Abstract
Original scientific paper The paper presents the results of investigation of the influence of conditions of forming emulsion and oil mist on the chip shape and surface roughness of X10CrNi18-8 stainless steel during turning. In the tests, the following machining operations have been compared: dry machining, cooling by the MQCL (Minimal Quantity Cooling Lubricat) method, cooling by the MQL (Minimum Quantity Lubricat) method. The tests have been performed in two stages. In the first stage, the influence of the mass flow of the active medium on the chip shape and on the Ra and Rq roughness parameters of the machined surface have been determined. The purpose of stage two was to determine the influence of the MQL and MQCL method on the selected indices of the machining process as compared to dry machining as a function of variable cutting speed. It has been found that, under MQCL and MQL conditions, the area of formation of elemental chips and ones with the shape of short spirals is wider as compared to dry turning. With increased mass flow of emulsion and oil, tangled chip is formed. Cooling by the MQCL and MQL method results in reduction of the selected roughness parameter values by 2 % to 42 % as compared to dry machining.
Highlights
The process of cutting metals takes place in the surrounding of air or cooling and lubricating liquids (CLL) purposely supplied to the cutting area
The MQCL and MQL methods replace machining with the use of CLL due to its many drawbacks, because CLL is an undesired factor in the process of machining for economical, ecological, health and technological reasons [1]
Small quantity of CLL used in the MQCL and MQL method [1] solves the problem of CLL disposal and reduces the costs involved in the application of it [7]
Summary
The process of cutting metals takes place in the surrounding of air or cooling and lubricating liquids (CLL) purposely supplied to the cutting area. There are many ways of delivering those substances to the cutting zone depending on the method of machining and on the material which is subjected to machining. In precision machining, for the sake of better geometrical state of the surface, process engineers still recommend the use of at least minimum quantity of CLL (Minimum Quantity Cooling Lubricant – MQCL or Minimum Quantity Lubricant – MQL) supplied to the cutting zone by means of compressed air. The MQCL and MQL methods replace machining with the use of CLL due to its many drawbacks, because CLL is an undesired factor in the process of machining for economical, ecological, health and technological reasons [1]. The way of supplying and the quantity of CLL delivered to the cutting zone largely influence machinability of constructional materials. Small quantity of CLL used in the MQCL and MQL method (as little as 50 ml/h) [1] solves the problem of CLL disposal and reduces the costs involved in the application of it [7]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
