JPH0531425A - Annealing agent coating device - Google Patents

Abstract

PURPOSE:To obtain the applying device for the sepn. agent for annealing which can adequately and selectively apply the different sepn. agents by supplying the sepn. agent for annealing by two systems of supplying means to the central part in the transverse direction and both side edges of a metallic strip. CONSTITUTION:The main sepn. agent is supplied to the central part of the metallic strip 1 from a nozzle header 2a and is smoothed to a prescribed thickness by a 1st squeezing roll 3a. The auxiliary sepn. agent is supplied from a nozzle header 2b to both side edges of the strip 1 and is smoothed to a prescribed thickness by a 2nd squeezing roll 3b. The change of the strip width and the coating region of the side edge parts can be adequately dealt with by swiveling the nozzle header 2a of the main sepn. agent within a horizontal plane and by moving the nozzle header 2 of the auxiliary sepn. agent forward and backward in the transverse direction of the strip. Then, the different sepn. agents for annealing varying in the compsn. are easily applied to the central part and both side edges of the metallic strip steel sheet and eventually the fluctuations in the electromagnetic characteristics over the transverse direction are drastically decreased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for applying an annealing separating agent, and more particularly to a device for separately supplying a separating agent having a different composition to the central portion and both side edges of a metal strip in a continuous strip. Is.

[0002]

2. Description of the Related Art Generally, in the manufacturing process of electromagnetic steel sheets used for electric motors, transformers, etc., before the box-type high temperature annealing for a long time, in order to prevent seizure of the steel sheet in the annealing characteristic, it is usually
An annealing separator containing gO as a main component is applied to the surface of the steel sheet after decarburization and primary recrystallization annealing. At the time of application to the surface of the above electromagnetic steel sheet, after supplying the separating agent to the steel sheet surface, the excess separating agent attached to the steel sheet surface is removed by a squeeze roll so that the separating agent having a predetermined thickness is attached to the steel sheet surface. There is.

In order to improve the magnetic properties of electromagnetic steel sheets, especially unidirectional electrical steel sheets, the <001> axis of the secondary recrystallized grains in the steel sheet must be highly aligned in the rolling direction. As one of the methods, a small amount of sulfide is applied to the surface of the steel sheet after decarburization and primary recrystallization, and the inhibitory effect of the inhibitor is strengthened by the action of S in this sulfide, and thus the degree of accumulation of goth-oriented grains is increased. There is a method for improving the magnetic properties by increasing the temperature (Japanese Patent Laid-Open No. 60-67625, Japanese Patent Publication No. 43-5996), and the application of sulfide to the steel plate surface is usually to mix the sulfide into the annealing separator. Done by.

The effect of S in the above-mentioned sulfide is to assist the secondary recrystallization in the final annealing. However, the secondary recrystallized grains are iron or iron if the grain size is too large or too small. It deteriorates the loss characteristics and causes an increase in energy loss when used in an iron core such as a transformer. Therefore, the S in the annealing separator should be adjusted so that the size of the secondary recrystallized grains becomes 1-20 mm in diameter.
The amount of compound added is adjusted.

The grain size of the recrystallized grains varies not only with the S content in the separating agent but also with various factors such as the composition of the base iron, the state of the grain grains and the heat history. It is important to apply an appropriate amount of S to each of the above factors. However, in the actual production of unidirectional silicon steel sheet, temperature unevenness across the sheet width direction occurs during hot rolling,
Therefore, the required amount of S differs in the sheet width direction, but in the past, the main purpose was to control the grain size in the center of the steel sheet.
Since the content of the S compound was determined, the generation of abnormal grains was unavoidable at the steel plate edge. Since magnetic properties, particularly iron loss properties, deteriorate in the portion where such abnormal grains occur, they must be discarded, resulting in a large decrease in yield.

In order to solve the above problems, the inventors first adjusted the S content in the separating agent at the central portion and both side edge portions in the width direction of the plate to obtain a crystal grain size in the width direction of the plate. Has been developed, and by extension, a method for manufacturing unidirectional silicon steel sheets that has made the magnetic properties uniform has been developed.
No. 418008.

[0007]

DISCLOSURE OF THE INVENTION The present invention is suitable for use in the production of the above-mentioned unidirectional silicon steel sheet,
It is an object of the present invention to propose an annealing separating agent applying device capable of appropriately applying different separating agents having different compositions in the plate width direction.

[0008]

That is, the present invention is an apparatus for applying an annealing separating agent to the front surface and / or the back surface of a metal strip that is continuously running, the center portion and both side edges of the strip in the width direction. This is an apparatus for applying an annealing separating agent (first invention) in which two sets of nozzle headers for separately supplying an annealing separating agent are provided to respective parts, and a squeeze roll is arranged at least behind the nozzle header on the downstream side.

The present invention is also an apparatus for applying an annealing separating agent to the front surface and / or the back surface of a continuously running metal strip, which comprises a nozzle header of the annealing separating agent having a transit length of at least the entire width of the strip, and a subsequent nozzle. The nozzle header is provided with two sets of supply pipes for individually supplying the annealing separating agent to the central portion and both side edges, and the central portion is provided inside the nozzle pipe. And an annealing separation agent coating device (second invention) in which two partition walls for preventing mutual mixing of the annealing separation agent supplied to both side edges are movably arranged.

[0010]

According to the present invention, the supply of the annealing separating agent to the widthwise central portion and both side edges of the continuously running metal strip is
By supplying separately by two systems of supply means,
The separating agent having the optimum composition can be effectively applied to each zone. Here, as the S compound, MgSO ₄ ,
SrSO ₄ and MnSO ₄ are suitable, and the amount of S compound in the annealing separator required to obtain crystal grains of a predetermined grain size in the normal part at the center of the steel sheet is 0.01 to 2% in terms of S.
And the suitable coating amount of such an annealing separator is 2
Approximately 10g / m ² (per surface).

[0011]

【Example】

Example 1 FIGS. 1A and 1B each schematically show a preferred example of a coating apparatus according to the first invention. In the figure, number 1 is a metal strip that is continuously running, 2a is a central nozzle header, and 2b-
1, 2b-2 are side edge nozzle headers, 3a is a first squeeze roll, and 3b is a second squeeze roll. In this example, only the front surface of the metal strip 1 is processed using the apparatus of the present invention, and the back surface is squeezed roll 3
The lower rolls of a and 3b also function as coating rolls, and the separating agent is applied by these rolls. Now, in the device shown in FIG.
First, a separating agent (hereinafter referred to as a main separating agent) to be applied to the central portion of the metal strip 1 is supplied from the nozzle header 2a to the central portion of the strip 1 and a first squeeze roll 3a arranged behind the stripping agent has a predetermined thickness. Smooth to. Further, a separating agent (hereinafter referred to as a sub-separating agent) to be applied to the side edge portion of the strip 1 is supplied to both side edge portions of the strip 1 from the nozzle header 2b, and a second squeeze roll 3 arranged behind it is provided.
It is smoothed to a predetermined thickness with b.

In the figure, the first squeeze roll 3a
Although the second squeeze roll 3b and the second squeeze roll 3b each have a length extending over the entire width of the metal strip 1, it is not always necessary to use a roll whose length extends over the entire width of the strip. You may use the short roll which contacts the strip 1 only in a center part, and as the second squeeze roll, the short roll which contacts the strip 1 only in both side edge parts may be used.

In the first aspect of the invention, the first ringer roll 3a is not always necessary, and as shown in FIG. 2, the nozzle headers 2a and 2b are provided on the central portion and both side edge portions of the metal strip 1 respectively for the main separating agent and After applying the sub-separating agent, it may be smoothed to a predetermined thickness with a single ringer roll 3.

In order to change the plate width or the coating area of the side edge portion, as shown in FIG. 3, for example, the nozzle header 2a of the main separating agent is swung in the horizontal plane, and the nozzle header 2b of the auxiliary separating agent is changed. Can be appropriately dealt with by moving the plate forward and backward in the plate width direction. Further, when the central nozzle header and the side edge nozzle header are perforated nozzle headers, the application area can be changed by increasing or decreasing the number of used holes. When the variation width of the plate width is relatively small, as shown in FIG. 4, the discharge amount from the central nozzle header can be changed and the side edge nozzle header can be moved by an appropriate amount. .

In applying the separating agent using the coating apparatus of the present invention, the main separating agent and the auxiliary separating agent are mixed to some extent to form an intermediate composition. It is preferable in terms of function.

Example 2 FIGS. 5 (a) and 5 (b) each schematically show a preferred example of the coating apparatus according to the second invention, in which reference numeral 4 is a long nozzle header and 5 is a squeeze roll. However, as in Example 1, the lower roll of the squeeze roll 5 also serves as a coating roll of the separating agent for the lower surface of the steel sheet. The interior of the long nozzle header 4 is divided by the partition walls 6a and 6b into the central portion 4a and both side edge portions 4b-1, 4b-2.
It is divided into three areas. Further, in each region, separating agent supply pipes 7a, 7b-1 and 7b-2 are provided so that separating agents having different compositions can be individually supplied.

By supplying the main separating agent and the sub-separating agent into the long nozzle header 4 from the supply pipes 7a and 7b-1 and 7b-2, respectively, the central portion and both side edge portions of the metal strip 1 are respectively supplied. After applying the separating agent having the optimum composition, the squeeze roll 5 arranged behind the separating agent smoothes the film to a predetermined thickness.

Here, the partition walls 6a and 6b are both
Since it is movably installed in the long nozzle header 4, it is possible to appropriately follow the change of the plate width and the change of the coating area of the side edge portion.

In all of the above examples, the case where the annealing separating agent is applied only to the surface of the metal strip by using the apparatus of the present invention has been described, but the present invention is not limited to this case, and the strip is not limited to this case. It goes without saying that the case where the separating agent is applied only to the back surface or both the front surface and the back surface is included.

[0020]

As described above, according to the present invention, it is possible to easily apply an annealing separator having a different composition to the central portion and both side edge portions of a metal strip steel sheet, and it is possible to greatly vary the electromagnetic characteristics across the width direction. Can be reduced to

[Brief description of drawings]

FIG. 1 is a schematic view of an annealing separating agent coating device provided with two sets of nozzle headers and two sets of squeeze rolls.

FIG. 2 is a schematic view of an annealing separating agent coating device provided with two sets of nozzle headers and one set of squeeze rolls.

FIG. 3 is a diagram showing a procedure for changing a coating area of a main separating agent and a sub separating agent.

FIG. 4 is a diagram showing another example of how to change the application areas of the main separating agent and the sub-separating agent.

FIG. 5 is a schematic view of an annealing separating agent coating device provided with a set of nozzle headers and a set of squeeze rolls.

[Explanation of symbols]

1 metal strip 2a Central nozzle header 2b Side edge nozzle header 3a 1st squeeze roll 3b Second squeeze roll 4 Long nozzle header 5 squeeze rolls 6a partition wall 6b partition wall 7a Main separating agent supply pipe 7b-1 Secondary separation agent supply pipe 7b-2 Secondary separation agent supply pipe

Claims (2)

[Claims] 1. An apparatus for applying an annealing separating agent to the front surface and / or the back surface of a continuously running metal strip, wherein the annealing separating agent is separately applied to the widthwise central portion and both side edges of the strip. An annealing separator coating device, comprising two sets of nozzle headers to be supplied, and a squeeze roll provided at least behind the downstream nozzle header. 2. An apparatus for applying an annealing separating agent to the front surface and / or the back surface of a continuously running metal strip, which comprises a nozzle header of the annealing separating agent having a transit length of at least the entire width of the strip and a nozzle header disposed behind the nozzle header. The nozzle header provided with the squeeze roll is provided with two sets of supply pipes for individually supplying the annealing separating agent to the central portion and both side edge portions of the nozzle header. An annealing separating agent coating device in which two partition walls are arranged so as to be movable so as to prevent mutual mixing of the annealing separating agents respectively supplied to the parts.