CALCULATION OF TECHNOLOGY PARAMETERS OF ALUMINUM POWDER EXTRUSION

An algorithm has been developed for calculating the extrusion force during the process of pressing briquettes of aluminum powder. The algorithm allows you to pre-determine the energy-power parameters of the process, especially at the initial stage: effort, power, speed. The initial parameters for the calculations are material characteristics: briquette density (bulk density), briquette dimensions; degree of deformation (drawing), deformation resistance depending on the strain rate and temperature; as well as geometric and speed parameters of the process: the type of pressing (direct or reverse), the dimensions of the press tool (length, diameter), the dimensions of the matrix (up to the size of the calibrating girdle), the friction coefficient (taking into account the lubricant for pressing), the speed of the press block. It is shown that the presence of unsteady pressing sections and the dependence of the resistance on the strain rate lead to process instability and, consequently, to the uneven properties of the resulting bars. However, the presented algorithm allows us to calculate and reduce this negative effect when using automation systems (stabilizing speed-force systems) with appropriate adjustment.