal Loading

Catalysts ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 423 ◽  
Author(s):  
Kamonchanok Roongraung ◽  
Surawut Chuangchote ◽  
Navadol Laosiripojana
Keyword(s):  
Formic Acid ◽  
Surface Area ◽  
Gluconic Acid ◽  
Photocatalytic Oxidation ◽  
High Surface ◽  
Sol Gel ◽  
High Surface Area ◽  
Value Added ◽  
Incipient Wetness Impregnation ◽  
Microwave Assisted

TiO2-based photocatalysts synthesized by the microwave-assisted sol-gel method was tested in the photocatalytic glucose conversion. Modifications of TiO2 with type-Y zeolite (ZeY) and metals (Ag, Cu, and Ag-Cu) were developed for increasing the dispersion of TiO2 nanoparticles and increasing the photocatalytic activity. Effects of the TiO2 dosage to zeolite ratio (i.e., TiO2/ZeY of 10, 20, 40, and 50 mol %) and the silica to alumina ratio in ZeY (i.e., SiO2:Al2O3 of 10, 100, and 500) were firstly studied. It was found that the specific surface area of TiO2/ZeY was 400–590 m2g−1, which was higher than that of pristine TiO2 (34.38 m2g−1). The good properties of 20%TiO2/ZeY photocatalyst, including smaller particles (13.27 nm) and high surface area, could achieve the highest photocatalytic glucose conversion (75%). Yields of gluconic acid, arabinose, xylitol, and formic acid obtained from 20%TiO2/ZeY were 9%, 26%, 4%, and 35%, respectively. For the effect of the silica to alumina ratio, the highest glucose conversion was obtained from SiO2:Al2O3 ratio of 100. Interestingly, it was found that the SiO2:Al2O3 ratio affected the selectivity of carboxylic products (gluconic acid and formic acid). At a low ratio of silica to alumina (SiO2:Al2O3 = 10), higher selectivity of the carboxylic products (gluconic acid = 29% and formic acid = 32%) was obtained (compared with other higher ratios). TiO2/ZeY was further loaded by metals using the microwave-assisted incipient wetness impregnation technique. The highest glucose conversion of 96.9 % was obtained from 1 wt. % Ag-TiO2 (40%)/ZeY. Furthermore, the bimetallic Ag-Cu-loaded TiO2/ZeY presented the highest xylitol yield of 12.93%.

scholarly journals Reallocation effects of recessions and financial crises: an industry-level analysis

2016 ◽  
Vol 16 (2) ◽  
Author(s):  
Fabrizio Coricelli ◽  
Aikaterini E. Karadimitropoulou ◽  
Miguel A. Leon-Ledesma
Keyword(s):  
Emerging Markets ◽  
Emerging Economies ◽  
Financial Crises ◽  
Value Added ◽  
Developed Countries ◽  
Large Set ◽  
Allocation Of Resources ◽  
Developed Economies ◽  
Manufacturing Sectors ◽  
Level Analysis

AbstractWe characterize the behavior of disaggregate manufacturing sectors for a large set of developed and emerging markets around recession dates. We uncover some relevant stylized facts. The dispersion in value added (VA) growth rates in developed economies is counter-cyclical, whereas for emerging countries it is pro-cyclical. Recoveries are more productivity-driven in developed countries as opposed to employment-driven for emerging markets. Around recession episodes sectoral-level misallocation of resources does not significantly change in developed economies, whereas it increases in emerging economies during financial crises. Therefore, there is no evidence that recessions improve the allocation of resources across industries.

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