Abstract
The use of cutting fluids in mechanical machining operation is important to make cutting easy, produce low surface roughness, increase the rate of productivity, and alleviate the negative effect on work environment and operators. In this project the effect of using different cutting fluids on the surface roughness of aluminum alloy (T6-6061) was studied. The experiment involved the use of constant cutting parameters (cutting speed of 860 rpm, depth of cut at 1.5 mm, and feed rate of 0.12 mm/rev). Three local cutting fluids: mineral used oil, kerosene, and natural used oil (refined sunflower oil) mixed with water at different ratios (5%, 10%, 15%, 20%, and 25%) were used to study their effect on the surface roughness compared to a common lubricate oil used in the cooling process. Results revealed that mineral used oil gave the lowest (best) roughness coefficient at 5% water ratio followed by lubricate oil. Kerosene and natural oil had the highest roughness coefficients. Mineral oil could be recommended for use with local cutting machines reducing the huge amounts of waste oil produced in the country.
Highlights
Lubricants or cutting fluids are oils and or fluids used to facilitate the motion of cutting machines
Three local cutting fluids: mineral used oil, kerosene, and natural used oil mixed with water at different ratios (5%, 10%, 15%, 20%, and 25%) were used to study their effect on the surface roughness compared to a common lubricate oil used in the cooling process
Results revealed that mineral used oil gave the lowest roughness coefficient at 5% water ratio followed by lubricate oil
Summary
Lubricants or cutting fluids are oils and or fluids used to facilitate the motion of cutting machines. The purpose of using lubricating materials is to minimize friction and wear between interacting surfaces and to improve resulting surface finish, and increase tool life. In addition oils are used to decrease heat, prevent corrosion, transfer power, and to remove wear particles. Cutting fluids are of three main types: mineral, semi-synthetic, and synthetic. Lubricants are mixed with specific ratio of water to enhance lubricating oil to increase the coverage of surface and to decrease effect of temperature. Water is a good conductor of heat but its boiling temperature is low and cause rusting of moving parts and it is not a good lubricant [1]
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