JPH11147131A - Method for deciding leveling condition and leveling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of camber even after shearing a blank and a large plate by obtaining a condition, in which the camber does not generate in the finish worked part even after shearing treatment and deciding this condition as a leveling condition. SOLUTION: The camber amount after shearing the large plate is calculated based on a preliminary leveling condition, a condition before leveling a coil and a shearing condition of the large plate. When the calculated value is in a reference value, the camber amount at the time of producing the blank from the above preliminary leveling condition and the blank shearing condition. When this value is in the reference value, the actual coil is leveled in this preliminary leveling condition to produce the large plate by using a shearing machine 30. When the camber amount measured with a camber detector 10 is within the reference value, the blank is produced by using the shearing machine 30 from the large plate. When the camber amount of the blank measured with the camber detector 10 is within the reference value, the preliminary leveling condition is decided as the leveling condition. In the case of being out of the reference value in the above each step, the condition is changed and the same operation is repeated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for determining leveling conditions for performing leveling so as to correct a blank warp or a large plate warp of a steel strip, and a blank warp or a large plate based on the leveling conditions obtained by the method. The present invention relates to a leveling method for correcting warpage.

[0002]

2. Description of the Related Art Conventionally, metal steel strips and metal steel sheets used for cans, building materials, home electric appliances, etc. are rolled and wound into coils and subjected to shearing according to the purpose of use. Being used. At this time, the metal steel strip and the metal steel sheet are warped by the rolling and winding processes in the intermediate processing stage of production, and a rolling process for correcting warpage called leveling is performed before processing the product. JP-A-61-232017, JP-A-62-118918, JP-A-9-19-1
Various leveling techniques are disclosed in, for example, Japanese Patent No. 22756.

JP-A-62-232017 discloses a continuous process having at least one of a warp detector for continuously measuring the warpage of a steel strip in front of a roller leveler and a thickness gauge for continuously measuring the thickness of a steel sheet. In the line, the intermesh of the roller leveler is calculated and output according to the output of at least one of the warp detector and the thickness gauge, and the intermesh of the roller leveler is adjusted based on the output. In Japanese Patent Application Laid-Open No. 62-118918, the tilt angle, roll interval,
The tilt angle is set within a range that satisfies the formula defined by the yield stress, strain, number of rolls, etc., and then the optimum roll pushing amount is calculated by the formula defined by the Young's modulus, the correction coefficient, etc., and these tilt angles are calculated. A method has been proposed in which this is performed after initial setting of the roll pressing amount.

Further, Japanese Patent Application Laid-Open No. Hei 9-122756 has a process of performing a simulation using the information of a steel sheet before straightening and the specification information of a roller leveler to obtain a reduction amount of a leveler roll capable of absorbing the influence of a change in tension. A longitudinal warpage control method for a roller leveler has been proposed.

Here, an outline of the leveling process will be described for facilitating understanding of the invention. General leveling treatments include those described below. First, as shown in FIG. 1A, in a general leveling process, a roller leveler 1 (hereinafter simply referred to as “leveler”) performs leveling (warpage correction) so as to correct the warpage of the steel strip. Further, the steel strip subjected to the warp correction is sheared in the width (C) direction (direction perpendicular to the longitudinal L direction) by the shear 2 and, if necessary, is further subjected to split shearing in the L direction by the slitter 3. ,
They produced "large plates" or "blanks". In addition,
In the figure, for ease of explanation, a plurality of rolls and the like of the roller leveler 1 are schematically illustrated without being illustrated.

[0006] Further, generally, a steel material supplier ships the steel material to a customer in the following coil shape or large plate shape. In the case of shipment in the form of a coil, as shown in FIG. 1 (b), for example, after coiling in a plating line, warpage is corrected by a roller leveler while recoiling, and although not shown, the steel after warping is further corrected. The obi is coiled and shipped. At the customer, a blank is manufactured by performing a slit shearing process (split in the width direction) and further performing a shearing process with a shear or the like. FIG. 1 (b)
As shown in (1), when shipping on a large plate, the one after warpage correction by a leveler is shipped by shearing the large plate in the C direction with a shear or the like, splitting in the width direction at the customer, and blanking the blank. Will be manufactured. Conventionally, leveling has been performed with the aim of eliminating the warpage of the steel strip immediately before shipment and immediately after the leveler before performing the shearing treatment.

[0007]

However, Japanese Patent Application Laid-Open Nos. 61-23201 and 62-118 disclose the prior art.
In the method of performing leveling so as to eliminate the warpage immediately after the leveler proposed in Japanese Patent Application Laid-Open No. 918 and Japanese Patent Application Laid-Open No. 9-122756, the shipping side (steel material supplier) manufactures blanks and large plates at the customer site. Since blank warpage and large plate warpage as final components were not taken into consideration, blank warpage (L warpage and the like) and large plate warpage at the customer could not be suppressed.

That is, although the warp is usually corrected in the coil stage, a large plate or a blank is manufactured by performing a shear shearing process or a slit shearing process after the warp correction. In some cases, recoiling may be performed after the warpage is corrected. In these cases, leveling is performed while changing the correction condition (leveling condition) while monitoring the amount of warpage with the warp detector, and even if the amount of warpage after leveling is eliminated, new recoiling, slitting, shearing, etc. Warpage occurs,
There has been a problem that the warpage of the blank, which is a finally produced plate material, does not reach a desired value, which hinders the customer, for example, can manufacture. Therefore, warpage may occur at the time of shipment, but after blanks and large plates are manufactured at the customer's site, there has been a long-awaited demand for means for eliminating the warpage.

Accordingly, the present invention has been made to solve the above-mentioned unsolved problem, and is intended to prevent warpage from occurring even after the steel strip after leveling is sheared into a blank or a large plate as a final member. It is another object of the present invention to provide a method for determining a leveling condition and a leveling method for eliminating warping in a finally produced member under the leveling condition obtained by the method.

[0010]

According to the first aspect of the present invention, there is provided a method for determining a leveling condition for performing leveling for correcting a warp of a steel strip. Assuming that a shearing process is performed on the final generation member in the shearing, even after the shearing process, a condition under which the final generation member does not warp is determined, and the determined condition is determined as a leveling condition. Is provided. It should be noted that a large plate or a blank may be used as the final member.

The large plate is a steel plate which is not cut in the width direction but is a cut plate, and the blank is a large plate which is further divided in the width direction and the longitudinal direction. The shearing is shearing by a shear, a slitter, or the like, and includes both shearing to a large plate and shearing to a large plate and further to a blank.

According to a second aspect of the present invention, there is provided a leveling method for performing leveling for correcting warpage of a steel strip, wherein the steel strip is subjected to a shearing treatment on a final member in shearing. A leveling method is provided in which a condition under which warpage does not occur in the final product member is determined even after the shearing treatment, and leveling for correcting warpage of the steel strip is performed using the determined condition as a leveling condition.

The invention according to claim 3 is a more specific mode of the invention according to claim 1 and is a method for obtaining a leveling condition for performing leveling for correcting warpage of a steel strip, comprising: A first step of inputting conditions including a leveling condition and a shearing condition, calculating a warp when shearing after leveling, and determining whether or not the warpage after the shear calculated in the first step is within a reference value; When the value is within the range, the process proceeds to the next step. On the other hand, when the value is not within the reference value, the tentative leveling condition is changed and the process proceeds to the first step;
Under temporary leveling conditions, after leveling the actual coil, shear, determine whether the warpage after shearing is within the reference value, and when it is within the reference value, determine the previous temporary leveling conditions as leveling conditions. On the other hand, when it is not within the reference value, a third step of changing the provisional leveling condition and proceeding to the first step is a method for determining a leveling condition.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. First, a system configuration for implementing the method according to the present invention will be described with reference to FIG.

The present system has a warp detector 10 for detecting a warp amount of a given steel material, and a computer 20 connected to receive the warp amount detected by the warp detector 10. An arithmetic unit 20a for performing an arithmetic process such as calculation of an initial leveling condition, and a warpage determination unit 20b for performing a process of determining whether the received warpage amount is within a predetermined reference value. And,
The CRT 22 includes a CRT 22 for displaying an instruction based on a determination result of the warpage determination unit 20b and the like, and a keyboard 23 for inputting data and the like necessary for calculation.

The operation unit 20a and the warpage determination unit 20b
Can be realized by an electronic device such as a ROM having a built-in operation program, a CPU performing an operation according to the operation program, and a RAM functioning as a work area.

Further, as another device constituting the present system, a roller leveler 40 for correcting the warpage (leveling) of the steel material given by the worker with a plurality of rolls, a shearing device for the steel material given by the worker or There is a shearing machine 30 that performs a shearing process such as slitting. The vertical lap amount of the roller is referred to as a reduction amount (inter mesh) and is one of the parameters for determining a leveling condition. The roller leveler 40 is provided with a reduction amount variable mechanism (not shown). . There are other parameters for determining the leveling condition, but in the description of the present embodiment, the value of the rolling reduction (intermesh) is assumed to be the leveling condition for ease of description.

Now, processing for implementing the method according to the present invention using the system shown in FIG. 4 will be described with reference to FIG. First, in step S10 of FIG. 2, calculation is performed based on the provisional leveling conditions (leveler inlet side reduction amount, leveler outlet side pressure amount), conditions of the original coil (before leveling), and shear conditions of the large plate to be manufactured. Part 20a
Calculates the amount of warpage after large plate shearing based on the calculation formula. Specifically, the operator inputs a specific numerical value such as `` leveler inlet side reduction amount, leveler outlet side pressure amount, temper degree, plate thickness, plate width, shear length, initial warpage amount, tension '' through the keyboard. Arithmetic unit 20
When given to a, the calculation unit 20a calculates the amount of warpage after shearing the large plate by the following equation.

D = F {leveler inlet side reduction amount, leveler outlet side pressure amount, tempering degree, plate thickness, plate width, shear length, initial warpage amount, tension}. Here, F represents a function that determines the amount of warpage d from the eight parameters, and specifically, the tempering degree, the sheet thickness, the sheet width, the shear length, the initial warpage amount,
The tension is kept constant, and the leveling pressure on the leveler inlet side and the leveling pressure on the leveler outlet side are changed, and the warpage at that time is determined.

It should be noted that the warping amount d and 8
The fact that the two parameters are related is described in, for example, "Kawasaki Steel Technical Report vol. 20 No. 1 1988".
Analysis of strip bending behavior of strip in process line and its application ".

Further, in Step S20, Step S
The amount of warpage after large plate shearing calculated in 10 is, for example, “−10”.
When (mm) <the amount of warp d <+10 (mm) ”is set as the reference value, it is instructed to proceed to step S30 when the value is within the reference value, and to proceed to step S100 when the value is not within the reference value. The message is displayed on the CRT 22. In step S100, the temporary leveling condition used previously is changed, and in step S10, the warpage during large plate manufacturing is calculated under this condition, and the process proceeds to step S20.

Next, in step S30, step S1
Under the temporary leveling conditions and blank shearing conditions used at 0, the amount of warpage during blank production is calculated. Further, in step S40, the amount of warpage after blank shearing calculated in step S30 is, for example, “−10 (mm) <warpage amount d <
In the case where “+10 (mm)” is set as the reference value, a message instructing to proceed to step S50 when the value is within the reference value, or to proceed to step S110 when not within the reference value, is displayed on the CRT 22.

In step S110, the provisional leveling condition used previously is changed, and in step S30, the warpage in manufacturing a large plate is calculated under this condition, and the flow advances to step S40.
Next, in step S50, the worker levels the actual coil under the temporary leveling conditions used in step S30, and manufactures a large plate using the shearing machine 30.

In step S60, the large plate manufactured in step S50 is provided to the warp detector 10. Then, the warpage determination unit 20b determines whether the amount of warpage measured by the warp detector 10 is within a predetermined reference value, and if it is within the reference value, proceeds to step S70. If not, a message instructing to proceed to step S100 is displayed on the CRT 22. Step S100
Then, the tentative leveling condition used previously is changed, and the warpage at the time of manufacturing a large plate is calculated under this condition in step S10, and the process proceeds to step S20.

Next, in step S70, step S5
A blank is manufactured from the large plate manufactured in Step 0 using a shearing machine 30. In step S80, the blank manufactured in step S70 is provided to the warp detector 10. Then, the warpage determination unit 20b determines whether or not the warpage amount measured by the warp detector 10 is within a predetermined reference value. If the warpage amount is within the reference value, the process proceeds to step S90. If not, a message instructing to proceed to step S110 is displayed on the CRT 22. Step S110
Then, the tentative leveling condition used previously is changed, the warpage during blank production is calculated under this condition in step S30, and the process proceeds to step S40.

Then, in step S90, step S
The temporary leveling condition used in 50 is determined as the leveling condition. In the above-described embodiment, in the case where a large plate obtained by shearing a coil is shipped and a blank is manufactured at a customer, the standard is based on the warpage of the large plate at the time of shipment and the warpage when the blank is manufactured at the customer. This was for the case where a value was set. In addition, for example, when a large plate and a blank are manufactured at a customer site when shipped in a coil state, a reference value is not set for the blank warpage. In this case, a part of the processing steps shown in FIG. 2 (S30,
The processing may be performed such that S40, S110, S70, and S80) are omitted.

In the above-described processing, the coil may be warped after leveling. A feature of the present invention is that warping may occur after leveling, but a leveling condition for eliminating warping in a final product such as a large plate or a blank is found.

If the leveling conditions are determined in this way and the leveling for correcting the warpage of the coiled steel strip is performed under these conditions, the amount of warpage during the production of a large plate or blank can be reduced. Can be realized.

FIG. 3 is an explanatory diagram showing the effect of the present invention. It shows the maximum values of the warpage of the coil, the large plate, and the blank in the related art and the present invention. At this time, the leveling conditions are as follows: the leveler inlet side reduction amount “4.2 (mm)”,
Leveler outlet side reduction amount "2.6 (mm)", tension "2 (k
gf / mm ² ) ”.

As shown in FIG. 3, according to the prior art, the warpage of the coil is relatively small, but the warpage of the large plate or the blank is relatively large. On the other hand, according to the present invention, on the contrary, although the amount of warpage of the coil is relatively large, the amount of warpage of the large plate or the blank is relatively small. In other words, suitable for can manufacturing, etc.
This means that blank warpage can be suppressed.

As described above, even when a blank or large plate is manufactured from a steel strip after leveling, a leveling condition that does not cause blank warpage or large plate warpage is determined, and this is determined as the leveling condition. Since the leveling conditions under which the amount of warpage becomes a desired value can be determined, and the leveling is performed under these leveling conditions, there is an effect that the amount of warpage of a blank or a large plate becomes a desired value.

[0032]

As described above, claim 1 or claim 3
According to the invention according to the present invention, from a steel strip, for example, when manufacturing a blank or large plate, a leveling condition that does not cause blank warpage or large plate warpage is determined, and this is determined as the leveling condition. There is an effect that the leveling condition that makes the amount of warpage of the large plate a desired value can be determined.

According to the second aspect of the present invention, leveling is performed under such a leveling condition that a blank warp or a large plate warp does not occur even when a blank or a large plate is manufactured from a steel strip. There is an effect that the amount of warpage of the blank or the large plate becomes a desired value.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a conventional technique.

FIG. 2 is an explanatory diagram showing a process of the present invention.

FIG. 3 is an explanatory diagram showing an effect of the present invention.

FIG. 4 is a configuration diagram of a system for performing a method according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Roller leveler 2 Shear 3 Slitter 10 Warp detector 20 Computer 22 CRT 23 Keyboard 30 Shearer 40 Roller leveler

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Shinichiro Muto 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Chiba Works, Ltd. Kawasaki Steel Corporation Chiba Works

Claims (3)

[Claims] 1. A method for determining a leveling condition when performing leveling for correcting warpage of a steel strip, comprising assuming that a steel strip is subjected to a shearing treatment on a final member in shearing, and after the shearing treatment. A method for determining a leveling condition, wherein a condition under which warpage does not occur in the final generation member is determined, and the determined condition is determined as a leveling condition. 2. A leveling method for performing leveling for correcting warpage of a steel strip, assuming that a steel strip is subjected to a shearing treatment on a final product member in shearing. A leveling method in which a condition under which warpage does not occur in a finally formed member is obtained, and the obtained condition is used as a leveling condition to perform leveling for correcting warpage of the steel strip. 3. A method for obtaining leveling conditions for performing leveling for correcting warpage of a steel strip, comprising inputting conditions including temporary leveling conditions and shearing conditions.
A first step of calculating the warpage when shearing after leveling; and determining whether the warpage after shearing calculated in the first step is within a reference value. If the warpage is within the reference value, proceed to the next step. When the value is not within the reference value, the second step is to change the provisional leveling condition and proceed to the first step. Under the provisional leveling condition, after the actual coil is leveled and sheared, it is determined whether the warpage after the shearing is within the reference value. Is determined, and when it is within the reference value, the previous provisional leveling condition is determined as the leveling condition. On the other hand, when it is not within the reference value, the provisional leveling condition is changed and the third step proceeds to the first step. And a method for determining leveling conditions.