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.
Austenitic stainless 316 is one of the most widely used steels in many industries with excellent mechanical and thermal properties. 316L steel is used in high temperature corrosive environments. Steel parts are manufactured in different ways that machining is one of the most widely used methods of production. Depending on the machining and lubrication conditions, the quality of the work piece can be controlled and changed. Limited research has been done on the effect of different cooling methods on the machining ability of austenitic stainless steel 316L. Therefore, in the present study, four different methods of lubrication including dry, wet, minimum quantity lubrication (MQL) and minimum quantity cooling-lubrication (MQCL) with different cutting lengths have been studied. There was defect in the dry state such as scratches and crushing, which was almost eliminated in MQL mode due to proper lubrication. Also by using MQCL method removal of heat factor and proper lubrication was performed simultaneously which resulted in excellent surface quality with appropriate tribiological properties. Also, the formation of continuous chip in dry state was changed to microchip using MQL and MQCL methods, which improved heat transfer and eliminated heat factor from the work piece and prevented the formation of built-up edges in the tool. Therefore, it can be concluded that among the tested lubrication methods, the MQCL method produces desirable surface quality with low and compact size, which is economically and environmentally important.
Keywords: Surface quality, Chip formation, Steel 316L, Minimum quantity lubrication, Machining.
