Segmental variable interference combined cold rolling back-up roll

Abstract

The invention relates to the technical field of rolling mills, and discloses a segmented type variable interference magnitude combined type cold rolling support roll. The segmented type variable interference magnitude combined type cold rolling support roll comprises a roll core and a roll sleeve, and the roll core and the roll sleeve form a combined roll; the roll sleeve is in interference fit with a body part of the roll core, the roller sleeve is of a hollow cylindrical structure, and the roller core comprises the body part and connecting parts located on both sides of the body part; variable interference magnitude is adopted in the body part of the roll core for segmented machining, each segment adopts the preset dimensional tolerance and surface roughness of each segment, the frictioncoefficient is changed by changing the surface roughness, and the axial distribution of friction force on a whole interference fit surface tending to be uniform is realized; meanwhile, each segment has the preset dimensional accuracy of each segment, and the tolerance of the right part and the left part are symmetrical; and the interference fit magnitude decreases gradually from the middle to theedge, and the contact stress at the edge is smaller than the contact stress in the middle.

Description

technical field [0001] The invention relates to the technical field of rolling mill equipment, in particular to a segmented variable interference margin combined cold rolling backup roll. Background technique [0002] Backup rolls are rolls used to support the work rolls and intermediate rolls. At present, domestic cold-rolled back-up rolls are generally manufactured by integral casting or integral forging. Quality defects such as surface peeling of the back-up roll caused by fatigue crack growth will lead to the scrapping of the entire back-up roll, resulting in high roll consumption and great waste of roll materials. However, the inner side of the roll sleeve of the combined back-up roll of the cold tandem rolling mill does not need to be processed with key grooves or internal threads. The roll core and roll sleeve are processed together through thermal interference fit, and the thermal assembly stress generated by thermal assembly ensures that the roll sleeve and roll cor...

AI Technical Summary

Problems solved by technology

However, the combined back-up roll requires high stress for assembly. During the cold rolling process, the contact stress of the interference fit surface of the roll sleeve and the roll core is uneven and non-linear along the axial and radial directions. In addition, the interference fit surface frets The axial and radial distribution of slip is not uniform, and the axial and radial fretting wear of the entire interference fit surface is uneven. Generally, the axial outer wear of the interference fit surface is more serious than the inner wear, so the interference fit surface There is a big difference in the fretting fatigue life between the edge and the middle

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