Crystallizer vibration control method suitable for high-pulling-speed continuous casting and application

Abstract

The invention belongs to the technical field of metallurgical machinery, and particularly relates to a crystallizer vibration control method suitable for high-pulling-speed continuous casting and application. According to the method, a mathematical model is established for the vibration curve of the high-pulling-speed continuous casting crystallizer, through theoretical formula derivation and numerical calculation, the vibration curve is composed of seven lines including a straight line segment AB, a cosine line BC, a straight line CD, a cosine line DEF, a straight line FG, a cosine line GH and a straight line HI, and a speed expression, a displacement expression and an acceleration expression are given in sequence. And finally simulating, calculating and drawing a displacement curve, a speed curve and an acceleration curve. The vibration curve has the advantages that under the same pulling speed, the vibration acceleration is small, the vibration is stable, and the system load is small; the acceleration curve is continuous and guidable, vibration is stable, and basic guarantee is provided for good casting blank surface quality. And finally, the method is used for design guidance of the vibration mode of the high-pulling-speed continuous casting crystallizer.

Description

Technical Field

[0001] The invention belongs to the technical field of metallurgical machinery, and in particular relates to a crystallizer vibration control method suitable for high-speed continuous casting and an application thereof. Background Art

[0002] The crystallizer is the core equipment of the continuous casting machine. For the high-speed continuous casting machine, the high-speed crystallizer vibration model is the core technology of the high-speed crystallizer equipment. The crystallizer vibration model in the existing technology is no longer suitable for the high-speed continuous casting machine, which makes the crystallizer poorly lubricated, thereby reducing the surface quality of the casting and increasing the risk of bonding and steel leakage.

[0003] After searching, in the prior art, the application number is 20081004369.1, and the invention name is a vibration method for a continuous casting crystallizer. The continuous casting crystallizer is driven by a servo driver, and the control system of the continuous casting crystallizer controls the operation of the servo driver. The actuator of the servo driver drives the continuous casting crystallizer to vibrate. In each vibration cycle, the actuator drives the continuous casting crystallizer to move upward, and starts to make sinusoidal vibration when approaching the top of the amplitude, until it passes the bottom of the next amplitude, and then the actuator drives the continuous casting crystallizer to move upward at a uniform speed until it approaches the top of the next amplitude. It uses a mathematical model combining a straight line and a sine function to conveniently generate non-sinusoidal function waveforms with different process requirements, improve the quality of castings, and reduce production costs.

[0004] The patent application number is 95117447.9, and the invention name is a non-sinusoidal vibration curve (mode) of a crystallizer and a vibration device thereof. It discloses a group of non-sinusoidal vibration curves (modes) of a crystallizer, wherein the non-sinusoidal vibration curve (mode) III can be realized by mechanical vibration. The use of any one of the non-sinusoidal vibration curves (modes) can significantly increase the casting speed, reduce the leakage rate and improve the surface quality of the casting. The crystallizer vibration device that mechanically realizes the non-sinusoidal vibration curve (mode) III disclosed in the invention has the advantages of low investment, high reliability, strong safety and less maintenance workload than the non-sinusoidal vibration device driven by a hydraulic servo system.

[0005] The application number is 89100466, and the name of the invention is a method and device for vibrating a continuous casting crystallizer. It is carried out by a vibrating component with an adjustable amplitude depending on the billet drawing speed. The vibration mode is sawtooth-shaped. During the movement, the crystallizer basically exceeds the billet drawing speed during the entire downward movement, and the vibration frequency increases during this period.

[0006] However, none of the above patents can satisfy the vibration mode of the crystallizer of high-speed continuous casting. Therefore, it is very necessary to develop a vibration control method for the crystallizer of a high-speed continuous casting machine. Summary of the invention

[0007] The present invention provides a crystallizer vibration control method and application suitable for high-speed continuous casting.

[0008] To achieve the above object, the technical solution adopted by the present invention is: A crystallizer vibration control method suitable for high-speed continuous casting, the crystallizer is driven by a servo motor, the control system of the crystallizer controls the servo motor in each vibration cycle to adjust the vibration frequency of the crystallizer according to a preset control curve model, the preset control curve model is composed of a straight line segment AB, a cosine line BC, a straight line CD, a cosine line DEF, a straight line FG, a cosine line GH and a straight line HI.

[0009] The preset control curve model is:

[0010] Where:

[0011]

[0012] in: v 0 is the speed in m / s; f 2 The frequencies of cosine lines BC, DEF and GH are equal, in Hz; t is time, in seconds; α is the skewness, dimensionless, ranging from 0 to 100%; f is the natural frequency of the cosine line, in Hz; h is the stroke, in m; t A , t B , t C , t D , t F , t G , t H , t I They respectively represent the moments corresponding to the positions of points A, B, C, D, F, G, H, and I, in seconds.

[0013] The displacement expression of the crystallizer is: .

[0014] The acceleration expression of the crystallizer is: .

[0015] The invention discloses an application of a crystallizer vibration control method suitable for high-speed continuous casting, and applies the crystallizer vibration control method suitable for high-speed continuous casting to the crystallizer vibration control of high-speed continuous casting.

[0016] Beneficial effects: The present invention establishes a mathematical model for the vibration curve of a high-speed continuous casting crystallizer. Through theoretical formula derivation and numerical calculation, the vibration curve is composed of a total of 7 segments, namely, a straight line segment AB, a cosine line BC, a straight line CD, a cosine line DEF, a straight line FG, a cosine line GH and a straight line HI. The velocity expression → displacement expression → acceleration expression are sequentially given, and finally the displacement curve, the velocity curve and the acceleration curve are simulated and calculated and drawn. The vibration curve has the characteristics of small vibration acceleration, stable vibration and small system load at the same drawing speed; the acceleration curve is continuously derivable, the vibration is stable, and a basic guarantee is provided for good surface quality of the casting blank, and finally it is used for the design guidance of the vibration mode of the high-speed continuous casting crystallizer.

[0017] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the velocity image of the vibration curve in the present invention.

[0020] Figure 2 It is a schematic diagram of the vibration displacement curve of the high pulling speed crystallizer in the present invention.

[0021] Figure 3 This is the vibration speed curve of the high-speed crystallizer in the present invention.

[0022] Figure 4 This is the vibration acceleration curve of the high-speed crystallizer in the present invention. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Embodiment 1: according to Figure 1-Figure 4 A crystallizer vibration control method suitable for high-speed continuous casting is shown, the crystallizer is driven by a servo motor, and the control system of the crystallizer controls the servo motor in each vibration cycle to adjust the vibration frequency of the crystallizer according to a preset control curve model, and the preset control curve model is composed of a straight line segment AB, a cosine line BC, a straight line CD, a cosine line DEF, a straight line FG, a cosine line GH and a straight line HI, as shown in FIG. Figure 1 shown.

[0025] Wherein, the preset control curve model is:

[0026] Where:

[0027]

[0028] in: v 0 is the speed in m / s; f 2 The frequencies of cosine lines BC, DEF and GH are equal, in Hz; t is time, in seconds; α is the skewness, dimensionless, ranging from 0 to 100%; f is the natural frequency of the cosine line, in Hz; h is the stroke, in m; t A , t B , t C , t D , t F , t G , t H , t I Respectively represent the time corresponding to the position of points A, B, C, D, F, G, H, and I, in seconds 。

[0029] In some embodiments, the displacement expression of the crystallizer is: .

[0030] The high-speed crystallizer vibration displacement curve formed is as follows: Figure 2 shown.

[0031] In some embodiments, the acceleration expression of the crystallizer is: .

[0032] The curve formed is as follows Figure 4 shown.

[0033] Embodiment 2: The invention discloses an application of a crystallizer vibration control method suitable for high-speed continuous casting, and applies the crystallizer vibration control method suitable for high-speed continuous casting to the crystallizer vibration control of high-speed continuous casting.

[0034] By using the mold vibration control method suitable for high-speed continuous casting, guidance is provided for the design of high-speed continuous casting mold vibration mode.

[0035] Embodiment three: This embodiment is for h=0.0062m, f=1.667 Hz, The displacement, velocity and acceleration are as follows: Negative sliding time: 0.10394s Positive sliding time: 0.49601s Negative sliding distance: 0.00193m Maximum ascending speed: 0.01561m / s Maximum descent speed: 0.0616m / s Maximum acceleration: 0.7834m / s 2 .

[0036] In the absence of conflicts, technicians in this field can combine the relevant technical features in the above examples according to actual conditions to achieve corresponding technical effects. The specific combinations are not described here one by one.

[0037] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0038] In addition, the descriptions of "first", "second", etc. in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0039] The above are only preferred embodiments of the present invention. The present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features disclosed herein. Any simple modification, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A crystallizer vibration control method suitable for high-speed continuous casting, characterized in that: The crystallizer is driven by a servo motor. The control system of the crystallizer controls the servo motor in each vibration cycle to adjust the vibration frequency of the crystallizer according to a preset control curve model. The preset control curve model is composed of a straight line segment AB, a cosine line BC, a straight line CD, a cosine line DEF, a straight line FG, a cosine line GH and a straight line HI.

2. A crystallizer vibration control method suitable for high-speed continuous casting according to claim 1, characterized in that: The preset control curve model is: Where: in: v0 is the speed, in m / s; f2 is the frequency of cosine line BC, cosine line DEF and cosine line GH, which are equal and the unit is Hz; t is time, in seconds; α is the skewness, dimensionless, ranging from 0 to 100%; f is the natural frequency of the cosine line, in Hz; h is the stroke, in m; t A , t B , t C , t D , t F , t G , t H , t I They respectively represent the moments corresponding to the positions of points A, B, C, D, F, G, H, and I, in seconds.

3. A crystallizer vibration control method suitable for high-speed continuous casting as claimed in claim 2, characterized in that: The displacement expression of the crystallizer is: 。 4. A crystallizer vibration control method suitable for high-speed continuous casting as claimed in claim 2, characterized in that: The acceleration expression of the crystallizer is: 。 5. An application of a crystallizer vibration control method suitable for high-speed continuous casting, characterized in that: The crystallizer vibration control method suitable for high-speed continuous casting as claimed in any one of claims 1 to 4 is applied to the crystallizer vibration control of high-speed continuous casting.

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