Residual stresses in ultrasonic vibration assistance turning cemented carbide.

The special mechanical properties of cemented carbide with many excellent properties such as high modulus of elasticity, hardness, and strength will cause complex stress distribution due to excessive force and heat in the process of precision manufacturing, which will affect precision retention and endurance limit. Given excessive force and heat distribution and the conflict between brittleness and strength, ultrasonic elliptical vibration turning (UEVT) technique has become an irreplaceable method to machining cemented carbide. However, the addition of elliptical vibration changes the force and heat during cutting, which makes the influence on the residual stress of cemented carbide complicated. Therefore, based on the kinematic characteristics of turning carbide endface, an equivalent three-dimensional simulation model of thermo-mechanical coupling is established. It is found that the simulation models can predict residual stress with high accuracy. Ultrasonic-assisted vibration machining can effectively improve surface residual stresses, thus improving the quality of the machined surface. With the increase of cutting velocity, the duty ratio of cutting increases, and the surface residual stress has a decreasing trend; with the increase of ultrasonic amplitude, the duty ratio of cutting decreases, and the residual stress on the surface tends to increase. [ABSTRACT FROM AUTHOR]