JP2531895B2 - Wear prevention method for steel plate strain roll - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing wear of a strained roll that presses a steel sheet to impart groove-like distortion, and particularly to a magnetic domain subdivision in a process of processing a grain-oriented electrical steel sheet. The present invention relates to a method for preventing stepped wear of a tooth type roll used for groove formation.

[0002]

2. Description of the Related Art When a steel plate is continuously rolled, the work roll surface that rolls down the plate is progressively abraded. It is well known that the corresponding roll surface locally undergoes extreme wear, which causes defects and defective shapes during subsequent strip rolling of the wide material.

In order to prevent such inconvenience, many measures have been taken in the past, for example, Japanese Patent Laid-Open No. 57-1307.
As disclosed in Japanese Patent Laid-Open No. 03-2003, there is a method of changing the position at which the rolled material is caught in the roll in the plate width direction for each rolled material to make the roll wear uniform in the width direction.
As disclosed in Japanese Patent Laid-Open No. 59-130604, it is proposed to swing the plate in the width direction on the entrance side of the rolling mill and pass the plate in this state through the rolling mill. A method of rolling the strip by continuously or intermittently moving the strip in the axial direction of the roll and rolling the strip by moving the unwinder in the axial direction is disclosed. Further, JP-A-60-13391
Japanese Patent Publication No. 0 discloses a technique for rolling a narrow material to a wide material one by one and providing a centering device for moving the plate material in the plate width direction on the front surface of the rolling mill.

[0004] These techniques are for changing the relative positions of the rolling roll and the steel sheet with respect to the rolling mill, and do not mention the protruding (tooth-shaped) roll that introduces distortion such as grooves into a thin steel sheet. In Japanese Patent Application Laid-Open No. 61-106717, a pressing roll is provided so as to face a straining (projection) roll that imparts a slight strain to the surface of a grain-oriented electrical steel sheet, and the pressing roll is supported by a plurality of backup rolls. A strain device is disclosed.

[0005]

DISCLOSURE OF INVENTION Problems to be Solved by the Invention A strain-preventing roll (hereinafter referred to as a tooth-shaped roll) having a spiral projection on its peripheral surface is used.
Magnetic (iron loss) by forming strain on steel sheets, especially grain-oriented electrical steel sheets
There are many proposals for improving the characteristics other than the above publications. This seed tooth type roll is made of a wear resistant material such as high speed steel or high C steel, but since the hard glass coating is formed on the surface of the material to be treated, the tooth tip wear amount is large. In particular, the wear of the portions corresponding to both ends (edge portions) of the steel sheet is remarkable, and when the amount of processing increases, a step (stepped wear) occurs. Therefore, it is necessary to oscillate the steel plate to achieve uniform wear of the roll as in the above-mentioned conventional technique. However, rocking the steel sheet during the strain imparting (pressing) process causes a problem that the roll tooth tip is damaged.

The present invention solves such a problem, and the tip of the roll is missing by adjusting the swing timing of the grain-oriented electrical steel sheet to change the relative position between the steel sheet and the tooth form roll. It is an object of the present invention to provide a method for preventing wear of a steel plate-strained roll that does not cause wear and can extend local life by eliminating local wear.

[0007]

In order to achieve the above object, the present invention provides a straining roll (tooth roll) having a spiral tooth pattern on its peripheral surface and a pressing roll supported by a backup roll. During the time when the steel plate welded portion arrives between the two rolls, depending on the wear amount of the pre-strained roll, when the steel plate is continuously pressed and pressed between the rolls to give a linear or dot-shaped groove to the steel plate. The gist is a method of preventing wear of a steel plate pre-straining roll, which is characterized in that the reduction of both rolls is released and the relative position of the steel plate and the pre-straining roll is changed. The amount of wear of the strain-applying roll may be quantified in advance in relation to the passing amount and the plate thickness, and in order to change the relative position, by moving at least one of the steel plate and the strain-applying roll. It can be carried out.

The present invention will be described in detail below. According to the present invention, a slab containing 4.5% or less of Si cast by an ordinary method is hot-rolled to form a hot-rolled sheet, and the hot-rolled sheet is annealed if necessary and then cold-rolled. Cold rolling is carried out once or twice by sandwiching intermediate annealing to obtain the final plate thickness. The steel sheet having the final thickness is subjected to decarburization in wet hydrogen and primary recrystallization annealing, and after applying an annealing separator, it is used as a coil for high-temperature finish annealing. After that, the surface of the steel sheet is subjected to an insulating film forming treatment.

According to the present invention, in a conventional method for producing a unidirectional electrical steel sheet including such main steps, a steel sheet having a glass coating on its surface after finishing high temperature annealing is cold rolled using a tooth roll. The direction intersecting the direction, that is, the orthogonal direction is preferable, but the groove is formed within an allowable range of ± 45 degrees with reference to this direction. FIG. 1 is a schematic front view showing an example of a tooth type roll used in the present invention, and FIG. 2 is a side view thereof. In the figure, reference numeral 1 is a tooth type roll, and tooth tips 2 are spirally formed on the peripheral surface. Reference numeral 3 is a non-driving press roll provided so as to face the tooth type roll 1, and applies a strain while pressing the steel plate between both rolls. Reference numeral 4 is a backup roll composed of a plurality of divided small rolls 5 arranged in the axial direction of the press roll 3, and the divided rolls 5 are eccentrically supported,
Adjust the position of the presser roll 3. Reference numeral 6 is an adjusting cylinder that is connected to the backup roll 4 and moves the presser roll 3 together with the backup roll 4 so as to move toward and away from the tooth profile roll 1, and 7 is a supporting carriage, and the rail 8 is on the tooth profile roll 1
It is installed so that it can be moved along.

When a glass-coated unidirectional electromagnetic steel sheet is continuously passed through the above-mentioned apparatus, the tooth die 2 of the tooth die roll 1 at the steel sheet contact portion has a worn portion 9 as shown in FIG. 4, for example. In particular, a step (stepped wear) 10 is generated at the portions corresponding to both ends (edge portion) of the steel plate. The step 10 deforms the steel plate itself when the wide steel plate passes through, causing defects and affecting the product. Therefore, according to the present invention, as shown in FIG. 5, the relative position of the steel plate 11 to the next position is changed from the current position 11a to the next position at the time when the predetermined amount of steel is passed before the stepped wear 10 that affects the product is formed. Change to 11b. Then, the relative position is sequentially changed to 11c to 11e for each passing of a predetermined amount.

To change the relative position of the steel plate, for example, as shown in FIG.
steering rolls 13a, 13 connected to a, 12b
It can be carried out by installing the steel plate rocking device 15 having b and tilting either or both of the steering rolls 13a and 13b. At this time, in the present invention, the rocked steel plate passes and the relative position is changed normally. While operating, the cylinder 6 shown in FIG. 2 is operated to operate the tooth form roll 1 and the presser roll 3.
The rolling reduction is released to prevent the tooth tip from being damaged due to the sliding friction that occurs when the steel plate swings.

The opening timing of the roll interval is determined by quantifying the relationship between the amount of passage to the tooth type roll 1 and the amount of wear. That is, according to the experimental examples of the present inventors, the strain processing amount of the grain-oriented electrical steel sheet and the wear amount of the tooth form roll (wear height from the tooth tip) have a relationship as shown in Table 1 below. Do you get it.

[Table 1]

As is clear from the examples in the above table, the wear amount (μ
m) = 0.2 × processing amount (Ton).

Further, an example of the wear amount of the tooth type roll which affects the product for each plate thickness was investigated, and Table 2 was obtained.

[Table 2]

In this way, the wear amount limit of the tooth profile roll (0.1 to 20 μm) is set in advance, and the variation cycle range (timing) of the relative position of the steel plate is determined according to each steel type. As shown in FIG. 3, a specific example is shown in FIG. 3, in which a welding portion detection device 15 is provided in the steel plate tracking in front of the tooth type roll, and the roll wear limit point set in advance is stored in the steel plate tracking device. The position of the steel plate welded portion close to the length to reach is measured, and when the welded portion approaches the steel plate swinging device 14, the measurement signal 16 is transmitted to operate the device, and the one-sided tooth roll device is rolled down. The release signal 17 is transmitted to operate the cylinder 6 to release the steel plate reduction of both rolls 2 and 3. In this case, from the measurement reference point 15
Calculate the time until the arrival of the relative position change point (welded part) and the opening of the reduction at the same timing. As a result, it is possible to prevent the occurrence of stepped wear of the tooth tips of the tooth type rolls. In the present invention, instead of the steel plate rocking device 14, the tooth form roll may be moved in synchronization with the reduction opening timing.

The amount of rocking of the steel plate or the amount of movement of the tooth profile roll is 0.5 without any wear step in the axial direction of the tooth profile roll.
A range of up to 50 mm / per turn is good.

During the passage of the grooving work, the steel plates are usually welded by lap welding or butt welding. When such a welded portion is rolled down by a tooth type roll, the tooth tips are broken or welded. Separation occurs in parts. Therefore, when passing through the weld, the reduction of the steel plate by the tooth profile roll and the press roll is released. In the present invention, it is advantageous from the viewpoint of productivity to utilize the timing of this reduction opening for changing the relative position of the steel plate and the tooth form roll. However, the present invention is not limited to this, and includes that the time point when the above-mentioned roll wear limit point reaches the tooth profile roll is set as the reduction opening timing.

[0018]

EXAMPLE C: 0.075% by weight, Si: 3.25 by weight
%, Mn: 0.07%, S: 0.025%, Al: 0.
027%, N: 0.008%, Sn: 0.10%, C
u: 0.05%, 1 slab consisting essentially of Fe
After heating to 380 ° C., hot rolling was performed to manufacture a hot rolled steel strip. This steel strip is pre-rolled, then annealed at 1120 ° C for a short time, then cold-rolled to form a cold-rolled sheet with a final sheet thickness of 0.23 mm, and then decarburized and annealed to treat steel strip C to 30 ppm or less. After that, an annealing separator containing MgO as a main component was applied and wound on a coil. Then 1200 on this coil
A high temperature finish annealing was performed at ℃ × 20 hours.

The high temperature finish annealed steel strip having a glass coating on its surface was subjected to continuous grooving work with a tooth roll to measure the service life of the tooth roll. The tooth roll used has a tooth tip with an inclination of 12.5 ° with respect to the roll axis, and the tooth gap (pitch) is 5 mm. Grooving with a load of 180 kg / mm ² by this tooth roll The steel strip surface to a depth of 14
A μm groove was formed. At this time, according to the method of the present invention, the relative position between the roll and the steel strip is set within 10 tons when the steel strip processing amount is within 30 tons.
mm changed. For comparison, continuous grooving processing was performed without changing the relative position. As a result, in the comparative method, the processing amount before the roll became unusable at the time of passing the central portion of the tooth type roll was about 150 tons, whereas in the method of the present invention, the processing amount was 5 lots to about 720 tons. The truth of the law 5
The roll life could be doubled.

[0020]

As described above, according to the present invention, the tooth type roll can have a long life, the roll replacement work can be reduced, the productivity can be further improved, and the roll cost can be reduced. Further, the operation management accompanying this is simplified, but the defects of the final product are reduced, and the target product can be efficiently obtained.

[Brief description of drawings]

FIG. 1 is an explanatory schematic diagram showing an example of a tooth type roll used for carrying out the method of the present invention.

FIG. 2 is a schematic side view showing an example of a tooth type roll device for carrying out the method of the present invention.

FIG. 3 is an explanatory view showing an example of steps for carrying out the method of the present invention.

FIG. 4 is an explanatory view showing an example of a wear condition of a tooth type roll.

FIG. 5 is an explanatory diagram showing an example of a situation in which the relative position of a steel plate is moved.

[Explanation of symbols]

 1: Tooth die roll 2: Tooth tip 3: Press roll 4: Backup roll 5: Divided roll 6: Cylinder 7: Truck 8: Rail 9: Worn part 10: Step 11: Steel plate 12a, 12b: Cylinder 13a, 13b: Steering Roll 14: Oscillating device 15: Welding part detecting device 16: Measurement signal 17: Reduction release signal

Claims (3)

(57) [Claims] 1. A steel plate is continuously passed and pressed between a straining roll having a spiral tooth pattern on its circumferential surface and a pressing roll supported by a backup roll, and the steel plate is linearly or dot-shaped. When applying the groove of No. 2, depending on the amount of wear of the strain-applying roll, and releasing the rolling of both rolls during the timing when the steel plate welded portion arrives between the rolls, the relative position of the steel plate and the strain-applying roll is changed. A method for preventing wear of a steel plate prestrained roll, comprising: 2. The amount of wear of the strained roll is quantified in advance in relation to the amount of threading and the thickness of the sheet.
A method for preventing wear of a steel plate prestrained roll as described. 3. The method for preventing wear of a steel plate pre-strain roll according to claim 1, wherein at least one of the steel plate and the pre-strain roll is moved to change the relative position thereof.