Automatic Ultrasonic Flow Detector for Roll Surface Cracks (KARCS)

1988 ◽  
Vol 28 (6) ◽  
pp. 515-515
Keyword(s):  
Surface Cracks ◽  
Roll Surface ◽  
Flow Detector

Reduction of Surface Cracks at Al-Mg Alloy Strip Surface Cast by Unequal Diameter Twin Roll Caster

2020 ◽  
Vol 1007 ◽  
pp. 6-11
Author(s):  
Toshio Haga ◽  
Kazuki Yamazaki ◽  
Hisaki Watari ◽  
Shinichi Nishida
Keyword(s):  
Grain Size ◽  
Molten Metal ◽  
Previous Method ◽  
Mg Alloy ◽  
Surface Cracks ◽  
Roll Surface ◽  
Strip Surface ◽  
Twin Roll Caster ◽  
Heat Transfers ◽  
Twin Roll

Al-Mg alloy strips were cast by an unequal-diameter twin-roll caster. It was found that cracks formed on the surface at grain boundaries. The grains near the surface were small in size, which likely contributed to crack formation. The use of a molten metal pouring method to increase the grain size near the surface is proposed to reduce cracks. In the previous method, molten metal is poured into a pool, which is on the lower roll surrounded by side-dam plates, a back-dam plate, and the upper roll. In this study, molten metal was directly poured onto the roll surface at a shallow angle using a launder. When the angle was smaller than 20°, cracks did not form. With the proposed method, the heat transfers between the molten metal and the roll surface decreased, as determined from the grain size and strip thickness. The cracks on the strip surface were color-checked and visually inspected.

Study on Casting Roll during Twin-Roll Casting of Thin Strip

2010 ◽  
Vol 654-656 ◽  
pp. 1602-1605 ◽  
Author(s):  
Xiao Ming Zhang ◽  
Zheng Yi Jiang ◽  
Dong Bin Wei ◽  
Xiang Hua Liu ◽  
Guo Dong Wang
Keyword(s):  
Thermal Deformation ◽  
Processing Parameters ◽  
Strip Casting ◽  
Thin Strip ◽  
Surface Cracks ◽  
Temperature Model ◽  
Roll Surface ◽  
Strip Shape ◽  
Roll Casting ◽  
Twin Roll

In twin-roll thin strip casting, the temperature of casting roll affects the roll thermal stress, and influences the thermal deformation, the generation of roll surface cracks, the strip shape and the service life of casting roll. In this paper, the features of the casting roll materials have been analysed, the effects of the clad materials and thickness on temperature field of the casting roll have been simulated and discussed. The developed temperature model of casting roll is helpful in optimising processing parameters and the design of casting roll during twin-roll thin strip casting.

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