Abstract
In cold orbital forging (COF) processes, large stress, displacement and vertical vibration of the COF machine are bad for the quality of the part and the fatigue life of the COF machine. It is necessary to investigate the static and dynamic performance of the COF machine and provide methods for reducing the stress, displacement and vertical vibration of the COF machine. In this paper, finite element analysis, theoretical analysis, numerical simulation and experimental analysis were applied to study the static and dynamic performance of a 6300 KN COF machine. The static and dynamic analyses were verified effectively by carrying out strain and vertical vibration test experiments. In the static analysis, the large stress and displacement positions of the COF machine were mainly distributed near the working table and the junction between the working table and the column. Large stress and displacement will be bad for the quality of the part and the fatigue life of the COF machine. Structural optimizations of the COF machine include ribbed plates on the working table and beam. This structural optimization method of the COF machine obviously reduced the stress and displacement of the COF machine. When the angular velocities of the eccentric rings were 8π rad/s, the vertical vibration of the swing shaft is a low-frequency vibration. The existence of absorber obviously reduced the vertical vibration of the COF machine.
Highlights
Cold orbital forging (COF) is an advanced and complicated metal forming technology [1]
In order to improve the quality of the part and the fatigue life of the COF machine, investigations into the static performance and dynamic performance of the COF machine and methods of reducing stress displacement and vertical vibration are necessary
By analyzing the static and dynamic performance of the COF machine, we find that the large stress positions of the COF machine are mainly distributed near the working table and the junction between the working table and the inside of the column
Summary
Cold orbital forging (COF) is an advanced and complicated metal forming technology [1]. Compared with conventional forging technology, COF can reduce forming force, improve the flowing capability of metal and improve the loading state of the die. In the COF process, large stress, large displacement and vertical vibration of the COF machine are bad for the quality of the part and the fatigue life of the COF machine. In order to improve the quality of the part and the fatigue life of the COF machine, investigations into the static performance and dynamic performance of the COF machine and methods of reducing stress displacement and vertical vibration are necessary. Some research on static and dynamic analysis of mechanical components and structures has been carried out. In the static analysis aspect, Jiao et al [2]
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