Method for prolonging service life of six-roller reversing cold mill

Abstract

The invention discloses a method for prolonging service life of a six-roller reversing cold mill. In use, the continuous running mileage of a supporting roller is reduced, so that the continuous running mileage of the supporting roller is regulated from 5, 000KM in 10 days to 2500-3500KM within 5-7 days; the once grinding amount of the supporting roller is reduced, so that the once ground diameter of the supporting roller is regulated from 2mm to 0.7-1.2mm; a chamfer R of the side part of the supporting roller is reduced, so that the radius of the chamfer R of the side part of the supporting roller is changed from 40mm to 25-30mm; a working roller bearing is changed from an original needle bearing NA4924 to a double-row short cylinder bearing FC243390. The method for prolonging the service life of the six-roller reversing cold mill, which is disclosed by the invention, has the beneficial effects that, according to the description of the scheme, the structure is simple, the design is reasonable, the service life of the supporting roller is prolonged, the production quality is improved, and the service life of the working roller bearing is prolonged.

Description

technical field [0001] The invention relates to a method for using a cold rolling mill, in particular to a method for improving the service life of a six-roll reversing cold rolling mill. [0002] Background technique [0003] The six-high cold rolling mill is suitable for rolling wide band, fine strip and thin strip, and can be used for ordinary steel and stainless steel rolling. The production volume is large and the use is very extensive. The main components of the six-high cold rolling mill include work rolls and back-up rolls. The back-up rolls are important parts used to support the work rolls in the rolling mill so as to prevent the work rolls from being deflected and deformed during rolling and affecting the quality of the plate. They are in contact with the work rolls The surface of the support roll is affected by the rolling force, and contact fatigue stress is generated on the surface of the support roll, so that a fatigue hardened layer will be formed on the su...

AI Technical Summary

Problems solved by technology

In severe cases, even a large piece of peeling will appear on the edge of the support roll, resulting in the failure of the support roll to break the ring

Defects at the edge of support rolls often cause production accidents, which will seriously affect the rhythm of production and affect the output and quality of products

This phenomenon is called shoulder drop. For the edge defects of small pieces of meat, the use of the support roll can be recovered by increasing the amount of grinding, but for the defects of large pieces of peeling, it will directly lead to the scrapping of the support roll

The NA4924 needle roller bearings used at both ends of the work rolls require maintenance after 240 hours of continuous use, resulting in frequent maintenance