Method for adjusting the rectangularity of a slab caster mould

Abstract

The present application belongs to the field of steelmaking continuous casting, and relates to a method for adjusting the rectangularity of a slab continuous casting mold, which can reduce or even eliminate the increase of the joint gap caused by the change of the rectangularity during the on-line use of the mold, prevent the start-up leakage and steel clamping leakage of the continuous casting machine, reduce the unplanned casting interruption frequency of the continuous casting machine, improve the operation rate of the continuous casting machine, meet the factory capacity index requirement, reasonably match the production of the iron-steel interface and the steel-rolling interface, and reduce the production cost.

Description

Technical Field

[0001] This invention belongs to the field of steelmaking continuous casting and relates to a method for adjusting the rectangularity of the crystallizer in a slab continuous casting machine. Background Technology

[0002] The crystallizer is the billet forming device in continuous casting equipment, and it is also the heart of the continuous casting machine. Its function is to continuously inject molten steel into its inner cavity and force it to be cooled by water-cooled copper walls, thereby removing the heat of the molten steel and gradually solidifying it into a billet with the required cross-sectional shape and shell thickness.

[0003] If the rectangular deviation of the copper plate in the slab crystallizer is ≥0.5mm, the gaps at the corners of the inner wall of the crystallizer will increase due to thermal expansion and contraction during online use. Molten steel splashing into the gaps can cause steel jamming or even steel leakage, damaging the equipment and reducing the operating rate of the continuous casting machine and the service life of the crystallizer, directly affecting the company's profits. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a method for adjusting the rectangularity of the crystallizer of a slab continuous casting machine, so as to reduce or eliminate the problem of increased gaps caused by changes in the rectangularity of the crystallizer during online use.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a method for adjusting the rectangularity of a slab continuous casting machine crystallizer, comprising the following steps:

[0006] S1, pressurize the hydraulic pump to 18-20MPa to open the crystallizer, adjust the width to the maximum cross-sectional specification position, and adjust the taper of the side copper plate by 1% taper;

[0007] S2, hydraulic pump depressurization, adjust the opening size of the upper and lower openings of the crystallizer according to the cross-sectional specifications;

[0008] S3, pressurize the hydraulic pump to the initial pressure of 8-9MPa, and measure the displacement compensation of the clamping cylinder as 2-3mm;

[0009] S4, with the help of shims, adjust the nut alignment gap at the connection between the narrow side back plate and the width adjustment mechanism linkage to ensure that the rectangularity is ≤0.5mm and the corner gap is ≤0.15mm;

[0010] S5, hydraulic pump pressure relief measurement rectangle ≤ 0.5mm, corner gap ≤ 0.1mm;

[0011] S6, open the crystallizer, adjust the width to ±2mm in the width direction, repeat steps S5-S6, adjust the measurement rectangle to ≤0.5mm, and the corner gap to ≤0.1mm;

[0012] S7, open the crystallizer and adjust the width back to the cross-sectional dimension position.

[0013] Optionally, the thickness error of the copper plate in the crystallizer assembly is ≤0.3mm on each horizontal line in the transverse direction, and the thickness error is ≤0.3mm when measuring the copper plate thickness at equal distances above and below the center line in the longitudinal direction.

[0014] The beneficial effects of this invention are as follows: This invention provides a method for adjusting the rectangularity of the crystallizer in a slab continuous casting machine. This method can reduce or even eliminate the increase in gaps caused by changes in the rectangularity of the crystallizer during online use. It can prevent leakage during the start-up of the continuous casting machine and leakage due to steel clamping, reduce the number of unplanned interruptions in casting, improve the casting machine's operating rate, meet the factory's capacity requirements, and at the same time, reasonably match the production flow of the iron-steel interface and the steel-rolling interface, thereby reducing production costs.

[0015] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Detailed Implementation

[0016] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0017] This invention discloses a method for adjusting the rectangularity of a slab continuous casting machine crystallizer, the technical solution of which is as follows:

[0018] 1. The thickness error of the copper plate in the crystallizer assembly is ≤0.3mm on each horizontal line in the transverse direction, and the thickness error is ≤0.3mm when measured at equal distances above and below the center line of the copper plate in the longitudinal direction;

[0019] 2. Pressurize the hydraulic pump to 18-20MPa, open the crystallizer, adjust the width to the maximum cross-sectional specification position, and adjust the taper of the side copper plate by 1%.

[0020] 4. Depressurize the hydraulic pump and adjust the opening size of the upper and lower openings of the crystallizer according to the cross-sectional specifications (within the cross-sectional tolerance range, for example, for a 230*1530mm cross-sectional crystallizer, the upper opening is 241.4mm and the lower opening is 240mm in the thickness direction).

[0021] 3. Pressurize the hydraulic pump to the initial pressure of 8-9 MPa, and measure the displacement compensation of the clamping cylinder as 2-3 mm;

[0022] 5. Adjust the nut alignment gap at the connection between the narrow side back plate and the width adjustment mechanism linkage with the shims to ensure that the rectangularity is ≤0.5mm and the corner gap is ≤0.15mm;

[0023] 6. The rectangularity of the hydraulic pump pressure relief measurement is ≤0.5mm, and the corner gap is ≤0.1mm;

[0024] 7. Open the crystallizer and adjust the width to ±2mm in the width direction. Repeat steps 5-6 to adjust the measurement. The rectangularity should be ≤0.5mm and the corner gap should be ≤0.1mm. (If the rectangularity exceeds the standard, it will cause the narrow face to be skewed, resulting in quality problems in the billet. If the corner gap is large, it will cause steel to be stuck, and in severe cases, it will lead to steel leakage accidents.)

[0025] 8. Open the crystallizer and adjust the width back to the cross-sectional size position (within the range of cross-sectional size shrinkage ratio, for example, 230*1530mm, the upper width of low carbon steel is 1544mm and the lower width is 1528.6mm, to ensure that the cross-section is within the qualified range before machine operation, and reduce the waste of production time in machine adjustment).

[0026] The beneficial effects of this invention are: 1. Increased continuous casting operation rate; 2. Reduced steel leakage accidents.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for adjusting the rectangularity of a slab continuous casting machine crystallizer, characterized in that, Includes the following steps: S1, pressurize the hydraulic pump to 18-20MPa to open the crystallizer, adjust the width to the maximum cross-sectional specification position, and adjust the taper of the side copper plate by 1% taper; S2, hydraulic pump depressurization, adjust the opening size of the upper and lower openings of the crystallizer according to the cross-sectional specifications; S3, pressurize the hydraulic pump to the initial pressure of 8-9MPa, measure the displacement of the clamping cylinder, and compensate for 2-3mm. S4, with the help of shims, adjust the nut alignment gap at the connection between the narrow side back plate and the width adjustment mechanism linkage to ensure that the rectangularity is ≤0.5mm and the corner gap is ≤0.15mm; S5, hydraulic pump depressurization, measured rectangularity ≤ 0.5mm, corner gap ≤ 0.1mm; S6, open the crystallizer, adjust the width to ±2mm in the width direction, repeat steps S5-S6, adjust the measurement rectangle to ≤0.5mm, and the corner gap to ≤0.1mm; S7, open the crystallizer and adjust the width back to the cross-sectional dimension position.

2. The method for adjusting the rectangularity of the crystallizer in a slab continuous casting machine according to claim 1, characterized in that: The thickness error of the copper plate in the crystallizer assembly is ≤0.3mm on each horizontal line, and the thickness error is ≤0.3mm when measured at equal distances above and below the center line of the copper plate in the longitudinal direction.