JPS60199509A - Method for measuring roll profile of mill roll - Google Patents

Abstract

PURPOSE:To perform precisely grinding operation by moving a grindstone of roll grinding device along the surface of a roll under a load smaller than that at the time of grinding and measuring a roll profile by recognizing the locus of grindstone. CONSTITUTION:The grinding wheel 4 of a roll grinding device 1 is rapidly moved in the direction of roll axis, by bringing the wheel 4 into contact with the surface of roll 2 under a pressing force necessary for merely keeping the contact by a hydraulic pressure smaller than that at the time of grinding the roll 2. In this way, the wheel 4 is moved along the roll 2 while scraping off a small amount of its surface by grinding. Accordingly, a roll profile is obtained from the locus of grinding wheel 4 with the aid of a controlling computer program, by monitoring a control signal to a pulse motor 12 and plotting its value at each point of the movement in the axial direction. Thus the grinding operation is precisely performed by said continuous measurement in the direction of roll axis.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a roll profile measuring method in roll grinding of a rolling mill, and particularly to a roll profile measuring method suitable for an apparatus that grinds a roll in-line without removing it from a stand. It is something.

(Bl) As the rolling process progresses, the part of the surface of the conventional rolling roll that comes into contact with the material to be rolled becomes deformed due to wear and tear. It is being done.

Conventionally, this grinding work was carried out by removing the roll from the stand, which caused the interruption of the rolling process, resulting in a decrease in work efficiency.
In order to lengthen the work cycle, use the so-called schedule EE rolling method, which involves rolling one stroke with a small fourth strip width.
It wasn't a child.

In order to solve the above-mentioned problem, the present applicant has developed C1i as needed in-line without removing the roll from the stand.
A method and device for removing 5 shavings were proposed.

(Japanese Patent Application No. 58-266345 〃 58-2RO6RO46 〃 5B-263347) This device has a roll chock in which rolling rolls are assembled and installed by 1 inch, and a rotating shaft that is approximately parallel to the axis of the rolling rolls. 0
It is a grinding wheel that is supported so that it rotates.
A six-wheel rotation drive, a drive device for pressing the grindstone against the rolling roll, and a moving device for moving the grindstone in the axial direction of the LE rolling roll σ, and a predetermined While grinding the roll surface, the grindstone moves in the direction of the roll axis so that the roll profile is the same as the grinding + j! Since it is proportional to the product of the load on the drive motor due to grinding and the grinding time,
Adjustment is made by controlling the drive device and the axial movement speed.

FIG. 1 is a schematic diagram of the roll<p+ grinding device 1 used in the present invention, in which 2 is a work roll, a roll chock, 4 is a grinding wheel, 5 is a grinding wheel rotation drive motor, and 6 is a grinding wheel rotation drive motor. A driving spline shaft, a movable element which is attached to the spline shaft and moves in the direction of the arrow 1; 8 is a movable body to which the grinding wheel 4 is attached and moves together with the movable element 7; 9 is a movable element such as the movable element 7; Hydraulic piston for axial drive,
10 (front grindstone) is a reduction gear of the pulse motor 12 that rotates the eccentric body 11 for pressing the wheel 4 against the work roll 2.

FIG. 2 is a diagram showing how the roll f'iJi grinding device i-'' shown in FIG. 1 is installed on a stand. The numbers in the figures indicate the same parts as the parts with the same numbers in FIG.

Now, using such a roll Φ1 grinding tool, grinding is performed to obtain a predetermined roll profile as described above.For this purpose, the roll profile before ω1 grinding is set to 61'+. It is necessary to calculate the difference between the σ1 and the predetermined roll profile, and cut and install the roll I11 according to that pattern.

Conventionally, as such a roll profile measuring device, there is, for example, a differential transformer type profile meter, which has a plurality of differential transformers 31 arranged for the tkl and direction traps of the work roll 2, as shown in FIG. Then, the roll profile d is determined using changes in the visiting electromotive force due to changes in the position of the malleable iron core, that is, the probe 62 in the coil. However, as is clear from the figure, there is a limit to the number of sensors that can be arrayed due to the width occupied by a single differential transformer sensor, and the number of sensors that can be arrayed is limited.
The pitch was usually about 60 #lJ.

This was a problem because it was impossible to measure the cumulative pressure of the roll profile. In addition, the rolling stand has a complicated arrangement around the rolls 1, and together with the color roll cutting device a for the present invention as shown in FIG.
It was difficult to install the lli constant device ζ, and there were also problems in terms of maintenance and operation of the device.

(Ul Invention σ) Purpose The purpose of the present invention is to solve the above-mentioned problems and provide a method for continuously and unobtrusively measuring the roll profile.

(Di) Structure of the Invention The roll profile measuring force method according to the present invention uses a grinding wheel supported to rotate around an axis substantially parallel to the rolls of a rolling mill, A motor, a drive device that presses the grinding wheel against the roll, a moving device i that moves the grinding wheel in the axial direction of the roll, and a device i that detects the load on the rotary drive motor.
! 1', and according to the detected negative force, the Ai+ pressure contact driving device 1b11 is used to control the moving device 6°.
A roll having a tall m device (in a VL cutting device, the grinding wheel is brought into contact with the roll surface while rotating, and the load on the rotary motor is set to a predetermined value smaller than the load on the roll milling device. The roll profile is measured by moving the whetstone in the axial direction while bending it toward the roll surface, and recognizing the locus of the whetstone from the change in the whetstone IF contact control at that time. , the roll profile of the rolling mill roll ill'i crown method.

That is, this method attempts to achieve its purpose by utilizing the above-mentioned roll grinding device without using a special roll profile 61 setting device.

(Example) The specific device for carrying out the method of the present invention is the device shown in FIG. The grinding wheel is operated at a speed of approximately 20 rpm by receiving hydraulic pressure from a hydraulic source (not shown).
001! ! Make a J turn.

This motor σ) hydraulic system is equipped with an oil pressure detector, which detects changes in oil pressure according to the load applied to the motor when the grinding wheel 4 comes into pressure contact with the roll, and transmits the change to the control device. . The axial movement device is the oilfield piston 9 in Fig. 1, and the roll (when cutting υ1
The grinding wheel is moved over a width of about 600 Jla at a speed of about 100 ml. The device that presses the grinding wheel against the roll is a pulse motor 12 and an eccentric body 11 that is rotated by the pulse motor 12 around an eccentric shaft. The pressure contact force is automatically stabilized within a predetermined range.

Furthermore, this device includes a computer system that controls the various devices as a whole, and controls the roll grinding device Ai+ based on the difference between a predetermined roll profile and a measured roll profile before cutting. Then, remove the roll by ρ1 and correct the wear on the roll surface.

Since the amount of grinding is proportional to the product of the zero pressure contact force of the grindstone and the grinding time, the amount of grinding is controlled using the pressure contact force control using the load σ) detected by the hydraulic pressure sensor on the rotary drive motor, and This is done by controlling the moving speed by controlling the hydraulic pressure Hi of \, and this is controlled as a whole according to the required amount of the roll profile of 6iJ.

In the method of the present invention, using a roll grinding device as described above, the grinding wheel is first set to a smaller hydraulic pressure than that during roll grinding, for example, a rotary drive motor σ) with a hydraulic pressure of 4 Kq/, cm.
The grinding wheel is brought into contact with the roll surface with a force of 2 or less, which is almost as strong as when the grinding wheel is in contact with the roll surface, and the roll is moved in the axial direction of the roll at a faster speed (approximately 300 aJ/min) than during grinding while maintaining that pressure. This situation is shown in FIG. In the figure, the X-axis direction indicates the distance O, which is the grinding start point of the roll,
The Y-axis direction is the radial distance of the roll. In this figure, each part is emphasized for ease of viewing, and the dashed line in the figure is the predetermined roll profile after cutting.

By doing so, the grinding wheel moves along the profile of the roll while grinding the surface of the roll by a very small amount (approximately 6 to 5 microns). Therefore, if the locus of the grinding wheel at this time is recognized, it is the roll profile before machining. This recognition can be achieved, for example, by monitoring the operation of the construction method drive device, that is, in the embodiment, by monitoring the control signal to the pulse motor 12 and plotting its value at each point of axial movement. This can be carried out using the control computer system, and in actual tests, the axial movement speed is 300*J/min, the rotary drive motor oilfield 4K
When the trajectory was sampled every second under g/crn2 or less control, the difference between the recognized roll profile and the actual roll profile, that is, the recognition error, was ±4 μm.

[F] Effect By realizing the method as described above, the present invention has the following effects:
Since the roll profile can now be measured without the need for a special profile meter, the structure around the stand has become simpler and maintenance has become easier. Furthermore, since it has become possible to measure continuously in the roll axis direction, the roll profile can be recognized more precisely, and therefore, the precision of ω1 cutting work has been realized.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view of a roll grinding device used in the present invention. FIG. 2 is a perspective view showing how the roll cutting device of FIG. 1 is installed on a stand. FIG. 3 is a schematic diagram showing a conventional differential transformer type roll profile measuring device. FIG. 4 is a conceptual diagram of the implementation of the method of the present invention. DESCRIPTION OF SYMBOLS 1... Roll grinding device, 2... Work roll, Roll... Roll chock, 4... Grinding wheel, 5... Grinding wheel rotation drive motor, 6... Drive spline shaft , 7... Mover, 8-mounted moving body, 9... Hydraulic piston, 10... Reduction gear, 11... Eccentric body, 1
2... Pulse motor, 16... Differential transformer, 62
...probe. Patent applicant Sumitomo Metal Industries Co., Ltd. Agent Patent attorney Kyo Yuasa =・1-1□-” (4 others) Figure 3 Figure 4

Claims (1)

[Scope of Claims] A grinding wheel supported at 5 to rotate around an axis substantially parallel to the axis of a roll of a rolling mill, a rotary drive motor for rotating the grinding wheel, and a rotation drive motor for rotating the grinding wheel; a driving device that presses the grinding wheel to the roll; a moving device that moves the grinding wheel in the axial direction of the roll; a device that detects the load of the rotary drive motor; and a device that moves the pressing drive device in accordance with the detected load.
In a roll grinding device having a control device for controlling the moving device, the grinding wheel is brought into contact with the roll surface while rotating, and the load of the rotary drive motor is reduced to a predetermined value smaller than the load during roll grinding. The roll profile is measured by moving the grindstone along the roll surface in the axial direction while controlling it to traverse, and recognizing the locus of the grindstone from the change in the pressure contact of the grindstone at that time. 6. Rolling How to measure the roll profile of one roll.