surface roughness.

The present paper examines the impact of preheating a titanium alloy on cutting force and surface quality during turning. The primary objective of the present study is to ascertain how variations in workpiece temperature prior to machining affect the technological parameters of the cutting process, specifically cutting force and the surface roughness parameter Ra. The experimental portion of the study involved the turning of a Ti-6Al-4V titanium alloy workpiece at numerous preheating temperatures, including room temperature, 300°C, 400°C, 500°C, and 600°C.

The article analyzes modern technologies for machining workpieces of hard-to-machine materials with a hardness parameter higher than 45 HRC (Rockwell hardness). It is shown that the mechanics and thermodynamics of the forming process in such materials are subject to specific laws of cutting theory, which have systemic differences from the processing of traditional engineering materials. The advantages and disadvantages of machining chromium-nickel alloys using CNB inserts instead of grinding are analyzed.