scholarly journals Intelligent Recognition Model of Hot Rolling Strip Edge Defects Based on Deep Learning

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 223
Author(s):  
Dongcheng Wang ◽  
Yanghuan Xu ◽  
Bowei Duan ◽  
Yongmei Wang ◽  
Mingming Song ◽  
...  
Keyword(s):  
Hot Rolling ◽  
Detection Accuracy ◽  
Recognition Time ◽  
Common Edge ◽  
Edge Defect ◽  
Recognition Model ◽  
Single Defect ◽  
Rolling Strip ◽  
Defect Image ◽  
Edge Defects

The edge of a hot rolling strip corresponds to the area where surface defects often occur. The morphologies of several common edge defects are similar to one another, thereby leading to easy error detection. To improve the detection accuracy of edge defects, the authors of this paper first classified the common edge defects and then made a dataset of edge defect images on this basis. Subsequently, edge defect recognition models were established on the basis of LeNet-5, AlexNet, and VggNet-16 by using a convolutional neural network as the core. Through multiple groups of training and recognition experiments, the model’s accuracy and recognition time of a single defect image were analyzed and compared with recognition models with different learning rates and sample batches. The experimental results showed that the recognition model based on the AlexNet had a maximum accuracy of 93.5%, and the average recognition time of a single defect image was 0.0035 s, which could meet the industry requirement. The research results in this paper provide a new method and thought for the fine detection of edge defects in hot rolling strips and have practical significance for improving the surface quality of hot rolling strips.

Finite Element and Experimental Analysis of Edge Defects Formation during Orthogonal Cutting of SiCp/Al Composites

2012 ◽  
Vol 500 ◽  
pp. 146-151 ◽  
Author(s):  
Ning Hou ◽  
Li Zhou ◽  
Shu Tao Huang ◽  
Li Fu Xu
Keyword(s):  
Finite Element ◽  
Chip Formation ◽  
Defect Formation ◽  
Orthogonal Cutting ◽  
Cutting Speed ◽  
Rake Angle ◽  
Critical Transition ◽  
Cutting Depth ◽  
Edge Defect ◽  
Edge Defects

In this paper, a finite element method was used to dynamically simulate the process of the edge defects formation during orthogonal cutting SiCp/Al composites. The influence of the cutting speed, cutting depth and rake angle of the PCD insert on the size of the edge defects have been investigated by using scanning electron. According to the simulated results, it can be provided that the cutting layer material has an effect on transfer stress and hinder the chip formation in the critical transition stage, and the critical transition point and distance are defined in this stage. The negative shear phenomenon is found when the chip transit to the edge defects in the flexure deformation stage, so the process of the chip formation is the basis of the edge defects formation. In addition, the relationship between the nucleation and propagation direction of the crack and the variation of the edge defect shape on the workpiece was investigated by theory, and it found that the negative shear angle formation is the primary cause of the edge defect formation. A mixed mode crack is found in the crack propagation stage. The sizes of edge defects were measured by the experiment and simulation, and the edge defect size decrease with the increasing of tool rake angle, while increase with increasing cutting depth and cutting speed.

Research of Laser Welding for Hot Rolling Strip Steel

2011 ◽  
Vol 295-297 ◽  
pp. 2341-2344
Author(s):  
Ru Tao Zhong ◽  
Zhi Jun Huang ◽  
Yu Tao Wang
Keyword(s):  
Laser Welding ◽  
Hot Rolling ◽  
Steel Plate ◽  
Welding Process ◽  
Strip Steel ◽  
Rolling Strip ◽  
Breadth Ratio ◽  
Welding Defect ◽  
Fast Flow ◽  
Cooling Velocity

Focused on the question of laser welding break of hot rolling strip steel JZZ, The causings of defect of laser welding were studied experimentally with the Trumph TLF12000 fast-flow CO2 laser,. and the methods of avoiding the defect were porposed. The results showed that owing to the steel plate was thicker and big welding velocity, resulted in large depth/breadth ratio and high cooling velocity , the solidification crack occurred during welding process. When the method of laser welding with filling metal was used,the welding defect was avoided , the better performance index of weld as good as that of base metal is available.

An Investigation of the Effect of Speeds of Work Rolls on Rolling Strip

1995 ◽  
Vol 117 (3) ◽  
pp. 341-346 ◽  
Author(s):  
Zone-Ching Lin ◽  
Y. C. Cheng
Keyword(s):  
Hot Rolling ◽  
Rolling Force ◽  
Large Strain ◽  
Work Roll ◽  
Rolling Process ◽  
Analysis Model ◽  
Hot Rolling Process ◽  
Rolling Strip ◽  
Work Rolls ◽  
Thermoelastic Plastic

The paper is an investigation of strip curvature caused by the different speeds between the upper work roll and the lower work roll in the rolling process for an aluminum strip. At the same time, we analyzed the variations in the temperature field and strain field, and used a method of speeds variation of the upper and lower work rolls to calibrate the deformation curvature caused by the coolant condition in the hot rolling process. Based on the large deformation-large strain theory, and by means of the Updated Lagrangean Formulation (ULF) and increment theory, a coupled thermoelastic-plastic analysis model for hot rolling process is thus constructed. At the same time the finite difference method was also used to solve the transient heat transfer equation. Finally, the numerical analysis method developed in this study was employed to analyze the changes in the aluminum strip’s temperature and other changes during rolling. In addition, the average rolling force obtained from the simulation was compared with that from the experiments. It verified that the model in this study is reasonable.

Effect of Slab Quality on the Microstructure and Performance of Q345C Hot Rolling Strip Used for Pipe Pile Foundation

2012 ◽  
Vol 204-208 ◽  
pp. 1210-1214
Author(s):  
Hai He Luo ◽  
De Hui Zou ◽  
Zhi Fen Wang ◽  
Han Xiong Dong ◽  
Zhong Bo Dong
Keyword(s):  
Grain Size ◽  
Corrosion Resistance ◽  
Hot Rolling ◽  
Pile Foundation ◽  
Grain Structure ◽  
Pipe Pile ◽  
Corrosion Reaction ◽  
Rolling Strip ◽  
And Performance ◽  
Microstructure And Performance

The Effect of slab quality on the microstructure and performance of Q345C hot rolling strip for pipe pile foundation were studied by SEM, EBSD, mechanical test and corrosion test. The results showed that the dendrite size of the slab had a great impact on the grain size of the steel. The fine grain structure can significantly improve the mechanical properties of the steel, but to some extent, reduce its corrosion resistance. In the early and later stage of the corrosion reaction, the coarse grain structure can improve the corrosion resistance. However, in the middle stage of the corrosion reaction, the grain size had no significant effect on the corrosion resistance. The rust layer included the inner layer and the outer layer, in which the inner layer was relatively compact, and they were mainly composed of the oxide of iron.

Proportional Crown Rolling for Single Rough Stand in Semi-Continuous Hot Rolling Strip

2012 ◽  
Vol 602-604 ◽  
pp. 2050-2053
Author(s):  
Shen Bai Zheng ◽  
Sen Zhou ◽  
Hui Wang ◽  
Zhuo Fei Song ◽  
Hong Bin Li
Keyword(s):  
Hot Rolling ◽  
Hot Strip Rolling ◽  
Strip Rolling ◽  
Plate Rolling ◽  
Hot Strip ◽  
Rolling Strip ◽  
The Status ◽  
Rough Mill

According to the status of rolling middling stock without crown control on the single rough stand in semi-continuous hot strip rolling in domestic, the advantages and the working mode of middle plate rolling with proportional crown are introduced. Finally, the ways to improve the existing rough mill with CVC technology are discussed.

Experimental Study on Exit Edge Defects in Two Dimension Cutting of SiCp/Al Composites

2012 ◽  
Vol 723 ◽  
pp. 326-331
Author(s):  
De Jin Zou ◽  
Shu Tao Huang ◽  
Li Zhou ◽  
Li Fu Xu ◽  
Ning Hou ◽  
...  
Keyword(s):  
Cutting Speed ◽  
Rake Angle ◽  
Upward Trend ◽  
Cutting Depth ◽  
Edge Defect ◽  
Two Dimension ◽  
3D Microscopy ◽  
Edge Defects ◽  
Cutting Experiment ◽  
Exit Edge

In this paper, the influence of the tool rake angle, cutting depth and cutting speed on exit edge defect sizes are discussed by the two dimension cutting experiment of SiCp/Al composites. The sizes are measured by using the Keyence VHX-1000C type super preview 3D microscopy. The results indicate that exit edge defect sizes are influenced greatly by tool rake angle and cutting depth, and are influenced slightly by the cutting speed. The edge defect sizes have an overall downward trend when the tool rake angle is smaller than 5°, and have an apparent upward trend when the tool rake angle (γ0) is 10°.The length (L), height (H) of exit edge defects and the negative shear angle increase with increasing of the cutting depth.

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