| 1. |
- Deiab, I., et al.
(författare)
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Analysis of lubrication strategies for sustainable machining during turning of titanium ti-6al-4v alloy
- 2014
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Konferensbidrag (refereegranskat)abstract
- The current drive for achieving the implementation of sustainability concepts in manufacturing calls for sustainable machining practices to be adopted. A key area of research is the search for environmentally benign cooling strategies. Vegetable oils have often been proposed as sustainable alternatives to the conventional synthetic emulsion coolants. Techniques like dry and cryogenic machining, minimum quantity lubrication (MQL) and minimum quantity cooled lubrication (MQCL) have also been proposed. The current study investigates the effect of six different strategies on the flank tool wear, surface roughness and energy consumption during turning of titanium Ti-6Al-4V using uncoated carbide tool at certain speed and feed. The use of rapeseed vegetable oil in MQL and MQCL configuration turns out to be an overall sustainable alternative. Thus confirming the promise predicted in the use of vegetable oil as a lubricant for machining.
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| 2. |
- Pervaiz, Salman, et al.
(författare)
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A finite element based energy consumption analysis for machining AISI 1045 carbon steel using uncoated carbide tool
- 2016
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Ingår i: Advances in Materials and Processing Technologies. - : Taylor and Francis Ltd.. - 2374-068X. ; 2:1, s. 83-92
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Tidskriftsartikel (refereegranskat)abstract
- This study investigates the energy consumption involved in the machining of AISI 1045 steel using uncoated carbide tools. Energy utilised in the machining operation is termed as an important machining performance indicator that has direct influence on the greenhouse gas (GHG) emissions. The present study utilised finite element modelling (FEM) technique to compute energy consumption involved in the particular machining operation. The study also compliments the environmental implications resulting from the energy consumption. Numerical simulations were performed using Deform-2D software package. The simulated cutting forces were predicted and used further to compute power and energy consumption. Geographical location also has critical influence on the production of CO 2 emissions resulting from energy consumption. The present study integrates the energy mix of United Arab Emirates for CO 2 calculations.
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| 3. |
- Pervaiz, S., et al.
(författare)
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An experimental analysis of energy consumption in milling strategies
- 2012
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Ingår i: 2012 International Conference on Computer Systems and Industrial Informatics, ICCSII 2012. - : IEEE. - 9781467351577 ; , s. 6454527-
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Konferensbidrag (refereegranskat)abstract
- Pocket milling operation is one of the widely used milling operations. CAM packages offer different tool path strategies to execute a machining operation. In the presented work zigzag, constant overlap spiral, parallel spiral and oneway tool path strategies were compared in terms of power and energy consumption for pocket milling of Al 6061 aluminum alloy. All pocketing operations were conducted using 8 mm diameter High Speed Steel (HSS) end milling cutters. Energy utilization was analysed for all tool path strategies. This work aims to develop better understanding towards sustainability concept in core machining phase.
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| 4. |
- Pervaiz, Salman, et al.
(författare)
-
An experimental investigation on effect of minimum quantity cooling lubrication (MQCL) in machining titanium alloy (Ti6Al4V)
- 2016
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Ingår i: The International Journal of Advanced Manufacturing Technology. - : Springer London. - 0268-3768 .- 1433-3015. ; 87:5-8, s. 1371-1386
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Tidskriftsartikel (refereegranskat)abstract
- During the machining operation, elevated temperatures are achieved at the cutting interface due to the presence of high plastic deformation and friction in between the tool and chip contacting area. Efficient heat dissipation from the cutting interface is required to achieve better machining performance. Elevated temperature in the cutting area results in lower tool life as it facilitates different types of wear mechanisms. Metal working fluids (MWFs) are employed to reduce heat and friction in the cutting zone, simultaneously to help in the flushing of waste particles. The MWFs are based on either water or petroleum oil and include several additives which make them non-biodegradable and toxic in nature. The minimum quantity lubrication (MQL) method offers a feasible substitute to the MWF-based conventional flood cooling method. In this study, a vegetable oil-based MQL system was mixed with sub-zero temperature air to design a new minimum quantity cooling lubrication (MQCL) system. The study investigates the machinability of Ti6Al4V using an MQCL system under various oil flow rates and compared its machining performance with both dry cutting and conventional flood cooling. For further evaluation, the study investigated surface roughness, flank wear, and associated wear mechanisms. It was found that in the MQCL system (60–70 ml/h), oil supply rates provided reliable machining performance at higher feed levels.
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| 5. |
- Pervaiz, Salman, et al.
(författare)
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Experimental and numerical investigation of Ti6A14V alloy machinability using TiAIN coated tools
- 2014
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Ingår i: Transactions of the North American Manufacturing Research Institution of SME. - : Society of Manufacturing Engineers. ; , s. 104-113
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Konferensbidrag (refereegranskat)abstract
- Titanium alloys exhibit extraordinary characteristics such as excellent strength-to-weight ratio, superior corrosive and erosive resistance and capability to operate at high operating temperatures. These alloys show poor machinability rating due their low thermal conductivity and high chemical reactivity. This study investigates the machinability of Ti6A14V using TiAIN coated tools by analyzing cutting forces and cutting temperatures. The simulated cutting force data was used to predict the total energy utilized by the process. Cutting tool temperatures during the machining operation were measured by an Infrared (IR) camera with cutting forces experiments. Finite element simulations can offer a cost effective solution when evaluating the machining performance of difficult to cut materials such as Titanium alloys. The study incorporated modified Johnson-Cook constitutive equation and friction model to develop the finite element simulations of the machining process. The finite element simulated results of forces and tool temperature presented good agreement with the experimental results. Copyright
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| 6. |
- Pervaiz, S., et al.
(författare)
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Performance evaluation of TiAlN- PVD coated inserts for machining Ti-6Al-4V under different cooling strategies
- 2013
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Ingår i: Advanced Materials Research III. - : Trans Tech Publications Inc.. - 9783037856765 ; , s. 68-75
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Konferensbidrag (refereegranskat)abstract
- Titanium alloys are labeled as difficult to materials because of their low machinability rating. This paper presents an experimental study of machining Ti-6Al-4V under turning operation. All machining tests were conducted under dry, mist and flood cooling approaches by using a TiAlN coated carbide cutting inserts. All cutting experiments were conducted using high and low levels of cutting speeds and feed rates. The study compared surface finish of machined surface and flank wear at cutting edge under dry, mist and flood cooling approaches. Scanning electron microscopy was utilized to investigate the flank wear at cutting edge under various cooling approaches and cutting conditions. Investigation revealed that TiAlN coated carbides performed comparatively better at higher cutting speed.
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