scholarly journals Experimental Investigation of MQL Optimum Parameters in End Milling of AA6061-T6 using Taguchi Method

2018 ◽  
Vol 7 (4.35) ◽  
pp. 186 ◽  
Author(s):  
W. Safiei ◽  
M.M. Rahman ◽  
S.A. Rusdan
Keyword(s):  
Surface Roughness ◽  
Flow Rate ◽  
Prediction Interval ◽  
End Milling ◽  
Green Manufacturing ◽  
Work Piece ◽  
Base Line ◽  
Machining Performance ◽  
Optimum Parameters ◽  
Mql System

Minimum Quantity Lubricants is a technique in supplying small quantity of lubricant into machining area which also part of green manufacturing approach that receive wide attention globally. The main driven of introducing MQL method was due to negative environmental impact which leads to safety and health issues of conventional coolant among workers especially in tool and mould industries. Besides, based on research findings, the MQL system has the capability for lubricating and cooling both work piece and cutting tool. In order to find the best solution for machining and also to enhance machining performance, first and foremost the MQL parameters must be controlled wisely as it has remarkable effects on lubricant coverage, droplets size and subsequently influence the machining performance. Nozzle angle, nozzle distance and MQL flow rate are the important parameters studied and surface roughness is the response parameter. Therefore, in this study, MQL optimum parameters were explored by minimizing surface roughness in end milling process using Taguchi L9 orthogonal method. Aluminum Alloy 6061-T6 was selected as work piece material. The results show that the best combination of MQL parameters in minimizing surface roughness was obtained at 30mm nozzle distance, 30 degree nozzle angle and 1.98 mL/min MQL flow rate. Hence, based on this optimal condition, three confirmation runs were conducted. The margin error is acceptable which less than 10% and within prediction interval. This results can work as a base line guidance for any experimental that employ MQL system.

Experimental Researching of Thermal - Assisted Milling with Induction on Surface Roughness of SKD11 Steel

2019 ◽  
Vol 889 ◽  
pp. 190-196
Author(s):  
Mac Thi Bich ◽  
Pham Thi Hoa ◽  
Banh Tien Long ◽  
Nguyen Duc Toan
Keyword(s):  
Surface Roughness ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
End Milling ◽  
Heating Process ◽  
Work Piece ◽  
Technical Parameters ◽  
Roughness Model ◽  
Good Agreement

This paper presents experimental studied results about surface roughness during end milling SKD11 steel under room temperature and work-piece preheated condition. Conventional samples were first performed. The samples which are same technical parameters were then performed at elevated temperatures to evaluate effective of heating process on the surface roughness. Orthogonal array Taguchi method was used to experimental design. The results showed that the surface quality of product was significantly improved under thermal - assisted milling. The surface roughness model during machining at room and elevated temperatures were evaluated and showed a good agreement with result of experiments.

A Study of the Impact of Workpiece Location on Machining Performance of a 2-DoF PKM Based Machine Tool

2013 ◽  
Author(s):  
A. B. Koteswara Rao ◽  
Sanjay Darvekar ◽  
K. Ramji
Keyword(s):  
Surface Roughness ◽  
End Milling ◽  
Structural Deformation ◽  
Quality Level ◽  
Machining Performance ◽  
Machined Surface ◽  
Milling Operations ◽  
Milling Operation ◽  
Tool Position ◽  
The Impact

This paper presents the impact of workpiece location on the machining performance of a 2-degree of freedom Parallel Kinematic Machine (PKM) tool. The PKM behavior is highly non-uniform and depends on the tool position within the workspace. The structural deformation and vibration due to cutting loads affect the quality of machined surfaces. The aim of the present study is to find the optimal tool position (workpiece location) where the workpiece is machined to a specific quality level. End-milling operations are carried out at various locations within the workspace and the surface roughness of machined surface (Ra) is measured at each location. A regression model is developed to predict the surface roughness. The study shows that the workpiece location has significant impact upon surface roughness of the machined part. Finally, a suitable workspace is defined for end-milling operation.

Application of tri-hybridized carbonaceous nanocutting fluids in an end milling operation by the minimum quantity lubrication technique

2021 ◽  
pp. 135065012110438
Author(s):  
S. Vignesh ◽  
U. Mohammed Iqbal
Keyword(s):  
Surface Roughness ◽  
Tool Wear ◽  
End Milling ◽  
Hexagonal Boron Nitride ◽  
Coconut Oil ◽  
Minimum Quantity Lubrication ◽  
Work Piece ◽  
Cutting Fluids ◽  
Minimum Quantity ◽  
Milling Operations

This paper is concentrated on the exploration of carbonaceous nanocutting fluids with the concept of tri-hybridization with improved lubricative and cooling properties by using multi-walled carbon nanotubes, hexagonal boron nitride , and graphene nanoparticles with neat cold-pressed coconut oil in a fixed volumetric proportion. The rheological properties of the nanofluids were studied to assess their performance in real-time end milling operations using an AA7075 work piece on a CNC lathe machine under a minimum quantity lubrication environment. At the outset, the carbonaceous nanofluids gave good performance when compared to conventional cutting fluids. Furthermore, the surfaces of the tribo-pairs and the chips formed were analyzed using a profilometer and high-end microscopes. The results obtained from the experiments confirm that the tri-hybridized carbonaceous nanolubricant has reduced the cutting force, tool wear, and surface roughness when correlated to monotype nanofluids. The scanning electron microscope images of the surface and tool were studied and it was found that the surface quality was maintained while end milling with tri-hybridized carbonaceous nanofluid. Improvement of ∼17%, 20% and 25% in cutting forces, surface roughness and tool wear was found in tri-hybrid fluid when compared to other fluids. Thus, the present work indicates that the addition of carbon-based nanoparticles with coconut oil has offered better performance and is found to be a credible alternative to existing conventional cutting fluids.

Machinability of Aluminum Nitride Ceramic Using TiAlN and TiN Coated Carbide Tool Insert

2013 ◽  
Vol 773-774 ◽  
pp. 437-447
Author(s):  
Moola Mohan Reddy ◽  
Alexander Gorin ◽  
Abou Ei Hossein A. Khaled ◽  
D. Sujan
Keyword(s):  
Surface Roughness ◽  
Tool Wear ◽  
End Milling ◽  
Cutting Speed ◽  
Milling Process ◽  
Work Piece ◽  
Carbide Tool ◽  
Coated Carbide ◽  
Cnc End Milling ◽  
End Milling Process

This research presents the performance of Aluminum nitride ceramic in end milling using using TiAlN and TiN coated carbide tool insert under dry machining. The surface roughness of the work piece and tool wear was analyzed in this. The design of experiments (DOE) approach using Response surface methodology was implemented to optimize the cutting parameters of a computer numerical control (CNC) end milling machine. The analysis of variance (ANOVA) was adapted to identify the most influential factors on the CNC end milling process. The mathematical predictive model developed for surface roughness and tool wear in terms of cutting speed, feed rate, and depth of cut. The cutting speed is found to be the most significant factor affecting the surface roughness of work piece and tool wear in end milling process.

Monitoring and Prediction of Surface Roughness in Ball End Milling with Air Blow Application

2012 ◽  
Vol 538-541 ◽  
pp. 1332-1337 ◽  
Author(s):  
Somkiat Tangjitsitcharoen ◽  
Suthas Ratanakuakangwan
Keyword(s):  
Surface Roughness ◽  
Regression Analysis ◽  
Cutting Force ◽  
Multiple Regression Analysis ◽  
Prediction Accuracy ◽  
Prediction Interval ◽  
End Milling ◽  
Cutting Condition ◽  
Ball End Milling ◽  
Roughness Model

This paper presents the additional work of the previous research in order to investigate the relations of the cutting conditions and the various air blow applications which affect the surface roughness. The suitable cutting condition is determined for the aluminum (Al6063) with the ball end milling by utilizing the response surface analysis referring to the minimum surface roughness. The cutting force is monitored during the cutting to analyze the surface roughness. The dynamometer is employed and installed on the table of 5-axis CNC maching center to measure the in-process cutting force. The models of surface roughness and cutting force are calculated by using the multiple regression analysis with the least squared method at 95% significant level. The experimentally obtained results showed that the surface roughness can be well explained by the in-process cutting force. The prediction accuracy and the prediction interval have been presented to verify the obtained surface roughness model at 95% confident level.

Prediction Model of Surface Roughness for 2A70 Alloy Based on Orthogonal Test

2010 ◽  
Vol 458 ◽  
pp. 179-184
Author(s):  
Xin Wei Yu ◽  
Xiao Hong Ma
Keyword(s):  
Surface Roughness ◽  
Prediction Model ◽  
High Speed ◽  
End Milling ◽  
Orthogonal Test ◽  
Work Piece ◽  
Range Analysis ◽  
Milling Parameters ◽  
Aluminum Alloy Surface

Influencing rules of surface roughness for the work-piece by changing major milling parameters are studied when 2A70 alloy are cut by cemented carbide ball-end milling cutter cuts in high-speed. Primary and secondary influence order of test factors are found out through range analysis and variance analysis of test data according to the orthogonal test designed by the manufacture experience. Influencing tendency between milling parameters such as feed per tooth, back cutting depth, milling speed and line width and the roughness are obtained, a prediction model of aluminum alloy surface roughness is built up, surface quality of the product can be predicted and productivity can be analyzed.

scholarly journals Centrifugal Compressor Stall Control by the Application of Engineered Surface Roughness on Diffuser Shroud Using Numerical Simulations

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2033
Author(s):  
Amjid Khan ◽  
Muhammad Irfan ◽  
Usama Muhammad Niazi ◽  
Imran Shah ◽  
Stanislaw Legutko ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Centrifugal Compressor ◽  
Control Method ◽  
Flow Instability ◽  
Passive Flow Control ◽  
Passive Flow ◽  
Low Mass

Downsizing in engine size is pushing the automotive industry to operate compressors at low mass flow rate. However, the operation of turbocharger centrifugal compressor at low mass flow rate leads to fluid flow instabilities such as stall. To reduce flow instability, surface roughness is employed as a passive flow control method. This paper evaluates the effect of surface roughness on a turbocharger centrifugal compressor performance. A realistic validation of SRV2-O compressor stage designed and developed by German Aerospace Center (DLR) is achieved from comparison with the experimental data. In the first part, numerical simulations have been performed from stall to choke to study the overall performance variation at design conditions: 2.55 kg/s mass flow rate and rotational speed of 50,000 rpm. In second part, surface roughness of magnitude range 0–200 μm has been applied on the diffuser shroud to control flow instability. It was found that completely rough regime showed effective quantitative results in controlling stall phenomena, which results in increases of operating range from 16% to 18% and stall margin from 5.62% to 7.98%. Surface roughness as a passive flow control method to reduce flow instability in the diffuser section is the novelty of this research. Keeping in view the effects of surface roughness, it will help the turbocharger manufacturers to reduce the flow instabilities in the compressor with ease and improve the overall performance.

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