Development of innovative technologies for stamping shell casings for artillery shells for industrial enterprises of Ukraine
The project is designed to develop the latest, competitive technologies and designs of stamping equipment for the manufacture of artillery shells, which is relevant to increase Ukraine's defense capabilities. Technology development is performed in two directions. The first age includes increased productivity and cost reduction through the use of the latest developments in hot extrusion of hollow semi-finished products and hot and cold stamping by drawing with thinning and crimping at the end of operations. At the same time, increasing productivity and reducing the cost of production is provided by a significant reduction (2-3 times) in the number of extraction transitions with thinning and compression while increasing the stabilit of the deforming tool, as well as reducing metal consumption by 10-15% for each product. This direction applies to the manufacture of steel and brass sleeves.
The second direction includes the use of the latest advances in cold extrusion of hollow brass semi-finished products, which reduce the extrusion force by up to 30%, increase the stability of the deforming tool by 1.5 times and increase the degree of deformation to 20% at this transition. This, together with the use of a special profile deforming tool, will reduce by 2 times the number of cold drawing transitions with thinning and the use of only one final cold pressing operation. Innovative technological processes and designs of stamping equipment for stamping brass and steel billets of small, medium and large caliber sleeves have been developed, which increase production productivity and reduce their cost and allow to use the production of these products at existing domestic enterprises. Mathematical models were created by the finite element method, computer modeling was performed, and constructive, technological and physical-mechanical parameters of the stamping workpiece transition transitions were established. The power modes of stamping, specific forces on the deforming tool, shapes and sizes of semi - finished products at stamping transitions and final shapes and sizes of sleeve blanks are revealed. For small diameter sleeves, it is possible to stamp in four transitions instead of six or eight transitions using existing technology. A new technology for the production of medium-sized low-carbon steel billets using four stamping transitions instead of six using the existing technology, namely: hot back extrusion, two cold extrusion transitions with thinning, calibration and compression, has been developed. An innovative high-performance and resource-saving technology for making large-caliber sleeve blanks from brass has been created, the essence of which is the use of drawing with thinning instead of rotary extrusion, which provided significant savings in metal per workpiece.