Method for endless rolling of sectional material and rod and wire materials

Abstract

The invention discloses a method for endless rolling of sectional material and rod and wire material and a flexible connecting device thereof, which realize seamless connection of all-line rolling and continuous molding from crystallizers to finished products. The invention comprises that a flexible connecting rolling mill device is arranged on a conventional continuous casting-continuous rollingproduction line, wherein the flexible connecting rolling mill device is in three forms: one consists of a soft pressure lower roll system; one consists of a high pressure lower roll mechanism; and one consists of the soft pressure lower roll system and the high pressure lower roll mechanism together. The flexible connecting rolling mill device is arranged between the crystallizers and the conventional continuous rolling mills in one of the three forms. The method for the endless rolling of the sectional material and rod and wire materials and the flexible connecting device thereof save three processes of continuously cast bloom cutting, secondary heating and welding, realize the seamless connection and flexible connection between the continuous casting and continuous rolling, shorten the production flow and the production line length, simplify the operation, and provide a new way for the metallurgy production to realize the energy and resource conservation, reduce the carbon emission,reduce the cost and improve the product quality and competitiveness.

Description

technical field [0001] The invention relates to a metal pressure forming method, in particular to a method for endless rolling of profiles, rods and wires. Background technique [0002] The existing technological process of hot-rolled profiles, rods and wires rolling is: billet continuous casting → cutting → secondary heating → segmental continuous rolling → finished product segmental shearing or coiling → cooling → finishing packaging → storage. In this process, because the casting speed of the continuous casting machine is lower than the minimum input speed of the rolling mill, the casting slab must be cut into sections, and the temperature of the sectioned slab has dropped below the rolling temperature value. Therefore, the billet cut into sections must be sent into the heating furnace, and reheated to the required rolling temperature before being sent into the rolling mill for segmental rolling. Since the slab is cut by flame, the slab at the incision is burnt into iron...

AI Technical Summary

Problems solved by technology

And when the slab is rolling, in order to prevent accidents caused by the "split head" of the head, each section of the slab must be cut 2-4 times, the cutting loss rate per ton is 0.5-1%, and each pass bites There may be hidden dangers of accidents at any time, and it will cause impact load to the rolling mill, waste electric energy, and cause severe wear or even damage to the roll.

[0003] It can be seen from the above that there are two main problems in the existing process: one is that after the continuous casting slab is cut, the head and tail of the rolled piece are prone to process failure and dimensional accuracy drop during the rolling process, which affects the yield and product quality; the other is reheating Consumes a lot of energy, causes a lot of oxidation loss, and emits a lot of smoke and carbon dioxide

Although this solves the problem caused by multiple bites in the rolling process, it still needs to cut off the slab and reheat it again, and does not realize the direct endless rolling of the slab, and this method has high energy consumption and low efficiency. , complex equipment, high cost, welding quality and production stability, etc., have not been popularized and applied

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