JPH0745049B2 - Rolling mill bearing box - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a bearing box of a rolling mill, and more particularly, in a rolling mill equipped with a roll bending device, the diameter of the bearing box is increased by grinding. The present invention relates to a bearing box of a rolling mill suitable for supporting a rolling roll that changes in a wide range from a small diameter to a small diameter.

[Conventional technology]

In recent rolling mills, it is common to equip both the increment bending and decrease venting cylinder units to control the shape of the rolled material. The cylinder unit preferably has a large capacity so that a sufficient bending force can be applied to the roll. Also, since the roll diameter gradually decreases due to wear and grinding, the stroke of the cylinder unit is
It must be able to follow changes in roll diameter. For these reasons, recent cylinder units have inevitably become large in size, and it has become difficult to set the cylinder unit in the project block or the guide block. Especially for small-diameter rolls, it is not possible to install a cylinder unit because the space around it is small, and even for large-diameter rolls, it is impossible to increase the stroke of the cylinder unit as the roll diameter decreases. It is said.

Therefore, there is also one in which each of the increment bending and decrease bending cylinder units is arranged in series in the roll axis direction to widen the space around the bearing box. However, in this case, the point of action of the bending force and the center position of the bearing are different, and an unbalanced load is applied to the bearing, which causes a problem that a sufficient bending force cannot be applied.

Also, when the roll diameter decreases and the stroke of the cylinder unit becomes insufficient, auxiliary rollers are arranged in front of and behind the rolling rolls, and the path line through which the rolled material is conveyed is moved up and down by the auxiliary rollers to reduce the stroke shortage. There are also things that I tried to supplement. However, in this case, when the rolled material comes into contact with the auxiliary roller, the surface thereof is likely to be scratched or soiled, which is a quality problem.

On the other hand, due to the progress of roll manufacturing technology,
A high-depth roll has been developed that has extremely low hardness reduction even after grinding to 20 to 30 mm, and the roll body whose hardness has decreased due to wear is re-quenched and heat treated so that it can be used again as a high-hardness body. Technology was also established. For this reason, for example, for rolls with an outer diameter of 500 mm, those that were conventionally discarded if the outer peripheral surface was ground by 30 to 40 mm,
Nowadays, it is used more than twice as much as 70-90mm. As described above, when one roll is used until it has a small diameter, it has become difficult to support it with one type of bearing box.

For this reason, two types of bearing boxes, one for large diameter and one for small diameter, have been prepared for one roll, but it has been very troublesome to replace them. In particular, in a tandem mill, a high-pressure roll is required in the first-stage mill, so that a small-diameter roll is provided, and a second-stage mill tends to be provided with a large-diameter roll in order to improve the surface quality. Different types of bearing boxes were prepared, which was also a cause of high costs.

In order to solve the problems described above, the following publicly known examples have been proposed. That is, a support member that is integrally formed on the side surface of the bearing box and that protrudes in the pass direction is provided at a position offset from the center line, and when the roll diameter changes, the bearing box is rotated 180 degrees and two types of rolls are used. (For example, Japanese Patent Laid-Open No. 60-76209) and the support member is separated from the bearing box, and when mounting, various spacers having different heights are provided between the support member and the bearing box. There is one (for example, JP-A-55-16728) in which the spacer is interposed and the vertical position of the support member is adjusted by this spacer.

[Problems to be solved by the invention]

However, in the case of reversing the bearing box by 180 degrees, the support is limited only to two types of roll diameters, a large diameter and a small diameter, and cannot be applied to an intermediate roll diameter. It is impossible to support a roll whose diameter is gradually reduced by grinding.

Further, in the case of interposing a spacer, the position of the supporting member can be changed only within the range of the thickness of the spacer, and it is difficult to support a roll that varies widely from a large diameter to a small diameter by being ground. It was

An object of the present invention is to provide a rolling bearing bearing box that can support a roll whose diameter is greatly changed from a large diameter to a small diameter by grinding in the same bearing box without converting the bearing box. It is to be.

[Means for solving problems]

In order to achieve the above-mentioned object, one of the present invention is to support both ends of a rolling roll, and to vertically slide a bearing box body along a project block provided in a housing, and the bearing. A first support member which is provided so as to project on both side surfaces in the path direction of the box body, and the projecting tip portion engages with the project block to selectively set the vertical position of the bearing box body. It was done. In addition, the other is the bearing box body and the first
Instead of the support member, a second support member that continuously sets the vertical position of the bearing box body is provided.

[Action]

The vertical position of the bearing box is determined by the size of the roll diameter. It is determined. Therefore, when the roll diameter is greatly reduced by grinding, the bearing box must be moved along the vertical direction so as to approach the pass line. However, since the bearing box is engaged with the project block or the guide block, the bearing box cannot be moved vertically in this state.

Therefore, with the above configuration, when the tip end portion of the first support member is engaged with the project block or the guide block, the bearing box body is vertically moved according to the position of the tip end portion with respect to the first support member. It can be moved selectively and can respond to changes in roll diameter. In addition, if many kinds of first support members with different positions of the tip end portion are prepared,
It is possible to move the bearing box body with a fine pitch. If the second support member is provided instead of the first support member, the bearing box body can be continuously moved in the vertical direction.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a cross section of a main part of a rolling mill to which a roll bearing box according to the present invention is applied. In the figure, a pair of project blocks 3 are fixedly attached to the window inner frame 2 of the roll housing 1, and a reinforcing roll balance cylinder 4 is provided on the upper part of the project blocks 3. An upper reinforcing roll 5 is arranged above the project block 3, and the upper reinforcing roll 5 is supported by a reinforcing roll balance cylinder 4 via an upper reinforcing roll bearing box 6. A lower reinforcing roll 7 is arranged below the project block 3, and the lower reinforcing roll 7 is supported by a lowering jack (not shown) via a lower reinforcing roll bearing box 8. A pair of work rolls 10 and 11 for rolling the rolled material on the pass line 9 are arranged between the upper and lower reinforcing rolls 5 and 7, and these upper and lower work rolls 10 and 11 are respectively upper and lower work rolls. It is supported by bearing boxes 12 and 13. Up·
The lower work roll bearing boxes 12 and 13 are slidable inside the project block 3 in the vertical direction (vertical direction on the paper surface) and the roll axial direction (vertical direction on the paper surface). Grooves 12A and 13A are formed in parallel with. L-shaped support members 14 and 15 are fitted in the groove portions 12A and 13A, and the support members 14 and 15 are detachably fixed by a plurality of bolts 16 as shown in FIG. There is. Further, the project block 3 is formed with concave portions 3A, 3B, and the tip end portions 14A, 15A of the supporting members 14, 15 are inserted into the concave portions 3A, 3B. The project block 3 has the recesses 3A and 3B sandwiched therebetween, and the increment cylinders 17 and 18 and the decrease cylinders 19 and 20 are arranged at the upper and lower positions thereof.
Are arranged to apply bending force to the upper and lower work roll bearing boxes 12 and 13 via the support members 14 and 15. 17A and 18A are increment piston rods provided in the increment cylinders 17 and 18, respectively.
A is a decrease piston rod provided in the decrease cylinders 19 and 20, respectively. Increase piston rods 17A and 18A and decrease piston rod 1
The stroke of 9A and 20A is about ± 25mm.

By the way, in FIG. 1, the left side of the mill center line a shows the case where the upper and lower work rolls 10 and 11 have a relatively large diameter, and the right side shows the case where the upper and lower work rolls 10 and 11 have a relatively small diameter. .
In the former case, the support members 14 and 15 are arranged so that the respective tip portions 14A and 15A are close to each other.
Bending force is received at a position relatively close to the pass line 9 with respect to the shaft centers 12C and 13C of the lower work roll bearing boxes 12 and 13. This is shown only in the upper work roll bearing box 12 side as shown in FIG. On the other hand, in the latter case, the support members 14 and 15 are mounted upside down, and the respective tip portions 14A and 15A are arranged so as to be far from each other, and the shaft centers of the upper and lower work roll bearing boxes 12 and 13 are arranged. 12
The bending force is received at a position relatively distant from the pass line 9 with respect to C and 13C. This is shown only in the upper work roll bearing box 12 side as shown in FIG. In FIGS. 2 and 3, reference numeral 21 is a sliding liner provided on both side surfaces of the upper work roll bearing box 12.

Next, in the case where the diameter of the work roll is an intermediate size between the large diameter and the small diameter, only the side of the upper work roll bearing box 12 will be described. Regarding the lower work roll bearing box 13, the upper work roll bearing box with respect to the pass line 9
It is symmetrical with the 12 side. When the upper work roll 10 has an intermediate diameter between the large diameter and the small diameter, a T-shaped support member 23 is fitted in the groove 12A of the upper work roll bearing box 12 as shown in FIGS. 5 and 6. The center line of the tip portion 23A of the support member 23 passes through the shaft center 12C of the upper work roll bearing box 12. Then, a bending force is applied to the upper work roll 10 via the support member 23.

Further, when the work roll 10 has an arbitrary diameter between the large diameter and the small diameter, as shown in FIG. 7, the support member 24 provided with the tip end portion 24A eccentric is fitted to the upper work roll bearing box 12. I am combining. And the tip part 24A and the upper work roll bearing box 1
By changing the relative position of the second shaft center 12C, it becomes possible to cope with any roll diameter.

The support members 14, 15, 23, 24 form each first support member.

Here, the relationship between the L-shaped or T-shaped support member and the diameter of the work roll described above will be specifically described. For example,
For the L-shaped support member 14, from the pass line 9 to the support member
The distance to the center line of the tip portion 14A of 14 is H. On the other hand, from the pass line 9 to the shaft center 12 of the upper work roll bearing box 12
Regardless of the distance H, the distance to C is the upper work roll 1
It is 1/2 of the diameter D of 0. Therefore, if the vertical distance between the tip portion 14A of the support member 14 and the shaft center 12C of the upper work roll bearing box 12 is h, the relational expression of D = 2 (H ± h) is established. Since H is a fixed dimension, D can be uniquely determined by changing h. The symbol "+" or "-" in front of h means that the mounting direction of the support member 14 can be converted up and down. The above relational expression holds even if the T-shaped support member 23 or 24 is attached instead of the L-shaped support member 14.

Assuming that the L-shaped support member 14 is used, H is 200 mm and h is 5
If it is 0 mm, the maximum roll diameter of the upper work roll 10 is D =
From 2 x (200 + 50) to 500 mm, the minimum roll diameter is D
= 2 x (200-50) gives 300 mm. When the diameter of the upper work roll 10 is intermediate between the large diameter and the small diameter, a T-shaped support member 23 is used instead of the L-shaped support member 14,
When the center line of the tip portion 23A of the support member 23 passes through the shaft center 12C of the upper work roll bearing box 12, the upper work roll 10
The diameter is 400 mm from D = 2 × (200 ± 0). Further, when the diameter of the upper work roll 10 is an arbitrary size between the large diameter and the small diameter, a T-shaped support member 24 is used, for example, h
= 25 mm, the diameter of the upper work roll 10 is D = 2 x (200
From ± 25) it becomes 450mm and 350mm. Therefore, if there are three kinds of support members that make h size 50mm, 25mm, 0mm,
It will be possible to support work rolls prepared with 50 mm pitches with diameters from 500 mm to 300. This means that if the cylinder unit is capable of changing the stroke up to 50 mm, the roll can be supported even if the diameter changes by 200 mm.

Next, another embodiment of the present invention will be described.

In the above-described embodiment, the L-shaped or T-shaped supporting member is separately provided, but this supporting member is provided on both side surfaces of the work roll bearing box 12 (or 13) as shown in FIG. It is also possible to configure with the guide slide liner 30. In this case, the leading end portion 30A is integrally formed with the guide sliding liner 30.

Similarly, FIG. 9 shows an example in which the guide sliding liner is used as a supporting member. In the figure, the lower work roll bearing box
A guide sliding liner 31 is provided on both side surfaces of 13, a tip portion 31A is formed on an upper portion of the guide sliding liner 31, and a wheel 32 necessary for roll recombination is provided on a lower portion. Also in this case, the distance H from the pulse line 9 to the lower surface of the tip portion 31A is a fixed dimension. The distance R from the pass line 9 to the lower side of the wheel 32 is also constant. Then, by replacing the guide sliding liner 31 so that the distance h between the lower surface of the tip portion 31A and the shaft center 13C of the lower work roll bearing box 13 changes, the lower work roll 11 with a large diameter to a small diameter can be handled. It will be possible.

Further, FIGS. 10 and 11 show still another embodiment. A circular hole 35 is formed in the center of both side surfaces of the upper work roll bearing box 12 (or the lower work roll bearing box 13). Two circular holes 35 are formed above and below the hole 35 along the roll shaft.
A liner 36 is attached. These liners 36
A rotation support member 37 including a prismatic tip member 37A and a shaft portion 37B fitted in the hole portion 35 is provided between them. The size of the tip portion 37A of the rotation support member 37 is shorter than the length of the liner 36 in the roll axis direction and protrudes from the sliding surface of the liner 36 in the pass direction. The projecting portion receives a bending force from a piston rod (not shown) of a bending cylinder. When the bending force is applied, the shaft of the upper work roll 10 (or the lower work roll 11) is bent, and both ends thereof are slightly inclined, but since the rotation support member 37 is rotatable around the shaft portion 37B, The part 37A can be kept horizontal and prevents the piston rod and the tip part 37A from being partially contacted. Further, the rotation support member 37 is a tip portion.
The 37A and the shaft portion 37B are eccentric by the eccentric amount δ, and can be fitted with the upper work roll bearing box 12 (or the lower work roll bearing box 13) upside down. Therefore, if multiple types of rotation support members 37 having different eccentricities δ are prepared, the upper work roll 10 (or the lower work roll from a large diameter to a small diameter) can be prepared.
11) can be supported.

The case where the present invention is applied to an intermediate roll bearing box of a six-high rolling mill is shown in FIGS. 12 and 13. In FIG. 12, a groove 41A is formed in the roll axial direction on the side surface of the intermediate roll bearing box 41 that supports the intermediate roll 40.
An L-shaped support member 42 is fitted inside. L-shaped support member 42
Are removably fixed to the intermediate roll bearing box 41 with bolts or the like. The tip end portion 42A of the L-shaped support member 42 is fitted into the groove portion 43A formed in the guide block 43, and the guide block 43 is further recessed in the project block 44.
It is fitted inside A. Further, since the position of the guide block 43 is fixed, the L-shaped support member from the pass line 9
Although the distance to the tip end portion 42A of 42 is a fixed dimension, if the L-shaped support member 42 is replaced with another L-shaped support member 45 as shown in FIG. 13, for example, the intermediate roll bearing box 41 will be in the vertical direction. Can be moved to. As a result, one type of intermediate roll bearing box 41 has a small diameter work roll 46 shown in FIG.
It becomes possible to correspond to the work roll 47 having a relatively large diameter shown in the figure.

FIG. 14 shows a case where the work roll bearing box is supported by a guide block containing a bending cylinder. In the figure, the support member 50 is fitted in the groove portion 12B formed in the upper work roll bearing box 12, and the tip end portion 50A of the support member 50 is fitted in the groove portion 51A formed in the guide block 51, thereby forming the work roll bearing. The box 12 and the guide block 51 are connected via a support member 50. The support member 50 has both groove portions 12
It is slidable on the B and 51A in the roll axis direction, and if the support member 50 is replaced with another support member 52, the central axis 10C of the work roll 10 can be changed. However, the other support member 52 has a shape different from that of the support member 50.

15 and 16 show the upper work roll bearing box 12 and the guide block 53 which are connected by a rotatable supporting member 54 in the embodiment of FIG. 14 described above.

In addition, FIGS. 17 and 18 show that the support member can be adjusted in the vertical direction so as to save the trouble of exchanging it. In FIG. 17, recesses 12C are formed on both side surfaces of the work roll bearing box 12, and a support member 55 is arranged in the recess 12C, and the support member 55 is pivotally supported on the work roll bearing box 12. It is screwed together with Sukuryu 56. That is, by rotating the screw 56, the support member 55 can be moved in the vertical direction, and the work roll bearing box 12 can support the work rolls 10 having a large diameter to a small diameter.
The support member 55 constitutes a second support member.

In addition, FIG. 18 shows a screen of the embodiment of FIG.
Instead of, use wedges 57,58 and adjusting liner 59
The position of the support member 60 is adjusted. The support member 60 constitutes a second support member.

According to the embodiment shown in FIGS. 17 and 18, the position of the work roll bearing box 12 can be adjusted steplessly.

〔The invention's effect〕

As described above, according to the present invention, when a large number of types of first support members having different positions of the tip portion are prepared, when the tip portion is engaged with the project block or the guide block, the bearing box main body is It can be moved vertically with a fine pitch, and one type of bearing box can handle changes in the roll diameter due to grinding. Also,
If the second support member is provided instead of the first support member, the bearing box body can be continuously moved, and the bearing box body can be set at an optimum position for the current roll diameter. is there.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of a rolling mill to which the bearing box according to the present invention is applied, FIGS. 2 and 3 are detailed sectional views showing the mounting state of the supporting member in FIG. 1, and FIG. FIG. 5 is a detailed cross-sectional view showing a mounting example of the member, FIG. 5 is a partial view corresponding to FIG. 1 in which a T-shaped supporting member is used, and FIGS. 6 and 7 are mounting states of the supporting member in FIG. FIG. 8 and FIG. 9 are detailed cross-sectional views showing a case where a support member is formed on the guide sliding liner, FIG. 10 is a front view showing the mounting state of the rotation support member, and FIG. Sectional view taken along the line XI-XI of FIG. 10, FIGS. 12 and 13 are sectional views of a main part of a rolling mill in which the present invention is applied to an intermediate roll bearing box, and FIG. 14 is a supporting member as a guide block. FIG. 15 is a sectional view showing a case where it is applied, FIG. 15 is a front view showing a case where a rotation support member is applied to a guide block, and FIG.
A cross-sectional view taken along the line XVI-XVI in the drawing, and FIGS. 17 and 18 are cross-sectional views showing an example in which the position of the support member is adjustable. 1 ... Housing, 3 ... Project block, 5, 7 ... Upper / lower reinforcing rolls, 6, 8 ... Upper / lower reinforcing roll bearing box, 9 ...
Pass line, 10,11… Upper and lower work rolls, 12,13… Upper and lower work rolls Bearing box, 14,15,23,24… Supporting member, 17,18… Increas bending cylinder, 19,20… Decrees bending cylinder.

Claims (8)

[Claims] 1. Supporting both ends of a rolling roll,
A bearing box main body that is slidable in the vertical direction along a project block provided in the housing, and projectingly provided on both side surfaces of the bearing box main body in the path direction, and the projecting tip portion engages with the project block. And a first support member for selectively setting the vertical position of the bearing box body, the bearing box of the rolling mill. 2. The bearing box of a rolling mill according to claim 1, wherein the first support member is detachably attached to a side surface of the bearing box body. 3. The rolling machine according to claim 1, wherein the first supporting member is integrally formed with a guide sliding liner provided on a side surface of the bearing box main body. Bearing box. 4. The bearing box of the rolling mill according to claim 1, wherein the first support member has a central portion rotatably coupled to a side surface of the bearing box body. 5. A tip end portion of the first support member is connected to a guide block having a bending cylinder provided in the project block, which is incorporated in the project block. A bearing box for a rolling mill according to any one of items. 6. Supporting both ends of the rolling roll,
A bearing box main body that is slidable in the vertical direction along a project block provided in the housing, and projectingly provided on both side surfaces of the bearing box main body in the path direction, and the projecting tip portion engages with the project block. And a first support member for continuously setting the vertical position of the bearing box body, the bearing box of the rolling mill. 7. The bearing of a rolling mill according to claim 6, wherein the second support member is screwed with a rotatable screw provided on a side surface of the bearing box main body. box. 8. The rolling mill according to claim 6, wherein the second supporting member is provided with wedges on its upper surface and lower surface that slide in the axial direction of the rolling roll. Bearing box.