JPH06246606A - Method and device for polishing backup roll - Google Patents

Abstract

PURPOSE:To easily execute the polishing in a short time where all divided rolls constituting a backup roll are made uniform. CONSTITUTION:A roll supporting shaft 5b where a divided roll 5a is left to be mounted is loaded in a recessed part 13a of a loading part 13 at the end of a roll supporting shaft where the opening surface is inclined to the grinding wheel side by about 45 deg., and the divided roll 5a is rotated by pressing a supporting idle roll 16 from the lower side which is slightly shifted to the side of a circular grinding wheel 10c from the right below, and by pressing a driving roll 22 from the upper side which is slightly shifted to the side of the circular grinding wheel 10c from the right above respectively for each divided roll 5a. First, the circular grinding wheel 10c is successively pushed in between the divided rolls 5a while being rotated, and the edges of the divided rolls 5a are polished, and then, the grinding wheel 10 is shifted in the transverse direction and the roll surfaces of the divided rolls are polished respectively. In the case of the divided roll 5a of eccentric adjustment type, the position of rotation of a lever 5c which is fixed to an eccentric metal is adjusted and fixed, and the distance between the centers of rotation of the respective circular grinding wheel and the roll is set equal to that of the central divided roll which is not of eccentric adjustment type.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a backup machine capable of polishing a plurality of split rolls constituting a backup roll used in a cluster type rolling mill while they are attached to a roll support shaft. The present invention relates to a roll polishing method and an apparatus suitable for carrying out this method.

[0002]

2. Description of the Related Art A cluster type rolling mill incorporating rolls in multiple stages has been used for a long time for cold rolling of metal strips such as steel strips, and cold rolling of ultra-thin metal strips, which has been in increasing demand in recent years. More and more widely used for etc. An example of roll arrangement of such a cluster type rolling mill and the structure and operation of various rolls will be briefly described with reference to the drawings. FIG. 8 is an explanatory view showing the roll arrangement and roll action of an example of a cluster type rolling mill, FIG. 9 is a schematic cross-sectional explanatory view of a straight roll, FIG. 10 is a schematic explanatory view of a backup roll, and FIG. It is a schematic layout of a roll polishing device. For example, the 12-high cluster type cold rolling mill 1 includes, as shown in FIG. 8, one work roll 2 and two intermediate rolls 3 on both sides of the metal strip passage m in order from the metal strip passage m side. , Three backup rolls (the central backup roll 4 and the backup rolls 5 before and after it) are sequentially stacked. The work roll 2 directly contacts the metal strip and cold-rolls it, the backup rolls 4 and 5 are sources for applying pressure to the work roll 2 by the reduction force, and the intermediate roll 3 is a roll. In between, it works to transmit the rolling force of the backup rolls 4, 5 to the work roll 2.

Generally, in the cold rolling of a metal strip, the pressure applied to the metal strip is not uniform in the width direction (since the rolling force is usually applied to both ends of the backup roll, the pressure on both ends of the backup roll is lower than that on the center). Therefore, the metal strip forms a so-called crown shape with uneven thickness in the width direction. When further cold rolling with such a material as a raw material by a multi-stage rolling mill, the distance between the center of the roll support shaft 5b of the backup roll 5 and the load point P (contact point between the backup roll 5 and the intermediate roll 3) is set. By making them different in the width direction according to the crown of the raw material, it is possible to prevent the phenomenon such as uneven elongation in the width direction during cold rolling. Therefore, as shown in FIG.
Roll body 6a and roll shaft with uniform roll diameter as shown in
The straight roll 6 integrated with 6b is used, but the backup rolls 4 and 5 are as follows in order to enable adjustment of the distance between the center of the roll support shaft 5b and the load point P. There is. That is, as shown in FIG. 10, the front and rear backup rolls 5 are an odd number (normally 5 or 7) of three or more divided rolls 5a having a narrow width and a uniform diameter (of which, in particular, the central divided roll 5a 'is distinguished. ) Is rotatably attached to the roll support shaft 5b at a predetermined interval. Up to this point, the central backup roll 4 has the same structure. As shown in FIG. 8, the split rolls 4a having the same number and the same diameter as the split rolls 5a of the front and rear backup rolls 5 are rotatably attached to the roll support shaft 4b. Has been.

Regarding the front and rear backup rolls 5,
Further, each of the split rolls 5a except the central split roll 5a 'has a multi-layered structure including an eccentric metal 5aa having an eccentric thickness cylindrical shape as shown in FIG. 8, for example, a needle bearing in order from the eccentric metal 5aa toward the inside. And an inner metal (not shown above) are arranged, and the inner ring, roller bearings (not shown above) and outer ring 5ab (this is a split roll 5a) are arranged in this order toward the outside.
Which forms the outermost layer and forms a roll surface), and therefore the eccentric metal 5aa and the outer ring 5ab are rotatable. Then, on the side surface of the eccentric metal 5aa, an eccentricity adjustment lever 5c (this eccentricity adjustment lever is shown in FIG.
As shown in, the short adjustment lever 5
c ') is attached to this eccentricity adjustment lever 5c, 5
Rotational position around the roll center line of c ', that is, eccentric metal 5a
The amount of protrusion of the split roll surface (including a negative case with respect to the roll surface of the central split roll 5a 'as a reference) is adjusted by the rotational position of a (to be precise, the amount of protrusion is the split roll 5a). The center of rotation of the eccentric metal 5aa and the center of the intermediate roll 3, the center of rotation of the central split roll 5a '(in this case the center of the roll support shaft 5b) and the center of the intermediate roll 3. The difference in distance between

Since the central split roll 5a 'of the front and rear backup rolls 5 uses its roll surface as a reference roll surface when setting the projecting amount of the other split roll 5a, the eccentricity adjusting structure as described above is not necessary. (However, roll support shaft 5b
The bearing structure for free rotation is built-in, but not shown). Further, the reason why each split roll 4a of the central backup roll 4 is a split roll but does not have an eccentricity adjustment structure is used as a reference when adjusting the eccentricity of the front and rear backup rolls 5 and simplifies the structure of the entire apparatus. This is because. The edges of the divided rolls 4a, 5a, 5a 'of the backup rolls 4, 5 are tapered to prevent the roll metal plate from having roll marks. Even in the cluster type rolling mill in which the backup rolls 4 and 5 are incorporated, the backup rolls 4 and 5 are worn and damaged as the number of times of rolling increases. Therefore, it is necessary to polish the roll surface and the edge (tapered portion) at appropriate times. And

Conventionally, roll polishing has been performed on a straight roll 6 as shown in FIG. 9, and as shown in FIG. 11, a roll end holding rotary table 8 fixed on a polishing bed 7 and an extension line of its central axis. It is carried out by a polishing device composed of a roll end support moving table 9 for moving the roller and a whetstone driving device 10.
A diamond dresser 11 is often added to the polishing apparatus. The straight roll 6 has one end gripped by a chuck attached to the drive shaft of the roll end gripping rotary base 8 and the other end having a central axis on the extension line of the central axis of the drive shaft of the roll end gripping rotary base 8. It is rotatably attached to the support portion of the roll end support moving base 9 which is movable on the extension line of the central axis. As shown in FIG. 11, the grindstone driving device 10 includes a roll of the straight roll 6 which is gripped between the center axis extension line (roll end grip rotation base 8 and roll end support moving base 9), that is, in the polishing position. The same applies to the axis), and a grindstone mounting carriage 10a that reciprocates in parallel with the grindstone mounting carriage 10a, and moves on a substantially horizontal plane in a direction perpendicular to the roll axis of the straight roll 6 in the grinding position on the grindstone mounting carriage 10a. Possible whetstone mounts 10
b, and a circular grindstone 10c mounted on the grindstone mount 10b and rotated by an electric motor 10d along a plane perpendicular to the roll axis. For polishing the straight roll 6, the position of the grindstone mount 10b is adjusted so that the tip of the circular grindstone 10c is at an appropriate position for polishing with respect to the roll surface of the straight roll 6 in the polishing position, and the straight roll 6 and the circular shape are rounded. This is done by reciprocating the grindstone mounting carriage 10a in parallel with the straight roll 6 while rotating the grindstone 10c together. Since the circular grindstone 10c is often worn unevenly by roll polishing, the normal grindstone 10c
A diamond dresser 11 having an inverted shape corresponding to a predetermined shape on the peripheral surface of 10c is installed. This installation position is often taken as an extension of the straight roll 6 in the polishing position, as shown in FIG. 11, so that the grindstone driving device 10 can be moved as it is in the roll axial direction to perform the orthopedic polishing.

Of course, such polishing of the straight rolls 6 is carried out one by one.
Conventionally, a and 5a 'are also removed from the roll support shafts 4b and 5b, and are individually polished according to the polishing method of the straight roll 6. That is, taper portions are provided on both sides of the peripheral surface of the circular grindstone 10c, the flat portion of the peripheral surface of the split roll 5a is the same as the straight roll 6, and the tapered portion of the edge is the circular grindstone.
The amount of feed of 10c to the roll support shafts 4b, 5b side was made larger than when polishing flat parts, and polishing was performed by the taper part of the circular grindstone 10c. However, in such a method, the diameter is likely to vary between the divided rolls 4a and between the 5a and 5a ′, and it is a very difficult work that requires a lot of time and labor to obtain a uniform diameter. .

[0008]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned drawbacks of the prior art and grinds the roll surfaces and edges of all the divided rolls constituting one backup roll so that the roll diameters are uniform. It is an object of the present invention to make this possible easily in a short time.

[0009]

As a result of various studies, the present inventor moved a circular grindstone along the roll support shaft while all the divided rolls constituting one backup roll were attached to the roll support shaft. Can be polished
By specially configuring the method of supporting the roll support shaft and the method of rotating and driving each split roll during polishing, in the case of the eccentricity-adjustable split rolls, all split rolls are further aligned and fixed at a specific rotation position. The present invention has been completed by investigating what is possible.

The method and apparatus for polishing a backup roll according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a side view showing a cutaway part of an example of a backup roll polishing stand constituting a main part of a backup roll polishing device according to the present invention, and FIG. 3 is a front view of a part of the same, FIG. 4 is a side view of the inter-roll shaft gripping arm, FIG. 5 is an explanatory view of the positional relationship between the split roll, the drive roll and the support idle roll at the polishing position, and FIG. FIG. 7 is an explanatory diagram of the rotational position of each divided roll when polishing the backup roll, and FIG. 7 is an explanatory diagram of the positional relationship between the divided roll and the circular grindstone during roll polishing.

In carrying out roll polishing of the backup rolls 4 or 5 in the present invention as described above, first, all the divided rolls 4a or 5a, 5a 'are mounted on the roll support shaft 4b.
Or 5b with each divided roll 4a or 5
Split rolls 4a or 5 on roll support shafts 4b or 5b of a and 5a '
Both ends of the roll support shaft 4b or 5b are mounted on the roll support shaft end mounting portion 13 of the backup roll polishing base 12 described later so as to prevent the position movement of the a and 5a 'and to resist the load from the circular grindstone 10c. Put on. An example of the roll support shaft end mounting portion for performing such mounting will be described. A general view of the apparatus according to the present invention is shown in FIG. 11, in which a polishing bed 7, a grindstone driving device 10, and in most cases a diamond dresser are used.
11 is also installed as in the prior art, but the backup roll polishing stand 12 is mounted so that the backup roll 4 or 5 is placed at the polishing position of the straight roll 6.
Are mounted and fixed on the polishing bed 7. The backup roll polishing base 12 is provided with some important members, and the roll support shaft end mount 13 is one of them.

The roll support shaft end mounting portion 13 is a roll support shaft 5b.
(Hereinafter, the case of polishing the front and rear backup rolls 5 will be described unless otherwise specified) is a portion that horizontally supports both ends, and its shape is a semicircular recess 13 as shown in FIG.
a is a circular grindstone 10 in a cross section perpendicular to the horizontal roll support shaft 5b with its opening surface directed obliquely upward to the side of the circular grindstone 10c.
A standard polishing load line L ₃ connecting the center of c and the center of the roll support shaft 5b [as will be understood from the explanation with reference to FIG. 6 below, the polishing load line L _{6 in} the case of the eccentricity-adjustable split roll 5a is slightly different from L _3. (The distance from O ₃ to O ₁ is off by about 1 mm), but L ₃ is sufficient to consider the direction of the recess 13a]. In this way, the roll support shaft end mounting portion 13 has the above-described shape and inclination of the concave portion.
By having 13a, the roll support shaft 5b is supported from the back surface so as to sufficiently oppose the load received from the circular grindstone 10c.

In this way, both ends of the roll supporting shaft 5b are mounted on the roll supporting shaft end mounting portion 13 and the divided rolls 5
To prevent the position movement of a and 5a 'on the roll support shaft 5b,
As shown in FIG. 3, an inter-roll shaft gripping arm 14 is provided for each of the divided rolls 5a and 5a '. That is, the inter-roll shaft gripping arm 14 has a gripping arm shaft 15 fixed between the frames 12a on both sides of the backup roll polishing base 12 and each of the split rolls 5.
It is installed between a and 5a ', holds the roll support shaft 5b at a position between the divided rolls 5a and 5a', and divides the divided roll 5a.
It is for maintaining the distance between a and 5a ', and is configured to be detachable from the roll support shaft 5b, for example, as shown in FIG. That is, the lower end of the arm main body 14a is rotatably attached to the gripping arm shaft 15 fixed between the frames 12a on both sides of the backup roll polishing stand 12, and the inter-roll shaft support portion 14b is fixed to the upper end. A spacer piece 14c having a width corresponding to the length of the shaft between the rolls (not necessarily all the same) is attached to the upper side thereof in a hinge-like manner so as to be fastened by bolts and nuts 14d,
When the inter-roll shaft support portion 14b and the spacer piece 14c are aligned with each other, the roll support shaft 5b is shaped so as to form a hole for holding the roll support shaft 5b. The inter-roll shaft gripping arm 14 is normally rotatable around the gripping arm shaft 15 and is in a hanging state when not in use, but it may be fixed in a predetermined position and direction. Further, the width of the roll-to-roll shaft support portion 14b may be smaller than the length of the corresponding roll-to-roll shaft.

In order to prevent the movement of each of the divided rolls 5a and 5a 'on the roll support shaft 5b, first open the spacer piece 14c so that both ends of the roll support shaft 5b are placed on the roll support shaft end mounting portion 13
After being placed in the recess 13a of the spacer and the roll-to-roll shaft and the roll-to-roll shaft supporting portion 14b are brought into contact with each other, as shown in FIG.
Close 4c and fasten with bolts and nuts 14d. At the end of the roll support shaft 5b, as shown in FIG.
Since the roll supporting shaft end mounting portion 13 exists at the position a, the spacer piece 14c is attached to the roll supporting shaft end mounting portion 13 and is stabilized by its own weight.

When the work of mounting the backup roll 5 and preventing the movement of the position on the roll support shaft 5b is completed in this manner, then the divided rolls 5a, 5a 'are moved downward a little below the circular grindstone 10c side. While the rotatable support idler roll 16 is pressed against each other, and the driving roll 22 is pressed against each split roll surface from above slightly above the circular grindstone 10c side just above each split roll 5a, 5a '. Rotate. Rotating the split rolls 5a, 5a 'by surface drive is
Unlike the straight roll 6, the roll surface is the roll support shaft.
This is because it is rotatable with respect to 5b. Further, the supporting idle roll 16 is pressed against the lower parts of the split rolls 5a and 5a ', and this pressure contact is performed with the drive roll 22 from above, both in the direction slightly downward from above and slightly above the circular grindstone 10c side. a circular grinding wheel 10c than to substantially along a reference polishing load line L ₃ a resultant force direction of the pressure pressing the roll support shaft 5b on the roll support shaft end rests 13 direction from the two directions
This is to stabilize the polishing action of. In FIG. 5, the split rolls 5a and 5a ′, the supporting idle roll 16, and the drive roll 2
Center angles α, β formed between the pressure contact point with 2 and the radial ends Q ₁ , Q ₂
The larger the size, the better as long as the drive roll 22 does not come into contact with the circular grindstone 10c, but in practice it is 30 ° to 10 °.
Is preferred.

As a device for performing such an operation, the supporting idle roll 16 is constructed as follows. That is, as shown in FIG. 5, the position where the roll support shaft 5b is supported by the roll support shaft end mount 13 and the inter-roll shaft gripping frame 14 (not shown in FIG. 5) (this is called a polishing position). Of the backup roll 5 of the backup roll 5 in a section perpendicular to the roll support axis 5b of the split roll 5a ', that is, the reference polishing load line L connecting the center of rotation of the split roll 5a', that is, the center of the roll support axis 5b and the center of the circular grindstone 10c. ₃ polishing load line when the eccentric adjustable split roll 5a (L ₆ in FIG. 6) is shifted slightly to the reference polishing load line L ₃ as described above, but the support idling roller 16 and below driven roller 22 It is sufficient to use the reference polishing load line L ₃ to consider the pressure contact position.] A little from the radius end Q ₁ at a right angle downward to the circular grindstone 1
Shown is a supporting idle roll 16 provided for each of the divided rolls 5a and 5a 'so as to be rotatable, pressure-contactable and spaced-apart so as to support the roll surface on the 0c side from below.

A preferred specific example thereof is, as shown in FIGS. 1 and 3, a lower shaft fixed to the frame 12a (the gripping arm shaft 15 is shared in the illustrated example, but it may be provided separately).
A support idle roll 16 is rotatably attached to the tip of a lower arm 17 that is rotatably attached to the lower arm 17, and a lower end of the lower arm 17 is rotatably attached to a lower frame 12a at the center of the lower arm 17. The tip ends 18a of the cylinder rods of the lower cylinder 18 are rotatably connected, and the split rolls 5a and 5a 'located at the polishing position by the operation of the lower cylinder 18
The support idle roll 16 can be pressed against and separated from the support idle roll 16.

The drive means for rotating the split rolls 5a, 5a 'at the polishing position by surface driving as described above is constructed as follows. That is, as shown in FIG. 5, the support in the same vertical section as described in the case of an idle roll 16 (with respect to the roll supporting shaft 5b), with respect to the reference polishing load line L ₃ slightly from perpendicular radial end Q ₂ above Circular whetstone 10c
The drive roll 22 is provided for each of the divided rolls 5a and 5a ′, which is press-contactable and separable and is provided for pressing the side roll surface from above and rotating it by surface drive, and a drive device for this drive roll 22. It is configured.

A preferred specific example will be described. As shown in FIGS. 1, 2 and 3, a backup roll polishing rack
An upper shaft 19 is rotatably attached to the upper part of 12 frames 12a, and an intermediate drive roll 20 is fixed to a position on the upper shaft 19 corresponding to each of the split rolls 5a and 5a ′ in the polishing position. . The drive roll support arm pieces 21a are rotatably mounted on the upper shaft 19 on both sides of the intermediate drive rolls 20 to form a set of drive roll support arms 21, and the end portion on the circular grindstone 10c side thereof. A drive roll 22 is rotatably attached to the frame, and the frame 12 is attached to the opposite end.
The tip 23a of the cylinder rod of the upper cylinder 23, which is rotatably supported by a, is rotatably connected. The drive mechanism and device of the drive roll 22 are as follows.
As shown in FIG. 3, the drive roll 22 has split rolls 5a, 5
A driving surface 22a that comes into pressure contact with a'and a belt hanging surface 22b formed in a recess closer to the roll center side than the driving surface 22a are provided. The belt hanging surface 22b and the intermediate driving roll 20 are provided.
A belt 24 is stretched over and as shown in FIG. A belt 26 is stretched around one end of the upper shaft 19 and the electric motor 25. In the drive means having such a configuration, when the drive roll 22 is in pressure contact with the split rolls 5a and 5a ′, only the drive surface 22a is in pressure contact with the split rolls 5a and 5a ′, and the belt hanging surface 22b.
Is not in pressure contact with the split rolls 5a, 5a ', and the intermediate drive roll 20 and the drive roll support arm 21 rotate about the same upper shaft 19, so the drive roll 22 is an intermediate drive roll.
The belt 24 is stretched between the belt 20 and the belt 20, and further, while being rotated by the driving force of the electric motor 25 transmitted through the intermediate drive roll 20, the upper cylinder 23 is actuated to the split rolls 5a and 5a '. It can be pressed and separated freely, and by rotating the drive roll 22 in the pressed state, the split rolls 5a and 5a 'at the polishing position can be rotated.

When the object to be polished is the central backup roll 4, a circular grindstone 10 which will be described later from the above-mentioned pressure contact rotation state.
If you enter the polishing operation by c, in the cross section perpendicular to the roll support shaft 5b, the distance between the center of one common circular grindstone 10c and the rotation center of the divided rolls 4a (hereinafter, circular grindstone-roll center distance) The rotation center of the split roll 4a is the center of the roll support shaft 5b, so all split rolls 4a
Since the distance between the circular grindstone and the rotational center of the roll is the same, it is ground to a uniform diameter.

However, when the object to be polished is the front and rear backup rolls 5, as described above, the split rolls 5a other than the central split roll 5a 'are of the eccentricity adjusting type having the structure of a plurality of layers including the eccentric metal 5aa. Since it is a split roll, depending on the rotating position of the eccentric metal 5aa, a circular grindstone-
Since the distance between the centers of rotation of the rolls is different, it is not possible to polish the backup roll 4 in the center to a uniform roll diameter. Therefore, for the eccentricity adjustment type divided rolls 5a, it is necessary to perform eccentricity adjustment so that the distance between the circular grindstone-roll rotation center is equal among all the eccentricity adjustment type divided rolls 5a, but the central division roll 5a '. With respect to No. 3, the distance between the circular grindstone and the roll rotation center does not differ depending on the roll rotation position. Therefore, in order to grind all the divided rolls 5a and 5a ′ so as to have a uniform diameter, all the eccentricity-adjustable divided rolls 5a in the state where the roll support shaft 5b is mounted on the backup roll polishing mount 12 are used. It is sufficient to adjust the eccentricity so that the distance between the circular grindstone and the center of rotation of the roll is equal to that of the central divided roll 5a '.

For that purpose, as shown in FIG. 6, a center point O ₃ between the center O ₁ of the eccentric metal 5aa and the center O ₂ of the roll supporting shaft 5b located at the center of the central dividing roll 5a 'is passed. adjustment of the rotational position of the center O _1, eccentric metal 5aa O ₂ is straight L ₅ perpendicular to the straight line L ₄ connecting to each divided roll 5a to pass through the center O ₄ of the circular grinding wheel 10c, i.e. roll support shaft The eccentric metal 5aa can be adjusted by rotating the eccentric metal 5aa around 5b by the eccentricity adjusting levers 5c and 5c '. The reason for this is that the triangle O ₁ O ₂ O ₄ is an isosceles triangle with the angle O ₁ O ₄ O ₂ as the apex angle, and therefore the central division roll 5a ′ and the circular grindstone-roll of the eccentricity-adjustable division roll 5a. Distance between centers of rotation O ₂ O ₄ (L ₃ ) and O ₁ O
₄ (L ₆ ) are equal to each other, and if eccentricity adjustment is performed for all of the plurality of eccentricity adjustment type divided rolls 5a in this way,
Since the center split rolls 5a 'are used as a reference, all the split rolls 5a, 5a' have the same circular grindstone-roll center-to-center distance, and this eccentric state is adjusted to the end of the eccentricity adjusting levers 5c, 5c '. It is possible to polish to a uniform roll diameter by fixing and fixing and performing a polishing operation.

In this way, the eccentricity adjustment lever 5 is adjusted by eccentricity adjustment for the divided rolls 5a other than the central divided roll 5a '.
When c and 5c ′ are fixed and polished, the central dividing roll 5a ′ does not have an eccentricity adjusting lever, so in some cases, the backup roll 5 as a whole may vibrate during polishing and the polishing accuracy may decrease. is there. Therefore, in polishing, as shown by the alternate long and short dash line in FIG. 10, it is necessary to attach a fixing lever 5c ″ similar to the eccentricity adjusting lever 5c to the central dividing roll 5a ′ and fix the end portion to perform polishing. As an apparatus for carrying out the method for polishing the front and rear backup rolls 5 described above, the apparatus used for polishing the central backup roll 4 described above is used as it is, and eccentric except for the central dividing roll 5a '. The following members are additionally provided so that they can be used also for polishing the backup rolls 5 before and after the adjustable split rolls 5a are placed: that is, the backups before and after being mounted on the backup roll polishing base 12. The split rolls 5a other than the central split roll 5a 'of the roll 5 have their eccentricity adjusting levers 5c, 5c as described above with reference to FIG.
As shown in FIG. 1, the locking portions 27 and 28 for locking the tips of the eccentricity adjusting levers 5c and 5c 'so that the rotational position of c'is adjusted, except for the central split roll 5a'. The backup roll polishing pedestal 12 is provided for every divided roll.

The locking portion 27 for the long eccentricity adjusting lever 5c is, for example, as shown in FIGS. 3 and 1, provided between a fixed plate 27a provided at a corresponding position on the frame 12a and the fixed plate 27a. The rotating piece 27b is rotatable so as to sandwich the end of the eccentricity adjusting lever 5c, and the rotating piece 27b is fixed by the pin 27c. Further, the short eccentricity adjusting lever 5c ′ locking portion 28 is provided with a frame 12a as shown in FIG. 3, for example.
Of the short eccentricity adjusting lever 5c ', which is formed of a through hole 28a and a locking pin 28b which are formed at the corresponding positions of the notch (the eccentricity adjusting lever 5 shown in FIG. 8 and the like).
The shapes of the ends of c and 5c 'are derived from the eccentricity adjusting mechanism in the cluster type rolling mill which does not require detailed description in the present invention) and are locked.

The eccentricity adjustment lever 5 is also attached to the central split roll 5a '.
When a fixed lever 5c ″ similar to c is attached and polished, a locking portion 28 similar to the above is provided to fix the tip of the fixed lever 5c ″.
Of course, it can be shared even when not used. Generally, the amount of eccentricity of each divided roll 5a (distance between O ₁ and O ₂ in FIG. 6) is equalized for each backup roll 5, so that the total amount when the eccentricity is adjusted as described above. The eccentricity adjusting levers 5c and 5c 'are aligned in a straight line when viewed from the side as shown in FIG. 1, and therefore the locking portion 28 is also usually provided in a straight line on the frame 12a.

To summarize the above-mentioned preparation steps, first, the backup rolls 4 and 5 (hereinafter, the backup roll 5 will be described as a representative) are mounted on the backup roll polishing mount 12 at predetermined positions. The backup roll polishing base 12 is mounted and fixed so that the backup roll 5 mounted in this manner is at the position of the straight roll 6 in the polishing position described with reference to FIG. There is. Then, for all the split rolls 5a, 5a ', adjust the eccentricity so that the distance between the center of rotation of the circular grindstone and the rolls is uniform, and fix each end of the eccentricity adjustment levers 5c, 5c', 5c ". After the roll is the backup roll 4 in the center, of course, this is not done), and then the polishing work is finally started with the circular grindstone 10c. As described above, the supporting idle roll 16 is pressed against the divided rolls 5a and 5a 'from below. Then, the driving roll 22 is pressed against the upper part while rotating (it may be rotated after being pressed), and thus the divided rolls 5a and 5a 'are brought into contact with each other under pressure and rotated. Backup roll 5
While rotating along a plane perpendicular to the roll support shaft 5b, first the outer side of the outermost split roll 5a and the split roll
The circular grindstone 10c is sequentially pushed in between the spaces 5a and 5a 'to grind the edges of the divided rolls 5a and 5a'. As shown in FIG. 7, the circular grindstone 10c used in the present invention is the same as the prior art in that a parallel surface 10ca parallel to the grindstone rotation axis and tapered surfaces 10cb are formed on both sides of the circular grindstone 10c. However, the width L ₁ of the parallel surface 10ca is smaller than any of the divided roll intervals L ₂ of the backup roll 5, and the tapered surface 10cb
Even if the circular grindstone 10c is pressed between the split rolls having the widest split roll interval L ₂ , the width is sufficient to abut the entire taper portion 5ad of the edge of each split roll 5a (and / or 5a ′). The feature is that it has. Also, the taper of the split rolls 5a, 5a ', and hence the circular grindstone 10c, is 1 /
A gradient of around 100 is preferred. With such a configuration of the circular grindstone 10c, the taper portions of the edge portions of all the split rolls 5a and 5a 'are polished to a predetermined gradient.

Next, the circular grindstone 10c is reciprocated along the roll supporting shaft 5b while keeping the distance between the parallel surface 10ca at the tip of the split roll and the roll supporting shaft 5b of the backup roll 5 constant. The flat portion 5ac on the peripheral surface of each of the divided rolls 5a, 5a 'is ground to make the distance between the circular grindstone-roll center of rotation equal to that of all divided rolls 5a.
The diameters of a and 5a 'can be polished uniformly. In the polishing operation, a grinding liquid is supplied to a polishing portion for removal of polishing debris and cooling by a conventional method, and this supply is preferably performed from above the polishing load point.

In general, the roll polishing apparatus attached to the cluster type rolling mill equipment needs to polish not only the backup rolls 4 and 5 but also various straight rolls 6, and therefore, a polishing apparatus that can be commonly used for these is desirable. Therefore,
As described with reference to FIG. 11, with the installation position of the backup roll polishing pedestal 12 of the backup roll polishing apparatus described above interposed therebetween, the roll end holding rotary table 8 and the roll end support moving table 9 for polishing the straight roll 6 are provided. Is shown and the backup roll polishing stand 12 is attachable to and removable from the polishing bed 7. In order to make the backup roll polishing rack 12 attachable to and removable from the polishing bed 7, for example, as shown in FIG. 1, a frame 12a of the backup roll polishing rack 12 is provided with a hanging portion 12b for suspending and transporting. And the lower surface of the frame 12a and the polishing bed 7
Fitting parts 12c, 7a and mounting parts 12d, 7b for stabilizing the mounted state are provided in the and, and a fixture 29 and a retaining part 7c for fixing the mounted state are provided. Such a straight-roll polishing / polishing device effectively utilizes an existing straight-roll polishing device as shown in FIG. 11 to utilize the polishing bed 7 between the roll-end gripping rotary table 8 and the roll-end supporting moving table 9. The backup roll polishing base 12 may be mounted or modified so that it can be fixed. Further, by providing a bed having the same structure as the polishing bed 7 at another place and placing it on the bed during standby, the straight roll 6 can be polished. When polishing the backup rolls 4 and 5, if the backup rolls 4 and 5 are mounted, eccentricity adjusted, and fixed in a standby place, they are suspended and transported to a predetermined position, and placed and fixed. good.

[0029]

As described in detail above, according to the present invention, it is possible to mount all the divided rolls mounted on the roll supporting shaft on a polishing table and polish them with a circular grindstone. The mounting part is configured so that it can sufficiently oppose the load received from the grindstone, the rotation movement of each split roll is specially configured, and in the case of the eccentricity adjustable split roll, all split rolls are By making it possible by aligning and fixing the circular grindstone-roll rotation center to a specific rotation position such that the center-to-center distance becomes equal, it is extremely possible to uniformly polish the diameters of all the divided rolls that constitute the backup roll. It can be implemented easily and easily, and its industrial value is enormous.

[Brief description of drawings]

FIG. 1 is a side view showing a cutaway view of a part of an example of a backup roll polishing rack that constitutes a main part of a backup roll polishing apparatus according to the present invention.

FIG. 2 is a rear explanatory view showing an example of a backup roll polishing stand that constitutes a main part of the backup roll polishing apparatus according to the present invention with a part of it omitted.

FIG. 3 is a front explanatory view showing a part of an example of a backup roll polishing rack that constitutes a main part of the backup roll polishing apparatus according to the present invention.

FIG. 4 is a side view of an inter-roll shaft gripping arm.

FIG. 5 is an explanatory diagram of a positional relationship among a split roll, a drive roll and a support idle roll at a polishing position.

FIG. 6 is an explanatory diagram of the rotational position of each divided roll when polishing the front and rear backup rolls.

FIG. 7 is an explanatory diagram of a positional relationship between a divided roll and a circular grindstone during roll polishing.

FIG. 8 is an explanatory diagram showing roll arrangement and roll action of an example of a cluster type rolling mill.

FIG. 9 is a schematic cross-sectional explanatory view of a straight roll.

FIG. 10 is a schematic explanatory diagram of a backup roll.

FIG. 11 is a schematic layout diagram of a conventional general roll polishing apparatus.

[Explanation of symbols]

1 12-high cluster type rolling mill 2 Work roll 3 Intermediate roll 4 Central backup roll 4a Divided roll 4b Roll support shaft 5 Back and forth rolls 5a Divided roll 5aa Eccentric metal 5ab Outer ring 5ac Flat surface 5ad Circumferential edge Tapered part 5a 'Central split roll 5b Roll support shafts 5c, 5c' Eccentricity adjustment lever 5c ″ Fixed lever 6 Straight roll 6a Roll body 6b Roll shaft 7 Polishing bed 7a Fitting part 7b Placement part 7c Detention part 8 roll Edge gripping rotary base 9 Roll end support moving base 10 Grinding stone drive 10a Grinding stone mounting carriage 10b Grinding stone mounting base 10c Circular grinding stone 10ca Parallel surface 10cb Tapered surface 10d Electric motor 11 Diamond dresser 12 Backup roll grinding stand 12a Frame 12b Locking part 12c Joint part 12d Mounting part 13 Roll support shaft end mounting part 13a Semi-circular recess 14 Inter-roll shaft gripping arm 14a Arm body 14b Roll shaft support 14c Spacer piece 14d Bolt / nut 15 Grip arm shaft 16 Support idle roll 17 Lower arm 18 Lower cylinder 18a Cylinder rod tip 19 Upper shaft 20 Intermediate drive roll 21 Drive roll support arm 21a Drive roll support arm Piece 22 Drive roll 22a Drive surface 22b Belt hooking surface 23 Upper cylinder 23a Cylinder rod tip 24 Belt 25 Motor 26 Belt 27 Long eccentricity adjustment lever 27a Fixing plate 27b Fixing piece 27c Pin 28 Short eccentricity adjustment lever Locking part 28a Through hole 28b Locking pin 29 Fixing tool L ₁ Width of parallel surface of circular grindstone L ₂ Dividing roll interval L ₃ Standard polishing load line (straight line connecting O ₂ and O ₄ ) L ₄ O ₁ and O ₂ Straight line connecting L ₅ O ₃ and perpendicular to L ₄ L ₆ Polishing load line (O ₁ ,
Line connecting O ₄ ) m Metal band passage O ₁ Center of eccentric metal O ₂ Center of roll support shaft O ₃ Center point between O ₁ and O ₂ O ₄ Center of circular grindstone P Load points Q ₁ , Q ₂ Radial edge perpendicular to the standard polishing load line in the section of the split roll

Claims (8)

[Claims] 1. A circular grindstone in which an edge of each of the divided rolls of a backup roll, which is formed by inserting an odd number of three or more divided rolls into a roll support shaft and rotatably mounted at predetermined intervals, is rotated vertically. When polishing from almost horizontal direction, prevent the position movement of each split roll on the roll support shaft while keeping all the split rolls attached to the roll support shaft, and use both ends of the roll support shaft as backup roll polishing racks. It is placed so that it can withstand the load from the circular grindstone, and a little less than the position directly below it for each divided roll. Rotate each split roll by surface drive with the drive roll pressed against each split roll surface from above the circular grindstone side. While rotating the circular grindstone with the tapered portion along a plane perpendicular to the roll support axis,
First of all, the circular grindstone is pushed into each of the divided rolls and on the outer side of the outermost divided roll to polish the edge of each divided roll by the taper portion thereof, and then the circular grindstone is provided with a parallel surface of its tip and a roll support shaft. The method of polishing a backup roll, characterized in that the surface of all the divided rolls is polished by reciprocating along the roll support shaft while keeping the distance of the constant. 2. Each of the divided rolls except for the central divided roll in a state of being fitted into the roll supporting shaft has a structure of a plurality of layers including an eccentric metal having an eccentric thickness cylindrical shape, and a rotational position of the eccentric metal. In the case of an eccentricity adjustment type split roll that adjusts the amount of protrusion of the roll surface by the rotation position of the eccentricity adjustment lever attached to the side surface of the eccentric metal, the roll support shaft is mounted on the backup roll polishing stand. , The rotation position of the eccentric metal is adjusted for each divided roll so that a straight line passing through the midpoint between the center of the eccentric metal and the center of the roll support shaft and passing through the center of the circular grinding stone passes through the center of the circular grindstone. The method of polishing a backup roll according to claim 1, wherein polishing is performed in a state where the end portion of the eccentricity adjusting lever is fixed in position. 3. The method of polishing a backup roll according to claim 2, wherein a fixed lever similar to the eccentricity adjustment lever is attached to the central split roll and the end portion is fixed. 4. An odd number of split rolls (4a) or (5) of 3 or more.
a, 5a ') is a backup roll which is rotatably attached to the roll support shaft (4b) or (5b) at a predetermined interval.
With the roll surface (4a) or (5a) attached to the roll surface and the edge of each split roll (4a) or (5a, 5a '), all split rolls (4a) or (5a, 5a') A device for polishing to have a uniform diameter, the polishing bed of the polishing device (7)
A backup roll polishing rack (12) on which the roll support shaft (4b) or (5b), which is fixedly mounted on and fixed to the split roll (4a) or (5a, 5a '), is mounted, and the backup roll. The roll support shaft (4b) or (5b) on the whetstone mounting carriage (10a) that reciprocates in parallel with the roll support shaft (4b) or (5b) mounted on the polishing base (12) A circular whetstone that has a whetstone mount (10b) installed so that it can move in a substantially horizontal plane at right angles and that rotates along a plane perpendicular to the roll support shaft (4b) or (5b).
(10c) is composed of a grindstone driving device (10) mounted on the grindstone mounting base (10b), and the backup roll polishing rack (12) is the following member, roll support shaft (4b) or (5b ) A semicircular recess (13a) in which both ends are fitted and supported horizontally, the horizontal roll support shaft (4b) or (b) with its opening surface directed obliquely upward toward the circular grindstone (10c) side. Circular grinding wheel (10c) in a cross section perpendicular to 5b)
(O ₄ ) and the roll support shaft (4b) or the center (O ₂ ) of the roll support shaft (5b) connecting the end of the roll support shaft inclined by about 45 degrees with respect to the reference polishing load line (L ₃ ). The portion (13), the roll support shaft (4b) or (5b) is provided for each of the divided rolls in order to hold the divided rolls and to maintain the distance between the divided rolls, and the roll support shaft (4b) or (5b)
Between the roll support shaft gripping arm (14) and the roll support shaft (4b) or (5b) is removable.
(13) and the split roll of the backup roll (4) or (5) in the polishing position supported by the inter-roll shaft gripping arm (14)
(4a) or (5a, 5a ') is slightly rounder than the radius end (Q ₁ ) perpendicular to the reference grinding load line (L ₃ ) in a section perpendicular to the roll support shaft (4b) or (5b) Rotatable and pressure contact for supporting the roll surface on the grindstone (10c) side from below by pressure contact,
The supporting idle roll (16) provided separately for each of the divided rolls and the backup roll (4) or (5) at the polishing position are perpendicular to the reference polishing load line (L ₃ ) in the vertical section above. To rotate the surface by pressing the roll surface on the side of the circular grindstone (10c) slightly from the radius end (Q ₂ ) and pressing it from above.
A divided roll driving means consisting of a driving roll (22) that is press-contacted and separated and is provided for each divided roll (4a) or (5a, 5a '), and an electric motor (25) for the driving roll (22), The circular grindstone (10c) is provided with a parallel surface (10ca) parallel to the grindstone rotation axis and tapered portions (10cb) on both sides thereof on the peripheral surface of the circular grindstone (10c), and the width of the parallel surface (10ca) ( L ₁ ) is any split roll interval
Even if the circular grindstone (10c) is pressed between the split rolls having a taper portion (10cb) smaller than (L ₂ ) and the widest split roll interval (L ₂ ), the split rolls (4a) or (5a, 5a) A polishing device for a backup roll, which has a width sufficient to abut the entire surface of the taper portion (5ad) of the edge of (1). 5. A plurality of layers in which each split roll (5a) except the central split roll (5a ') in a state of being fitted into the roll support shaft (5b) includes an eccentric metal (5aa) having an eccentric wall thickness cylindrical shape. The eccentric metal (5aa) has an eccentricity adjusting lever (5c, 5c ') attached to the side surface of the eccentric metal (5aa), and the protruding amount of the split roll surface is adjusted by the rotational position around the roll center line. Each eccentricity-adjustable split roll of the backup roll (5) mounted on the backup roll polishing table (12) so that it can be used even when the eccentricity-adjustable split roll (5a) is used.
(5a) Center (O ₁ ) of the eccentric metal (5aa) and roll support shaft
A straight line (O ₁ O ₂ ) passing through the middle point (O ₃ ) between the center (O ₂ ) of (5b)
Of the eccentricity adjusting lever (5c, 5c ') so that a straight line (L ₅ ) perpendicular to the center passes through the center (O ₄ ) of the circular grindstone (10c), the eccentricity adjusting lever (5c, 5c) The locking part (27, 28) for locking the tip of the ') is further provided on the backup roll polishing rack (12) for all the split rolls (5a) except the central split roll (5a'). Item 5. A backup roll polishing apparatus according to Item 4. 6. The backup roll polishing rack (12) has a locking portion for locking the tip of a fixed lever (5c ″) similar to the eccentricity adjusting lever (5c) attached to the central split roll (5a ′). The backup roll polishing apparatus according to claim 5, which is further provided. 7. A roll end holding rotary table (8) and a roll end support moving table (9) for polishing a straight roll (6) are installed with the backup roll polishing table (12) interposed therebetween. The backup roll polishing stand according to any one of claims 4 to 6, wherein the backup roll polishing base (12) can be attached to and removed from the polishing bed (7) so as to be used for polishing a straight roll (6). Polishing equipment. 8. The unevenness corresponding to the predetermined shape of the peripheral surface of the circular whetstone (10c) on the extension of the backup roll (4) or (5) when mounted on the backup roll polishing base (12). 8. The backup roll polishing apparatus according to claim 4, further comprising a diamond dresser (11) having an inverted shape.