Mill Professional Manufacturers Tell About The Cause Of The Roll In The Fracture

- Jul 24, 2018 -

Mill professional manufacturers introduced, in practical applications, rolling mill rolls may appear broken. According to the fracture phenomenon, the main parts of the fracture are mainly concentrated in the roll ring, and the fracture section is irregular inclined or vertical section.

So why is this happening? In order to analyze this problem, it can be explained from many aspects. Mill professional manufacturers that, first of all, may be due to the quality of the roll itself, because the work roll and high temperature slab direct contact, and bear a variety of loads, and thus require good heat resistance.

If the hardness of roll body decreases with the increase of the roll temperature, it means that the heat resistance of the roll is poor, which will seriously affect the overall performance of the roll. At the same time set rolling conditions to analyze, the roll of this component must also have good wear resistance and the appropriate hardness and strength.

Mill professional manufacturers explained that, in fact, the roller cycle bearing the surface layer of mechanical fatigue, roll surface through the rolling parts of the cycle of heating and cooling water cycle of the thermal fatigue, will cause roller wear and thermal cracks appear. Mill professional manufacturers said that at the same time the hardness of the standard is also very important, in general, its hardness and roll body of the resistance to thermal cracking inversely proportional. In other words, the higher the hardness of the roll body, the better the wear resistance, but the more fragile the resistance to thermal cracking.

Generally speaking, the wear resistance of rollers and the hardness of roll surface is related to the hardness difference along the diameter direction, so it is hoped that the hardness difference along the diameter of the roll is as small as possible, and the hardness is moderate. Finally, in the actual rolling work, the roll will also bear a lot of load. Mill professional manufacturers believe that, for example, in the rolling process, the roll will be from the hydraulic device added at both ends of the rolling pressure, the deformation of the workpiece produced by the reaction, but also under the hot and cold effect of the alternating load.