Study on the Formation Mechanism and Control of Untrimmed Aluminium Foil’s Surface Dirty Defect

2012 ◽  
Vol 485 ◽  
pp. 433-437
Author(s):  
Jing Zhong Gao ◽  
Shu De Zhou ◽  
Guo Liang Zhang ◽  
Xiang Hua Kong
Keyword(s):  
Quantitative Analysis ◽  
Cold Rolling ◽  
Formation Mechanism ◽  
Aluminum Foil ◽  
Rolling Process ◽  
Casting Rate ◽  
Aluminum Powders ◽  
Oil Film ◽  
Key Factor ◽  
And Control

The surface dirty defect of untrimmed aluminum foil was analyzed by SEM and EDS. The results show that the amount of the aluminum powders on the cold rolling sheet is too much, which caused the surface dirty defect. The quantitative analysis of dealumination demonstrated that the oil film strength of rolling process is the key factor to solving the dirty defect, the larger oil film strength, the smaller dealuminated quantity. When oil film strength is more than 290 N, dealuminated quantity will decrease. By increasing casting rate and improving oil film strength in sheet and strip process, the surface dirty defect on untrimmed surface is successfully eliminated.

scholarly journals Formation Mechanism and Influence Factors of Roll Surface Oil Film Thickness in the Double Cold Reduction Mill

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Cheng Qian ◽  
Zhenhua Bai ◽  
Jiasheng Zhang ◽  
Yaya Cui ◽  
Changchun Hua
Keyword(s):  
Cold Rolling ◽  
Film Thickness ◽  
Formation Mechanism ◽  
Rolling Process ◽  
Cold Reduction ◽  
Roll Surface ◽  
High Concentration ◽  
Oil Film ◽  
Reduction Mill ◽  
Roll Gap

In the double cold rolling process, the emulsion entering the roll gap during the double cold rolling process has the characteristics of high concentration and small flow rate so that the roll surface oil film thickness will affect roll gap oil film thickness, which in turn affects the rolling friction coefficient. This paper analyzes the formation mechanism and evolution process of the roll surface oil film thickness by considering the equipment and process characteristics of the emulsion direct injection application lubrication system. Then, based on the principle of fluid dynamics, the roll surface oil film thickness model in the double cold rolling process is established, and the prediction of the roll surface oil film thickness during the double cold rolling process is realized. Subsequently, the effects of five factors, such as rolling speed, work roll roughness, maximum contact stress between rolls, emulsion initial dynamic viscosity, and emulsion pressure viscosity coefficient, on the roll surface oil film thickness are quantitatively analyzed, and the corresponding influence laws are given. Finally, the relevant model and software that are applied to the 1220 double cold reduction mill have achieved good results.

Formation and Control of The Pinhole Defects on the Lightgauge Aluminum Foil

2013 ◽  
Vol 803 ◽  
pp. 496-501
Author(s):  
Shu Xin Zhou ◽  
Jian Zun Liu ◽  
Chuan Wei Zhang ◽  
Xiang Chen ◽  
Xiang Hua Kong
Keyword(s):  
Formation Mechanism ◽  
Aluminum Foil ◽  
Control Methods ◽  
And Control ◽  
Morphology Characteristics

Pinhole defects on light gauge aluminum foilwere classified by the morphology characteristics. According to the classification, the formation mechanism of pinhole defects was discussed and some control methods for the control of these pinholes were proposed. and the methods to prevent the pinhole were proposed.

Recent Development in Process Control for Aluminum Cold Rolling: Features of the Fata Hunter’s hSystem®

1999 ◽  
Author(s):  
Pier Michele Cattelino ◽  
Corrado Licata ◽  
Luigi Rèpaci
Keyword(s):  
Cold Rolling ◽  
Process Simulation ◽  
Rolling Process ◽  
Simulation Techniques ◽  
Adaptive Capabilities ◽  
Simulation And Control ◽  
Set Up ◽  
And Control ◽  
Fine Tune ◽  
Level 2

Abstract Aim of the present paper is to highlight Fata Hunter’s hSystem®, emphasizing its self adaptive capabilities, process simulation and control together with simulation techniques which allowed the system developers to set up and fine tune the whole automation package. In the framework of the implementation of the automation package, and especially of level 2, particular attention has been put upon cold rolling process modelization. To this aspect the second part of this paper has been dedicated.

scholarly journals Effect of Slab Reheating Temperature on Cold Rolling Texture Evolution of Nb-Containing Grain-Oriented Silicon Steel

Crystals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1478
Author(s):  
Liguang Wang ◽  
Shuhuan Wang ◽  
Jie Li ◽  
Jinyu Liang ◽  
Yunli Feng
Keyword(s):  
Cold Rolling ◽  
Texture Evolution ◽  
Cube Texture ◽  
Rolling Texture ◽  
Rolling Process ◽  
Silicon Steel ◽  
Single Stage ◽  
Two Stage ◽  
Goss Texture ◽  
Key Factor

Texture control of grain-oriented silicon steel is the key factor to ensure the magnetic properties of the finished product. Nb-containing grain-oriented silicon steel with different slab reheating temperatures was hot rolled followed by single-stage or two-stage cold rolling, and the textures were also analyzed. In the single-stage cold rolling process, as the slab reheating temperature is reduced, the intensity of the rotating cube texture {100}<011> and Goss texture {011}<100> drops, and that of the {111}<112> texture increases. In the two-stage cold rolling process, with the decrease in the slab reheating temperature, the intensity of the {111}<112> texture increases from 4.958 to 6.809. At the same slab reheating temperature, the intensity of the rotating cube texture declines more significantly in the two-stage cold rolling process. Finally, two-stage cold rolling with the slab reheating temperature of 1220 °C is found to be more beneficial for the formation of a sharp Goss texture during the second recrystallization. The magnetic induction intensity B800 of the final product is 1.87T, and the iron loss P1.7/50 is 1.36 W/kg.

ACCESS TO AND CONTROL OVER LAND AS GENDERED: CONTEXTUALIZING WOMEN’S ACCESS AND OWNERSHIP RIGHTS OF LAND IN RURAL GHANA

2016 ◽  
Vol 45 (2) ◽  
pp. 28-48 ◽  
Author(s):  
Isaac Dery
Keyword(s):  
Thematic Analysis ◽  
Rural Women ◽  
Rural Poor ◽  
Rural Ghana ◽  
Secure Access ◽  
Key Factor ◽  
Access Rights ◽  
Ownership Rights ◽  
And Control ◽  
Relationship Of

Women’s access to and control over productive resources, including land, has increasingly been recognized in global discussions as a key factor in reducing poverty, ensuring food security and promoting gender equality. Indeed, this argument has been widely accepted by both feminists and development theorists since the 1980s. Based on qualitative research with 50 purposively selected men and women, this study explored the complexity of women’s access to and control over land within a specific relationship of contestations, negotiations, and manipulations with men. Data were analyzed using thematic analysis. While theoretically, participants showed that women’s [secure] access to and control over land has beneficial consequences to women themselves, households and the community at large, in principle, women's access and control status was premised in the traditional framework which largely deprives women, equal access and/or control over the land. The study indicates that even though land is the most revered resource and indeed, the dominant source of income for the rural poor, especially women, gender-erected discrimination and exclusion lie at the heart of many rural women in gaining access to land. This study argues that women's weak access rights and control over land continue to perpetuate the feminization of gender inequality–while men were reported to possess primary access and control over land as the heads of households, women were argued to have secondary rights due to their ‘stranger statuses’ in their husbands’ families. Overall, the degree of access to land among women was reported to be situated within two broad contexts–marriage and inheritance.

Application of EDS Technique for OSP Film Thickness Measurement

2006 ◽  
Author(s):  
Prong Kongsubto ◽  
Sirarat Kongwudthiti
Keyword(s):  
Thin Film ◽  
Quantitative Analysis ◽  
Joint Strength ◽  
Critical Factor ◽  
Thickness Measurement ◽  
Ic Manufacturing ◽  
And Control ◽  
Film Thickness Measurement ◽  
Non Destructive

Abstract Organic solderability preservatives (OSPs) pad is one of the pad finishing technologies where Cu pad is coated with a thin film of an organic material to protect Cu from oxidation during storage and many processes in IC manufacturing. Thickness of OSP film is a critical factor that we have to consider and control in order to achieve desirable joint strength. Until now, no non-destructive technique has been proposed to measure OSP thickness on substrate. This paper reports about the development of EDS technique for estimating OSP thickness, starting with determination of the EDS parameter followed by establishing the correlation between C/Cu ratio and OSP thickness and, finally, evaluating the accuracy of the EDS technique for OSP thickness measurement. EDS quantitative analysis was proved that it can be utilized for OSP thickness estimation.

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