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0219U000569,
0118U003047
,
Development and research of the technological processes for the manufacture of responsible destination forgings for heavy and power engineering.
Markov Oleg Evgenjevich, Доктор технічних наук
07-02-2019
Donbass State Engineering Academy
Object of research: technological processes and tool for forging of large workpieces. Methods of research: theoretical study of stress-strain state of metal carried out by finite element method; experimental verification of the reliability degree of determining stress-strain state was carried out based on the method of coordinate grids. The aime is improving the forging processes of large parts with responsible destination based on the upsetting operation of profiled workpieces. It was found that forging by convex dies with an angle equal to 120 °, increases the level of compressive stress in the axial zone of the workpiece. This facilitate the closure of the axial defect at a reduction of 20 %. Moreover, the axial defect during upsetting is closed at angles of the convex dies ? = 120° ... 150 °. A depth of the concavity faces has to d / D = 0.8 ... 0.85. The recommended degree of deformation which will occur a closing of the axial defects is not less than 50 %. Formation of the concave faces of the workpiece enhances a deformation force during upsetting. Increasing of the concave faces depth leads to reducing of an upsetting force. The rational geometry of convex dies and mechanical modes of the profiling on a workpiece with concave cross-section has been established. The angle of the convex die is 120 ° and reduction is 10 ... 20 %. The intensive closing of the axial defect during upsetting of the workpiece with concave cross-section occurs at deformation more than 25 %. Steel-samples investigations have concluded that the profiling by convex dies with the angle of 120 ° ensures a complete closing of the workpiece axial defects. Practical recommendations for the profiling ingots to the workpiece with concave cross-section and subsequent upsetting have been designed. The sequence designing of effective forging processes using of the workpieces upsetting with concave cross-section has been developed. New forging processes of large parts with upsetting operation of the workpieces with concave cross-section have been implemented. Developed new forging processes improved a high quality of large forgings and decline of spoilage from 14 % to 4 %. The mechanical properties of parts increased by an average of 8 ... 11%. Field of application: forging, pressing, stamping, profiling, powder metallurgy.
Авдєєнко Анатолій Петрович
Алієва Лєйла Іграмотдінівна
Герасименко Олексій Васильович
Косілов Максим Сергійович
Марков Олег Євгенійович
Маркова Марина Олександрівна
Різак Павло Іванович
Рагуліна Надія Вікторівна
Шевцов Сергій Олександрович
2020-04-02
Updated: 2025-12-08
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