A method for improving the online calibration accuracy of a hinged sector

Abstract

The present application relates to a kind of method for improving the precision of hinged sector online calibration, belong to the technical field of precision calibration method.The specific steps include the following steps: (1) adjusting segment pressure reduction pressure;(2) calibration segment cylinder pressure;(3) modify segment calibration block size;(4) design segment position sensor numerical compensation function;(5) when bearing play appears, to roll gap value compensation;(6) to roll gap instrument data is corrected.The present application provides a kind of method for improving the precision of hinged sector online calibration, by optimizing segment pressure reduction pressure, uniform segment online and offline preparation pressure, calibration pressure segmented control, optimization limit block size, increase roll gap compensation program, correct roll gap instrument detection data etc.Method, greatly improve the precision of online segment equipment, with good popularization value.

Description

Technical Field

[0001] This invention belongs to the technical field of accuracy calibration methods, specifically relating to a method for improving the online calibration accuracy of hinged sector segments. Background Technology

[0002] Continuous casting is a production process that involves continuously casting molten steel at high temperatures into billets of a specific shape and size. The main equipment of a continuous casting machine includes a crystallizer, a fan-shaped section, and a cutting zone. The molten steel undergoes primary cooling in the crystallizer to form a sufficiently thick shell, and then undergoes secondary cooling in the fan-shaped section, completely converting the molten steel from liquid to solid.

[0003] The fan-shaped sections of SMS and Danieli continuous casting machines are mostly designed with hinges. These fan-shaped sections are connected by pins and pin holes, resulting in a large gap. During the preparation process, the fan-shaped sections are placed horizontally, and the gap between the pins and pin holes can be completely eliminated by gravity. However, after the fan-shaped sections are put into operation, they are changed from being placed horizontally to being placed at an angle. This causes displacement of the contact surface of the pins and pin holes. Under the action of gravity, the fan-shaped sections exhibit the characteristics of "large inlet and small outlet," and the roll gap is distributed in a "sawtooth" shape. The roll gap tester data all fall outside the target value, and there are large differences between the fan-shaped sections, making it impossible to effectively guarantee the roll gap accuracy of the online fan-shaped sections.

[0004] The online accuracy of the roll gap in continuous casting machines has a significant impact on the internal quality of the cast billet. Excessive tolerance in the roll gap between sections can cause intermediate crack defects. Overall roll gap deviation in the sector section affects the light reduction effect of the sector section and has a significant impact on center segregation. Compared with the tie-rod sector section, the internal quality of the cast billet produced by the hinged sector section is at least one grade lower in terms of center segregation rating.

[0005] Therefore, for continuous casting production, there is a need for a simple, effective, and easily promoted method to improve the online calibration accuracy of hinged sector segments. Summary of the Invention

[0006] To address the aforementioned problems in the existing technology, this invention provides a method for improving the online calibration accuracy of hinged sector segments, thereby solving these problems. By adopting the following procedures and operating methods, the roller gap deviation caused by gravity in the hinged sector segments can be effectively eliminated, thus improving the online calibration accuracy of the sector segments.

[0007] The technical solution of the present invention is as follows:

[0008] A method for improving the online calibration accuracy of hinged sector segments includes the following steps:

[0009] (1) Adjust the pressing pressure of the sector segment; (2) Calibrate the cylinder pressure of the sector segment; (3) Modify the size of the sector segment calibration block; (4) Design the numerical compensation function of the sector segment position sensor; (5) Compensate for the roll gap value when the bearing clearance occurs; (6) Correct the roll gap instrument data.

[0010] Preferably, the specific method of step (1) is as follows: the pressing pressure of the sector segment during offline preparation is adjusted to 400-500KN. The hinged sector segment will have a limit block designed at the sector segment frame. During offline preparation, the sector segment is pressed firmly onto the limit block to ensure the standard roll gap during offline preparation. After demonstration, for every 100KN increase in pressing pressure, the roll gap of the sector segment is reduced by 0.1-0.2mm. At a pressure of 400-500KN, the gap of the limit block can be effectively eliminated. At the same time, the deformation of the sector segment is small, and the roll gap is closer to the real roll gap.

[0011] Preferably, the specific method of step (2) is as follows: unify the cylinder pressure of the sector segment during online calibration and offline preparation. At the same time, in order to better limit the gap, modify the calibration pressure curve to staged control. The initial pressure is set to 100KN±5KN. When the pressure of the four cylinders of the sector segment is stable at 100KN±5KN, increase the pressure to 300KN±5KN. After the pressure is stable, continue to increase it to 500KN±5KN. It should be consistent with the offline preparation pressure to ensure that the hinged sector segment can be gradually compacted during online calibration, and to ensure that the sector segment mating surface is in complete and effective contact, which is closest to the offline preparation state.

[0012] Preferably, the specific method of step (3) is as follows: the calibration block used for calibration on the sector segment is designed to be a standard block that is closer to the design section of the casting machine. The size of the calibration block is designed according to the design thickness of the casting machine - 10mm, that is, the calibration roll gap of the sector segment = design thickness - 10mm, so that the online calibration is closer to the roll gap state of actual production and the calibration accuracy is improved.

[0013] Preferably, the specific method of step (4) is as follows: design a numerical compensation function for the sector segment position sensor to achieve the following functions: 1. The calibration value of the sensor can be displayed on the operation screen each time the sector segment is calibrated; 2. A window is added to the operation screen so that the sector segment position sensor can be manually set to a compensation value. After the position sensor value is compensated, the actual value = calibration value + compensation value is satisfied, thereby realizing the direct compensation of the sensor value by the manually compensated sector segment.

[0014] Preferably, the specific method of step (5) is as follows: through the sensor compensation function, the system automatically records the reading of the position sensor when the sector segment is first online and calibrated. After the sector segment has been online for a period of time, when the bearing clearance appears, the roll gap value is compensated by 0.1-0.2mm, thereby eliminating the deviation caused by the increase in clearance after online operation and the increase in the roll gap value of the sector segment, so as to ensure the consistency between the roll gap value of the online and newly replaced sector segments.

[0015] Preferably, the specific method of step (6) is as follows: optimize the roll gap meter program, correct the roll gap meter data according to the state of the highest online operating accuracy of the equipment, and correct the "sawtooth" roll gap diagram of the hinged fan segment according to the target value through the program, so as to obtain a roll gap diagram in which the roll gap meter detection data can fall into the target value range, so as to facilitate the monitoring of the online accuracy of the equipment.

[0016] Preferably, when the roll gap meter's detection data deviates from the target value, the deviation between the detected value and the target value is directly compensated to the sensor reading, reducing operational deviations caused by manual measurement, thereby ensuring that the roll gap meter's pattern is in the same trend.

[0017] The beneficial effects of this invention are as follows:

[0018] This invention provides a method for improving the online calibration accuracy of hinged sector segments. By optimizing the sector pressing pressure, unifying the online and offline preparation pressure of sector segments, segmented control of calibration pressure, optimizing the size of limit blocks, adding a roll gap compensation program, and correcting the roll gap instrument detection data, the accuracy of online sector segment equipment is significantly improved, and it has great potential for widespread application. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a test image before the roller seam machine program was corrected in Embodiment 1 of the present invention.

[0021] Figure 2 This is the detection diagram after the roller seam tester program was corrected according to Embodiment 1 of the present invention.

[0022] In the figure, the roll gap detection value before correction showed a "sawtooth" fluctuation, and after correction, the roll gap detection value was adjusted to be horizontal. Detailed Implementation

[0023] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0024] Example 1

[0025] This invention provides a method for improving the online calibration accuracy of hinged sector segments, applied in a 150×3250mm slab continuous casting machine to produce steel billets with a cross-sectional size of 150×3250mm, comprising the following steps:

[0026] (1) Adjust the pressing pressure of the sector segment: The pressing pressure of the sector segment during offline preparation is designed to be 400KN, and the pressure is used as the basis for the overall roll gap value of the sector segment.

[0027] (2) Calibrate the cylinder pressure of the sector segment: Modify the calibration pressure curve to staged control, set the initial pressure to 100KN±5KN, the second stage pressure to 300KN±5KN, and the final calibration pressure to 400KN±5KN.

[0028] (3) Modify the size of the sector section calibration block: the thickness of the casting machine section is 150mm, and the calibration block is designed to be 140mm.

[0029] (4) Design the numerical compensation function of the sector segment position sensor, which is achieved as follows: 1. The calibration value of the sensor can be displayed in the level 1 screen each time the sector segment is calibrated. 2. Design the sector segment roll gap correction value window in the sector segment calibration screen, which can realize the compensation of the values ​​of all sector segment position sensors. The compensation relationship is actual value = calibration value + compensation value.

[0030] (5) After two days of online use of the newly replaced sector segment, bearing clearance will appear, causing the roll gap to widen. At this time, compensate 0.2mm at each of the four positions of the sector segment in the roll gap correction window of the corresponding sector segment.

[0031] (6) Refer to the data when the equipment had the highest online accuracy during the initial stage of production (see details). Figure 1 The roll gap meter program was corrected to straighten the "sawtooth" roll gap pattern into an approximately horizontal straight line, so that the detected value fell close to the target value (see details). Figure 2 ).

[0032] (7) When the roll gap tester data deviates from the target value, the difference between the roll gap test value and the target value is input into the corresponding position of the roll gap correction window, thereby compensating for the deviation of the roll gap tester data.

[0033] Although the present invention has been described in detail with reference to the accompanying drawings and preferred embodiments, the invention is not limited thereto. Various equivalent modifications or substitutions can be made to the embodiments of the invention by those skilled in the art without departing from the spirit and essence of the invention, and such modifications or substitutions should all be within the scope of the invention. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the invention should also be covered within the protection scope of the invention. Therefore, the protection scope of the invention should be determined by the scope defined in the claims.

Claims

1. A method for improving the accuracy of online calibration of hinged fan segments, characterized in that, It comprises the following steps: (1) adjusting the segment pressure; (2) calibrating the cylinder pressure of the segment; (3) modifying the size of the segment calibration block; (4) designing the numerical compensation function of the segment position sensor; (5) compensating the roll gap value when bearing play occurs; (6) correcting the roll gap instrument data; The specific method of step (1) is to adjust the segment pressure to 400KN during offline preparation. The specific method of step (2) is to uniformly calibrate the cylinder pressure of the segment during online calibration and offline preparation, and to modify the calibration pressure curve to phased control in order to better eliminate the gap between the limit blocks, with the starting pressure set to 100KN±5KN; when the pressure of the four cylinders of the segment stabilizes at 100KN±5KN, the pressure is increased to 300KN±5KN; after the pressure stabilizes, it is continuously increased to 400KN±5KN. The specific method of step (4) is to design the numerical compensation function of the segment position sensor, which realizes the following functions: a. The calibration value of the sensor during each calibration of the segment can be displayed in the operation picture; b. A window is added in the operation picture to set the compensation value for the segment position sensor, and after the numerical value of the position sensor is compensated, the actual value satisfies the relationship actual value = calibration value + compensation value. The specific method of step (5) is to automatically record the reading of the position sensor when the segment is first calibrated online through the sensor compensation function, and to compensate the roll gap value by 0.1-0.2mm after the bearing play occurs during the use of the segment online for a period of time. The specific method of step (6) is to optimize the roll gap instrument program, correct the roll gap instrument data according to the highest online running accuracy of the equipment, and correct the "sawtooth" roll gap graph of the hinged segment according to the target value through the program, so as to obtain a roll gap graph whose detection data of the roll gap instrument can fall within the target value range, thereby facilitating the monitoring of the online accuracy of the equipment. When the detection data of the roll gap instrument deviates from the target value, the deviation between the detection data and the target value is directly compensated into the sensor reading, reducing the operation deviation caused by manual measurement, so as to realize that the roll gap instrument graph is in the same trend.

2. The method of claim 1, wherein, The specific method of step (3) is to design the calibration block used for calibration of the segment to be a standard block closer to the design section of the caster, and the size of the calibration block is calculated according to segment calibration roll gap = design thickness - 10mm.

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