Study on Surface Roughness Muring Metal Manufacturing Process

In the paper, a crystal plasticity finite element method (CPFEM) model was developed based on ABAQUS to analyse the surface roughness transfer during metal manufacturing. The simulation result shows a good agreement with the experimental result in the flattening of surface asperity, and the surface roughness decreases significantly with an increase of reduction with considering friction effect. Lubrication can delay surface asperity flattening. The effect of surface roughness on produced metal defect (crack) was also studied, and the surface roughness affects the crack initiation significantly in cold strip rolling. In addition, the surface roughness variation along the metal plate width contributes to stress distribution and then inhibition of crack nucleation.

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Surface Roughness and Wear of Work Roll Containing Ti in Cold Strip Rolling

Frontiers in Materials Science and Technology - Advanced Materials Research ◽

10.4028/0-87849-475-8.157 ◽

2008 ◽

pp. 157-160

Author(s):

H.C. Li ◽

Zheng Yi Jiang ◽

Anh Kiet Tieu ◽

Wei Hua Sun ◽

He Jie Li ◽

...

Keyword(s):

Surface Roughness ◽

Work Roll ◽

Strip Rolling ◽

Cold Strip Rolling

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Effect of Surface Texture on Deformation Behavior of Asperity in Cold Metal Forming

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.32.185 ◽

2008 ◽

Vol 32 ◽

pp. 185-188

Author(s):

Dong Bin Wei ◽

Zheng Yi Jiang ◽

Cheng Lu ◽

Ying De Tang ◽

A. Kiet Tieu

Keyword(s):

Metal Forming ◽

Deformation Behavior ◽

Rolling Direction ◽

Compression Tests ◽

Strip Rolling ◽

Resistance To Deformation ◽

Cold Metal ◽

Cold Strip Rolling ◽

Effect Of Surface ◽

Peak Value

It was impossible to obtain the transverse friction along the strip width in most previous studies of cold strip rolling because the surface roughness lays were assumed to be vertical to the rolling direction. In this study, several types of oblique roughness textures were manufactured on aluminum samples and compression tests were carried out to obtain the effect of different textures on the deformation behavior of surface asperity. Different surface textures resulted in very different peak value of stress. It was found that stress was high and changed dramatically at the initial compression stage but tended to be stable when the total reduction increased. The asperity of which the top angle is 160° showed relatively high resistance to deformation.

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The Effect of Surface Roughness on Fitting Strength of Shrink Fit Between Ceramic and Metal Elements

Journal of Vibration and Acoustics ◽

10.1115/1.3269859 ◽

1989 ◽

Vol 111 (3) ◽

pp. 318-325 ◽

Cited By ~ 8

Author(s):

K. Kato ◽

T. Kayaba ◽

I. Nitta ◽

S. Shimoda

Keyword(s):

Surface Roughness ◽

Plastic Deformation ◽

Elevated Temperatures ◽

Simple Technique ◽

Accurate Estimation ◽

Metal Elements ◽

Experimental Values ◽

Shrink Fit ◽

Effect Of Surface ◽

Good Agreement

Shrink fit is a basic and simple technique for joining metal elements. But it is not suitable for ceramic and metal elements, especially at elevated temperatures. For the accurate estimation of fitting strength between ceramic and metal elements, an understanding of the deformation of surface micro-asperities during contact is introduced in this paper. The elastic deformation of a shaft and a cylinder and the elastic-plastic deformation of the asperities were taken into consideration for the theoretical fitting strength. Theoretical estimations of fitting strength between a ceramic shaft and a metal cylinder showed good agreement wtih experimental values in various fitting interferences and at temperatures of 20°C–180°C.

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Surface Roughness and Wear of Work Roll Containing Ti in Cold Strip Rolling

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.32.157 ◽

2008 ◽

Vol 32 ◽

pp. 157-160 ◽

Cited By ~ 1

Author(s):

H.C. Li ◽

Zheng Yi Jiang ◽

A. Kiet Tieu ◽

Wei Hua Sun ◽

Hei Jie Li ◽

...

Keyword(s):

Surface Roughness ◽

Surface Finish ◽

Lower Surface ◽

Work Roll ◽

Roll Surface ◽

Strip Rolling ◽

Wear Process ◽

Roll Wear ◽

Work Rolls ◽

Cold Strip Rolling

The consumption of work rolls in cold strip mills is significant. One of the key issues for work rolls is the surface roughness which affects the rolling stability and surface finish of the strip. The produced strip has lower surface finish if the roll surface roughness is large. However, if the roll surface roughness is small, it is not helpful for establishing the rolling process, which will reduce the productivity. In this case, a laser treatment is employed to increase the value of roll surface roughness. In order to reduce the times of roll grinding, the cold strip mill and roll manufacturers have developed new types of rolls such as the rolls containing Ti to increase the roll wear resistance in cold strip rolling. Results show that the new 4CrTi roll has a significant advantage of preventing decrease of the roll surface roughness. The size and generation of particles during roll wear process and the effect of Ti on roll wear have been discussed.

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Numerical and Experimental Investigation of Friction in Cold Strip Rolling

World Tribology Congress III, Volume 1 ◽

10.1115/wtc2005-63394 ◽

2005 ◽

Cited By ~ 1

Author(s):

Cheng Lu ◽

A. Kiet Tieu

Keyword(s):

Experimental Investigation ◽

Tangential Force ◽

Frictional Coefficient ◽

Rolling Process ◽

Deformation Model ◽

Strip Rolling ◽

The Coefficient Of Friction ◽

Contact Mechanism ◽

Cold Strip Rolling ◽

Good Agreement

To obtain a better understanding of friction and contact mechanism in cold strip rolling, a refined asperity ploughing model and an asperity elastic deformation model have been developed. It is found that the asperity angles α1 and α2 significantly affect the tangential force and the coefficient of friction respectively. The theoretical prediction is in good agreement with the experimental results in Ref. [7]. The developed models can predict a reasonable frictional coefficient if it is applied to the cold rolling process.

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Effect of Surface Finish of Braced Pillars on Stress Distribution of Vacuum Plate Glass

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.431-432.450 ◽

2010 ◽

Vol 431-432 ◽

pp. 450-453

Author(s):

Rui Hong Zhang

Keyword(s):

Surface Roughness ◽

Stress Distribution ◽

Service Life ◽

High Precision ◽

Surface Finish ◽

Plate Glass ◽

Experimental Result ◽

Glass Quality ◽

Maximal Stress ◽

Effect Of Surface

The braced pillars were machined by grinding and spark machining. 3-D topography and surface roughness of two kinds of braced pillars were measured. The effect of two kinds of braced pillars on stress distribution of vacuum plate glass was analyzed by electrometric method, and was in comparison. The stress distribution of their important sides was obtained such as sealing side, supporting side and braced pillar. The experimental result showed that maximal stress of braced pillar for vacuum glass occurred in the end side of each braced pillar. Controlling high precision of the brace height and good flatness of the glass sheet considerably improve vacuum plate glass quality, such as its strength, its dependability and service life.

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Experimental investigation and modelling of light scattering in a-Si:H solar cells deposited on glass/ZnO:Al substrates

MRS Proceedings ◽

10.1557/proc-715-a13.3 ◽

2002 ◽

Vol 715 ◽

Cited By ~ 3

Author(s):

J. Krc ◽

M. Zeman ◽

O. Kluth ◽

F. Smole ◽

M. Topic

Keyword(s):

Surface Roughness ◽

Experimental Investigation ◽

Solar Cells ◽

Angular Distribution ◽

Light Scattering ◽

Optical Model ◽

Distribution Functions ◽

Interface Roughness ◽

Scattering Parameters ◽

Good Agreement

AbstractThe descriptive scattering parameters, haze and angular distribution functions of textured ZnO:Al transparent conductive oxides with different surface roughness are measured. An approach to determine the scattering parameters of all internal interfaces in p-i-n a-Si:H solar cells deposited on the glass/ZnO:Al substrates is presented. Using the determined scattering parameters as the input parameters of the optical model, a good agreement between the measured and simulated quantum efficiencies of the p-i-n a-Si:H solar cells with different interface roughness is achieved.

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