Method for manufacturing bent roller by using overlaying repair technology

Abstract

The invention relates to a method for manufacturing bending rollers using the surfacing welding repair technology, and belongs to the technical field of surfacing welding. The invention provides a surfacing welding method which does not stick to steel on the roll surface after surfacing welding and has a long service life. The method of the present invention includes selecting suitable welding materials and adjusting process parameters to carry out surfacing work. The welding materials are nickel-chromium-aluminum-type nickel-based alloy flux-cored welding wire and matching flux. The weight ratio of the deposited chemical components after surfacing is: Cr: Al: Ni = 6-8: 6-8: 80-86; the surfacing work includes the following steps: roll center pretreatment → flaw detection inspection → adjustment of process parameters and surfacing → machining → finished product inspection. Using the method of the present invention to carry out surfacing welding repair and making bending rolls does not require preheating before welding, no surfacing transition layer, no heat preservation between layers, saving surfacing welding steps, and at the same time, surfacing welding time is short and the amount of welding materials used is small. Meet the requirements of low-carbon environmental protection.

Description

technical field [0001] The invention relates to a method for manufacturing bending rollers by using surfacing welding repair technology, which belongs to the field of welding technology. Background technique [0002] The hot coil box for hot continuous rolling is installed between the rough rolling end stand and the finishing rolling flying shear. Its job is to coil the intermediate billet after the last steel throwing at high speed and centerlessly into a steel coil, and then reversely uncoil it. At the same time, the intermediate billet is sent to the finishing rolling mill for rolling. In the production process, in order to speed up the production rhythm, the hot coil box generally adopts a double-station working method: when the first frame of the finish rolling is bitten, the steel coil at the coiling station is transferred to the uncoiling station to continue the uncoiling work, so that the coiling station Continue to prepare for the coiling of the next intermediate b...

AI Technical Summary

Problems solved by technology

Due to the special working conditions, the service life of bending rolls is short, usually less than 3 months in Panzhihua Iron and Steel Co. Ultimately affects the manufacturing cost of steel

In order to meet the temperature requirements of the surfacing process, methods such as electric heating and gas heating are generally adopted, which makes the working environment of the surfacing operators extremely poor, and is not conducive to the surfacing repair and the stability of the quality of the bending roll