CN101758359A

CN101758359A - Backup roll reparation technique

Info

Publication number: CN101758359A
Application number: CN200810201138A
Authority: CN
Inventors: 赵良才
Original assignee: Shanghai Hexin Metal Products Co Ltd
Current assignee: Shanghai Hexin Metal Products Co Ltd
Priority date: 2008-10-14
Filing date: 2008-10-14
Publication date: 2010-06-30

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

A kind of backup roll reparation technique

[technical field]

The present invention relates to roller renovation technique technical field, specifically a kind of backup roll reparation technique.

[background technology]

Backing roll is very high for the uniformity requirement of case hardness; with the surface quality of assurance steel plate, and the as-cast structure crystal grain of deposited metal is thicker, and hardness is inhomogeneous; be difficult to guarantee the uniformity of hardness generally speaking; secondly the carbon equivalent of bearing steel is too high, and extremely difficult built-up welding is though take the possible built-up welding success of various safeguard measures (built-up welding transition zone, preheating etc.); but the built-up welding operation is tired many; will anneal before the weldering, postwelding is wanted to quench behind the high tempering again, has increased many costs.

[summary of the invention]

The objective of the invention is to overcome the deficiencies in the prior art, a kind of backup roll reparation technique is provided.

Processing step is: a. is rough turn, and φ 500 roll cars are to φ 530, and φ 450 roll cars are removed greasy dirt to φ 430mm; B. preheating, 4 rolls are together packed in the bench vehicle type electrical resistance furnace, are warmed up to 350 ℃ with 120 ℃ of speed per hour, be incubated and come out of the stove after 8 hours, one one built-up welding, the roll that welds is sent in the stove immediately, furnace temperature remain on the built-up welding transition zone time be 350 ℃, when the built-up welding hardstanding, be 380-400 ℃; C. built-up welding transition zone, the roll that is preheating to 350 ℃ is with 306 welding wires+HJ431 solder flux built-up welding transition zone of φ 3.2mm, and 200-250 ℃ of baking 2 hours, welding wire can be around going into wire reel after wanting degreasing and rust removal before solder flux used; D. built-up welding hardstanding after last roll has welded transition zone and packs in the stove, is raised to 380 ℃-400 ℃ with furnace temperature, be incubated 2 hours, utilize this time to perform welding wire, solder flux more changes jobs, solder flux will toast equally, welding wire is wanted degreasing and rust removal, uses 324 welding wires+HJ107 solder flux of φ 3.2mm; E. tempering; F. half finish turning is to staying the mill amount; G. grinding; H. tempering for the second time.

The present invention compared with prior art, processing step is simple, can guarantee the uniformity of roller hardness, and cut down finished cost.

[specific embodiment]

Illustrate in greater detail the present invention below by embodiment.

Processing step: a. is rough turn, and φ 500 roll cars are to φ 530, and φ 450 roll cars are removed greasy dirt to φ 430mm; B. preheating, 4 rolls are together packed in the bench vehicle type electrical resistance furnace, are warmed up to 350 ℃ with 120 ℃ of speed per hour, be incubated and come out of the stove after 8 hours, one one built-up welding, the roll that welds is sent in the stove immediately, furnace temperature remain on the built-up welding transition zone time be 350 ℃, when the built-up welding hardstanding, be 380-400 ℃; C. built-up welding transition zone, the roll that is preheating to 350 ℃ is with 306 welding wires+HJ431 solder flux built-up welding transition zone of φ 3.2mm, and 200-250 ℃ of baking 2 hours, welding wire can be around going into wire reel after wanting degreasing and rust removal before solder flux used; D. built-up welding hardstanding after last roll has welded transition zone and packs in the stove, is raised to 380 ℃-400 ℃ with furnace temperature, be incubated 2 hours, utilize this time to perform welding wire, solder flux more changes jobs, solder flux will toast equally, welding wire is wanted degreasing and rust removal, uses 324 welding wires+HJ107 solder flux of φ 3.2mm; E. tempering; F. half finish turning is to staying the mill amount; G. grinding; H. tempering for the second time.

Claims

1. backup roll reparation technique, it is characterized in that described processing step: a. is rough turn, and φ 500 roll cars are to φ 530, and φ 450 roll cars are removed greasy dirt to φ 430mm; B. preheating, 4 rolls are together packed in the bench vehicle type electrical resistance furnace, are warmed up to 350 ℃ with 120 ℃ of speed per hour, be incubated and come out of the stove after 8 hours, one one built-up welding, the roll that welds is sent in the stove immediately, furnace temperature remain on the built-up welding transition zone time be 350 ℃, when the built-up welding hardstanding, be 380-400 ℃; C. built-up welding transition zone, the roll that is preheating to 350 ℃ is with 306 welding wires+HJ431 solder flux built-up welding transition zone of φ 3.2mm, and 200-250 ℃ of baking 2 hours, welding wire can be around going into wire reel after wanting degreasing and rust removal before solder flux used; D. built-up welding hardstanding after last roll has welded transition zone and packs in the stove, is raised to 380 ℃-400 ℃ with furnace temperature, be incubated 2 hours, utilize this time to perform welding wire, solder flux more changes jobs, solder flux will toast equally, welding wire is wanted degreasing and rust removal, uses 324 welding wires+HJ107 solder flux of φ 3.2mm; E. tempering; F. half finish turning is to staying the mill amount; G. grinding; H. tempering for the second time.