Zlygoriev V. Improvement of forging processes of large forgings based on upsetting of profiled workpieces

Object is technological processes and tools for forging of large forgings. The purpose - quality increasing of the large forgings with responsible destination by means of axial defects closing and decreasing of metal structure in the volume workpiece by means of application a new method of upsetting workpieces. Research methods are: a finite element method (FEM), mathematical statistics, strain measurement, physical and geometric similarity. Theoretical and practical results have been determined: A geometry tool influences to the stress-strain state during profiling of the workpiece; A new method of the workpieces upsetting has been proposed; A method of designing forging processes, a new manufacturing processes, a mechanical deformation modes and a deforming geometry tool for forging have been designed. The novelty of research results: Relationships of the size axial defect changing; Relations of displacement of the axial zone points and parameters of the stress-strain state during profiling and upsetting of the concave cross-section workpieces with different geometry; A force of upsetting operation of the workpieces with concave cross-section. The degree of implementation - a new process technology and deformation tool for profiling and upsetting of the workpieces has been implemented. Scope of use is enterprise of heavy and power engineering.