Study on the Forming Mechanism for Second Step on Hollow Rotor Shaft by 4-Roll Cross Wedge Rolling

Yang, Yong Ming; Chen, Jiu Chuan; Cheng, Feng Wen; Zhao, Jun

doi:10.4028/www.scientific.net/amm.288.271

Cited by 4 publications

(2 citation statements)

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“…These methods allow for the production of (most often) semifinished products for further mechanical processing [ 13 ]. They are also used as semifinished products for die forging [ 14 ] or extrusion [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

The Chosen Aspects of Skew Rolling of Hollow Stepped Shafts

2021

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The paper presents chosen aspects of the skew rolling process of hollow stepped products with the use of a skew rolling mill designed and manufactured at the Lublin University of Technology. This machine is characterized by the numerical control of spacing between the working rolls and the sequence of the gripper axial movement, which allows for the individual programming of the obtained shapes of parts such as stepped axles and shafts. The length of these zones and the values of possibly realizable cross-section reduction and obtained outlines are the subject of this research paper. The chosen results regarding the influence of the technological parameters used on the course of the process are shown in the present study. Numerical modelling using the finite element method in Simufact Forming, as well as the results of experimental tests performed in a skew rolling mill, were applied in the conducted research. The work takes into account the influence of cross-section reduction of the hollow parts and the feed rate per rotation on the metal flow mechanisms in the skew rolling process. The presented results concern the obtained dimensional deviations and changes in the wall thickness determining the proper choice of technological parameters for hollow parts formed by the skew rolling method. Knowledge about the cause of the occurrence of these limitations is very important for the development of this technology and the choice of the process parameters.

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Section: Introductionmentioning

confidence: 99%

The Chosen Aspects of Skew Rolling of Hollow Stepped Shafts

2021

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“…The contact surface of the formed material and tools was described by the model of constant friction. Due to the fact that the compression process was conducted in hot working conditions, the friction factor assumed in the calculations was relatively high, m = 0.8 [14,15]. Moreover, it was assumed that the heat transfer coefficient for the couple material–tools was equal 20 kW/(m 2 ·K), whereas for material–environment, it was 0.35 kW/(m 2 ·K).…”

Section: Subject Of Studymentioning

confidence: 99%

Limits of the Process of Rotational Compression of Hollow Stepped Shafts

2019

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This article presents the results of theoretical–experimental testing of the process of rotational compression of hollow stepped shafts. The advantages of the technology and the potential area of its application were discussed. Further on, the limits of the rotational compression technology, preventing the manufacturing of high-quality products, were presented. The research was conducted on the basis of numerical modelling using the finite element method in Simufact Forming, as well as the results of experimental tests performed in a forging machine for rotational compression. On the basis of the results obtained, it can be stated that the process of rotational compression of hollow stepped shafts can be hindered by the following phenomena: uncontrolled slip, deformation of the semi-finished product wall, twisting of the formed steps, material cracking, and deformation of the cross-section of the formed steps. The possibility of those hindrances occurring depends heavily on the assumed technological parameters of the process. For this reason, knowledge of the cause of occurrence of those limitations is vital for the development of the technology and the choice of the process parameters.

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Evolution of microstructure of aluminum alloy hollow shaft in cross wedge rolling without mandrel

Peng

Zhang

et al. 2022

J. Cent. South Univ.

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Study on the Forming Mechanism for Second Step on Hollow Rotor Shaft by 4-Roll Cross Wedge Rolling

Cited by 4 publications

References 0 publications

The Chosen Aspects of Skew Rolling of Hollow Stepped Shafts

The Chosen Aspects of Skew Rolling of Hollow Stepped Shafts

Limits of the Process of Rotational Compression of Hollow Stepped Shafts

Evolution of microstructure of aluminum alloy hollow shaft in cross wedge rolling without mandrel

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