KR20060047984A - Method for using shape-detecting roll of metal strip - Google Patents

Abstract

In the shape detection roll of the cold rolling mill which performs a warm rolling especially, this invention prevents the detection abnormality caused by the invasion of a foreign material into a sensor gap, and aims at reducing plate break and extending roll replacement frequency, Water is always sprayed from the outside during the operation to almost the entire width direction of the shape detecting roll of the cold rolling mill of the strip, and the scraper is brought into contact with the exit in the roll rotational direction from the portion where the water is sprayed. When a cold rolling mill is a reverse line, two scrapers are provided in the inlet side and the outlet side in the roll rotation direction from the site | part which injected water.

Shape Detection Roll, Scraper, Metal Strip, Cold Rolling Mill, Spray Header

Description

METHOD FOR USING SHAPE-DETECTING ROLL OF METAL STRIP}

1 is an overall view of a shape detecting roll according to the present invention.

2 is a cross-sectional view of a sensor part of the shape detecting roll according to the present invention.

3 is a device layout diagram illustrating a method of use of the invention.

Fig. 4 is a diagram showing the situation at the time of right rotation in the method of use of the present invention.

Fig. 5 is a diagram showing the situation at the time of left rotation in the use method of the present invention.

Fig. 6 is a graph showing the change of factor in the conventional use method.

Fig. 7 is a graph showing the change in factor in the use method of the present invention.

<Explanation of symbols for the main parts of the drawings>

1: roll body

3: sensor cover

7: scraper

8: spray header

[Document 1] Japanese Patent Laid-Open No. 54-68283

[Document 2] Japanese Utility Model Publication No. 62-167109

[Document 3] Japanese Utility Model Publication No. Hei 1-32944

[Document 4] Japanese Patent No. 297177

The present invention relates to a method of using a shape detecting roll in a processing line of a metal strip.

In the processing line of a metal strip, as previously disclosed by Unexamined-Japanese-Patent No. 54-68283, the shape detection roll which assembled the load detection sensor in the width direction was contacted with a metal strip, and the tension distribution of the width direction of a metal strip was made to contact. I am measuring it. In particular, in a cold rolling mill, the shape of a metal strip is calculated based on this, and it controls to the target shape.

This shape detecting roll is disclosed in, for example, Japanese Utility Model Laid-Open No. 62-167109 and Japanese Utility Model Laid-Open No. Hei 1-32944, but is shown in Fig. 2 in the form as shown in Fig. 1. A sensor as described above is provided. And between the roll body 1 and the sensor cover 3, the clearance of several tens of micrometers is provided in order to block the load from a roll body.

However, in the processing line of the metal strip, it is unavoidable that iron powder or oil adhering to the metal strip surface is attached to the shape detecting roll, and the attachment penetrates into the gap of the sensor described above, resulting in deterioration of the sensitivity of the sensor. Since a different shape from the actual shape of the yarn is displayed, a plate breaking is often generated in a rolling mill which is controlled based on this. Moreover, in order to escape from this state, it was necessary to replace the shape detection roll, and the big line efficiency fall was caused.

As a means of solving the said problem, the method of wash | cleaning in operation can be considered. For example, Japanese Patent No. 297177 discloses a configuration in which water is sprayed onto a shape detection roll, and when it is determined that dirt adheres according to the detection result, the brush is contacted again to remove the deposit.

Particularly, when cold rolling is performed at a high temperature of a metal strip such as stainless steel or electronic steel sheet at a high temperature, the temperature detection of the shape detection roll is unavoidable to some extent. It fixedly attached and the clearance gap of a sensor became clogged, and it turned out that the sensitivity deterioration of a sensor is very fast.

As a method of solving this problem, a method of cooling the shape detecting roll can be considered. However, since the shape detecting roll has wiring from a sensor or the like, a method of passing a refrigerant inside the roll is complicated and cannot be adopted. Therefore, as disclosed in the aforementioned Patent No. 297177, it is possible to think of a method of spraying water and cooling it. However, due to the recent speed-up of the line, the sprayed water scatters and affects the surrounding measuring equipment, and is sufficient for cooling. Spraying a large amount of water reaches the contact surface between the shape detecting roll and the metal strip, and the shape detecting roll slips, and the accurate shape cannot be detected. As a result, plate breaking occurs.

An object of the present invention is to solve such a problem by always cooling and cleaning the shape detecting roll during operation, and to provide a method of using the shape detecting roll stably for a long time.

This invention is made | formed in order to solve the said subject, The summary is as follows.

(1) Metal strips characterized in that water is sprayed from the outside during the operation to almost the entire width direction of the shape detection roll of the cold rolling mill of the metal strip, and the scraper is brought into contact with the exit side of the roll rotational direction from the portion where water is sprayed. Method of using the shape detection roll.

(2) The method for using the shape detecting roll of the metal strip of (1), wherein the cold rolling mill is a reverse line, and the scraper is provided at the inlet side and the outlet side in the roll rotation direction from the site where water is sprayed.

(3) The use method of the shape detection roll of the metal strip as described in (1) and (2) characterized by the maximum temperature of the strip under rolling being 100-500 degreeC.

According to the present invention, the detection abnormality caused by the foreign matter fixed adhesion to the sensor gap of the shape detection roll is eliminated, and thus all the shape detection roll replacements are eliminated, and the plate breaking occurrence rate is one tenth of the previous. Significantly improved.

The present invention is characterized in that the roll is cooled to approximately 200 ° C. or lower and washed by spraying water from the outside during operation and contacting the scraper provided on the outlet side in the roll rotation direction to solve the above problem.

3 is a side view illustrating a method of use of the present invention. In the reverse rolling line of a metal strip, the spray header, the right rotation scraper, and the left rotation scraper are provided in the lower part of a rolling mill, a deflector roll, and the shape detection roll provided between them. Water is sprayed from the spray header 8 to the shape detection roll 1 to remove water by the scraper 7.

When the metal strip is on the top of the shape detecting roll, a header for spraying water is provided under the shape detecting roll, and the scraper is provided from the header position toward the exit side in the roll rotation direction.

Here, in a tandem rolling mill in which the rotation direction is one direction or in a rolling mill in a continuous process line, one scraper may be provided on the exit side of the rotation direction. do. At this time, it operates as shown in FIG. 4 at the right side rotation and as shown in FIG. 5 at the left side rotation.

By this cooling and washing | cleaning effect, iron dust, oil, etc. can be prevented from invading into the clearance gap on the surface of a shape detection roll to the minimum, and it can always detect an accurate shape by preventing fixed entry.

The spray header is installed so that water is sprayed on the entire roll width. Quantity and water pressure are not particularly specified. Since a certain amount of effects can be obtained to some extent, it may be appropriately determined according to the temperature of the shape detecting roll and the dehydrating ability of the scraper. In addition, the shape detecting roll is impossible to completely remove the water on the surface of the roll with a scraper due to the high-speed rotating body, and the remaining water needs to be detoxified by evaporation in order to prevent water scattering or slipping of the shape detecting roll. . Therefore, when the shape detection roll temperature falls to 50 degrees C or less by strip plate temperature fall etc., it is preferable to be able to automatically control or remotely control water injection and a stop so that water may be stopped.

It is preferable to use water, but a coolant may be used as a coolant, for example, by using a coolant of a rolling mill.

The scraper is installed in principle parallel to the roll axis and in contact with the full width of the roll. However, since it affects shape detection depending on the place of contact, it is necessary to provide in the site | part which does not affect shape detection. In the shape detection roll, although a plurality of detectable positions exist in the circumferential direction, it is necessary to prevent the scraper from coming into contact with other detectable positions when any detectable position touches the strip. For example, if 9 detection points exist every 40 degrees, the installation position of a scraper shall be installed so that it may not correspond to the position of the multiple of 40 degrees.

The material of the scraper is preferably a brush, rubber, or the like, and the thickness is preferably 25 mm or less because it does not affect the shape detection. Moreover, it is preferable to have a mechanism which can adjust the crimping force to a roll, and to be able to take out and attach from a side surface in order to make an exchange easy. Moreover, as long as the effect of this invention can be acquired, it may be a scraper by dehydration means, such as a roll and compressed air.

In addition, the longer the time before the water sprayed on the roll is dewatered, the higher the cooling effect is.

The present invention is particularly effective in a so-called high temperature rolling mill in which the maximum temperature of the strip is from 100 to 500 ° C. In such a case, the shape detecting roll becomes a high temperature, causing fixed adhesion of the rolled oil and penetrating into the gap on the surface of the shape detecting roll. By the method of this invention, if the shape detection roll temperature is kept at 300 degrees C or less, Preferably it is 250 degrees C or less, More preferably, it is 150 degreeC and 100 degrees C or less, and the said fixed adhesion can be prevented. Moreover, when the maximum temperature of a strip is 100 degrees C or less, since the influence of the fixed adhesion of a rolling oil, etc. is small, the effect of using this invention also becomes small.

<First Embodiment>

The countermeasure shown in Table 1 was taken about the shape detection roll provided in the cold rolling machine of a reverse line, and continuous operation was performed for about 3 months. The evaluation at that time is shown in Table 1. At this time, about half of the throughput was warm rolling, and the maximum temperature of the strip was approximately 400 ° C.

Facility measures evaluation Conventional No spray, no scraper × Reduced efficiency due to abnormal shape detection rolls. Measure 1 Spray only × The shape detection roll slips, affecting the peripheral measuring equipment by false detection and water splashing. Measure 2 Spray + Left Turn Scraper ○ The above problem is solved, but the cooling and cleaning effects are insufficient. Measure 3 Spray + left and right rotating scraper ◎ The problem is enough to solve, cool, and clean.

                                   ×: poor, ○: good, ◎: very good

The presence or absence of foreign matter fixed attachment in this gap can be evaluated by applying a constant load to the sensor and the ratio of the load detected by the sensor thereto. This is called factor value and is obtained by the following equation.

Factor = applied load ÷ detected load

This factor value is 1 or more, and larger than 1 shows that the foreign matter is fixedly attached to the gap. The new data of factor and the data after 3 months of use are shown in FIG. After 3 months of use, it can be seen that the factor is significantly increased in the vicinity of the center portion where the strip passes frequently.

In the countermeasure 1, since rolling was impossible by the slip of the shape detection roll and water splashing, as a countermeasure 2, the scraper was provided for dehydration at the time of left rotation. As a result, rolling was performed in the left rotational direction by spraying only during left rotation and dewatering with a scraper, but the factor value increased as shown in FIG.

Further, as a countermeasure 3, the scraper was added, sprayed by bidirectional rolling, and dewatered by the scraper to allow cooling and washing at all times during rolling, and to suppress the factor increase as shown in FIG.

According to the present invention, it is possible to provide a method of using the shape detection roll stably for a long time by always cooling and cleaning the shape detection roll during operation.

Claims (3)

Shape detection of cold rolling mill of metal strip The shape detection of the metal strip is performed by always spraying water from the outside during operation in the whole width direction of the roll, and contacting the scraper from the part where water was sprayed to the roll rotation direction exit side. How to use rolls. The method of using a shape detecting roll of a metal strip according to claim 1, wherein the cold rolling mill is a reverse line, and the scraper is provided at the inlet side and the outlet side in a roll rotation direction from a portion where water is sprayed. 3. Method according to claim 1 or 2, characterized in that the maximum temperature of the strip under rolling is from 100 to 500 ° C.

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