STUDY OF CUTTING TOOL DURABILITY DURING SEMI-ROUGH TURNING OF A WORK PIECE MADE OF TN1 ALLOY

The paper presents studies of the durability of cutting tools during semi-rough turning of a workpiece made of a shape-memory alloy by the example of titanium nickelide TN1. The study objective is to increase the durability of tools. To achieve this goal, the following tasks are solved: experimental planning is done; durability tests are carried out; a mathematical dependence of the durability period of the cutting plate on the parameters of the cutting modes are derived; patterns of changes in the durability period are found out and recommendations for the use of processing modes are developed. The calculation error based on the derived dependence is less than 4%, which is high accuracy. It is found out that the parameters of the most effective cutting tool durability mode are cutting speed V = 5 m/min and feed rate S=0.03 mm/rpm at a cutting depth t=0.3 mm. An increase in machining performance will lead to a decrease in the durability period of the cutting plate. The novelty of the work is the mathematical dependence and experimentally established patterns of change in the period of durability of a cutting tool on the parameters of the cutting mode.