Improving the workability of high-strength cast iron by using technological media

Abstract

The process of supplying the high-strength cast irons (HSCI) due to the high level of exploitation characteristics is being streamed by the lack of sufficient level of damage to the use of wood instruments. The high-quality cast iron with the cool graphite lead to a significant performance and solidity and a heterogeneous structure, so that it can produce significant strength in development, increased thermal imaging in the process of mechanics. An effective method for reducing the machinability is a cutting fluid (CF). Goal is to study the effectiveness of polymer-containing cutting fluid. Method. The amount of wear on the rear surface was measured by an instrumental microscope MII-2. The coefficient of sliding friction of the tool-processed material pair was determined by the method of physical modeling on a special installation. Results. When machining the holes with drills made of steel R6M5 and R6M5K5, a decrease by 1.7 and 8.8 times respectively in the intensity of tool wear is observed in comparison with drilling in an industrial emulsion medium under similar conditions. The high efficiency of polymer-containing cutting fluids during drilling is explained by a significant decrease in the friction coefficient, which helps to reduce the cutting force, temperature and the intensity of tool wear. Polymer-containing cutting fluid has a higher lubricating effect than emulsion. The presence of polymers facilitates the processes of deformation and destruction of cast iron, which is associated with the manifestation of the rebinding effect. Scientific novelty. The high level of mechanical stresses and the increased temperature at processing of HSCI by drilling create favorable conditions for mechanical destruction and thermal destruction of polymers that together with high lubricating action provides high efficiency of polymer-containing cutting fluid. Practical significance. Рolymer-containing cutting fluid does not contain oil and is an environmentally friendly liquid, it also has a lower cost. The high efficiency of the polymer-containing medium during drilling is confirmed.