Backup roll reparation technique

Abstract

The invention relates to the technical field of roll reparation techniques, in particular to a backup roll reparation technique. The backup roll reparation technique includes the following steps: (a) rough turning: rolls with the diameter of 500mm are turned to the diameter of 530mm, rolls with the diameter of 450mm are turned to the diameter of 430mm, and oil stains are cleaned up; (b) preheating; (c) intermediate layer surfacing; (d) hard surface layer surfacing: when the last roll is surfaced with an intermediate layer and mounted into a furnace, the furnace temperature is increased to 380 DEG C to 400 DEG C, and is kept for 2 hours, meanwhile, a welding wire and flux are replaced, the flux is also baked, the welding wire is deoiled and derusted, and a 324 welding wire with the diameter of 3.2mm and HJ107 flux are used; (e) tempering; (f) semi-finishing turning to the grinding allowance; (g) grinding; (h) secondary tempering. Compared with the prior art, the invention has the following advantages that: the technique steps are simple, the uniformity of rigidity of rolls can be ensured, and moreover, the machining cost is reduced.

Description

[technical field] [0001] The invention relates to the technical field of roller repairing technology, in particular to a backup roller repairing technology. [Background technique] [0002] Back-up rollers have very high requirements on the uniformity of surface hardness in order to ensure the surface quality of the steel plate. However, the as-cast structure of the surfacing metal has coarse grains and uneven hardness. Generally, it is difficult to ensure the uniformity of hardness. Secondly, the bearing steel The carbon equivalent is too high, and it is extremely difficult to surfacing. Although it is possible to successfully surfacing by taking various protective measures (surfacing transition layer, preheating, etc.), the surfacing process is cumbersome, and it needs to be annealed before welding and high temperature tempering after welding. After quenching, a lot of costs have been increased. [Content of the invention] [0003] The purpose of the present invention is ...

AI Technical Summary

Problems solved by technology

[0002] Back-up rollers have very high requirements on the uniformity of surface hardness in order to ensure the surface quality of the steel plate. However, the as-cast structure of the surfacing metal has coarse grains and uneven hardness. Generally, it is difficult to ensure the uniformity of hardness. Secondly, the bearing steel The carbon equivalent is too high, and it is extremely difficult to surfacing. Although it is possible to successfully surfacing by taking various protective measures (surfacing transition layer, preheating, etc.), the surfacing process is cumbersome, and it needs to be annealed before welding and high temperature tempering after welding. After quenching, a lot of cost is increased