A slab buckle control method considering rolling specification changes

Abstract

The present invention discloses a slab buckle control method that takes into account changes in rolling specifications. The method includes the following steps: S1: obtaining the current pass process parameters of the slab of the current rolling specification at the production site; S2: calculating the current pass template sled coefficient of the slab of the current rolling specification; S3: at the production site, after the rolling specification of the slab changes, obtaining the current pass process parameters of the slab after the specification change; S4: calculating the current pass template sled coefficient of the slab after the specification change; S5: calculating the current pass sled coefficient of the slab after the specification change; S6: sending the current pass sled coefficient of the slab after the specification change to the rolling basic automation control system and calculating the roller speed value for the actual rolling process on site, thereby realizing automatic buckle control. The present invention calculates the current pass sled coefficient of the slab after the specification change through existing data, has a fast calculation speed, and realizes buckle control for slabs of different specifications.

Description

Technical Field

[0001] The present invention belongs to the technical field of steel rolling automatic control, and in particular relates to a slab buckle control method taking into account changes in rolling specifications. Background Art

[0002] Buckle head is a common defect during the rough rolling process of hot strip mills. If buckle head control is ineffective, the rolled product can impact the guard plates and rollers, and in severe cases, even cause steel pile-up accidents. The current hot strip rough rolling process involves a wide variety of slab types and a high rolling pace, necessitating effective automatic buckle head control for slabs with varying rolling specifications.

[0003] Among the existing technologies for buckle head control, the sled coefficient control method is currently the most commonly used method. The buckle head control within the head range of the slab is achieved by adjusting the speed ratio of the upper and lower rollers. However, the current sled coefficient control method still relies on manual operation and cannot achieve automatic setting of the slab sled coefficient after the rolling specifications change. It lacks an accurate and efficient control method. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above problems existing in the prior art and to provide a slab buckle control method that takes into account changes in rolling specifications. The current pass sled coefficient of the slab after the specification change is calculated by the reduction rate, entrance thickness, and initial sled coefficient. It has a faster calculation speed and can realize buckle control of slabs of different specifications.

[0005] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0006] A method for controlling slab buckling head considering rolling specification changes, the method comprising the following steps:

[0007] S1: Obtain the current pass process parameters of the current rolling specification slab at the production site;

[0008] S2: Calculate the current pass template sled coefficient of the current rolling specification slab;

[0009] S3: At the production site, after the rolling specifications of the slab are changed, the current pass process parameters of the slab after the specification change are obtained;

[0010] S4: Calculate the current pass template sled coefficient of the slab after the specification changes;

[0011] S5: Calculate the current pass sled coefficient of the slab after the specification changes;

[0012] S6: The current pass sled coefficient of the slab after the specification change is sent to the rolling basic automation control system, and the upper and lower roller speeds are obtained by calculation and applied to the site.

[0013] Furthermore, in step S1, the current pass process parameters of the current rolling specification slab include the current pass slab entrance thickness of the current rolling specification slab Current pass reduction rate of the current rolling specification slab And the sled coefficient of the i-th pass of the current rolling specification slab

[0014] in, as well as Where i is the pass number, and the current pass slab entrance thickness of the current rolling specification slab is The unit is mm.

[0015] Furthermore, the specific process of step S2 is as follows:

[0016] S21: Construct a function. The constructed function is:

[0017]

[0018] Wherein, i is the track number;

[0019] x i is the discrete value of all sled coefficients in the settable interval at pass i;

[0020] p1, p2, p3 are coefficients, and their value range is [-2, 2];

[0021] S22: According to the function constructed in step S21 and the current pass process parameters of the current rolling specification slab in step S1, the current pass parameter x of the current rolling specification slab is obtained. i The optimal solution is the current pass template sled coefficient of the current rolling specification slab, and the calculation formula is as follows:

[0022]

[0023] in, It is the template sled coefficient of the i-th pass of the current rolling specification slab.

[0024] Furthermore, in step S3, the current pass process parameters of the slab after the specification change include the current pass slab entrance thickness of the slab after the specification change The slab reduction rate of the current pass after the specification change

[0025] Wherein, i is the track number; The unit is mm.

[0026] Furthermore, the specific process of step S4 is as follows:

[0027] S41: Construct a function. The constructed function is:

[0028]

[0029] Wherein, i is the track number;

[0030] y i is the discrete value of all sled coefficients in the settable interval when the pass is i;

[0031] p1, p2, p3 are coefficients, and their value range is [-2, 2];

[0032] S42: According to the function constructed in step S41 and the current pass process parameters of the slab after the specification change in step S3, the current pass parameter y of the slab after the specification change is obtained. i The optimal solution is the current pass template sled coefficient of the slab after the specification changes. The calculation formula is as follows:

[0033]

[0034] in, is the template sled coefficient of the i-th pass of the slab after the specification changes.

[0035] Furthermore, in step S5, the calculation formula of the current pass sled coefficient of the slab after the specification change is as follows:

[0036]

[0037] Wherein, i is the track number;

[0038] β is a coefficient, and its value range is [0.5, 1.5];

[0039] is the sled coefficient of the i-th pass obtained on site, that is, the sled coefficient of the i-th pass of the slab of the current rolling specification;

[0040] is the template sled coefficient of the slab at the i-th pass after the specification changes;

[0041] is the template sled coefficient of the i-th pass of the current rolling specification slab.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] 1. The present invention provides a slab buckle control method that takes into account changes in rolling specifications. The current pass sled coefficient of the slab after the specification change is calculated by the reduction rate, entrance thickness, and initial sled coefficient. It has a fast calculation speed and can realize buckle control of slabs of different specifications.

[0044] 2. The present invention calculates the current pass sled coefficient of the slab after the specification change, and sends the current pass sled coefficient of the slab after the specification change to the rolling basic automation control system, so that real-time adjustment can be performed. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0046] Figure 1 It is a flow chart of the control method provided by the present invention. DETAILED DESCRIPTION

[0047] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0048] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0049] like Figure 1 As shown, a slab buckle head control method considering the rolling specification change includes the following steps:

[0050] S1: Obtain the current pass process parameters of the current rolling specification slab at the production site, wherein the current pass process parameters of the current rolling specification slab include the current pass slab entrance thickness of the current rolling specification slab Current pass reduction rate of the current rolling specification slab And the sled coefficient of the i-th pass of the current rolling specification slab

[0051] Wherein, i is the track number;

[0052] S2: Calculate the current pass template sled coefficient of the current rolling specification slab;

[0053] The specific process of step S2 is as follows:

[0054] S21: Construct a function. The constructed function is:

[0055]

[0056] Wherein, i is the track number;

[0057] x i is the discrete value of all sled coefficients in the settable interval at pass i;

[0058] p1, p2, p3 are coefficients, and their value range is [-2, 2];

[0059] S22: According to the function constructed in step S21 and the current pass process parameters of the current rolling specification slab in step S1, the current pass parameter x of the current rolling specification slab is obtained. i The optimal solution is the current pass template sled coefficient of the current rolling specification slab, and the calculation formula is as follows:

[0060]

[0061] Among them, since i is the track number, It can also be expressed as the template sled coefficient of the i-th pass of the current rolling specification slab;

[0062] S3: At the production site, after the rolling specifications of the slab are changed, the current pass process parameters of the slab after the specification change are obtained, wherein the current pass process parameters of the slab after the specification change include the current pass entrance thickness of the slab after the specification change Current pass reduction rate of slab after specification change

[0063] S4: Calculate the current pass template sled coefficient of the slab after the specification changes;

[0064] The specific process of step S4 is as follows:

[0065] S41: Construct a function. The constructed function is:

[0066]

[0067] Wherein, i is the track number;

[0068] y i is the discrete value of all sled coefficients in the settable interval when the pass is i;

[0069] p1, p2, p3 are coefficients, and their value range is [-2, 2];

[0070] S42: According to the function constructed in step S41 and the current pass process parameters of the slab after the specification change in step S3, the current pass parameter y of the slab after the specification change is obtained. iThe optimal solution is the current pass template sled coefficient of the slab after the specification changes. The calculation formula is as follows:

[0071]

[0072] Among them, since i is the track number, It can also be expressed as the template sled coefficient of the slab at the i-th pass after the specification changes;

[0073] S5: Calculate the current pass sled coefficient of the slab after the specification changes. The calculation formula is as follows:

[0074]

[0075] Wherein, i is the track number;

[0076] β is a coefficient, and its value range is [0.5, 1.5];

[0077] is the sled coefficient of the i-th pass obtained on site, i.e., the sled coefficient of the i-th pass of the slab of the current rolling specification calculated in step S22;

[0078] is the template sled coefficient of the slab at the i-th pass after the specification changes;

[0079] is the template sled coefficient of the i-th pass of the current rolling specification slab;

[0080] S6: Send the current pass sled coefficient of the slab after the specification change calculated in step S5 to the rolling basic automation control system and calculate the roller speed value for the actual rolling process on site.

[0081] In step S6, specifically:

[0082] S61: The current pass sled coefficient of the slab after the specification change Issued to the rolling basic automation control system;

[0083] S62: The rolling base automation control system receives the current pass sled coefficient of the slab after the specification change Finally, since the actual production on site uses the lower roller as the reference roller, the upper roller speed acting on the site is calculated; specifically:

[0084]

[0085] Among them, v up is the upper roller speed, in m / s, obtained through calculation;

[0086] v down is the lower roller speed in m / s, obtained through the on-site level 1 system;

[0087] S63: The calculated upper roller speed is sent to the transmission system of the rolling equipment. The transmission system adjusts the upper roller speed according to the received instruction, thereby realizing automatic control of the buckle head.

[0088] The present invention provides a slab buckle control method that takes into account changes in rolling specifications. The current pass sled coefficient of the slab after the specification change is calculated by the reduction rate, entrance thickness, and initial sled coefficient. The method has a fast calculation speed and can realize buckle control of slabs of different specifications.

[0089] Example 1

[0090] The following is a further explanation of a slab buckle control method considering rolling specification changes provided by the present invention in conjunction with a specific rolling specification change. In this embodiment, p1 = -1.00234191398539, p2 = -0.327525008695551, p3 = 0.627178277842561, β = 1, i = 2;

[0091] This embodiment provides a slab buckle control method considering rolling specification changes, which specifically includes the following steps:

[0092] Step 1: Obtain the second pass process parameters of the current rolling specification slab on site, and obtain the current specification slab They are 50, 0.3, and -2 respectively;

[0093] Step 2: Calculate the template sled coefficient of the current rolling specification slab. The calculation formula is:

[0094]

[0095] Substituting the data into the calculation, the template sled coefficient of the current rolling specification slab can be obtained. is 0;

[0096] Step 3: At the production site, after the rolling specifications of the slab are changed, the process parameters of the slab after the specification change are obtained. Among the process parameters of the slab after the specification change, 80 and 0.2 respectively;

[0097] Step 4: Calculate the formwork sled coefficient of the slab after the specification changes;

[0098] The calculation formula for the current pass template sled coefficient of the slab after the specification changes is:

[0099]

[0100] Calculate the template sled coefficient of the slab after the specification changes is 1;

[0101] Step 5: Calculate the sled coefficient of the slab after the specification change;

[0102] through Calculate the current pass sled coefficient of the slab after the specification changes The value is -1;

[0103] Step 6: The current pass sled coefficient of the slab after the specification change calculated in step 5 The value of -1 is sent to the rolling automation control system, and the on-site roll speed v is obtained through the on-site level 1 system. down is 3.23m / s,

[0104]

[0105] Calculate the upper roller speed v up The value is 3.26m / s. The calculated upper roll speed is sent to the transmission system of the rolling equipment to adjust the upper roll speed, thereby realizing automatic control of the buckle head.

[0106] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0107] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the invention as claimed.

Claims

1. A method for controlling slab buckle head considering rolling specification changes, characterized in that: The method comprises the following steps: S1: Obtain the current pass process parameters of the current rolling specification slab at the production site; S2: Calculate the current pass template sled coefficient of the current rolling specification slab; S3: At the production site, after the rolling specifications of the slab are changed, the current pass process parameters of the slab after the specification change are obtained; S4: Calculate the current pass template sled coefficient of the slab after the specification changes; S5: Calculate the current pass sled coefficient of the slab after the specification changes; S6: Send the current pass sled coefficient of the slab after the specification change to the rolling basic automation control system, and calculate the roll speed value for the actual rolling process on site; In step S1, the current pass process parameters of the current rolling specification slab include the current pass slab entrance thickness of the current rolling specification slab Current pass reduction rate of the current rolling specification slab And the sled coefficient of the i-th pass of the current rolling specification slab in, as well as Where i is the pass number, and the current pass slab entrance thickness of the current rolling specification slab is The unit is mm; The specific process of step S2 is as follows: S21: Construct a function. The constructed function is: Wherein, i is the track number; x i is the discrete value of all sled coefficients in the settable interval at pass i; p1, p2, p3 are coefficients, and their value range is [-2, 2]; S22: According to the function constructed in step S21 and the current pass process parameters of the current rolling specification slab in step S1, the current pass parameter x of the current rolling specification slab is obtained. i The optimal solution is the current pass template sled coefficient of the current rolling specification slab, and the calculation formula is as follows: in, It is the template sled coefficient of the i-th pass of the current rolling specification slab; In step S5, the calculation formula of the current pass sled coefficient of the slab after the specification change is as follows: Wherein, i is the track number; β is a coefficient, and its value range is [0.5, 1.5]; is the sled coefficient of the i-th pass obtained on site, that is, the sled coefficient of the i-th pass of the slab of the current rolling specification; is the template sled coefficient of the slab at the i-th pass after the specification changes; is the template sled coefficient of the i-th pass of the current rolling specification slab.

2. The method for controlling slab buckle head considering rolling specification changes according to claim 1, characterized in that: In step S3, the current pass process parameters of the slab after the specification change include the current pass slab entrance thickness after the specification change and the current pass slab reduction rate after specification changes Wherein, i is the track number; The unit is mm.

3. The method for controlling slab buckle head considering rolling specification changes according to claim 2, characterized in that: The specific process of step S4 is as follows: S41: Construct a function. The constructed function is: Wherein, i is the track number; y i is the discrete value of all sled coefficients in the settable interval when the pass is i; p1, p2, p3 are coefficients, and their value range is [-2, 2]; S42: According to the function constructed in step S41 and the current pass process parameters of the slab after the specification change in step S3, the current pass parameter y of the slab after the specification change is obtained. i The optimal solution is the current pass template sled coefficient of the slab after the specification changes. The calculation formula is as follows: in, is the template sled coefficient of the i-th pass of the slab after the specification changes.

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