TW201805080A - Tapered-shape determining method and passage schedule setting method - Google Patents

Abstract

This method for determining a taper shape of an intermediate roll (10) in a six-stage rolling mill (1) equipped with an intermediate roll shift mechanism (2) comprises: an input step for inputting conditions, other than those for the taper shape, which are necessary for determining a shape control region indicating a range in which shape control can be performed on a rolled material (8); and a determination step for determining the taper shape so that the shape control region includes the origin of a two-dimensional plane of coordinates both under a first condition where a load exerted per unit width of the rolled material (8) is minimized, and under a second condition where the load exerted per unit width is maximized.

Description

Method for determining cone shape and path schedule setting method

The present invention relates to a method for determining a cone shape of an intermediate roll provided in a cold rolling mill and a method for setting a path schedule in a multi-stage rolling mill.

In cold rolling, multi-stage rolling mills (six-stage rolling mill, twelve-stage rolling mill, and twenty-stage rolling mill) having intermediate rolls have been widely used. A multi-stage rolling mill including an intermediate roll includes at least a pair of work rolls that sandwich a rolled material (for example, a metal strip) as a rolling target in a thickness direction thereof, and a pair of intermediate rolls each provided in the pair. Behind the work roll; a pair of support rolls through which the work roll is supported. Since the work roll system is deflected by the deformation resistance of the rolled material, the multi-stage rolling mill is provided with various shape control mechanisms (shape control means) for controlling the shape of the sheet after rolling.

In cold rolling, the following methods are generally used: at the beginning of rolling, the shape detectors such as the roll bending mechanism and the roll moving mechanism are initially set, and a shape detector provided at the exit side of the rolling mill is used. The shape of the rolled material during rolling is measured, and the control amount of the shape control mechanism is corrected based on the measurement result.

In the shape of the rolled sheet, not only the ear extension (in the rolling direction, the end of the plate is longer than the center of the sheet), the middle extension (in the rolling direction, the center is longer than the end of the plate) Longer) and other simple shape defects, it also has a composite extension by a quarter extension (Quarter) and various extensions. Therefore, the rolled shape is preferably evaluated at a plurality of positions in the sheet width direction. Specifically, generally, the following control is performed: the rolling shape is evaluated based on the elongation difference with respect to the plate width center of the plate end portion and the quarter portion, and the elongation difference is set to a target value. Way to control the shape. Furthermore, the quarter portion means a portion between the center of the thin plate and the end portion of the plate in the plate width direction.

In a multi-stage rolling mill such as a six-stage rolling mill, a twelve-stage rolling mill, and a twenty-stage rolling mill, an intermediate roll moving mechanism is used as a shape control mechanism, and it is arranged at one end of one side. Or the middle roller of the multi-stage cone moves in the axial direction. The intermediate roll moving mechanism moves the cone portion by moving the intermediate roll in the axial direction, thereby changing the contact load distribution of the intermediate roll, the work roll, and the backup roll, and controlling the shape of the sheet after rolling. Next, if the cone shape (cone angle, cone length) of the intermediate roller is optimized, it is performed by combining shape control mechanisms such as the intermediate roller moving mechanism and roller bending mechanism, and by using a high-precision shape control system. Shape control can effectively perform shape control and obtain a good rolled shape. However, generally, the cone shape of the intermediate roll is determined based on experience and trial-and-error methods, and because the cone shape is not optimized, a good rolled shape cannot be obtained.

Here, for example, a method is described in Patent Document 1, which uses a numerical analysis module to predict a rolled shape and makes the predicted shape as close as possible to a target shape. In detail, there is described a method for approximating the shape of an intermediate roll of a multi-stage rolling mill by a function including an unknown power to a power of 4 or more, and determining an unknown number representing the shape of the intermediate roll using a least square method.

However, it is difficult to change the shape of the intermediate roll in accordance with the plate width, plate thickness, material, etc. of the rolled material each time in terms of production management. Therefore, at the manufacturing site, it is preferable to use intermediate rolls of the same shape and to roll under a wide range of rolling conditions. Among the intermediate rolls whose shape has been optimized by the method described in Patent Document 1, it is difficult to obtain a good rolled shape under the entire rolling conditions as the target of the intermediate roll by using the intermediate roll of the same shape.

In order to solve such a problem, Patent Document 2 proposes a method that, while performing numerical analysis of shape prediction, defines a shape evaluation function and determines a cone shape of an intermediate roll for a multi-stage rolling mill, so that even in a standard rolling path A good rolled shape can also be obtained outside the schedule.

[Prior Art Documents] [Patent Documents] [Patent Documents 1] Japanese Published Patent Gazette "Japanese Patent Publication No. 62-142012 (published on June 25, 1987)" [Patent Document 2] Japanese Published Patent Gazette "Special Kaiping No. 6-39414 (published on February 15, 1994) "

[Summary of the Invention] [Problems to be Solved by the Invention] If the intermediate roll determined by the method described in Patent Document 2 is used, since the intermediate roll having the determined cone shape is used, it can be expanded to obtain good rolling. Range of shape rolling conditions. However, even if an intermediate roll having a tapered shape determined by the method described in Patent Document 2 is used, there is a limit to the range of rolling conditions that can be supported, so that a good rolled shape may not be obtained.

The present invention is conceived in view of the conventional problems described above, and an object of the present invention is to provide a method for determining rolling conditions (especially intermediate rolls) capable of obtaining a good rolling shape of a plurality of types of rolled materials as rolling targets. Cone shape).

[Means for Solving the Problems] The cone shape determination method of the present invention includes a shape control mechanism that controls a plurality of types of rolled shapes of rolling materials to be rolled, and is a cold rolling mill as an example of the shape control mechanism. Is provided with an intermediate roll moving mechanism for moving an intermediate roll including a cone shape at one end portion toward the axial direction of the intermediate roll, and the method for determining the shape of the cone is to determine the intermediate roll included in the cold rolling mill. The method of the cone shape includes an input step of using the difference between the elongation of the widthwise end of the rolled material and the elongation of the widthwise center as the x-coordinate, and making it closer to the end. The difference between the elongation of the middle portion of the center and the elongation of the center is used as the y-coordinate to form a two-dimensional coordinate plane, and in the two-dimensional coordinate plane, a plurality of types of the shape control mechanisms are operated. , To input conditions other than the cone shape used to determine the shape control region in which the shape controllable range of the rolled material is displayed; a determination step, in When the rolled material having the maximum width in the aforementioned intermediate roll width range is used as a shape control object, the unit width load of the rolled material is minimized as the first condition, and the rolled material having the smallest width in the aforementioned width range is used as the first condition. When it is a shape control object, the second unit width load is maximized as the second condition, and the first and second conditions are determined so that the shape control region includes the origin of the two-dimensional coordinate plane. The aforementioned cone shape.

The route schedule setting method of the present invention is a route schedule setting method of a multi-stage cold rolling mill that implements multiple routes, and includes a cold rolling mill that executes a final route, and is provided with control of rolling materials as rolling targets. A plurality of types of shape control mechanisms for rolling shapes. As an example of the shape control mechanism, an intermediate roller moving mechanism for moving an intermediate roller including a cone shape at one end portion toward the axial direction of the intermediate roller is provided. In the selection step, the difference between the elongation of the widthwise end of the rolled material and the elongation of the widthwise center in the cold rolling mill having the aforementioned final path is taken as the x-coordinate, and it is closer to the center than the end. The difference between the elongation of the middle part and the elongation of the center is used as the y-coordinate to form a two-dimensional coordinate plane, and in the two-dimensional coordinate plane, a plurality of types of the aforementioned shape control mechanisms are operated to The range of the unit width load is selected in such a way that the shape control area showing the shape controllable range of the rolled material includes the origin; setting steps Manner so that the final path of the rolling mill having the unit width load is contained within the width of the selected load range of the selected unit step to set the multi-stage cold rolling mills at least one of the rolling conditions.

[Effects of the Invention] According to one aspect of the present invention, it is possible to determine rolling conditions for obtaining a good rolling shape of a plurality of types of rolled materials.

[Mode for Carrying Out the Invention] [Embodiment 1] Hereinafter, Embodiment 1 of the present invention will be described based on Figs. 1 to 5 as follows. In addition, the following description is only for easier understanding of the idea of the invention, and the invention is not limited thereto unless otherwise specified, and in the present specification, "A to B" means "A to B".

In the following description, in order to make it easier to understand the cone shape determination method according to one aspect of the present invention, first, the outline of a six-stage rolling mill as an example of the applicable object of the cone shape determination method will be described. After briefly describing the knowledge of the present invention, the method for determining the cone shape will be described in detail.

(Schematic configuration of a six-stage rolling mill) FIG. 1 is a schematic diagram showing a configuration of a six-stage rolling mill 1 (cold rolling mill) which is an example of an application object of a cone shape determination method according to Embodiment 1 of the present invention. The six-stage rolling mill 1 is a cold rolling mill that cold-rolls rolling materials 8. The six-stage rolling mill 1 may be a rolling mill having a final path in a rolling system in which a plurality of rolling mills are continuously disposed, or a single rolling mill that implements a plurality of paths including a final path. The rolled material 8 is, for example, a metal strip such as a steel strip. The rolled material 8 may be a resin material.

As shown in FIG. 1, the six-stage rolling mill 1 is provided with a pair of work rolls 9 that sandwich the rolled material 8 in the thickness direction thereof, and a pair of support rolls 11 that each pair of work rolls 9 face each other. Press in the direction; a pair of intermediate rolls 10 are arranged between the work roll 9 and the support roll 11 and support the work roll 9. The intermediate roller 10 has a tapered shape at one end. In FIG. 1, the vertical direction of these rollers with respect to the paper surface is the long side direction, and the rolled material 8 is moved from the right side to the left side on the paper surface and is rolled.

The six-stage rolling mill 1 includes an intermediate roll moving mechanism 2, an intermediate roll bending mechanism 3, a differential load generating device 4, a shape detector 7, and a program computer 6. Here, the intermediate roll moving mechanism 2, the intermediate roll bending mechanism 3, and the differential load generating device 4 are shape control mechanisms for controlling the shape of the sheet after rolling. The six-stage rolling mill 1 is provided with a plurality of types of shape control mechanisms, and may include an intermediate roll moving mechanism 2 as one of them.

The intermediate roller moving mechanism 2 moves the intermediate roller 10 in the axial direction and moves the cone portion of the intermediate roller 10 to thereby distribute the contact load of the intermediate roller 10, the work roller 9, and the support roller 11. Change while controlling the shape of the sheet after rolling.

The intermediate roll bending mechanism 3 applies force to the intermediate roll 10 to bend the intermediate roll 10 in the thickness direction of the rolled material 8.

The differential load generating device 4 generates a differential load, which is used to control the asymmetry of the load in the longitudinal direction of the support roller 11.

The shape detector 7 is a device that detects the shape of the rolled material 8 after rolling, and outputs a signal indicating the detection result to the program computer 6.

The program computer 6 controls the intermediate roller moving mechanism 2, the intermediate roller bending mechanism 3, and the differential load generating device 4 based on the output signal of the shape detector 7.

The six-stage rolling mill 1 is a host computer 5 including a control program computer 6. The host computer 5 includes a display section 5a that displays control parameters and the like, and an input section 5b that receives an input for changing a control parameter.

(Brief description of invention knowledge) In a general rolling mill, a thin plate after cold rolling produces a composite extension composed of various extensions such as ear extension, middle extension, and quarter extension. Therefore, generally speaking, the rolling shape is evaluated by the elongation difference with respect to the plate width center of the plate end portion and the quarter portion, and the rolling is controlled so that each elongation difference becomes a target value.制 形。 System shape. A good rolled shape means that the difference in elongation with respect to the center of the plate width of the plate end portion and the quarter portion is small, and the plate shape is flat.

Among the factors affecting the rolling shape, there are external factors such as plate thickness, material, lubrication status, rolling load, and the control amount of shape control mechanisms such as intermediate roll bending mechanism, work roll bending mechanism, and intermediate roll moving mechanism. Plate thickness is an important quality item, usually controlled by automatic plate thickness control to make it almost a constant value. Although the material shape and lubrication state affect the rolling shape, most of the effects are caused by changes in rolling load and roll deflection. Therefore, the main cause of the shape change during rolling is the rolling load and the control amount of the shape control mechanism.

That is, when the same rolling mill is used, under a certain rolling condition, the controllable range of the rolling shape is determined based on the control amount range of the shape control mechanism mounted on the rolling mill.

The controllable range of the rolled shape can be visually represented using a shape control plane (shape control region) as shown in FIG. 2. The shape control plane will be described below.

The difference (εe) between the elongation at the end in the width direction of the rolled material and the elongation at the center in the width direction is considered as the x-coordinate, and the middle portion (quarter) closer to the center than the end portion The difference (εq) between the elongation at the center and the elongation at the center is used as the y-coordinate to form a two-dimensional coordinate plane. For simplicity, the difference in elongation (elongation difference) is expressed in units of 10 ^-5 .

Next, in the two-dimensional coordinate plane, points obtained by combining the control amount of each shape control mechanism at the maximum value and the minimum value are plotted. The drawing is based on an existing analysis module, and can be obtained by inputting necessary parameters for calculation in the calculation. For example, for a rolling mill having an intermediate roll moving mechanism and an intermediate roll bending mechanism as a shape control mechanism, the maximum and minimum values of the control amount in the intermediate roll moving mechanism and the intermediate roll bending mechanism are basically set. The four points that can be combined (x-coordinate: difference in elongation at the end of the plate εe; y-coordinate: difference in elongation at one-quarter of the portion εq). The four corners that can be combined form the shape control plane. The shape control plane shows a controllable range of the shape of the rolled material 8 by operating a plurality of shape control mechanisms. However, as will be described later, the shape control plane is not determined only by the control amount range of the shape control mechanism. Other rolling conditions also affect the shape and position of the shape control plane.

By evaluating whether the shape control plane includes the origin, that is, whether the point with the difference between the end of the plate and the center of the quarter width of the plate is zero, it is possible to evaluate whether a shape control mechanism is included. And the possibility of obtaining a good rolled shape. That is, when the shape control plane does not include the origin, even if a high-precision shape control system is used, a good rolled shape cannot be obtained. On the other hand, when the shape control plane includes the origin, a good rolled shape can be obtained by using a high-precision shape control system.

In one aspect of the present invention, in order to obtain rolling conditions capable of obtaining a good rolling shape, the shape control plane is used. The reason for using the shape control plane will be described below.

When the intermediate roll determined by the conventional method is used to roll a plurality of types of rolled materials to be rolled, the rolling conditions (plate width, rolling load) vary depending on the rolled material, and there is also a failure to obtain good rolling. The shape of the system.

The present inventors have conducted various investigations and studies on a rolling condition (in particular, a cone shape of an intermediate roll) for determining a rolling condition capable of obtaining a good rolling shape of a plurality of types of rolling materials to be rolled. As a result, under the influence of the rolling shape due to the plate width and the unit width load, it was clearly found that: (i) the wider the plate width and the smaller the unit width load, the shape control plane extends toward the middle and W-shape. (Ii) When the board width is narrower and the load per unit width is larger, the shape control plane is moved in the direction in which the ears extend and the quarters extend. Here, the unit width load refers to a load value of a unit width obtained by dividing a plate width by a rolling load.

This will be described using (a) and (b) of FIG. 2. (A) is a figure which shows the influence of the width of a rolled material plate on a shape control plane, (b) is a figure which shows the influence of a unit width load on a shape control plane. Here, the board end refers to a position from the board end to 50 mm, and the quarter part refers to a position at a distance of 70% from the center of the board width to the board end.

As shown in FIG. 2 (a), the sheet width of the rolled material was changed to 850, 950, and 1050 mm, and the shape control plane in each case was obtained by calculation. As a result, the wider the board width, the x-coordinate system of the shape control plane moves in the negative direction (the middle portion extends) and the y-coordinate system moves in the negative direction (the W-shaped extension direction). On the other hand, the narrower the board width, the x-coordinate system of the shape control plane moves in the positive direction (the ear portion extends) and the y-coordinate system moves in the positive direction (the quarter portion extension direction).

As shown in FIG. 2 (b), the unit width load was changed to 3.46, 4.17, and 4.84 kN / mm, and the shape control plane in each case was obtained by calculation. As a result, the smaller the unit width load, the x-coordinate system of the shape control plane moves in the negative direction (the middle portion extends) and the y-coordinate system moves in the negative direction (the W-shaped extension direction). On the other hand, as the load per unit width becomes larger, the x-coordinate system of the shape control plane moves in the positive direction (the ear portion extends) and the y-coordinate system moves in the positive direction (the quarter portion extension direction).

In this way, the present inventors have found that the position of the shape control plane formed on the above-mentioned two-dimensional coordinate plane and the main cause of the shape change are set on the premise of setting each control amount range of the plurality of shape control mechanisms provided in the rolling mill. It is the cone shape (cone angle, cone length), plate width, and unit width load of the middle roller. Even if the rolling conditions such as the material, sheet thickness, and tension of the rolled material are changed, as long as the same unit width load, the shape control plane will not change much.

From these points of view, the inventors have further obtained the following technical ideas: under the condition that the unit width load of the final path is minimized under the maximum plate width in the range of the plate width as the intermediate roll object, and at the minimum plate width Under the condition that the unit width load of the final path is maximized, the shape of the cone is set so that the shape control plane includes the origin. The shape control plane is easy to include the origin in the entirety of the manufacturing type of the intermediate roller object. , And can obtain a good rolled shape.

In other words, I found that in the two-dimensional coordinate plane shown in FIG. 2, based on the plate width range and various rolling conditions as the target of the intermediate roll, the shape control plane was calculated, and the shape control plane was directed to the lower left. In the two conditions of moving and moving to the upper right, if a cone shape including the origin is included in the shape control plane, it is possible to obtain a good rolled shape of a plurality of types of rolled materials to be rolled.

(Configuration of Host Computer) Based on the knowledge of the present invention described above, a specific example of a method for determining a cone shape will be described below. In the present embodiment, as an example of the present invention, a method for determining a good rolling shape of a plurality of types of rolled materials to be rolled is shown by using the upper computer 5 included in the six-stage rolling mill. The computer used to determine the shape of the cone may be any computer provided with a program for determining the shape control plane, and a computer different from the host computer 5 (for example, a personal computer) may be used.

The configuration of the host computer 5 will be described based on FIG. 3. FIG. 3 is a block diagram showing a schematic configuration of a host computer 5 included in the six-stage rolling mill 1 according to this embodiment. In addition to the matters described here, the host computer 5 has various functions for controlling rolling and the like.

As shown in FIG. 3, the host computer 5 includes a control unit 20, a storage unit 30, and an output unit 40. In the host computer 5, the input unit 5b (for example, a mouse and a keyboard), the display unit 5a (for example, a display device such as a liquid crystal display), and the program computer 6 are connected.

The control unit 20 includes a shape control plane determination unit 21, a display control unit 22, and a unit width load calculation unit 23. The storage unit 30 stores rolling parameters 31, a shape control plane determination program 32, and a unit width load calculation program 33.

The control unit 20 controls the overall operation of the host computer 5 and is, for example, a CPU (Central Processing Unit). Each part of the control unit 20 can be implemented as software that operates by a CPU.

The detailed description of the shape control plane determination unit 21, the display control unit 22, and the unit width load calculation unit 23 in the control unit 20 will be described later together with an example of a process for determining the shape of the cone performed by the host computer 5, which will be described later. Be explained.

The storage section 30 is a non-volatile storage device (eg, a hard disk, a flash memory) that can store various data used in the control section 20.

The rolling parameters 31 are data input through the input unit 5b. This rolling parameter 31 may be a rolling condition of the six-stage rolling mill 1 alone, or may be a rolling condition for determining a route schedule of a tandem rolling mill including the six-stage rolling mill 1. The rolling parameters 31 are used for calculation of the unit width load of the unit width load calculation unit 23 and calculation by the shape control plane determination unit 21.

The shape control plane determination program 32 is used for calculation by the shape control plane determination unit 21, and the unit width load calculation program 33 is used for calculation of the unit width load of the unit width load calculation unit 23. The shape control plane determination program 32 and the unit width load calculation program 33 can use existing programs, for example, an analysis module constructed by a rolling mill manufacturer or the like can be used.

The output unit 40 outputs various commands from the control unit 20 to the program computer 6.

(Processing Flow for Determining Cone Shape) Next, a processing flow for determining the shape of the cone executed by the host computer 5 will be described using FIG. 4. FIG. 4 is a flowchart showing an example of a processing flow for determining the shape of the cone executed by the host computer 5.

As shown in FIG. 4, first, the input unit 5b receives input of various data (other than the cone shape) from the user (step 11; hereinafter simply referred to as S11) (input step, first step). The control unit 20 stores the inputted various data in the storage unit 30 as the rolling parameters 31. Rolling parameters 31 include parameters as rolling conditions. For example, they include the thickness of the master plate, the thickness of the finished product (product thickness), the width of the plate, the material of the rolled material (deformation resistance), the roll diameter, and the roll material. Parameters such as friction coefficient and tension between stands. Next, the rolling parameter 31 includes data showing a plate width range of a plurality of types of rolled materials to be processed by the intermediate roll 10.

Next, the unit width load calculation unit 23 reads the rolling parameters 31 and the unit width load calculation formula 33 from the storage unit 30, and calculates the maximum unit width load and the minimum unit width load of the six-stage rolling mill 1 (S12). This maximum unit width load is obtained by dividing the maximum load in the range of loads predicted from the input rolling conditions (rolling parameter 31) by the smallest plate width among the plate widths of the plurality of types of rolled materials to be processed by the intermediate roll 10. Time, the value obtained. The minimum unit load is a value obtained when the minimum load in the load range is divided by the largest plate width in the plurality of types of rolled materials.

After that, the input unit 5b receives input from the user of the values (cone angle, cone length) of the cone shape of the intermediate roll 10 (S13: second step). As for the numerical value for displaying the aforementioned cone shape, any one having a cone shape in a plurality of types of intermediate rollers 10 usable by a user can be input and displayed. In addition, as a result of numerical analysis of shape prediction using an existing program, it is possible to input and display a numerical value of the cone shape after the user judges, and this is preferable. Furthermore, in the case of a multi-stage cone, it is also possible to input each cone angle and each cone length.

Next, the shape control plane determination unit 21 uses the numerical values showing the rolling parameters 31 and the cone shape of the intermediate roll 10 and the maximum unit width load and the minimum unit width load calculated by the unit width load calculation unit 23 to calculate In the following first and second conditions, a drawing for creating a shape control plane (S14). That is, the first condition refers to a condition in which a rolled material 8 having a maximum width plate width in a width range preset for the intermediate roll 10 is used as a shape control object, and a unit width load of the rolled material 8 is minimized. . The second condition refers to a condition that a rolled material 8 having a minimum width plate width in a width range preset for the intermediate roll 10 is used as a shape control object, and a unit width load of the rolled material 8 is maximized.

The shape control plane determination unit 21 calculates four points defining the shape control surface for each of the first condition and the second condition. Next, the display control unit 22 uses the coordinates of the four points calculated by the shape control plane determination unit 21 to generate an image showing the shape control plane for each of the first condition and the second condition, and displays the image on the display. Section 5a (S15). In other words, the values entered in the first and second steps are used to determine the respective shape control planes in the first and second conditions (third step).

Next, for the first condition and the second condition, the user determines whether or not the shape control planes displayed on the display section 5a include the origin of the two-dimensional coordinate (S16).

In the case where the shape control plane of at least one of the first and second conditions does not include the origin of the quadratic coordinate (NO at S16), the user will display the value of the cone shape of the intermediate roller 10 (cone Angle, cone length) are input to the input section 5b, and the processes of S13 to S16 are repeated.

In the case where the shape control plane of any of the first and second conditions includes the origin of the two-dimensional coordinate (YES at S16), the value showing the cone shape of the intermediate roller 10 at this time is adopted. In other words, the cone shape of the intermediate roller 10 is determined (determination step).

As described above, the cone shape determination method in this embodiment is a method of determining the cone shape of the intermediate roll 10 included in the six-stage rolling mill 1 as a cold rolling mill. The six-stage rolling mill 1 is a shape control mechanism that controls the rolling shape of the rolling material to be rolled, and is provided with (i) an intermediate roll moving mechanism 2 that includes a cone-shaped intermediate roll at one end portion. 10 moves in the direction of its axis; and (ii) the intermediate roller bending mechanism 3.

Here, the difference between the elongation of the end of the rolled material in the width direction and the elongation of the center in the width direction is taken as the x-coordinate, and the elongation of the middle portion closer to the center than the end portion and the center The difference between the two elongations is used as the y-coordinate to form a two-dimensional coordinate plane, and in the aforementioned two-dimensional coordinate plane, the intermediate roll moving mechanism 2 and the intermediate roll bending mechanism 3 are operated to display the aforementioned rolled material. The area of the shape controllable range is used as the shape control area.

The method for determining the shape of the cone in this embodiment includes: (i) a first step of inputting and displaying a numerical value for determining a rolling condition for the shape control region; (ii) a second step of inputting and displaying the cone of the intermediate roll 10 The value of the body shape; (iii) the third step, using the values entered in the first step and the second step to determine the respective shape control planes in the first and second conditions; and the first and second conditions The two conditions are: (a) the condition that the unit width load of the rolled material becomes the smallest when a rolled material having a plate width of the largest width in the width range preset for the intermediate roll 10 is used as the shape control object; (b) When a rolled material having a plate width having a minimum width in the width range preset for the intermediate roll 10 is used as a shape control object, the unit width load becomes the maximum condition.

Next, the user repeats the first step while changing the numerical value of the cone shape input in the second step so that the shape control regions determined in the third step include the two-dimensional coordinate plane. Second step and third step.

According to the above configuration, it is possible to determine the shape of the intermediate roll cone that can obtain a good rolling shape of a plurality of types of rolled materials to be rolled.

In this embodiment, a six-stage rolling mill having an intermediate roll moving mechanism and an intermediate roll bending mechanism as shape control mechanisms will be described as an object of the cone shape determination method according to one aspect of the present invention. However, it goes without saying that the present invention can be similarly applied to rolling mills other than a six-stage rolling mill such as a twelve-stage rolling mill and a twenty-stage rolling mill. The shape control mechanism may include a work roll bending mechanism as an alternative to the intermediate roll bending mechanism.

(Example) In the same six-stage rolling mill as the rolling mill used in the examination of FIG. 2, the intermediate roll 10 was used, and the target plate width range was set to 1050 mm to 1250 mm. In the case where the thickness is a steel strip of 0.8 mm to 2.0 mm, an example in which the cone shape determination method according to one aspect of the present invention is applied will be described.

Further, the plate end portion in the shape control plane was positioned 50 mm from the plate end, and the quarter portion was positioned at a distance of 70% from the center of the plate end to the plate end portion. In the first condition and the second condition, the cone condition is discussed so that the shape control plane includes the origin, and the cone condition is set to a cone length of 230 mm and a cone angle of 35/10000. Here, the first condition is that the plate width of the rolled material 8 is set to a maximum plate width of 1250 mm in the plate width range as the target of the intermediate roll 10, and the unit width load of the final path is a minimum value of 3.47 kN / mm; The second condition is that the plate width of the rolled material 8 is set to a minimum plate width of 1050 mm in the plate width range as the target of the intermediate roll 10, and the unit width load of the final path is a maximum value of 4.47 kN / mm.

As shown in FIG. 5 (a), in the condition that the cone length is 230 mm and the cone angle is 35/10000, both of the first condition and the second condition described above include the origin of the shape control plane. Furthermore, it was confirmed by numerical analysis of the shape prediction that the shape control plane includes the origin point in the entire manufacturing type that is the object of the intermediate roll 10 in the cone condition. The measurement result of the final path shape when the intermediate roll 10 is applied and rolled is shown in (b) of FIG. 5. From the shape detector data, the elongation differences εe and εq with respect to the plate end portion and the center of the quarter portion were calculated. εe and εq are both within the target value.

[Embodiment 2] Another embodiment of the present invention will be described below based on Figs. 6 to 9. The configuration other than the configuration described in this embodiment is the same as that in the first embodiment. In addition, for convenience of explanation, components having the same functions as those shown in the drawings of the first embodiment are denoted by the same reference numerals, and descriptions thereof are omitted.

In the method for determining the shape of the cone in the first embodiment, in the case where the shape control plane of either the first condition or the second condition includes the origin of the quadratic coordinate plane, the set intermediate roller 10 is used at this time. Cone shape. On the other hand, this embodiment has the following differences: Even if the shape of the cone is changed to various values, the shape control plane including the two-dimensional coordinate plane cannot be obtained in both the first condition and the second condition of the shape control plane. When the value of the point cone shape is set, the setting of the route schedule is corrected.

As an example of the method of this embodiment, the following method is considered: After determining that either of the first condition and the second condition has a cone shape including the origin of the plane of the two-dimensional coordinate, the first condition and The shape control plane of any of the second conditions is a range of the unit width load of the final path including the origin of the quadratic coordinate plane, and is corrected so that the unit width load of the final path is included in this range. The setting of the final route schedule.

In the first embodiment described above, for example, the six-stage rolling mill 1 provided as the final path of the rolling step is used, and the method of determining the shape of a cone in one aspect of the present invention will be described. Generally, a plurality of cold rolling mills are often arranged in a row, and a continuous cold rolling is used to continuously roll one rolled material. The schematic structure of this tandem rolling mill is demonstrated using FIG. FIG. 6 is a schematic diagram showing a configuration of a tandem rolling mill 50 as an example of an application target of a route scheduling setting method in Embodiment 2 of the present invention.

As shown in FIG. 6, the tandem rolling mill 50 (multi-stage cold rolling mill) includes a six-stage rolling mill 1 as a final path of the rolling step, and three sets of four-stage rolling mills 51. The number of four-stage rolling mills 51 is not limited to this. Of course, the tandem rolling mill 50 series may be not only the four-stage rolling mill 51, but also a multi-stage rolling mill with six or more stages or two stages. The rolling mill is not particularly limited. In FIG. 6, the rolled material 8 is rolled from the right side to the left side on the paper surface.

Each of the four-stage rolling mills 51 includes a pair of work rolls 51 a that sandwich the rolled material 8 in the thickness direction thereof, and a pair of support rolls 51 b that press the pair of work rolls 51 a in the opposite directions. Each of the four-stage rolling mills 51 uses a variety of sensors and computers (not shown) to highly control the roll gap and the speed of the rolls, and performs plate thickness control during rolling.

The tandem rolling mill 50 can reduce the thickness of the rolled material 8 in stages. In each rolling mill (roll stand) of the tandem rolling mill 50, the condition setting of "how much rolling load is applied to the rolling material 8 (whether the thickness is reduced or not)" is called a route schedule.

By changing the setting of the path schedule, the value of the unit width load as a rolling condition in the above-mentioned six-stage rolling mill 1 can be changed. Specifically, for example, by increasing the load per unit width in the three four-stage rolling mills 51 (increasing the difference between the thickness on the inlet side and the thickness on the exit side), the six-stage rolling mill 1 can be lowered. Load per unit width.

According to the route schedule setting method in the second embodiment of the present invention, even when the cone shape determination method in the first embodiment cannot be directly applied, rolling conditions for obtaining a good rolling shape of a plurality of types of rolled materials can be determined. . This point will be described in detail below.

In the method for determining the shape of the cone of the first embodiment, when the shape control planes of both the first condition and the second condition include the origin of the two-dimensional coordinate, the cone shape of the intermediate roller 10 at this time is used. . However, in the case where the board width range and the unit width load range are large, in the board width range as the object of the intermediate roll 10, under the first board condition, the unit width load of the final path is minimized under the first condition; And under the second condition that the unit width load of the final path becomes the maximum under the minimum plate width, there may be cases in which the cone condition that the shape control plane includes the origin is not obtained under both conditions.

Furthermore, even if it is possible to determine the cone condition that the shape control plane includes the origin of the two-dimensional coordinate in both of the first and second conditions described above, in the case of preventing the middle extension and the ear extension, A plurality of types of rolled materials (ranges between the maximum and minimum values of the plate width and the unit width load), which are the objects of the intermediate roll 10, may produce a quarter extension or a W-shaped extension.

The inventors have noticed that the rolling shape after the final path is almost determined by the rolling conditions of the final path, and because the rolling conditions of the paths so far have little influence, if the shape control plane of the final path includes the origin The way to set the path schedule can get a good rolled shape. That is, in the case as described above, the present inventors discovered new knowledge: after fixing the cone shape of the intermediate roll 10, for the width of the plate to be rolled, the shape control plane includes the unit width load of the origin The range of is made clear, and the path schedule is set so that the unit width load of the final path is included in the aforementioned range, and a good rolled shape can be easily obtained.

The range of this unit width load is demonstrated below using FIG. FIG. 7 is a diagram showing the range of the plate width of each target of the intermediate roll 10 such that the shape control plane includes the unit width load of the origin.

When the cone shape of the intermediate roll 10 is fixed, the plate width of the rolled material is fixed, and various rolling conditions are provided, the shape control plane can be drawn, for example, as shown in FIG. 2 (b). Next, at this time, the shape control plane is moved on the two-dimensional coordinate plane based on changing the unit width load which is one of the rolling conditions (see FIG. 2 (b)). In this way, by changing the unit width load, it is possible to determine the range of the unit width load in which the shape control plane includes the origin.

Specifically, for example, as shown in FIG. 7, when the plate width is set to 1050 mm, the range of the unit width load including the origin of the shape control plane can be determined in a range of about 2 kN / mm to 6 kN / mm. . In this way, it is possible to make the plate width that is the target of the intermediate roll 10 such that the range of the unit width load including the origin is included in the shape control plane.

When the plate width is narrow, the unit width load that makes the shape control plane containing the origin point becomes smaller, and when the plate width is large, the unit width load that makes the shape control plane contains the origin point becomes larger. In this way, for the width of the plate to be rolled, if the range of the unit width load of the shape control plane including the origin is clear, and the unit width load of the final route is included in the aforementioned range, the path is set. By scheduling, a good rolled shape can be obtained.

The setting of such a route schedule can be performed using the host computer 5 described in the first embodiment. Hereinafter, an example of a processing flow for setting a route schedule will be described using FIG. 8. FIG. 8 is a flowchart showing an example of a processing flow for setting a route schedule in the embodiment of the present invention.

As shown in FIG. 8, first, the input unit 5 b receives input from the user with a cone shape and a plate width (S21: first step). This cone shape is preferably a cone shape in which any one of the first condition and the second condition includes the origin of the quadratic coordinate plane. This makes it easy to obtain a range in which the unit width load of the shape control plane includes the origin, or to expand the range.

When input is made by the user, the unit width load calculation unit 23 reads the rolling parameters 31 and the unit width load calculation program 33 from the storage unit 30, and calculates the unit width load of the final path using the input board width information. The user can calculate a plurality of unit width loads in the unit width load calculation unit 23 by changing the input rolling parameters 31. In addition, the user may input a plurality of unit width loads considered to be better to the host computer 5 based on experience without using the unit width load calculation unit 23. That is, the unit width load calculation unit 23 inputs the calculated unit width load or the unit width load input by the user to the shape control plane determination unit 21 (second step).

Next, the shape control plane determination unit 21 uses the above-mentioned unit width load and other parameters to calculate a four-point coordinate for creating the shape control plane. The display control unit 22 uses this 4-point coordinate to generate an image that displays the shape control plane, and displays the image on the display unit 5a (third step). The user changes the value of the unit width load or the rolling parameter 31 input to the input unit while determining whether the displayed shape control plane includes the origin of the two-dimensional coordinate. Thereby, it is possible to select a range in which the unit width load including the origin is included in the shape control plane (S22) (selection step).

In this step S22, the upper limit value and the lower limit value of the unit width load including the origin of the shape control plane are obtained. You can also use any of the following methods: after inputting the maximum unit width load that can be given and analyzing it, reducing the input unit width load; after entering and analyzing the unit width load near zero, How to increase the input unit width load.

After that, the unit width load of the final path is included in the selected range, and then the path schedule is set (S23) (setting step). Specifically, by changing the rolling load of rolling mills other than the final path of the tandem rolling mill 50, the thickness of the rolling material 8 of the rolling mill entering the final path is changed, and as a result, the final path is rolled. The unit width load in the machine is included in the aforementioned range. The resetting of such a route schedule can be performed manually by a user or by using any program.

As described above, the method of setting the route schedule in this embodiment is a method of setting the route schedule of the tandem rolling mill 50 as a multi-stage cold rolling mill that executes a plurality of routes. The six-stage rolling mill 1 of the cold rolling mill that executes the final path is a shape control mechanism that controls the rolling shape of the rolling material to be rolled, and is provided with (i) an intermediate roll moving mechanism 2 that is provided at one end The intermediate roller 10 having a cone shape is moved toward the axial direction; and (ii) the intermediate roller bending mechanism 3.

Here, the difference between the elongation of the end of the rolled material in the width direction and the elongation of the center in the width direction is taken as the x-coordinate, and the elongation of the middle portion closer to the center than the end portion and the center The difference between the two elongations is used as the y-coordinate to form a two-dimensional coordinate plane, and in the aforementioned two-dimensional coordinate plane, the intermediate roll moving mechanism 2 and the intermediate roll bending mechanism 3 are operated to display the aforementioned rolled material. The area of the shape controllable range is used as the shape control area.

The final path determination method in this embodiment includes: (i) a first step of inputting and displaying a numerical value for determining a rolling condition for determining the shape control region, and inputting and displaying a value of the aforementioned cone shape; (ii) the first step In the second step, the unit width load of the six-stage rolling mill 1 that executes the final path is input; (iii) in the third step, the shape control region is determined using the values entered in the first and second steps.

The unit width load input in the second step is changed so that each shape control region determined in the third step includes the two-dimensional coordinate plane, and the second and third steps are repeated The upper limit value and the lower limit value of the unit width load are obtained so that the shape control region includes the origin of the two-dimensional coordinate plane.

Next, the method for setting the route schedule in this embodiment further includes a setting step so that the unit width load of the six-stage rolling mill 1 is included in the range defined by the upper limit value and the lower limit value. System to set at least one rolling condition of the tandem rolling mill 50.

According to the above configuration, even if the shape of the cone is changed to various values, and even if the shape control plane of the first condition and the second condition cannot obtain the value of the cone shape including the origin of the quadratic coordinate plane, A method of obtaining a good rolling shape of a plurality of types of rolled materials as rolling targets, and correcting the setting of the route schedule.

Furthermore, in this embodiment, although the tandem rolling mill 50 is described, the route scheduling method of one aspect of the present invention is also applicable to a reverse rolling mill, which uses a multi-stage rolling mill. The rolling machine rolls the rolled material back and forth to perform rolling.

(Example) In the same six-stage rolling mill as the rolling mill used in the examination of FIG. 7, the intermediate roll 10 was used, the target plate width range was set to 850 mm to 1050 mm, and the shape of the finished product was controlled. In the case where the thickness is 0.8 mm to 2.0 mm, a description will be given of an example to which the route scheduling method of one aspect of the present invention is applied.

Further, the plate end portion in the shape control plane was positioned 50 mm from the plate end, and the quarter portion was positioned at a distance of 70% from the center of the plate end to the plate end portion. Under the following conditions (at a maximum plate width of 1050 mm in the plate width range that is the target of the intermediate roll 10, the unit width load of the final path is a minimum value of 3.46 kN / mm; and in the plate width that is the target of the intermediate roll 10, Under the condition that the minimum plate width in the range is 850mm, the unit width load of the final path is a maximum of 4.84kN / mm), and the shape control plane includes the origin, and the cone is explored by numerical analysis of shape prediction Optimization of conditions. However, a cone condition that satisfies both conditions is not obtained. Therefore, only under the condition that the unit width load of the final path is the minimum under the maximum plate width, in order to include the origin in the shape control plane, the cone condition is set to a cone length of 330 mm and a cone angle of 35/10000. . As shown in Fig. 9 (a), under the condition that the cone length is 330mm and the cone angle is 35/10000, only the first condition that the unit width load of the final path becomes the minimum under the maximum plate width , Can make the shape control plane contain the origin. Next, a range of a unit width load in which the shape control plane includes the origin for each plate width that is an object of the intermediate roller 10 is determined. The graph showing this result is the aforementioned FIG. 7.

Next, the setting of the route schedule is corrected so that the unit width load of the final route is included in the aforementioned range. Specifically, by changing the rolling load of rolling mills other than the final path included in the tandem rolling mill 50, the unit width load in the rolling mill of the final path is included in the aforementioned range.

Comparing the shape measurement result of the final path when the intermediate roll 10 having the aforementioned cone shape is used for rolling, as compared with the case where the uncorrected path schedule is set after rolling, as shown in FIG. 9 (b). Show. From the shape detector data, the elongation differences εe and εq with respect to the plate end portion and the center of the quarter portion were calculated. Although εe and εq deviate from the target values when rolling is performed without setting the modified route schedule, both εe and εq are within the target value when the modified route schedule is set.

[Summary] A cone shape determination method according to one aspect of the present invention includes a shape control mechanism that controls a plurality of types of rolled shapes of the rolling material 8 as a rolling target, and is a cold rolling mill (as an example of the shape control mechanism) Six-stage rolling mill 1) is provided with an intermediate roll moving mechanism 2 for moving the intermediate roll 10 having a cone shape at one end portion toward the axial direction of the intermediate roll 10, and the method for determining the cone shape is determined The method for forming the cone shape of the intermediate roll 10 in the cold rolling mill includes an input step of calculating a difference between the elongation of the widthwise end of the rolled material 8 and the elongation of the widthwise center. As the x-coordinate, and the difference between the elongation of the middle part (quarter part) closer to the center than the aforementioned end and the elongation of the center as the y-coordinate to form a two-dimensional coordinate plane, and In the two-dimensional coordinate plane, a plurality of types of the shape control mechanisms are operated to input a shape control region (shape control plane) for determining a range in which the shape of the rolled material can be controlled. ) Conditions other than the aforementioned cone shape; a determining step of minimizing a unit width load of the rolled material 8 when the rolled material 8 having a maximum width in the width range of the intermediate roll 10 set in advance is used as a shape control object As a first condition, and when a rolled material having the smallest width in the aforementioned width range is used as a shape control object, the aforementioned unit width load is maximized as the second condition, and under the first condition and the second condition, the The shape control region (shape control plane) includes the origin of the two-dimensional coordinate plane to determine the shape of the cone.

According to the above configuration, it is possible to determine the shape of the intermediate roll cone that can obtain a good rolling shape of a plurality of types of rolled materials to be rolled.

In addition, the route schedule setting method according to one aspect of the present invention is a route schedule setting method of a multi-stage cold rolling mill (tandem rolling mill 50) that implements multiple routes, and includes a cold rolling mill that executes a final route ( A six-stage rolling mill 1) is provided with a shape control mechanism that controls a plurality of types of rolling shapes of the rolling material 8 as a rolling target, and as an example of the shape control mechanism, it is provided with an end portion on one side The intermediate roll moving mechanism 2 that moves the intermediate roll 10 including the cone shape toward the axial direction of the intermediate roll 10; the selection step involves the width of the rolled material 8 in the cold rolling mill (six-stage rolling mill 1) having the aforementioned final path. The difference between the elongation at the end in the direction and the elongation at the center in the width direction is taken as the x-coordinate, and the elongation at the middle portion (quarter portion) closer to the center than the end portion is equal to the elongation at the center. The difference between the two elongations is used as the y-coordinate to form a two-dimensional coordinate plane, and a plurality of types of the aforementioned shape control mechanisms are operated in the two-dimensional coordinate plane so that the shape of the rolled material 8 is displayed. The shape control area (shape control plane) of the control range includes the origin to select the range of unit width load; the setting step is to make the unit width in the cold rolling mill (six-stage rolling mill 1) with the aforementioned final path The rolling conditions of at least one of the multi-stage cold rolling mills are set such that the load is included in the range of the unit width load selected in the selection step.

According to the above-mentioned path scheduling setting method, even if the shape of the cone is changed to various values, the value of the shape of the cone that makes the shape control plane of both the first condition and the second condition include the origin of the two-dimensional coordinate cannot be obtained. In this case, the route schedule is set so that a good rolling shape of a plurality of types of rolled materials to be rolled can be obtained.

Therefore, it is possible to determine rolling conditions for obtaining a good rolling shape of a plurality of types of rolled materials.

1‧‧‧ six-level rolling mill
2‧‧‧ intermediate roller moving mechanism (shape control mechanism)
3‧‧‧Intermediate roller bending mechanism (shape control mechanism)
4‧‧‧ Differential load generating device
5‧‧‧ PC
5a‧‧‧Display
5b‧‧‧Input Department
6‧‧‧ Program Computer
7‧‧‧ Shape Detector
8‧‧‧ rolled material
9‧‧‧Working roller
10‧‧‧ Intermediate roller
11‧‧‧ support roller
20‧‧‧Control Department
21‧‧‧ Shape control plane decision unit
22‧‧‧Display Control Department
23‧‧‧Unit width load calculation unit
30‧‧‧Storage Department
31‧‧‧Rolling parameters
32‧‧‧ Shape control plane decision program
33‧‧‧Unit width load calculation program
40‧‧‧Output Department
50‧‧‧ Tandem rolling mill (multi-stage cold rolling mill)
S11 ~ S17, S21 ~ S23‧‧‧step

[FIG. 1] It is a schematic diagram which shows the structure of a six-stage rolling mill which is an example of the application object of the cone shape determination method in Embodiment 1 of this invention. [Fig. 2] (a) is a diagram showing the influence of the width of the rolled material on the shape control plane, and (b) is a diagram showing the influence of the unit width load on the shape control plane. [Fig. 3] A block diagram showing a schematic configuration of a host computer included in the six-stage rolling mill. [Fig. 4] It is a flowchart showing an example of a cone shape determination processing flow executed by the aforementioned host computer. [Fig. 5] (a) is a diagram showing a shape control plane under the following two conditions in the embodiment of the first embodiment of the present invention: in the range of the plate width as the object of the intermediate roller having the set cone shape, the largest The conditions under which the unit width load of the final path is minimized under the board width; and the conditions under which the unit width load of the final path is maximized under the minimum board width. (B) Drawing of rolled shape of rolled steel strip. [FIG. 6] A schematic diagram showing a configuration of a tandem rolling mill as an example of an application object of a method for setting a route schedule in Embodiment 2 of the present invention. [Fig. 7] It is a diagram showing a range of a unit width load for each plate width as an object of the intermediate roller, so that the shape control plane includes the origin. [Fig. 8] It is a schematic diagram showing an example of a process flow for setting a route schedule when a high-level computer included in the six-stage rolling mill according to the second embodiment of the present invention is executed. [Fig. 9] (a) is a diagram showing a shape control plane under the following two conditions in the second embodiment of the present invention: in the range of the plate width as the object of the intermediate roll having the set cone shape, the largest The conditions under which the unit width load of the final path is minimized under the board width; and the conditions under which the unit width load of the final path is maximized under the minimum board width. (B) Drawing of rolled shape of rolled steel strip.

S11 ~ S17‧‧‧step

Claims (2)

A method for determining a cone shape is provided with a shape control mechanism that controls a plurality of types of rolling shapes of rolling materials to be rolled, and a cold rolling mill as an example of the shape control mechanism includes an end portion on one side The intermediate roll moving mechanism that moves the intermediate roll including the cone shape toward the axial direction of the intermediate roll, and the method for determining the cone shape is a method for determining the cone shape of the intermediate roll included in the cold rolling mill. : In the input step, the difference between the elongation of the end of the rolled material in the width direction and the elongation of the center in the width direction is taken as the x-coordinate, and the elongation of the middle portion closer to the center than the end is compared with the foregoing. The difference between the elongation at the center is used as the y-coordinate to form a two-dimensional coordinate plane. In the two-dimensional coordinate plane, a plurality of types of the shape control mechanisms are operated to input and determine the display of the rolled material. The condition of the shape control range of the shape control region of the condition other than the aforementioned cone shape; When the rolled material having the largest width in the roll width range is used as the shape control object, the unit width load of the rolled material is minimized as the first condition, and when the rolled material having the smallest width in the width range is used as the shape control object, As the second condition, the unit width load is maximized, and under the first condition and the second condition, the shape of the cone is determined so that the shape control region includes the origin of the two-dimensional coordinate plane. A setting method, which is a method for setting a path schedule of a multi-stage cold rolling mill that implements multiple paths, and includes: a cold rolling mill that implements a final path, which is provided with a plurality of controls for controlling the rolling shape of a rolling material as a rolling target Type of shape control mechanism, and as an example of the shape control mechanism described above, it is provided with an intermediate roller moving mechanism that moves an intermediate roller having a cone shape at one end portion toward the axial direction of the intermediate roller; In the cold rolling mill having the aforementioned final path, the difference between the elongation of the widthwise end of the rolled material and the elongation of the widthwise center is taken as the x-coordinate, and the extension of the middle portion closer to the center than the end portion is extended. The difference between the elongation and the central elongation is used as the y-coordinate to form a two-dimensional coordinate plane, and in the two-dimensional coordinate plane, a plurality of types of the aforementioned shape control mechanisms are operated so that the aforementioned rolling is displayed. The shape control area of the shape of the material can be controlled to include the origin to select the range of unit width load; the setting step is to have Load per unit width of said cold rolling mill in the final path of the embodiment is contained within the width of the selected load range of the selected unit step to set the multi-stage cold rolling mills at least one of the rolling conditions.