JPH07100537A - Straightening method for metal strips - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to provide a method for straightening a metal strip that can accurately and easily correct the curl of the metal strip by a leveler. [Structure] In a method of feeding a metal strip W wound in a coil shape and passing it between two sets of straightening rollers 4 and 5 to straighten the curl of the metal strip, two sets are provided by a controller 14. The gap between the straightening rollers is set to a size according to the plate thickness of the metal strip, and then the diameter of the coil of the metal strip is continuously detected. The controller applies the relationship between the coil diameter and the curl of the metal strip to determine the curl of the metal strip at the time of detection. Based on the size of the curl, the size of the gap between the two sets of straightening rollers that can correct the curl is calculated, and the gap between the two sets of straightening rollers is adjusted based on the calculated value. It is characterized by doing.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method for straightening a metal strip.

[0002]

2. Description of the Related Art A hard disk used as a recording / reproducing medium in a computer is manufactured by forming a donut disk from a strip material made of metal such as aluminum by press punching, and subjecting the donut disk to mechanical processing and magnetization treatment.

In order to improve the flatness accuracy of the metal strip, the curl is corrected by a leveler before press punching. That is, since the metal strip is manufactured in a wound state, when it is unwound from the coil, it returns to an arc shape due to residual stress, that is, a winding tendency occurs. Therefore, in order to form this donut disk with high flatness accuracy, it is necessary to correct the winding tendency of the metal strip to make it flat.

Conventional correction is performed by the following method.

The flatness of the metal strip is measured with a measuring device,
The operator adjusts the gap between the straightening rollers according to the measured value based on his own experience. This adjustment is performed for one coil about three times when the diameter is large, when the diameter is intermediate, and when the diameter is small.

[0006]

However, such a conventional correction method has the following problems.

When the correction is performed, the operator adjusts the gap between the correction rollers based on the intuition, that is, the actual value obtained so far, which causes an artificial error by each operator.

Further, since the operation of the leveler is stopped and the gap between the straightening rollers is adjusted each time the diameter of each coil is large, medium and small, the efficiency of the straightening work is reduced.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for straightening a metal strip that can accurately and easily correct the curl of the metal strip by a leveler.

[0010]

In order to achieve the above-mentioned object, a straightening method for a metal strip according to the present invention is a method for feeding a metal strip wound in a coil shape between two sets of facing straightening rollers. In the method of straightening the curl of the metal strip by passing through the sheet, first, the controller sets the gap between the two sets of straightening rollers to a size corresponding to the plate thickness of the metal strip, and then The diameter of the coil of the metal strip is continuously detected, and the size of the detected diameter of the coil is determined by the control device between the size of the diameter of the coil and the size of the winding tendency of the metal strip. By applying the relationship, the size of the curl of the metal strip at the time of detection can be known, and the curl can be corrected by the control device based on the size of the curl of the metal strip. Determine the possible size of the gap between the two sets of straightening rollers and Characterized in that based on the meta-value to adjust the gap between the two pairs of straightening rollers.

[0011]

In the controller, the relationship between the coil diameter and the winding tendency of the metal strip is stored in advance, and the detected coil diameter of the metal strip is input to the controller to detect the metal at the time of detection. The size of the curl of the strip is determined, and the control device first sets the gap between the two sets of straightening rollers to a size corresponding to the plate thickness of the metal strip, and then the straightening roller. The gap between them is determined according to the size of the diameter of the coil of the metal strip that has been detected.

Therefore, the operator does not have to make an artificial error as in the case where the operator adjusts the gap between the correction rollers by intuition, and the diameter of each coil changes. Since the leveler operation is not stopped every time and the gap between the straightening rollers is not adjusted, it is possible to correct the curl of the metal strip by the leveler accurately and easily.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings.

This embodiment is an example in which an aluminum strip W, which is a material for manufacturing a hard disk, is straightened by a leveler before punching with a press.

The apparatus to which the correction method of the present invention is applied will be described with reference to FIG.

The leveler 1 comprises a front stage unit 2 and a rear stage unit 3, and each of these units 2 and 3 includes an upper straightening roller group 4 and a lower straightening roller arranged so as to face the upper straightening roller group 4. The upper straightening roller group 4 has a group 5 and is vertically moved by a servomotor 6.

The servomotors 6 used for the upper roller groups 4 in the front and rear units 2 and 4 are provided with position detectors 7, respectively. The position detector 7 knows the position of the upper correction roller group 4 based on the driving amount of the servo motor 6.

Positioning drive units 8 and 9 for controlling the drive of the servo motor 6 are provided for each servo motor 6 of the front stage unit 2 and the rear stage unit 3.

A brake 1 for applying a constant tension to the coil holding shaft 18 is provided at the portion holding the coil around which the strip W is wound.
0, for example, a powder brake is provided, and a brake 1
A brake unit 11 for controlling 0 drive is provided. Further, a touch roll 12 and a differential transformer 13 are provided to detect the diameter of the coil.

Further, a control device 14 is provided to give a command to the front-stage and rear-stage units 2 and 4 and receive information from each detector. Further, a plate thickness input means 15 and a tension input means 20 are provided in association with the control device 14.

A method of correcting the bending of the aluminum strip W according to the present invention will be described.

In advance, the relationship between the coil diameter of the strip W and the curl of the strip W is programmed in the controller 14 in advance. The winding habit of the strip W is as shown in FIG.
Of the return height (mm) in a predetermined length (1 m) of Further, as shown in the diagram of FIG. 2, the winding tendency of the strip material decreases as the diameter of the coil increases.

Here, prior to driving the leveler 1,
The strip material W is fed from the coil and the upper straightening roller group 4 and the lower straightening roller group 5 of the front stage unit 2 in the leveler 1 are fed.
And the lower straightening roller group 5 of the latter unit 3 and then set in the press equipment.

Then, the start switch 19 is turned on.

First, the magnitude of the braking force applied to the coil of the strip W by the tension input means 20 is input to the control device 14 via the AD converter 22. The controller 14 is a strip W
The magnitude of the braking force applied to the coil of the DA converter 2
The brake unit 11 is instructed via 1.

The brake unit 11 drives the brake 10, and the brake 10 drives the coil holding shaft 1 by the drive.
Apply braking force to 8. This braking force is τ = D / 2m × TK
g, that is, T = 2 × τ / D.

Further, the plate thickness input means 15 inputs the plate thickness of the strip W to the controller 14. The controller 14 is a strip W
A command is given to each of the positioning drive units 8 and 9 via the DA converters 16 and 17 in accordance with the plate thickness. The positioning drive units 8 and 9 drive the servo motors 6 provided in the front stage unit 2 and the rear stage unit 3 of the leveler 1, respectively.

Each servo motor 6 vertically moves the upper straightening roller group 4 of each of the units 2 and 3, and the upper straightening roller group 4 is moved.
The gap between the lower straightening roller group 5 and the lower straightening roller group 5 is adjusted and set to a size corresponding to the plate thickness t of the strip W as shown in FIG. 4B from the relationship shown in FIG. The gap between the upper straightening roller group 4 and the lower straightening roller group 5 serves as a standard for the straightening dimension of the strip W.

In this state, the press equipment operates to convey the strip W, and the strip W is punched. The diameter of the coil gradually decreases as the strip W is conveyed. As described above, the braking force is applied to the holding shaft 18 by the brake 10, and the braking force is controlled by the control device 14 so as to be kept constant according to the diameter of the coil based on the above-described calculation formula. Therefore, a constant tension is applied to the coil from the beginning of the straightening (beginning of the rewinding) to the end of the straightening (the end of the rewinding) regardless of the change in the diameter of the coil.

Further, as the diameter of the coil changes, the roller 12 in contact with the outer peripheral surface of the coil is displaced, and the displacement is detected by the differential transformer 13 as the diameter of the coil. The differential transformer 13 uses the detected coil diameter as the AD converter 23.
To the control device 14 via. Thereby, the change in the diameter of the coil is continuously detected.

The controller 14 receives the detected value of the coil diameter which is continuously detected, and relates this detected value to the relationship between the coil diameter size of the strip W and the curl of the strip W programmed in advance. The size of the winding tendency of the strip W corresponding to the coil diameter at the time of fitting and detecting the coil diameter is obtained.

Further, the controller 14 selects the size of the gap ts between the upper straightening roller group 4 and the lower straightening roller group 5 in the front stage unit 2 and the rear stage unit 3 which can correct the curl at that time.

The control device 14 controls each of the selected units 2,
A command based on the size of the gap between the upper straightening roller group 4 and the lower straightening roller group 5 in 3 is given to each of the positioning drive units 8 and 9, respectively. The positioning drive units 8 and 9 drive the servo motors 6 of the front stage unit 2 and the rear stage unit 3, respectively.

Each servo motor 6 vertically moves the upper straightening roller group 4 in each of the front stage unit 2 and the rear stage unit 3 to form an upper straightening roller group 4 and a lower straightening roller group 5 as shown in FIG. 4C. The gap between them is set to a size that can correct the curl of the strip W.

As a result, the strip W passes through the gap between the upper straightening roller group 4 and the lower straightening roller group 5 as shown in FIG. 5, and also has a winding tendency as shown in FIG. 6A. The material W is straightened as shown in FIG. 6 (b).

Thus, the change in the diameter of the coil is continuously detected, and the gap between the upper straightening roller group 4 and the lower straightening roller group 5 is set in correspondence with the change in the coil diameter. The curl of the strip W is continuously corrected by continuously controlling the curl of W. The flatness of the target strip W is 0.3 mm / m or less, and the correction amount is ±
It is 60 mm or less.

The present invention is not limited to the above-mentioned embodiments, but can be modified in various ways.

[0038]

As described above, according to the method for straightening a metal strip according to the present invention, the controller stores in advance the relationship between the size of the coil diameter and the size of the curl of the metal strip. The detected diameter of the coil of the metal strip is input to the control device to determine the size of the winding tendency of the metal strip at the time of detection, and further, in the control device, the gap between the two straightening rollers is first detected by the control device. Is set to a size corresponding to the plate thickness of the metal strip, and then the gap between the straightening rollers is detected according to the size of the coil diameter of the metal strip.

Therefore, when the metal strip is straightened, there is no human error as in the case where the worker adjusts the gap between the straightening rollers by intuition, and the diameter of each coil. Since the operation of the leveler is not stopped and the gap between the straightening rollers is not adjusted each time the change occurs, it is possible to correct the curl of the metal strip by the leveler accurately and easily.

[Brief description of drawings]

FIG. 1 is a diagram illustrating an embodiment of a correction method of the present invention.

FIG. 2 is a diagram showing the relationship between the diameter of a coil and the curl of a strip.

FIG. 3 is a diagram for explaining a winding tendency of a strip material.

FIG. 4 is a diagram showing a gap between straightening rollers in a leveler.

FIG. 5 is a diagram for explaining curl correction of a strip material by a leveler.

FIG. 6 is a view for explaining how to curl the curl of the strip.

[Explanation of symbols]

1 ... Leveler, 2 ... Front unit, 3 ...
Rear unit, 4 ... Upper straightening roller group 5 ... Lower straightening roller group, 7 ... Position detector, 10 ...
Brake, 12 ... Touch roll, 13 ... Differential transformer, 15 ... Tension input means, 6 ... Motor.

Claims (1)

[Claims] 1. A method of straightening a metal strip wound in a coil shape and passing the strip between two pairs of opposing straightening rollers to straighten the curl of the metal strip, wherein the controller first comprises: The gap between the two sets of straightening rollers is set to a size corresponding to the plate thickness of the metal strip, and then the diameter of the coil of the metal strip is continuously detected, and the detected diameter of the coil. Is applied to the relationship between the size of the diameter of the coil and the size of the curl of the metal strip by the control device to determine the size of the curl of the metal strip at the time of detection. Further, the controller determines the size of the gap between the two sets of straightening rollers capable of correcting the curl based on the size of the curl of the metal strip, and the calculated value And adjusting the gap between the two sets of straightening rollers according to Method of straightening metal strips.