Backup roll reparation technique

A backup roller and process technology, applied in the field of backup roller repair technology, can solve the problems of increased cost, high carbon equivalent of bearing steel, difficult surfacing welding, etc., and achieve the effects of reducing processing costs, simple process steps, and ensuring uniformity

Inactive Publication Date: 2010-06-30
SHANGHAI HEXIN METAL PRODS
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  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Embodiment Construction

[0006] The present invention will be described in more detail below by way of examples.

[0007] Process steps: a. Rough turning, φ500 rolls are turned to φ530, φ450 rolls are turned to φ430mm, and oil stains are removed; b. Preheating, 4 rolls are loaded into a trolley-type resistance furnace together, and the temperature is raised to 350 at a rate of 120 ° C per hour. ℃, keep warm for 8 hours and come out of the furnace, surfacing one by one, and the welded rolls are immediately sent into the furnace. 400°C; c. Overlay welding transition layer, roll preheated to 350°C, use φ3.2mm 306 welding wire + HJ431 flux to overlay the transition layer, bake the flux at 200-250°C for 2 hours before using, and degrease the welding wire After the rust, it can be wound into the welding wire reel; d. Surfacing hard surface layer, when the last roll has welded the transition layer and put it into the furnace, raise the temperature of the furnace to 380°C-400°C and keep it warm for 2 hours. ...

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P6/00
Inventor 赵良才
Owner SHANGHAI HEXIN METAL PRODS
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