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.

Estimation of Residual Stress in Cold Rolled Iron-Disks Using Magnetic and Ultrasonic Methods and Neutron Diffraction Technique

1994 ◽  
Vol 376 ◽  
Author(s):  
V.L. Aksenov ◽  
A.M. Balagurov ◽  
G.D Bokuchava ◽  
J. Schreiber ◽  
Yu.V. Taran Frank
Keyword(s):  
Residual Stress ◽  
Neutron Diffraction ◽  
Sheet Metal ◽  
Diffraction Method ◽  
Calibration Procedure ◽  
Rolled Sheet ◽  
Forming Process ◽  
Practical Applications ◽  
Ultrasonic Methods ◽  
Cold Rolled

ABSTRACTVariation of internal stress states in cold rolled sheet metal can essentially influence the result of forming processes. Therefore it is important to control the forming process by a practicable in line testing method. For this purpose magnetic and ultrasonic nondestructive methods are available. However, it is necessary to calibrate these techniques. This paper describes a first step of such a calibration procedure making use of the neutron diffraction method. On the basis of the diffraction results an assessment of the magnetic and ultrasonic methods for the estimation of residual stress in the cold rolled iron-disks was made. Reasonable measuring concepts for practical applications to forming processes with cold rolled sheet metal are discussed.

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.

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

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.

Methodology to Produce Locally Heat-Treated EN AW-5182 Aluminum Alloy Sheet Metal Parts

2012 ◽  
Vol 504-506 ◽  
pp. 113-118 ◽  
Author(s):  
Andreas Magnus Sulzberger ◽  
Marion Merklein ◽  
Wolfgang Staufner ◽  
Daniel Wortberg
Keyword(s):  
Sheet Metal ◽  
Material Flow ◽  
Sheet Thickness ◽  
Alloy Sheet ◽  
Second Step ◽  
Material Failure ◽  
Metal Parts ◽  
Sheet Metal Parts ◽  
Material Recovery ◽  
Heat Treated

Compared to steel, aluminum has a reduced formability. The consequence is that the drawability of aluminum needs to be extended. This can be achieved by a material recovery that takes place near the zones in which a material failure is initiated during deep drawing. In the considered process, first the aluminum component will be preformed to a specific stress state. In the second step, it will be partial heat treated, before the component is getting finished. Based on the selective intermediate introduction of heat, the material flow of the pre-drawn part is influenced in such a manner that the most highly stressed zones are subjected to further reduction in sheet thickness. This is possible by sacrificing material out of zones near the crack. These areas are referred to below as “sacrificial zones”. They depend on the position of the critical region as a result of the material pre-strain. In these regions, the temperature can be varied. This paper focuses on the development of a methodology to determine a layout of intermediate heat treatment of preformed aluminum sheet metal components. In order to determine such a layout, a principal part must be designed on which the methodology can be reviewed.

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.

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
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