JP2000204477A - Continuous production equipment of high-silicon steel strip having insulating film coating equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To appropriately control the tension of a steel strip in a siliconizing part and an insulating film coating part and to provide a continuous production equipment of a high-silicon steel strip by which the siliconizing of steel strip and the insulating film coating are continuously conducted in the same equipment. SOLUTION: A steel strip is siliconized by chemical vapor deposition in a continuous siliconizing furnace 2 to form a high-silicon steel strip, and the high-silicon steel strip is subsequently coated with an insulating film and baked in this continuous production equipment of a high-silicon steel strip. A pinch-type bridling device consisting of a couple of endless rotors and pinching a steel strip leaving a linear moving part, a roll coater 4 for forming an insulating film, a steel strip tension detector 1, an insulating film baking furnace 5 and a tension reel 6 are provided in this order from the outlet side of the continuous siliconizing furnace, and the steel stip tension of the insulating film coating part is separated from the siliconizing furnace side to perform independent tension control of the coating part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a steel strip having a relatively low Si content, which is subjected to a silicon carbide treatment by chemical vapor deposition to form a high silicon steel strip, and then to a coating and baking treatment of an insulating film. It relates to a continuous production facility for silicon steel strip.

[0002]

2. Description of the Related Art Continuous production equipment for producing high silicon steel strip by subjecting a steel strip to siliconizing treatment by chemical vapor deposition is used for the purpose of preventing breakage of the steel strip, maintaining the shape of the steel strip and preventing meandering. Steel strip tension in the siliconizing furnace is usually 0.05-0.25k
The tension is controlled within a range of fine tension of about g / mm ² .

[0003]

In such a continuous production facility, when the continuous coating of the insulating film is to be performed on the outlet side of the continuous siliconizing furnace, the steel strip tension required for the continuous coating of the insulating film is continuous. Since it is completely different from that in the siliconizing furnace, problems such as the occurrence of meandering of the steel strip at the insulating coating coating and the inability to uniformly apply the insulating coating to the entire width of the steel strip due to the warpage or deformation of the steel strip. Occurs. Generally, a roll bridle is used for separating the tension of a steel strip in a continuous line. However, since a high silicon steel strip containing 4 wt% or more of Si is a brittle material, it is an extreme like a conventional roll bridle. When a bend or multiple bends are applied, the steel strip easily breaks. For this reason, it is practically difficult to perform continuous coating on the steel strip after the siliconizing treatment in the same continuous manufacturing facility.

[0004] In view of the above, in the production of a high silicon steel strip by the conventional continuous siliconizing treatment, there is an example in which the continuous siliconizing treatment furnace and the insulating film coating equipment are separately manufactured for industrial production. However, high-silicon steel strips manufactured without the application of an insulating film have the problem of corrosion after winding and before the application of the insulating film. To avoid this problem, rust prevention can prevent condensation and the like. Excessive equipment such as a yard (rust prevention yard similar to a clean room) is required. Therefore, in the continuous production process of the high silicon steel strip, it can be said that it is practically essential that the steel strip exiting the continuous siliconizing furnace is continuously coated with an insulating film by any method.

Accordingly, it is an object of the present invention to appropriately control the tension of the steel strip in the siliconized part and the insulating coating part, and to continuously perform the siliconizing treatment and the insulating coating on the steel strip in the same facility. It is an object of the present invention to provide a high-silicon steel strip continuous production facility capable of performing the above-mentioned steps.

[0006]

According to the present invention, a roll coater for coating an insulating film and an insulating film baking treatment furnace are provided downstream of a continuous siliconizing treatment furnace. Provide a specific pinch-type bridle device between the siliconizing furnace and the roll coater, and if necessary, between the insulation film baking furnace and the tension reel to separate the additional tension of the high silicon steel strip. By separating the steel strip tension of the insulation film coating from the continuous siliconizing furnace side and, if necessary, the tension reel side, independent tension control can be performed on the insulation film coating part, and meandering and coating of the steel strip This enables stable insulation coating to be performed without causing defects or the like.

That is, the continuous production equipment for high silicon steel strip according to the present invention has the following features. [1] A high silicon steel strip obtained by subjecting a steel strip to a siliconizing treatment by chemical vapor deposition in a continuous siliconizing furnace to form a high silicon steel strip, and then applying and baking an insulating film to the high silicon steel strip. A continuous production facility for strips, a pinch-type bridle device for pinching a steel strip between the linearly moving parts of a pair of endless rotating bodies in order from a continuous siliconizing furnace exit side, a roll coater for applying an insulating film, A continuous production facility for high silicon steel strip having an insulation coating application equipment, comprising a steel strip tension detector, an insulation coating baking furnace and a tension reel.

[2] The steel strip is siliconized by chemical vapor deposition in a continuous siliconizing furnace to form a high silicon steel strip,
This is a continuous production facility for high silicon steel strips for continuously applying and baking an insulating film to the high silicon steel strip, and a linear movement of a pair of endless rotating bodies in order from the exit side of the continuous siliconizing furnace. A pinch-type bridle device for pinching steel strips between parts, a roll coater for coating insulation films, a tension detection device for steel strips, an insulation film baking treatment furnace, and a steel strip between linear moving parts of a pair of endless rotating bodies. A continuous production facility for high silicon steel strip having an insulation coating application facility, comprising a pinch-type bridle device for pinching and a tension reel.

[0009]

FIG. 1 shows an embodiment of a continuous production facility for high silicon steel strip according to the present invention. In the figure, reference numeral 2 denotes a continuous siliconizing furnace, 1 denotes a steel strip tension adjusting device provided on the entrance side of the continuous siliconizing furnace 2, and 7 denotes steel between the tension adjusting device 1 and the continuous siliconizing furnace 2. A pre-furnace tension detecting device for detecting belt tension, 10 is a tension detecting device for detecting steel band tension at the outlet side of the continuous siliconizing furnace 2, and 12 is a continuous tension detecting device based on the tension detected by the tension detecting device 10. Silicon treatment furnace 2
This is a speed control device for controlling the peripheral speed (drive motor 11) of the hearth roll inside.

In such a high silicon steel strip continuous production facility, a pair of endless rotating bodies (for example, an endless belt,
A pinch-type bridle device 3 for pinching the steel strip S between linearly moving parts of a caterpillar body, etc., a roll coater 4 for applying an insulating film, a tension detecting device 8 for detecting a steel strip tension, an insulating film baking treatment furnace 5, A tension reel 6 is provided in order, and further, the winding speed (drive motor 9) of the tension reel is adjusted based on the detected tension of the tension detecting device 8,
Thereby, a tension control device 13 for controlling the steel strip tension of the insulating film coating portion is provided.

The pinch-type bridle device 3 is provided between the outlet side of the continuous siliconizing furnace 2 and the roll coater 4 for the purpose of separating the additional tension of the high silicon steel strip. Usually, a roll bridle is used to separate the tension of the steel strip.
A high-silicon steel strip containing wt% is a brittle material and breaks when subjected to extreme bending or multiple bending, so that a normal roll bridle cannot be used.

The pinch-type bridle device 3 has a structure in which an endless rotating body such as an endless belt or a so-called caterpillar body has a structure in which a linear moving portion is formed in a part of an outer peripheral direction thereof, and a pair of rotating members. An endless rotating body is arranged such that their linear moving parts are opposed to each other, and the steel strip S is pinched between the linear moving parts so that tension separation of the steel strip before and after the steel strip S can be performed. For example, in FIG. 3 or FIG.
An apparatus having a structure as shown in FIG.

The pinch type bridle device 3 shown in FIG.
A pair of upper and lower caterpillar bodies 14a, 1 which pinch the steel strip S
4b, a holding mechanism 15 (cylinder device or the like) for holding the upper caterpillar body 14a and lowering the steel strip S, and a driving device (not shown) for rotating and driving the upper and lower caterpillar bodies 14a, 14b. ing. Each of the upper and lower caterpillar bodies 14a and 14b is constituted by a chain belt in which a number of rectangular segments 16 are connected, and inside each of them is an annular guide mechanism 1 for holding the chain belt.
9 (in FIG. 3, the guide mechanism 19 is shown only for the lower track body 14b).

A sprocket wheel 17 for driving a chain belt is provided at one end inside each of the caterpillar bodies 14a and 14b. Therefore, each of the caterpillar bodies 14a and 14b is
7 and circulates along an annular guide mechanism 19. A rubber coating layer is formed on the upper surface of each segment 16.

The annular guide mechanism 19 is configured to hold the steel strip pinch portion in a linear shape in the circumferential direction of the track, and to hold the other portions in an appropriate shape such as an arc shape in the circumferential direction.
As a result, the steel strip pinch portions of the upper and lower caterpillar bodies 14a and 14b move linearly by bringing the plurality of segments 16 into contact with each other at the ends thereof.
To be able to pinch. Accordingly, the pinch-type bridle device 3 reliably pinches the steel strip S passing between the linear moving parts 18 of the upper and lower caterpillar bodies 14a, 14b by surface contact, whereby the steel strip is rotated. The tension separating function can be achieved without bending S. For this reason, even for brittle materials such as high silicon steel strip,
Tension separation can be performed without breaking this.

FIG. 4 shows another example of the structure of the pinch-type bridle device 3. The pair of upper and lower caterpillar members 20a and 20b for pinching the steel strip S and the upper caterpillar member 2 are shown.
0a, an endless belt 21 movably stretched outside the
A guide roll 2 that guides the endless belt 21 at each position on the steel strip entry side and the exit side with respect to the upper caterpillar body 20a.
2A and 22B, and an endless belt tension adjusting roll 23. Each of the caterpillar bodies 20a and 20b is constituted by a chain belt that connects a number of rectangular segments similarly to the bridle device shown in FIG. 3 and is driven to rotate between sprocket wheels (neither is shown). A linear moving portion 24 that allows the plurality of segments to linearly move the band pinch portion by bringing the ends into contact with each other.
It is configured in.

Similarly to the bridle apparatus of FIG. 3, inside the respective caterpillar bodies 20a and 20b, appropriate portions such as a steel strip pinch portion in the circumferential direction of the caterpillar are linearly formed, and the other portions are arcuate. A guide mechanism (not shown) for maintaining the shape is provided. Further, this bridle device also holds the upper caterpillar body 20a and uses the steel strip S
(A cylinder device or the like) for reducing the pressure, and a driving device for rotating and driving the upper and lower caterpillar bodies 20a and 20b (both are not shown).

The endless belt 21 includes a guide roll 22
A, 22B and the tension adjusting roller 23 are wound around the upper caterpillar body 20a so as to surround the upper caterpillar body 20a. The guide rolls 22A, 2
2B is arranged on the entrance side and the exit side of the upper caterpillar body 20a by being supported by the bracket 25. The guide rolls 22A and 22B hold the endless belt 21 between them.
, So that the endless belt 21 contacts only the linear moving portion 24 of the upper caterpillar body 20a.

The tension adjusting roll 23 includes a frame 27
The tension of the endless belt 21 is adjusted by moving it up and down. The frame body 27 has a guide portion 28 in the vertical direction, and the tension adjusting roll 23 is attached to the guide portion 28 via its bearing member 29 so as to be able to move up and down. Frame body 27
The holding screw 30 with the handle 31
Are screwed, and the holding member 3 is attached to the bearing member 29.
0 is rotatably connected at its lower end, and by rotating the holding shaft 30 with the handle 31 to move up and down,
The tension adjusting roll 23 can be moved up and down.

In the present structural example, the endless belt 21 is configured to move by the rotational driving force of the upper caterpillar body 20a due to the frictional force with the upper caterpillar body 20a. 22B, at least one of the tension adjusting rollers 23 may be a drive roll, or a separate drive roll may be provided for movement.

Further, although a rubber coating layer is formed on the upper surfaces of the segments constituting the caterpillar bodies 20a and 20b in order to obtain a predetermined pinch force, the invention is not necessarily limited to such a configuration. The entire segment may be made of metal. The material of the endless belt 21 is not particularly limited, and a material that is generally used for industry may be used.

The pinch-type bridle device 3 as shown in FIG.
The steel strip S passing between the linear moving parts 24 of a and 20b is pinched reliably by surface contact, whereby the tension separating function can be achieved without bending the steel strip S. Therefore, similarly to the apparatus shown in FIG. 3, the high silicon steel strip can be separated in tension without breaking it.

Further, in this apparatus, a part of the endless belt 21 in the circumferential direction is formed at the steel strip pinch portion by the upper caterpillar body 20.
a and the steel strip S, the steel strip being the upper caterpillar body 2
0a is prevented from being caught between the segments. In addition, since the straight portion 26 of the endless belt 21 is formed between the guide rows 22A and 22B, and the endless belt 21 is configured to contact only the linear moving portion 24 of the upper caterpillar body 20a, the endless belt 21 is formed as a segment. And moves in synchronism with the caterpillar body 20a without causing a slip. In the pinch-type bridle device shown in FIG. 4, not only the upper caterpillar body 20a but also the lower caterpillar body 20b are used for the endless belt 21, the guide roll 2 and the like.
2A and 22B, a tension adjusting roller 23 and the like can be provided.

The tension detecting device 8 detects the tension of the steel strip in the coating portion of the insulating film. The tension detecting device 8 is a non-contact type in consideration of the scratches on the steel strip S and the damage of the insulating film. Preferably, a tension detector is used. The other tension detection devices 7 and 10 may be either a contact type or a non-contact type. In other drawings,
Reference numeral 11 denotes a motor for driving a hearth roll in the siliconizing furnace, and 9 denotes a motor for driving a tension reel.

In general, the continuous siliconizing furnace 2 has a heating zone, a siliconizing zone, a diffusion zone and a cooling zone in order from the entrance side, and continuously heats the steel strip to the processing temperature in the heating zone. After that, the Si is infiltrated by reacting with SiCl _{4 in the} siliconized zone,
After a continuous heat treatment for diffusing the steel sheet in the thickness direction, the coil is cooled in a cooling zone to produce a coil-shaped high silicon steel strip. Usually, the siliconized zone has a SiCl ₄ concentration of about 5
A processing gas (SiCl ₄ + carrier gas) of about ~ 35 mol% is supplied, and the steel strip introduced into this siliconized zone is siliconized at a processing temperature of about 1023 to 1200 ° C.
Continuously introduced into diffusion zone, 1200 ~ 1230 ℃
It is soaked at a moderate processing temperature.

In the continuous production equipment for high silicon steel strip according to the present invention shown in FIG. 1, a steel strip having a thickness of about 0.03 to 0.5 mm and a relatively low Si content (normally, a Si content: 4 w
(less than 10% by weight) and then siliconizing in a continuous siliconizing furnace 2 to form a high silicon steel strip (usually, Si content: 4 to 7 wt%), and then applying an insulating film with a roll coater 4. Subsequently, a baking treatment is performed in an insulating film baking treatment furnace 5, and the film is wound around a tension reel 6.

In the pre-furnace tension detecting device 7, a continuous siliconizing furnace is inserted.
Side steel strip tension is detected, and the tension is adjusted based on this detected tension.
The adjusting device 1 normally sets the furnace entrance side tension at 0.05 to 0.20 kg /
mm ²Control to the extent. Also, the tension detecting device 10
The tension of the steel strip on the exit side of the continuous siliconizing furnace is detected.
Based on the force, the speed control device 12
Feedback of peripheral speed of drive roll (drive motor 11)
Perform control.

By such control based on the detection of the steel strip tension at the entrance and the exit of the continuous siliconizing furnace 2, the steel strip tension inside the continuous siliconizing furnace 2 and the exit side of the furnace are kept within a predetermined range. It can be controlled with high precision. The lower limit of the steel strip tension in the continuous siliconizing furnace 2 and the outlet side of the furnace are defined from the viewpoint of preventing the meandering of the steel strip in the furnace and the upper limit thereof from the viewpoint of preventing thermal deformation of the steel strip. , Generally 0.05 to 0.20 kg / m
It is controlled in m ² about the strip tension.

The steel strip S is tension-separated between the continuous siliconizing furnace 2 and the roll coater 4 by a pinch type bridle device 3, and the tension of the steel strip at the coating portion of the insulating film is independently controlled. For this reason, the tension of the steel strip is detected by the tension detecting device 8 between the roll coater 4 and the insulating film baking furnace 5, and the tension control device 13 controls the tension reel 6 based on the steel strip tension.
The winding speed is adjusted, thereby controlling the tension of the steel strip in the insulating coating. The lower limit of the steel strip tension in the insulation coating is from the viewpoint of preventing the meandering of the steel strip in the coating part, uniform application of the insulation coating on the steel strip surface, and preventing the occurrence of poor winding appearance on the tension reel. Further, the upper limit is defined from the viewpoint of preventing the steel strip from breaking, and is generally controlled to a steel strip tension of about 0.5 to 1.0 kg / mm ² .

FIG. 2 shows another embodiment of the continuous production equipment for high silicon steel strip according to the present invention, in which the insulating film coating portion is formed not only from the side of the continuous siliconizing furnace but also by the tension reel 6. The tension can also be separated from the winding section side. For example, when it is necessary to apply high tension to take up a large-diameter coil on the tension reel 6 and perform winding,
High i content (for example, Si: 6.5 to 7.0 wt%)
Therefore, in the case where the brittleness of the steel strip becomes extremely large and it is necessary to wind the steel strip with extremely low tension, it is necessary to make the steel strip tension at the winding part of the steel strip different from that of the insulating film coating part. In such a case, it is necessary to separate the tension between the insulating film coating portion and the steel band winding portion so that the tension can be controlled independently of the steel band winding portion and the insulating film coating portion. The present embodiment shows a suitable equipment configuration in such a case.

In this embodiment, not only is the pinch type bridle device 3a provided on the output side of the continuous siliconizing furnace 2 (downstream of the tension detecting device 10), but also on the output side of the insulating film baking processing furnace 5. A peripheral speed (drive motor 9) of the pinch type bridle device 3b is adjusted based on a tension detected by a tension detector 8 provided between the roll coater 4 and the insulating film baking treatment furnace 5; Thus, a tension control device 13 'for controlling the steel strip tension of the insulating film coating portion is provided. Other configurations are the same as those of the embodiment shown in FIG. 1, and the same reference numerals are given and detailed description is omitted. The configuration of the pinch-type bridle device 3b is the same as that of the pinch-type bridle device 3a provided on the outlet side of the continuous siliconizing furnace 2.

In the continuous production equipment for high silicon steel strip shown in FIG. 2, the tension of the steel strip in the insulation coating is separated from both the continuous siliconizing furnace side and the tension reel side by the pinch type bridle devices 3a and 3b. In addition, the tension of the steel strip in the insulation coating is completely controlled independently. The tension detecting device 8 detects the steel strip tension between the roll coater 4 and the insulating film baking furnace 5, and the tension control device 13 'adjusts the peripheral speed of the pinch type bridle device 3b based on the detected tension. The steel strip tension at the coating is controlled. The steel strip tension of the insulating film coating is the same as that described in the embodiment of FIG.

The steel strip tension (winding tension) on the tension reel side at the exit side of the pinch type bridle device 3b.
Is appropriately adjusted according to the circumstances described above. Generally, the lower limit of the steel strip tension (winding tension of the tension reel) at the steel strip winding section has a lower limit in terms of preventing occurrence of abnormal winding appearance of the tension reel 6 and an upper limit in terms of preventing breakage of the steel strip. Regulated, usually 0.5-2.0
It is adjusted in the range of kg / mm ² . The steel strip tension control on the side of the continuous siliconizing furnace is the same as that described in the embodiment of FIG.

[0034]

According to the above-described continuous production equipment for high silicon steel strip according to the present invention, the steel strip is broken, the steel strip is meandering or deformed in the insulating coating, and the coating of the insulating coating is made non-uniform. It is possible to continuously and stably carry out the siliconizing treatment and the coating of the insulating film in the same facility without causing the above-mentioned problems.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing one embodiment of a continuous production facility for high silicon steel strip according to the present invention.

FIG. 2 is an explanatory view showing another embodiment of a continuous production facility for high silicon steel strip according to the present invention.

FIG. 3 is an explanatory view showing one embodiment of a pinch type bridle device used in a continuous production facility for high silicon steel strip according to the present invention.

FIG. 4 is an explanatory view showing another embodiment of a pinch type bridle device used in a continuous production facility for high silicon steel strip according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Tension adjusting device, 2 ... Continuous siliconizing furnace, 3, 3a, 3
b ... Pinch type bridle device, 4 ... Roll coater, 5 ...
Insulating film baking treatment furnace, 6: tension reel, 7: tension detector before furnace, 8: tension detector, 9, 9 ': drive motor, 10: tension detector, 11: drive motor, 12
... speed controller, 13, 13 '... tension controller, 14
a, 14b: caterpillar body, 15: holding mechanism, 16: segment, 17: sprocket wheel, 18: linear moving part, 19: guide mechanism, 20a, 20b: caterpillar body, 21: endless belt, 22A, 22B: guide Roll, 23: tension adjusting roll, 24: linear moving section, 25
... Bracket, 26 ... Linear part, 27 ... Frame body, 28
... Guide part, 29 ... Bearing member, 30 ... Holding shaft, 31 ... Handle

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Kazuhisa Okada, 1-2-1, Marunouchi, Chiyoda-ku, Tokyo, Japan Nihon Kokan Co., Ltd. (72) Michiaki Tsutsumi 1-2-1, Marunouchi, Chiyoda-ku, Tokyo, Japan F-term in Honko Co., Ltd. (reference) 4K030 AA03 AA16 BA29 CA02 CA17 DA09 FA10 GA14 HA03

Claims (2)

[Claims] 1. A high-silicon steel strip obtained by subjecting a steel strip to siliconizing treatment by chemical vapor deposition in a continuous siliconizing furnace, and subsequently applying and baking an insulating film to the high-silicon steel strip. A pinch-type bridle device for pinching a steel strip between linear moving parts of a pair of endless rotating bodies in order from a continuous siliconizing furnace exit side, and a roll for coating an insulating film. A continuous production facility for high silicon steel strip having an insulation coating application facility, comprising a coater, a steel strip tension detection device, an insulation coating baking treatment furnace, and a tension reel. 2. A high-silicon steel strip obtained by subjecting a steel strip to siliconizing treatment by chemical vapor deposition in a continuous siliconizing furnace, and subsequently applying and baking an insulating film to the high-silicon steel strip. A pinch-type bridle device for pinching a steel strip between linear moving parts of a pair of endless rotating bodies in order from a continuous siliconizing furnace exit side, and a roll for coating an insulating film. Coating machine, tension detecting device for steel strip, insulation film baking treatment furnace, pinch type bridle device for pinching steel strip between linear moving parts of a pair of endless rotating bodies, and tension reel Continuous production equipment for high silicon steel strip with equipment.