CN109550783B

CN109550783B - Rolling method of one-pass trapezoidal slab

Info

Publication number: CN109550783B
Application number: CN201811587493.8A
Authority: CN
Inventors: 王鹏; 王渐灵; 王正; 徐挺; 于朋
Original assignee: Ansteel Group Chaoyang Steel Co ltd
Current assignee: Ansteel Group Chaoyang Steel Co ltd
Priority date: 2018-12-25
Filing date: 2018-12-25
Publication date: 2021-03-16
Anticipated expiration: 2038-12-25
Also published as: CN109550783A

Abstract

A rolling method of a one-pass trapezoidal slab comprises the steps of cutting a one-pass slab produced by rough rolling into slabs with the length less than or equal to 15 m, and marking the position of thickness cross change; longitudinally cutting the plate blank with the actual width smaller than the order width to ensure that the plate blank has the same width as the target width or is rolled super-wide; arranging and rolling products with the thickness specification of more than or equal to 2.5 mm; measuring the actual thickness, width, length and theoretical weight of the plate blank; after the plate blank is put into the furnace, modifying plate blank loading data issued by a third-level computer into actual plate blank data in a second-level mathematical model database; and the thick plate section is punched towards the rolling line direction, when the thin plate section is rolled, a rough rolling operator switches the rolling mill to manual operation, the roller way is maintained to rotate forwards, the plate blank transfer of the current pass is completed, then the manual control of the rolling mill is converted into automatic control, and the roller way rotates backwards to perform the next pass of automatic rolling. The invention adopts a series of operation and control techniques to ensure that the slab is rolled smoothly in one pass and reduce economic loss.

Description

Rolling method of one-pass trapezoidal slab

Technical Field

The invention belongs to the technical field of metallurgical hot rolling production, and particularly relates to a rolling method of a one-pass trapezoidal slab.

Background

In the hot rolling production process, slab blanks which are subjected to remelting operation are returned after the head of the rough rolling bites steel and rolls for a certain distance due to equipment and production faults and the like, the slab blanks are similar to trapezoids, namely the thicknesses of the head and the tail are inconsistent, the conventional method is to judge the waste of the partially rolled slab blanks, through statistics, 20 partially rolled remelting slab blanks in one pass can be generated in one year, the waste is directly judged, and huge economic loss is caused to a company.

Disclosure of Invention

The invention aims to provide a rolling method of a primary trapezoidal plate blank, the primary trapezoidal plate blank is in a trapezoidal shape due to special appearance specification, roll gaps need to be changed on the premise of ensuring steel biting signals in the rolling process, the rolling method belongs to a free rolling technology, the control is complex, the rolling difficulty coefficient is extremely high, and the risk of steel sticking and steel scrap is extremely high. The invention adopts a series of operation and control techniques to ensure that the slab is rolled smoothly in one pass and reduce economic loss.

In order to achieve the purpose, the invention adopts the following technical scheme:

a rolling method of a one-pass trapezoidal slab comprises the following specific steps:

1) cutting the plate blank of one pass generated by rough rolling into a plate blank with the length less than or equal to 15 meters, and marking the position of the thickness cross change;

2) longitudinally cutting the plate blank with the actual width smaller than the order width, removing the part with the width not meeting the standard, and ensuring that the width of the plate blank is as wide as the target width or is rolled super-wide;

3) carrying out planned hanging connection, and arranging and rolling products with the thickness specification of more than or equal to 2.5 mm;

4) measuring the actual thickness, width, length and theoretical weight of the plate blank, wherein the width is required to define the trend of the whole width;

5) after the plate blank is put into the furnace, modifying plate blank loading data issued by a third-level computer into plate blank actual data in a second-level mathematical model database, and inputting according to the actual size measured in the step 4) to ensure the accuracy of model calculation;

6) the method comprises the steps that slabs with different thicknesses are rolled, thick plate sections are punched towards the rolling line direction, a mathematical model carries out roll gap setting according to the thick plate sections, when the thin plate sections are rolled, a rough rolling operator carries out 'quick opening' treatment on a rolling mill at a thickness cross change position marked in advance, the rolling mill is switched to manual operation, the roller way is maintained to rotate forwards, slab transferring of the current pass is completed, then 'resetting' operation is carried out, manual control of the rolling mill is converted into automatic control, and the roller way rotates backwards to carry out automatic rolling of the next pass.

Compared with the prior art, the invention has the beneficial effects that:

the invention relates to a rolling method of a one-pass trapezoidal plate blank, which adopts a series of operation and control technologies to ensure that the one-pass plate blank is smoothly rolled and reduce economic loss.

Drawings

Fig. 1 is a schematic view (a) of a trapezoidal slab.

Fig. 2 is a schematic view (ii) of a trapezoidal slab.

Detailed Description

The following further illustrates embodiments of the invention:

1) for a one-pass plate blank generated by rough rolling, a steel rolling operation area is responsible for cutting the plate blank into a plate blank with the length less than or equal to 15 meters, the longer the plate blank with uneven thickness (such as the plate blank mixed with 150mm and 110 mm), the better the plate blank, the part with the thickness approximately consistent to the greatest extent, is cut on one plate blank, and the thickness cross change position is marked; (as shown in FIG. 1 and FIG. 2)

2) Longitudinally cutting a slab contact continuous casting operation area with the actual width of the slab smaller than the order width, and removing a part with the width not meeting the standard, wherein the specific width is set by a production technology room in charge of contacting a planner to ensure that the width of the slab is the same as or ultra-wide with the target width;

3) plan hanging is carried out in connection with a plan, rolling specifications need to be communicated with planners in advance, and products with the thickness specification of more than or equal to 2.5mm are arranged to be rolled;

4) for the plate blank hanging an order, a steel rolling operation area is connected with a plate blank field in advance for carrying out stack reversing, and the actual thickness, the width, the length and the theoretical weight of the plate blank are measured, wherein the width defines the whole width trend and can not only measure the data of one point;

5) after the plate blank is put into the furnace, modifying plate blank loading data issued by a three-level (manufacturing execution system) computer into plate blank actual data in a secondary mathematical model database, and recording according to the actual size measured in the step 4) to ensure the accuracy of model calculation;

the loading data of the plate blank transmitted by the third-level (manufacturing execution system) computer is the data of the standard plate blank, so the manual modification is needed in the second-level mathematical model database;

6) the method is characterized in that slabs with different thicknesses are rolled, the thick plate section is enabled to be flushed to the rolling line direction, roll gap setting is carried out according to 150mm through a mathematical model, when the slabs are rolled to 110mm, due to the fact that rolling force is detected to be lost and is smaller than 300 tons, the risk of channel jump can occur immediately, steel clamping accidents are easily caused, in order to avoid the occurrence of the steel clamping accidents, the mathematical model carries out roll gap setting according to the thick plate section, when the slabs are rolled to the thin plate section, a roughing operator carries out 'quick opening' treatment on a rolling mill at a thickness cross change position marked in advance, the rolling mill is switched to manual operation, the forward rotation of a roller way is maintained, the slab of the channel is transferred, then 'resetting' operation is carried out, manual control of the rolling mill is converted into.

After the rolling is completed, the mathematical model technician needs to correct the learning offset of the rough rolling outlet and the finish rolling outlet according to the actual width condition of the rolling, and needs to fully consider the influence of rolling extension and dog bone recovery to correct the learning coefficient and then continue the rolling.

Claims

1. A rolling method of a one-pass trapezoidal slab is characterized by comprising the following steps:

1) cutting the plate blank of one pass generated by rough rolling into a plate blank with the length less than or equal to 15 meters, cutting the part with the thickness which is uneven and tends to be consistent to a plate blank, and marking the position of the thickness cross change;