Renovation technique for phi2100í‡3400mm wrought steel support roll

A back-up roller and process technology, which is applied in the field of super-large back-up roll repair, can solve the problem that super-large back-up rollers have not been involved in the field of repair and regeneration, and achieve the effects of short repair time, prolonging service life and saving production costs.
CN101293300AInactive Publication Date: 2008-10-29SHANGHAI SHIWEI WELDING IND
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI SHIWEI WELDING IND
Publication Date
2008-10-29
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to the technical field for repairing an ultra-large type backup roll, in particular to a repair process of a forging steel backup roll with Phi2100* 3400mm. Firstly, welding is carried out on the rib of the backup roll: the roll body of the backup roll which needs to be welded is preheated to 250 DEG C, and the temperature is preserved for 10 hours; then the door of a furnace is opened, rib welding is carried out, zigzag welding is carried out every 100mm, and the length of the weld pass is 50-60mm; oxygen is used on the welded part immediately, and ethyne is used for warming the welded part until the welded part becomes blue. After the rib welding is finished, preheating treatment, temperature preservation treatment and destressing treatment are carried out respectively according to a heat treatment curve when the roll body of the backup roll is overlaid for making a bottom layer, a transition layer and a working layer. Compared with the prior art, in the technology of the invention, the influence on the service performance caused by the temperature circulation and change of a heat influencing region during the overlaying is considered, uniformity and penetration of preheating workpieces and uniformity of temperature between layers are guaranteed in the repair process, the blank in the repair rebirth field of the domestic ultra-large type backup roll is filled in. The time for repair is short, the service life is prolonged, and the cost is saved.
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Description

[technical field]

[0001] The invention relates to the technical field of repairing super-large backup rolls, in particular to a repairing process for φ2100×3400mm forged steel backup rolls. [Background technique]

[0002] The wear and corrosion caused by the operation of industrial machinery and equipment under different media conditions is of course a major issue that cannot be ignored in the world's industrial production. According to statistics, the loss caused by wear and corrosion of equipment and components in industrially developed countries is almost 7%-10% of the gross national product. The use of hard surface materials and hard surface technology can effectively prevent the wear and corrosion of equipment and components. , and the damaged components can be repaired and regenerated, which has significant economic and social benefits for building an economical economy.

[0003] Large-scale cold and hot continuous rolling mills have become the mainstream in my countr...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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