JP6634786B2 - Rolling bearing inspection parts for multi-high rolling mill, and method for detecting damage to roll bearing for multi-high rolling mill - Google Patents

Description

The present invention is a roll bearing inspection components of a multistage rolling mill, relates damage detection method of roll bearings for 及 beauty multi-high rolling mill, and more particularly, while the bearing backup rolls assembled state the multi-high rolling mill, the roll bearing inspection part of a multi-stage rolling mill can be inspected for damage of the bearing, damage detection method of roll bearings for 及 beauty multi-high rolling mill.

  2. Description of the Related Art Conventionally, a rolling mill that manufactures a sheet material made of a steel material has a work roll that presses and holds a steel material during rolling and a work roll that prevents rolling of the work roll to obtain a plate material having a uniform thickness. A multi-stage rolling mill including one or a plurality of intermediate rolls that rotatably support a surface and a backup roll that supports the intermediate rolls on the outside thereof to prevent bending of a work roll is often used.

  In general, double-row cylindrical roller bearings are widely used as backup rolls for multi-high rolling mills. Since the outer peripheral surface of the outer ring comes into direct contact with the intermediate roll and is used in severe operating environments such as high speed rotation, water, high temperature, severe vibration, and heavy load, this backup roll bearing has indentations, galling, Damage such as scratches and cracks may occur. For this reason, in order to suppress the progress of the damage, the surface of the outer peripheral surface is periodically polished.

  Patent Literature 1 discloses a bearing load state diagnosis method in which a bearing load state is diagnosed by measuring a change in retained austenite due to fatigue in bearing steel using an eddy current sensor. Patent Document 2 discloses a method of measuring a change in impedance of a bearing before and after use by an eddy current measuring device to predict a remaining life of the bearing.

Japanese Patent No. 4013056 International Patent Publication No. 2011/076544

  By the way, damage to the outer peripheral surface of the outer ring of the backup roll bearing significantly reduces the bearing function, and if the damage progresses, there is a risk of developing a problem such as sudden stoppage of the operation line. Further, when the outer peripheral surface of the outer race is polished again, tempering or the like due to the repolishing occurs, and peeling or cracking may occur at an early stage from the tempered portion. For this reason, it is required to easily detect damage to the outer peripheral surface of the outer ring of the bearing and to suppress damage during use or re-polishing.

  The technique of Patent Document 1 diagnoses the load state of the bearing, and the technique of Patent Document 2 measures the degree of progress of metal fatigue. In each case, the damage of the outer peripheral surface of the outer ring of the backup roll bearing is detected. It does not do.

The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a multi-stage rolling apparatus capable of detecting damage to a plurality of bearings without removing a bearing incorporated in a bag-up roll from a multi-stage rolling mill. machine roll bearing inspection part, is to provide a damage detection method of roll bearings for 及 beauty multi-high rolling mill.

The above object of the present invention is achieved by the following configurations.
(1) A bearing inspection component for a roll of a multi-high rolling mill for inspecting a bearing constituting a backup roll of the multi-high rolling mill,
At least one eddy current sensor;
A support that can be attached to the intermediate roll attachment position, and that holds the eddy current sensor movably in the axial direction;
A bearing inspection component for rolls of a multi-high rolling mill, comprising:
(2) The eddy current sensor includes a plurality of eddy current sensors capable of detecting the outer peripheral surfaces of the plurality of bearings of the backup roll, respectively.
The bearing inspection component for a roll of a multi-high rolling mill according to (1), wherein the support holds the plurality of eddy current sensors movably in an axial direction.
(3) The support is formed in a cylindrical shape with an axial groove formed along the axial direction so as to hold the eddy current sensor movably in the axial direction. The bearing inspection component for rolls of a multi-high rolling mill according to 1) or (2).
(4) A work roll for rolling a member to be rolled, and at least two stages of intermediate rolls and backup rolls each supporting the work roll, wherein the backup roll has a plurality of bearings. A damage detection method,
A step of attaching the roll bearing inspection component according to any one of (1) to (3) to at least one of the attachment positions of the intermediate roll facing the backup roll;
A step of detecting whether or not the outer peripheral surfaces of the outer races of the plurality of bearings of the backup roll are damaged by the eddy current sensor;
A method for detecting damage to a roller bearing for a multi-high rolling mill, comprising:
(5) The detecting step detects whether or not the entire outer peripheral surfaces of the outer races of the plurality of bearings of the backup roll are damaged while rotating the backup roll and moving the eddy current sensor in the axial direction. (4) The method for detecting damage to a roll bearing of a multi-high rolling mill according to (4) .
(6) The detecting step includes detecting whether or not the outer peripheral surfaces of the outer races of the plurality of bearings of the plurality of backup rolls facing the roll bearing inspection component are rotated while rotating the support. The method for detecting damage to a roll bearing of a multi-high rolling mill according to the above (4) or (5) .

Multi-high rolling mill roll bearing inspection component of the present invention, according to 及 beauty flaw detection method of the multi-stage rolling mill backup roll bearings for without removing the bearing incorporated in the bag up roll from the multi-high rolling mill, a plurality of Damage to the outer peripheral surface of the outer ring of the bearing can be detected.

It is sectional drawing of the rolling roll part of the multi-high rolling mill which concerns on this invention. (A) is a sectional view of a main part showing a state in which the presence or absence of damage to the outer ring surface of a bearing is detected by a roll bearing inspection component of a multi-high rolling mill, (b) is a plan view of a roll bearing inspection component of a multi-high rolling mill, (C) is a side view of the rolling bearing inspection component of the multi-high rolling mill. FIG. 2 is a cross-sectional view of the multi-high rolling mill in a state where a second intermediate roll of the multi-high rolling mill shown in FIG. 1 is replaced with a rolling bearing inspection component of the multi-high rolling mill.

Hereinafter, a multi-high rolling mill according to an embodiment of the present invention and a rolling bearing inspection component thereof will be described in detail with reference to the drawings.
As shown in FIG. 1, the multi-high rolling mill 10 is provided with a plurality of types of rolling rolls in a housing 11. The transported steel material (member to be rolled) P is formed into a uniform thickness by the rolling rolls. To roll. The rolling roll group includes a pair of work rolls 12 for rolling the steel material P and a plurality (first and second upper and lower two in the embodiment shown in FIG. 1, a total of four) of the pair of work rolls 12 rotatably supported. An intermediate roll 13 and a plurality of (in the embodiment shown in FIG. 1, three upper and lower, a total of six) second intermediate rolls 14 rotatably supporting these first intermediate rolls 13 are provided. Each second intermediate roll 14 is assembled to a backup roll shaft 16 and is backed up by a plurality of backup rolls 15 (four in each of the upper and lower portions in the embodiment shown in FIG. 1, a total of eight in the embodiment shown in FIG. 1). I have. In addition, six to eight bearings 20 are usually attached to one backup roll 15, but FIG. 2 shows only three bearings at one end in the axial direction.

  The second intermediate roll 14 is rotatably supported at a mounting position in the housing 11 via a rolling bearing.

  In addition, the backup roll 15 is attached to the housing 11 via a saddle 18 and the like disposed between the bearings 20. The saddle 18 controls the position of the backup roll 15 in a direction orthogonal to the backup roll shaft 16 via a saddle receiver (not shown) fitted to an eccentric shaft (not shown) to control the thickness of the steel material P. It has become. Each backup roll shaft 16 is always kept stationary (non-rotating state).

  As shown in FIG. 2, the bearing 20 is fitted and fixed to the backup roll shaft 16, and has an inner ring (stationary wheel) 21 having an inner ring raceway surface 21 a on an outer peripheral surface, and is rotatably arranged facing the inner ring 21. An outer ring (rotating wheel) 22 having a pair of outer ring raceway surfaces 22a on the inner peripheral surface, and a plurality of cylindrical rollers (rolling elements) that are arranged in a double row so as to roll freely between the inner ring raceway surface 21a and the outer ring raceway surface 22a. ) 23, a cage 24 for holding the cylindrical rollers 23 at equal intervals, and a pair of spacers 25 provided on both sides in the axial direction of the inner ring 21. A double-row cylindrical roller bearing used for outer ring rotation. is there.

  In such a multi-high rolling mill 10, the outer ring 22 of the bearing 20 is in pressure contact with the plurality of second intermediate rolls 14, and is positioned so as to be rotatable together with the second intermediate rolls 14. In this case, the pressure from each outer ring 22 acts on the pair of work rolls 12 from the second intermediate roll 14 via the first intermediate roll 13, thereby preventing the work roll 12 from bending. Thereby, the conveyed steel material P is rolled to a uniform thickness by the pair of work rolls 12.

  The bearing 20 is lubricated by a so-called oil mist system in which lubricating oil from a lubricating oil supply source (not shown) is supplied by being conveyed by compressed air.

  Since the outer race 22 of the backup roll 15 is used in a severe environment such as a high temperature and a high load, the outer peripheral surface 22b may be damaged. For this reason, conventionally, maintenance work such as removing the bearing 20 from the multi-high rolling mill 10 and periodically repolishing the outer peripheral surface 22b of the outer ring 22 has been generally performed. However, the multi-high rolling mill 10 of the present embodiment replaces the second intermediate roll 14 disposed opposite to the outer ring 22 of the backup roll 15 to be inspected with a roll bearing inspection component 30, thereby changing the bearing 20 into a multi-stage. It is possible to inspect the outer peripheral surface 22b of the outer ring 22 of the plurality of bearings 20 for damage at the same time without removing it from the rolling mill 10.

As shown in FIG. 2, the roller bearing inspection component 30 has a columnar support 31 having substantially the same diameter as the second intermediate roll 14 and being replaceable with the second intermediate roll 14. Both ends 31 a of the support 31 (only one end in the axial direction is shown in FIG. 2) can be assembled in the housing 11 via the rolling bearing 19. That is, the roll bearing inspection component 30 can be assembled in place of the second intermediate roll 14.
Note that, as in the present embodiment, the rolling bearing 19 is fitted to both ends 31 a of the support body 31 to form the roll bearing inspection component 30, and is mounted at the intermediate roll mounting position in the housing 11. Good. Alternatively, the rolling bearing 19 is used as a common part for the rolling bearing inspection component 30 and the second intermediate roll 14, and the rolling bearing 19 itself constitutes an intermediate roll mounting position, and both ends of the support 31 of the rolling bearing inspection component 30. The portion 31a may be fitted.

  A substantially U-shaped axial groove 33 is formed on the outer peripheral surface of the support 31 along the axial direction. In the axial groove 33, the same number of eddy current sensors 40 as the bearings 20 of the backup roll 15 are provided. Each eddy current sensor 40 is arranged to face the outer ring 22 of the bearing 20, and is movable in the axial direction along the outer peripheral surface 22 b of the outer ring 22. Each eddy current sensor 40 rotates together with the support 31.

The eddy current sensor 40 has a coil (not shown) facing the outer peripheral surface 22b of the outer ring 22. When an exciting current flows through the coil, a coil generated by an eddy current induced on the outer peripheral surface 22b of the outer ring 22 Is detectable. Since the impedance of the coil changes depending on the state of damage (scratch, crack, peeling, etc.) of the outer peripheral surface 22b of the outer race 22, the presence or absence of the outer peripheral surface 22b and the degree of damage are detected by detecting the change in impedance. be able to. The coil of each eddy current sensor 40 is connected via a wiring 41 to an impedance measuring device (not shown).
Further, although early peeling may occur from the tempered portion, the eddy current sensor 40 can detect the early peeling, so that it is possible to specify the location where the tempering occurs.

Next, a specific method for inspecting the outer peripheral surface 22b of the outer ring 22 of the bearing 20 for damage will be described.
First, as shown in FIG. 3, the backup roll 15 to be inspected, for example, the second intermediate roll 14 facing the backup roll 15A is replaced with a roll bearing inspection component 30 (30A) and held on the support 31. The eddy current sensor 40 thus arranged is arranged to face the backup roll 15A. Thereby, one eddy current sensor 40 is arranged to face one outer ring 22. At this time, the support body 31 of the roll bearing inspection component 30A may abut on the outer peripheral surface 22b of the outer ring 22 of the backup roll 15A, or may face the outer peripheral surface 22b of the outer ring 22 with a gap therebetween. You may.

  Next, while rotating the outer ring 22 of the backup roll 15A, the eddy current sensor 40 is moved in the axial direction, and the impedance value is measured over the entire outer peripheral surface 22b of each outer ring 22. The measured impedance value is compared with a predetermined reference impedance value for pass / fail determination. If the measured impedance value is equal to or larger than the reference impedance value, the outer peripheral surface 22b of the outer ring 22 is damaged. Therefore, measures such as replacement of the bearing 20 or re-grinding of the outer ring 22 are performed.

  Since the inspection area of the eddy current sensor 40 has a certain detection width, the entire outer peripheral surface 22b can be formed by moving the eddy current sensor 40 continuously or by moving the eddy current sensor 40 so as to partially overlap. Can be inspected.

  Further, since one eddy current sensor 40 is disposed on the outer peripheral surface 22b of each outer ring 22 so as to face each other, a plurality of outer rings 22 can be inspected simultaneously in one inspection process. Further, the inspection can be performed without removing the backup roll 15 (the bearing 20) from the multi-high rolling mill 10, and the inspection efficiency is greatly improved.

  Subsequently, in order to inspect the adjacent backup roll 15 (15B), the support 31 of the roll bearing inspection component 30A is rotated so that each eddy current sensor 40 faces the outer ring 22 of the backup roll 15B. Similarly to the above, the outer ring 22 of the backup roll 15B is rotated and the eddy current sensor 40 is moved in the axial direction to detect a change in the impedance of the coil, and the outer peripheral surface 22b of the outer ring 22 of the backup roll 15B is inspected.

  As shown in FIG. 3, after inspecting the second intermediate roll 14 facing the backup rolls 15A and 15B using the roll bearing inspection component 30, the second intermediate roll 14 facing the backup rolls 15C and 15D, The second intermediate rolls 14 facing the rolls 15E and 15F and the second intermediate rolls 14 facing the backup rolls 15G and 15H are inspected by sequentially exchanging them with roll bearing inspection parts 30, respectively. The outer peripheral surface 22b of each outer ring 22 included in the backup rolls 15A to 15H can be inspected at the same time without being removed from the multi-high rolling mill 10, and the number of inspection steps can be greatly reduced.

In the above description, the same number of eddy current sensors 40 as the bearings 20 are arranged in a row on the support 31 of the roll bearing inspection component 30. However, the support 31 has two axial grooves. 33, the eddy current sensors 40 each having the same number as the bearings 20 are arranged in two rows in a V-shape, and are simultaneously opposed to the backup rolls 15A and 15B adjacent to each other, so that each outer ring of the backup rolls 15A and 15B is formed. 22 can be inspected simultaneously.
Further, by preparing four roll bearing inspection parts 30 (30A, 30B, 30C, 30D) and simultaneously inspecting four backup rolls 15A to 15H at a time, the inspection time can be further reduced.

  As described above, according to the rolling bearing inspection component 30 of the multi-high rolling mill of the present embodiment, the support 31 attachable to the mounting position of the second intermediate roll 14 and the axial groove 33 of the support 31 A plurality of eddy current sensors 40 held movably in the axial direction are provided. Therefore, by attaching the support 31 to the attachment position of the second intermediate roll 14, the eddy current sensor 40 can detect whether or not the outer peripheral surface 22 b of the outer ring 22 of the plurality of bearings 20 of the backup roll 15 is damaged. . Thereby, the outer peripheral surfaces 22b of the plurality of outer rings 22 can be inspected simultaneously without removing the bearing 20 from the multi-high rolling mill 10.

  Further, the multi-high rolling mill 10 of the present embodiment includes a work roll 12 for rolling the steel material P, a first intermediate roll 13 and a second intermediate roll 14 supporting the work roll 12, and a plurality of cylindrical roller bearings 20. A backup roll 15. The roll bearing inspection component 30 can be attached to the mounting position of the second intermediate roll 14, and the eddy current sensor 40 of the roll bearing inspection component 30 detects the outer peripheral surface 22 b of the outer ring 22 of the plurality of bearings 20 of the backup roll 15. The bearing 20 is rotatably disposed to detect the presence or absence of damage to the outer peripheral surface 22 b of the outer ring 22 of the plurality of bearings 20. The outer peripheral surface 22b can be inspected at the same time.

  Further, according to the roll bearing damage detection method of the present embodiment, the step of mounting the roll bearing inspection component 30 at the mounting position of the second intermediate roll 14 and the plurality of bearings of the backup roll 15 are performed by the eddy current sensor 40. 20 for detecting the presence or absence of damage to the outer peripheral surface 22b of the outer race 22. The detecting step includes rotating the backup roll 15 and moving the eddy current sensor 40 in the axial direction, or rotating the support 31. Is performed, the presence or absence of damage on the entire outer peripheral surface 22b of the outer ring 22 of the plurality of bearings 20 of the backup roll 15 facing the roll bearing inspection component 30 is detected. Can be detected.

It should be noted that the present invention is not limited to the above-described embodiment, and can be appropriately modified, improved, and the like.
For example, the support of the present invention is not limited to the columnar shape as in the present embodiment, but can be mounted at the mounting position for the intermediate roll, and holds the eddy current sensor movably in the axial direction. Other shapes may be used as long as they have a configuration.
Further, the roller bearing inspection component of the present invention may have a configuration having at least one eddy current sensor movable in the axial direction with respect to the support.

10 Multi-high rolling mill 12 Work roll 13 1st intermediate roll (intermediate roll)
14 2nd intermediate roll (intermediate roll)
15, 15A, 15B, 15C, 15D, 15E, 15F, 15G, 15H Backup roll 20 Bearing (cylindrical roller bearing)
22 Outer ring 22b Outer peripheral surface 30, 30A, 30B, 30C, 30D Rolling bearing inspection component 31 Support 33 Axial groove 40 Eddy current sensor P Steel (rolled member)

Claims (6)

A bearing inspection component for a roll of a multi-high rolling mill for inspecting a bearing constituting a backup roll of the multi-high rolling mill,
At least one eddy current sensor;
A support that can be attached to the intermediate roll attachment position, and that holds the eddy current sensor movably in the axial direction;
A bearing inspection component for rolls of a multi-high rolling mill, comprising: The eddy current sensor includes a plurality of eddy current sensors capable of respectively detecting the outer peripheral surfaces of the plurality of bearings of the backup roll,
2. The bearing inspection component for a roll of a multi-high rolling mill according to claim 1, wherein the support holds the plurality of eddy current sensors movably in an axial direction. 3.   The said support is provided with the axial groove formed along an axial direction so that the said eddy current sensor may be movably held in an axial direction, and may be formed in the column shape. 3. The bearing inspection component for rolls of the multi-high rolling mill according to 2. A work roll for rolling a member to be rolled, and at least two stages of intermediate rolls and backup rolls respectively supporting the work rolls, wherein the backup roll has a plurality of bearings. And
A step of mounting the roll bearing inspection component according to any one of claims 1 to 3, at least at one of the mounting positions of the intermediate roll facing the backup roll,
A step of detecting whether or not the outer peripheral surfaces of the outer races of the plurality of bearings of the backup roll are damaged by the eddy current sensor;
A method for detecting damage to a roller bearing for a multi-high rolling mill, comprising: The detection step detects the presence or absence of damage on the entire outer peripheral surfaces of the outer races of the plurality of bearings of the backup roll while rotating the backup roll and moving the eddy current sensor in the axial direction. Item 5. The damage detection method for a roll bearing of a multi-high rolling mill according to Item 4 . The detecting step detects the presence or absence of damage to the outer peripheral surfaces of the outer races of the plurality of bearings of the plurality of backup rolls facing the roll bearing inspection component while rotating the support. A method for detecting damage to a roller bearing for a multi-high rolling mill according to claim 4 or 5 .

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