Long-bar rolling production line and production technology thereof

Abstract

The invention discloses a long-bar rolling production line and a production technology thereof, and belongs to the technical field of bar rolling. The production line comprises a continuous casting machine, a withdrawal and straightening machine, a pre-rolling emergency shear, a roughing mill unit, a head cutting flying shear, an intermediate mill unit, a finishing mill unit, a reducing and sizing unit and a cooling bed which are connected by roller beds in sequence, wherein the continuous casting machine is a single-machine uniflow continuous casting machine; and the roller bed between the continuous casting machine and the roughing mill unit is a heat preservation roller bed. The production technology comprises the steps of: carrying out single-machine uniflow continuous casting, carrying out heat preservation by using the conveying roller bed, straightening by using the withdrawal and straightening machine, rolling by using the roughing mill unit, rolling by using the intermediate mill unit, rolling by using the finishing mill unit, rolling by using the reducing and sizing unit, cooling and collecting. The long-bar rolling production line and the production technology have the beneficial effects that round billets are directly rolled after the round billets are cast by using the single-machine uniflow continuous casting machine, thereby reducing middle working procedures and heat loss, realizing endless rolling, meanwhile omitting a heating surface and reducing a failure rate in a production process.

Description

technical field [0001] The invention belongs to the technical field of bar rolling, and in particular relates to a long product rolling production line and a production process thereof. Background technique [0002] 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→intermediate rolling unit→finishing Rolling unit → collection device. Among them, the multi-strand slabs need to be transferred to the rack of the steel splitter in batc...

AI Technical Summary

Problems solved by technology

There are many problems and deficiencies in this production method: 1) After the multi-strand slabs are collected, they are sent to the rolling workshop in a complicated process and take a long time; 2) The production process is long and the temperature loss is high. If the direct hot delivery, the temperature at the entrance of the rolling mill Too low results in a substantial increase in mill power

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 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 invention patent "Continuous Casting and Rolling Method for Producing Profile Bars and Wires Using Waste Heat of Molten Steel" (CN102310078A) proposes a continuous casting and rolling method for profile bars and wires. Low, the shortcomings of too many rolling mills and excessive investment when using multi-strand production

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

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