JPS63183708A - In-line grinding device for work roll - Google Patents

Abstract

PURPOSE:To control grinding amounts and to perform continuous grinding by connecting a highly pressurized water generation device to nozzles movable in the axial direction of work rolls and injecting the water onto necessary parts for grinding. CONSTITUTION:Nozzles 7 having a header 6 are supported by a supporting device 9 and are movable in the axial direction of work rolls 2 by a mover device consisting of a motor 12, etc., and are connected to a highly pressurized water generation device 8 consisting of a hydraulic unit 14 and a booster 15, etc. A roll profile is detected by a prescribed sensor and the roll is ground to remove a step between worn parts and nonrolling parts of the roll with a highly pressurized water of an injection pressure of >=3000kg/cm<2> injected from a distance of 5-30mm. Thus, grinding amounts are controlled and the grinding is continuously performed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an in-line grinding device for work rolls.

[Conventional technology]

Conventionally, as described in Japanese Unexamined Patent Publication No. 59-12300, a grinding belt has been rotated and pressed against a work roll, or split and fixed abrasive stones have been pressed against a work roll. These are difficult to recognize in the current state due to wear and tear of the abrasive, clogging, and minute fluctuations in the abrasive pressing direction due to radial gaps in the work roll bearings and gaps in the stand of the bearing box, and changes in the amount of grinding due to changes in the pressing force. Therefore, there were problems such as difficulty in grinding according to a predetermined amount of grinding.

[Problem that the invention seeks to solve]

The above-mentioned conventional technology is characterized by changes in grinding capacity due to wear or clogging of the abrasive material (grinding belt or grinding wheel). Because it is difficult to sulfur, it is difficult to grind to the desired amount. In order to maintain the grinding ability, it is necessary to replace the abrasive at an early stage, but there is a problem in that replacing the abrasive takes a lot of time.

The present invention has been made in view of the above points, and an object of the present invention is to provide an in-line grinding device for work rolls that is capable of controlling the amount of grinding and is capable of continuously carrying out grinding. It is something to do.

c. Means for Solving Problems] The above object is to provide a grinding means which is disposed opposite to a work roll with a predetermined gap therebetween, a movable nozzle having a header, and a movable nozzle which is moved in the axial direction of the roll. This is achieved by comprising a moving device, a profile recognition device that recognizes the profile of the roll and controls cutting, and a high-pressure water generator connected to the nozzle via piping.

[Effect]

The nozzle that sprays high-pressure water onto the area on the surface of the work roll that requires grinding is positioned in the spray direction and moves in the roll axis direction, so by rotating the work roll, high-pressure water is sprayed over the entire surface of the roll that requires grinding. be done. Therefore, the surface of the roll is ground, but since high-pressure water at a constant pressure is always supplied to the nozzle from the high-pressure water generator, the grinding ability is always constant.

By moving the nozzle cyclically over a certain range, it is possible to grind only the necessary area, and by changing the movement distance of each cycle, it is possible to grind the surface of the roll to an arbitrary profile. In this way, it is now possible to inject high-pressure water to all necessary parts to avoid any difference in level between the parts caused by rolling wear of the work rolls and the non-rolled parts, making it possible to implement rolling schedule-free operations. Materials with good shapes can be rolled.

Since the rolling wear level difference is eliminated, the rolling time of the same work roll can be extended, the work roll change cycle is extended, and rolling with d'I+ efficiency can be achieved.

〔Example〕

The present invention will be described above based on the embodiment shown in FIG.

An embodiment of the present invention is shown in FIGS. 1 and 2. FIG. As shown in the figure, a work roll 2 installed in a mill stand 1 constitutes a work roll assembly with a work roll bearing box (not shown), and is sized in the roll axis direction by a roll shift device 3. Click-shifting is performed to disperse edge wear of the rolled material 4. The work roll 2 is connected to a spindle 5 and driven by a mill motor (not shown).

With this structure, the work roll 2 in the mill stand 1
This is an in-line grinding device for a work roll 2, which is provided with a grinding means for online grinding, and in this embodiment, the grinding means is arranged opposite to the work roll 2 with a predetermined gap therebetween, and is a movable nozzle having a header 6. 7, a moving device that moves this nozzle 7 in the axial direction of the roll 2, and a moving device that moves the nozzle 7 in the axial direction of the roll 2.
The machine consists of a profile recognition device that recognizes the profile of the machine and controls cutting, and a high-pressure water generator 8 connected to the nozzle 7 via piping. By doing this, the amount of grinding can be controlled and grinding can be performed continuously. In-line grinding equipment can be obtained.

That is, although a moving device, a profile recognition device, and a high-pressure water generating device are provided, a supporting device 9. which supports the moving device, supports the header 6, and supports the nozzle 7 at a predetermined position facing the work roll 2. Screw 10 connected to header 6. A motor 12. connected to this screw lO via gears 11 and lla. It is connected to this motor 12 and consists of a sershin transmitter 13 that recognizes and controls the movement amount and position of the nozzle 7,
The nozzle 7 is moved cyclically and by changing the moving distance. i.e. header 6 with nozzle 7
is held at a certain distance on the surface of the work roll by the support device 9,
so that it can be sprayed onto the work roll surface, and the screw 10
combined with. The screw 10 is connected by a motor 12 and a gear 11.
The movement location and position are recognized and controlled by the Sershin transmitter 1 and 3. As the screw 10 rotates, the header 6 and nozzle 7 move in the roll axis direction. Further, by installing the nozzle 7 and the header 6 at two opposing positions on the edge portion of the rolled material 4, the rolled material 4 can be
It is possible to grind the edge wear step. Furthermore, by continuously arranging the nozzles 7 at positions facing one work roll 2, grinding can be performed over the entire length of the roll body.

+I'b pressure water generator 8 is connected to hydraulic unit 14. A pressure intensifier 15 connected to this hydraulic unit 14. A water supply unit 16 that supplies water to this f/f intensifier 15. The accumulator 17 is connected to the pressure intensifier 15 and equalizes the pulsating high-pressure water increased in pressure by the pressure intensifier 15.

That is, the high pressure water generator 8 is connected to a hydraulic unit 14° pressure intensifier 15. A water supply unit 16, an accumulator 17, etc. form an oval structure, and the piston of the pressure intensifier 15 is reciprocated by the power of the hydraulic unit 14, and water is supplied from the water supply unit 16 to the pressure chambers at both ends of the piston. The pressure of the supplied water is increased by the pressure intensifier 15, and the water is alternately supplied to the accumulator 17 from the pressure chambers at both ends of the piston.

This pulsating high-pressure water is leveled by an accumulator 17 and supplied to the nozzle 7 through piping. According to this high-pressure water generator 8, ultra-high pressure water can be obtained from the low-pressure water supply unit. If high-pressure water is injected from the high-pressure water generating device 8 through the piping and from the nozzle 7 of the header 6 to an arbitrary position on the surface of the work roll 2, the injection site is ground.

Next, an example of roll grinding will be explained. As shown in Figure 3, which shows the roll surface and cross-sectional shape of the rolled material of a rolling mill that does not have an in-line grinding device, the conventional rolling mill (4H Due to its worn shape, schedule-free rolling was not possible with the mill), and a coffin-shaped rolling schedule was forced.

Due to the coffin shape, it is necessary to replace the work roll. In a rolling mill equipped with a shift device for moving the work roll cycle shown in the upper row of the figure, as rolling wear progresses, edge drop becomes larger for wide materials, creating a problem with true schedule-free operation, and in this case, the work roll must be replaced. It is.

As shown in FIG. 4, which shows the parts to be ground by the in-line grinding of this embodiment, compared to the conventional example shown in FIG. ), a flat plate-shaped rolled material can be obtained by grinding the ground part shown at the dot in the figure.

True schedule-free rolling is now possible, and rolling can continue with a pair of work rolls. Therefore, it is possible to extend the recombination cycle of the work rolls and to roll the product into an excellent shape.

In this case, as shown in Figure 5, which shows the relationship between grinding capacity and spray distance, the grinding capacity will increase if the nozzle is set in the range of 5 to 30 mm, so set the nozzle at an appropriate position. It is important to set But this 5
Since the difference is small for minute changes within the range of 30 m+++, the grinding ability is not affected by minute movements of one work roll.

Further, the grinding ability can be increased by arranging a multi-hole nozzle in one header or by increasing the injection pressure as shown in FIG. Furthermore, the movement of the nozzle allows grinding of various profiles. Figure 6 shows the relationship between grinding capacity and injection pressure, and the practical range is 3000 kg/a.
Although a pressure of m2 or higher is desirable, pressures higher than that can also be put to practical use by mixing the abrasive material into high-pressure water and injecting it.

As shown in FIG. 7, a reference portion 18 without roll grinding is provided with a profile recognition device at both ends of two work rolls 2.
, a sensor mounting bracket 20 having a reference roller 19 disposed on this reference portion 18 via a reference roller 19, a frame 21 connected to this bracket 2°, and a frame 2J connected to this frame 21 and driving the frame 2J toward the work roll side. A cylinder 22 is attached to a sensor mounting bracket 20, and is formed by a central part outer circumferential position detection sensor 2 for detecting the outer circumferential position of the body of the work roll; did. That is, a reference portion 18 that is not subjected to roll grinding is provided at both ends of the body of the work roll 2, and a reference roller 1 is provided on one side of this portion.
A sensor mounting bracket 20 having a number 9 is disposed, and a frame 21 connected thereto is configured to be pressed against the work roll 2 by a cylinder 22. A sensor 23 for detecting the center outer circumferential position of the roll body corresponding to the center of the rolled material 4 is attached to the sensor mounting bracket 20, and a grinding section outer circumferential position detecting sensor 24 is attached to the grinding part of the roll grinding area.

By doing this, the sensor mounting bracket 20 also moves to follow the slight movement of the work roll 2, so not only can accurate position detection be performed at all times, but also the center outer circumferential position detection sensor 23 and the outside of the grinding part Peer 1α detection sensor 24
Efficient grinding can be performed by calculating the difference between the measured values and grinding by this amount. In addition, this sensor 23
, 24 in the roll axis direction, the profile of the work roll 2 can be checked at all times, and by using this together with the movement of the nozzle, in-line grinding of the profile at the position of the work roll 2 can be performed.

In this way, according to this embodiment, the grinding of the work roll 2 can be carried out while the grinding capacity continues during rolling in the mill stand, so that the target work roll profile can be constantly formed and the rolling can be carried out at Therefore, the best effect can be achieved in schedule-free rolling, and since it is no longer hindered by roll cooling caused by rolling, the rolling time on the pair of work rolls 2 can be extended.For this reason, the work roll change cycle can be extended. This improves the actual operating rate and enables highly efficient rolling.

Furthermore, since the desired work roll profile can always be ensured, it is possible to effectively roll products with good shapes.

〔Effect of the invention〕

As mentioned above, the present invention makes it possible to control the amount of grinding and to carry out grinding continuously, making it possible to control the grinding section and carry out grinding continuously. An in-line grinding device for work rolls can be obtained.

[Brief explanation of the drawing]

Fig. 1 is an overall system diagram showing the overall configuration of an embodiment of an in-line grinding device for work rolls according to the present invention, Fig. 2 is a horizontal sectional view of the same embodiment, and Fig. 3 is a conventional in-line roll grinding device. Explanatory diagram showing the work roll surface and plate cross-sectional shape of a rolling mill without a rolling mill and a rolling mill with cyclic movement of the work roll, FIGS. 4(a) and 4(b) show the roll surface grinding part and plate cross-sectional shape. (a) is an explanatory diagram for the conventional example, (b) is an explanatory diagram for the present embodiment, Fig. 5 is a characteristic diagram showing the relationship between injection distance and grinding capacity, and Fig. 6 is a diagram showing the relationship between grinding capacity and injection pressure. A characteristic diagram showing the relationship, FIG. 7 is a plan view of a profile recognition device of an embodiment of the in-line grinding device for work rolls of the present invention. 1... Mill (rolling machine) stand, 2... Work roll, 4... Rolled material, 6... Header, 7... Nozzle, 8...^ Pressure water generator, 9...・Support device, 10・
...Screw, 11, lla...Gear, 12...
Motor, 13... Sershin transmitter, 14... Hydraulic unit, 15... Pressure intensifier, 16... Water supply unit,
17...Accumulator, 18...Reference part, 19.
...Reference roller, 20...Sensor mounting bracket,
2]...Frame, 22...Cylinder, 23...
- Central part outer circumference position detection sensor, 24...Grinding part outer circumference position detection sensor.

Claims (1)

[Scope of Claims] 1. In an in-line grinding device for a work roll, which is provided with a grinding means for online grinding a work roll in a rolling mill stand for rolling a rolled material, the grinding means is attached to the work roll at a predetermined gap. a movable nozzle having a header and disposed opposite to each other, a moving device that moves the nozzle in the axial direction of the roll, a profile recognition device that recognizes the profile of the roll and controls cutting; An in-line grinding device for work rolls, comprising a high-pressure water generator connected to a nozzle via piping. 2. The moving device includes a support device that supports the header and supports the nozzle at a predetermined position facing the work roll, a screw connected to the header, and a motor connected to the screw via a gear. and a sershin transmitter connected to the motor to recognize and control the movement amount and position of the nozzle, and the nozzle is moved cyclically and by changing the movement distance. The in-line grinding device for work rolls according to item 1. 3. The high-pressure water generator includes a hydraulic unit, a pressure intensifier connected to the hydraulic unit, a water supply unit that supplies water to the pressure intensifier, and a pulsating high pressure connected to the pressure intensifier and increased in pressure by the pressure intensifier. 2. The in-line grinding device for work rolls according to claim 1, which is formed of an accumulator for leveling water. 4. The profile recognition device is connected to a sensor mounting bracket having a reference portion that does not grind rolls provided at both ends of the work roll, a reference roller disposed in this reference portion via a reference roller, a cylinder that is connected to the frame and drives the frame toward the work roll; a center outer circumference position detection sensor that is attached to the sensor mounting bracket and detects the outer circumference position of the work roll body; and a roll. The in-line grinding device for work rolls according to claim 1, further comprising a grinding portion outer circumferential position detection sensor for detecting a grinding portion outer circumferential position of the grinding portion.