Analysis of Stripe Defects on the Cold Rolled Aluminum Strip Surface

2018 ◽  
pp. 667-672
Author(s):  
Yan Li ◽  
Lei Xia ◽  
Yiqing Chen ◽  
Peng Gao ◽  
Bin Zhong ◽  
...  
Keyword(s):  
Strip Surface ◽  
Aluminum Strip ◽  
Rolled Aluminum ◽  
Cold Rolled

Design and Implementation of the Cold-Rolled Aluminum Plate Surface On-Line Defect Detection System

2013 ◽  
Vol 712-715 ◽  
pp. 2323-2326
Author(s):  
Xing Guang Qi ◽  
Hai Lun Zhang ◽  
Xiao Ting Li
Keyword(s):  
High Speed ◽  
Surface Defects ◽  
Detection System ◽  
Aluminum Plate ◽  
Gigabit Ethernet ◽  
Accurate Detection ◽  
High Processing Speed ◽  
Rolled Aluminum ◽  
On Line ◽  
Cold Rolled

This paper presents an on-line surface defects detection system based on machine vision, which has high speed architecture and can perform high accurate detection for cold-rolled aluminum plate. The system consists of high speed camera and industrial personal computer (IPC) array which connected through Gigabit Ethernet, achieved seamless detection by redundant control. In order to acquire high processing speed, single IPC as processor receives from and deals with only one or two cameras' image. Experimental results show that the system with high accurate detection capability can satisfy the requirement of real time detection and find out the defects on the production line effectively.

Residual Stress Distribution through Thickness in Cold-Rolled Aluminum Sheet

2014 ◽  
Vol 622-623 ◽  
pp. 1000-1007 ◽  
Author(s):  
Nobuyuki Hattori ◽  
Ryo Matsumoto ◽  
Hiroshi Utsunomiya
Keyword(s):  
Residual Stress ◽  
Friction Coefficient ◽  
Stress Distribution ◽  
Aspect Ratio ◽  
Rolling Direction ◽  
Contact Length ◽  
Residual Stress Distribution ◽  
Aluminum Sheet ◽  
Rolled Aluminum ◽  
Cold Rolled

Distribution of residual stress through the thickness of a cold-rolled aluminum sheet is analyzed by the elastic-plastic finite element method under plane strain condition. Single-pass rolling of 2mm-thick aluminum sheet is considered. Influences of roll diameterD, reduction in thicknessr, and friction coefficientμare investigated. When the friction is low (μ= 0.1 and 0.2), and the case with smaller rolls (D= 130 mm) and low reduction (r= 5%), the residual stress in the rolling direction is compressive at surface and tensile around the layer quarter deep from the surface. While in the case with larger rolls (D= 310 mm) and high reduction (r= 30%), the stress is tensile at surface and the stress decreases to compressive with increasing depth from surface. In other words, with low friction, the residual stress distribution strongly depends on the aspect ratio (contact length / mean thickness) of the roll bite. On the other hand, when the friction coefficient is high (μ= 0.4), the residual stress is compressive at surface regardless of roll diameter and reduction. It means that the friction makes the residual stress at surface more compressive. It is found that the relationship between the residual stress at surface and the aspect ratio is almost linear, and that the slope depends on the friction coefficient.

Static Recrystallization in Aluminum/Graphene Composites

2021 ◽  
Vol 1016 ◽  
pp. 1636-1641
Author(s):  
Xiao Dong Wu ◽  
Xiao Li Liu ◽  
Ling Fei Cao ◽  
Guang Jie Huang
Keyword(s):  
Annealing Temperature ◽  
Static Recrystallization ◽  
Recrystallization Behavior ◽  
High Annealing Temperature ◽  
Graphene Composite ◽  
Pinning Effect ◽  
High Annealing ◽  
Rolled Aluminum ◽  
Strong Pinning ◽  
Cold Rolled

The aim of this work was to analyze the recrystallization behavior of cold rolled Aluminum/graphene composites during annealing. The Aluminum/graphene composite was cold rolled firstly, and then annealed at different temperature (250°C, 300°C, 350°C, 400°C) and for various time (1 h, 2 h, 8 h, 32 h). Full recrystallization did not occur until the annealing temperature was above 300 °C. With annealing temperature increasing from 250 to 300°C, the hardness of the composites decreased from 49.6 to 27.6 HV. Grain growth were not observed at high annealing temperature and longer annealing time, which suggested that Graphene has strong pinning effect on the grain boundary of Aluminum.

Mechanical properties of previously annealed or cold rolled aluminum submitted to tension/bending

1991 ◽  
Vol 9 (4) ◽  
pp. 213-219 ◽  
Author(s):  
R. Cirino ◽  
A. E. M. Pertence ◽  
P. R. Cetlin
Keyword(s):  
Mechanical Properties ◽  
Rolled Aluminum ◽  
Cold Rolled

Analysis and Control the Pressed into Defects of Acid Rolling Strip Foreign Body

2013 ◽  
Vol 785-786 ◽  
pp. 1099-1103
Author(s):  
Jian Wei Yang ◽  
Jing Wu
Keyword(s):  
Foreign Body ◽  
Raw Materials ◽  
Full Range ◽  
Raw Material ◽  
Rolled Strip ◽  
Strip Surface ◽  
Whole Process ◽  
Strip Shape ◽  
Rolling Strip ◽  
Cold Rolled

There are two reasons to causes of defects of acid rolling line equipment and hot-rolled raw materials problems, so it is necessary to analyse the cold-rolled strip surface foreign body pressed into the defect microstructure and composition. It is found that this defect can be eliminated by improving the quality of the raw material, controlling strip shape, making reasonable squeezed roll transformation system, making the implementation of effective management of the full range of roll surface, carrying out the whole process of clean production, effectively controlling of the cold-rolled strip foreign body pressed into the generation of defects.

Research on Key Technology of Cold-Rolled Aluminum Plate Surface Defect Detection System

2013 ◽  
Vol 433-435 ◽  
pp. 915-918 ◽  
Author(s):  
Hai Lun Zhang ◽  
Xing Guang Qi ◽  
Xiao Ting Li
Keyword(s):  
Defect Detection ◽  
Surface Defect ◽  
Detection System ◽  
Aluminum Plate ◽  
Aluminum Surface ◽  
Image Processing Algorithm ◽  
Key Technologies ◽  
Rolled Aluminum ◽  
Surface Defect Detection ◽  
Cold Rolled

This paper presents the research of several key technologies during the implementation of cold-rolling aluminum surface defect detection system, including the difficulty of achieving these key technologies and the improvement of image processing algorithm. Through the installation and commissioning on actual production line, summarize and analyze the requirements of the hardware and software design for highly reflective aluminum plate, to achieve the control of product quality at present.

scholarly journals Material Flow in Ultrasonic Orbital Microforming

Metals ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 475 ◽  
Author(s):  
Wojciech Presz
Keyword(s):  
Sheet Metal ◽  
Material Flow ◽  
Middle Part ◽  
Microstructure Analysis ◽  
Inertia Force ◽  
Hardness Distribution ◽  
Micro Hardness ◽  
Rolled Aluminum ◽  
Cold Rolled ◽  
Orbital Forging

Ultrasonic orbital microforming—UOM—uses the broadly understood idea of orbital forging but uses very different laws of physics. The only shaping force in this process is the inertia force resulting from the acceleration in the rotary motion of the workpiece. Micro specimen blanked from cold rolled aluminum sheet metal was used in the applied UOM process. Only the upper and lower part of the sample is deformed that gives about 70% of volume. The rest—the middle part—remains undeformed. The final shape of the product is influenced by the shape of the inside of the die in which the UMO process is carried out. However, this effect is not a direct one. The product shape does not repeat the shape of the interior of the die. The preliminary experiments with modular micro-die have been performed on the way of controlling the shape of deformed micro-objects. The microstructure analysis has been done as well as micro-hardness distribution.

Structural evolution and phase formation in cold-rolled aluminum–nickel multilayers

2001 ◽  
Vol 49 (7) ◽  
pp. 1139-1151 ◽  
Author(s):  
H. Sieber ◽  
J.S. Park ◽  
J. Weissmüller ◽  
J.H. Perepezko
Keyword(s):  
Phase Formation ◽  
Structural Evolution ◽  
Rolled Aluminum ◽  
Cold Rolled

Annealing of a cold rolled aluminum single crystal

JOM ◽  
1954 ◽  
Vol 6 (2) ◽  
pp. 257-260 ◽  
Author(s):  
A. H. Lutts ◽  
P. A. Beck
Keyword(s):  
Single Crystal ◽  
Aluminum Single Crystal ◽  
Rolled Aluminum ◽  
Cold Rolled
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