Influence of Eccentricity on Movements of Orbital Head with Double Eccentric Structure in Orbital Forging

Wen-cheng, Feng; Yao, Wangui; Jiang, Peng

doi:10.1016/j.proeng.2014.10.332

Cited by 7 publications

(8 citation statements)

References 2 publications

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“…The torque of the motor is transmitted to the eccentricity rings by power transfer shafts. Cross sections of both ends of the output shafts will produce relative rotation under the torsion couple, where u represents the relative torsional angle, which can be calculated by equation (10).…”

Section: Horizontal Dynamic Model Of the Cof Machinementioning

confidence: 99%

“…7 Regarding COF kinematics, Han et al 8,9 revealed the kinematic mechanism of the COF machine and obtained kinematic equations of the COF machine. Feng et al 10 and Dong et al 11 presented the influence of structural parameters on the kinetic locus of a COF machine. Regarding the COF application, [12][13][14][15] investigated applications of COF in manufacturing spur bevel gears, gear racks, and rings.…”

Section: Introductionmentioning

confidence: 99%

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Research on the vibration model and vibration performance of cold orbital forging machines

Hua

Chen

Han

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part B:

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The vibration of cold orbital forging (COF) machines is a major issue for the quality of forging parts. It is therefore necessary to investigate the vibration of COF machines and provide some effective methods for reducing the vibration. In this paper, horizontal and vertical dynamic models of COF machines are established. These dynamic models are then effectively verified by conducting experiments. By using dynamic models of the COF machine, the vibration performance of the COF machine is investigated. To investigate methods for reducing the vibration of the COF machine, the effects of some key parameters on the vibration of the COF machine are studied, which include the eccentricities and rotation angular speeds of the inner eccentricity ring and the outer eccentricity ring, the amplitude and frequency of external excitation, and the equivalent stiffness and equivalent damping between swing shaft and bearing. Investigative conclusions can be drawn: During the COF process, vertical vibration is more drastic than horizontal vibration. A larger absolute difference between the eccentricities of the inner eccentricity ring and the outer eccentricity ring contributes to reducing the horizontal vibration of the COF machine. A larger equivalent stiffness and a larger equivalent damping between the swing shaft and bearing, a smaller amplitude and a smaller frequency of the external excitation contribute to reducing the vertical vibration of the COF machine.

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Section: Horizontal Dynamic Model Of the Cof Machinementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on the vibration model and vibration performance of cold orbital forging machines

Hua

Chen

Han

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…[20][21][22][23][24][25] investigated some effective structure optimization methods for improving the performance of machines. However, investigations into the COF machine are mainly investigations of the deformation mechanism, forging force and kinematic mechanism of COF [26][27][28][29][30][31][32][33], and few investigations into the static performance and dynamic performance of the COF machine have been carried out.…”

Section: Introductionmentioning

confidence: 99%

Static and Dynamic Analysis of a 6300 KN Cold Orbital Forging Machine

Chen

Wang

et al. 2020

Processes

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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.

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“…In terms of kinetic locus of the upper tool, Hu and Che [24] analyzed the kinetic locus of the upper tool in PXW cold orbital forging machine. Feng et al [25] examined the influences of eccentricity of two eccentricity rings on the kinetic locus of the upper tool. However, the above researches only aimed at the kinetic locus of one point in the axis of the upper tool, while the researches on the kinetic locus of one point in the working surface of the upper tool were scarce.…”

Section: Introductionmentioning

confidence: 99%

Calculation of kinetic locus of upper tool in cold orbital forging machine with two eccentricity rings

2015

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In cold orbital forging machine with two eccentricity rings, the kinetic locus of the upper tool includes two types. The first one is the kinetic locus of one point in the axis of the upper tool, which is produced by the motion of the two eccentricity rings. The second one is the kinetic locus of one point in the working surface of the upper tool, which is produced by the first type of kinetic locus. Both types of kinetic locus of the upper tool is critical to cold orbital forging. The first one has great influences on the deformation of cold orbital forged components and the second one can be used to make the intervention examination between the upper tool and components. So this paper aims at obtaining the kinetic locus of the upper tool in cold orbital forging machine with two eccentricity rings so as to better design and check the cold orbital forging tools. Firstly, a model of analyzing the kinetic locus of the upper tool is developed. Then, the general equations of the kinetic locus of the upper tool, which can describe the kinetic locus of the arbitrary point in the upper tool under all kinds of geometric and kinematic relations between the two eccentricity rings in cold orbital forging machine, are achieved. Finally, the characteristics and applications of the kinetic locus of the upper tool are discussed based on these equations. This study has great significances for adjusting the two eccentricity rings of the machine to control the motion of the upper tool and designing and checking the cold orbital forging tools.

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Influence of Eccentricity on Movements of Orbital Head with Double Eccentric Structure in Orbital Forging

Cited by 7 publications

References 2 publications

Research on the vibration model and vibration performance of cold orbital forging machines

Research on the vibration model and vibration performance of cold orbital forging machines

Static and Dynamic Analysis of a 6300 KN Cold Orbital Forging Machine

Calculation of kinetic locus of upper tool in cold orbital forging machine with two eccentricity rings

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