Welded flange hot-rolling technique

Abstract

The invention relates to a technique of flat welding flange hot rolls, which comprises the procedures of: putting a steel billet into a furnace and heating, then according to the thickness and width of flange blank, immediately rolling the hot billet intoto strip hot-rolled flat plate of which the cross-section approximates an isosceles trapezoid; then arc curling the plate toward the narrow side and making into spiral multi-layer circular steel rings of which the ends are connected successively; next cutting the connected rings into independent rings along the bus; and then flattening the rings and welding docking ports at above 700 DEG C, and making into flange blank. The invention overcomes the disadvantages of the prior flange manufacturing technique such as waste of raw materials, relatively low precision of flange blank and low production efficiency, thereby realizing mass production of multiple circular curling, speeding up production, improving quality, and greatly improving production efficiency. Besides, the technique which is easy to be operated, popularized and implemented, solves the problem existing in head and tail straight segment, raises utilization rate of the raw materials, and has good social and economic benefit.

Description

1. Technical field: [0001] The invention relates to a technology for making a steel billet into a flat-welded flange, in particular to a hot-rolling process for a flat-welded flange. 2. Background technology: [0002] With the rapid development of the economy, the pipeline transportation projects of various liquids and gases in my country are more and more widely used, and the connection of various pipelines is inseparable from flanges. The production of the flange is to finish the flange blank to make a precise flange. At present, the blank of the flange can be made of sheet metal, bar, forging, casting, etc., because casting has many defects, such as air holes, sand inclusions, etc., it is not suitable for flanges with high pressure and high strength. Therefore, the flat welding flange has become an indispensable supporting product. The flat welding flange is to make the flange blank first, and then finish the flange blank, so the processing cost depends on the accuracy ...

AI Technical Summary

Problems solved by technology

Although this invention is rolled into a flat welded flange to a certain extent to achieve the advantages of labor saving, time saving and raw material saving, the steel plate used must be pre-selected with a suitable thickness and length, and the thickness and length must be reserved. There is a lot of room for waste of raw materials, which also increases manufacturing costs and workload, and the production process of this patent can only realize the production of one flange blank at a time, and the efficiency is low

The Chinese invention patent "A Method for Making Flanges" with the publication number CN 1817556A describes in more detail the process of hot-rolling strip-shaped flat steel into a flange body, but the cross-section of the hot-rolled strip-shaped flat steel is It is rectangular, so that the thickness of the inner and outer diameters is not equal when it is crimped, which brings troubles to the next process and even the subsequent finishing process, and wastes raw materials; and in this patented method, the strip flat steel needs to be reheated to 700~900℃, thus further wasting fuel resources and increasing operating procedures

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