Long log direct-rolling casting blank thermal insulation device, production line and method

Abstract

The invention discloses a long log direct-rolling casting blank thermal insulation device, a production line and a method and belongs to the technical field of steel metallurgical industrial long logdirect rolling. The casting blank thermal insulation device comprises a steel pushing mechanism, a cantilever roller bed, an electric heating device and a stepping beam structure which are arranged ona box, and the stepping beam structure comprises a movable beam and a fixed beam. The casting blank thermal insulation production line comprises a steel furnace, a continuous casting machine, a withdrawal and straightening machine, a dividing shear, a parallel flow roller bed, the casting blank thermal insulation device, an electromagnetic induction heat supplementing device and a rolling line. According to the production line, by arranging the casting blank thermal insulation device behind the continuous casting parallel flow roller bed, when a continuous casting blank cannot be produced dueto a short-time fault of the rolling line, the continuous casting blank enters the casting blank thermal insulation device for thermal insulation, and after the fault is handled, the continuous casting blank in the casting blank thermal insulation device discharges steel through the stepping beam structure in the casting blank thermal insulation device and is rolled after heat supplementing by electric induction. In the whole production process, except for a small quantity of head and tail blanks, no continuous casting blank gets off, and therefore the direct rolling rate and yield of the long log direct-rolling production line are increased.

Description

technical field [0001] The invention belongs to the technical field of direct rolling of long products in the iron and steel metallurgical industry, and in particular relates to a thermal insulation device, production line and method for direct rolling of long products. Background technique [0002] As one of the important products in the steel industry, wire rods are widely used. At present, the production method of bar and wire mainly adopts multi-strand continuous casting machine to produce billet or round billet, cuts the billet and sends it to the heating furnace through the hot delivery roller table, and the heating furnace heats the billet and sends it to the rolling mill for rolling system. The specific process flow is as follows: continuous casting machine→drawing and leveling machine→cutting machine→conveyor roller table→steel shifting machine→steel separator→hot feeding roller table→heating furnace bench→heating furnace→rough rolling unit→intermediate rolling uni...

AI Technical Summary

Problems solved by technology

There are many problems and deficiencies in this production method: 1) The production process is long and the temperature loss is high; 2) If it is directly hot-fed, the temperature at the entrance of the rolling mill will be too low, resulting in a substantial increase in the power of the rolling mill

However, it cannot solve the problem of continuous casting slab waste caused by waiting when failures occur in the continuous casting process and steel rolling process

Invention patent "A device for producing steel bars by rolling billets without heating at low temperature and its production method" (CN103480647A) Although the heating furnace is canceled, the device adopts multiple rows of continuous casting slabs in parallel, and then divides the steel by a horizontal allocation device The method of single feeding into the hot-feeding roller table will cause the continuous casting slab to enter the hot-feeding roller table for a long time and the temperature drop will be too large, and the cooling time of the continuous casting slab will be increased due to the need to move the steel horizontally , it can be seen that there is no essential difference between this device and the currently commonly used hot-feeding and hot-charging technology. The temperature drop of the continuous casting slab is too large to meet the rolling requirements of the rolling mill, so it is not feasible.

The invention patent "Continuous Casting-Direct Rolling Device and Method for Producing Rods, Wires and Profiles" (CN104550237A) proposes a continuous casting and rolling method for profiled rods and wires. The insulation cover is used for heat preservation, and the surface temperature of the casting slab in the roughing rolling mill will drop to about 900°C, and the core temperature will only be 950°C, which cannot meet the rolling requirements of high-quality special steel. The rolling rate is not high, resulting in low output of the production line

[0004] Aiming at the endless continuous casting and rolling technology, the invention patent "Continuous casting and rolling method for producing profile rods and wires by using the waste heat of molten steel" (CN102310078A) proposes a continuous casting and rolling method for producing profile bars and wires by using the waste heat of molten steel to realize the production of profile bars and wires However, due to the limitation of the current continuous casting level, the output of a single production line is not high, and when multi-strand production is used, there are too many rolling mills and the investment is too large

Based on its high-speed continuous casting technology, Danieli adopts the MIDA solution to realize continuous casting and rolling. However, they are all put into operation at present, and the output of a single production line is low, and the cost performance of investment and operation is not high. Therefore, it is necessary to design a direct rolling of long products. production line to overcome the above problems

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