A Study of Effects of the Cutting Tool Geometry on the Output Parameters When Turning VT22 Titanium Alloy

Abstract

AbstractThe purpose of this work is to study effects of the cutter clearance angle on the output parameters when turning VT22 titanium alloy employed in the aerospace industry. Side straight-turning tools with brazed VK8 inserts were used. Cutting forces, vibration acceleration, and surface roughness were investigated as output parameters. The cutting forces were measured by the dynamometric method using a laboratory bench. Vibrations were measured with an accelerometer built into the laboratory bench. The roughness was measured by the contact method. The tool wear was measured with a video measuring machine. The dependences of cutting force projections on clearance angles show that the cutting forces decrease with an increase in the clearance angle. The dependence of vibration acceleration on rear angles is inverse. The minimum clearance angle ensures the cutting stability due to the technological damping. The surface roughness corresponding to the finishing requirements was achieved. The range of clearance angles at which the roughness has the best value was determined. The clearance angle has an impact on the tool wear at different feeds per revolution. The wear was measured on both the front and back of the tool. The optimal clearance angles were determined for different feeds per revolution. Optimal clearance angles and cutting modes were recommended for the real production conditions. Factors that have a negative effect on the reliability were identified. The influence of the build-up on the tool life was identified. Avenues for further research which can improve the reliability of results were indicated. The experiment plan can be expanded in order to expand the technological area of the results.KeywordsTitanium alloysTurningClearance angleCutting forcesVibrationTool wear