JPS59199107A - Method for grinding roll of rolling mill - Google Patents

Abstract

PURPOSE:To grind a rolling roll into flat without dismounting the roll from a mill by grinding the roll by a belt grinding device capable of controlling the speed of a grinder moving on the roll surface in the longitudinal direction of roll, a force for pressing the grinder against the roll, and the speed of the grinder itself. CONSTITUTION:The surface of a rolling roll 11 is ground into a flat one by pressing a belt grinder 12, rotated endlessly by a driving roll 16, against the ruggedly formed surface of the roll 11 by a touch roll 13. In this case, a grinding device is attached onto a slider 18 which moves the device in the radial direction of roll 11, and the slider 18 is also attached onto a slider 19 which moves in the axial direction of roll 11. Thus the surface of roll 11 is ground into a flat one without dismounting the roll 11 from a mill, by moving the device on the roll 11 surface along the roll 11 axial line from one end to the other end thereof, and controlling the speed of belt grinder 12, its moving speed in the roll axial direction, and a force for pressing it against the roll 11 in accordance with the surface ruggedness of roll 11.

Description

Detailed Description of the Invention [Field of Application of the Invention] The present invention relates to the repair of (2) expropriated rolling equipment such as plate mills, hot strip mills, and cold strip mills. The present invention relates to a roll grinding method for a rolling mill, in which roll grinding is carried out uniformly during rolling while the roll is placed in the rolling mill.

[Prior art]

In general, the rolling rolls of a rolling mill experience uneven wear in the axial direction of the roll at the contact area between the rolled material and the rolling roll.

For this reason, in rolling, the so-called rolling order regulation has been implemented, which regulates the width of the strip from wide to narrow strips in the rolling order, but in recent years,
In order to save energy, sushi pieces produced by continuous casting are put into a heating furnace as hot pieces, and a method of rolling them directly without passing them through the heating furnace has begun to be adopted, and the conventional rolling order regulation based on plate width has been abolished. Strong demands.

Instead of regulating the rolling order, a method has recently been proposed in which uneven roll wear is made uniform by grinding it with a grinder during rolling. Specifically, (a), the flat grindstone 30 is rolled by the hydraulic cylinder 31.
2 and grind using the rotation speed of the roll (
Figure 1).

Φ) 8 Disc-shaped grindstone 33 like the one used for normal roll grinding
'f: Rotate and press against the roll 32 (Fig. 2).

That is what it is.

However, in (a), the relative deviation difference between the roll and the grinding wheel is only the rotational speed of the roll, so the grinding efficiency is poor and the effect is only as good as the surface finish of the roll, so it is not suitable for grinding uneven wear. It cannot be said to be particularly effective. In addition, in method (1)), the diameter of the grinding wheel must be approximately φ300 to φ400 due to installation space limitations. If the diameter of the grinding wheel is smaller than the diameter of the roll, the grinding will be unstable, and the There are practical problems such as a phenomenon called "patt-taki" occurring between the rollers and the roll being ground into a polygonal shape.

As an alternative to the two methods (a) and (1), a method using a belt grinder 7, which has been used for polishing metal utensils, kitchen knives, etc., has been developed (e.g., JP-A-56-331).
No. 06, etc.), but in this one, the belt fat is equal to or larger than the width of the work roll, and the grinding device is movable only in the radial direction of the roll. That is, the belt cannot be moved in the roll axis direction. Therefore, the uneven wear curve of the roll 32 remains as it is, and as shown in Figure 3, the uneven wear curve of the roll 32 is simply moved in parallel by the belt V from the surface R0 before grinding to the surface mR2 after grinding. this is,
Figure 3 shows an exaggerated amount of wear on the rolls, but the actual amount of wear is 2 to 3μ per rolled material, and even at the end of one schedule it is about 200 to 300μ, and the belt grinder roll This is because it follows the surface shape. Therefore, it is difficult to eliminate roll wear that is unevenly distributed in the roll axis direction by grinding.

In addition, in the case of such a so-called full-width belt, when the belt is pressed, the force acts only on both ends of the roll, and the belt is pressed against the center of the belt (
When the belt is pressed at the center of the roll, the contact wheel axis is bent, and the pressing force at the center of the roll is too small compared to both ends, and the six times the roller is ground forms a chevron shape.

Furthermore, in the case of a full-width belt, the capacity of the drive source is limited, and the space required to install the grinding device is large.Currently, space is not an advantage when installing a kite in the housing, a rudder for cooling water, a lubricating oil header, etc. It's not more than 1.

By the way, when we investigated the wear status of rolling rolls during rolling, we found that the roll wear curve after a normal rolling schedule in which the plate width is regulated and shifts from wide material to narrow material is as shown in Figure 4. It was observed that the roll wear curve after removing the plate width restriction and continuously rolling only the same width material was as shown in Figure 5. So, by comparing these, we found the following.

(1) When the plate width is regulated, the width of the rolled material is always narrower than that of the front plate, so it is possible to perform rolling on the flat part at the bottom of the worn roll.

(2) If the 6-plate width restriction is abolished, the uneven part of the roll wear curve will increase, and the tapered part will increase dramatically. If rolling is continued in such a situation, the deviation in thickness of the edge of the plate rolled at the tapered portion will become large, causing a defective shape.

[Purpose of the invention]

The present invention focuses on the above-mentioned points, and provides a roll grinding method for a rolling mill that can eliminate uneven wear of the rolls caused by rolling during rolling and that enables rolling with a flat roll surface at all times. The purpose is to

[Summary of the invention]

In the roll grinding method for a rolling mill according to the present invention, a belt grinder is press-fitted to the boundary between the working area near both ends of the rolling roll while moving in the axial direction of the rolling roll, thereby reducing roll wear that grows as the pressure plate increases. It is made to be uniform in the roll axis direction.

A specific method for uniformizing roll wear in the axial direction is to control the belt speed by increasing or decreasing the belt speed according to the amount of wear on the tapered roll while moving the belt grinder device in the roll longitudinal direction. It is preferable that

It is also effective to control the speed of movement of the belt grinder in the longitudinal direction of the roll depending on the wear amount of the tapered roll while moving the belt grinder in the longitudinal direction of the roll.

Furthermore, it is also effective to control the pressing force of the belt grinder device in the direction of the roll while moving it in the longitudinal direction of the belt grinder 5i-tk depending on the wear amount of the tapered roll.

A first embodiment of the present invention will be described below with reference to FIGS. 6 to 10.

First, an apparatus for carrying out the method of the present invention will be described.

Note that the control device 61 for the upper and lower rolls has a symmetrical configuration on the upper and lower sides and the operation/drive side 9.0, so either the upper operation side or the drive side will be explained.

The belt grinder device is a belt grinder (hereinafter simply referred to as belt) 12 that comes into contact with a rolling roll 11.
A touch row 213 for pressing the belt 12 against the roll 11, a tension roll 14 for applying tension to the belt 12, a spring 15 for pushing up the tension roll 14, and a driving roll 16 for driving the belt 12′f. , and a driving variable speed motor 17. These components are mounted on a radial slide 18 that is movable in the radial direction of the roll, and this radial slide 18 rests on an axial slide 19 that is movable in the axial direction of the roll. Radial slider 18
is pressed against the roll side with a constant load by a cylinder 20 fixed to the axial slider 19, giving the belt 12 a cut into the rolling roll. In addition, the axial slider 19
is moved by a cylinder 22 on a rail 21 installed between the housings of the rolling mill. The moving distance of the axial slider 19 is detected by a magnetic scale 23 installed between the rail 21 and the axial slider 19.

By the way, the axial slider 19 receives position feedback from the servo valve 24 and the magnetic sensor, that is, receives the roll axial movement command S1, and then moves forward in the axial direction on the roll surface by the cylinder 22 at a constant speed. ing.

Here, FIG. 8 shows the relationship between belt speed and roll grinding amount. It can be seen from the figure that the amount of roll grinding increases in proportion to the belt speed. Therefore, as shown in Figures 9 and 10, if the belt speed is changed according to the amount of roll wear that is unevenly distributed in the longitudinal direction of the roll, the rolling roll surface FL1 will change as shown in Figure 13. It is possible to grind to a flat surface R2.

Therefore, the belt 12 shown in Fig.
The relationship between the speed and the amount of grinding is stored in the host computer 25, and the belt speed is adjusted as shown in FIGS. A rotation speed command S is given to the variable speed motor 17 in order to change the rotation speed, thereby making it possible to perform uniform grinding along the axial direction of the mill roll.

Next, a second embodiment of the present invention will be described with reference to FIGS. 11 to 13.

In this embodiment, the axial slider 19 is moved in the axial direction on the roll surface by the cylinder 22 while receiving positional feedback from the servo valve 24 and the magnetic sensor as in the previous embodiment.

Here, FIG. 12 shows the relationship between the amount of grinding by the belt grinder and the time. From the diagram 1'oJ, it can be seen that the amount of grinding increases in proportion to time, excluding the 5 minutes from the start of grinding. Therefore, as shown in Fig. 13, by changing the moving speed of the belt grinder in the roll axis direction according to the amount of roll wear that is unevenly distributed in the roll axis direction, and grinding the parts with less wear for a long time, the roll It is possible to grind the surface to a flat surface.

Therefore, the relationship between the wear curve of uneven roll wear caused by rolling a single rolled material of the width of the pipe plate, and the belt grinder grinding time and grinding amount shown in FIG.
5, and in order to change the moving speed of the axial slider 19 as shown in FIG. 13 while making the belt grinder position obtained from the magnetic sensor 23 correspond to the signal S2 in the lower control device 26, the cylinder is connected to the servo valve 24. 22, thereby making it possible to perform uniform grinding along the axial direction of the mill roll.

Next, a third embodiment of the present invention will be described with reference to FIGS. 14 to 16. In this embodiment as well, the axial slider 19 receives position feedback, that is, the roll axial movement command S□, from the servo valve 24 and the magnetic sensor, and is always reciprocated in the axial direction on the roll surface by the cylinder 22 at a constant speed. It has become.

Here, FIG. 15 shows the relationship between the amount of grinding by the belt grinder and the pressing force. From the figure, it can be seen that if the portions where the pressing force is small are excluded, the amount of grinding increases in proportion to the pressing force in y. Therefore, as shown in Fig. 16, the belt winder is
By changing the pressing force on the roll side of A'III and grinding with the least worn part as the pressing force dog, the roll surface R1
It is possible to grind to a flat surface Il(,2).

Therefore, the upper computer 25 calculates the relationship between the wear curve of uneven roll wear caused by rolling a single rolled material of various widths, the pressing force of the peltge 2 inder, and the amount of grinding as shown in Figure 15.
The pressure signal S4 is given to the proportional electromagnetic pressure reducing valve 27 on the radial slider pressing cylinder 200A side while being stored in the lower control device 26 and corresponding to the belt pressure cylinder position number S2 obtained from the magnetic sensor 23. The cylinder pressure is controlled to control the pressing force in the radial direction of the roll, thereby achieving uniform grinding along the axial direction of the mill roll.

Next, a fourth embodiment of the present invention will be described with reference to FIGS. 17 and 18.

In the embodiment, the belt movement is the same as in the first to third embodiments
In addition, the grinding section is provided with an oscillating machine 40 consisting of an oscillating slider 41 and an oscillating cylinder 42 for performing an oscillating motion. This rock @ 4
4:' structure allows the belt 12 to perform a swinging motion of a predetermined stroke in the direction of the roll axis, while performing a grinding action by the belt movement.

According to this flexible device, even more flat grinding can be achieved by swinging the belt 12.

[Effect of C% lightening] As described above, according to this lightening method, it is possible to uniformly grind the uneven part of the roll 9 mm continuously in response to the wear of the rolls in the threading section. An excellent effect is achieved in that rolling can always be performed on the flat roll side without the influence of edge drops of the material.

-i:/, a narrow 11-gauge belt is sufficient, so Sen+'
+'J The power required is small, and the equipment used can be made more compact.

[Brief explanation of the drawing]

Note 11 AI and Figure 2 show different conventional examples respectively - Outline h=,;r::3 A further different example of the conventional example is shown. Characteristic diagram showing the amount of roll wear depending on the rolling schedule, ='
? 5 is 1 (zu: Board 1 posting regulation rlilJ is withdrawn i5A,
Rolling of only the middle material is carried out, and the amount of wear of the rolls is not shown. So, i♀; 6 [71
FIG. 7 is a front view of the i-ma grinding device, FIG. 8 is a characteristic diagram showing the +N relationship between the speed of the belt grinder and the amount of roll grinding, and FIG. 9 is a schematic diagram showing the roll surface. 10th
The figure shows an example of the belt speed. Figures 11-37
g Figure 13 (d: Shows the second embodiment of the present invention,
Figure 111 is a schematic plan view showing the control device, EN 11 Figure CB) is a front view of the same Figure 21312 is a percentage factor showing the relationship between belt grinder grinding time and roll grinding amount, and Figure 13
Figure (4) and ■ are schematic diagrams showing an example of the belt surface and roll direction movement speed, and Figures 14 to 16 are the third embodiment of the present invention.
Fig. 14 (G) shows a schematic thousand-sided view of the control device, Fig. 14 (■) shows a front view of the same, and Fig. 15 shows the relationship between belt pressing force and roll grinding amount. Characteristic diagram, No. 16
Figure 17 is a schematic diagram showing an example of the belt surface and pressing force, and Figure 17 is a plan view showing a fourth embodiment of the present invention.
FIG. 18 is a front view of the same. 11...Roll, 12...Belt comb winder, 13
... Tatsuteroshi, 14 ... Tension roller, 1
5...Spring, 16...h'ah loan, 17
... (variable speed) motor, 18... Radial direction sushider, 19... Axial direction sushider, 20... Cylinder, 2
DESCRIPTION OF SYMBOLS 1...Rail, 22...Cylinder, 23...Magnetic sensor, 24...Servo valve, 25...Upper computer, 26...Lower control panel, 27...Proportional magnetic pressure valve . Senior 1 Sec. 2 Sec.

Claims (1)

[Claims] In a roll grinding method for a rolling mill in which a rolling roll of 16-rolled material is ground by belt grinders installed on the operating side and the driving side of a housing, the grinder is used to grind a rolling non-operating area near both ends of the rolling roll. A roll grinding method for a rolling mill, characterized in that the roll is pressed against the boundary between the working area and the central part of the roll while moving in the axial direction of the roll, and the wear of the roll that grows as the rolling plate is made uniform in the axial direction of the roll. . 2. The scope of the patent is characterized in that the axial uniformity of roll roughness is achieved by controlling the belt speed of a belt grinder depending on the parts of the rolling roll that are more worn and the parts that are less worn. The rolling described in item 1; six rolls and other mechanical rolling. 3. The scope of the present invention is characterized in that roll wear can be made more uniform in the axial direction by controlling the moving speed of the belt grinder in the roll axial direction depending on the parts of the rolling roll that are more worn and the parts that are less worn. The method for grinding rolls in a rolling mill according to item 1. 4. The roll wear is made uniform in the axial direction by controlling the pressing force of the belt grinder against the roll depending on the parts of the rolling roll that are more worn and the parts that are less worn. A roll grinding method for a rolling mill according to item 1. 5. The belt grinder is characterized in that the belt grinder is configured to be oscillated in the roll axis direction at a predetermined stroke by a vibration mechanism, thereby imparting a roll and other agent action. 2. The method for adding a roll to a rolling mill according to any one of the above.