JP7095375B2 - Bearing abnormality diagnosis method and bearing abnormality diagnosis system - Google Patents

Description

The present invention relates to a technique for diagnosing an abnormality in a bearing.

Production machines such as casting machines and paper machines that use bearings are regularly maintained. In this type of production machine, bearings are removed from the housing of the production machine during the regular maintenance, and maintenance such as disassembly, cleaning, and inspection is performed.

Japanese Unexamined Patent Publication No. 2004-198246

Here, if the bearing can be replaced by grasping the abnormality of the bearing in advance (especially before the abnormality occurs) at the time of the above maintenance, the production machine is operated due to the peeling of the bearing raceway surface during the operation of the production machine. You can prevent the stop. In addition, it is possible to prevent the manufactured product from being damaged by peeling pieces.
To solve such problems, for example, the technique described in Patent Document 1 detects a change in impedance caused by an eddy current, and measures the amount of decrease in retained austenite due to a change in structure in steel due to progress of fatigue as a whole bearing. Then, the load state of the bearing is diagnosed by comparing the bearing fatigue tendency information and the bearing pattern information, thereby investigating the cause of damage such as early peeling of the bearing raceway surface and investigating the user's equipment problems. It is said that it can be used as a means to find out how to improve it.

However, the technique described in the same document is a technique for estimating the load state of a bearing by detecting a change in impedance caused by an eddy current, and in the same document, the presence or absence of an abnormality in the bearing and its degree and effect are causal. The relationship is not described, and therefore, there remains a problem to be solved as a technique for diagnosing the presence or absence of an abnormality in the bearing before disassembling the bearing.
Therefore, the present invention has been made by paying attention to such a problem, and provides a bearing abnormality diagnosis method and a bearing abnormality diagnosis system capable of diagnosing the presence or absence of bearing abnormality before disassembling the bearing. The challenge is to do.

In order to solve the above problems, the method for diagnosing an abnormality in a bearing according to one aspect of the present invention includes a measurement step of measuring magnetic fields at a plurality of measurement positions with respect to the bearing, and a magnetic field measurement surface measured in the measurement step. Includes an information generation step of generating magnetic field distribution information of the north and south poles of the magnetic field of the magnetic field, and a diagnostic step of diagnosing the bearing based on the magnetic pole distribution information generated in the information generation step. It is a feature.
However, the "magnetic field measurement surface" means a rolling surface and / or a raceway surface to be measured by the bearing.

Further, in order to solve the above-mentioned problems, the bearing abnormality diagnosis system according to one aspect of the present invention implements the bearing abnormality diagnosis method according to one aspect of the present invention using an information processing apparatus including a computer. The magnetic field information acquisition step for acquiring information on the magnetic fields at a plurality of measurement positions on the magnetic field measurement surface of the bearing measured by the magnetic field measuring device, and the magnetic field measurement acquired in the magnetic field information acquisition step. An information generation step that generates each measured value of a magnetic field at a plurality of measurement positions on a surface as the magnetic field distribution information according to the magnetic field properties of the N pole and the S pole and their strength, and the generated magnetic field property distribution. It is characterized by including a diagnostic step for diagnosing the presence or absence of an abnormality in a bearing and the degree of progress thereof based on information.

According to the present invention, by grasping the change in the magnetic field on the magnetic field measurement surface of the bearing as the magnetic pole property between the N pole and the S pole and the magnetic pole property distribution information according to the strength thereof, the abnormality of the bearing before the bearing is disassembled. The presence or absence can be diagnosed.

It is a figure explaining one Embodiment of the bearing abnormality diagnosis system used in the bearing abnormality diagnosis method which concerns on this invention, FIG. It is a block diagram. It is a figure explaining one Embodiment of the bearing which diagnoses an abnormality by the abnormality diagnosis method of the bearing which concerns on this invention, and the figure shows the main part of the cross section along the axis in an enlarged manner. It is a schematic diagram ((a), (b)) explaining one embodiment of the bearing abnormality diagnosis method by the bearing abnormality diagnosis system which concerns on this invention. It is explanatory drawing of an example of the magnetic field measurement surface in the abnormality diagnosis method of a bearing which concerns on this invention, and this figure shows the load area of a bearing raceway surface expanded. It is explanatory drawing of an example of the magnetic field measurement surface in the abnormality diagnosis method of a bearing which concerns on this invention, and this figure shows the load area of a bearing raceway surface expanded. It is a figure explaining an example of the rolling posture of the rolling element of the rolling bearing which diagnoses an abnormality by the abnormality diagnosis method of the bearing which concerns on this invention, FIG. The image (at the time of misalignment) is shown. The figure which shows the reference example which was adopted in the abnormality diagnosis method of a bearing which concerns on this invention, and was color-coded according to the magnitude of a magnetic field (first identification information), and shade-coded by the density of the basic color (second identification information). Is. However, in the monitor displays shown in FIGS. 7 to 10, the red image is indicated by the symbol N and the blue image is indicated by the symbol S because it is difficult to display colors in the publication. 4 is a diagram showing an image of a monitor display example of image information when the magnetic field measurement surface is normal as a result of diagnosis by the bearing abnormality diagnosis method according to the present invention on the magnetic field measurement surface shown in FIGS. 4 to 5. An image information monitor display example when a rolling element is misaligned with respect to the magnetic field measurement surface as a result of diagnosis by the bearing abnormality diagnosis method according to the present invention on the magnetic field measurement surface shown in FIGS. 4 to 5. It is a figure which shows the image. 4 is a diagram showing an image of a monitor display example of image information when the magnetic field measurement surface is abnormal as a result of diagnosis by the bearing abnormality diagnosis method according to the present invention on the magnetic field measurement surface shown in FIGS. 4 to 5. It is a schematic diagram explaining another embodiment of the bearing abnormality diagnosis method by the bearing abnormality diagnosis system which concerns on this invention.

Hereinafter, embodiments and examples of the present invention will be described with reference to the drawings as appropriate. The drawings are schematic. Therefore, it should be noted that the relationship, ratio, etc. between the thickness and the plane dimension are different from the actual ones, and there are parts where the relationship and ratio of the dimensions are different between the drawings. Further, the embodiments shown below exemplify devices and methods for embodying the technical idea of the present invention, and the technical idea of the present invention describes the material, shape, structure, and arrangement of constituent parts. Etc. are not specified in the following embodiments or examples.

<Abnormal diagnosis system>
FIG. 1 shows an embodiment of a bearing abnormality diagnosis system used in the bearing abnormality diagnosis method according to the present invention. As shown in the figure, this abnormality diagnosis system includes a teslamometer (magnetic field measuring device) 10 and an information processing device 7.
The teslamometer 10 is a measuring instrument that measures a magnetic field (magnetic flux density), and as shown in the figure, it has a box-shaped main body 5 that can be carried by hand and can display measured values, and a signal line on the main body 5. It has a probe 2 connected via 6.
A magnetoreceptive portion 1 is provided at the end of the probe 2. Inside the magnetic sensing unit 1, a Hall element that outputs a voltage proportional to the magnetic field is provided, and a processing unit 3 that measures the magnetic field (magnetic flux density) from the output voltage of the Hall element is packaged in the probe 2. There is. In this embodiment, a manufacturer: Nippon Electromagnetic Meter (model number GV-400) was used as the teslamometer (magnetic field measuring instrument).

The probe 2 can measure a magnetic field (magnetic flux density) from the output voltage of a Hall element that outputs a voltage proportional to the magnetic field. The probe 2 is provided with an external output unit 4, and the external output unit 4 is configured to be able to output the measurement result of the magnetic flux (magnetic flux density) in the processing unit 3 to the main body unit 5 via the signal line 6. There is. Further, the main body portion 5 can output the measurement result of the magnetic field (magnetic flux density) in the processing unit 3 to the external information processing device 7.
The information processing apparatus 7 includes a computer and software for magnetic field monitoring, controls the teslamometer 10 by executing a predetermined monitoring process, records time-series magnetic field measurement data, and records the result of the process. , It can be displayed as image information that can be visually recognized by the operator on a display unit (not shown) such as a monitor.

In the abnormality diagnosis system of the present embodiment, the predetermined monitoring process executed by the information processing apparatus 7 is configured to be capable of executing the abnormality diagnosis process of the bearing including the magnetic field information acquisition step, the image information generation step, and the diagnosis step. Has been done.
The magnetic field information acquisition step is a step of acquiring the measured value which is the information of the magnetic fields of a plurality of measurement positions on the raceway surface 22 m which is the magnetic field measurement surface of the bearing 20 shown in FIG. 2, which is measured by the teslamometer 10. In the abnormality diagnosis system of the present embodiment, the magnetic field information acquisition step acquires the measured value of the magnetic field of the raceway surface 22 m at least in the load zone of the bearing 20. When acquiring information on the magnetic fields at a plurality of measurement positions, a scanning device (not shown) capable of scanning the measurement range may be used, or the operator may manually measure one point at a time.

In the image information generation step, each measured value of the magnetic field at a plurality of measurement positions on the raceway surface 22 m acquired in the magnetic field information acquisition step is color-coded with two different basic colors according to the magnetic pole properties of the N pole and the S pole. At the same time, by dividing each color-coded measurement value by the intensity of the basic color according to the magnitude of the magnetic field, each measurement value of the magnetic field at a plurality of measurement positions is shade-divided into two basic colors. This is a step to generate as image information.

In the abnormality diagnosis system of the present embodiment, in the image information generation step, the measured value of the magnetic field in the load zone of the bearing 20 is the color and the shade corresponding to the magnetic pole property between the N pole and the S pole and the distribution state of the magnitude thereof. The included image information is generated and the image information is displayed on the monitor. With such a configuration, the operator has excellent visibility when checking the abnormality diagnosis status on the monitor. Therefore, in addition to the processing in the diagnosis step, a person visually checks the presence or absence of the abnormality in the bearing 20 and the degree of progress thereof. Suitable for diagnosis.

The diagnosis step is a step of diagnosing the presence or absence of an abnormality in the bearing and the degree of progress thereof based on the image information generated in the image information generation step. In the abnormality diagnosis system of the present embodiment, the diagnosis step is based on the distribution of color shades of the displayed image information and the comparative information of the degree of abnormality associated with the image information in a contrastable manner. The presence or absence of 20 abnormalities and the degree of their progress are diagnosed.

<Bearing configuration>
FIG. 2 shows an embodiment of a bearing for diagnosing an abnormality by the bearing abnormality diagnosis method according to the present invention. The example shown in the figure is a self-aligning roller bearing. The bearing that can be diagnosed by the present invention is not limited to this, and any bearing such as a ball bearing, a conical bearing, or a cylindrical bearing may be used as long as the raceway ring is a cylindrical steel material. Further, when the roller (that is, the rolling surface on the outer periphery thereof) is the diagnosis target (that is, the magnetic field measurement surface), the roller may be a steel material.
As shown in the figure, the self-aligning roller bearing 20 of the present embodiment (hereinafter, also simply referred to as “bearing”) is arranged in two rows between the inner ring 21 and the outer ring 22 and the inner ring 21 and the outer ring 22. It has a plurality of spherical rollers 23 (hereinafter, also simply referred to as “rollers”), which are rolling elements that are arranged and rotatably held by a cage (not shown). The self-aligning roller bearing 20 has a roller 23, an inner ring 21, and an outer ring 22 made of a cylindrical steel material.

Each roller 23 is interposed between the raceway surface 22m, which is the magnetic field measurement surface of the outer ring 22, and the raceway surface 21m, which is the magnetic field measurement surface of the inner ring 21, and is rotatably held by a cage (not shown). .. A plurality of pockets for accommodating the rollers 23 are defined in the cage (not shown), and the rollers 23 are rotatably held in each pocket.
The inner ring 21 is formed with a double row of raceway surfaces 21m and 21m so that the central side in the axial direction (left-right direction in the figure) is convex. A substantially flat top surface 21t is formed at the central portion in the axial direction between the two raceway surfaces 21m and 21m. A pair of crossguards 21s and 21s are provided at both ends in the axial direction to prevent the rollers 23 from falling off to the outside of the bearing.
The outer ring 22 has a concave spherical surface 22m formed in a double row on the inner peripheral surface. Further, an oil hole 22h for injecting a lubricant is formed through the central portion of the outer peripheral surface of the outer ring 22 in the axial direction, and the lubricant can be supplied into the bearing 20 from the oil hole 22h.

In the self-aligning roller bearing 20 of the present embodiment, the inner ring 21 is attached to a support shaft (not shown) of an industrial machine, and the outer ring 22 is attached to a housing (not shown) of the industrial machine. When the inner ring 21 rotates together with the support shaft of the industrial machine, the roller 23 rolls between the inner ring raceway surface 21 m and the outer ring raceway surface 22 m. At this time, the lubricating oil supplied into the bearing 20 from the oil hole 22h of the outer ring 22 is supplied to each part of the bearing, the lubrication state of the contact surface of each part is maintained well, and the temperature rise, wear, and vibration due to heat generation are suppressed. Will be done.

<Measurement / Diagnostic Principle in the Present Invention>
The measurement / diagnosis principle of the present invention is based on the change in the magnetic field of the magnetic field measurement surface in the load zone of the bearing, and in particular, the magnetic pole property of the raceway surface 22 m in the load zone of the rolling bearing 20 as in the present embodiment. It is based on distribution information.
That is, for example, in a used state in which the inner ring 21 rotates, as shown in FIG. 3A, the raceway surface 22m of the outer ring 22 is repeatedly loaded with the movement of the rolling element 23. As a result, the raceway surface 22m of the outer ring 22 undergoes a structural change due to fatigue (decrease in martensitic structure strain and reduction in retained austenite) and a change in bearing magnetization due to metal contact, which has the opposite effect of magnetostriction. The magnetic characteristics change with the deformation of the raceway surface 22 m. Therefore, if the change in the magnetic characteristics is monitored by using the teslamator (magnetic field measuring instrument) 10 as shown in FIG. 3 (b), the presence or absence of an abnormality in the raceway surface 22 m is based on the state of the tissue change due to fatigue. And its progress can be diagnosed.

<About misalignment>
Here, as shown in FIG. 6A as an example of the rolling posture of the rolling element, if the rolling posture of the rolling element is a normal posture, the roller bearing reaches the end of its life due to fatigue and is damaged. Generally many. However, as shown in FIG. 6B, the rolling posture of the rolling element is tilted due to an excessive load being applied to the bearing or deterioration of the accuracy of the bearing mounting target (for example, the rotating shaft or the housing). If the raceway surface or the like tilts from the center of the axis (α) and misalignment occurs, unexpected damage such as premature peeling or wear of the raceway surface may occur.

Therefore, the magnetic field before the detachment of the magnetic field measurement surface such as the raceway surface is detected, and the bearing abnormality is based on the comparison between the distribution of magnetic pole properties of the magnetic field and the degree of abnormal progress associated with it. By diagnosing the presence or absence of the bearing and the degree of its progress, the bearing or the like can be replaced without causing the magnetic field measurement surface of the bearing to peel off.
That is, if the bearing can be properly replaced at the time of maintenance by grasping the abnormality of the bearing in advance, it is possible to prevent the unexpected stop during the operation of the production machine due to the peeling of the magnetic field measurement surface. It also prevents the manufactured product from being damaged by flaking pieces.

<Abnormal diagnosis method>
In the present embodiment, the self-aligning rolling bearing 20 shown in FIG. 2 is prepared, and the abnormality diagnosis system shown in FIG. 1 is used for the raceway surface 22 m of the outer ring 22 thereof, and the size of the measuring unit 1 of the teslamometer 10 is large. As shown in FIG. 4, a mesh is provided in the measurement range of the load zone of the raceway surface 22 m of the outer ring 22, and a plurality of measurements are performed on the raceway surface 22 m of the bearing 20. The magnetic field at the position is measured in order with the teslamometer 10 to obtain a measured value (magnetic field information acquisition step: measurement step).

The measurement result is sent to the information processing apparatus 7, and the information processing apparatus 7 sets each measured value of the magnetic field on the magnetic field measurement planes at the plurality of points according to the magnetic pole properties of the north and south poles of the magnetic field. The image information is color-coded according to one basic color and shaded according to the intensity of the basic color according to the magnitude of the magnetic field (information generation step: information generation step).
Further, the information processing apparatus 7 displays the generated image information on the monitor, and diagnoses the presence or absence of an abnormality on the steel track surface based on the comparison between the generated image information and the causal relationship between the degree of abnormality progress. (Diagnosis step: Diagnostic process). The abnormality diagnosis may be determined by the operator visually observing the image information regardless of the program executed by the information processing apparatus 7.

<< Example: Confirmation test >>
Under the following test conditions, the observation section (see FIG. 5) in the load zone of the track surface 22 m was observed. Here, for example, as a measurement range, as shown in FIG. 5, a range of ± 60 ° (a range of 120 ° in the circumferential direction = a range of 1/3 of the bearing raceway surface) is measured around the position where the load is most applied. It is desirable to do. Further, as an example of a mesh provided according to the size of the measuring unit 1 of the teslamometer 10, it is preferable to divide the measurement range into 20 mm × 20 mm as shown in FIG. 4, for example.
Testing machine name: Ball bearing life testing machine Bearing used: Nominal number 23152 (self-aligning roller bearing)
Test load: Radial load 52.4tf (P / C = 0.4)
Bearing rotation speed: 800 rpm
Lubrication method: Forced circulation refueling

In this embodiment, as a method for diagnosing an abnormality in the bearing, the magnetic fields at a plurality of measurement positions on the raceway surface 22 m of the bearing 20 are measured by a teslamator (magnetic field measuring device) 10 (measurement step), and each of the magnetic fields at the plurality of points is measured. The measured values are color-coded (first identification information) with two different basic colors according to the magnetic pole properties of the north and south poles of the magnetic field, and the density of the basic colors according to the magnitude of the magnetic field is used for shading. The divided (second identification information) image information is generated as magnetic pole distribution information (information generation step), and based on the generated image information, a state such as an abnormality of the raceway surface 22 m is diagnosed (diagnosis step).

In this embodiment, the self-aligning rolling bearing 20 shown in FIG. 2 was disassembled to remove deposits such as dirt on the surface of the raceway surface 22 m of the outer ring 22.
Next, using the abnormality diagnosis system shown in FIG. 1, the raceway surface of the outer ring 22 is adjusted to the size (area XY (see FIG. 1)) of the measuring unit 1 of the teslamometer (Gauss meter (magnetic field measuring instrument)) 10. A mesh is actually provided in a load zone of 22 m, and the magnetic fields on the inner peripheral surface of each region divided by the mesh are sequentially provided as a plurality of measurement positions on the raceway surface of the bearing, as shown in FIG. 3 (b). The measured values were obtained by measuring with the teslamometer 10 respectively. In this example, both the non-running surface and the raceway surface where the oil holes are arranged were measured.
In this embodiment, the two basic colors are a display example in which the N polarity is red and the S polarity is blue, but in the monitor display shown in FIGS. 7 to 10, it is difficult to display the drawings in color in the publication. For this reason, the red image is indicated by the symbol N, and the blue image is indicated by the symbol S.

FIG. 8 shows the result of the magnetic pole distribution information after 60 hours when the bearing assembly is normal.
As shown in the figure, if the bearing assembly is normal, it can be seen that the magnetic poles are uniformly distributed over the entire raceway surface. In the present embodiment, the magnetic pole distribution information (image information) in the figure is comparative information of the degree of abnormal progress having a causal relationship with the generated image information. As described above, as the comparison information of the degree of abnormal progress, it is possible to use the magnetic pole distribution information when the presence or absence of abnormality in the raceway surface of the corresponding bearing and the degree of the degree of progress are obtained in advance by the experiment.

Here, as shown in FIG. 8, when the bearing is normally assembled, the magnetic poles have a magnetic field distribution that is uniform to some extent over the entire raceway surface. On the other hand, as an example of the generated magnetic pole distribution information (image information), FIG. 9 shows the result after 60 hours when the bearing assembly is misaligned.
As shown in the figure, when the bearing assembly is misaligned, edge load occurs on the non-running side of the raceway surface and the outside of the raceway surface as compared with the case where the bearing assembly is normal, which is comparative information. It can be seen that the magnetic poles are biased. That is, in bearing assembly, when misalignment occurs, the magnetic poles are biased in the width direction of the raceway surface (the magnetic poles are biased from the N pole on the outside of the raceway surface, and the magnetic poles are biased from the S pole on the non-traveling surface side. Bias, or vice versa.).

Here, as shown in FIG. 6B, at the time of misalignment, the edge of the rolling element strongly contacts the raceway surface on the non-running surface side of the raceway surface, so that intense stress concentration occurs. On the other hand, on the outside of the raceway surface, stress concentration does not occur because the edge of the rolling element does not contact (or weakly contact) the raceway surface. As a result, bias of the magnetic poles is observed between the non-running side of the raceway surface and the outside of the raceway surface, and the edges on both sides of the rolling element are in strong contact with the raceway surface, so that it can be seen that the magnetic poles are changing in the axial direction.

Next, as an example of the generated magnetic pole distribution information (image information), FIG. 10 shows the result after 24 hours at the time of wear occurrence.
As shown in the figure, it can be seen that when wear occurs, the magnetic poles of the entire raceway surface change as compared with the case where the bearing assembly is normal, which is comparative information. When wear occurs on the raceway surface of the bearing, a large bias occurs on the entire raceway surface. That is, during wear, stress is concentrated on the track surface of the load zone and a structural change occurs, so that a large bias of magnetic poles is observed over the entire track surface over multiple rows as compared with the normal state.

When an excessive load is applied to the raceway surface, the retained austenite on the raceway surface is decomposed, and the strain of martensite is also reduced. Here, the retained austenite is a non-magnetic phase, and the strain of martensite affects the mobility of the domain wall. Further, when the rolling element repeatedly passes through the raceway surface, a tensile or compressive force is repeatedly applied to the raceway surface to change the magnetism (reverse magnetostrictive effect). In particular, it is considered that a large amount of magnetostriction is accumulated in the load zone because the rolling element passes through a certain place on the outer ring raceway surface when the inner ring is rotating.
As described above, in the case of the bearing abnormality diagnosis system and the bearing abnormality diagnosis method according to the present invention, the degree of abnormality progress having a causal relationship between the generated magnetic pole distribution information (image information) and the magnetic pole distribution information. Based on the comparison with the comparative information, it is possible to diagnose the presence or absence of an abnormality in the magnetic field measurement surface and the degree of its progress.

Therefore, in the case of the bearing abnormality diagnosis system and the bearing abnormality diagnosis method according to the present invention, the presence or absence of an abnormality in the rolling bearing and the degree of its progress can be checked at the time of maintenance without cutting the bearing as in the conventional diagnosis method. It can be grasped in advance in a non-disassembled state. As a result, the bearing can be replaced at the time of maintenance under appropriate judgment. Therefore, it is possible to prevent the production machine from unexpectedly stopping due to the peeling of the magnetic field measurement surface during the operation of the production machine. In addition, it is possible to prevent the manufactured product from being damaged by flakes.

The method for diagnosing an abnormality of a bearing according to the present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the present invention.
For example, in the above embodiment, as a measurement example of the magnetic field measurement surface, an example in which the raceway surface 22 m of the bearing 20 is measured from the inner peripheral surface side has been described, but the present invention is not limited to this, and the present invention is limited to the magnetic field measurement surface. If the magnetic field distribution information of the N pole and the S pole of the magnetic field can be acquired, another magnetic field measurement surface (that is, the raceway surface of the inner ring 21 and / or the rolling surface around the roller 23) can be measured. Of course.
For example, as shown in a schematic diagram as a modified example (another embodiment) in FIG. 11, the raceway surface 22 m of the bearing 20 can be measured from the side of the outer peripheral surface. Such measurement is suitable for providing a bearing abnormality diagnosis method and a bearing abnormality diagnosis system capable of diagnosing the presence or absence of bearing abnormality before disassembling the bearing.

Further, for example, in the above embodiment, as an example of the first identification information and the second identification information of the magnetic pole distribution information, the two first identification information are information (red and blue) of colors having different hues from each other. The second identification information displays the lightness or saturation of the color in multiple stages according to the magnitude of the magnetic field of each measured value for each of the information (red and blue) of colors having different hues from each other (red and blue). An example of image information to be shaded) is shown, but the present invention is not limited to this.
That is, as the magnetic pole distribution information generated in the present invention, two different magnetic pole measurement values are displayed so as to be distinguishable from each other according to the magnetic pole properties of the north pole and the south pole of the magnetic field. Various modes shall be used as long as it is a combination of the first identification information and the second identification information set so that each stage can be identified step by step according to the magnitude of the magnetic field of each measured value. Can be done.

For example, the embodiment "itself" shown in FIGS. 7 to 10 can be used. That is, the two first identification information is the information of the different magnetic pole symbols S and N, and the second identification information is the information of the different magnetic pole symbols according to the magnitude of the magnetic field of each measured value. The lightness or saturation of the magnetic pole symbol or the portion displaying the background thereof can be divided into a plurality of stages and displayed.
Further, when colors are used, it is of course not limited to blue and red, and various colors can be combined. Further, it is preferable to use S and N as the magnetic pole symbols, but the present invention is not limited to this, and various symbols can be associated with each other as long as they are different magnetic pole symbols.

Further, for example, in the above embodiment, a self-aligning roller bearing is taken as an example of the bearing, and further, in the embodiment, an example in which both the non-running surface on which the oil holes are arranged and the raceway surface are measured from the inner peripheral surface side is shown. However, the present invention is not limited to this, and for example, only the raceway surface may be measured, and of course, the bearing can be measured from the outer peripheral surface side in a non-disassembled state. Further, the method for diagnosing an abnormality of a bearing according to the present invention is not limited to rolling bearings, but is suitable for various bearings using rollers as rolling elements. For example, in addition to self-aligning roller bearings, it is suitable for abnormal diagnosis of bearings such as tapered roller bearings and cylindrical roller bearings.

1 Magnetic sensing part 2 Probe 3 Processing part 4 Output part 5 Main body part 6 Signal line 7 Information processing device 10 Teslamometer (magnetic field measuring instrument)
20 Self-aligning roller bearing (bearing)
21 Inner ring (orbital ring)
22 Outer ring (orbital ring)
Orbital plane of 22m outer ring (magnetic field measurement plane)
Around 23 (rolling body)

Claims (9)

A roller bearing comprising a steel inner ring having a magnetic field measuring surface on the outer peripheral surface, a steel outer ring having a magnetic field measuring surface on the inner peripheral surface, and a plurality of rollers interposed between the inner ring and the outer ring. It is a method of diagnosing the state of misalignment.
The measurement step of measuring the magnetic fields at a plurality of measurement positions with respect to the magnetic field measurement surface of the roller bearing, and the measurement step.
An information generation step of generating magnetic field distribution information of the north pole and the south pole of the magnetic field on the magnetic field measurement surface measured in the measurement step, and
Based on the magnetic pole distribution information generated in the information generation step, a diagnostic step of diagnosing the state of misalignment from the degree of deviation of the magnetic poles in the width direction of the raceway surface of the roller bearing, and a diagnostic step.
A method for diagnosing bearing abnormalities, which comprises.
However, the "magnetic field measurement surface" means a raceway surface to be measured by the roller bearing . In the information generation step, the magnetic pole distribution information is divided into two different first identification information that discriminate each measured value of a magnetic field at a plurality of points according to the magnetic pole properties of the north pole and the south pole of the magnetic field. , Generated as image information by combining with the second identification information that can identify each stage step by step according to the magnitude of the magnetic field of each measurement position.
The method for diagnosing an abnormality in a bearing according to claim 1, wherein the diagnostic step diagnoses a state of misalignment of the roller bearing based on the generated image information. The two first identification information is information on colors having different hues from each other.
The second identification information is information for displaying the lightness or saturation of colors in a plurality of stages according to the magnitude of the magnetic field of each measurement position for each of the information of colors having different hues from each other. The method for diagnosing an abnormality in a bearing according to claim 2. The two first identification information is information on magnetic pole symbols that are different from each other.
The second identification information has a plurality of stages of brightness or saturation of the magnetic pole symbol and / or the portion displaying the background thereof according to the magnitude of the magnetic field of each measurement position for each of the information of the symbols different from each other. The method for diagnosing an abnormality in a bearing according to claim 2, which is information to be displayed separately in. Based on the comparison between the generated magnetic field distribution information and the comparison information of the abnormal progress degree having a causal relationship with the magnetic pole distribution information, the misalignment is determined from the presence or absence of the abnormality on the magnetic field measurement surface and the progress degree. The method for diagnosing a bearing abnormality according to any one of claims 1 to 4 for diagnosing a condition . The generated magnetic pole distribution information is based on the load zone measurement value obtained by measuring the state of the magnetic field on the magnetic field measurement surface in the load zone of the roller bearing .
The bearing abnormality according to claim 5, wherein the comparison information of the degree of abnormal progress is magnetic field distribution information when the presence or absence of an abnormality in the magnetic field measurement surface of the corresponding roller bearing and the degree of the degree of progress are acquired in advance by an experiment. Diagnostic method. The generated magnetic pole distribution information is based on the load zone measurement value obtained by measuring the state of the magnetic field on the magnetic field measurement surface in the load zone of the roller bearing .
The bearing abnormality diagnosis according to claim 5, wherein the comparative information of the degree of abnormality is magnetic pole distribution information based on the non-load zone measurement value obtained by measuring the state of the magnetic field on the magnetic field measurement surface in the non-load zone of the roller bearing. Method. A bearing abnormality diagnosis system for executing the bearing abnormality diagnosis method according to any one of claims 1 to 7 using an information processing device including a computer.
A magnetic field information acquisition step for acquiring information on magnetic fields at a plurality of measurement positions in the roller bearing measured by a magnetic field measuring instrument, and a magnetic field information acquisition step.
Each measured value of the magnetic field at a plurality of measurement positions on the magnetic field measurement surface acquired in the magnetic field information acquisition step is generated as the magnetic field property distribution information according to the magnetic field properties of the N pole and the S pole and their strength. Information generation step and
A diagnostic step for diagnosing a misalignment state based on the presence or absence of an abnormality in the roller bearing and the degree of progress thereof based on the magnetic pole distribution information generated in the information generation step.
Bearing abnormality diagnostic system characterized by including. The magnetic field information acquisition step acquires the measured value of the magnetic field on the magnetic field measuring surface at least in the load zone of the roller bearing .
In the information generation step, the magnetic pole distribution information is obtained, and the measured value of the magnetic field in the load zone is the image information including the color and the shade corresponding to the magnetic pole property between the N pole and the S pole and the distribution state of the magnitude thereof. Generated so that it can be displayed
In the diagnostic step, the presence or absence of an abnormality in the roller bearing is determined based on the distribution of color shades of the generated image information and the comparative information of the degree of abnormality progress associated with the image information in comparison. The bearing abnormality diagnosis system according to claim 8 , wherein a state of misalignment is diagnosed based on the degree of progress.

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