An intelligent control method for fine-grained rolling of rebar

Abstract

The invention discloses a thread steel fine grain rolling intelligent control technology, and relates to the field of thread steel production. The thread steel fine grain rolling intelligent control technology comprises the production process flows of refining of steel blanks-intelligent control of heating of the steel blanks-rolling by a rough rolling machine-flying shearing by a first flying shearing machine-rolling by a medium rolling machine-intelligent control of cooling of medium-rolled pieces-flying shearing by a second flying shearing machine-rolling by a finish rolling mill-intelligent control of cooling of finish-rolled pieces-flying shearing by a third flying shearing machine-cooling by a cooling machine-collection of thread steel. In the thread steel production process, the intelligent control technology is adopted to control each process temperature, so that the thread steel finally obtains pearlite and ferrite structures under the condition of not adding V alloys, the production cost is saved, and the production efficiency is improved.

Description

[0001] Technical field: [0002] The invention relates to the field of screw steel production, in particular to an intelligent control method for fine grain rolling of screw steel. [0003] Background technique: [0004] my country is a well-deserved big country of iron and steel. In the past ten years since the beginning of the new century, my country's iron and steel industry has developed rapidly, and the output of crude steel has increased rapidly. %. At present, there are more than 1,400 iron and steel enterprises in the country. Among them, the output of rebar is about 300 million tons, and there are more than 500 production lines. [0005] At present, the level of automation and intelligence of domestic rebar production lines is relatively low, with high dependence on people and high cost. Rebar production has developed rapidly in recent years, from the original single-line rolling to two-slit, three-slit, four-slit, five-slit rolling, six-slit rolling has been success...

AI Technical Summary

Problems solved by technology

[0005] At present, the level of automation and intelligence of domestic rebar production lines is relatively low, with high dependence on people and high cost

Rebar production has developed rapidly in recent years, from the original single-line rolling to two-slit, three-slit, four-slit, five-slit rolling, six-slit rolling has been successfully tested, and the level of automation control has improved. Improvement, but the level of intelligent control is low, the work involving on-site operations such as rolling process, control cooling system and production collection process still needs to be manually operated, the control lags behind, the accuracy is poor, and the labor intensity of personnel is high

Before 2000, due to the limitation of controlled cooling technology, conventional rolling technology was mostly used in the production of rebar. The process flow is: steelmaking billet—steel rolling heating furnace—rough rolling mill—No. 1 flying shear—middle rolling mill—No. 2 flying shear—finishing rolling mill— No. 3 flying shear—cooling bed—collection, the final rolling temperature is basically the same as the temperature of the upper cooling bed, above 1000°C, due to the high temperature, in order to ensure the performance of the steel, only alloying elements can be added, such as the production of HRB400 steel, in C, Si , Mn reaches the upper limit range, and more than 0.025% of the V alloy must be added, and the billet production cost is high

In order to meet the requirements of the new national standard for rebar, the conventional rolling process can only be restored under the current technical level, while increasing Si and Mn to the upper limit range, and at the same time adding more than 0.025% of V alloy, which increases the production cost. Reduction of cost on the premise of conforming to the new national standard for rebar has become an urgent problem to be solved in the rebar industry

Images