Computational and Experimental Method for Assessing the Thermal Strength of High-Loaded Diesel Engines

The article discusses the reasons of fatigue failure of pistons of high-loaded diesel engines. A deformation-kinetic criterion is proposed, generalized to non-isothermal loading, which allows more correct calculation of the number of thermal loading cycles before the appearance of fatigue damage. For a specific implementation of the proposed criterion, a calculated assessment of the piston stress-strain rate was carried out using the FEM. The boundary conditions for the calculation were obtained by thermometry of the piston head on a non-motorized thermal stand (TS). Comparison of the calculated and experimental values of the number of thermal cycles before the appearance of cracks on the edge of the combustion chamber (CC) of pistons made by casting and isothermal stamping is given.

Induction heating system for die tooling of a press for isothermal stamping of large-sized parts

The application of induction heating of a die tool during hot stamping of large-sized parts is considered. A design of four inductors is proposed. The calculation confirmed the possibility of maintaining the working temperature of the die tool in the subject way. Keywords: die tool, induction heating, finite element method [email protected]