Lubricating Performances of Nano Organic-Molybdenum as Additives in Water-Based Liquid during Cold Rolling

2011 ◽  
Vol 337 ◽  
pp. 550-555 ◽  
Author(s):  
Bing Wang ◽  
Jian Lin Sun ◽  
Yuan Yuan Wu
Keyword(s):  
Cold Rolling ◽  
Rolling Force ◽  
Steel Strip ◽  
Optical Microscope ◽  
Wear Scar Diameter ◽  
Strip Surface ◽  
Steel Strips ◽  
Water Based ◽  
Save Energy ◽  
Steel Balls

The non-parathion nano organic molybdenum (Nano-Mo) was adopted to substitute for the conventional extreme-pressure and anti-wear additives, uniformly dispersed in water-based cold rolling liquid for steel strips. The tribological properties of the water-based cold rolling liquid were tested by the four-ball machine, and the lubricity of the cold-rolling liquid for steel strip was evaluated on the 4-high cold rolling experiments. Besides, the worn surfaces of the steel balls were observed by an optical microscope. Results indicated that Nano-Mo as additive in water-based cold rolling liquid, compared with the conventional emulsions, PB values was increased by 4%, and friction coefficient and wear scar diameter were decreased by 10.8% and 13.1%, the lubricity of rolling liquid was verified by cold rolling test which showed that this liquid had the excellent lubricant performance to reduce the rolling force, save energy consumption and get thinner strip. Optical microscope was used to observe the strips surface which showed that strip surface streaks were clear, scratches were less and shallow. By roughness test and EDS analysis, defects were filled with nanoparticles, friction and wear were reduced effectively. In addition, tensile properties had been studied after rolling lubrication, but the results showed no significant effect.

Research on the Entire Roll Type Shape Meter of Cold Rolling Strip and its Industrial Application

2012 ◽  
Vol 572 ◽  
pp. 359-363 ◽  
Author(s):  
Bing Qiang Yu ◽  
Li Po Yang ◽  
Hong Min Liu
Keyword(s):  
Cold Rolling ◽  
Shape Control ◽  
Steel Strip ◽  
Digital Signal ◽  
Strip Surface ◽  
Loop Control ◽  
Technical Requirements ◽  
Roll Type ◽  
Shape Detecting ◽  
Close Loop Control

In order to increase shape measuring precision of cold strip, based on the shape detecting principle and the digital signal technology, a new entire roll type shape meter is developed thorough theoretical analysis and industrial adjustment to develop the shape detecting roll, the shape signal processing method, the original signal compensation mechanism and so on. The shape meter has good performance and stability, which can effectively avoid the scratch of steel strip surface, accurately detect real online strip shape and provide accurate online shape datum for shape control system. It was applied in 1250 mm cold rolling mill, the actual industrial tests prove that the shape signal was stable and reliable, met the harsh condition and the online technical requirements, and could improve shape quality significantly. And the shape close loop control of the 0.18 mm thin cold strip was successful realized.

Study on the Lubricating Performance of Nano-TiO2 in Water-Based Cold Rolling Fluid

2015 ◽  
Vol 817 ◽  
pp. 219-224 ◽  
Author(s):  
Jian Lin Sun ◽  
Zuo Xin Zhu ◽  
Peng Fei Xu
Keyword(s):  
Cold Rolling ◽  
Tribological Behavior ◽  
Work Piece ◽  
Wear Properties ◽  
Laser Confocal Microscopy ◽  
Water Based ◽  
Rolling Experiment ◽  
Steel Balls ◽  
Rolled Surface ◽  
Lubricant Performance

A type of water-based cold rolling fluid has been developed by adding TiO2 nanoparticles. The tribological behavior of nanoTiO2 water-based rolling fluid was investigated by using four-ball machine. The worn surfaces of the steel balls were analyzed by using OLYMPUS laser confocal microscopy. Results indicate that nanoTiO2 nanoparticles significantly improved the anti-wear properties in the way of micro-ball bearing and perfecting the tribological behavior of water-based rolling fluid. The cold rolling experiment shows that the nanoTiO2 water-based rolling fluid had a good rolling lubricant performance under the condition of concentration of 0.7wt.% for the upper limit. The nanoTiO2 water-based rolling fluid can not only decrease the minimum rolling gauge and the surface roughness of the work piece, but also prevent direct contact between roller and work piece which could lead to the rolled surface scratches and adhesion defects.

scholarly journals Smoothing Complete Feature Pyramid Networks for Roll Mark Detection of Steel Strips

Sensors ◽  
2021 ◽  
Vol 21 (21) ◽  
pp. 7264
Author(s):  
Qiwu Luo ◽  
Weiqiang Jiang ◽  
Jiaojiao Su ◽  
Jiaqiu Ai ◽  
Chunhua Yang
Keyword(s):  
Surface Defects ◽  
Steel Strip ◽  
Large Area ◽  
Strip Surface ◽  
Steel Strips ◽  
Surface Image ◽  
High Resolution Images ◽  
Feature Pyramid ◽  
Hot Rolled ◽  
Hot Rolled Steel

Steel strip acts as a fundamental material for the steel industry. Surface defects threaten the steel quality and cause substantial economic and reputation losses. Roll marks, always occurring periodically in a large area, are put on the top of the list of the most serious defects by steel mills. Essentially, the online roll mark detection is a tiny target inspection task in high-resolution images captured under harsh environment. In this paper, a novel method—namely, Smoothing Complete Feature Pyramid Networks (SCFPN)—is proposed for the above focused task. In particular, the concept of complete intersection over union (CIoU) is applied in feature pyramid networks to obtain faster fitting speed and higher prediction accuracy by suppressing the vanishing gradient in training process. Furthermore, label smoothing is employed to promote the generalization ability of model. In view of lack of public surface image database of steel strips, a raw defect database of hot-rolled steel strip surface, CSU_STEEL, is opened for the first time. Experiments on two public databases (DeepPCB and NEU) and one fresh texture database (CSU_STEEL) indicate that our SCFPN yields more competitive results than several prestigious networks—including Faster R-CNN, SSD, YOLOv3, YOLOv4, FPN, DIN, DDN, and CFPN.

Flatness Measurement of Steel Strips Based on one-Step Phase Shift Method

2011 ◽  
Vol 230-232 ◽  
pp. 54-58
Author(s):  
Ke Xu ◽  
Peng Zhou ◽  
Hui Yan Zhang
Keyword(s):  
Phase Shift ◽  
Steel Strip ◽  
Measuring System ◽  
Surface Measurement ◽  
Strip Surface ◽  
Steel Strips ◽  
One Step ◽  
New Formula ◽  
Phase Shift Method ◽  
Flatness Measurement

Flatness is a crucial parameter describing geometry of the steel strip surface. Measurement of flatness is very important for control of strip shapes. In the paper, the phase shift algorithm was introduced in measurement of flatness, and a new flatness measuring system based on the phase shift technique was developed. A new formula was derived to compute phase value from one single fringe image, which made higher spatial resolution. The system can avoid adverse effects caused by motion of the strip. Compared with present flatness measuring systems, the system presented in the paper gained more accurate results of flatness measurement.

Effects of Lubrication in Ferrite Rolling of Interstitial Free Steel

2013 ◽  
Vol 773-774 ◽  
pp. 186-191 ◽  
Author(s):  
Ning Kong ◽  
Kiet Tieu ◽  
Hong Tao Zhu ◽  
Qiang Zhu ◽  
Peter Gandy
Keyword(s):  
Solid Lubricant ◽  
Rolling Force ◽  
Steel Strip ◽  
Lubricating Oil ◽  
Interstitial Free ◽  
Strip Surface ◽  
Interstitial Free Steel ◽  
Ferrite Rolling ◽  
Roll Roughness ◽  
Lubrication Conditions

Ferrite rolling of interstitial free steel strip in the temperature range 650-850°C can effectively reduce furnace costs and scale formation as a result of lower strip reheating temperatures. Different lubrication conditions of lubricating oil, solid lubricant and dry condition were used during ferrite rolling tests of thin interstitial free steel strip on a 2-high Hille 100 experimental rolling mill. Different rolling speed, rolling temperature and reductions were applied to the rolling process. The rolling force and roll roughness were affected by the lubrication conditions and rolling parameters. Solid lubricant indicated an improved performance in terms of the roll roughness, as well as the oxidation property of the strip surface during ferrite rolling.

scholarly journals An Experimental Investigation of Steel Surface Topography Transfer by Cold Rolling

Micromachines ◽  
2020 ◽  
Vol 11 (10) ◽  
pp. 916
Author(s):  
Dong Xu ◽  
Quan Yang ◽  
Xiaochen Wang ◽  
Hainan He ◽  
Youzhao Sun ◽  
...  
Keyword(s):  
Cold Rolling ◽  
Surface Topography ◽  
Steel Strip ◽  
Reduction Rate ◽  
Rolling Process ◽  
Large Field ◽  
Initial Surface ◽  
Scale Invariant ◽  
Strip Surface ◽  
The Matrix

Automobile and household appliance panels require steel strips with extremely high-quality surfaces. Therefore, an in-depth study of the surface topography transfer of the steel strip during the rolling process is of considerable significance for improving product quality. In this study, the scale-invariant feature transform (SIFT) algorithm is used to realize the large-field stitching and the correspondence measurement of the surface topography of the roll and strip. The surface topography transfer mechanism and microconvex change law during cold rolling are revealed. Further analysis is conducted regarding the effects of different reduction rates and the initial surface topography of the roll on the formation of strip surface topography. Experimental results reveal that the furrow phenomenon occurs during the rolling process owing to the backward slip effect but is eliminated by the elastoplastic deformation of the matrix and the forward slip action. No furrow occurred along the width direction of the strip. With an increase in the rolling reduction rate, the transfer rate increases, and the strip surface topography is closer to the roll surface topography. Under the same rolling roughness condition and a small reduction rate (5%), the transfer degree increases remarkably with a rise in the reduction rate and increases slowly as the reduction rate continues to grow (from 7 to 10%). This study serves as a theoretical basis for the subsequent improvement of the surface quality of cold rolled strips.

Study of the Development of Heterogeneous Grain Size in the Through-Thickness Direction of Hot Rolled ELC Steels

2007 ◽  
Vol 539-543 ◽  
pp. 4220-4225
Author(s):  
Frans Leysen ◽  
Jan Penning ◽  
Yvan Houbaert
Keyword(s):  
Penetration Depth ◽  
Texture Analysis ◽  
Grain Growth ◽  
Hot Rolling ◽  
Steel Strip ◽  
Abnormal Grain Growth ◽  
Thickness Direction ◽  
Strip Surface ◽  
Steel Strips ◽  
Hot Rolled

The present study aims to investigate the mechanism of the development of abnormal grain sizes in the through-thickness direction of hot rolled steel strips. For this purpose, industrially prepared steel strips were further hot rolled in a laboratory hot rolling mill, setting a variety of rolling parameters. As found, the deformation rate in the hot rolling practice exerts an important role in explaining the mechanism of abnormal grain growth, especially in the close vicinity of the strip surface. Furthermore, the influence of the cooling penetration depth, induced by the roll contact was examined closely, as this phenomenon might support abnormal grain growth mechanisms. Additional information was found in performing a texture analysis in the throughthickness direction of the steel strips, in accordance with the optical metallurgical survey of the microstructures. It will be shown that, the combination of particular hot rolling parameters provokes the occurrence of abnormal grain growth in the through-thickness direction of the ELC steel strips. These particular conditions were considered to be related to the finish hot rolling temperature and thus the roll cooling penetration depth imposed on the steel strip, the finishing reduction degree and especially the strain rate conditions. Moreover, the observed abnormal grain growth is sensitive to the coiling temperature applied. From the experiments, it can be concluded that the mechanism of the formation of a large grained ferrite band below the strip surface is strongly influenced by the development of a fine-grain ferrite layer at some distance below the strip surface. The existence of this layer of very small ferrite grains can be explained on the basis of texture analysis and calculations based on literature data. In this way, it was considered that dynamic recrystallisation of austenite at some depth below the steel strip surface is of most significance in supporting the development of abnormally large ferrite grains. In this paper, further considerations on the mechanism of the abnormal grain growth phenomenon will be dealt with.

scholarly journals Microstructure and Mechanical Properties of an Austenitic CrMnNiMoN Spring Steel Strip with a Reduced Ni Content

Crystals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 392
Author(s):  
Christina Schröder ◽  
Marco Wendler ◽  
Olena Volkova ◽  
Andreas Weiß
Keyword(s):  
Mechanical Properties ◽  
Cold Rolling ◽  
Rolling Force ◽  
Steel Strip ◽  
Total Elongation ◽  
Strength Properties ◽  
Spring Steel ◽  
Rolling Temperature ◽  
Rolled Strip ◽  
Initial State

The article presents the mechanical properties of the austenitic stainless steel X5CrMnNiMoN16-4-4 after deformation by cold rolling and subsequent short-term tempering (deformation and partitioning (D&P) treatment). Tensile strengths of 1700–900 MPa and beyond were achieved both after work hardening and in the D&P-treated strip. The initial state of austenite in terms of grain size and pre-strengthening, as well as the selected cold rolling temperature significantly influenced the deformation-induced formation of α’ martensite and thus the flow and hardening behavior of the steel. The usage of two different rolling temperature regimes showed that the strength properties in the cold strip can be specifically adjusted. Lower deformation-induced martensite fractions enabled a larger thickness reduction of the strip without increasing the rolling force, while high deformation-induced martensite fractions led to strong hardening at low deformation levels. The D&P-treatment permits the strength of the cold-rolled strip with a predominantly austenitic microstructure to be increased to the required level. The total elongation of such a D&P strip was well over 2%. The D&P treatment of the spring steel strip is a cost-effective alternative to conventional tempering treatment.

Research on New Shapemeter of Cold Rolling Thin Strip

2013 ◽  
Vol 710 ◽  
pp. 238-242
Author(s):  
Bing Qiang Yu ◽  
Li Po Yang
Keyword(s):  
Cold Rolling ◽  
Shape Control ◽  
Steel Strip ◽  
Digital Signal ◽  
Thin Strip ◽  
Strip Surface ◽  
Technical Requirements ◽  
Strip Shape ◽  
Industrial Adjustment ◽  
Shape Detecting

Based on the shape detecting principle and the digital signal technology, a new shape meter was developed thorough theoretical analysis and industrial adjustment to develop the shape detecting roll, the shape signal processing method, the original signal compensation mechanism and so on. The shape meter has good performance and stability, which can effectively avoid the scratch of steel strip surface, accurately detect real online strip shape and provide accurate online shape datum for shape control system. It was applied in 1250 mm cold rolling mill, the actual industrial tests prove that the shape signal was stable and reliable, met the harsh condition and the online technical requirements, and could improve shape quality significantly.

A Study on the Relationship Between the Variation of Rolling Parameters and the Vibration Characteristics of Twenty-High Rolling Mill

2016 ◽  
Author(s):  
Shao Yimin ◽  
Rao Meng ◽  
Yang Qihui ◽  
Yilin Yuan
Keyword(s):  
Dynamic Model ◽  
Rolling Mill ◽  
Rolling Force ◽  
Steel Strip ◽  
Vibration Characteristics ◽  
Strip Surface ◽  
Rolling Parameter ◽  
Adjustment Strategy ◽  
Chatter Marks

As a common defect in the production of high-quality steel strip, chatter marks are easily found on the strip surface which may resulting from inappropriate variation of rolling parameters of a twenty-high rolling mill and the quality of the strip surface can be significantly affected. Therefore, it is critical to understand the underlying relationship between the vibration mechanisms of chatter marks and rolling parameters, furthermore, an appropriate adjustment strategy of rolling parameters is needed to improve the quality of the strip surface. To addressing this problem, a dynamic model of the twenty-high rolling mill, coupling the vertical and horizontal vibrations (because of the variation in friction tension forces), is proposed to investigate the vibration characteristics under different rolling conditions. Based on this dynamic model, effects of rolling force, rolling speed and fluctuations of tension on the vibration of the twenty-high rolling mill are studied. Finally, a rolling parameter adjustment strategy is discussed and presented based on the research results.

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