Abhari P. Development of scientific foundations and improvement of precision forging processes based on kinematics control of plastic deformation

Object of investigation – Technological process of precision forging. Aim of investigation – Increase efficiency of precision forging technological process based on development of scientific foundations and improvement of deformation technological methods with kinematics control of plastic deformation and material flow to provide increased productivity, product quality and resource savings. Investigation methods - finite element method, energy method of power balance (upper bound method), method of physical modeling and Strain gauge method to measure technological forces and mathematical statistics method. Theoretical and practical results – solve technical problems by mathematical methods and models; make new precision forging process with kinematics control method of plastic deformation, die tool movements and various geometric forms, define rational technological schemes with various shapes, distributions of effective strain, stress and deformation patterns (gridlines distortion) and power mode characteristics and shaping forms, scientific recommendations and design techniques in technological processes to make axisymmetric and non-axisymmetric parts. Novelty – Based on energy method of power balance (upper bound method) and finite element method, develop a complex of mathematical models in precision forging processes with multiple rams, dependencies of power mode, Technology and design various precision processes, predict folding defects such as lap, suction, collapse, cold shut and etc, theoretical and physical modeling to make kinematical mechanism to avoid defects with kinematics control method of plastic deformation. Inculcation – new technological process and die tools in precision forging processes, test and accept new technology and process in industrial manufacture. Industrial application – metal forming and precision forging process.