JPH10258315A - Leveling method of non-oriented silicon steel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce the non-oriented silicon steel excellent in level and magnetic property by combining, in the steel plate advancing direction, at first a large diameter roll, next a small diameter roll and at last a large diameter roll and specifying a diameter of the large diameter rolls and the small diameter roll. SOLUTION: The level correction of the non-oriented silicon steel is conducted by arranging, in the steel plate passing direction, a large diameter roll, next a small diameter roll and at last a large diameter roll. In this case, a diameter of the large diameter roll is 300-1000mm, a diameter of the small roll is 10-170mm. A passing tension is usual 0.3-2.0kg/mm<2> . A gap (clearance) of the large diameter roll is usual 2-500mm. In an arrangement to push up a steel plate by the small diameter roll upward, a downward warp shape of the steel plate is mainly straightened. In an arrangement to push down a steel plate by the small diameter roll downward, an upward warp shape of the steel plate is mainly straightened. Accordingly, when a steel plate shape at a leveler inlet side is preset to upward warp, a leveler set having a structure to push up small diameter roll upward only can achieve purpose.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to the production of non-oriented electrical steel sheets. That is, the present invention provides a non-oriented electrical steel sheet having excellent shape and magnetic properties, which is used for motors and small transformers in the electric industry.

[0002]

2. Description of the Related Art Non-oriented electrical steel sheets are usually steel sheets containing 4% or less of Si, and their functions are required to have low iron loss and high magnetic flux density. The motor core and the small transformer are used by punching and punching non-oriented electrical steel sheets to a predetermined size and then stacking them. recent years,
Almost everything from punching to laminating, caulking or welding is automated. In particular, there is a strong demand for a flat shape for non-oriented electrical steel sheets due to the demand for smooth productivity in these steps.

For this reason, conventionally, as shown in FIG. 2, before punching and punching, it is usual that the rolls are leveled by several rolls having the same diameter of about 50 mm. there were. In addition, a shape defect caused in a process of cold rolling or annealing, which is a manufacturing process of an electrical steel sheet, has been corrected by a cold leveler. Also in this case, leveling was carried out by several rolls having the same diameter of about 50 mm.

[0004] However, the shape correction by such a leveler has a magnetic property, especially a low magnetic field of 0.5 to 1.3.
It is known that iron loss and magnetic flux density deteriorate in the T region, and no effective means for preventing deterioration has been proposed to date.

Japanese Unexamined Patent Publication (Kokai) No. 62-104626 proposes a device for correcting the shape of a combination of a large-diameter roll and a small-diameter roll. On the other hand, a mere combination of a large roll and a small roll could not prevent the deterioration of the magnetic properties.

[0006]

SUMMARY OF THE INVENTION In view of the above, the present invention provides a leveler method for minimizing deterioration of magnetic characteristics and correcting a non-oriented electrical steel sheet having a warp in a coil length direction. Is what you do.

[0007]

That is, the present invention provides a non-oriented electrical steel sheet using a cold leveler having a large-diameter roll, then a small-diameter roll, and then a large-diameter roll arranged in the sheet passing direction. When performing shape correction, the large-diameter roll is 300 to 1000 mmφ, and the small-diameter roll is 10 to 17 mm.
This is a method for correcting the shape of a non-oriented electrical steel sheet, characterized by using 0 mmφ to achieve both shape correction and prevention of magnetic deterioration.

There are three points of the present invention. One purpose is to correct the shape without deteriorating the magnetic properties in the shape correction leveler. Second, the means to achieve this is to use small and large diameter rolls as shown in FIG.
The arrangement is as follows. The third point is that the object is achieved by regulating the small and large roll diameters. In general, it is known that, when the roll is small, the shape is easily corrected, but distortion is easily introduced. On the contrary, when the roll is large, the distortion is hardly formed, but the shape is not easily corrected. For this reason, conventional levelers have abandoned that it is impossible to achieve both improvement in shape and prevention of magnetic deterioration. The present invention, by combining a large diameter and small diameter roll of a specific diameter,
It overturns this conventional wisdom.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The reasons for limiting the present invention will be described below. The roll arrangement of the leveler is based on FIG. That is, first, in the traveling direction of the steel sheet, a large-diameter roll,
Next, a combination of a small-diameter roll and finally a large-diameter roll. At this time, as shown on the left side of FIG. 2, in the arrangement in which the steel sheet is pushed up by the small-diameter roll, the downward warpage shape of the steel sheet is mainly corrected. In addition, as shown on the right side of FIG. 2, in the arrangement in which the steel sheet is pushed downward by the small-diameter roll, the warped shape of the steel sheet is mainly corrected. Therefore, for example, when the steel plate shape on the leveler-entering side is determined to be warped, the purpose can be achieved only by the leveler set having a structure in which the small-diameter roll is pushed up. When the direction of the warp shape of the steel sheet is not determined, FIG.
It is necessary to arrange six rolls as shown in FIG.

[0010] The diameter of the large-diameter roll is 300 mm or more and 100 mm or more.
0 mm or less. If the diameter is less than 300 mmφ, the magnetic properties are greatly deteriorated, so that it is impossible. Also, if the diameter exceeds 1000 mmφ,
Roll equipment costs are high and are not industrial and should be avoided.

The diameter of the small-diameter roll is 10 mm or more and 170 mm
Restrict to the following. If the diameter is less than 10 mmφ, the magnetic properties are greatly deteriorated, and must be avoided. On the other hand, if the diameter exceeds 170 mmφ, the shape of the steel sheet can hardly be corrected, so that it is not possible.

The threading tension is usually 0.3 to 2.0 kg / mm
Perform in ² . The higher the threading tension, the easier it is to correct the shape,
Conversely, magnetic deterioration is likely to occur, so 0.3 to 2.0 kg /
and mm ^2. The large-diameter roll interval (gap) is usually 2 to 500 mm. If it is too narrow, there is a danger that the rolls will come into contact with each other. In addition, a narrower one can increase the winding angle around a small-diameter roll, so that the shape can be easily corrected, but there is a risk of magnetic deterioration. Hereinafter, the embodiment will be described in detail.

[0013]

【Example】

[Example 1] 0.15% Si, 0.11% Mn, 0.0
7% P, 0.001% S, 0.001% C, 0.002
A non-oriented electrical steel sheet coil having a thickness of 0.5 mm and a width of 1000 mm was prepared. The longitudinal warpage of the original plate was sheared into a sheet having a total width of 1 m and then placed on a surface plate, and the maximum value was measured with a gap gauge. In addition, the magnetic flux density of the magnetic characteristic
Magnetizing force 300A / m, 50H according to C 2552 (1986)
The value measured in z was 1.34T. Leveler experiments were performed on the original coil under the following conditions, and the warpage and magnetic characteristics were measured by the above-described methods. The results are shown in Table 1. The amount of warpage after the leveler was indicated by + on the upper side and by-on the lower side. The arrangement of the rolls is one in the center of the upper roll and two in the lower roll before and after the upper roll. The interval between the lower rolls was 250 mm.

As shown in Table 1, when the roll diameter was within the range of the present invention, a roll satisfying both the shape and the magnetic properties was obtained. With a roll diameter outside the range of the present invention, only one of the shape and the magnetic properties could be satisfied. In particular, when the diameter deviates to the small side, even if the indentation amount is adjusted to about 0.1 mm, both the shape and the magnetic characteristics cannot be satisfied, and further fine adjustment is not possible industrially. . In addition, when it deviated to the larger diameter side, the shape was not corrected even if the pushing amount and the tension were increased. The amount of warpage after leveling is preferably small, and practically 2 mm or less is required. The magnetic characteristics B3 of the present invention were 1.0 T or more. The pushing amount is the pushing amount (mm) of the small-diameter roll in the vertical direction with respect to the external tangent of the large-diameter roll which is a pass line.

[0015]

[Table 1]

Example 2 3.0% Si, 0.15% M
n, 0.01% P, 0.001% S, 0.001% C,
0.001% N, 1.0% Al, the balance being substantially iron and coated with a surface insulating film, 0.35 mm thick, 1200
A non-oriented electrical steel sheet coil having a width of mm was prepared. The lengthwise warpage of the original plate was sheared into a sheet having a total width of 1 m and then placed on a platen, and the maximum value was measured with a gap gauge to find that the warpage was 7 mm. The value obtained by measuring the magnetic flux density of the magnetic characteristics with an Epstein sample at a magnetization force of 300 A / m and 50 Hz according to JIS C 2552 (1986) is 1.45.
It was T. Leveler experiments were performed on the original coil under the following conditions, and the warpage and magnetic properties were measured by the above-described methods. The results are shown in Table 2. The amount of warpage after the leveler was indicated by + on the upper side and by-on the lower side. The arrangement of the rolls is one in the center of the lower roll and two in the upper roll before and after the lower roll. The interval between the upper rolls was 100 mm.

As shown in Table 2, when the roll diameter was within the range of the present invention, a material satisfying both the shape and the magnetic properties was obtained. With a roll diameter outside the range of the present invention, only one of the shape and the magnetic properties could be satisfied. In addition, it is preferable that the amount of warpage is small, and in particular, 2 mm or less,
The magnetic characteristics B3 of the present invention were 1.1 T or more. Assuming straightening with the six rolls shown in FIG.
When the steel sheet was turned upside down and then passed again under exactly the same leveler conditions, the warpage was 0.6 mm, and the B3 was 1.41 T, which was satisfactory. Results were obtained.

[0018]

[Table 2]

[0019]

As described above, by controlling the roll diameter, a non-oriented electrical steel sheet having excellent magnetic properties as well as shape can be obtained.

[Brief description of the drawings]

FIG. 1 shows an example of an arrangement of a leveler roll according to the present invention.

FIG. 2 shows a conventional leveler roll arrangement example.

Claims (1)

[Claims] 1. A large-diameter roll in the direction of passing a steel sheet,
When performing shape correction of a non-oriented electrical steel sheet using a small-diameter roll and a cold leveler further arranged with a large-diameter roll, by using 300 to 1000 mmφ as the large-diameter roll and 10 to 170 mmφ as the small-diameter roll, And a method for correcting the shape of a non-oriented electrical steel sheet, wherein the shape is corrected and the magnetic deterioration is prevented at the same time.