چكيده به لاتين
Abstract:
The high volume of cutting fluids used in the machining industry are unstable crude oil derivatives that the overall costs for maintenance of these materials for purification and expulsion and as well as occupational diseases caused by such widespread use are of the major drawbacks associated with the use of these substances. Today, the performance of a production process is evaluated not only from an economic standpoint, but other aspects such as the environment or energy is also considered. Healthy and safe working environment for people working in the machining industry has caused that manufacturers be encouraged to change machining strategy and green production as the best existing strategy for solving this problem is used. On the other hand, due to environmental concerns and growing of limiting regulations for pollution production, the demand for renewable and biodegradable cutting fluids and as well as, substitution new methods for applying cutting fluid to the machining area are on the rise.
This study is dedicated to empirical examination of the impact of two method combination of applying cutting fluid with a minimum quantity lubrication using nano-based fluid and cryogenic cooling method in improving surface integrity and reducing tool wear on turning the A286 superalloy. The results of this method were compared with the results of dry turning, wet with mineral-based fluid (flood), the minimum quantity lubrication with mineral-based fluid and vegetable-based fluid and also nitrogen cooling method. Surface roughness survey results showed that using of vegetable-based nanofluids under the terms of the minimum quantity lubrication and as well as liquid nitrogen under cryogenic cooling caption are caused 22-64% reduction in surface roughness than the wet method and a reduction of 35-77% of it than the dry method. Also, unlike the dry and wet methods, sensitivity of surface roughness rather than cutting parameters has been very low; so that the diagram slope of changes in surface roughness rather than the cutting parameter (feed rate or cutting speed) is very low. This shows minimum quantity cooling-lubrication method rather than cutting parameters is not sensitivity. The existence of nanoparticles in vegetable-based cutting fluid led to the creation of excellent lubrication and friction of tool surface with chip (metal-metal contact) is reduced and followed by vibration between the tool and the workpiece surface to be low (even at high cutting speed and feed rate) and resulting in, is caused lack of abrasion wear and notch wear in the minimum quantity cooling-lubrication method. As well as, The built-up edge formation that is the product of adhesion wear and in machining (dry and wet) of this type of alloys is heavily produced, at the minimum quantity cooling-lubrication has not been observed due to using of liquid nitrogen and nanoparticles.
Keywords: A286 Superalloy, Machining, Minimum quantity lubrication, Surface quality Tool wear
