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RISS 인기검색어
- 검색키워드
- 저자 : Salman Pervaiz (검색결과 4 건)
- 무료
- 기관 내 무료
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Power Consumption and Tool Wear Assessment when Machining Titanium Alloys
Salman Pervaiz,Ibrahim Deiab,Basil Darras 한국정밀공학회 2013 International Journal of Precision Engineering and Vol.14 No.6
Titanium alloys are of interest for aerospace industries due to their high strength to weight ratio, outstanding corrosion and erosion properties and ability to operate at higher temperature. They are classified as difficult to cut materials because of their low thermal conductivity, high chemical reactivity and high strength at elevated temperature. The machinability rating of titanium alloys is low compared to other materials from many aspects. This study focuses on studying the cutting tool wear and power consumption when machining Titanium alloys under different cutting conditions. Design of experiments was used to develop a test matrix that cover the range of cutting conditions recommended for machining titanium alloys. Cutting forces, power consumption, tool wear and surface roughness were measured and analyzed. Tool wear mechanisms were also studied using scanning electron microscopy.
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Salman Pervaiz,Saqib Anwar,Imran Qureshi,Naveed Ahmed 한국정밀공학회 2019 International Journal of Precision Engineering and Vol.6 No.1
Titanium alloys are generally known as difficult-to-machine materials because of their low machinability ratings. Their usage is favored for demanding sectors because of their high strength to weight ratio, high corrosion resistance and ability to operate at elevated temperatures. Machining of titanium alloys results in higher environmental burden, because they require high energy and generous amount of cutting fluids during machining. It is a well-known fact that most of the cutting fluids are toxic and non-biodegradable in nature and their disposal is costly. Therefore, researchers in metal cutting are keen to explore the potential of minimum quantity lubrication (MQL) and minimum quantity cooling lubrication (MQCL) based cooling techniques as an alternate to conventional flood cooling. When MQL and MQCL techniques are used by employing biodegradable vegetable based oils then there is an encouraging potential of replacing the non-biodegradable cutting fluids. This study documents the recent experimental and numerical advances achieved in the MQL and MQCL assisted techniques for machining titanium alloys. The study also highlights the current challenges in this area and recommends future work to address these challenges.
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Muhammad Kashif Zia,Salman Pervaiz,Saqib Anwar,Wael A. Samad 한국정밀공학회 2019 International Journal of Precision Engineering and Vol.6 No.5
Nontraditional machining processes are frequently used in product manufacturing when either the material is difficult to machine, or a very precise geometry is required. Electrical discharge machining (EDM) is considered as a popular nontraditional machining process. EDM process is used to machine a diverse range of engineering materials such as hard materials, ceramics and modern composite materials. It is primarily used in the finishing of components related to aerospace, automotive, surgical, electronic and biomedical industrial sectors. However, high energy consumption, hazardous dielectric waste generation, toxic emissions and fire hazards are the major concerns with respect to sustainability. The present study reviews the state-of-the-art research performed to explore the sustainability aspects of EDM process under the framework of three pillars or triple bottom line sustainability approach. The study reveals economic, environmental and social concerns for the EDM process. Major economic concerns were found to be energy consumption, electrode preparation and treatment of dielectric fluid. Major environmental concerns were based on the hazardous emissions and disposal of dielectric fluid. However, major social concerns were linked with the inhalation of fumes, skin diseases and fire or explosion related threat. The study also recommends different solutions for all economic, environmental and social concerns.
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Tool Wear Patterns When Turning of Titanium Alloy Using Sustainable Lubrication Strategies
Syed Waqar Raza,Ibrahim Deiab,Salman Pervaiz 한국정밀공학회 2014 International Journal of Precision Engineering and Vol. No.
A key area of research in sustainable machining is the search for environmentally benign cooling strategies. Vegetable oils have oftenbeen proposed as sustainable alternative to the conventional synthetic emulsion coolants. Techniques like dry and cryogenicmachining, MQL and MQCL have also been proposed. The current study investigates the effect of six different strategies on the flanktool wear during turning of titanium Ti-6Al-4v using uncoated carbide tool at two levels of speed and feed. The mechanisms of toolwear are discussed. The use of rapeseed vegetable oil in MQL and MQCL configuration turns out to be an overall sustainablealternative at low feed and speed. Thus confirming the promise predicted in the use of vegetable oil as a lubricant for machining. At high speed and feed, cryogenic machining is more suitable for sustainable machining of Titanium.
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