JPH01104404A - Repairing method for roll of rolling mill and roll cutting device - Google Patents

Abstract

PURPOSE:To repair the groove of a roll with a roll fitted to a housing by fixing the roll stand removed from a rolling mill and cutting the roll in the state of its approaching to the housing in the axial line direction. CONSTITUTION:The roll stand 2 removed from a rolling mill is mounted on the base 33 of a cutting device 31. A roll 5 is made in the same height as that of a cutter 90 by a lift device. The housing 4 of the roll stand 2 is pushed by extending pushers 60, 61 and 62, 63 and fixed by locating it in the specified positional relation to the base frame 32 of the cutting device 31. The roll 5 is then pressed in the axial line direction by extending a cylinder to perform the positioning of the roll 5 for the housing 4. The cutter 90 is moved in the axial line and radial directions of the roll 5 in the state of rotating the roll 5 to cut the specified shaped groove. The displacement of the roll 5 under cutting can be prevented. After cutting the fixture of the housing 4 is released and it is fitted to an original rolling mill.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for repairing worn rolls of a rolling mill and an apparatus for cutting the rolls for repair.

[Conventional technology]

The rolling mill includes a roll stand attached to a base frame and a drive device for driving the rolls.

The roll stand has a housing and a pair of rolls rotatably attached to the housing via roll bearings. Grooves are formed in each of the pair of rolls to form a rolling caliber.

Such a roll stand has a housing fixed to a predetermined position on the base frame. The roll is biased toward the housing in its axial direction, so that the roll is accurately positioned with respect to the housing. As a result, the caliber is located exactly in the line through which the rolled material passes in the rolling mill.

Rolling of the material is performed by rotating the roll by the drive device and passing the material transported along the line through the caliber.

[Problem to be solved by the invention]

When the grooves of the rolls are worn, it becomes difficult to roll the material into a predetermined shape.

Therefore, the applicant's company regularly repairs the grooves.

The above repair work is being carried out as follows. That is, first, the roll stand 2e as shown in FIG. 13(A) is removed from the rolling mill, and then the roll 5e as shown in FIG. 13(B) is removed from the housing 4e of the roll stand 2e. Note that the roll bearing 6e and the joint 17a for the drive device are still attached to the roll 5e as shown in the figure.Next, the joint 17e and the roll bearing 6e are removed from the roll 5e, and the roll 5e is removed as shown in FIG. 13(C). Next, the roll 5e is mounted on the lathe 31e as shown in FIG. The roll stand 2e as shown in FIG. 13(A) is assembled again. In this assembly, the roll 5e must be correctly positioned with respect to the housing 4e due to the above-mentioned circumstances. Therefore, the assembly operation requires extreme care. The roll stand 2e assembled in this way is mounted on a rolling mill.

However, the above-mentioned repair work requires an extremely large number of man-hours, which not only increases the labor cost of the workers, but also causes the problem that the repair takes a long time.

The present invention has been made in view of the above points, and its purpose is to be able to repair the grooves of worn rolls with less man-hours, and in that case, to repair the grooves of worn rolls by attaching the rolls to the housing. It is an object of the present invention to provide a method for repairing a roll of a rolling mill and a roll cutting device that allow cutting in the same state.

[Means to solve problems]

In order to achieve the above object, the present invention takes the measures as described in the claims above, and its effects are as follows.

[Effect]

When repairing rolling rolls in a rolling mill, first remove the roll stand from the rolling mill.

Next, the removed roll stand is fixed, and the roll is moved in the axial direction of the housing in the roll stand. In this state, the roll is cut. After cutting is completed, the roll stand is unfixed (the roll stand is then attached to the rolling mill).

The cutting device used for cutting rolls has a base frame and a stand provided on the base frame for mounting a roll stand.
The housing of the roll stand placed on the stand is fixed to the base frame by fixing means.

Furthermore, the rolls of the roll stand are positioned in the axial direction by a roll positioning means. The roll is rotated by a roll rotation drive device while positioned relative to the housing, and is cut by a cutting tool.

〔Example〕

The drawings showing the embodiments of the present application will be described below.

FIG. 1 shows a commonly known rolling mill 1, which has a roll stand 2 and a drive 3. FIG. As shown in FIG. 2.3, the roll stand 2 includes a housing 4 and a pair of rolls 5.5 rotatably mounted on the housing 4 by roll bearings 6.6, the housing 4 being rolled. An opening 7 is formed for inserting the material to be made, and leg members 8 are attached to the lower surface for stably placing the object on another object. The housing 4 is also provided with machining reference seats 9a+9b, 10a, and lOb. These reference seats are made of sturdy metal seat plates 11°1 fixed in recesses in the housing, as shown in detail in Figures 9-11.
It is composed of 2 and 13 surfaces. A groove 15.15 is formed in each of the pair of rolls 5.5.

The mutually opposing grooves 15.15 of each roll constitute a caliber 16, respectively. Each roll may have one groove 15, respectively. At one end of each of the rolls 5.5, a coupling 17 for a drive device is attached. As shown in FIG. 1, the roll stand 2 described above is detachably attached to a trolley 19 installed on a base frame 19a so as to be movable in the direction of the arrow by means of a clamping means not shown. ing. A shift device 20 is connected to the truck 19 to shift it in the direction of the arrow.

In the case of a rolling mill in which the roll 5 has only one groove 15, the cart 19 and the shift device 20 are not necessary.

The drive device 3 has an electric motor 21, a pinion stand 22, and a pair of roll drive shafts 23,23.

The input shaft 22a of the pinion stand 22 is connected to the rotating shaft 21a of the motor 21 through a joint 24, and a pair of output shafts 22b
.

22b is a roll drive shaft 23.23 and an expansion joint 25.25
It is connected by . The roll drive shaft 23 is supported by a bearing body 26, and a joint 27 for the roll stand is provided at the tip.
is installed. The bearing body 26 is attached to a slide table 28 so as to be movable in the direction of the arrow.

A fluid cylinder 29 is attached to the table 28,
The piston rod is connected to a bearing body 26.

The slide table 28 is mounted on a pedestal 30 so as to be freely movable in the direction of the arrow. This table 28 is connected to the shift device 20.

The operation of the rolling mill 1 described above is as follows. As the cylinder 29 expands, the bearing body 26 moves forward toward the roll stand 2, and the joint 27 joins with the joint 17. In this case, the extension force of the cylinder 29 urges the roll 5 against the housing 4 in its axial direction. As a result, the roll 5 is brought closer to the housing 4 in its axial direction. the result,
The axial wobbling of the roll 5 with respect to the hanging 4 is eliminated.

That is, the roll 5 is positioned with respect to the housing 4. By means of the shifting device 20, the roll stand 2 is shifted in the direction of its roll axis. As a result, multiple Caliber 1
6 is located in the passing line of the rolled material. When the motor 21 operates in this state, its rotational force is transmitted to the roll 5 via the pinion stand 22 and the roll drive shaft 23, causing the roll 5 to rotate. In this rotating state, the rolling material is passed through the caliber 16 and rolled.

The above rolling is repeated, and the groove 1 of the roll 5 is
5 becomes worn, it will need to be repaired.

4 to 11 show a roll cutting device 31 used for the repair.

The roll cutting device 31 has a base frame 32 . The base frame 3
2 includes a stand 33 on which the roll stand 2 is placed;
Housing positioning means 35 for positioning the housing 4 of the roll stand 2 with respect to the base frame 32; fixing means 36 for fixing the housing 4; A roll positioning means 37 for positioning the roll 5, a driving means 38 for rotationally driving the roll 5, and a cutting tool 90 for cutting the roll.
An operating mechanism 39 for operating the table 33, a lifting device 40 for lifting and lowering the table 33, etc. are attached.

The base frame 32 includes a machine base 42 having an opening 43, an upper frame 44 attached to the upper side of the machine base 42, and rising frames 45a to 45a.
45c, a mounting base 46 for the drive device, a mounting base 47 for the tool operating mechanism, etc., and a lower frame 48 etc. attached to the lower side of the machine base 42.

As shown in FIG. 4, the upper frame 44 has a reference body 50, 51 for positioning the housing 4 of the roll stand 2.
are arranged horizontally apart from each other. As shown in FIG. 7, there are two reference bodies 50, one above the other.

The same applies to the reference body 51. The details of each reference body 50, 51 are shown in FIGS. 9 and 10, respectively. As shown in FIG. 9, the reference body 50 is constructed by attaching a catch 53 to the tip of a base material 52 fixed to the upper frame 44. The catch 53 has two receiving parts 53a that intersect at right angles to each other; 53b. The reference body 51 has a catch 5 at the tip of the base material 54 as shown in FIG.
5 is installed and configured. Further, as shown in FIG. 4, the rising frame 45a is provided with a reference body 56. This reference body 56 also has two, upper and lower. This reference body 56
The details are shown in FIG. The reference body 56 is constructed by attaching a seat 58 to the tip of a base material 57 fixed to the upright frame 45a. These reference bodies 50, 51, 56 constitute the positioning means 35. The receiving portion 53a and the receiving seat 55
By receiving the reference seats 9a and 9b in the housing 4, the housing 4 is positioned horizontally and in a direction perpendicular to the axis of the roll 5.

Further, the receiving portion 53b and the receiving seat 58 are the reference seats IQa and 10b.
By receiving these, the housing 4 is positioned horizontally and in the axial direction of the roll 5. As shown in FIG. 6.7, guide rails 59 are provided on the upper frame 44 between the upper and lower reference bodies and at positions above the upper reference body.
is installed.

As shown in FIGS. 4.6 and 7, the upright frames 45a and 4
5b, pushers 6 for pushing the housing 4 horizontally and in a direction perpendicular to the axis of the roll 5.
0.61 is installed. Pushers 62 and 63 for pushing the housing 4 in the horizontal direction and in the axial direction of the roll 5 are attached to the upright frames 45b and 45C, respectively. These bushings 60 to 63 and the reference body 50.
51 and 56 constitute the housing fixing means 36.

As shown in FIGS. 4 and 7, the upper frame 44 is equipped with a radial preload mechanism 65. The mechanism 65 includes a fluid cylinder 6G attached to the upper frame 44 and a fluid cylinder 66.
It consists of a pusher body 67 attached to the piston rond. The pushing body 67 has a plurality of rollers 68 for pressing against the circumferential surface of the roll 5.
is provided in the front so that it can rotate freely. The positions of these rollers 68 are set so that they come into pressure contact with both edges of the groove 15 on the roll 5.

As shown in FIG. 6, a bearing body 71 is attached to a linear rail 70 fixed to a mounting base 46 in a direction parallel to the axial direction of the roll 5 so as to be movable along the rail. The fluid cylinder 72 attached to the mounting base 46 has its piston rod connected to the bearing body 71, and moves the bearing body 71 along the rail 70. The bearing body 71 rotatably supports a roll drive shaft 73 having a joint 74 at its tip for joining with the joint 17 of the roll 5. An electric motor 75 and a speed reducer 76 connected to its rotating shaft via a belt 77 are attached to the mount 46 . *The rotational output shaft 76a of the continuous shooting 76 and the roll drive shaft 73 are connected by an expansion joint 78.

When the cylinder 72 is extended, the roll drive shaft 73 moves toward the roll stand 2 and the joint 74 is coupled to the joint 17 of the roll 5. Furthermore, the extension force of the cylinder 72 is
The roll 5 is pushed in the axial direction of the housing 4 through the roll drive shaft 73, and as a result, the roll 5 is brought closer to the housing 4 in the axial direction, and the wobbling of the roll 5 with respect to the housing 4 is eliminated. That is, the roll 5 is positioned relative to the housing 4. The cylinder 72 and bearing body 71 have such an effect. The roll drive shaft 73 and the like constitute the roll positioning means 37.

When the motor 75 operates, its rotational force is transferred to the belt 77.
, the reduction gear 76, the joint 78, the roll drive shaft 73, etc., and are transmitted to the roll 5, causing the roll 5 to rotate.

These members constitute the roll rotation drive means 38.

As shown in FIGS. 4 and 7, the roll 5 is mounted on the mounting base 47.
A linear rail 80 fixed in a direction parallel to the axial direction of
A carriage 81 is attached to the carriage 81 so as to be movable along the rail. This carriage 81 is moved along the rail 80 by a feeding device ff82. The feeding device 82 is attached to the mounting base 47
The screw shaft 83 has a screw shaft 83 mounted parallel to the rail, and an electric motor 84 for rotating the screw shaft 83.
3 is screwed with a female screw body attached to the carriage 81. When the screw shaft 83 is rotated by the motor 84, the carriage 81 moves along the rail 80. Another linear rail 85 is attached to the carriage 81 in a direction perpendicular to the linear rail 80. Another carriage 86 is attached to the linear rail 85 so as to be movable along the rail 85. This carriage 86 is moved along the rail 85 by a feeding device 87 which is constructed identically to the feeding device 82 described above by means of a screw shaft 88 and an electric motor 89. A cutting tool 90, such as a cutting tool, for cutting the roll 5 is detachably attached to the carriage 86. A roll position detection device 91 is also attached to the carriage 86. The mounting W,
91 has a detection rod 92 which is provided on a carriage 86 and can freely move forward and backward in a direction parallel to the linear rail 85.

The detection rod 92 is moved forward and backward by a cylinder 93. A potentiometer is connected to the detection rod 92.

The potentiometer outputs the amount of advancement of the detection rod 92 until the tip of the detection rod 92 contacts the portion of the roll 5 to be cut in the form of an electric signal.

As shown in FIGS. 6 and 7, the stand 33 is connected to the machine stand 4.
It is attached to an elevating frame 96 such that vertical movement with respect to the machine base 42 is guided by guide rollers 95, and it can be moved up and down through the opening 43 of the machine base 42. The lifting device 40 includes an electric motor 97 and a speed reducer 98 attached to the lower frame 48.
and a ball screw mechanism 101.

A male screw, that is, a screw shaft 99 in the ball screw mechanism 101 is connected to an output shaft of a speed reducer 98. Further, the female threaded body 100 of the ball screw mechanism 101, that is, the female threaded body 100 which is screwed onto the screw shaft 99, is attached to the lifting frame 96. In the elevator y140 configured in this way,
When the motor 97 operates, the screw shaft 99 is
moves forward or circularly, and the elevating frame 96 moves up or down.

The cutting device 31 is also equipped with a vacuum suction device 102 for collecting chips shown in FIGS. ing.

The repair work of the roll 5 performed using the cutting tool w, 31 will be explained. First, the roll stand 2 is removed from the rolling mill 1 shown in FIG. 1, and the removed roll stand 2 is placed on the stand 33 of the cutting device 31.

The work involves moving the roll stand 2 suspended by a crane.
As shown in FIG. 4, it is preferable to lower the bushings 60 to 63 along the guide rail 59 in a contracted state. When the roll stand 2 is placed on the platform 33, the lifting device 40 Raise or lower 33,
Either one of the pair of rolls 5.5, for example the upper roll 5, is placed at the same height as the cutting tool 90.
Next, extend the bushings 60°61 and install the roll stand 2.
Push the housing 4 to bring the processing reference seats 9a and 9b into contact with the receiving portion 53a of the receiving seat 53 as shown in FIG. 9 and the receiving seat 55 as shown in FIG. 1θ. Next, extend the buttons 62 and 63 and push the housing 4, and
0b to the receiving part 53b of the receiving seat 53 and the first
It is brought into contact with the catch seat 58 as shown in Figure 1. As a result, the housing 4 is positioned and fixed in a predetermined positional relationship with respect to the base frame 32 of the cutting device 31.

Next, the cylinder 72 is extended to couple the joint 74 of the roll drive shaft 73 with the joint 17 of the roll 5. Further, the expansion force of the cylinder 72 presses the roll 5 in its axial direction, and positions the roll 5 with respect to the housing 4.
Next, the cylinder 66 of the radial preload mechanism 65 is extended, and the roller 68 of the pressing body 67 is brought into pressure contact with the circumferential surface of the roll 5 at a position opposite to the cutting tool 90.

Next, the roll 5 is rotated by operating the motor 75 of the roll rotation drive device 38. In the rotating state, the cutting tool 9 is moved by moving the carriages 81 and 86.
0 in the axial direction and radial direction of the roll 5 to cut a groove 15 of a predetermined shape in the roll 5. During this cutting, the radial preload mechanism 65 cancels out the radial force that the roll 5 receives from the cutting tool 90, and as a result, the roll 5 is prevented from being displaced in the radial direction with respect to the housing 4. That is, cutting is performed while the roll 5 is positioned also in the radial direction with respect to the housing 4.

- The above-described cutting may be performed by automatically controlling the operating amounts of the motors 84 and 89, respectively, or by manually controlling them.

During cutting, the detection rod 92 of the roll position detection device 91 is brought into contact with the surface of the roll 5 to detect the surface position of the roll 5. Then, the detection signal is transmitted to the motor 84.
The cutting tool 90 is fed back to the control device 89.
The movement of the angle may be controlled.

After cutting the upper roll 5 as described above, the roll drive shaft 73, radial preload mechanism 65, cutting tool 90, etc. are retracted, and the pushers 60 to 63 are loosened. Then, the table 33 is moved upward by the lifting device 40, so that the vertical position of the lower roll 5 is aligned with the vertical position of the cutting tool 90, as shown in FIG. Then, the housing 4 is fixed and the roll 5 is positioned in the same manner as in the previous case, and the roll 5 is cut in this state.

Once the cutting of the upper and lower rolls is completed as described above, the roll drive shaft 73, radial preload mechanism 65,
The cutting tools 90 and the like are evacuated, and the housing 4 is unfixed by the bushings 60 to 63. Next, the roll stand 2 is lifted up with a crane and removed from the top of the stand 33, and is mounted on the original rolling mill 1 again. This completes the repair work for the roll 5.

In the embodiment described above, the roll stand 2 is moved up and down by vertical movement of the stand 33. However, the stand 33 may be fixed and the other components may be moved up and down.

In the cutting device 31, when moving the housing 4 of the roll stand 2 in the horizontal direction to determine its position,
Although the housing 4 may be slid horizontally on the platform 33, it is still preferable to configure the platform 33 as shown in FIG.

That is, in FIG. 12, the base 105 of the stand 33 is attached to the elevating frame 96. The base 105 has a recess 106 on its upper surface, in which a roller 107 is rotatably mounted. A movable frame 108 on which the housing 4 is placed rests on 107 at that time, and is movable in the horizontal direction with respect to the base 105. Note that the base 105 is equipped with a spring centering bin 109. The bin 109 has a biasing force that pushes the movable frame 108 in the horizontal direction. Then, when the roll stand 2 is not placed on the movable frame 108, the movable frame 108 is centered at the center of its movable range.

When the hanging 4 placed on the movable frame 108 is pushed horizontally by the button 60.61 (or 62.63), the movable frame 108 on the rollers 107 smoothly moves horizontally with respect to the base 105. Displace.

(Effects of the Invention) As described above, in the present invention, when repairing the grooves of worn rolls, the repair can be carried out with fewer man-hours. If the number of man-hours is small, the labor cost is reduced accordingly. There are sufficient advantages. Also, the amount of time required for repairs is small,
This has the advantage of shortening downtime of the rolling line.

Moreover, when cutting the grooves on the roll during the above repair work, it can be done while the roll is still attached to the housing.
Moreover, in this case, there is an advantage that cutting can be performed while the roll is positioned at a predetermined distance with respect to the housing. If the roll can be cut with the roll attached to the housing and positioned in this way, then just by removing the roll stand from the rolling machine, the removed roll stand can be attached to this cutting machine and the cutting work can be performed. . As a result, there is an effect that the number of work steps described above can be reduced.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, and FIG. 1 is a front view of a rolling mill, FIG. 2 is a perspective view of a roll stand, and FIG. 3 is a perspective view of the roll stand viewed from a different direction from FIG. 2. , FIG. 4 is a plan view of the roll cutting device when the roll stand is not yet installed, FIG. 5 is a partial plan view showing the roll cutting device when the roll is being cut, and FIG. 6 is a plan view of the roll cutting device when the roll rotation drive device is installed. A vertical cross-sectional view of the roll cutting device when it is not yet connected to the roll of the roll stand, and FIG. 7 is a vertical cross-sectional view showing the roll cutting device in a different cutting position from FIG. 6 when the upper roll is being cut. , Fig. 8 is a partial vertical sectional view showing the roll cutting device when the lower roll is cut, and Figs. 9, 10, and 11 show the relationship between the reference body of the roll cutting device and the processing reference seat of the roll stand, respectively. 12 is a horizontal cross-sectional view showing the relationship in detail; FIG. 12 is a vertical cross-sectional view showing different embodiments of a stand for mounting a roll stand; FIG.
(D) is a diagram illustrating a conventional cutting method for rolls. 2... Roll stand, 4... Hanging, 5...
- Roll, 31... Roll cutting bag 2. 32... Base frame, 33... Stand, 36... Fixing means, 37... Roll positioning means, 38... Roll rotation driving means, 90
...Cutting tools. Figure 2 Figure 3 96- Figure 8 Figure 10 Figure 9 Figure 11 Figure 12

Claims (1)

[Claims] 1. Removing a roll stand including a housing and a rolling roll rotatably attached to the housing from the rolling mill; fixing the removed roll stand; and a step of moving the roll in the roll stand toward the housing in its own axial direction; a step of cutting the roll moved in the axial direction; and a step of unfixing the roll stand after the roll has been cut; A method for repairing rolls of a rolling mill, including the step of mounting the unfixed roll stand on the rolling mill. 2. A base frame, a stand provided on the base frame for mounting the roll stand, means for fixing the housing of the roll stand placed on the stand to the base frame, and a means for fixing the housing of the roll stand placed on the stand; means for moving the roll in its axial direction; roll rotation drive means provided on the base frame for rotating the roll; and a cutting tool provided on the base frame for cutting the roll. and roll cutting equipment. 3. The roll cutting device according to claim 2, wherein the stand is movable up and down with respect to the base frame, and the base frame is provided with a lifting device for moving the stand up and down. 4. The roll cutting device according to claim 2, wherein the base frame is provided with a radial preload mechanism for pushing the roll toward the cutting tool at a position opposite to the cutting tool with respect to the roll. 5. The roll according to claim 2, wherein the base frame is provided with a reference body for receiving a processing reference seat provided on the side surface of the housing in the roll stand and for positioning the housing in the horizontal direction with respect to the base frame. cutting equipment.