Short-process long material endless rolling production line and short-process long material endless rolling method

Abstract

The invention belongs to the technical field of the ferrous metallurgy industry, and relates to a short-process long material endless rolling production line and a short-process long material endlessrolling method. The short-process long material endless rolling production line comprises a steel making furnace, a continuous casting machine, a withdrawal and straightening machine, a rough rollingproduction line, an intermediate rolling production line, a finish rolling production line, a reducing and sizing mill production line and a cooling table. The steel making furnace, the continuous casting machine, the withdrawal and straightening machine, the rough rolling production line, the intermediate rolling production line, the finish rolling production line, the reducing and sizing mill production line and the cooling table are closely connected in sequence. The rough rolling production line comprises a rough rolling unit, an accident shear and cooling table, a heat preservation deviceand a pair of first end cutting flying shears in sequence. The heat preservation device supplements the heat for a casting blank which is subjected to rough rolling operation, and the separation distance between an inlet of the withdrawal and straightening machine and an inlet of the rough rolling unit ranges from 9m to 30m. The intermediate rolling production line comprises an intermediate rolling unit, a water cooling tank and a pair of second end cutting flying shears in sequence. The finish rolling production line comprises a finish rolling unit, a water cooling tank and a pair of third end cutting flying shears in sequence. The reducing and sizing mill production line comprises a reducing and sizing mill unit, a water cooling tank and a pair of fixed-length flying shears in sequence.By the adoption of the short-process long material endless rolling production line, the technological arrangement is simple, the separation distance between the continuous casting machine and the rough rolling unit is small, the rough rolling gripping operation is facilitated, the relative power consumption of the heat preservation or supplement which is conducted after the rough rolling operation is accomplished is low, the cost is low, the industrial production is easily achieved, and the short-process long material endless rolling production line has the obvious economic benefit.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy industry, and relates to a short-process long material endless rolling production line and a rolling method thereof. Background technique [0002] As one of the important products in the steel industry, wire rods are widely used in construction, machinery and metal products industries. At present, the conventional production method of wire and rod is to use multi-strand continuous casting machine to produce billet or round billet, cut the cast billet and send it to the heating furnace through the hot delivery roller table, and the heating furnace will heat the cast billet and send it to the rolling mill Rolling is performed. 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→in...

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. 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

3) The single rolling time is short, there are frequent steel biting and steel throwing processes, and it is impossible to achieve stable online roll gap adjustment

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 heat preservation cover is used for heat preservation, and the surface temperature of the billet in the rough rolling unit will drop to about 900°C, and the core temperature is only 950°C, and the bite temperature of the rough rolling unit is relatively low

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 and rolling device for producing long products" (CN202667242U) uses a roller hearth heating furnace to heat the continuous casting slab. Although the traditional heating furnace is cancelled, there are still high investment in equipment, and the production still consumes a lot of electric energy or fuel. The problem of large oxidation burning loss

Invention patent "Continuous casting and rolling device and method for producing long products" (CN102764762A) The rear of the cutting machine of the continuous casting machine is closely connected with a roller hearth heating furnace, a traverse device and a rolling mill capable of low temperature rolling. Realize the continuous casting and rolling process of long products, thereby greatly reducing the energy consumption of conventional production of long products. However, after continuous casting, the cutting machine takes up a large length, which leads to the temperature drop of the rolling mill and the increase of the motor power of the roughing rolling unit.

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