CN110539024A

CN110539024A - method for reducing camber of steel plate based on disc shearing edge

Info

Publication number: CN110539024A
Application number: CN201910824826.2A
Authority: CN
Inventors: 孔德南; 曹树卫; 李勇; 黄重; 孙广辉; 王新志; 娄军魁; 李卫; 管刘辉; 肖彦忠; 刘海强; 夏志升; 王海燕; 王中岐; 宋卫华; 王晓峰; 吴军号; 白锦函; 安亮亮
Original assignee: Anyang Iron and Steel Co Ltd
Current assignee: Anyang Iron and Steel Co Ltd
Priority date: 2019-09-02
Filing date: 2019-09-02
Publication date: 2019-12-06
Anticipated expiration: 2039-09-02
Also published as: CN110539024B

Abstract

the invention provides a method for reducing camber of a steel plate based on a disc shearing edge, belongs to the technical field of metallurgical steel rolling, and particularly adjusts the influence of transverse slip moment on the camber of the steel plate, which is generated on the steel plate due to the difference of force between shearing edges at two sides and a pinch roll, by dynamically adjusting the clamping force of the pinch roll and adopting a double-length shearing method.

Description

method for reducing camber of steel plate based on disc shearing edge

Technical Field

the invention belongs to the technical field of metallurgical steel rolling, and relates to a method for reducing camber of a steel plate based on a disc shearing edge.

Background

The camber is a shape characteristic of the steel plate, and the schematic diagram is shown in the attached figure 2. The smaller the camber of the steel plate is, the more beneficial the subsequent process is for processing and use, and the camber is regulated to be less than 15mm/5m in the national standard. However, when the method is applied to pipe making and the like, the problem that the welding quality is affected due to incomplete edge milling is easily caused, and the camber is generally required to be smaller than 12mm/12 m.

the disc shear is continuous trimming equipment, can shear a steel plate with multiple scales, has the advantages of high efficiency and no trimming break point, but is easy to form a larger proportion of camber exceeding the use requirement after the steel plate is sheared due to the uncertainty of the original camber of a mother plate, the torque formed by the shearing force difference of two shear blades in the shearing process and the torque formed by the clamping force of a pinch roll in the application process, so that the scale is changed.

In order to overcome the problem that the edge of the disc is easily sheared, the following methods are commonly used: the method comprises the steps of shortening the replacement period of the shear blades and frequently checking the gaps between the shear blades to reduce the sliding of a steel plate; secondly, a method that a tractor limits the sliding of the steel plate in the trimming process through traction force is adopted. The method can improve the camber of the steel plate to a certain extent, but has limited effect, and simultaneously improves the requirements on the shearing edge and the clearance management; the method II can effectively reduce the camber, but needs to add a traction device and a corresponding centering device.

disclosure of Invention

the invention aims to provide a method for reducing camber of a steel plate based on a disc shearing edge, which does not need to increase equipment and can better reduce camber by adopting the method.

in order to achieve the purpose, the invention adopts the technical scheme that:

According to an embodiment of the invention, a method for reducing camber of a steel plate based on disc shearing edges is provided, which comprises a method for dynamically adjusting clamping force of a pinch roll and shearing by adopting double-length, and specifically comprises the following steps:

Calculating the length of the blank according to the specification of the finished steel plate product, so that the total length of the rolled steel plate is even times of the finished steel plate product; for example, the following steps are carried out: if the length of the finished steel plate is 12m fixed length, the total length of the rolled steel plate can be designed to be 24m, 48m, 72m, 96m, 120m and the like;

in the flying shear interruption process, the length of the trimming steel plate is set according to the fixed length requirement, and the length of the trimming steel plate is designed according to 2 times of the length of a finished steel plate; for example, the following steps are carried out: if the length of the finished steel plate is 12m to length, the total length of the trimming steel plate is designed to be 24 m;

Detecting the diameters of the shearing blades at two sides, wherein the diameter deviation is less than or equal to 1 mm;

adjusting the clearance between the shear blades at two sides to ensure that the clearance between the shear blades is less than or equal to the nominal thickness of the steel plate multiplied by 0.07 mm;

calibrating the position of a zero-returning target line, namely the position of one of the shear blades;

calibrating the position of the other shear blade, wherein the position value of the other shear blade is increased by 10mm on the basis of the nominal width of the steel plate;

calibrating two deviation line positions according to the sickle curve requirement; for example, the following steps are carried out: if the camber requirement is less than or equal to 12mm/12m, the off-line position needs to be set to be less than or equal to 6mm, but the off-line position is set to be 4mm optimal through tests, namely the off-line position No. 1 is set to be-4 mm, and the off-line position No. 2 is set to be +4 mm;

and during the shearing process, the edges of the steel plate run along a target line, when deviation occurs, if the edges of the steel plate touch one of the deviation lines, the opposite pinch roll is opened, and the pinch roll resumes clamping after the edges of the steel plate return to the target line.

the technical scheme solves the problems that: through double length steel plate length design, relative single length has increased the restriction effect of the outer district to steel sheet lateral sliding in the side cut in-process, has reduced the condition that the mother board has the camber to cause the side cut in-process to need centering many times relatively multiple length. The transverse sliding moment generated on the steel plate due to the difference of the shearing edges on the two sides and the pinch roll is passively weakened through the double length steel plate length design; the dynamic adjustment of the pinch roll is adopted, so that the influence of the transverse sliding moment on the camber of the steel plate, which is caused by the force difference between the shearing edges at the two sides and the pinch roll, on the steel plate is actively adjusted.

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

according to the technical scheme, through the double-length shearing design, the influence of camber of the original steel plate on the shearing quality is effectively reduced, and the limit of an outer area on the running track of the steel plate is increased; the clamping force of the pinch roll is dynamically adjusted, and the sheared steel plate cannot continuously slide in a single direction within a certain range. Finally reducing the camber of the finished steel plate.

Drawings

FIG. 1 is a schematic diagram of dynamically adjusting clamping force in an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a steel plate camber; wherein d is the width of the sickle curve;

In the figure, 1, a target line, 2, 1 off-line, 3, 2 off-line, 4, 1 cutting edge, 5, 2 cutting edge, 6, 1 pinch roll, 7, 2 pinch roll.

Detailed Description

in order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.

This example illustrates the method of reducing camber of steel plate based on shearing edge of disc, taking the production of X70 pipeline steel as an example. The specification of the finished product of the X70 pipeline steel is as follows: 14.3 × 2890 × 12000mmm, the width deviation requirement is as follows: 0-12 mm; camber: less than or equal to 12 mm. The specific method comprises the following steps:

Step 1: the specification of the finished product is 12m, a 6-time length production design is adopted, the head and tail cut-off parts are considered, and the length of the blank is 7150 mm;

Step 2: setting the shearing double length of the flying shear to be 2450 mm by considering the shearing deviation of the flying shear;

And step 3: detecting the diameters of the No. 1 shear blade 4 and the No. 2 shear blade 5, wherein the diameter deviation is less than or equal to 1 mm;

and 4, step 4: the clearance between the No. 1 shear blade 4 and the No. 2 shear blade 5 is respectively adjusted, so that the clearance between the No. 1 shear blade 4 and the No. 2 shear blade 5 is less than or equal to 1 mm;

and 5: calibrating the position of a return-to-zero target line 1 (namely the position of a No. 1 shear blade 4);

step 6: setting the position of No. 2 shear blade 5 as +2900 mm;

and 7: setting the 2 position of the No. 1 deviation line as-4 mm, and setting the 3 position of the No. 2 deviation line as +4 mm;

And 8: the edge of the steel plate runs along a target line in the shearing process, when the edge of the steel plate deviates, if the edge of the steel plate touches No. 1 deviation line 2, the No. 2 pinch roll 7 is opened, and after the edge of the steel plate returns to the target line 1, the No. 2 pinch roll 7 resumes clamping again; and if the edge of the steel plate touches the deviation line 3 No. 2, the pinch roll 6 No. 1 is opened, and the pinch roll 6 No. 1 recovers clamping after the edge of the steel plate returns to the target line 1.

The effect of the process of this example is shown in Table 1.

Table 1 effect of the method of example 1

example 2

this example illustrates the method of reducing camber of steel plate based on shearing edge of disc, taking the production of L290M pipeline steel as an example. L290M pipeline steel finished product specification: 11.9 × 2210 × 12000mmm, width deviation requirement: 0-12 mm; camber: less than or equal to 12 mm. The method comprises the following specific steps:

step 1: the specification of the finished product is 12m, 8-time length production design is adopted, the head and tail cut-off parts are considered, and the length of the blank is 8080 mm;

And 4, step 4: the clearance between the No. 1 shear blade 4 and the No. 2 shear blade 5 is respectively adjusted, so that the clearance between the No. 1 shear blade 4 and the No. 2 shear blade 5 is less than or equal to 0.8 mm;

Step 6: setting the position of a No. 2 shear blade 5 as +2220 mm;

and 8: the edge of the steel plate runs along a target line 1 in the shearing process, when the edge of the steel plate deviates, if the edge of the steel plate touches No. 1 deviation line 2, a No. 2 pinch roll 7 is opened, and after the edge of the steel plate returns to the target line 1, the No. 2 pinch roll 7 resumes clamping again; and if the edge of the steel plate touches the deviation line 3 No. 2, the pinch roll 6 No. 1 is opened, and the pinch roll 6 No. 1 recovers clamping after the edge of the steel plate returns to the target line 1.

the effect of the process implementation of this example is shown in table 2.

Table 2 effect of the method of example 2

Comparative example

the comparative example is the data statistics before the invention is carried out, and the statistical data are shown in Table 3.

table 3 reference data for comparative examples

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. a method for reducing camber of a steel plate based on disk shearing edge is characterized by comprising a method for dynamically adjusting clamping force of a pinch roll and shearing by adopting double-length, and specifically comprises the following steps:

Calculating the length of the blank according to the specification of the finished steel plate product, so that the total length of the rolled steel plate is even times of the finished steel plate product;

in the flying shear interruption process, the length of the trimming steel plate is set according to the fixed length requirement, and the length of the trimming steel plate is designed according to 2 times of the length of a finished steel plate;

Calibrating the position of a target line, namely the position of one of the shear blades;

Calibrating two deviation line positions according to the sickle curve requirement;