The Failure Mechanism of Cemented Carbide Milling Insert during Machining Difficult-to-Cut Metal
The measuring temperature test, measuring force and failure test were carried out in order to research failure mechanism of cemented carbide milling insert machining heat resistant steel of 3Cr1Mo1/4V. The falling process of sticking-welding chip was observed by high-speed photograph.The failure morphology was observed and analyzed by SEM. The test result showed that adhesive failure and fatigue failure were the main invalid form. The mathematical model of adhering failure depth was built and the finite element analysis of the thermal-mechanic coupling physical field was conducted based on the milling equipment. The research result illustrated that the temperature of the cutter-chip contact region affectes the depth of adhering failure and they are no-linear positive correlation. The thermal-mechanical coupling equivalent stress inhances with the increase of temperature. The cutter will bring about fatigue failure when it adds over ultimate strength of cemented carbide.
Xianghua Liu, Zhengyi Jiang and Jingtao Han
B. J. Sun et al., "The Failure Mechanism of Cemented Carbide Milling Insert during Machining Difficult-to-Cut Metal", Advanced Materials Research, Vols. 418-420, pp. 1460-1463, 2012