JPS58151903A - Method for grinding curved surface of rolling roll online - Google Patents

Abstract

PURPOSE:To reduce roll changing time and to roll a product to a desired shape by controlling the grinder built in a rolling mill in accordance with the storage of the roll profile during the initial rolling when the abrasion of the roll is small thereby grinding the roll to the roll crown right after the change. CONSTITUTION:The profile of the rolling roll between which a rolled material is nipped is actually measured or/and calculated in the initial period when the abrasion of the roll is small by making the positions corresponding to the longitudinal direction of the roll body. For example, the grinding wheels 3, 3' under revolution of grinder are brought into contact with the roll 1 under rolling, then the depth of cuts 7, 7' are adjusted forward or backward and the depth setting at which the wheels 3, 3' are pressed under the specified pressing pressure are determined. The depth positions of cuts in this stage are stored in a controller 5 by a computer. The wheels are then moved in the longitudinal direction X of the roll body at a specified extent and the depth positions Y of the grinding wheels corresponding to said positions are detected and stored. The respective detected points are connected, whereby the roll profile of a curved shape is accurately detected. Thereafter, the curved surface is ground at proper or periodically in accordance with the change in the roll profile.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an on-line surface grinding method for a rolling roll, and more particularly to an on-twin curved surface grinding method for grinding a roll during rolling by biting a rolled material.

As is well known, the rolling rolls installed in a rolling mill create a step at the boundary between the passing part and the non-passing part of the rolled material as rolling progresses. −
However, during the replacement of the four wheels, it is necessary to stop the rolling operation, resulting in a decrease in productivity. Recently, in order to solve this problem, a technology has been proposed in which a four-wheel grinding device is installed online and roll grinding is carried out online.

However, all of the above-mentioned proposals are aimed at eliminating or reducing the level difference occurring in the rolling roll, extending the life of the roll, reducing the number of roll replacements, and increasing rolling productivity. That is, the mode of four-wheel grinding is to perform smooth grinding, and the grinding is performed during idle time when the rolled material is not biting into the rolls.

For this reason, no consideration was given to changes in roll crown, and only a slight life extension effect was achieved. In other words, if the roll crown can be ground immediately after reassembly, the number of roll reorganizations can be significantly reduced and the product shape can be made into a desired shape.

As is well known, the rolling mouth sill originally has a predetermined crown shape, and during rolling, this roll is bent by rolling force, and the rolled material absorbs heat and causes thermal deformation (thermal crown). arise. Further, a bending force is applied by an active roll bending device, and these forces are combined to form a roll profile during rolling. That is, as shown in Fig. 1, a is the initial crown, b is the deformation due to rolling force (bending), and C is the thermal crown.The roll shape during rolling takes all of these into consideration, a + b + *, = The curved surface shape is d. Immediately after assembling a roll profile with such a curved surface shape, it is impossible to re-grind it online using the conventional method of smooth grinding during idle time. .

The present invention has been made to advantageously solve these problems, and its feature is that the profile of the rolling roll while biting the rolled material can be determined by actual measurement or calculation at an early stage when roll wear is low. Jlltt) Or, use a combination of actual measurements and calculations to determine the positional correspondence in the roll body length direction, store the determined profile in a grindstone cutting depth control computer, and roll based on the stored profile as rolling progresses. The present invention relates to a method for on-line surface grinding of rolls, which is characterized by grinding built into a machine.

Next, the present invention will be explained in detail using examples.

The schematic configuration of the online rule grinding device used to implement the method of the present invention is shown in FIGS. 2 and 3. That is, the grinding wheels 2 and 2 are in contact with the rolling roll 1 and are intended to maintain a constant distance between the grinding wheel 3 and the rolling roll.
', and a swing cylinder 4 and a rotating shaft 8 are arranged so that the mosquito touch rolls 2, 2' are always pressed against the rolling roll 1 with a constant pressure.
3' (both of which are shown in FIG. 3) are capable of high-speed rotation and forward and backward movement (cutting) independently.

Further, the grinding wheels 3 and 5'Fi are each mounted on one carriage 9 and can be moved parallel to the rolling roll axis at the same time, and the parallelism of the rolls in the height direction can be adjusted by means of the V-belling device 10. Auxiliary cylinder 16.16' is evening.

This is a cylinder for adjusting the stroke of Tyrol 2, 2'.

Before grinding, it is necessary to understand the roll profile during rolling. In other words, the roll during rolling is υ due to the rolling force.
Furthermore, the material to be rolled absorbs heat and undergoes thermal deformation, resulting in a screen shape in which the roll axis is bent, rather than in a flat state. For this reason, the roll profile during rolling is detected and stored at the beginning of rolling when roll wear is low.

Detection of a-roll profile during rolling//i There are two methods: actual measurement and calculating the roll profile using a computer by inputting conditions such as rolling force, temperature, roll material, etc. These methods can be used alone or in combination. I can do it.

In the present invention, a method for actual measurement will be explained.

The rolling rolls are relatively new and have not been worn out! A rotating grindstone 3.3' of a roll grinding device installed in a rolling stand is brought into contact with the roll 1 inside. Next, the depth of cut 7.7' is moved in and out to find the amount of cut that keeps the pressing pressure of the grindstones 6, 5' constant, and the cut position at this time is stored in the microcomputer controller 5 shown in FIG. . Next, by traversing a certain amount and repeating the same operation as described above, it is possible to detect and store 9) the grindstone cutting position Y corresponding to the position in the rubber X direction (0-L trunk length direction). By connecting these detection points, it is possible to accurately grasp the curved roll profile.

To detect the pressing pressure of the grinding wheel 3, if the hydraulic motors 11, 11' are used as the power for rotating the grinding wheel, a hydraulic meter, hydraulic pressure exchanger 14, etc. may be used; , just measure the current. Sho 12,
12' is a V-pulley, 13.13' is a V-belt, and 15 is a hydraulic unit. In this embodiment, as shown in FIG. 4, hydraulic stepping cylinders 7 and 7' are used for cutting and retracting the grinding wheels 5 and 6'. 2s by adding it to Ste, Ping Cylinder Drive Uni,) 6.6'
Unit stella/feeding is possible.

In this embodiment, a pulse generator (not shown) is used as a traverse position detector for the grinding wheel 5.3'.
By counting, the position in the X direction can be confirmed.

However, by moving the grinding wheels 6 and 3' independently, 9
The profile of the entire length of the rolling roll can be determined in one traverse. By appropriately setting the pressing pressure of the grindstone 3.6' and the hardness of the grindstones 6, 3', it is possible to perform highly accurate measurement within a few microns of the difference in roll profile Yrw4 during biting of one rolled material.

In other words, the actual roll profile measurement is shown in Figures 5 and 6.
As shown in the figure, by setting the measurement point to -n point in Figure 5, and further subdividing the measurement points as shown in Figure 6 and approximating by calculation, h
, it is possible to accurately determine the cutting position Y that is subdivided in the x direction. In this example, the grinding wheel width is 50 m and the measurement interval is 100 m.
■ Measure the profile by pressing the grindstone (Fig. 5), and then divide each measurement interval into 10 equal parts (Fig. 6) to calculate the
Cutting positions Y were determined at intervals of 0.0 cm. The obtained incision position Y was stored in the controller 5 in correspondence with the position in the body length direction of the rolling roll to determine the roll profile during rolling.

Note that the track M in FIG. 6 shows the actual roll profile at the measurement interval 100-.

The profile of the rolling roll with the curved surface shape has been determined in the above manner, and from now on, the curved surface will be ground periodically according to changes in the profile. In this case, the output of controller 5 should also be set to the pink cylinder drive unit. 6,6
In other words, the pin cylinder 7.7' is operated to designate the grindstone cutting position y' according to the grindstone traverse and move the grindstone to a predetermined position. In this example, the grindstone cutting position Y was designated by the controller 5 every 10 grindstone traverses, and curved surface grinding was performed (FIG. 6). In addition, when grinding, when the grinding wheel traverses back and forth once, the grinding wheel will wear out due to this reciprocation, so if the grinding was continued at the same cutting position, the distance between the grinding wheel and the rolling roll would gradually increase. It is necessary to cut in a certain amount.

Therefore, by cutting a certain amount (several μ) at the inner end of the traverse to draw the above-mentioned trajectory, it is possible to hold the roll 1:+ fill of the roll, which has a curved surface shape during rolling, on the roll crown near the roll change. can.

As explained in detail above, the method of the present invention changes the roll profile from time to time due to wear and thermal deformation as rolling progresses, with the roll profile having a curved shape due to bending pressure applied during rolling. Since it is possible to periodically re-roll the roll crown immediately after recombination, it is possible to achieve a fine grinding length for the roll life and to maintain a good profile of the rolled product. At Tonno, we installed a controller, stepping cylinder drive unit, step, and controller on the existing online roll grinding machine.
The present invention can be easily carried out by making some modifications to add a pink cylinder and a pulse generator, or something equivalent to these functions.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the profile of a rolling roll, Figs. 2 and 3 are explanatory diagrams showing the main part configuration of the online curved surface grinding device used in the implementation of the present invention, and Fig. 2 is a side view, 3
The figure is a front view. In addition, Fig. 4 is a diagram showing the configuration of an embodiment of the roll profile measurement and grinding wheel cutting control section, and Figs. 5 and 6 are diagrams showing the roll profile measurement and calculation approximation by subdividing the measurement points. FIG. 4 is an explanatory diagram showing a mode in which curved surface is ground by plow wheel cutting control for both the profile determination and the profile determined at the time of grinding. Applicant Nippon Steel Corporation Representative Patent Attorney Yanagi Minoru 2

Claims (1)

[Claims] Determine the profile of the rolling rail during biting of the rolled material by actual measurement or calculation, or by a combination of actual measurement and calculation, at an early stage when roll wear is low, by taking positional correspondence in the roll body length direction,
Storing the obtained profile in a grindstone cutting amount control computer,
It is characterized by controlling the depth of cut of a grinding wheel of a grinding device installed in the rolling machine in the roll body length direction based on the profile stored as the rolling progresses, and grinding to the same profile as the initial profile during rolling. On-twin curved surface grinding method for rolling rolls.