KR100323210B1 - On-line Rolling Mill - Google Patents

Abstract

The grinding unit 5 is constituted by the grinding wheel 20, the driving device 22 for driving the grinding wheel, and the conveying device 23, and when the grinding wheel is subjected to vibration of the work roll 1a, the abrasive layer of the grinding wheel The vibration energy is absorbed by the bending of the flat disk 52 having the elastic body function integrated with the 51. The rail frame 7 is moved by the rail moving device 30, and inclines the whetstone rotating shaft 21 with respect to the axis of the work roll 1a. The rail frame 7 is inclined in the opposite direction with respect to the axis of the rolling roll when the grinding unit 5 is in the position for grinding one end side of the rolling roll 1a and in the position for grinding the other end side. As a result, in the on-line rolling roll grinding device, it is possible to perform accurate and good rolling surface roughness grinding without absorbing vibration from the rolling roll and causing a shrinking phenomenon, and at the same time, one grinding unit for one rolling roll. It can grind to both ends of a roll.

Description

On-line rolling roll grinding machine

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on-line rolling roll grinding device installed in a rolling mill, in particular a sheet rolling mill, and more particularly to an on-line rolling roll grinding device that performs grinding of rolling rolls effectively without being affected by vibrations of the rolling rolls.

In general, when the rolling roll of the rolling mill rolls the slab material, only the rolled portion is rubbed, resulting in a difference (periphery difference) with the non-rolled portion. For this reason, there were limitations in rolling, such as rolling in sequence from wide slabs to narrow slabs. In order to solve this problem, a number of online rolling roll grinding systems and their control methods have been proposed.

For example, according to the Mitsubishi Act 1988 Vol.25, No.4, "Development of an online roll grinding device or Japanese Patent Application Laid-Open No. 62-174705, a plurality of cup grinding stones are applied to one rolling roll. The plurality of cup grinding wheels are arranged in one frame, and the whole frame always moves in a certain range, and the cup grinding wheel does not actively rotate by a motor and is driven by using the rolling force of the rolling roll. Drive (interlocking rotation) to grind the rolling roll whole surface (hereinafter, referred to as first conventional technology).

Further, in the specification of Japanese Patent Application Laid-Open No. 58-28705, one rolling roll calculation unit is arranged on one rolling roll, and a contact control acting as a position sensor is in contact with the neck portions of both ends of the rolling roll on the opposite side of the roll grinding unit. And a technique for detecting a deviation of the axis of the rolling roll with this position sensor and controlling the feeder so that the grinding wheel can follow the deviation (hereinafter referred to as the second conventional technology).

In addition, in 1992, Lecture on Lectures on the Spring Conference of the Korean Society of Precision Engineering, `` Online Constant Pressure Grinding of Rolled Rolls '', the abrasive layer of cup-type grindstone is made of cubic boron nitride (CBN) abrasive grain, The results of experiments of grinding the rolling rolls by arranging them substantially perpendicular to each other have been reported (hereinafter referred to as a third prior art).

Further, in the specifications of Japanese Patent Application Laid-Open No. 58-28706 and Japanese Patent Application Laid-Open No. 62-95867, a cup-shaped grindstone disposed so as to be substantially orthogonal to the rolling roll is provided so as to be slidable in the axial direction with respect to the grinding wheel rotation shaft. Moreover, the technique of supporting the back surface of the grindstone axially by an elastic body directly or through a boss and absorbing the rolling roll vibration is described (hereinafter referred to as the fourth conventional technology).

In addition, Japanese Laid-Open Patent Publication No. 61-242711 has a grinding method similar to that of the first conventional art, and is used to grind one roll for one roll using only one grindstone and to roll the entire length of the roll in the vicinity of the center of the roll shaft. Inverting the grinding surface of the whetstone is described in the following (hereinafter referred to as the fifth prior art).

On the other hand, in the on-line roll grinding apparatus provided in the cross rolling machine which rolls in the horizontal plane which the angle which makes the axis of a pair of upper and lower work rolls incline in the horizontal plane orthogonal to a rolling direction, it follows a work roll and moves a grinding body in a horizontal plane. For example, there exists a thing of Unexamined-Japanese-Patent No. 61-88907. It has fixed cushions and free cushions in contact with the working roll chock on the left and right ends of the frame containing the grinding bodies, and the two cushions allow the frame to follow the working roll chocks and In response to the rotational moment resulting from the difference in the pressure reaction force of the grinding body in contact with the work roll in the above, the fluid pressure is supplied to the two cushions, and the rotational moments are balanced (hereinafter referred to as the sixth prior art).

The rolling roll of a rolling mill is hold | maintained by the bearing assembled to roll chocks, and is rotating at high speed. This roll choke is provided with a gap in the inner and outer diameters to facilitate the exchange of rolls and bearings. The rolling roll rotates while moving back and forth between the gaps during rotation. In addition to this, the rolling roll cylindrical portion has a shift in the center of the bearing portion, and there is a movement in the vertical direction of the rolling roll by a screwdown device during sheet rolling. These are superimposed and a rolling roll is rotating, always vibrating.

In general, in the case of machining a cylindrical workpiece, the workpiece to be ground is supported by a center that rotates with high freezing density and is ground in a state where the vibration of the workpiece is minimized. However, when the rolling rolls are ground during rolling in a rolling mill, it is impossible to grind in a state where vibration is considerably small as in a normal work piece. The rolling roll during rolling is rotating, vibrating normally with the vibration width of 20 micrometers-60 micrometers, and the acceleration of about 1G-2G. In this state, the on-line roll grinding machine must be ground correctly.

In the first to third and fifth prior arts, when the rolling roll vibrating as described above is ground, unevenness is caused by the phenomenon of shrinking on the rolling roll surface. Moreover, the grinding wheel is also consumed remarkably by the impact force caused by the shrinking phenomenon, and the grinding wheel life is shortened, and the grinding wheel needs to be replaced frequently. Moreover, contact force control in the case of grinding a rolling roll in a predetermined form is difficult.

In addition, in the first prior art, the grindstone is rotated in conjunction with the rotational force of the work roll, so that the grinding capacity per grindstone is not high. Therefore, about 6 grinding bodies are required per work roll. In a rolling mill having a short roll length, there is no space for allowing the frame containing the plurality of grinding bodies to move in the roll axial direction. In the fifth conventional technique, since one grindstone is rotated in conjunction, the grinding ability is further lowered.

In the fourth prior art, the elastic body absorbs the vibration of the rolling roll. However, in this prior art, since the whole whetstone including the whetstone alloy is supported by an elastic body and moved back and forth, the weight of the moving part mass of the whetstone, that is, the weight of the moving part following vibration is a problem. Even if a cubic boron nitride (CBN) abrasive grain having a high grinding ratio is used as an abrasive layer of a grindstone, the movable part mass supported and supported by an elastic body has a grindstone diameter of 250 mm and includes a grindstone, a slide bearing, and a seal part. If the spring constant of the elastic body is 4 kgf, the allowable change of the contact force between the rolling roll and the grindstone should be 4 kgf, and the vibration amplitude of the rolling roll should be 130 kgf / mm. Under these conditions, the natural frequency of the movable part including the elastic body is 80 c / s. At this low natural frequency, the moving part including the elastic body resonates due to the vibration of the rolling roll, causing a shrinking mark on the roll surface, and also aggravates the grinding wheel. When grinding wheel diameter is made small and moving part mass is made small, grinding ability will fall largely.

Moreover, the cup grindstone becomes slidable in the axial direction of the grindstone rotating shaft, and supports the back surface of the grindstone with an elastic body. However, during roll grinding, coolant or grinding residues are scattered around the grindstone, and these penetrate into the grindstone between the grindstone and the grindstone shaft by preventing the smooth movement of the grindstone. It's hard to fulfill its function.

In addition, in the fifth conventional technique, since the entire length of the roll is ground using one grindstone, the grinding surface of the grindstone is inverted near the center of the roll shaft (the slope of the grindstone shaft is changed). No specific structure is disclosed.

On the other hand, in the sixth prior art related to the roll grinding apparatus of the cross rolling machine, the vibrations from the rolling roll are absorbed by the cushions provided at both ends of the frame. There are problems such as addition resonance, unevenness due to the phenomenon of shrinking on the surface of the rolling roll, shortening the grindstone life, and the like.

In addition, since the grinding device does not rotate, the grinding device requires a large pressing force for grinding, and unbalance occurs in reaction forces at both ends of the frame in which the grinding body is accommodated. In order to balance it and follow the cross angle of the roll, two cushions are required and the fluid pressure to be injected into these cushions must be properly controlled. Therefore, there is a problem that the structure is complicated.

It is a first object of the present invention to accurately and accurately perform rolling roll surface roughness grinding without absorbing vibration from the rolling rolls, and to roll one grinding unit for one rolling roll. An online rolling roll grinding device capable of grinding to both ends is provided.

A second object of the present invention is to accurately and accurately roll the surface of the rolling roll without absorbing the vibration from the rolling roll and causing the collapse of the rolling roll. The present invention provides an on-line rolling roll grinding apparatus that can move a grinding unit following.

According to the present invention, in order to achieve the first object, an on-line rolling roll grinding device installed on a rolling mill having one or more pairs of rolling rolls rotatably supported between opposing stands. Two grinding units and a rail frame for supporting the grinding unit in a axial direction of the rolling roll, wherein the grinding unit is a planar type grinding wheel for grinding the rolling roll, the grinding wheel being a grinding wheel In the on-line rolling roll grinding device having a driving means for rotating by means of rotation, the conveying means for pressing the rotary grindstone to the rolling roll, the traverse means for moving the grinding unit along the rail frame, the grinding wheel is A planar wheel disk installed on the whetstone rotating shaft and an abrasive layer fixed to one side of the flat disk; The flat disc has an elastic body function for absorbing vibration from the rolling roll; When the grinding unit is moved along the rail frame characterized in that it further has a rail diameter moving means for changing the inclination of the stand of the rail frame while maintaining the moving direction of the grinding wheel parallel to the axis of the rolling roll An online rolling roll grinding device is provided.

In the grinding apparatus, preferably, the rail inclined movement means is installed on the opposite stand, guide means for supporting the rail frame so as to be inclined relative to the stand, and the grinding unit has one end of the rolling roll. Rail position control means for inclining the rail frame in an opposite direction with respect to the axis of the rolling roll when in the position of grinding the side and in the position of grinding the other end, and the grinding unit moves along the rail frame And grinding wheel position control means for keeping the moving direction of the grinding wheel in parallel with the axis of the rolling roll.

Preferably, the rail position control means has an actuator provided with respect to the stand, rail moving means for moving the rail frame with respect to the stand in the approaching and disengaging direction of the rolling roll, and the grinding unit is rolled. And a means for controlling the drive of the actuator so that the moving direction of the rail frame is reversed when the end of the roll is in the grinding position and when the other end is in the grinding position.

Further, preferably, the grinding wheel position control means transfers the grinding wheel so that the grinding wheel moves in parallel with the axis of the rolling roll regardless of the distance change between the rail frame and the axis of the rolling roll due to the inclination of the rail frame. Means for driving the device and the traverse device.

Moreover, in order to achieve the said 2nd objective, according to this invention, the on-line rolling roll grinding apparatus provided in the cross rolling machine which crosses one or more pair of rolling rolls rotatably supported between opposing stands in a horizontal direction, and performs rolling. A rolling unit comprising: at least two grinding units provided with respect to at least one rolling roll, and a rail frame supporting the grinding unit so as to be movable in the axial direction of the rolling roll, wherein the grinding unit is a flat plate for grinding the rolling roll. On-line rolling roll grinding having a rotary grindstone, a driving means for rotating the rotary grindstone on the grindstone rotation side, a conveying means for pressing the rotary grindstone to the rolling roll, and a traverse means for moving the grinding unit along the rail frame. In the apparatus, the rotary grindstone is a flat disk provided on the grindstone rotating side and one side of the flat disk. It has an abrasive layer fixed to the surface, the flat disk has an elastic body function for absorbing the vibration from the rolling roll; When the grinding unit is moved along the rail frame the direction of movement of the grinding wheel of the rolling roll An on-line rolling roll grinding device is provided, further comprising rail inclined movement means for changing the inclination of the rail frame with respect to the stand while keeping parallel to the axis.

In the grinding apparatus, the rail tilt moving means is a following moving means for moving the rail frame following the cross angle of the rolling roll so that the rail frame is kept parallel to the axis of the rolling roll.

In the grinding apparatus, preferably, the rail inclined movement means is provided in the opposite stand, and guide means for supporting the rail frame in an inclined manner relative to the stand, and the rail frame is formed of the rolling roll. And rail position control means for inclining the frame frame relative to the stand to follow the cross angle of the rolling roll so as to remain parallel to the axis.

Preferably, the rail position control means has an actuator provided with respect to the stand, the rail moving means for moving the rail frame in the approaching and disengaging direction of the rolling roll with respect to the stand, and at the cross angle of the rolling roll. And means for controlling the drive of the actuator such that the rail frame is parallel to the axis of the rolling roll based on the information.

The rail inclined movement means has a cross block which is installed on each of the opposing stands to contact a bearing box supporting both ends of the rolling roll and presses it, and both ends of the rail frame are connected to the cross block. The rail moving means may be provided in contact with each other to enable the rail frame to move integrally with the cross block.

Further, the grinding wheel is preferably arranged such that the contact line between the abrasive layer and the rolling roll is formed only on one side as viewed from the center of the grindstone.

Further, in the grinding apparatus according to the first and second objects, the rail moving means positions the rail frame when the rail frame is started by the actuator in the approaching and disengaging direction of the rolling roll. It is preferable to further provide a stopper means. In more detail, the rail moving means maintains the screw rotating by the actuator, the stopper moving in the approaching and disengaging direction of the rolling roll and the rail frame in contact with the stopper by the rotation of the screw. It further comprises a biasing means.

The abrasive layer preferably comprises cubic boron nitride abrasive grains or diamond abrasive grains.

The effect | action of this invention comprised as mentioned above is demonstrated.

First, one of the inventors of the present application confronts one side of a pair of rolling rolls in United States Patent Application No. 08 / 070,760 (filed June 3, 1993) with respect to the commonalities of the first and second objects of the present invention. And a plate-type rotary grindstone for grinding the rolling roll, a driving device for rotating the rotary grindstone by a grindstone rotating shaft, a feeder for pressing the rotary grindstone on the rolling roll, and the rotary grindstone in the axial direction of the rolling roll. In a rolling mill having an on-line roll grinding apparatus having a traverse device for moving to a roller, the grinding wheel has a flat disk provided on the grindstone rotating shaft, and an abrasive grain fixed on one side of the flat disk. It was proposed to have a structure having an elastic body function for absorbing vibrations from a rolling roll.

Further, in the arrangement of the grinding wheel, the grinding wheel rotating shaft is inclined at a small angle with respect to the direction perpendicular to the rolling roll axis so that the contact line between the abrasive grain layer and the rolling roll is formed only on one side in the roll axial direction as viewed from the center of the charcoal stone. Suggested to deploy.

In the above-described invention, the flat disc, which is part of the flat grindstone, has an elastic body function, and when the grindstone is pressed by the vibration of the rolling roll, the flat disc is bent to absorb the vibration from the rolling roll in an instant. As a result, the fluctuation of the contact force between the abrasive grain layer and the rolling roll is limited to a small range of the elastic force generated by the bending of the flat plate, thereby eliminating the collapse. Moreover, an elastic body function is divided | segmented into the flat disk which acts as a base which supports an abrasive grain layer, and an abrasive grain layer and an elastic body functional member are integrated. Therefore, the masses driven by the vibrations from the rolling rolls are only the abrasive layer and the flat disk, and the movable part mass is considerably smaller, and the natural frequency of the grinding wheel becomes high. For this reason, it can grind correctly for a long time without the phenomenon which the vibration rolling roll collapses by resonance.

In addition, by rotating the grinding wheel so that the contact line between the abrasive layer and the rolling roll is formed only at one side from the center of the grinding wheel, the grinding wheel is inclined in a cantilever shape due to the pressing force on the rolling roll. The elastic body function can be effectively exerted, so that vibration from the rolling roll can be easily absorbed. In addition, since the contact line is formed at one side of the grindstone center, further shrinkage is prevented.

The grinding device of the present invention works in the same way as the prior invention by using the above-described invention. In other words, it is possible to perform accurate and good rolling roll surface roughness without absorbing the vibration from the rolling roll and causing the shrinking phenomenon.

In accordance with the first object of the present invention, there are devices in the vicinity of the work roll of the rolling mill, which constitute the original rolling mill such as a sheet guide, and do not interfere with these devices when the grinding unit of the on-line rolling roll grinding device is placed here. For this reason, it is desired to be able to grind the entire length of one rolling roll with one grinding unit. In order to grind the total length of the rolled roll to one grindstone, it is necessary to improve the grinding capacity per grindstone so that the grinding capacity of one grindstone exceeds the amount of grinding required to cut the step generated in the roll.

It is confirmed that the grinding wheel of the above-described invention exhibits a higher grinding capacity by inclining the grinding wheel rotation shaft to make one contact line, thereby providing a higher grinding capacity, and by installing one grinding unit having the grinding wheel on one rolling roll. It can grind to the both ends of a rolling roll.

By the way, if the grindstone rotating shaft is inclined as described above, the grinding surface side (contact line side) of the grindstone can be ground up to the roll end, but if the semi-grinding surface side is ground up to the roll end portion, the diameter portion of the grindstone must move outward. In this case, since there are a bearing box and a stand at the roll end, a grindstone interferes with them, and a problem arises in that it cannot be ground to the roll end (see Fig. 7). By grinding the grinding surface by reversing the inclination of the grindstone rotating shaft on one end side and the other end side of the roll, one grindstone can be ground to the roll end portion. However, if the inclined transfer device that changes the inclination of the whetstone rotating shaft is installed, the device configuration of the grinding unit increases, and if the inclined transfer device is installed in the grinding unit, the inclined transfer device interferes with the bearing box before the grindstone moves to the roll end. Problem occurs.

In the present invention, the whetstone rotating shaft is inclined with respect to the roll axis by using a rail frame for supporting the grinding unit, and by inclining the rail frame with respect to the stand by the rail tilt moving means. In addition, the inclination of the whetstone rotating shaft is reversed by changing the inclination of the stand of the rail frame by the rail inclination moving means, and the grinding surface of the whetstone is changed.

More specifically, the rail frame is supported by the guide means so as to be inclined relative to the stand, and when the grinding unit is in the position to grind one end side of the rolling roll and the other end side is ground by the rail position control means. When inclined, the rail frame is inclined in the opposite direction with respect to the axis of the rolling roll to reverse the inclination of the grindstone rotating shaft on one end side and the other end side of the roll. This makes it possible to grind to the roll end without interfering with the whetstone, bearing box or stand.

In addition, when the rail frame is inclined in this manner, the rail frame and the rolling roll are not parallel to each other, and thus the distance between the grindstone and the roll axis line changes and the grinding amount changes. In the present invention, with respect to such a change in distance, the moving direction of the grinding wheel when the grinding unit moves along the rail frame is maintained parallel to the axis of the rolling roll by the grinding wheel position control means. Thereby, the contact force between a rolling roll and a grinding wheel is controlled so that the target grinding amount may come out.

As an example of the rail position control means, a rail moving means for moving the rail frame with respect to the stand in the approaching and disengaging direction by means of an actuator is provided, and the grinding unit is in a position for grinding one end side of the rolling roll. When the other end side is in the grinding position, the inclination of the rail frame is reversed by controlling the drive of the actuator so that the moving direction of the rail frame is reversed. In this case, the inclination angle of the rail frame can be set precisely by providing a stopper means for positioning the rail frame. In addition, a screw is installed on the rail moving means, and the rotation of the screw moves the stopper in the approaching and disengaging direction of the rolling roll, and the contact state between the stopper and the rail frame is maintained by the biasing means at a desired angle. The angle of inclination of the rail frame can be set precisely.

According to the second object of the present invention, in the case where two or more grinding units are installed and ground in a cross rolling machine where the upper and lower work rolls cross, the configuration is simple by changing the inclination of the stand of the rail frame by the rail tilt moving means as described above. The roll can be easily ground to both ends of the roll while the grinding wheel is moved following the cross angle.

That is, the rail frame is moved by following the cross angle of the rolling roll by the following moving means so that the rail frame is parallel to the axis of the rolling roll. More specifically, the rail frame is supported by the guide means so as to be inclined with respect to the stand, and the rail frame is tracked by following the cross angle of the rolling roll so that the rail frame is kept parallel to the axis of the rolling roll by the rail position control means. Tilt against the stand. As an example of the rail position control means, an rail moving means for moving the rail frame with respect to the stand in the approaching and disengaging direction by means of an actuator is provided, and the rail frame is based on the information on the cross angle of the rolling roll. By controlling the drive of the actuator to keep parallel to the axis, the grindstone can be moved following the cross angle. Also in this case, the parallelism of a rail frame and a rolling roll can be precisely maintained by providing the above stopper means or a screw to a rail moving means.

In the case where a cross block is provided in contact with a bearing box for supporting both ends of the rolling roll and pressed on each of the opposite stands of the rolling mill, the rail frame is brought into contact with the cross block by contacting both ends of the rail frame as rail inclining means. The rail moving means which moves integrally may be provided, and it can also move a grindstone following a cross angle.

EMBODIMENT OF THE INVENTION Hereinafter, the Example of this invention is described based on drawing.

First, the first embodiment of the present invention will be described with reference to FIGS. 1 and 2, the rolling mill according to the present embodiment supports a pair of rolling rolls (up and down work rolls) 1a and 1a and rolling rolls 1a and 1a which extend the rolling material s. It is a four-stage rolling machine which has a pair of rolling rolls (upper and lower reinforcement rolls) 1b (only one is shown). The rolling rolls 1a and 1a are held by the bearing boxes 3 and 3, and these bearing boxes 3 and 3 are assembled to the stand 4 on the operation side and the drive side. The inlet side guide 10 is arrange | positioned at the inlet side of a rolling mill, and guides the rolling material s to the rolling roll 1a. A coolant header 15 (only one side) is installed to cool the heat of the rolling rolls 1a and 1a generated during rolling, and the heat of the rolling rolls 1a and 1a generated during rolling is cooled. do.

The on-line rolling roll grinding device of this embodiment is provided with such a rolling mill. The on-line rolling roll grinding device has one grinding unit 5 provided for one work roll 1a.

As shown in FIGS. 3 and 4, the grinding unit includes a rotary grindstone 20 for grinding the work roll 1a, and a drive device 22 for rotating the grindstone 20 by the grindstone rotating shaft 21. ), A feeder 23 for pressurizing the grindstone 20 to the work roll 1a, and a traverse device 24 for moving the grindstone 20 in the axial direction of the work roll 1a.

The grindstone 20 has a flat disk 52 having a boss 52a and an annular abrasive grain layer 51 fixed to the opposite side of the boss side of the flat disk 52, as shown in an enlarged view in FIG. The flat disc 52 is provided on the grindstone rotating shaft 21 at the boss 52a. Moreover, the flat disk 52 has an elastic body function in order to absorb the vibration from a work roll, and it is a structure which the amount bent by the contact force between the work roll 1a and the abrasive grain layer 51 changes.

The flat disc 52 preferably has a spring constant of 1000 kgf / mm to 30 kgf / mm, more preferably 500 kgf / mm to 50 kgf / mm, for its elastic body function. The abrasive grain layer 51 is integrally formed with the flat plate disk 52 by an adhesive, so that the abrasive grain 51 can be stably adhered to the vibrating work roll 1a.

The abrasive grain layer 51 is made of cubic boron nitride abrasive grains (commonly referred to as CBN) or diamond abrasive grains, which are super abrasive grains, with a concentration of abrasive grains of 50 to 100 and grain sizes of 80 to 180, Redin bond is fixed using a binder. Moreover, since the material of the flat plate 52 is for the purpose of easily dissipating the grinding heat from the ultra abrasive grain of the abrasive grain layer 51, and the purpose of reducing the mass of a movable part, it is made of aluminum material or an aluminum alloy.

As shown in FIG. 5, the grinding wheel 20 is arranged such that the axis Gc1 of the grinding wheel rotation shaft 21 is inclined at a small angle α with respect to the line Sc perpendicular to the axis Rc of the work roll 1a. The contact line between the abrasive grain layer 51 and the work roll 1a is formed only on one side as seen from the center of the grindstone. The inclination angle α is preferably about 0.5 ° to 1.0 °. By the arrangement of the grinding wheel 20, the flat disk 52 can effectively exhibit the elastic body function.

As shown in FIG. 3, the drive device 22 includes a liquid motor 54 (may be an electric motor) and an output shaft of the liquid motor 54 for rotating the rotary grindstone 20 at a predetermined circumferental speed. (54a) has a pulley shaft 54b and a belt 55 for transmitting rotation to the whetstone rotating shaft 21, and the output shaft 54a and the pulley shaft 54b pass through parallel splines 54c. It is connected. The pulley shaft 54b is rotatably supported by the body 59. The grindstone rotating shaft 21 is rotatably supported in the body 59 so as to be freely and axially movable via the slide-type radial bearings 21a and 21b. On the opposite side of the grindstone of the grindstone rotating shaft 21, a load cell 53 for measuring the contact force between the grindstone 20 and the work roll 1a is housed in the body 59.

The body 59 is housed in the case 25, and the hydraulic motor 54 is provided in the case 25. As shown in FIG. 4, the body 59 is mounted on the bottom of the case 25 so as to be movable in the axial direction of the grindstone rotating shaft 21 via the slide bearing 25a.

The conveying apparatus 23 includes a conveying motor 57 installed in the case 25 as shown in FIG. By moving the body 59 in the approach and departure direction of the work roll (1a) by the rotation of the feed motor 57, the backlash for moving the grinding wheel 20, the grinding wheel shaft 21 and the load cell 53 at the same time A pre-loaded ball screw 56 of the type missing; It has the encoder 57a which detects the rotation angle of the feed motor 57. As shown in FIG. Instead of the preload ball screw 56, a gear mechanism of the backlash-free type may be used. The preload ball screw 56 is composed of a screw shaft 56a connected to the transfer motor 57 and a nut portion 56b integrally formed with the body 59, and the ball is provided in the screw groove of the nut portion 56b. When the ball is engaged with the screw groove of the screw shaft 56a, and the screw shaft 56a is rotated by the feed motor 57, the nut part 56b moves back and forth by engaging with the ball, and the body 59 ) Will move back and forth.

As shown in FIG. 4, the traverse device 24 includes a pinion 58a mounted on a rotating shaft of the traverse motor 58 and the traverse motor 58 installed in the case 25 and engaged with the rack 14; It is provided on the upper surface of the case 25, and has two pairs of guide rollers 26 which engage with a pair of guide rails 7a and 7b, and the encoder 58b which detects the rotation speed of the traverse motor 58. As shown in FIG. . The guide rails 7a and 7b are provided on the rail frame 7 extending in parallel along the axis of the work roll 1a on the inlet side of the work roll 1a as shown in FIG. 1 and FIG. . The rack 14 is formed on the side opposite to the work roll side of the guide rail 7b. As such, the grinding unit 5 is supported by the rail frame 7 via the guide roller 26 and the guide rails 7a and 7b, but the rotation of the traverse motor 58 and the pinion 58a and the rack 14 By engagement, it is possible to move smoothly in the roll axis direction.

It is necessary for the roll grinding unit 5 not to interfere with the bearing box 3 at the time of replacing the work roll 1a. Therefore, both ends of the rail frame 7 are slidably supported by the guide 9 provided on the stand 4, and the grinding unit 5 is provided on the operation side and driving side rails respectively installed near both ends of the rail frame 7. The moving device 30 is able to move in the direction of approach and departure of the rolling roll 1a together with the rail frame 7.

Each rail moving device 30 is constituted by a worm screw 31, a motor 32 for driving the same, and an encoder 33 for the motor. The tip of the screw shaft 31a of the worm screw 31 is a rail frame. It is pinned to (7).

The feed motor 57 of the feed device 22, the traverse motor 58 of the traverse device 24 and the motor 32 of the rail moving device 30 are control devices 13a and 13b, respectively, as shown in FIG. 13d). In addition, detection signals of the load cell 53, the encoder 57a of the transfer device 23, the encoder 58b of the traverse device 24, and the motor encoder 33 of the rail moving device 30 are determined by the information processing device ( 13c) for processing.

In the above, the rail moving device 30 has an actuator (motor) 32 installed in the stand 4 to move the rail frame 7 in the approaching and disengaging direction of the rolling roll 1a with respect to the stand 4. And the information processing apparatus 13c, the control apparatus 13d, and the encoder 33, when the grinding unit 5 is in a position to grind one end side of the rolling roll 1a, and the other. The means for controlling the drive of the actuator 32 is configured so that the movement direction of the rail frame 7 is reversed when the end side is in the grinding position.

Moreover, the guide 9 is provided in the opposite stand 4, and comprises the guide means which supports the rail frame 7 so that it can inclinedly moved with respect to the stand 4, and the rail moving apparatus 30 and the information processing apparatus (13c), the control device (13d) and the encoder (33) roll the rail frame (7) when the grinding unit (5) is in the position to grind one side of the rolling roll and in the position to grind the other end. Rail position control means for inclining in the opposite direction with respect to the axis of the roll is constituted, and the information processing apparatus 13c, the control apparatus 13a, 13b, and the encoders 57a, 58b are the grinding units 5 with the rail frame 7 The grindstone position control means which keeps the moving direction of the grindstone 20 at the time of moving along () parallel to the axis line of the rolling roll 1a is comprised.

By the above, the rail moving device 30, the information processing device 13c, the control devices 13a, 13b, 13d, the encoders 33, 57a, 58b, and the guide 9 have a grinding unit 5 having a rail frame ( 7 is a rail inclined movement means for changing the inclination of the rail frame 7 with respect to the stand 4 while maintaining the moving direction of the grinding wheel 20 when moving along the 7) parallel to the axis of the rolling roll 1a. Function. The inclination with respect to the axis Rc of the work roll 1a of the grindstone rotating shaft 21 about the arrangement | positioning of the said grindstone 20 here is given by the inclination of this rail frame 7.

Next, the operation and control of the on-line rolling roll grinding apparatus of this embodiment will be described.

First, the operation of the grinding wheel 20 in the on-line rolling roll grinding device of the present embodiment will be described.

The work roll 1a rotates while vibrating at a frequency of 10 to 150 C / S according to the rolling speed. In the case where a roll grinder having a generally cylindrical grindstone is installed as an on-line grinding device as a conventional off-line grinding device, the cylindrical grindstone and the work roll are contacted via abrasive grains on the grindstone surface, and the metal surface and the abrasive grain on the roll surface collide to perform grinding.

When the abrasive is in contact with the surface of the work roll, the work roll is ground, the next instant grindstone is separated from the work roll, and the abrasive grain is rotated. Such discontinuous grinding causes shrinkage and becomes uneven working roll surface and cross section.

If the grinding wheel is subjected to vibrations such as pain of the working roll, the change of the contact force between the grinding wheel and the working roll does not occur. However, vibrating the grindstone and the grindstone frame as a whole with the work roll is difficult to follow because the work roll vibration is high frequency at 150 c / s.

If you do not try to avoid the vibration of the work roll in the whetstone and the whole whetstone frame, but have the elastic body function on the whetstone itself and absorb the vibration by the wander of the whetstone, the mass of the moving part decreases, so you can quickly follow the vibration of the work roll. The fluctuation of the contact force between the roller and the work roll becomes small.

In this embodiment, the flat disc 52, which is a part of the grindstone 20, has an elastic body function, and the grindstone body has an elastic body function, and the rotary grindstone 20 has an outer circumferential speed of 1000 m /. While rotating so as to be min to 1600 m / min, it is pressed by the rotating work roll 1a to bend. The work roll 1a vibrates back and forth as mentioned above. The grinding wheel 20 is pressurized by this vibration, but at this time, the flat disk 52 is bent as shown in FIG. 5, and the vibration from the work roll 1a is absorbed in an instant. As a result, the change in the contact force between the abrasive layer 51 and the work roll 1a becomes a small range due to the elastic force generated by the bending of the flat disk 52, thereby eliminating the collapse.

In addition, in the case where the whetstone itself has an elastic body function, it is difficult to give the whetstone body an elastic body function in the cylindrical whetstone because the work roll and the whetstone rotating shaft are arranged in parallel. However, in the case of flat grindstone, since the work roll and the grindstone rotating shaft are almost perpendicular to each other, it is easy to give the grindstone body an elastic body function. Therefore, in order to grind | pulverize the vibrating work roll, it is effective to use a disk whetstone.

That is, in this embodiment, the flat disc 52, which is the base of the abrasive grain layer 51, has an elastic body function. In addition, in order to effectively exhibit the elastic body function, as shown in FIG. 5, the rotary grindstone 20 is arrange | positioned so that the contact line of the abrasive layer 51 and the work roll 1a may be formed only at one side in the center of a grindstone. In this way, the flat disk 52 can be bent in a cantilever form by the pressing force to the work roll 1a, and the vibration from the work roll 1a can be absorbed.

In addition, since the abrasive grain layer 51 has an annular shape, even when the grinding wheel 20 is pressed in parallel with the work roll 1a, it is supported by two abrasive grain layers on both sides of the center of the grindstone, and the flat disk 52 ) Can be bent. However, in this case, since both ends are supported, the amount of warpage decreases. When supported at one place as in the present embodiment, larger warpage can be obtained using the same flat disc 52.

The grindstone has a permissible range of change in the contact force between the work roll and the grindstone due to the grinding ability of the abrasive. In the case where the whetstone itself has an elastic body function, the following conditions are required in order to maintain the contact force within the allowable variation range even if the work roll vibrates, and not to resonate the whetstone.

F ≥ K × A _max

F: Permissible range of change in focusing force

A _max : Work roll single amplitude

K: spring constant of the elastic body

In other words,

K ≤ F / A _max

If the spring constant of the elastic body of the whetstone itself is smaller than this spring constant (K), which is determined by the allowable variation range (F) of the grinding wheel contact force and the work roll single amplitude (A _max ), the grindstone always follows the work roll. Grinding can be carried out.

On the other hand, when the natural frequency of the grindstone coincides with the frequency of the work roll, the grindstone resonates and thus cannot be ground accurately. Therefore, it is better to set the natural frequency of the grindstone as far as possible from the frequency of the work roll.

F _n > F _rmax

F _n : natural frequency of whetstone

F _rmax : Maximum frequency of work roll

By the way, the natural frequency of a whetstone is represented by the following formula | equation.

M: mass of the whetstone containing an elastic body (movable part mass)

Therefore, when the natural frequency of the grindstone is increased, the spring constant K of the elastic body must be increased or the grindstone mass M including the elastic body must be reduced. The spring constant of the elastic body cannot be larger than any value (F / A _max ) as described above. To increase the natural frequency of the whetstone, the mass of the whetstone containing the elastic body must be reduced.

For example, when F = 4kgf and A _max = 30㎛, K = 133kgf / mm. Therefore, _assuming F _rmax = _{150 c} / s and F _n = _{400 c} / s, the movable part mass M including the grindstone must be suppressed to 0.2 kg.

In the case of whetstone using aluminum oxide (Al ₂ O ₃ ) or silicon carbide (SiC) abrasive grains, which are generally used as whetstone, if the whetstone mass is reduced to 0.2 kg, the whetstone is consumed immediately and the whetstone several times a day. It is necessary to change the pressure, and the effect of the work roll grinding in the rolling mill is greatly impaired.

To solve this problem, it is necessary to use a grindstone having a high grinding ratio (reduced volume / reduced volume of the workpiece).

At present, in grinding wheels using general aluminum oxide (Al ₂ O ₃ ) or silicon carbide (SiC) abrasive grains, it is difficult to raise the grinding ratio to three or more when a hard work roll is ground. However, the grinding wheel 20 of this embodiment made of boron crystalline crystalline abrasive grains (commonly referred to as CBN) or diamond abrasive grains has a grinding ratio exceeding 300 even when grinding the work roll 1a. It has a grinding ratio of 100 times or more that of a grindstone using (Al ₂ O ₃ ) or silicon carbide (SiC) abrasive grains. By utilizing this high grinding ratio of ultra abrasive grain and using this abrasive grain as a grinding wheel of an on-line roll grinding apparatus, it is possible to grind for a long time with a small weight.

In addition, in this embodiment, the abrasive grain layer 51 is attached to the base of a flat disc shape, the elastic body function is divided to this flat disc 52, and the abrasive layer 51 and the elastic functional member are integrated. Therefore, only the abrasive grain layer 51 and the flat disk 52 are movable by the vibration from the work roll 1a, and the movable part mass can be made quite small, and the natural frequency of the grinding wheel 20 can be made high.

Thus, in this embodiment, in order to reduce the mass of the movable part, a high abrasive grain (light weight and long grinding life) is used for the abrasive grain layer 51, and integrated with the flat disk 52 having an appropriate spring constant. Since the rotating grindstone 20 is pressed against the work roll 1a while being rotated, the vibrating work roll can be accurately ground for a long time without causing a phenomenon of shrinking due to resonance.

In addition, in this embodiment, one grinding unit 5 is provided for one rolling roll 1a, and in order to grind the entire length of the rolling roll 1a with one grinding unit (one grindstone), 1 It is necessary to improve the grinding capacity per grindstone so that the grinding capacity of two grindstones exceeds the amount of grinding required to remove the step created on the roll. The grinding wheel 20 is inclined to grind the grindstone rotating shaft 21 to be ground at one point, thereby exhibiting high grinding ability, and can be ground to both ends of the rolling roll by one grinding unit 5.

Next, the control of the on-line rolling roll grinding apparatus of this embodiment will be described.

In the present embodiment, the grindstone rotating shaft 21 is inclined as described above and the grinding is performed with one contact line. In this way, when the grindstone rotating shaft 21 is inclined, the grinding surface side (contact line side) of the grindstone can be ground up to the roll end portion, but if the grinding surface opposite side is to be ground up to the roll end portion, the diameter portion of the grindstone must move outward. In this case, as shown in Fig. 7, since there are a bearing box and a stand 4 at the roll end, a problem arises that the grindstone interferes with these and cannot be ground to the roll end.

By grinding the grinding surface by reversing the inclination of the grindstone rotating shaft 21 on one end side and the other end side of the roll, one grindstone can be ground to the roll end portion. However, if an inclination transfer device for changing the inclination of the whetstone rotating shaft 21 is provided, the device configuration of the grinding unit is increased, and if the inclination transfer device is installed in the grinding unit, the inclination transfer device is bearing before the grindstone moves to the roll end. Interference with the box occurs.

In this embodiment, the rail frame 7 is inclined with respect to the stand 4 by the rail inclination moving means which uses the rail frame 7 which supports the grinding unit 5, and includes the rail moving apparatus 30. FIG. Thus, the grindstone rotating shaft 21 is inclined with respect to the axis of the rolling roll 1a. Moreover, by changing the inclination of the rail frame 7 with respect to the stand 4, the inclination of the grindstone rotating shaft 21 is reversed, and the grinding surface of a grindstone is changed. Therefore, the rail moving apparatus 30, the grindstone conveying apparatus 23, and the traverse apparatus 24 are controlled as follows. First, in a state where the rail frame 7 is parallel to the work roll 1a, the positional relationship of the grindstone rotating shaft 21 of the grinding unit 5 is perpendicular to the axis Rc of the work roll 1a in advance. Set to. First, when grinding the left half of FIG. 8 of the work roll 1a, the rail frame 7 is θ degrees with respect to the work roll axis Rc using the rail moving device 30 in order to make the grinding surface to the left side. It is fixed to the position of inclination and S1 (step 100). θ degree is a minute angle of about 0.5 degree. Next, the grinding unit 5 is moved by engaging the traverse motor 58 and the rack 14, and information processing indicates that the axis of the whetstone rotating shaft 21 is moved to the Ga position by the information of the encoder 58b. When the apparatus 13c recognizes, it stops (step 101), presses the grinding wheel 20 to the rolling roll 1a, and starts rolling (step 102),

After the start of grinding, the grinding unit 5 is moved by engaging the traverse motor 58 and the rack 14 (step 103), and the grinding surface of the grinding wheel 20 is moved by the information of the encoder 58b. When the information processing apparatus 13c recognizes that the movement to the center part Rm of (1a) is recognized, the grinding wheel is retracted from the position of C1 to the position of C2 (step 104).

Next, the rail frame 7 is inclined using the rail moving device 30 until it becomes a position S2 in which -θ is inclined with respect to the work roll axis Rc in the reverse order (step 105). As the inclination of the rail frame 7 changes, the grinding surface of the grinding wheel becomes the opposite side so far, and the grinding wheel rotation axis whose new grinding surface becomes the central portion Rm of the work roll 1a is returned to the position of Gb ( Depth 106). The rotary grindstone 20 is moved from the position of b2 to the roll diameter direction by the grindstone feeder 23, and is pressed to the position where the rotary grindstone 51 and the work roll 1a generate the necessary contact force (step 107). In this state, the traverse apparatus 24 moves to the position of the grindstone rotation axis Gd (depth 108). The return is operated in the opposite direction to the present time, and the grinding wheel 51 is returned to the position of the grinding wheel axis Ga while grinding (steps 109 to 114).

Since the grinding unit 5 moves on the reframe 7 in the grinding operation (depth 103, 108, 109, 114), the distance between the work roll and the grindstone 20 always changes due to the inclination of the rail frame 7. The grindstone rotating shaft 21 is moved back and forth by the grindstone feeder 23 so as to generate the necessary contact force between the grindstone 51 and the work roll 1a. Alternatively, the rail frame 7 may be moved back and forth by a small amount. Thereby, grinding can be performed similarly to the case where the rail frame 7 is parallel with the work roll 1a.

FIG. 10 shows another control method, in which one end of the rail frame 7 is freely installed, and the other end is moved and moved back and forth by the rail moving device 30, and the grinding wheel 20 is ground. When the range is on the right side and on the left side, grinding is performed by moving the inclination angle of the rail frame 7 to be θ, -θ with respect to the work roll axis Rc. Since the inclination angle of the rail frame 7 is a small angle of about 0.5 degrees, the distance difference generated between the rail frame 7 and the work roll 1a is corrected by the movement of the whetstone feeder 23, and the grinding wheel 20 Can be moved with a predetermined contact force to the work roll (1a).

The above has described the grinding of the work roll 1a, but of course, the reinforcing roll 1b can be ground by the same method.

In this embodiment, the worm screw 31 is used to move the rail frame 7, but instead of the worm screw 31, two hydraulic cylinders of a large stroke and a small stroke are connected. In the control of the present invention in which the inclination of the rail frame 7 is used, the above-described control is possible even by using a small stroke cylinder.

A second embodiment of the present invention will be described with reference to FIGS. 11 to 16. In this embodiment, in the cross rolling machine in which the work rolls move horizontally in opposite directions with respect to an axis line perpendicular to the rolling direction, the rolling rolls follow the cross angle to perform grinding. In the figure, the same code | symbol is attached | subjected to the member equivalent to the member which concerns on 1st Example.

11 to 13, the rolling mill according to the present embodiment supports a pair of rolling rolls (up and down work rolls) 1a and 1a and rolling rolls 1a and 1a which extend the rolling material S. Cross device for cross-crossing a pair of rolling rolls (up and down reinforcement rolls) 1b and 1b, roll benders 130 and 130 and bending rolls 1a and 1a that give warpage to the rolling rolls 1a and 1a ( It is a four-stage rolling mill having 40, 40).

The online rolling roll grinding device of this embodiment includes two upper grinding units 5a and 5b for the upper work roll 1a (hereinafter referred to as "5" in common description) and two for the lower work roll 1a. It has two lower grinding units 6a and 6b (similarly represented by "6").

The upper grinding units 5a and 5b are provided respectively corresponding to the operation side end portion and the driving side end portion of the upper work roll 1a, and can be ground independently of each other. The lower grinding units 6a and 6b are also provided corresponding to the operation side end and the driving side end of the lower work roll 1a, and can be ground independently of each other. These grinding units 5a, 5b and 6a, 6b have the same structure as the grinding unit 5 described in the first embodiment, and as shown in FIGS. 3 to 5, respectively, the work roll 1a is ground. Flat tubular grindstone 20, drive device 22 for rotating the grindstone 20 by the grindstone rotating shaft 21, and feeder 23 for pressurizing the grindstone 20 on the work roll 1a. And a traverse device 24 for moving the grinding wheel 20 in the axial direction of the work roll 1a.

Moreover, as shown in FIG. 14, as for the rotary grindstone 20 of the grinding unit 5a and the rotary grindstone 20 of the grinding unit 5b, the axis line Gc1 of each grindstone rotating shaft 21 is a work roll 1a. The small angle α is inclined in a direction opposite to each other with respect to the line Sc perpendicular to the axis Rc of the vertical axis Rc, and the contact line between the abrasive layer 51 and the work roll 1a is viewed from the center of the grindstone. It is formed only in each roll end part side of a roll axial direction. The same applies to the rotary grindstone 20 of the grinding unit 6a and the rotary grindstone 20 of the grinding unit 6b. This makes it possible to grind to both ends of the work roll 1a without causing interference with the stand.

It is necessary for the roll grinding units 5 and 6 not to interfere with the shaft bearing 3 when the work rolls 1a and 1a are replaced. Therefore, both ends of the rail frames 7 and 8 with the rails 7a, 7b and 8a and 8b are slidably supported by the guide 9 provided on the stand 4, and the grinding units 5 and 6 are The rail moving devices 30 installed on both ends of the rail frames 7 and 8 may move in the direction of approach and departure of the rolling rolls 1a and 1a together with the rail frames 7 and 8, respectively. It is supposed to be. Each rail moving device 30 is constituted by a worm screw 31, a motor 32 driving the same, and an encoder 33 for the motor. The tip of the screw shaft 31a of the worm screw 31 is formed by a rail frame ( 7,8) pins.

As shown in FIG. 13, the cross device 40 includes a cross block 41 for contacting the bearing box 3 and pressing the bearing box 3, a piston 42 for moving the cross block 41 back and forth, and a piston ( The displacement meter 43 which measures the movement amount of 42, the hydraulic chamber 44a which pushes a piston, and the hydraulic chamber 44b which returns the piston 42 are comprised.

The feed motor 57 of the feed device 23, the traverse motor 58 of the traverse device 24 and the motor 32 of the rail transfer device 30 are control devices 13a and 13b, respectively, as shown in FIG. 13d). The load cell 53, the encoder 57a of the transfer device 23, the encoder 58b of the traverse device 24, the motor encoder 33 and the cross device 40 of the rail moving device 30 The detection signal of the displacement meter 43 is sent to the information processing device 13c for processing.

In the above, the rail moving device 30 has an actuator (motor) 32 provided with respect to the stand 4 and the rail frames 7 and 8 approach the rolling rolls 1a and 1a with respect to the stand 4. And rail moving means for moving in the disengaging direction, wherein the information processing device 13c, the control devices 13a, 13b, 13d, the encoders 33, 57a, 58b, and the displacement gauge 43 are provided at the cross angle of the rolling roll. Based on the related information, the rail frames 7 and 8 constitute means for controlling the drive of the actuator 32 so as to be parallel to the axis of the rolling roll.

In addition, the guide 9 is provided on the opposite stand 4, and constitutes guide means for supporting the rail frames 7 and 8 so as to be tiltable with respect to the stand, and the rail moving device 30 and the information processing device. (13c), control devices (13a, 13b, 13d), encoders (33, 57a, 58b), and displacement meters (43) keep the rail frames (7, 8) parallel to the axes of the rolling rolls (1a, 1a). The rail position control means which inclines the rail frames 7 and 8 with respect to the stand 4 so that the cross angle of a rolling roll may be followed may be comprised.

The guide 9, the information processing device 13c, the control devices 13a, 13b, 13d, the encoders 33, 57a, 58b by this; The displacement meter 43 maintains the moving direction of the grinding wheel 20 when the grinding units 5a, 5b and 6a, 6b move along the rail frames 7, 8 while being parallel to the axis of the rolling roll. Of the rolling roll so that the rail frames 7 and 8 are parallel to the axes of the rolling rolls 1a and 1a. Follow the cross angle and move.

Next, the operation of the on-line roll grinding device of this embodiment will be described with reference to FIG.

First, when an instruction for changing the cross angle of the work roll is issued from the upper control unit (not shown) (step 200), the hydraulic pressure is injected into the hydraulic chamber 44a of the cross apparatus 40 according to the instruction, and the cross block 41 is opened. The bearing box 3 is moved (steps 201 to 204). The work roll axis moves from Rc1 to Rc2, which is confirmed by the signal of the displacement gauge 43 (step 205). In response to the change of the cross angle, the grinding unit 5 is retracted before the work roll axis moves (step 206). After the movement of the work roll axis, the rail moving device 30 is instructed to move (step 207). The motor 32 is rotated (step 208) to move the rail frames 7 and 8 to be parallel to the work roll axis Rc2 (step 209). At this time, from the measured values of the displacement meter 43 and the motor encoder 33 of the rail moving device 30 having the parallelism between the rail frames 7 and 8 and the work roll axis Rc2 in the cross device 40. It confirms by 13c, and when it becomes parallel, a movement stops (step 210).

In this way, by moving the rail frames 7 and 8 so as to be parallel to the work roll axis, the grinding units 5 and 6 can be soft-deleted, similar to rolling machines that do not cross.

In the cross rolling machine, another embodiment for moving the rail frame following the cross angle of the rolling roll will be described with reference to FIG. In this embodiment, the rail frame 70 is brought into contact with the cross block 41 and the rail frame 70 is moved in accordance with the change of the cross angle.

That is, similarly to the above, the cross block 41 is moved by controlling the cross device 40 by the command of the upper control device, not shown. Both ends of the rail frame 70 having the rails 70a and 70b are brought into contact with the crossblock 41 via the spherical support portions 46a and 46b, and the crossblock 41 and the rail frame 70 follow. It presses with the cross following cylinder 45 to move. As a result, the rail frame 70 always moves in the horizontal direction as much as the crossblock 41 moves, and if there is no gap between the spherical supports 46a and 46b, the work roll axis Rc and the rail frame 70 Always parallel. The same applies to the other rail frame 80.

A third embodiment of the present invention will be described with reference to FIGS. 18 and 19. FIG. In this embodiment, the stopper means and the screw are installed in the rail moving means in the first or second embodiment, so that the inclination angle of the rotary wheel shaft or the parallelism of the rail frame and the rolling roll can be set precisely.

In FIG. 18, the rail moving device 30A includes a mechanical stopper 35, a screw shaft 34A provided with a screw 34 for moving the mechanical stopper 35, and a motor for rotating the screw shaft 34A. 32), the reduction gear 31 which decelerates the rotation of a motor and transmits it to the screw shaft 34A, the encoder 33 which detects rotation of the motor 32, and the upper surface of the rail frame 7 are integrally installed, and mechanical A stopper 71 for contacting the stopper 35 to position the rail frame 7 and a pin coupled to the rail frame 7, and pressing the rail frame 7 with a predetermined force toward the rolling roll 1a. The hydraulic cylinder 36 is comprised. The screw shaft 34A is rotatably supported via a bearing on the brackets 34a and 34b fixed integrally to the guide 9, and on the upper ends of the brackets 34a and 34b, an anti-rotation member of the mechanical stopper 35 34c) is installed. The reduction gear 31, the motor 32, and the hydraulic cylinder 36 are fixedly supported by the support plate fixed to the stand 4. As shown in FIG.

In the case of roll grinding by the roll grinding unit 5, a high pressure is introduced into the hydraulic cylinder 36, the stopper 71 is pressed against the mechanical stopper 35 with a relatively large force, and the rail frame 7 is positioned. At the same time, the grinding unit 5 is not retracted by the grinding reaction. The inclination of the rail frame 7 at this time is precisely maintained by the mechanical stopper 35. When the rail frame 7 changes the inclination, the pressure of the hydraulic oil introduced into the hydraulic cylinder 36 is reduced, and the pressing force of the stopper 71 to the mechanical stopper 35 is reduced. In this state, when the motor 32 is rotated, the mechanical stopper 35 moves back and forth by the rotation of the screw 34, and the rail frame 7 maintains the engagement between the mechanical stopper 35 and the stopper 71. Move forward or backward. Thereby, the inclination of the rail frame 7 changes to a desired angle by controlling the rotation amount and rotation direction of the motor 32 of the rail moving apparatus 30A of an operation side and a drive side. At this time, since the movement of the rail frame 7 is made by rotating the screw 34 while keeping the mechanical stopper 35 and the stopper 71 in contact, the rail frame 7 can be accurately positioned. . Thus, when applied to the first embodiment, the inclination angle of the rotary grindstone shaft 21 can be set precisely, and the rotary grindstone 20 can be stably controlled. In addition, when applied to the second embodiment, the parallelism between the rail frame 7 and the rolling roll 1a can be precisely maintained in accordance with the change of the cross angle.

At the time of roll replacement, the supply of the hydraulic oil of the hydraulic cylinder 36 is reversed, and the hydraulic cylinder 36 is contracted to move the rail frame 7 backward so that the rail frame 7 does not interfere with the bearing box.

In this embodiment, the screw shaft 34A is rotated by the rotation of the motor 32. A mechanism for moving the rod back and forth by the rotation of the motor 32 is provided, and the mechanical stopper 35 is provided on the rod. The same effect can also be obtained.

As described above, according to the present invention, since the vibration of the rolling roll is absorbed by the elastic body function of the flat disk of the grinding wheel, it is possible to perform accurate and good surface roughness without causing a shrinking phenomenon and resonance.

In addition, with one grinding unit, one grinding unit can grind from one end to the other end of the roll, and utilizes the ability of the grinding device to effectively roll the on-line rolling mill grinding machine with a small space and a small equipment cost. Can be installed on

In addition, since only the rail frame is moved, the grinding unit tracks the cross angle so that the rolling roll of the cross rolling machine can be easily ground, so that the rolling roll can be ground without causing a step between the plate part and the unsettled part in the rolling roll. This allows full schedule free rolling in cross rolling mills.

1 is a partial cross-sectional side view of a main portion of a rolling mill having an on-line rolling roll grinding device according to an embodiment of the present invention;

2 is a partial cross-sectional plan view of the rolling mill shown in FIG.

3 is a cross-sectional view of the grinding unit,

4 is a longitudinal sectional view of the grinding unit,

5 is a view showing the arrangement and structure of the grinding wheel and its oscillation groove, FIG. 6 is a view for explaining the control system of the on-line rolling roll grinding device.

7 is a view showing the interference between the grinding wheel and the stand in the case of grinding the rotary shaft of the grinding wheel inclined with respect to the perpendicular to the roll axis,

8 is an explanatory diagram of the inclination of the rail frame and the operation and control of the grinding unit when moving both ends of the rail frame;

9 is a flowchart showing the procedure of the control shown in FIG.

10 is an explanatory view of the inclination of the rail frame and the action and control of the grinding unit when supporting one end of the rail frame freely and moving the other end;

11 is a partial cross-sectional side view of a main portion of a rolling mill having an on-line rolling roll grinding device according to another embodiment of the present invention;

12 is a cross-sectional view taken along line XII-XII of FIG.

13 is a cross-sectional view taken along line XIII-XIII of FIG.

14 is a view showing the positional relationship of the grindstone in two grinding units;

15 is a view for explaining a control system of an on-line rolling roll grinding device;

16 is a flowchart showing a procedure of control for grinding by following a cross angle;

17 is a schematic view of an embodiment in which the rail frame is in contact with the cross block and the roll frame is followed to control the inclination of the rail frame;

18 is a partial sectional plan view of the main portion of a rolling mill equipped with an on-line rolling roll grinding device according to a third embodiment of the present invention;

19 is a cross-sectional view taken along line XIX-XIX in FIG.

Claims (33)

An on-line rolling roll grinding device installed in a rolling mill having one or more pairs of rolling rolls rotatably supported between opposing stands, comprising: a flat grinding wheel for grinding the rolling rolls; Drive means for rotating the rotary grindstone by a grindstone rotating shaft; Conveying means for pressurizing the grinding wheel on the rolling roll; One grinding unit comprising traverse means for moving the grinding unit along the rail frame and provided for at least one rolling roll; In an on-line rolling roll grinding device having a rail frame that supports the grinding unit to be movable in the axial direction of the rolling roll, The grinding wheel is installed on the grinding wheel rotating shaft and a substantially flat disk; Having an abrasive layer fixed to one side of the plate in a position outside the rotation radius of the plate axis, the plate plate being elastically bent relative to the axis of rotation to absorb vibration from the rolling roll. Be configured to act as an elastomer itself; The on-line rolling roll grinding device changes the inclination of the rail frame with respect to the stand while maintaining the moving direction of the grinding wheel when the grinding unit moves along the rail frame in parallel with the axis of the rolling roll. On-line rolling roll grinding device further comprising a rail inclined movement means. The method of claim 1, The rail tilt moving means includes: guide means installed on the opposite stand and supporting the rail frame in an inclined movement relative to the stand; Rail position control means for inclining the rail frame in an opposite direction with respect to the axis of the rolling roll when the grinding unit is in a position for grinding one end side of the rolling roll and in a position for grinding the other end side; On-line rolling roll grinding device comprising a grinding wheel position control means for maintaining the moving direction of the grinding wheel when the grinding unit is moved along the rail frame in parallel to the axis of the rolling roll. The method of claim 2, The rail position control means includes: an rail moving means having an actuator provided with respect to the stand and moving the rail frame with respect to the stand in a direction of approach and departure of the rolling roll; And means for controlling the driving of the actuator so that the moving direction of the rail frame is reversed when the grinding unit is in the position of grinding one end side of the rolling roll and in the position of grinding the other end side. On-line rolling mill grinding machine. The method of claim 3, And said rail moving means further comprises a stopper means for positioning said rail frame when said rail frame is moved in the approaching and disengaging direction of said rolling roll by said actuator. The method of claim 3, The rail moving means includes a screw that rotates by the actuator; A stopper moving in a direction of approach and departure of the rolling roll by rotation of the screw; On-line rolling roll grinding device further comprising a hydraulic cylinder for maintaining the rail frame in contact with the stopper. The method of claim 2, The grindstone position control means drives the grindstone feeder and traverse device so that the rotating grindstone moves in parallel with the axis line of the rolling roll regardless of the distance between the rail frame and the rolling roll due to the inclination of the rail frame. On-line rolling roll grinding device characterized in that the means. The method of claim 1, And the abrasive layer comprises cubic boron nitride abrasive grains or diamond abrasive grains. An on-line rolling roll grinding apparatus mounted on a cross rolling mill for rolling by cross-wise rotating one or more pairs of rolling rolls supported between opposite stands in a horizontal direction, comprising: two or more grinding units provided for one or more rolling rolls; ; A rail frame supporting the grinding unit to be movable in the axial direction of the rolling roll, wherein the grinding unit includes a flat rotary grindstone for grinding the rolling roll; Drive means for rotating the rotary grindstone by a grindstone rotating shaft; Conveying means for pressurizing the grinding wheel on the rolling roll; In the on-line rolling roll grinding device having a traverse means for moving the grinding unit along the rail frame, The rotary grindstone is provided on the grinding wheel rotating shaft and has a substantially flat disc and an abrasive layer fixed to one side of the flat disc at a position outside the rotation radius of the rotation axis of the flat disc, and the flat disc is rolled Is configured to bend elastically about the axis of rotation so as to absorb vibrations from the roll so that it acts as an elastic body itself; Further comprising rail inclined movement means for changing the inclination of the stand of the rail frame while maintaining the moving direction of the grinding wheel when the grinding unit is moved along the rail frame parallel to the axis of the rolling roll. On-line rolling roll grinding device characterized in that. The method of claim 8, And said rail tilt moving means is a following moving means for moving said rail frame following the cross angle of said rolling roll so that said rail frame is parallel to the axis line of said rolling roll. The method of claim 8, The rail tilt moving means includes: guide means installed on the opposite stand and supporting the rail frame in an inclined manner relative to the stand; On-line rolling roll grinding device comprising a rail position control means for inclining the rail frame relative to the stand by following the cross angle of the rolling roll so that the rail frame is parallel to the axis of the rolling roll. . The method of claim 10, The rail position control means has an actuator installed on the stand, the rail moving means for moving the rail frame in the approaching and disengaging direction of the rolling roll with respect to the stand; And means for controlling the drive of the actuator so that the rail frame is parallel to the axis of the rolling roll based on the information about the cross angle of the rolling roll. The method of claim 10, And said rail moving means further comprises a stopper means for positioning said rail frame when said rail frame is moved in the approaching and disengaging direction of said rolling roll by said actuator. The method of claim 10, The rail moving means includes a screw that rotates by the actuator; An on-line rolling roll grinding device further comprising a stopper moving in the approaching and disengaging direction of the rolling roll by the rotation of the screw, and a hydraulic cylinder for keeping the rail frame in contact with the stopper. The method of claim 8, The rail tilt moving means includes: a cross block provided at each of the opposed stands and contacting and pressing a bearing box supporting both ends of the rolling roll; And rolling rail means for contacting both ends of the rail frame to the cross block to allow the rail frame to move integrally with the cross block. The method of claim 8, And the abrasive layer comprises cubic boron nitride abrasive grains or diamond abrasive grains. The method of claim 8, The grinding wheel is an on-line rolling mill grinding device, characterized in that the contact line between the abrasive layer and the rolling roll is arranged so as to be formed only on one side when viewed from the center of the grindstone. The method of claim 1, The plate disk has an online rolling roll grinding device, characterized in that it has a spring constant of 1000kgf / mm to 30kgf / mm. The method of claim 1, The flat disk is an online rolling roll grinding device, characterized in that it has a spring constant of 500kgf / mm to 50kgf / mm. The method of claim 8, The plate disk has an online rolling roll grinding device, characterized in that it has a spring constant of 1000kgf / mm to 30kgf / mm. The method of claim 8, The flat disk is an online rolling roll grinding device, characterized in that it has a spring constant of 500kgf / mm to 50kf / mm. An on-line rolling mill grinding apparatus for rolling mills having a rolling roll which can be rotated and ground around a rolling roll axis, A grinding wheel having a grinding wheel side and elastically bent with respect to the grinding wheel axis and having an abrasive material in an outer circumferential region of the grinding wheel; A body for rotatably supporting the rotating grindstone through a bearing; A rotating grindstone driver for driving the rotating grindstone; It is a mechanism that moves the body substantially parallel to the axis of the rolling roll to be ground by the grinding wheel while adjusting the angular inclination of the grinding wheel and the rolling roll axis so that the shaft position of the grinding wheel is along the axis length of the rolling roll. Rolling roll grinding apparatus, characterized in that made. The method of claim 21, The rotary grindstone has a substantially flat disk installed on the grindstone rotating side and an abrasive layer fixed to one side of the flat disk at a position outside the rotation radius of the rotation axis of the flat disk, wherein the flat disk is An on-line rolling mill grinding apparatus, characterized in that it is configured to bend elastically with respect to the axis of rotation so as to absorb vibrations from the rolling rolls so that they themselves act as elastic bodies. The method of claim 21, The rolling mill includes a stand at each opposite end of the rolling roll, The body is supported by a rail frame extending and supported between the stands, And the mechanism includes an adjustable connecting member disposed between each end of the stand and each end of the rail frame. The method of claim 23, wherein The rotary grindstone has a substantially flat disk installed on the grindstone rotating shaft, and an abrasive layer fixed to one side of the flat disk at a position outside the rotation radius of the rotating axis of the flat disk, wherein the flat disk is rolled. An on-line rolling mill grinding apparatus, characterized in that it is configured to bend elastically with respect to the axis of rotation so as to absorb vibrations from the roll and act as an elastic body itself. The method of claim 2l, The rolling mill has at least one pair of rolling rolls rotatably supported by a stand and the rolling rolls are cross rolling mills that can cross each other, The grinding apparatus is on-line rolling roll grinding device, characterized in that it comprises two of the grinding wheel for the rolling roll to be ground. The method of claim 25, Each of the grinding wheels has a substantially flat disk provided on the grinding wheel side, and an abrasive layer fixed to one side of the flat disk at a position outside the rotation radius of the rotation axis of the flat disk, wherein the flat disk On-line rolling roll grinding device, characterized in that it is elastically bent about the axis of rotation so as to absorb vibrations from the rolling rolls so that they themselves act as elastic bodies. The method of claim 25, The body for each of the two grinding wheels is supported by a rail frame extending between the stands supporting the rolling rolls, and the body is associated with the grinding wheel side inclined at different angles with respect to the rotation axis of the rolling rolls to be ground. Supported with, On-line rolling roll grinding device, characterized in that the adjusting means for changing the angle of the rail frame to be parallel to the rotation axis of the rolling roll to be ground. The method of claim 27, Each of the rotating grindstones includes a substantially flat plate disc provided on the grinding wheel side, and an abrasive grain layer fixed to one side of the plate disc at a position outside the rotation radius of the rotation axis of the plate disc, wherein the plate disc An on-line rolling mill grinding apparatus, characterized in that it is configured to bend elastically with respect to the axis of rotation so as to absorb vibrations from the rolling rolls so that they themselves act as elastic bodies. The method of claim 21, The mechanism includes means for inclining the axis of the grinding wheel in a direction such that the outer circumference of the grinding wheel having the abrasive material is engaged with the rolling roll on one side of the grinding wheel corresponding to the adjacent end of the rolling roll. Rolling roll grinding device. The method of claim 29, The rotary grindstone has a substantially flat disk installed on the grindstone rotating shaft, and an abrasive layer fixed to one side of the flat disk at a position outside the rotation radius of the rotating axis of the flat disk, wherein the flat disk is rolled. An on-line rolling roll grinding device, characterized in that it is configured to bend elastically about the axis of rotation so as to absorb vibrations from the roll to itself act as an elastic body. The method of claim 23, wherein And said adjusting means is a member having a rotatable thread. The method of claim 21, The plate disk has an online rolling roll grinding device, characterized in that it has a spring constant of 1000kgf / mm to 30kgf / mm. The method of claim 21, The flat disk is an online rolling roll grinding device, characterized in that it has a spring constant of 500kgf / mm to 50kgf / mm.