scholarly journals Numerical Treatments of Slipping/No-Slip Zones in Cold Rolling of Thin Sheets with Heavy Roll Deformation

Lubricants ◽  
2015 ◽  
Vol 3 (2) ◽  
pp. 113-131 ◽  
Author(s):  
Yukio Shigaki ◽  
Rebecca Nakhoul ◽  
Pierre Montmitonnet
Keyword(s):  
Cold Rolling ◽  
Thin Sheets ◽  
Roll Deformation ◽  
Numerical Treatments

Development of Mixed Lubrication Cold Rolling Model

2015 ◽  
Vol 642 ◽  
pp. 190-195
Author(s):  
Yhu Jen Hwu ◽  
Jian Ting Lee ◽  
Yeau Ren Jeng
Keyword(s):  
Cold Rolling ◽  
High Surface ◽  
Work Roll ◽  
Mixed Lubrication ◽  
Rolled Strip ◽  
Base Oil ◽  
Roll Deformation ◽  
Inlet Zone ◽  
Quality Surface ◽  
Roll Bite

Within past 20 years, high surface qualities of cold strip were demanded by automotive industry and electrical engineering. Main purposes of cold rolling processed are to provide high quality surface and generate appropriate roughness for different customs. Emulsion is a common coolant used in cold rolling processes, Properties of base oil in emulsion, concentration, roughness of work roll, rolling speed and reduction are important parameters, which dominate the surface qualities of cold rolled strip. Hence, a powerful cold rolling model which can describe complicate tribological behavior in roll bite is required. In this article, a cold rolling model which integrates roll deformation and mixed lubrication in inlet zone and biting area was developed. The thickness of oil film, fraction of contact area and coefficient of friction in roll bite are calculated.

Characteristics of Powder-Rolled and Sintered Sheets Made from HDH Ti Powders

2012 ◽  
Vol 520 ◽  
pp. 281-288 ◽  
Author(s):  
Nho Kwang Park ◽  
C.H. Lee ◽  
Jeoung Han Kim ◽  
Jae Keun Hong
Keyword(s):  
Cold Rolling ◽  
Relative Density ◽  
Tensile Properties ◽  
Process Parameters ◽  
Annealing Treatment ◽  
Powder Rolling ◽  
Powder Size ◽  
Thin Sheets ◽  
Roll Speed ◽  
Roll Gap

In this study, direct powder rolling was applied to make thin sheets from HDH (hydrogenation and dehydrogenation) powders. Effects of materials and process parameters on tensile properties of sintered sheets are investigated. In the direct powder rolling with two-horizontal counter-rotating rollers, materials parameters including powder size and process parameters such as roll gap, roll speed, and packing height are controlled. With -100mesh Ti powders, CP titanium sheets of a thickness up to 1.5mm and a width up to 300mm were obtained without any rolling defects. Sintering of the rolled strips was performed between 1000°C and 1250°C at 50°C intervals for 1hour to 4 hours. The relative density of the sintered strips was found to be around 85 to 90 percent. After sintering, the complete densification was made by cold rolling, and microstructures and tensile properties were evaluated after annealing treatment at 750°C for 2 hours.

scholarly journals Study of energy consumption for cold rolling of thin sheets

2021 ◽  
pp. 56-61
Author(s):  
V.A. Chubenko ◽  
Т.P. Yarosh ◽  
А.A. Khinotska ◽  
◽  
◽  
...  
Keyword(s):  
Energy Consumption ◽  
Cold Rolling ◽  
Thin Sheets

scholarly journals Analysis of the Effect of Ultrasonic Welding on Microstructure

2018 ◽  
Vol 1 (1) ◽  
pp. 49-52
Author(s):  
Tünde Kovács ◽  
Péter Pinke
Keyword(s):  
Mechanical Properties ◽  
Cold Rolling ◽  
Welding Process ◽  
Ultrasonic Welding ◽  
Grain Structure ◽  
Welding Parameters ◽  
Recrystallization Process ◽  
Thin Sheets ◽  
Metal Sheets ◽  
Joining Process

Abstract Ultrasonic welding is very useful for joining thin metal sheets [1, 2]. The effect of ultrasound on microstructure is currently not well understood because the changes produced depend very much on the welding parameters and the properties of the metal being considered. Thin sheets formed by cold rolling acquire a special grain structure. During the welding process the heat produced causes recrystallization; even where heat is not applied in the joining process the recrystallization process alters the mechanical properties within the heat affected zone (HAZ). The mechanical properties of the welded samples depend on the microstructure. In this work we analyse the ultrasonic welding effect on the joint and the HAZ [3, 4].

A Comparison of Cold Rolling Theories Based on the Equilibrium Approach

1980 ◽  
Vol 102 (2) ◽  
pp. 223-228 ◽  
Author(s):  
Usamah Saeed ◽  
J. G. Lenard
Keyword(s):  
Cold Rolling ◽  
Numerical Technique ◽  
Roll Force ◽  
Roll Torque ◽  
Equilibrium Approach ◽  
Roll Deformation ◽  
Roll Separating Force ◽  
Frictional Coefficients ◽  
Better Than

Roll separating force and roll torque are studied in cold rolling of steel and aluminum strips. In the analysis roll deformation is accounted for by a numerical technique; in the experimental portion force and torque transducers are used to monitor the variables. It is concluded that in spite of using average constant frictional coefficients, the technique of Atreya and Lenard predicts roll force and torque somewhat better than Orowan’s approach.

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