Zur hydrodynamischen Theorie des Warmwalzens

Kneschke, A.

doi:10.1002/srin.195802221

Cited by 6 publications

(5 citation statements)

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“…The hydrodynamic roll gap model with symmetric friction was first suggested by Kneschke [28,32,37]. This work forms the basis for the following model derivation.…”

Section: Hydrodynamic Theorymentioning

confidence: 99%

“…Because the values of the body forces f (usually just gravity) and the convective acceleration v • ∇v are much smaller than the other terms, f and ρv •∇v are neglected too. It is further assumed that the bite angle α d is small, which permits to approximate the arc of contact as slightly inclined plane surfaces and a similar ansatz as for plane-parallel plates can be used (see [37]). Thus, we neglect the velocity v y in vertical direction and we assume that the remaining component v x only marginally changes with respect to x.…”

Section: Hydrodynamic Theorymentioning

confidence: 99%

“…In [37], Kneschke uses the approximations sin(α) ≈ α and cos(α) ≈ 1 − α 2 2 for the trigonometric functions in Eq. 18.…”

Section: Rolling Forcementioning

confidence: 99%

See 2 more Smart Citations

Asymmetric hydrodynamic roll gap model and its experimental validation

Müller

Steinboeck

Prinz

et al. 2018

Int J Adv Manuf Technol

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In tandem hot strip rolling mills, different friction between the rolls and the strip material on the upper and lower strip surface can occur due to asymmetric surface temperatures or different conditions of oil lubrication. To capture these effects, this paper presents a hydrodynamic roll gap model with asymmetric friction. Based on similarities between the rolled material and viscous fluids, fluid mechanics theory is used to derive this model. Due to the nature of this model, the influence of the rolling speed is inherently taken into account, which allows an accurate prediction of the rolling force and the forward slip. As an analytic solution for the hydrodynamic roll gap model is available, it is well suited for online applications in rolling plants. For validation of the proposed model, an experiment with asymmetric work roll roughness was performed. A specimen of steel strip with copper pins inserted was repeatedly rolled to visualize the material flow inside the roll gap for multiple passes. The resulting deformed copper pins were cut out of the strip and show good agreement with the deformation profiles calculated by the developed model.

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“…The hydrodynamic roll gap model with symmetric friction was first suggested by Kneschke [28,32,37]. This work forms the basis for the following model derivation.…”

Section: Hydrodynamic Theorymentioning

confidence: 99%

Section: Hydrodynamic Theorymentioning

confidence: 99%

See 1 more Smart Citation

Asymmetric hydrodynamic roll gap model and its experimental validation

Müller

Steinboeck

Prinz

et al. 2018

Int J Adv Manuf Technol

View full text Add to dashboard Cite

show abstract

“…For several years, the hydrodynamic forming theories of rolling and wire drawing developed at the Bergakademie Freiberg by A. Kneschke were in the center of interest of research at the IMF. Data from numerous rolling trials were used to substantiate and prove the theoretical models.…”

Section: Developing a Scientific Base For Processing Technologiesmentioning

confidence: 99%

Research on Metal‐Forming Technologies at the TU Bergakademie Freiberg − Practice Oriented and Strongly Material Related

Lehnert

2016

steel research int.

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The article gives an overview on the historical development, specific features, and achievements of research on metal-forming technologies at the Institute of Metal Forming at the TU Bergakademie Freiberg. Being significantly involved in research on metal-forming technologies since 1928, the history of the institute reflects the general developments of this scientific subject since this time. The practical orientation of research and the specific focus on material-related issues and effects have been the major strengths of the Institute of Metal Forming. By using most modern laboratory facilities and experimental plants, relevant data are gained and used in order to induce new scientific developments and to find solutions for transferring these into technologies applicable in industrial production. With its specific concept which has been the basis of the successful development, the Institute of Metal Forming is well prepared to face future challenges in metal-forming technology.

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“…Bland -F. Ellis -H. Ford [3], H. Lippmann -O. Mahrenholtz [4], A. Zelikow [5], et al The rolling speed was assumed to have a dominating role, and the rolling process was described, not according to the laws of mechanics of rigid bodies, but according to the laws of hydromechanics. The basics and details of his theory are described in [6][7][8]. The derivation was based on the assumption that the rolling stock behaves as a ductile-plastic, homogeneous and isotropic medium with a constant temperature after reaching flow stress.…”

Section: Hydrodynamic Rolling Theory Of a Kneschkementioning

confidence: 99%

Deformation Inhomogeneity and Texture Development brought about in Steel Strip by Multi‐Step Cold Rolling

Lehnert

Kawalla

2005

steel research international

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Predicting the microstructure obtained in cold‐rolled strips is of major importance with regard to optimizing the production of deep‐drawing steels with high and defined mechanical and technological properties. By using the hydrodynamic rolling theory of A. Kneschke, it has been possible to determine the effects of the most important rolling parameters and also of the rolling strategy on the velocity field and on the in‐homogeneous distribution of deformation over the strip thickness. Rolling on experimental laboratory facilities has provided the opportunity to observe the texture evolution. The tests were carried out on two deep‐drawing steel grades IF and ULC. The initial thickness of the strip samples was 3.0 mm. The textures were determined at 3 locations over the strip thickness by means of pole figure measurements according to the X‐ray diffraction method.

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Zur hydrodynamischen Theorie des Warmwalzens

Cited by 6 publications

References 0 publications

Asymmetric hydrodynamic roll gap model and its experimental validation

Asymmetric hydrodynamic roll gap model and its experimental validation

Research on Metal‐Forming Technologies at the TU Bergakademie Freiberg − Practice Oriented and Strongly Material Related

Deformation Inhomogeneity and Texture Development brought about in Steel Strip by Multi‐Step Cold Rolling

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