Plate shape control method of aluminum strip stretching, bending and straightening unit

Abstract

The invention discloses a plate shape control method of an aluminum strip stretching, bending and straightening unit, which comprises the following steps of: 1, acquiring a plate shape measuring signal: arranging a plate shape measuring device, such as a plate shape roller, in the aluminum strip stretching, bending and straightening unit for acquiring a plate shape measuring signal of an aluminum strip; step 2, plate shape measurement signal processing: inputting a plate shape measurement signal into a processing system, and using a plate shape measurement signal curve as basic data; 3, calculating an elongation error and a rolling reduction error: processing the plate shape measurement signal by using a plate shape deviation processing algorithm, and calculating the elongation error and the rolling reduction error; and 4, calculating the adjustment amount based on the elongation error and the rolling reduction error. According to the method, accurate control is achieved, plate shape errors are accurately calculated through an optimization algorithm, the control accuracy is improved, quick response is achieved, the optimized controller design enables the system to quickly respond to plate shape changes, and adjustment is conducted in time.

Description

Technical Field

[0001] The invention relates to the technical field of plate shape adjustment, and in particular to a plate shape control method of an aluminum strip stretching, bending and straightening machine unit. Background Art

[0002] In the aluminum processing process, although the automatic control system of flatness has been adopted in the rolling process such as cold rolling mill and foil rolling mill to improve the flatness accuracy of aluminum strip, due to the high flatness requirements of industries such as packaging and printing, subsequent finishing processes are still required. Among them, the stretching, bending and straightening unit is the main equipment used to improve the flatness quality of the strip.

[0003] In the stretching bending and straightening unit, the plate shape is generally controlled by manually adjusting the elongation and the amount of pressure reduction. The operator manually sets the elongation and the amount of pressure reduction according to the incoming materials, equipment, and the conditions of the exported strip, and sends them to the actuator of the unit. However, this method requires manual observation of the exported plate shape and manual adjustment of the elongation and the amount of pressure reduction, which requires high operating experience, takes a long time to adjust, and is sometimes not easy to stabilize. Therefore, we propose a plate shape control method for the aluminum strip stretching bending and straightening unit to solve the above problems. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In view of the problems existing in the plate shape control method of the above-mentioned existing aluminum strip stretching, bending and straightening machine unit, the present invention is proposed.

[0006] Therefore, the purpose of the present invention is to provide a plate shape control method for an aluminum strip stretching, bending and straightening unit, which has precise control: accurately calculating the plate shape error through an optimization algorithm to improve control accuracy; fast response: the optimized controller design enables the system to quickly respond to changes in plate shape and make timely adjustments.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a plate shape control method of an aluminum strip stretching, bending and straightening unit, comprising the following steps:

[0008] Step 1: Obtaining a flatness measurement signal: A flatness measurement device, such as a flatness roller, is provided in the aluminum strip stretching, bending and straightening unit to obtain a measurement signal of the aluminum strip flatness;

[0009] Step 2: Flatness measurement signal processing: input the flatness measurement signal into the processing system and use the flatness measurement signal curve as basic data;

[0010] Step 3: Calculate the elongation error and the press-down error: Use the plate shape deviation processing algorithm to process the plate shape measurement signal and calculate the elongation error and the press-down error;

[0011] Step 4: Calculation of adjustment amount: Based on the elongation error and the press-down error, the corresponding adjustment amount and press-down adjustment amount are calculated using the press-down and elongation controller;

[0012] Step 5: Determine whether the adjustment amount exceeds the limit: Determine whether the calculated adjustment amount exceeds the preset limit. If the adjustment amount exceeds the limit, use the maximum value as the adjustment amount.

[0013] Step 6: Execute adjustment: Send the calculated adjustment amount to the actuator, and the actuator performs corresponding operations according to the adjustment amount to adjust the shape of the aluminum strip.

[0014] As a preferred solution of the flatness control method of the aluminum strip stretching, bending and straightening unit of the present invention, wherein: the flatness measurement signal curve in the step 2 is expressed as a function f(x),

[0015] f(x)=ax 2 +bx+c

[0016] Among them, a, b, c are constants that represent the shape of the flatness curve, and x is the position variable.

[0017] As a preferred solution of the plate shape control method of the aluminum strip stretching, bending and straightening unit of the present invention, wherein: the elongation error calculation in the step 3 is:

[0018] Expressed by the slope of the curve, the slope function is g(x),

[0019]

[0020] Elongation error E strain It is expressed as:

[0021]

[0022] Among them, e and f are the starting and ending positions of the flatness curve, g target is the target elongation, and the absolute value function and integration are used to ensure that the absolute value of the error is always positive.

[0023] As a preferred solution of the shape control method of the aluminum strip stretching, bending and straightening unit of the present invention, wherein: the calculation of the press-down error in step 3 is:

[0024] The reduction of the flatness at position x is h(x), which is the integral of the flatness curve and is expressed as:

[0025]

[0026] Pressing error E pressure It is expressed as:

[0027]

[0028] Among them, h target is the target compression amount.

[0029] As a preferred solution of the plate shape control method of the aluminum strip stretching bending and straightening unit of the present invention, wherein: the equation after integrating the elongation error and the reduction error in step 4 is:

[0030] TotalError=E strain +E pressure

[0031] The range of this formula represents the overall situation of elongation error and reduction error.

[0032] As a preferred scheme of the plate shape control method of the aluminum strip stretching, bending and straightening machine unit described in the present invention, wherein: in the step five, it is determined whether the calculated adjustment amount exceeds the preset limit range. If the adjustment amount exceeds the limit, the adjustment amount is set to the maximum value of the limit to avoid damage to the equipment and materials.

[0033] As a preferred solution of the plate shape control method of the aluminum strip stretching, bending and straightening unit of the present invention, the plate shape control method of the aluminum strip stretching, bending and straightening unit uses a plate shape control system of the aluminum strip stretching, bending and straightening unit, including:

[0034] Shape measurement signal module, measurement signal processing module, reduction and elongation controller, stretch bending leveler and shape roller;

[0035] The flatness measurement signal module is used to obtain a measurement signal of the aluminum strip flatness;

[0036] The measurement signal processing module uses the plate shape measurement signal curve as basic data and inputs it into the pressing amount and elongation controller;

[0037] The press-down amount and elongation controller is used to calculate the elongation error and the press-down amount error and calculate the corresponding adjustment amount and the press-down amount adjustment amount;

[0038] The stretch bending straightening machine and the plate-shaped rollers are adjusted to perform corresponding operations to adjust the shape of the aluminum strip.

[0039] As a preferred scheme of the plate shape control method of the aluminum strip stretching, bending and straightening machine unit described in the present invention, wherein: a judgment and adjustment module is provided in the depression amount and elongation rate controller, and the judgment and adjustment module judges the calculated adjustment amount to determine whether it exceeds the preset limit. If the adjustment amount exceeds the limit, the maximum value is used as the adjustment amount.

[0040] Beneficial effects of the present invention:

[0041] Precise control: Accurately calculate the plate shape error through the optimization algorithm to improve the control accuracy.

[0042] Quick response: The optimized controller design enables the system to quickly respond to changes in plate shape and make timely adjustments.

[0043] High safety: limit value judgment is made on the adjustment amount to prevent damage to equipment and materials caused by over-limit adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. 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 creative labor. Among them:

[0045] Figure 1 It is a schematic diagram of the system structure of the plate shape control method of the aluminum strip stretching, bending and straightening unit of the present invention.

[0046] Figure 2 It is a schematic diagram of the measurement curve of the plate shape control method of the aluminum strip stretching, bending and straightening unit of the present invention. DETAILED DESCRIPTION

[0047] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0048] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0049] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0050] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0051] Reference Figure 1-2 , provides a plate shape control method for an aluminum strip stretching, bending and straightening unit, comprising the following steps:

[0052] Step 1: Obtaining a flatness measurement signal: A flatness measurement device, such as a flatness roller, is provided in the aluminum strip stretching, bending and straightening unit to obtain a measurement signal of the aluminum strip flatness;

[0053] Step 2: Flatness measurement signal processing: input the flatness measurement signal into the processing system and use the flatness measurement signal curve as basic data;

[0054] Step 3: Calculate the elongation error and the press-down error: Use the plate shape deviation processing algorithm to process the plate shape measurement signal and calculate the elongation error and the press-down error;

[0055] Step 4: Calculation of adjustment amount: Based on the elongation error and the press-down error, the corresponding adjustment amount and press-down adjustment amount are calculated using the press-down and elongation controller;

[0056] Step 5: Determine whether the adjustment amount exceeds the limit: Determine whether the calculated adjustment amount exceeds the preset limit. If the adjustment amount exceeds the limit, use the maximum value as the adjustment amount.

[0057] Step 6: Execute adjustment: Send the calculated adjustment amount to the actuator, and the actuator performs corresponding operations according to the adjustment amount to adjust the shape of the aluminum strip.

[0058] The flatness measurement signal curve in step 2 is expressed as a function f(x),

[0059] f(x)=ax 2 +bx+c

[0060] Among them, a, b, c are constants that represent the shape of the flatness curve, and x is the position variable.

[0061] Specifically, the elongation error calculation in step 3 is:

[0062] Expressed by the slope of the curve, the slope function is g(x),

[0063]

[0064] Elongation error Estrain It is expressed as:

[0065]

[0066] Among them, e and f are the starting and ending positions of the flatness curve, g target is the target elongation, and the absolute value function and integration are used to ensure that the absolute value of the error is always positive.

[0067] Among them, the pressure reduction error calculation in step 3 is:

[0068] The reduction of the flatness at position x is h(x), which is the integral of the flatness curve and is expressed as:

[0069]

[0070] Pressing error E pressure It is expressed as:

[0071]

[0072] Among them, h target is the target compression amount.

[0073] The equation after integrating the elongation error and the reduction error in step 4 is:

[0074] TotalError=E strain +E pressure

[0075] The range of this formula represents the overall situation of elongation error and reduction error.

[0076] Furthermore, in step five, it is determined whether the calculated adjustment amount exceeds a preset limit range. If the adjustment amount exceeds the limit, the adjustment amount is set to the maximum value of the limit to avoid damage to equipment and materials.

[0077] Specific embodiments:

[0078] Assume we have the following parameters:

[0079] a=1

[0080] b=2

[0081] c=3

[0082] k = 4 (target elongation)

[0083] m=10 (target pressing amount)

[0084] e=0

[0085] f = 5;

[0086] We first calculate the elongation error E strain and the pressure error E pressure ;

[0087] Elongation error calculation: Substituting k=4 into:

[0088]

[0089] Calculate the integral:

[0090] Calculation of the pressing error: Substitute the plate shape function h(x) into the pressing error formula:

[0091]

[0092] Next, calculate the total error TotalError = E strain +E pressure =15+E pressure

[0093] Assume that the calculated pressure error E pressure =20,

[0094] TotalError=15+20=35

[0095] Determine whether the adjustment amount exceeds the limit. Assume that the set maximum error is MaxError=30. Since Total Error=35>MaxError=30, the adjustment amount exceeds the limit. We use the maximum value as the adjustment amount.

[0096] The shape control method of the aluminum strip stretching, bending and straightening unit uses a shape control system of the aluminum strip stretching, bending and straightening unit, including:

[0097] Shape measurement signal module, measurement signal processing module, reduction and elongation controller, stretch bending leveler and shape roller;

[0098] The flatness measurement signal module is used to obtain the measurement signal of the flatness of the aluminum strip;

[0099] The measurement signal processing module uses the plate shape measurement signal curve as basic data and inputs it into the pressure reduction and elongation controller;

[0100] The press-down amount and elongation controller is used to calculate the elongation error and the press-down amount error and calculate the corresponding adjustment amount and press-down amount adjustment amount;

[0101] The stretch bending leveler and the plate-forming rollers are adjusted and operated accordingly to adjust the shape of the aluminum strip.

[0102] Specifically, a judgment and adjustment module is provided in the pressing amount and elongation rate controller, and the judgment and adjustment module judges the calculated adjustment amount to determine whether it exceeds a preset limit. If the adjustment amount exceeds the limit, the maximum value is used as the adjustment amount.

[0103] Reference Figure 2 , the target shape and the measured shape are similar curves, some open upwards and some open downwards. The role of the reduction and elongation is also to adjust similar curves. That is, given a standard target curve, the actual measured curve of the production strip is made to match the shape of the target curve as much as possible by adjusting the reduction and elongation.

[0104] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for controlling the shape of an aluminum strip stretching, bending and straightening machine, characterized in that: The following steps are involved: Step 1: Obtaining a flatness measurement signal: A flatness measurement device, such as a flatness roller, is provided in the aluminum strip stretching, bending and straightening unit to obtain a measurement signal of the aluminum strip flatness; Step 2: Flatness measurement signal processing: input the flatness measurement signal into the processing system and use the flatness measurement signal curve as basic data; Step 3: Calculate the elongation error and the press-down error: Use the plate shape deviation processing algorithm to process the plate shape measurement signal and calculate the elongation error and the press-down error; Step 4: Calculation of adjustment amount: Based on the elongation error and the press-down error, the corresponding adjustment amount and press-down adjustment amount are calculated using the press-down and elongation controller; Step 5: Determine whether the adjustment amount exceeds the limit: Determine whether the calculated adjustment amount exceeds the preset limit. If the adjustment amount exceeds the limit, use the maximum value as the adjustment amount. Step 6: Execute adjustment: Send the calculated adjustment amount to the actuator, and the actuator performs corresponding operations according to the adjustment amount to adjust the shape of the aluminum strip.

2. The shape control method of the aluminum strip stretching, bending and straightening unit according to claim 1 is characterized in that: The flatness measurement signal curve in step 2 is expressed as a function f(x), f(x)=ax 2 +bx+c Among them, a, b, c are constants that represent the shape of the flatness curve, and x is the position variable.

3. The shape control method of the aluminum strip stretching, bending and straightening unit according to claim 2 is characterized in that: Calculation of elongation error in step 3: Expressed by the slope of the curve, the slope function is g(x), Elongation error E strain It is expressed as: Among them, e and f are the starting and ending positions of the flatness curve, g target is the target elongation, and the absolute value function and integration are used to ensure that the absolute value of the error is always positive.

4. The shape control method of the aluminum strip stretching, bending and straightening unit according to claim 3 is characterized in that: Calculation of the pressure error in step 3: The reduction of the flatness at position x is h(x), which is the integral of the flatness curve and is expressed as: Pressing error E pressure It is expressed as: Among them, h target is the target compression amount.

5. The shape control method of the aluminum strip stretching, bending and straightening unit according to claim 4 is characterized in that: The equation after integrating the elongation error and the reduction error in step 4 is: TotalError=E strain +E pressure The range of this formula represents the overall situation of elongation error and reduction error.

6. The shape control method of the aluminum strip stretching, bending and straightening unit according to claim 5, characterized in that: In the step 5, it is determined whether the calculated adjustment amount exceeds the preset limit range. If the adjustment amount exceeds the limit, the adjustment amount is set to the maximum value of the limit to avoid damage to the equipment and materials.

7. The shape control method of the aluminum strip stretching, bending and straightening unit according to claim 1, characterized in that: The plate shape control method of the aluminum strip stretching, bending and straightening unit uses a plate shape control system of the aluminum strip stretching, bending and straightening unit, including: Shape measurement signal module, measurement signal processing module, reduction and elongation controller, stretch bending leveler and shape roller; The flatness measurement signal module is used to obtain a measurement signal of the aluminum strip flatness; The measurement signal processing module uses the plate shape measurement signal curve as basic data and inputs it into the pressing amount and elongation controller; The press-down amount and elongation controller is used to calculate the elongation error and the press-down amount error and calculate the corresponding adjustment amount and the press-down amount adjustment amount; The stretch bending straightener and the plate-shaped rollers are adjusted to perform corresponding operations to adjust the shape of the aluminum strip.

8. The shape control method of the aluminum strip stretching, bending and straightening unit according to claim 7, characterized in that: The pressing amount and elongation rate controller is provided with a judgment and adjustment module, which judges the calculated adjustment amount to determine whether it exceeds a preset limit. If the adjustment amount exceeds the limit, the maximum value is used as the adjustment amount.

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