Molodetska T. Improvement of the process of cold bending wide workpieces made from low-plasticity metals based on the development of methods of technological mechanics

Research object - processes of cold plastic deformation of low-plasticity metals; goal of the work is improvement of the cold bending process for broad workpieces from low-plasticity metals as to the rational choice of the geometric parameters of products, prevention of their damage during forming and determination of the process energy power parameters; research methods: theoretical study and analysis of the forming process mechanics for profiled parts; experimental research in the laboratory conditions with the application of modern facilities, specially - designed devices and standard equipment experimental calculations (determination of the stress-strained state using computer modeling and, particularly, the finite element method); theoretical results: regression model of the lateral bending process is developed for broad thick-sheet workpieces, which makes it possible to establish the dependence of maximal deformation on the workpiece geometric parameters; construction of plasticity diagrams for bending processes has been improved with the application of the parameter taking into account the material properties; energy-power parameters of the bending process are determined using the method of equivalent evaluation and construction of respective regression models; principles are proposed for binding technological parameters of the process of bending broad workpieces in stamps, which ensure absence of spoilage and reduction of deforming forces. Practical results include development of recommendations that make it possible to predict damage of thick-sheet workpieces in the conditions of flat lateral bending at the technological process design stage, which enables selection of the workpiece geometric parameters taking into account properties of the material; elaboration of recommendations on ensuring reliable stamping of z-shaped products from low-plasticity metals; obtaining dependencies that make it possible to determince forces required for stamping z-shaped products on the basis of the material flow curve and the workpiece geometric dimensions; development of technological solutions that allow to reduce deforming force during forming operations. Implementation stage - main results of the theses are implemented at the following enterprises: "Vinnytsia experimental plant"and company "Elite". Application field - enterprises specializing in design and production of profiled parts.