CN107962086B - Rolled piece pre-bending control method and device - Google Patents
Rolled piece pre-bending control method and device Download PDFInfo
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- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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Abstract
The invention provides a rolled piece pre-bending control method and device. In the method, a rolled piece pre-bending model is established, and the rolled piece pre-bending model comprises pre-bending displacement of different parts of a rolled piece. The pre-bending displacement is the same as the bending displacement of the rolled piece after cooling, and the direction is opposite. Therefore, before the rolled piece is cooled, all parts of the rolled piece are reversely extruded in a sectional type extrusion mode in advance, and the extrusion distance is pre-bending displacement. Because each part of the rolled piece is reversely extruded by the pre-bending displacement before cooling, the pre-bending displacement can complement the bending offset generated in the cooling process of the rolled piece, and further the cooled rolled piece is kept straight. The pre-bending control method for the rolled piece is complete in algorithm, simple and stable in control, so that pre-bending of different parts of the rolled piece can be accurately controlled, and the rolled piece can be kept straight after being cooled. The pre-bending control structure of the rolled piece provided by the invention is simple, and the pre-bending of the rolled piece can be realized on the basis of the control method.
Description
Technical Field
The invention relates to the technical field of automatic control, in particular to a rolled piece pre-bending control method and device.
Background
The steel is a material which is made into various required shapes, sizes and performances by pressure processing of steel ingots or billets, and is an indispensable important material for the construction of China. The steel materials are generally classified into four types, i.e., profile steels, plate steels, pipe steels and metal products, according to the shape of the cross section. The steel is rich in types and can be suitable for different application occasions.
The section steel is a bar-shaped steel material having a cross-sectional shape and a cross-sectional dimension, and is rolled from a billet. According to the different cross section shapes of the section steel, the section steel is divided into symmetrical section steel and asymmetrical section steel. In the process of rolling billets to form a section steel, the rolled stock is typically hot worked to form rolled stock of different shapes. And (4) after hot processing, the rolled piece enters a cooling bed for natural cooling, and then profile steel with different shapes is formed through subsequent finishing operation.
Because the section shapes of the section steels are different, the thicknesses of different parts on the same section are different. The difference in thickness results in different rates of heat transfer and, consequently, different rates of cooling at different locations on the same cross-section. Therefore, the rolled piece side bending problem is easy to occur when the rolled piece is cooled on the cooling bed, and particularly the side bending problem of the rolled piece is easy to occur due to the asymmetrical section steel. In addition, the lateral bending degree of the rolled piece is larger along with the increase of the asymmetry degree of the asymmetric section steel. When the rolled piece is bent to a certain extent, the conveying and subsequent finishing operation of the rolled piece can be influenced, and even production stop can be caused seriously.
Disclosure of Invention
The invention provides a pre-bending control method and device for a rolled piece, and aims to solve the problem that the rolled piece is easy to deform in the cooling process.
The invention provides a rolled piece pre-bending control method, which comprises the following steps:
establishing a rolled piece pre-bending model, wherein the rolled piece pre-bending model comprises pre-bending displacement of different parts in the length direction of a rolled piece; the pre-bending displacement is the bending displacement of the untreated rolled piece after cooling;
and after the rolled piece stops being transmitted, controlling a plurality of displacement devices to move towards the rolled piece direction according to the pre-bending displacement and different speeds, and controlling a plurality of displacement devices to start and stop simultaneously.
Preferably, the establishing of the rolled piece pre-bending model comprises the following steps:
determining a position-temperature change curve according to the cross section shape of a rolled piece and the material of the rolled piece;
determining bending displacement of different parts of the rolled piece according to the position-temperature change curve;
and determining pre-bending displacement according to the bending displacement.
Preferably, the controlling the plurality of the displacement devices to be stopped simultaneously includes:
screening the maximum pre-bending displacement;
the displacement device corresponding to the maximum pre-bending displacement moves at the maximum speed, and the time taken by the displacement device is the reference time of the plurality of displacement devices;
and when the moving time of the displacement devices reaches the reference time, controlling the plurality of displacement devices to stop simultaneously.
Preferably, the arrangement direction of the plurality of displacement devices is parallel to the conveying direction of the rolled piece, and the length of the plurality of displacement devices after arrangement is larger than that of the rolled piece.
Preferably, the method further comprises:
acquiring the length of the rolled piece;
matching the displacement device according to the length of the rolled piece;
and when the rolled piece stops transmission, controlling the arrangement length of the plurality of displacement devices to be the same as the length of the rolled piece, and arranging the plurality of displacement devices to be parallel to the rolled piece.
The invention provides a rolled piece pre-bending control device, which comprises a displacement device positioned on one side of a roller way; the arrangement direction of the displacement devices is parallel to the transmission direction of the roller way;
the device further comprises:
the calculation unit is used for establishing a rolled piece pre-bending model;
and the control unit is used for controlling the displacement device to move.
Preferably, the calculation unit is further configured to select the rolled piece pre-bending model according to the currently produced section steel.
Preferably, the control unit is further configured to acquire the product length;
matching the displacement device according to the length of the rolled piece;
and when the rolled piece stops transmission, controlling the arrangement length of the plurality of displacement devices to be the same as the length of the rolled piece, and arranging the plurality of displacement devices to be parallel to the rolled piece.
Preferably, the control unit is further configured to control the head end in the moving direction of the rolled product to be parallel to the first one of the displacement devices when the rolled product is stopped from being transported.
Preferably, the displacement device is a moving trolley.
The technical scheme provided by the embodiment of the invention can have the following beneficial effects:
the invention provides a rolled piece pre-bending control method and device. In the rolled piece pre-bending control method, a rolled piece pre-bending model is established at first. The established rolled piece pre-bending model comprises pre-bending displacement of different parts in the length direction of the rolled piece. The pre-bending displacement is the same as the bending displacement of the rolled piece after cooling, and the direction is opposite. And in the process of heat treatment and transportation of the rolled pieces, after the rolled pieces move to the position of the displacement device, the rolled pieces stop being transported. At this time, the rolled stock is parallel to the plurality of displacement devices. And controlling a plurality of displacement devices to move towards the rolled piece according to the pre-bending displacement in the same time and at different moving speeds. And simultaneously controlling a plurality of displacement devices to start and stop simultaneously. The uncooled rolled piece can be extruded and deformed due to the movement of the displacement device, and the deformation of each part of the rolled piece is determined according to the pre-bending displacement. Because the pre-bending displacement is the same as the bending displacement of the rolled piece after cooling and the direction is opposite, the pre-bending displacement can compensate the bending deformation of the rolled piece in the cooling process, so that the cooled rolled piece is kept straight.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.
FIG. 1 is a diagram of rolled piece deformation provided by an embodiment of the present invention;
FIG. 2 is a diagram of a rolled piece pre-bending deformation process provided by an embodiment of the invention;
FIG. 3 is a schematic structural diagram of a rolled piece pre-bending control device provided by the embodiment of the invention.
Detailed Description
The sectional shapes of the section steels are different, so the thicknesses of different parts on the same section are different. The difference in thickness results in different rates of heat transfer and, consequently, different rates of cooling at different locations on the same cross-section. Therefore, the rolled piece side bending problem is easy to occur when the rolled piece is cooled on the cooling bed, and particularly the side bending problem of the rolled piece is easy to occur to the asymmetrical section steel, as shown in the attached drawing 1. In addition, the lateral bending degree of the rolled piece is larger along with the increase of the asymmetry degree of the asymmetric section steel. When the rolled piece is bent to a certain extent, the conveying and subsequent finishing operation of the rolled piece can be influenced, and even production stop can be caused seriously.
In order to solve the above problem, an embodiment of the present invention provides a rolled piece pre-bending control method, including:
s01: establishing a rolled piece pre-bending model, wherein the rolled piece pre-bending model comprises pre-bending displacement of each part in the length direction of a rolled piece; and the pre-bending displacement is the bending displacement of the untreated rolled piece after cooling.
Because the problem of lateral bending deformation of the rolled piece is easy to occur when the rolled piece is cooled on a cooling bed, in order to keep the rolled piece straight after being cooled, the rolled piece is pre-bent in advance after being subjected to heat treatment. During pre-bending treatment, the pre-bending direction is opposite to the lateral bending deformation direction, and the pre-bending degree is the same as the lateral bending degree after cooling. According to the rolled piece pre-bending control method provided by the embodiment of the invention, pre-bending of different positions of the rolled piece is realized by adopting a sectional pre-bending control mode.
Specifically, since the thicknesses of different portions on the same section of the section steel are different, the heat conduction rates and, consequently, the cooling rates of the different portions are different, and thus, the rate of change in the temperature of the rolled piece is related to the thicknesses of the different portions on the same section. In addition, different rolled piece materials can also enable the same position to generate different heat conduction rates, so that the position-temperature change curve of the rolled piece with the same material can be determined by monitoring the rolled piece materials, the rolled piece section shape and the metal temperature change rate. The bending displacement of the rolled piece at different positions can be determined according to the position-temperature change curve. The bending displacement is the distance of different parts of the rolled piece deviating from the central line of the rolled piece after the rolled piece is cooled. In order to keep the rolled piece straight after cooling, the degree of pre-bending is the same as the degree of lateral bending after cooling, and the pre-bending direction is opposite to the lateral bending deformation direction, so the numerical value of the pre-bending displacement is the same as that of the bending displacement. Due to the fact that the pre-bending displacement of each part of the rolled piece is different in size, pre-bending of different parts of the same rolled piece in different degrees can be achieved through a sectional control mode.
The problem of lateral bending of the rolled piece of the asymmetric profile steel is the most serious, and the measurement shows that when the length of the rolled piece of the asymmetric profile steel is 20m, the bending of two ends of the rolled piece is serious, so that the pre-bending treatment needs to be performed on two ends of the rolled piece emphatically, and the middle area with small deformation is not pre-bent and only needs to perform steel pushing action.
According to the established rolled piece pre-bending model, the following calculation formula of pre-bending displacement can be obtained:
wherein y is the pre-bending displacement and is along the pushing direction of the displacement device; x is the position of the roller way where the displacement device is located and is along the direction of the roller way; a is the elbow length of a rolled piece; b is the bent tail length of the rolled piece; l-a-b is the length of the middle section; l is the total length of the rolled piece; k is the elbow coefficient; t is a tail bending coefficient; m is the steel pushing stroke.
Because the shape and the material of the rolled piece are different, the deformation degree of the rolled piece is also different, so that different rolled piece pre-bending models need to be established according to different rolled piece shapes and materials, and the rolled piece pre-bending models are convenient to call when the section steel is produced.
S02: and after the rolled piece stops being conveyed, controlling a plurality of displacement devices to move towards the rolled piece direction at different speeds within the same time according to the pre-bending displacement, and simultaneously starting and stopping the plurality of displacement devices.
Referring to fig. 2, fig. 2 is a diagram illustrating a pre-bending deformation process of a rolled piece in the rolled piece pre-bending control method according to the embodiment of the invention.
Before the rolled piece is subjected to pre-bending treatment, different rolled piece pre-bending models need to be called according to the section steel produced at present. The plurality of moving devices are arranged in a row, and the arrangement direction of the plurality of moving devices is parallel to the conveying direction of the rolled piece. In order to control the movement of the moving device, a plurality of moving devices are arranged in parallel at one side close to the rolled piece.
And when the rolled piece is conveyed to the position of the moving device, controlling the rolled piece to stop conveying. And after the rolled piece stops being transported, controlling the plurality of moving devices to simultaneously move towards the rolled piece at different speeds. When the moving device touches the rolled piece, the moving device pushes the rolled piece to move, and then the rolled piece is pre-bent in an extrusion mode. And the moving distance of the moving device after contacting the rolled piece is determined according to the pre-bending displacement obtained by the calculation of the formula. And after the moving devices move the pre-bending displacement, controlling all the moving devices to stop moving at the same time, and controlling the moving devices to return to the initial positions to wait for the next movement. Because the moving time of the moving device is the same, and the moving displacement and the moving speed are different, pre-bending of the rolled piece at different positions and different degrees can be realized, and the bending degree of the rolled piece in the cooling process can be further compensated.
In order to prevent the same rolled piece from being unbent at partial positions, the length of the moving devices arranged in a row is larger than that of the rolled piece. Further, to save power consumption for starting and stopping the mobile device, only a certain number of displacement devices may be started. The number of the displacement devices is determined according to the length of the rolled piece. Specifically, the length of the rolled piece is obtained from the pre-bending displacement data, and then a certain number of displacement devices are selected from the displacement devices arranged in a row, so that the arrangement length of the plurality of displacement devices is the same as the length of the rolled piece, and the plurality of displacement devices are arranged to be parallel to the rolled piece. Therefore, the displacement device positioned outside the length of the rolled piece does not need to be started, and the energy consumption is further saved. Furthermore, the head end of the rolled piece in the transmission direction is set to move to the first displacement device, and the head end of the rolled piece is parallel to the displacement device. Thus, when the length of the rolled stock is less than the length of the displacement devices arranged in a row, only the displacement device corresponding to the rolled stock can be activated.
In order to facilitate calculation of the travel time for the moving device, the moving device is set to contact the rolled piece after the rolled piece has moved to the position of the moving device. At this time, the moving distance of the moving means is only the pre-bending displacement. To determine the moving time of the plurality of moving devices, the maximum pre-bending displacement is selected from the pre-bending displacements, i.e. the maximum pre-bending displacement y is selected from the pre-bending displacements calculated by the formulamax. This maximum pre-bend displacement is the maximum distance that a single moving means needs to move. Assuming that the moving means corresponding to the maximum pre-bending displacement moves at the maximum speed V, the time taken for the moving means to reach the maximum pre-bending displacement is the reference time. The calculation formula of the reference time is as follows: y ═ Tmax/V。
And on the basis of the reference time, calculating the corresponding moving speed of other moving devices through the pre-bending displacement of the other moving devices respectively, further determining the moving speed of each moving device, and finally controlling all the moving devices to stop moving at the same time.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a rolled piece pre-bending control device provided by the embodiment of the invention. As can be seen from fig. 3, the rolled piece pre-bending control device provided by the embodiment of the invention comprises a plurality of displacement devices 1, and the plurality of displacement devices 1 are arranged in a row. The arrangement direction of the displacement devices 1 is parallel to the conveying direction of the roller bed 2. The rolled piece pre-bending control device provided by the embodiment of the invention further comprises a calculation unit 3 and a control unit 4, wherein the calculation unit 3 is used for establishing a rolled piece pre-bending model; the control unit 4 is used for controlling the displacement device 1 to move. Further, the rolled piece pre-bending control device also comprises a frequency converter 5 for controlling the moving speed of the displacement device 1, and the frequency converter 5 is electrically connected with the control unit 4. In the rolled piece pre-bending control device provided by the embodiment of the invention, the displacement device 1 is a moving trolley or other moving components.
The working process of the rolled piece pre-bending control device provided by the embodiment of the invention is as follows:
before the rolled piece 6 is transmitted to the roller table 2, the calculation unit 3 establishes a rolled piece pre-bending model according to the material and the structure of the section steel, and selects the rolled piece pre-bending model according to the material and the structure of the section steel produced at this time. When the rolled piece 6 is transmitted on the roller way 2, the control unit 4 controls the rolled piece 6 to stop transmission when the rolled piece 6 is transmitted to the displacement device 1. The calculation unit 3 determines the distance that each displacement device 1 needs to move after contacting the rolled piece 6 according to the pre-bending displacement in the rolled piece pre-bending model, further determines the moving time, namely the reference time, according to the maximum distance and the maximum moving speed, and then determines the moving speed of each displacement device 1. The control unit 4 transmits the moving speed determined by each displacement device 1 to the frequency converter 5, and then controls each displacement device 1 to move simultaneously on the basis of the pre-bending displacement determined by each displacement device 1. When the time during which the displacement devices 1 are moved reaches the reference time, the control unit 4 controls all the displacement devices 1 to stop moving, thereby achieving the overall pre-bending by the sectional pre-bending of the rolled material 6.
The method for controlling the pre-bending of the rolled piece provided by the embodiment of the invention has the advantages of perfect algorithm, simple and stable control, thereby accurately controlling the pre-bending of different parts of the rolled piece and further keeping the rolled piece straight after being cooled. The rolled piece pre-bending control structure provided by the embodiment of the invention is simple, and the rolled piece pre-bending can be realized on the basis of the control method.
Those skilled in the art will readily appreciate that the techniques of the embodiments of the present invention may be implemented as software plus a required general purpose hardware platform. Based on such understanding, the technical solutions in the embodiments of the present invention may be essentially or partially implemented in the form of a software product, which may be stored in a storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (7)
1. A rolled piece pre-bending control method is characterized by comprising the following steps:
establishing a rolled piece pre-bending model, wherein the establishing of the rolled piece pre-bending model comprises the following steps:
determining a position-temperature change curve according to the cross section shape of a rolled piece and the material of the rolled piece;
determining bending displacement of different parts of the rolled piece according to the position-temperature change curve;
determining pre-bending displacement according to the bending displacement;
the rolled piece pre-bending model comprises pre-bending displacement of different parts in the length direction of the rolled piece, and the calculation formula of the pre-bending displacement is as follows:in the formula, y is pre-bending displacement and is along the pushing direction of the displacement device; x is the position of the roller way where the displacement device is located and is along the direction of the roller way; a is the elbow length of a rolled piece; b is the bent tail length of the rolled piece; l-a-b is the length of the middle section; l is the total length of the rolled piece; k is the elbow coefficient; t is a tail bending coefficient; m is a steel pushing stroke; the pre-bending displacement is untreated after the rolled piece is cooledBending displacement;
after the rolled piece stops being transmitted, controlling a plurality of displacement devices to move towards the rolled piece direction according to the pre-bending displacement and different speeds, and controlling the plurality of displacement devices to start and stop simultaneously;
the method further comprises the following steps:
acquiring the length of the rolled piece;
matching the displacement device according to the length of the rolled piece;
and when the rolled piece stops transmission, controlling the arrangement length of the plurality of displacement devices to be the same as the length of the rolled piece, and arranging the plurality of displacement devices to be parallel to the rolled piece.
2. The rolled stock prebending control method of claim 1, wherein the controlling the plurality of displacement devices to stop simultaneously comprises:
screening the maximum pre-bending displacement;
the displacement device corresponding to the maximum pre-bending displacement moves at the maximum speed, and the time taken by the displacement device is the reference time of the plurality of displacement devices;
and when the moving time of the displacement devices reaches the reference time, controlling the plurality of displacement devices to stop simultaneously.
3. A product pre-bending control method in accordance with claim 1, wherein a plurality of said displacement devices are arranged in a direction parallel to a direction of transport of the product, and a length of the plurality of said displacement devices after arrangement is greater than a length of the product.
4. A rolled piece pre-bending control device is characterized by comprising a displacement device positioned on one side of a roller way; the arrangement direction of the displacement devices is parallel to the transmission direction of the roller way;
the device further comprises:
a calculation unit for establishing a pre-bending model of the rolled piece and calculating pre-bending displacement according to the pre-bending model of the rolled piece, wherein the calculation formula is
In the formula, y is pre-bending displacement and is along the pushing direction of the displacement device; x is the position of the roller way where the displacement device is located and is along the direction of the roller way; a is the elbow length of a rolled piece; b is the bent tail length of the rolled piece; l-a-b is the length of the middle section; l is the total length of the rolled piece; k is the elbow coefficient; t is a tail bending coefficient; m is a steel pushing stroke;
the control unit is used for controlling the displacement devices to move towards the rolled piece direction according to the pre-bending displacement and different speeds, and controlling the plurality of displacement devices to be started and stopped simultaneously;
the control unit is also used for acquiring the length of the rolled piece;
matching the displacement device according to the length of the rolled piece;
and when the rolled piece stops transmission, controlling the arrangement length of the plurality of displacement devices to be the same as the length of the rolled piece, and arranging the plurality of displacement devices to be parallel to the rolled piece.
5. The rolled stock pre-bending control apparatus of claim 4, wherein the computing unit is further configured to select a rolled stock pre-bending model based on the current production profile.
6. The product pre-bow control device of claim 4, wherein the control unit is further configured to control a head end in the product movement direction to be parallel to a first one of the displacement devices when the product is stopped from being transported.
7. The rolled stock pre-bending control device according to any one of claims 4-6, characterized in that the displacement device is a travelling trolley.
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| CN111957749B (en) * | 2020-08-11 | 2022-07-29 | 中冶东方工程技术有限公司 | Intelligent control method for pre-bending of section steel and section steel cooling bed applying intelligent control method |
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