JPS6199504A - Method and device for grinding roll in on-line - Google Patents

Abstract

PURPOSE:To prevent chattering caused by the increase of a clearance and to improve a grinding performance, by changing an opposite position to the roll surface of a grinding body in accordance with its wearing condition and keeping the clearance between the sliding parts of a frame and a supporting bed at an optional distance. CONSTITUTION:A supporting bed 25 is advanced, and is fixed to a stopping member 35 of guide plates 10a, 10b by pressing it against the member 35. Then the bed 25 is surely fixed to housings 9a, 9b. Next, rods are respectively moved to the stroke end of either of an advancing side or a retreating side by actuating the cylinder of a supporting device 26, to set and hold a wedge on and at a raising or lowering limit position. Next, when a plunger 23a is lowered, by supplying a hydraulic pressure to a cylinder 23, to press a roll against the bed 25, the lower surface of the front end of frame 5 comes into contact with the upper surface of wedge, and the lower sliding surface of the sleeve of a guide member 20 of frame 5 is finally brought into press contact with a guide rod 21. By adjusting the hydraulic pressure and the supplying quantity to the cylinder 23, the contact pressure between the sleeve and the guide rod 21 is adjusted to absorb a clearance. That is, the chattering of a grind stone 2 is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method and apparatus for online grinding of rolling mill rolls.

<Prior art> Schematic diagram of a conventional online roll grinding device Figs. 6 and 7
The diagram will be explained. FIGS. 6 and 7 respectively show a partially sectional front view and a plan view of an example of a conventional on-line grinding device. In the figure, reference numeral 2 indicates a grinding wheel which is a plurality of ten-shaped grinding bodies arranged in the axial direction of the roll to be ground (work roll in the illustrated case) 1, and each has a cylinder ( By alternately supplying hydraulic pressure from the flexible tubes 4 & I4b (not shown) to direction), and each grindstone 2 can be moved in and out of the
can be pressed onto the surface of the roll 1 with an arbitrary set pressure. Further, the frame 5 has a groove 6a of a guide member 6 protruding from the lower part thereof slidably fitted into a guide member 7a protruding from the upper part of the support base 7, and a groove 6a of the guide member 6 protruding from the lower part of the frame 5. By connecting the protruding granite 6c to a cylinder 8 fixed to the support base 7, it is possible to reciprocate in parallel to the roll axis.

Furthermore, the support stand 7 is connected to the rolling mill work side (W) and the drive m (D
) A pair of guide plates 10a protruding from the housings 9a and 9b.
, lOb, and is connected with a pin 15 via a bracket 14 to a pair of left and right hydraulic cylinders 13 installed on a noheaving or independent base 12 via a trunnion 1. The frame 5 and the support base 77 are integrally configured to be able to approach and separate from the roll 1 by means of the cylinder 13.

Thus, by using this device, the work roll 1
The grinding wheel 1 is assembled in the rolling mill housings 9a and 9b and rotated, and the grinding wheel 2 is reciprocated in the roll axis direction while pressing the grinding wheel 2 against the roll 1 surface with an arbitrary set pressure.
can be ground to the required roll profile. In this case, the cylinder 13 supports the pressing reaction force of the grinding wheel 2 against one surface of the roll during grinding while holding the entire grinding device at a predetermined advance limit position, and when changing the rolls, the cylinder 13 rapidly moves the entire grinding device. Interference with the roll chock (not shown) can be avoided by moving the roller backward to the rearward limit (the position indicated by the chain line in the figure).

<Problems to be Solved by the Invention> What is important in such grinding work is to prevent the grinding performance from decreasing due to chatter (vibration) and clogging of the grinding wheel, and from damage to the grinding wheel. In the above-described apparatus, chatter occurs between the grindstone 2 and the holder 3, between the holder 3 and the frame 5, between the frame 5 and the support stand 7, and between the support stand 7 and the guide plate 10.
a.

This occurs depending on the size of the gap between the sliding part and the job. Among these, the sliding surfaces of the frame 5 and the support stand 7 are exposed to high temperatures and water during rolling, especially in hot rolling mills, etc.
Due to the structure, it is extremely difficult to reduce the clearance to almost zero because it is exposed to a harsh environment where dust and other particles are scattered, and the backlash increases due to wear of the sliding members over long periods of use. This is unavoidable, and chattering of the grindstone 2 is likely to occur due to this. Also, the support stand 7 and the guide plate 10a.

Similar to the play between the frame 5 and the support base 7, a certain amount of play is unavoidable on the sliding surface with the job, but in this case, the entire grinding device is supported by the cylinder 13 by pressure on the roll surface. .

The occurrence of chatter in the grinding wheel 2 depends on the looseness of the sliding part.

The backlash due to wear at the pin J5 joint between the support base 7 and the cylinder 13 and at the trunnion J1 support portion of the cylinder 13 is also significant.

On the other hand, in the above-mentioned device, the grinding wheel 2 during grinding reciprocates while being pressed against the roll surface in a fixed direction, so as grinding progresses, the roll-to-roll portion (tip surface) 2 & of the grinding wheel 2 is worn. The entire surface of the grinding wheel comes into contact with the roll surface, which tends to cause clogging of the grinding wheel surface, which has the drawback of reducing grinding performance.

Therefore, as a means for preventing clogging 9, for example,
As shown in F356-14010, the grinding wheel group is reciprocated in the direction parallel to the roll axis and also reciprocated in the roll rotation direction C so that the grinding part is constantly brought into contact with a new grindstone surface. A method for preventing clogging has been proposed. However, in this method, the grinding wheel is pressed against the roll surface while moving in a synthetic reciprocating motion, that is, moving diagonally with respect to the roll axis, so the tip of the grinding wheel 2 has a vertical movement stroke H as shown in FIG. In between, the variable pressing reaction force corresponding to the maximum protrusion height S due to the roll arc surface /,
In addition to the 'i-setting pressing force, the force will be applied locally and additionally. For this reason, there is a drawback that the grindstone 2 is easily damaged.

Means for Solving the Problems> The present invention provides an online roll grinding method that prevents clogging and breakage of the grinding body, and also implements the entire method and eliminates unnecessary gaps between the frame and the support base. The object of the present invention is to provide an online cool grinding device that can prevent chatter from occurring.

The configuration of the online roll grinding method according to the present invention for achieving this purpose is to reciprocate a grinding body that is attached to a rolling mill and pressed against the entrance surface of a drive-rotating roll in a direction parallel to the axis of the roll. In the online roll grinding method, the roll facing surface of the grinding body is alternately moved forward and backward with respect to the rotational direction of the roll between the reciprocating movements, depending on the amount of wear of the grinding body. It is characterized by being moved to. Further, in the configuration of the online roll grinding ia according to the present invention, 7 frames are provided with a pressing mechanism for pressing the grinding body against the roll surface, and the 7 frames are supported so as to be movable back and forth in parallel to the roll axis. In an online roll grinding device having a support stand and a drive mechanism for moving the support stand toward and away from the roll, the frame is mounted on the support stand along a guide rod having an axis parallel to the roll axis. The reciprocating body is supported so as to be able to swing freely around its axis, and a support device that clamps the guide rod and regulates the swing angle of the support stand on both sides, and the support stand is attached to the support device. It is characterized by being provided with a push-up device for bringing it into contact.

In the method of the present invention, grinding is performed by sending the μ grinding body in a direction parallel to the roll axis, and when the wear of the grinding body has progressed to a certain point f, the position of the surface of the grinding body facing the roll is moved. Therefore, full-surface contact of the grinding body is avoided. In addition, in the present invention, the swinging angle of the support base can be changed by the support device, thereby moving the position of the surface of the grinding body facing the roll, and a support device and a push-up device are provided on both sides of the guide rod. So plan P
Since 3m is the fulcrum, unnecessary gaps between the sliding parts of the support stand and the frame are eliminated.

<Example> An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a front view of a grinding device for work rolls according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line AA in FIG. 1, and FIG.
The figure is a sectional view taken along line BB in FIG. In the following description, the same members as those in the conventional apparatus shown in FIGS. 6 and 7 are given the same reference numerals, and redundant description will be omitted.

In FIGS. 1 to 3, the frame 5 for the grinding body holder 3
A pair of guide members 20 extending perpendicularly to the axis of the roll to be ground are protruded in parallel in the roll axis direction at the lower part, and a through hole having the same axis parallel to the roll axis is provided approximately at the center of each guide member 20. Provide a hole. On the other hand, a bracket 32 is provided with a pair of guide rods 21 having the same axis parallel to the roll axis approximately in the center of the support base 25 and protruding from the support base 25.
The sleeve 20 is removably fixed to the guide C421.
The guide member 20 of the frame 5 is slidably supported in the axial direction of the frame 5 via the guide member a. The pair of guide rods 21 may be a single common rod. Further, as shown in FIG. 2, a reciprocating drive device 34 consisting of a double-acting hydraulic cylinder is fixed to the center of the support base 25, and both rods 33 are connected to opposite sides of the guide member 20 of the frame 5. By pressing the side surface of the guide member 20 alternately through the rod 33 by the drive of the reciprocating drive unit [34], the frame 5 is moved from the support base 25 along the rod 2J of the plan F1'3. It is possible to reciprocate in parallel to the roll wire.

Further, in the guide member 20 of the frame 5, a push-up device 22 is provided at the end IIfi opposite to the roll 1 with respect to the guide rod 21.
is installed. That is, the push-up device f22μ guide member 2
2. The plunger 23af: is inserted into and taken out from the hydraulic cylinder 23 recessed in the lower surface of the cylinder 23. At the tip of each plunger 231L, there is a concentric circle rotatably supported in the direction a parallel to the roll axis. Roller 24 with an arc-shaped tread
f: It is attached and can roll integrally with the frame 5 on the support stand 25. Although not shown, the plunger 231
L has a rotation prevention mechanism for the cylinder 23.

On the other hand, the guide plate joa protruding from How Song 9a and 9b,
The end of the support base 25 on the roll j side, which is slidably supported at both ends 25 & with an appropriate gap (this gap is preferably made as small as possible) from the lOb, has a protrusion extending in the roll axis direction. A portion 25b is formed, and a support device 26 with a lifting device is attached thereto. That is, guide plates 27 forming a pair of guides 27a are provided on both sides of the upper surface of the protrusion 25b on the same center line parallel to the roll axis, as shown in FIG.

Slanted liners 28 having sloped surfaces facing in opposite directions are fixed to the bottom of plan P'3@27a in a facing manner. Furthermore, wedges 29 are slidably placed on the inclined liner 28 on the guide g27a.

The lower surface of the wedge 29 that contacts the inclined liner 28 has an inclined surface corresponding to the inclined surface, so that the upper surface 29a of the wedge 29 is always kept horizontal. Also,
As shown in FIG. 1, the upper surface 29& of the wedge 29 has an arc-shaped cross section taken at right angles to its longitudinal axis.
& is slidably in contact with the lower surface of the end of the 7-frame 5 on the roll side, and is supported by the 7-frame 5. In addition, both sides
An opposed piston type cylinder 30 is mounted on a support base 25 in the middle of the
Both piston rods 30ai are fixedly supported and reciprocate in opposite directions, respectively! Connect to 29. Here, the screw thread 30m and @29 are connected via a connecting frame 31 so that the wedge 29 can freely move up and down along the inclined liner 28 during reciprocating motion.

In addition, the rolls of guide plates 10 & 10-b on both sides]
Stopper members 35 are fixedly installed at the top and bottom of the side tips, respectively, so that when the cylinder 3 side support base 25 is advanced to the roll J@, the roll 1 of both end members 25 & of the support base 25 is fixed.
The side end face abuts against the stopper member 35 to hold the support base 25 at the forward limit position.

In order to grind the roll 1 using the grinding device according to the present invention having the above-described configuration, first, the cylinder J3 is operated to advance the support base 25 and press it against the stopper members 35 of the guide plates Jot and JOb. Fix it. At this time, regardless of any looseness due to wear etc. of the trunnion ``J'' of the 7 cylinder j 3 attachment part or the connection 14, 15 between the 7 cylinder cylinder 3 and the support base 25, etc., the support base 25 should be reliably moved to the no. Can be fixed. Then, the 7 cylinders 30 of the support device 26 are operated to move the ronds 30B to the forward side (outside).
Alternatively, the wedge 29 is set and held at either the upper limit or lower limit position by moving it to either stroke end on the backward side.

In the case of FIGS. 1 to 3, the upper limit position is shown. In this case, the hydraulic pressure of the seven cylinders 23 of the lifting device 22 is set to a released state in advance. Next, hydraulic pressure is supplied to the cylinder 23 to push down the blunt gloss 23a and move the roller 24 to the support base 23.
When pressed onto the wedge 29, the guide rod 2J (circumference) is swung on the frame 5, and the lower surface of the guide rod 2J is connected to the rfi 29a on the wedge 29.
Finally, almost the lower sliding surface of the sleeve 20& of the frame 50 guide member 20 is pressed against the guide rod 21. Although not shown here.

Since the hydraulic pressure supply line to the cylinder 23 is equipped with a hydraulic pressure adjustment valve and an on/off valve, by appropriately adjusting the hydraulic pressure and supply amount to the cylinder 23, the pressure between the frame 5 and the wedge 29 and Due to the contact between the roller 24 and the support base 25, the contact pressure between the sleeve 20a and the guide rod 21 is appropriately adjusted to absorb the gap. That is, the reciprocating motion of the frame 5 and the two groups of grindstones during grinding is made smooth, and.

Adjust so that the minimum contact pressure is such that the grindstone 2 does not chatter.

Next, in accordance with a conventionally known procedure, the reciprocating drive device 34 is pressed while pressing the two groups of grinding wheels against the roll xrM with a predetermined set pressure.
Grinding is performed by reciprocating.

Thus, as the grinding work progresses, the grinding wheel tip 2a becomes the fourth
As shown in the figure, at the beginning of grinding H, there is almost linear contact with one surface of the roll, but as it gradually wears out, it becomes a striking contact.
If the grinding continues as it is, the entire surface will finally come into contact with the fpr line 36, but before this happens, the contact arc length 37 between the roll 1 and the grinding wheel 2 must be within the appropriate value. In a certain state, that is, in a state where the grinding wheel 2 is at its natural value (in the dropout area), the reciprocating movement of the grinding wheel 2 is stopped. After releasing the hydraulic pressure, the rods 30JL of the seven cylinders 30 of the support device 26 are moved to the opposite (inside in FIG. 3) stroke ends to hold the wedge 29 at the lower limit position.Hereafter, the same as above. Operate the push-up device 22 according to the procedure.

Frame 5. That is, positioning is performed by tilting the grindstone group. In Figure M4, the grindstone 2 shown by the solid line is set at the new upper and lower limits of the grindstone and grinding is started, and the wear state g is shown when the contact surface pressure decreases to near the limit of the overflow area, and the chain line indicates the upper limit of the grindstone. It represents the location. Further, θ is the maximum swing angle of the frame 5. Next, the grinding wheel 2 is advanced again by a conventionally known procedure and pressed against the roll 1, and the arc length 38 (the fourth After grinding is continued until the grinding wheel is worn to the broken part in the figure, the reciprocating motion of the grinding wheel 2 is stopped and the vertical position of the grinding wheel 2 is switched again according to the above procedure, and this process is repeated thereafter.

In this way, by alternately moving the attachment position of the grindstone 2 up and down with respect to the roll 1, at least before the grindstone tip 2a wears down to full contact state, the grindstone tip 2a is always held in a partial contact state. It can be ground by grinding. FIG. 5 is an explanatory view showing a typical example of the state of wear at the tip of the grinding wheel in the grinding device of the present invention. According to the present invention, the grinding wheel 2 gradually wears out in the shape of a mountain 39.

In the above explanation, since the frame 5μ support base 25 is reciprocated on the IT support base 25 that is inclined upwardly or downwardly with respect to the upper surface of the frame 5μ support base 25, the sliding between the wedge 29 that is the support part of the IT support base 25 and the 7th frame 5 is Although the moving surfaces and the rolling surfaces of the support base 25 and the roller 24 are not parallel to each other, this is not a problem because the upper surface of the wedge 29 and the tread surface of the roller 24 are made arcuate.

In the above-mentioned embodiment, a support device 26 with an elevating mechanism using a wedge 29 is provided at the tip (roll) side of the frame 5, and a pushing device 221 using a planter with a roller is provided at the rear end. - However, it is also possible to install these in opposite positions from front to back. It is also possible to install the 7 cylinders 23 of the push-up device 22 on the support stand 25'flJVCM and manufacture the plunger 23& in the opposite direction.

Furthermore, in place of the wedge and hydraulic plunger of the issuing device 26 and the pushing-up device 22, for example, a power-driven screw shaft P or the like SF may be used.

<Effects of the Invention> As described above in detail with reference to one embodiment, according to the method of the present invention, the setting position relative to the roll surface is alternately moved and set in the front and rear sides of the roll rotation direction depending on the wear condition of the grinding body. In particular, since the tip of the grinding body can be ground in partial contact with the roll surface, the contact pressure of the grinding body against the roll can be maintained at an appropriate value or higher, and the tip of the grinding body can be ground in the eye and crack area. It is possible to significantly prevent clogging and clogging phenomena. Therefore, stabilization of grinding performance and efficiency can be obtained. On the other hand, since the roll contact surface of the grinding body does not move up and down with respect to the roll axis during reciprocating motion, it always receives only a predetermined set pressing force, unlike the conventional grinding body diagonal movement method.
'MF: Breakage accidents of the grinding body caused by fluctuations in the tactile shell can be eliminated, and the life of the grinding wheel can be extended.

In addition, according to the single-grinding device, the position of the roll pair on the same surface can be changed depending on the wear status of the grinding body, and the gap between the sliding part of the frame and the support base can be adjusted to any size. Since it can be held, chatter b caused by an increase in the gap can be prevented, and grinding performance can be improved.

[Brief explanation of drawings]

Figures 1 to 5 show an embodiment of the present invention. Figure 1 is a front view of a grinding device according to an embodiment of the present invention.
is a cross-sectional view taken along the line 0A-A in Figure 1, Figure 3 is a cross-sectional view taken along line B-B in the second area, Figure 4 is an explanatory diagram of machining, Figure 5 is an explanatory diagram of the state of wear of the grindstone, and Figure 6 is a conventional one. FIG. 7 is a partial cross-sectional front view of an example of an online roll grinding device, FIG. 7 is a plan view thereof, and FIG. 8 is a processing diagram FJA. In the drawing. 1 is a roll to be ground, 2 is a grindstone, 5 is a frame, 13 (2 cylinders, 21 is a plan 17'341°, 22 is a push-up device, 25 is a support stand, 26 is a support device, and 34 is a reciprocating brain movement device) .

Claims (2)

[Claims] (1) In an online roll grinding method in which the roll is ground by reciprocating a grinding body that is attached to a rolling mill and pressed against the surface of a drive-rotating roll in a direction parallel to the axis of the roll, the grinding body is An online roll grinding method characterized in that the position of the roll-opposing surface of the grinding body is alternately moved back and forth with respect to the rotational direction of the roll between the reciprocating movements according to the amount of wear. (2) A frame equipped with a pressing mechanism that presses the grinding body against the roll surface, a support base that supports the frame so as to be able to reciprocate in parallel to the roll axis, and the support base close to the roll. In an online roll grinding device having a drive mechanism for separating the rolls, the frame is supported on the support base so as to be able to reciprocate along a guide rod having an axis parallel to the roll axis and swing freely around the axis. The online roll grinding is characterized in that a support device that clamps the guide rod and regulates the swing angle of the support stand, and a push-up device that brings the support stand into contact with the support device are provided on both sides. Device.