OPERATIONAL EXPERIENCE OF ELECTROHYDRAULIC PRESSES FOR STAMPING LARGE-DIMENSIONAL SHEET PARTS

Abstract

Main distinctive features of electrohydraulic presses (EH-presses) for large-dimensional articles manufacturing are considered. It is shown that EH-presses demonstrate the maximum efficiency at large-dimensional articles forming. Direct scaling of conventional design presses with low level of saved energy for increasing their technological possibilities and saved energy isn’t effective due to some reasons.

To ground theoretical knowledge about possibilities of temporary-spatial control, energy flows managing and saved energy increasing of EH-installations series of analytical, numerical simulations and natural experiments was done. These experiments were devoted to studying processes of transferring energy from the zone of discharge to the object of processing.

Generally, results of such research were adequate and complemented to each other. These results approved possibility of significant increasing (up to ten times) of energy that releases in a single discharge without crucial reduction of technological equipment resistance and increasing duration of technological cycle of large amount of released energy.

Scientific research devoted to energy transformation from its electrical form to mechanical work of plastic deformation allowed us to develop and realize practically multi-contour EH-press with saved energy up to 500 kJ. Experimental-industrial research for realization technology of consequent local loading was proved by some types of large-dimensional sheet articles. The quality of obtained articles was elevated; resources consumption was reduced. Results of improving process of articles forming and perfection of forming process parameters are shown.

Results of experimental-industrial experience of technological processes of articles forming are analyzed. For such processes managing of loading field topology is quite necessary. The most crucial steps for perfectioning arrangement of energy releasing devices are developed.

This study was caused by the necessity of operational electrodes lifetime increasing because they are subjected to very intensive wear during operation.

Comparison of large-dimensional articles manufacturing efficiency with alternative manufacturing methods is given.

Goal of the paper is to expand knowledge of specialists with EH-presses having possibility both to form articles with elevated precision and quality and widen level of technological processes.

Main tasks: estimationof workability of multi-contour EH-press equipped with multi-electrode discharge blocks; estimationof possibilities of temporary-spatial control of loading in application to adding auxiliary nomenclature groups of sheet articles which can be produced by forming; determination possibilities of perfectioning of all elements of technological equipment to increase labor efficiency; comparison of technical-economic indexes for different technologies of forming for large-dimensional sheet articles;