Investigation of the power characteristics of equipment with a hydroelastic drive.

Abstract

Karnaukh S. G. Investigation of the power characteristics of equipment with a hydroelastic drive. Material working by pressure. 2020. № 1 (50). Р. 272-281.

The purpose of this work is to develop simple and reliable methods for assessing the energy characteristics of the hydraulic drive of high-speed machines. The experience in the development and testing of high-speed machines based on a hydroelastic drive, which is available at the Department of Machine Design Fundamentals of the DSEA, allows to substantiate simpler and more reliable methods for assessing the energy characteristics of a hydraulic drive. A method for measuring the maximum speed of moving parts of a high-speed machine with a hydroelastic drive has been developed and investigated. The discrepancy between the valuesof the theoretical and measured maximum speeds is 18 % on average. The loss of speed of the moving parts of the press hammer is associated to a greater extent with losses due to friction of the rod in the seals, throttling of the working fluid, as well as energy losses due to the opening of the pulse valve of the hydroelastic cylinder at the moment the leading front of the shock wave is formed. A method for measuring the impact energy of a high-speed machine with a hydroelastic drive has been developed and investigated. The adequacy of the mathematical model is confirmed by experimental research. The error of the calculated and measured values of the impact energy of the press hammer (design of the DSEA) does not exceed 2,3 %. The proposed methods for measuring the energy characteristics of the hydraulic drive of high-speed machines can be recommended for implementation in production in the study of the capabilities of high-speed machines and the development of related technological processes. In contrast to the known methods, the proposed methods are easy to implement, do not require complex measuring equipment, the experimental error is not affected by the real conditions of the press-forging production, the experiment time and the amount of transfers are reduced.