JP2016197062A - General-purpose deterioration curve creation method, machine life predication method, general-purpose deterioration curve creation program, and machine life prediction program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a general-purpose deterioration curve creation method for evaluating the deterioration state of a rotary machine on the basis of the measurement of wear particles in lubricating oil and a machine life prediction method for predicting the remaining life of the rotary machine by using the general-purpose deterioration curve creation method.SOLUTION: A genera-purpose deterioration curve creation method for evaluating the deterioration state of a rotary machine having a bearing to be operated in lubricating oil includes: a drive step of rotating a shaft body by using a test machine 1 comprising a shaft body 3 and a bearing 2 for rotating the shaft body in lubricating oil 4 by applying a load L; a measurement step of measuring the number of wear particles in the lubricating oil, and calculating a deterioration state value based on the number of the wear particles; a deterioration state value collection step of repeatedly measuring the number of wear particles, and collecting the deterioration state values of each time; and a general-purpose curve creation step of creating a change in the collected deterioration state values as a general-purpose deterioration curve.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a general-purpose deterioration curve creation method and program for evaluating the deterioration state of a rotating machine equipped with a bearing operated in lubricating oil, and a machine life prediction method for predicting the remaining life of a rotating machine based on the general-purpose deterioration curve and Regarding the program.

Conventionally, the main equipment used in power plants and factories requires advanced and optimized maintenance methods in order to ensure the safety and reliability of equipment with aging and to reduce maintenance costs. It has been. Among major facilities, for example, rotating machinery used for power generation directly affects the power generation output, so ensuring soundness is important. For this reason, state monitoring is performed using various equipment diagnostic methods, but there are currently no effective methods other than the management by the vibration method in the diagnostic technology for evaluating the soundness of rotating machinery.
Under such circumstances, in recent years, a diagnostic method utilizing tribology (friction / wear engineering) (hereinafter referred to as “tribo diagnosis”) has been performed as one of the effective diagnosis methods for mechanical equipment. Since many deteriorations and failures of machinery and equipment are caused by seizure and wear, precise diagnosis that can comprehensively diagnose the soundness of machinery and equipment by analyzing the properties of wear particles and lubricating oil in the lubricating oil Is the law.
A known particle counting method or a particle counting device (also referred to as “particle counter”) can be used for such a precise diagnosis based on the properties of the lubricating oil of the machine. For example, the particle counter described in Patent Document 1 identifies the shape, size, etc. of particles in a liquid (lubricating oil) by measuring blocking light and scattered light when irradiated with light and particles. Is counted.

JP2015-31665A

Conventionally, since it takes a long time to perform precise tribo diagnosis on facilities such as rotating machines, there has been a problem that continuous monitoring is difficult. Further, in order to analyze and evaluate the lubricating oil collected from the mechanical equipment, there is a problem that a high level of knowledge of a skilled worker is required and the diagnostic cost is high.
On the other hand, if a particle counter as described in Patent Document 1 is applied, the number of particles (number of wear particles) in the lubricating oil can be continuously measured online. However, conventionally, a method for evaluating the deterioration state of a rotating machine by measuring wear particles in the lubricating oil has not been established.
Therefore, if the correlation between the increasing tendency of the wear particles in the lubricating oil and the deterioration state of the rotating machine is clarified and can be widely applied to the rotating machine, a primary diagnosis of the deterioration state of the rotating machine can be performed. The primary diagnosis makes it possible to detect unexpected troubles in the rotating machine at an early stage, and it is possible to screen whether a precise tribo diagnosis is necessary. Furthermore, ensuring the safety and reliability of rotating machines, optimizing maintenance methods, and reducing maintenance costs are expected.

  The present invention has been made in view of the above situation, and a general-purpose deterioration curve creation method and program for creating a general-purpose deterioration curve for evaluating the deterioration state of a rotating machine based on the measurement of wear particles in lubricating oil, Another object of the present invention is to provide a machine life prediction method and program for predicting the life of a rotating machine based on the general-purpose deterioration curve.

The present invention is as follows.
1. A general-purpose deterioration curve creation method for evaluating a deterioration state of a rotary machine including a bearing operated in a lubricating oil, comprising a shaft body and a bearing made of the same material as the rotary machine, and applying a predetermined load to the bearing And using a test machine that rotates the shaft body in lubricating oil, measuring the number of wear particles in the lubricating oil, a driving step of rotating the shaft body of the test machine at a predetermined rotation speed, A measurement step for calculating a deterioration state value based on the number of wear particles, and after starting the rotation of the shaft body by the driving step, the wear particle number is repeatedly measured by the measurement step, and the deterioration state value of each time is calculated. Degradation state value collection step to collect, and the deterioration state value for the elapsed time from when the deterioration state value collected by the deterioration state value collection step becomes equal to or greater than a first value until becoming a second value A general-purpose deterioration curve creating step of creating a general-purpose deterioration curve as a general-purpose deterioration curve, wherein the general-purpose deterioration curve is timelessly quantified based on the elapsed time, and the deterioration state value is the first value and the A general-purpose deterioration curve creation method, characterized in that it is dimensionlessly quantified based on a second value.
2. The deterioration state value is one of the number of the wear particles per unit oil amount, the increase number per unit time, and the increase rate thereof. General purpose deterioration curve creation method described.
3. The bearing of the rotating machine is a plain bearing. Or 2. General-purpose deterioration curve creation method described in 1.
4). The bearing of the rotary machine is a rolling bearing. Or 2. General-purpose deterioration curve creation method described in 1.
5. 1 above. To 4. A machine life prediction method for predicting the remaining life of a rotating machine using the general-purpose deterioration curve created by the general-purpose deterioration curve creating method according to any one of the above, and in a lubricating oil of a bearing provided in the rotating machine The actual machine measurement step of measuring the number of wear particles and calculating the deterioration state value based on the number of wear particles and the actual machine measurement step are performed twice or more, and the deterioration state value calculated each time is used as the general-purpose deterioration curve. A machine life prediction method comprising: a life calculation step of calculating a time until the deterioration state value reaches a predetermined value as a remaining life by making it correspond.
6). The deterioration state value is one of the number of the wear particles per unit oil amount, the increase number per unit time, and the increase rate thereof. The machine life prediction method described.
7). The bearing of the rotating machine is a slide bearing. Or 6. The machine life prediction method described in 1.
8). The bearing of the rotating machine is a rolling bearing. Or 6. The machine life prediction method described in 1.
9. A general-purpose deterioration curve creation program for evaluating a deterioration state of a rotating machine having a bearing operated in lubricating oil, comprising a shaft body and a bearing made of the same material as the rotating machine, and applying a predetermined load to the bearing A measuring function for measuring the number of wear particles in the lubricating oil and calculating a deterioration state value based on the number of wear particles, After the rotation is started, the wear particle number is repeatedly measured by the measurement function, and the deterioration state value collecting function for collecting the deterioration state value each time and the deterioration state value collected by the deterioration state value collecting function A general-purpose deterioration curve creating function for creating a general-purpose deterioration curve as a general-purpose deterioration curve for the change of the deterioration state value with respect to the elapsed time from when the value becomes equal to or greater than the first value to the second value, and the general-purpose deterioration The line is dimensionlessly quantified based on the elapsed time, and the degradation state value is dimensionlessly quantified based on the first value and the second value. program.
10. The deterioration state value is one of the number of the wear particles per unit oil amount, the increase number per unit time, and the increase rate thereof. General purpose deterioration curve creation program.
11. The bearing of the rotating machine is a plain bearing. Or 10. General purpose deterioration curve creation program described in 1.
12 The bearing of the rotary machine is a rolling bearing. Or 10. General purpose deterioration curve creation program described in 1.
13. 1 above. To 4. A machine life prediction program for predicting the remaining life of a rotating machine using the general-purpose deterioration curve created by the general-purpose deterioration curve creating method according to any one of the above, and in a lubricating oil of a bearing provided in the rotating machine The actual machine measurement function that measures the number of wear particles and calculates the deterioration state value based on the wear particle number and the measurement by the actual machine measurement function are performed twice or more, and the deterioration state value calculated each time is used as the general purpose A machine life prediction program for causing a computer to realize a life calculation function for calculating a time until the deterioration state value reaches a predetermined value as a remaining life by making it correspond to a deterioration curve.
14 The deterioration state value is one of the number of the wear particles per unit oil amount, the increase number per unit time, and the increase rate thereof. The machine life prediction program described.
15. The bearing of the rotating machine is a slide bearing. Or 14. Machine life prediction program described in 1.
18. The bearing of the rotating machine is a rolling bearing. Or 14. Machine life prediction program described in 1.

According to the method for creating a general-purpose deterioration curve of the present invention, a test machine that includes a shaft body and a bearing, applies a predetermined load to the bearing, and rotates the shaft body in the lubricating oil is used. A driving step for rotating, a measuring step for measuring the number of wear particles in the lubricating oil, and calculating a deterioration state value based on the number of wear particles, and repeatedly measuring the number of wear particles by the measurement step, and a deterioration state value for each time A deterioration state value collection step for collecting the deterioration state value and a general purpose deterioration curve for a change in deterioration state value with respect to an elapsed time from when the collected deterioration state value becomes equal to or higher than the first value until the second value is reached. A deterioration curve generation step, so that it is possible to continuously measure the number of wear particles in the lubricating oil online, and the temporal change in the deterioration state value calculated based on the measured number of wear particles The It is possible to create as use deterioration curve. Since the general-purpose deterioration curve corresponds to the deterioration state of the bearing, it can be used as an index for evaluating the deterioration state of the rotating machine. The general-purpose deterioration curve is dimensionless in the time axis and dimensionless in the deterioration state value, so there are differences in operating conditions for each rotating machine, bearing size, lubricating oil amount, etc. It can be applied to the evaluation of the deterioration state.
By this general-purpose deterioration curve creation method, a general-purpose deterioration curve can be created in an extremely short time. The general-purpose deterioration curve can be used as an index for diagnosing the deterioration state of the rotating machine that actually operates under various conditions, and the deterioration state of the rotating machine can be managed in an integrated manner. In addition, the diagnosis using the general-purpose deterioration curve makes it possible to detect an unexpected trouble of the rotating machine in operation at an early stage, and to screen whether a precise tribo diagnosis is necessary. Furthermore, the safety and reliability of the rotating machine can be ensured, the maintenance method can be optimized, and the maintenance cost can be reduced.

When the deterioration state value is one of the number of wear particles per unit oil amount, the increase number per unit time, and the increase rate, the deterioration state value can be easily calculated. It is possible to appropriately select an index for evaluating the deterioration state of the bearing.
When the bearing of the rotating machine is a slide bearing, the wear deterioration state of the slide bearing can be evaluated by a general-purpose deterioration curve.
When the bearing of the rotating machine is a rolling bearing, the fatigue deterioration state of the rolling bearing can be evaluated by a general-purpose deterioration curve.

According to the mechanical life prediction method of the present invention, a mechanical life prediction method for predicting the remaining life of a rotating machine using the general-purpose deterioration curve created by the general-purpose deterioration curve creating method, the bearing provided in the rotating machine The actual machine measurement step for measuring the number of wear particles in the lubricating oil and calculating the deterioration state value based on the number of wear particles and the actual machine measurement step are performed twice or more, and the deterioration state value calculated each time is general-purpose deterioration. By measuring the number of wear particles in the lubricating oil of the bearing and monitoring the change, the life calculation step for calculating the time until the deterioration state value reaches a predetermined value as the life is provided. In addition, the deterioration state of the rotating machine that actually operates can be evaluated by checking the general-purpose deterioration curve. Then, the time until the bearing of the rotating machine reaches the use limit can be calculated as the remaining life of the rotating machine.
When the deterioration state value is one of the number of the wear particles per unit oil amount, the increase number per unit time, and the increase rate thereof, the deterioration state value is measured in a rotating machine that actually operates. The deterioration state value can be easily calculated from the number of wear particles, and an index for calculating the actual remaining life of the bearing can be appropriately selected.
When the bearing of the rotating machine is a slide bearing, the wear deterioration state of the actually operating slide bearing can be evaluated by a general-purpose deterioration curve, and the remaining life can be calculated.
When the bearing of the rotating machine is a rolling bearing, it is possible to evaluate the fatigue deterioration state of the actually operating rolling bearing by a general-purpose deterioration curve and to calculate the remaining life.

According to the general-purpose deterioration curve creation program of the present invention, a function suitable for performing the general-purpose deterioration curve creation method can be realized on a computer.
According to the machine life prediction program of the present invention, a function suitable for performing the machine life prediction method can be realized on a computer.

It is a block diagram which shows the structure of the testing machine for producing a general purpose deterioration curve. It is a figure which shows notionally the time-dependent change of the friction coefficient in a slide bearing. It is a graph which shows the result of having measured a friction coefficient, the number of wear particles, and the wear particle increase rate simultaneously. It is a graph which shows the change of the wear particle increase rate with respect to the time made dimensionless. It is a figure which shows the structure of a general purpose deterioration curve creation program. It is a graph for demonstrating the calculation method of a remaining life. It is an example of calculation of remaining life. It is a figure which shows the structure of a machine life prediction program. It is a figure which shows the specific structure of the testing machine which makes a slide bearing object. It is a graph which shows the acceleration test result of a slide bearing. It is a graph which shows the relationship between the friction coefficient of a slide bearing, and a wear particle increase rate. It is a graph which shows the general purpose deterioration curve created by the acceleration test of the slide bearing. It is a graph which shows the change of the number of wear particles in an actual machine provided with a slide bearing. It is a graph which shows the wear particle increase rate calculated | required from the previous figure, and a general purpose deterioration curve. It is a figure which shows the specific structure of the testing machine which makes a rolling bearing object. It is a graph which shows the result (the number of wear particles) of the acceleration test of a rolling bearing. It is a graph which shows the result (wear particle increase rate) of the acceleration test of a rolling bearing. It is a graph which shows the general purpose deterioration curve created by the acceleration test of the rolling bearing. It is a graph which shows the wear particle increase rate of another rolling bearing, and a general purpose deterioration curve.

1. General-purpose deterioration curve creation method and general-purpose deterioration curve creation program The general-purpose deterioration curve creation method according to the present embodiment creates a general-purpose deterioration curve for evaluating the deterioration state of a rotating machine (actual machine) having a bearing operated in lubricating oil. Therefore, the shaft body (3) and the bearing (2) made of the same material as the rotary machine are provided, and a predetermined load (L) is applied to the bearing (2) so that the shaft body (3) is placed in the lubricating oil (4). Using the rotating testing machine (1), the number of wear particles in the lubricating oil (4) is measured.

FIG. 1 is a diagram schematically showing the configuration of the testing machine 1 (1A, 1B). FIG. 1A shows a testing machine 1A that performs a friction test on a sliding bearing. This example is a so-called block-on-disk type testing machine that performs a test by bringing a disk-shaped test shaft 3A into contact with a test bearing 2A having a rectangular cross section. The test bearing 2A corresponds to a bearing of a rotating machine, and the test shaft body 3A corresponds to a shaft body of the rotating machine. The test bearing 2 </ b> A is fixed on the base 9, and at least the contact surface between the test bearing 2 </ b> A and the test shaft body 3 </ b> A is immersed in the lubricating oil 4.
The test shaft body 3A rotates at a set arbitrary number of rotations (for example, 0 to 1800 rpm), and an arbitrary load L is applied to the contact surface between the test bearing 2A and the test shaft body 3A. The magnitude | size and direction of the load L are not specifically limited. In this example, a radial load L (for example, 0 to 1000 N) of an arbitrary size is applied in a direction perpendicular to the rotation axis.

FIG. 2B shows a testing machine 1B that performs a fatigue test on a rolling bearing. In the testing machine 1B of this example, a housing 92 divided into upper and lower parts is installed on a base 9, and a test bearing (rolling bearing) 2B is sandwiched and fixed between two upper and lower housings 92. The test shaft 3B is rotated by being supported by the test bearing 2B. Lubricating oil 4 is injected at least between the inner and outer rings of the test bearing 2B.
The test shaft 3B rotates at a set arbitrary number of rotations (for example, 0 to 1800 rpm), and an arbitrary load L is applied to the test bearing 2B. The magnitude | size and direction of the load L are not specifically limited. In this example, a radial load L (for example, 0 to 22 kN) of an arbitrary size is applied downward through the upper housing 92. A thrust load acting in the direction of the rotation axis may be applied as the load.
In either case of the slide bearing or the rolling bearing, an accelerated test for deterioration of the bearing can be performed by setting the number of rotations and the load.

  The lubricating oil 4 flows and the number of wear particles in the lubricating oil 4 regardless of whether the bearing is a sliding bearing as shown in FIG. 1A or a rolling bearing as shown in FIG. Is measured by the wear particle measuring device 5. Measurement of the number of wear particles by the wear particle measuring device 5 can be performed by a known method (for example, Patent Document 1).

  In this general-purpose deterioration curve creation method, the test shaft body 3 (3A, 3B) supported by the test bearing 2 (2A, 2B) is rotated using the testing machine 1 (1A, 1B). The number of wear particles is measured, and based on the measured number of wear particles, a deterioration state value serving as an index for evaluating the deterioration state of the bearing 2 is calculated, and a general-purpose deterioration curve ( It is configured to create a deterioration master curve). For this reason, the general-purpose deterioration curve creating method includes a driving step, a measurement step, a deterioration state value collecting step, and a general-purpose deterioration curve creating step.

  In the driving step, the test shaft 3 is rotated at a predetermined timing and the number of rotations in a state where a predetermined load L is applied to the test bearing 2. Rotating the test shaft 3 includes starting the rotation of the test shaft 3, maintaining or changing the number of rotations, and stopping the rotation.

In the measurement step, the number of wear particles in the lubricating oil 4 is measured using the wear particle measuring device 5, and the deterioration state value is calculated based on the number of wear particles. The deterioration state value does not matter as long as it has a correlation with the deterioration degree of the bearing and serves as an index for evaluating the deterioration state. For example, as the deterioration state value, the number of wear particles, the number of wear particles per unit oil amount, the number of wear particles increased per unit time, the wear particle increase rate per unit time (hereinafter referred to as “wear particle increase rate ΔPC”, etc.) Etc.).
In the measurement step, the load L applied to the test bearing 2 can be measured using a load cell or the like (not shown). Moreover, each part temperature etc. can be measured as needed.

  In the deterioration state value collecting step, after the rotation of the test shaft body 3 is started by the driving step, the measurement step is repeatedly performed to measure the number of wear particles, and the deterioration state value of each time is collected. The cycle for performing repeated measurement (sampling cycle) can be arbitrary as long as a general-purpose degradation curve can be created from the collected degradation state value changes.

In the general-purpose deterioration curve creation step, a change in the deterioration state value with respect to the elapsed time from when the deterioration state value collected in the deterioration state value collecting step becomes equal to or higher than the first value to the second value is Create as a deterioration curve. That is, the time point when the deterioration state value becomes equal to or higher than the first value can be set as the start point of the general-purpose deterioration curve, and the time point when the deterioration state value becomes the second value can be set as the end point of the general-purpose deterioration curve.
The first value can be appropriately set according to the deterioration process of the bearing, and can be, for example, a value of a deterioration state value at a time point at which it can be determined that the deterioration of the bearing has started to progress. Further, the second value can also be set as appropriate depending on the deterioration process of the bearing, and can be, for example, the value of the deterioration state value immediately before the bearing fails. More specifically, the first value and the second value will be described in an example of a slide bearing and a rolling bearing described later.

  The general-purpose deterioration curve has a dimensionless dimension on the basis of the elapsed time. That is, it can be converted into dimensionless time so that the start point of the general-purpose deterioration curve is “0” and the end point is “1”. Further, the degradation state value is dimensionlessly quantified based on the first value and the second value. That is, the deterioration state value can be converted so that the value of the start point of the general-purpose deterioration curve is “0” and the value of the end point is “1”.

  When the bearing is a plain bearing, the cause of the deterioration is wear caused mainly by friction between the shaft body and the bearing. On the other hand, in the case of a rolling bearing, the cause of deterioration is mainly bearing fatigue. This general-purpose deterioration curve creation method can be applied regardless of whether the object is a plain bearing or a rolling bearing. In the following, a general-purpose deterioration curve creation method will be described in detail by taking a plain bearing as an example.

The degree of damage and deterioration of the sliding bearing, that is, the degree of progress of wear can be evaluated based on the coefficient of friction between the shaft body 3A and the bearing 2A.
FIG. 2 is a diagram conceptually showing the change with time of the friction coefficient μ in the slide bearing. The change with time of the friction coefficient μ can be rephrased as the change with time of the lubrication state. For example, the friction coefficient increases due to a sudden change in the lubrication state. In contrast, when the lubrication state changes gradually, the friction coefficient also changes gradually. However, it is considered that the lubrication state is not uniquely determined with respect to the actual elapsed time t but is determined by the progress process of wear. That is, the lubrication state that changes with the change in the friction coefficient is affected by the change in the rotational speed and the like.

FIG. 2A shows that the speed of change of the friction coefficient μ varies depending on the speed of change (ΔR) of the rotational speed R. When the change speed of the rotational speed is fast (ΔR ₁ ), the friction coefficient μ _max reaches a constant at time t ₁ . In contrast, when the change speed of the rotation speed is slow (ΔR _n ), the time t ₃ to reach the friction coefficient μ _max is longer than t ₁ . Here, it is found that even if the change speed ΔR of the rotational speed is different, the curves until the value of the friction coefficient μ reaches from μ _min to μ _max are similar. Therefore, the change of the friction coefficient μ (the lubrication state) with respect to the time t can be summarized as one deterioration curve. 2 (b) is a time when the value of the friction coefficient mu becomes mu _min 0, for mu _max become time dimensionless time as 1 T, illustrates a variation of the friction coefficient mu. If the time axis is converted in this way, the change in the friction coefficient μ can be represented by one curve regardless of the change speed ΔR of the rotational speed. Hereinafter, the curve representing the change in the lubrication state with respect to the dimensionless time T as shown in FIG. 2B is referred to as a “general-purpose deterioration curve”.

  As described above, the time transition of the friction coefficient can be uniquely expressed by making the time axis dimensionless regardless of the process of the change. Further, it can be considered that the change of the friction coefficient with respect to time is represented by an exponential function. This is because the rate of increase in the friction coefficient μ increases as the deterioration (wear) progresses. This is also considered appropriate from the experience that the friction part of the machine is seized rapidly. Therefore, the friction coefficient μ and the deterioration (wear) are correlated, and it can be said that the value increases rapidly as the value of the friction coefficient μ increases.

Next, the correlation between the friction coefficient μ, the number of wear particles (PC), and the rate of increase in the number of wear particles (ΔPC) is examined. FIG. 3 shows the results of simultaneously measuring the friction coefficient μ, the number of wear particles PC, and the wear particle increase rate ΔPC. In a certain lubricating region, a certain friction coefficient μ is developed, and the friction coefficient μ is maintained. FIG. 4A shows the change of the friction coefficient μ with respect to time t in each lubrication region where the friction coefficient μ having a constant value (μ ₁ , μ ₂ , μ ₃ ) appears. FIG. 4B shows the change in the number of wear particles PC in each lubrication region where the friction coefficient μ is the constant value. FIG. 4C shows a change in the wear particle increase rate ΔPC (that is, the slope of FIG. 5B) in each lubrication region where the friction coefficient μ becomes the constant value.

From FIG (c), the friction coefficient mu is a constant value _{(μ 1, μ 2, μ} 3) at the time t _a to reach and extract the value of the coefficient of friction mu and wear particles increase Delta] PC, Fig. (D ) Is obtained. That is, it can be seen that the wear particle increase rate ΔPC is proportional to the friction coefficient μ. Therefore, the general-purpose deterioration curve based on the friction coefficient μ shown in FIG. 2B can be converted into a curve showing the change in the wear particle increase rate ΔPC with respect to the dimensionless time T.

The change in the wear particle increase rate ΔPC with respect to the dimensionless time T becomes a general-purpose deterioration curve as shown in FIG. The coefficient of friction is an index representing the lubrication state of the slide bearing, but it is extremely difficult to measure the coefficient of friction with an actual machine. However, the number of wear particles generated in the lubricating oil can be measured. Therefore, based on the measured number of wear particles, the deterioration state value can be calculated as a new index representing the lubrication state of the bearing. As the deterioration state value, the wear particle increase rate ΔPC calculated from the wear particle number PC measured every moment can be used. Then, the general-purpose deterioration curve can be represented by an exponential function (ΔPC _T = ae ^bT + c, where a, b, and c are arbitrary constants).
In addition, as shown in FIG. 3, a certain correlation is also found between the friction coefficient μ and the number of wear particles PC. Therefore, by using an appropriate conversion means, it is possible to use the number of wear particles PC or the increase number per unit time as a deterioration state value, and to express a general-purpose deterioration curve based on the deterioration state value.

In a sliding bearing, the quality of the lubrication state is determined by the state of oil film formation, and the friction coefficient is determined by the sliding speed, the kinematic viscosity of the oil, and the load. Generally, the lubrication state is divided into the following three states.
(I) Fluid lubrication: A lubrication state in which a sufficiently thick lubrication film is formed and the two metal surfaces in contact with the lubrication film are completely separated.
(Ii) Mixed lubrication: Lubrication region where boundary lubrication and fluid lubrication are mixed.
(Iii) Boundary lubrication: A lubrication state in which an oil film is not sufficiently formed and contact between two metal surfaces occurs.

As shown in FIG. 4, the general-purpose deterioration curve indicates that the deterioration state value collected by the deterioration state value collecting step is not less than the first value (for example, ΔPC _min ) and the second value (for example, ΔPC _min ). , ΔPC _max ). In addition, as described above, the time from when the first value is reached to when the second value is reached is dimensionless. Furthermore, the degradation state value can be made dimensionless based on the first value and the second value.
The first value of the deterioration state value may be a value at which the bearing lubrication state is an initial value of the mixed lubrication (for example, a deterioration state value corresponding to a state where the friction coefficient μ is 0.02).
Further, the second value of the deterioration state value may be a value that becomes a use limit of the bearing. For example, the lubrication state of the friction surface can be a value immediately before the boundary lubrication (for example, a deterioration state value corresponding to a state where the friction coefficient μ is 0.08).

Each step of the general-purpose deterioration curve creating method described above can be generally executed using a computer. That is, a general-purpose deterioration curve creation program for performing the general-purpose deterioration curve creation method on a computer can be realized.
FIG. 5 shows a configuration example of the general-purpose deterioration curve creation program. The general-purpose deterioration curve creation program is a general-purpose deterioration curve creation program for evaluating the deterioration state of a rotating machine including a bearing operated in lubricating oil, and includes a shaft 3 and a bearing 2 made of the same material as the rotating machine. A test machine 1 that applies a predetermined load to the bearing 2 and rotates the shaft 3 in the lubricating oil 4, measures the number of wear particles in the lubricating oil 4, and indicates a deterioration state value based on the number of wear particles A measurement function 64 for calculating the degradation state value, a degradation state value collection function 66 for collecting the degradation state value at each time by causing the repeated measurement function 64 to measure the number of wear particles after the rotation of the shaft body 3 is started, and a degradation state value A general-purpose deterioration curve creation function 68 that creates a change in the deterioration state value with respect to the elapsed time from when the deterioration state value collected by the collection function 66 becomes equal to or higher than the first value to the second value as a general-purpose deterioration curve; The computer To realize to 6.

The storage device 60 provided in the computer 6 accumulates and stores the measured number of wear particles, the calculated deterioration state value, and the like, and stores the data constituting the created general-purpose deterioration curve. it can.
Further, the general-purpose deterioration curve creation program can be provided with a drive function 62 for rotating the shaft body 3 of the testing machine 1 at a predetermined rotational speed.
Each of the functions need not be provided on one computer 6, and the computer 6 may be configured to include a programmable controller, a data logger, and the like as appropriate.

2. Machine Life Prediction Method and Machine Life Prediction Program By using the general-purpose deterioration curve described above, it is possible to diagnose the deterioration state of a rotating machine (actual machine) that is actually operating and predict its remaining life. .
This machine life prediction method is a machine life prediction method for predicting the life of a rotating machine using the general-purpose deterioration curve created by the general-purpose deterioration curve creating method, and is a bearing (2x) provided in the rotating machine (1x). ), The actual machine measurement step of calculating the deterioration state value (for example, ΔPC) based on the wear particle number (PC) and the actual machine measurement step are performed twice or more. A life calculation step for calculating the time until the deterioration state value reaches a predetermined value as a life by associating the deterioration state value calculated each time with the general-purpose deterioration curve.
The predetermined value of the deterioration state value may be a value of the end point of the general-purpose deterioration curve (for example, the ΔPC _max ). In addition, since the end point of the general-purpose deterioration curve corresponds to the use limit of the bearing, the predetermined value may be a value lower than the end point and set for management.

In the actual machine measurement step, the number of wear particles in the lubricating oil is measured for the actual machine as in the measurement step in the general-purpose deterioration curve creation method, and a deterioration state value (for example, wear) is determined based on the number of wear particles. The particle increase rate ΔPC) can be calculated.
In the lifetime calculation step, the actual machine measurement step can be executed twice or more at an appropriate time to obtain the wear particle increase rate ΔPC at each time point.
FIG. 6A shows a normal change in the wear particle increase rate ΔPC with the passage of the actual time t. Here, the wear particle increase rate value ΔPC _min may be the first value, and the value ΔPC _max may be the second value (use limit value). Wear particles increase the first time of measurement _{(t 1)} is Delta] PC _1, wear particles increase rate in the second time of measurement _{(t 2)} is assumed to be Delta] PC _2. Then, the remaining service life _{t L} at time _{t 2} of the actual machine is on FIG. 6 (a), the wear particles increase rate is time from the time _{t 2} is a Delta] PC ₂ to time _{t 3} reaches the Delta] PC _max.

Therefore, in the life calculation step, a general-purpose deterioration curve as shown in FIG. The general-purpose deterioration curve is created by the above-mentioned general-purpose deterioration curve creation method, and is created so that the time that becomes the use limit is set to 1 on the time axis T that is dimensionlessly quantified. In this universal degradation curve, reading the time _{T 1} that the value of wear particles increase rate becomes Delta] PC _1, and time _{T 2,} which is a Delta] PC _2. According to this general-purpose deterioration curve, the remaining life _TL of this actual machine is the time from time T ₂ when the wear particle increase rate is ΔPC ₂ to time “1” from ΔPC _max .
Therefore, as shown in FIG. 7, based on the remaining life _TL (that is, 1−T ₂ ) on the dimensionless time axis T, the time t _{3 at which} the real machine becomes the use limit in real time, and the real machine The remaining life t _L (ie, t ₃ −t ₂ ) can be obtained.

As described above, the application range of the general-purpose deterioration curve can be from the deterioration progress stage of the slide bearing in which the increase in the number of generated particles is confirmed to the use limit point. Therefore, monitoring of the deterioration state of the actual machine may be started from the time when the rate of increase in the number of generated particles exceeds the value in the deterioration progressing period (ΔPC _min ).

Each of the steps of the machine life prediction method can be generally performed using a computer. That is, a machine life prediction program for performing the machine life prediction method on a computer can be realized.
FIG. 8 shows a configuration example of the machine life prediction program. The machine life prediction program is a machine life prediction program for predicting the life of the rotating machine 1x using the general-purpose deterioration curve created by the general-purpose deterioration curve creating method, and is a lubricating oil for the bearing 2x provided in the rotating machine 1x. The actual machine measurement function 72 that measures the number of wear particles in 4x and calculates the deterioration state value based on the number of wear particles, and the measurement by the actual machine measurement function 72 is performed twice or more, and the deterioration state value calculated each time Is made to correspond to the general-purpose deterioration curve, thereby causing the computer 6 to realize the life calculation function 74 for calculating the time (t _L ) until the deterioration state value reaches a predetermined value as the life.

The number of wear particles can be measured using the wear particle measuring device 5.
The computer 6 is provided with a storage device 60. The storage device 60 stores data constituting the general-purpose deterioration curve created by the general-purpose deterioration curve creation method, and stores the number of wear particles measured in the actual machine 1x, the calculated deterioration state value, and the like. Can be remembered. The computer 6 can calculate the remaining life of the actual machine by processing these data.
Each of the functions need not be provided on one computer 6, and the computer 6 can be configured to include a programmable controller, a data logger, and the like as appropriate.

3. Example [1] Example for a sliding bearing A test for creating a general-purpose deterioration curve by a method for generating a general-purpose deterioration curve was performed using a testing machine as shown in FIG. 9 for a sliding bearing. This tester is called a block-on-disk type in which a disk-shaped disk test piece (corresponding to the shaft body 3A) is brought into contact with a block test piece (corresponding to the bearing 2A) having a rectangular cross section. . The lubricating oil in the oil tank is circulated by the pump until the end of the test during the test. Further, a part thereof is sent to a wear particle measuring device (5) (not shown), and the number of wear particles generated on the friction surface between the disk test piece and the block test piece is measured.

In this embodiment, the lubrication state is changed by setting conditions such as lubricating oil, rotation speed, load, etc. (fluid lubrication state, mixed lubrication state (initial, intermediate, final), boundary lubrication state). By expressing the coefficient of friction in each lubrication state, wear deterioration can be accelerated.
From the state in which the disk test piece was idled at 1500 rpm, a load of 400 N was applied to the block test piece, and the rotation speed was gradually changed from 1500 rpm to 0 rpm in three ways from 20 seconds to 40 seconds. As a result, as shown in FIG. 10A, the friction coefficient μ changes from about 0.02 (fluid lubrication state) to 0.08 or more (near boundary lubrication). FIG. 4B shows the measurement result converted into a change in the friction coefficient μ with respect to the dimensionless time axis T. From this, it was confirmed that the time transition of the friction coefficient μ can be uniquely determined by making the time axis dimensionless, that is, can be expressed as one curve, regardless of the process of the change. This curve is an exponential function as shown in FIG.

  Next, the correlation between the friction coefficient μ and the wear particle increase rate ΔPC was examined. In each lubrication state in which the friction coefficient μ is kept constant, the relationship between the friction coefficient μ and the wear particle increase rate ΔPC is as shown in FIG. 11 (in the figure, the wear particle increase amount is represented by ΔPC. The same applies hereinafter). .) The measurement here corresponds to the mixed lubrication region (0.02 ≦ μ ≦ 0.1). When the friction coefficient is 0.01, the wear particle increase amount ΔPC is assumed to be zero. This is because a lubrication state with a friction coefficient of 0.01 is fluid lubrication, and in this state, it can be considered that an oil film is sufficiently formed and no wear particles are generated from the friction surface. As shown by the regression curve in the figure, it can be seen that there is a linear correlation between the friction coefficient μ and the wear particle increase amount ΔPC in the mixed lubrication region.

From the change in the friction coefficient μ with respect to the dimensionless time axis T (FIG. 10 (b)) and the relationship between the friction coefficient μ and the wear particle increase ΔPC (FIG. 11), the change in the friction coefficient μ It can be replaced with a change in the particle increase amount ΔPC. Then, the change of the wear particle increase amount ΔPC with respect to the dimensionless time T can be expressed as shown in FIG. The change of the wear particle increase amount ΔPC with respect to the dimensionless time T shown in the figure can be expressed using an exponential function (ΔPC = ae ^bT −c, where a, b, and c are parameters). .
This is a general-purpose deterioration curve, and the change in the deterioration state value calculated based on the measured number of wear particles is an index that can manage the lubrication state of the slide bearing.

(Measurement example using actual machine)
As a reference, for the pump, the oil in the sliding bearing box is gradually drained to reduce the oil level and create a severe lubrication state. Whether the degradation curve is applicable was examined.
From the viewpoint of the lubrication state after operating the pump, the change from the initial fluid lubrication state to the lubrication state occurs, and after the point of time when it can be evaluated as the initial stage of mixed lubrication (hereinafter referred to as the deterioration progress point). An increase in the number of wear particles observed was confirmed and the wear rate increased. The change in the number of wear particles per unit volume after the deterioration progress point is as shown in FIG. In a more detailed analysis, it was confirmed that relatively large particles were generated and the generation of relatively small particles was reduced when the number of wear particles exceeded 15000 in the figure. At this point, it is considered that the process of generating wear has transitioned (hereinafter referred to as a wear transition point). In the lubrication state, the wear transition point can be regarded as the boundary lubrication stage from the late stage of the mixed lubrication.

  From the results shown in FIG. 13, the wear particle increase rate ΔPC is calculated from the number of wear particles per unit volume and the time axis is made dimensionless. FIG. 14 shows the general-purpose deterioration curve created by the above. Here, the wear particle increase rate ΔPC of both is converted into a dimensionless amount. Thus, by making the time axis and wear particle increase rate ΔPC dimensionless, it is possible to eliminate the influence of the amount of lubricating oil between the test machine and the actual machine and the difference in the contact area between the shaft and the bearing. Comparison is possible regardless of the conditions.

  As is apparent from FIG. 14, the general-purpose deterioration curve (deterioration master curve) created by the testing machine and the approximate curve representing the wear state (wear particle increase rate ΔPC) measured by the actual machine are in good agreement. . The deterioration progress point corresponds to the first value of the deterioration state value in the general-purpose deterioration curve creation method. The wear transition point corresponds to a second value of the deterioration state value in the general-purpose deterioration curve creation method. Therefore, it can be said that the general-purpose deterioration curve created by the general-purpose deterioration curve creation method can be widely applied to the evaluation of the wear state of actual machines. Further, it can be said that the remaining life until the actual machine reaches the wear transition point can be evaluated by the mechanical life prediction method.

  When applying the general-purpose deterioration curve to the actual machine, measure the number of wear particles in the lubricating oil of the bearing, and after the point when the number of wear particles or the rate of increase exceeds a certain value (deterioration progress point), the number of wear particles Change should be monitored. Then, the deterioration state value (for example, the wear particle increase rate ΔPC) is calculated based on the measured number of wear particles, and the wear state of the actual machine can be evaluated by corresponding to the general-purpose deterioration curve.

Then, by correlating the deterioration state values at different times (at least twice) with the general-purpose deterioration curve, the time until the deterioration state value reaches a predetermined value (for example, the value of the wear transition point) It can be calculated as the remaining life of the bearing.
The number of wear particles in the lubricating oil of the actual machine can be constantly sampled by using the wear particle measuring device 5 and the machine life prediction program having the actual machine measuring function. Therefore, the mechanical life prediction method can also be used as a screening means for carrying out a more detailed diagnosis or the like in the management of a rotating machine equipped with a bearing.

[2] Examples for rolling bearings The general-purpose deterioration curve creation method and the machine life prediction method can be applied to a rotating machine including a rolling bearing.
In general, rolling bearing damage is caused by rolling fatigue and other factors (seizure, galling, cracking, cracking, chipping, wear, etc.). Rolling fatigue is a phenomenon in which the bearing material is operated while supporting a load exceeding the fatigue limit, and fatigue failure of the bearing material occurs on the rolling contact surface between the rolling element and the raceway surface. When rolling fatigue occurs on the rolling contact surface, scaly peeling occurs, so-called peeling occurs. The general-purpose deterioration curve creation method and the mechanical life prediction method can be applied to flaking, which is the life of a rolling bearing.

  In the rolling bearing, contact stress is repeatedly generated below the raceway surfaces of the rolling elements and the inner and outer rings. Under rolling contact, cracks develop due to repeated shear forces. The crack propagates and eventually leads to flaking. The deterioration state of the rolling bearing changes from initial wear, steady wear, and abnormal wear. The initial wear is a process of deformation or wear of the surface protrusions of the soft metal. Steady wear is a process in which an oil film is sufficiently formed and changes in surface protrusions and wear are reduced. Abnormal wear is a process in which cracking under rolling contact develops and flaking, which is the life of a rolling bearing, occurs. According to the inventors' past knowledge, the number of wear particles in the lubricating oil increases rapidly during the period of abnormal wear.

FIG. 15 shows a rolling test machine used for the acceleration test of the rolling bearing. A downward radial load (L) is applied to the bearing of the testing machine (corresponding to the test bearing 2B shown in FIG. 1) through the housing. The lubricating oil in the oil tank is circulated between a separately provided main oil tank. In this test, in order to prevent the temperature of the test bearing from rising, the oil after being cooled in the cooling water tank is supplied to the test bearing from the upper part of the housing.
A part of the lubricating oil in the oil tank is sent to the wear particle measuring device 5, and the number and size of the wear particles generated in the oil tank are measured. The wear particle measuring device 5 can identify bubbles and particles, and can perform measurement online. The load L applied to the bearing is manually adjusted in the range of 0 to 22 kN. In addition, the tester is provided with a torque meter, a vibration sensor, a temperature sensor, and the like for measuring the number of rotations of the shaft, vibration of the bearing, temperature, and the like.

  In this accelerated test, the period from the end of the running-in process until the rolling bearing deteriorated and flaking was confirmed was targeted. Since the life of rolling bearings is considered to be the point at which the bearing material undergoes fatigue failure, the change in the number of wear particles (especially the rate of increase in the number of wear particles) was measured assuming fatigue wear due to Hertz contact.

The starting point of the period for obtaining the general-purpose deterioration curve using the above testing machine is the point at which the increase in the number of generated wear particles during steady wear was confirmed (deviated from the value obtained by adding standard deviation + σ to the average value of the number of generated wear particles) Point). Further, when flaking occurs in the bearing, vibration associated therewith occurs, so the test was terminated when the vibration exceeded a certain value. The end point of the period for obtaining the general-purpose deterioration curve was the maximum point of the number of generated wear particles during abnormal wear.
FIG. 16 shows an example of measurement results of the above test (changes in the number of wear particles and approximate curves thereof).

FIG. 17 shows an approximate curve of a deterioration state value (abrasion particle increase rate ΔPC) obtained from measured values under various conditions including the above example, with the time axis made dimensionless and the deterioration state value made dimensionless. It is a represented graph. From this figure, it can be seen that the change of the dimensionless amount of wear particle increase ΔPC ′ with respect to the dimensionless amount of time can be represented by one curve regardless of the conditions. The curve can be expressed using an exponential function as shown in FIG. The constant of the function shown in the figure is the average value of the approximate curve under the above conditions.
The curve shown in FIG. 18 is a general-purpose deterioration curve, which is an index that can manage the fatigue wear of a rolling bearing by measuring the change in the number of wear particles.

  Various sizes of rolling bearings are used in actual rotating machines (actual machines). The progress of fatigue wear leading to damage to the rolling bearing is the same regardless of the bearing size, and the general-purpose deterioration curve created using the test machine (FIG. 15) is applied to actual machines having various bearing sizes. It seems possible. In order to confirm this point, a test was performed using another rolling bearing having a size different from that used in the acceleration test.

FIG. 19 shows a summary of the test results of the different rolling bearings performed several times under various conditions. The figure shows the change of the wear particle increase rate ΔPC ′ (dimensionless amount) calculated based on the number of wear particles measured each time with respect to time (dimensionless amount). Thus, by making the time axis and the wear particle increase rate ΔPC non-dimensional, the influence of the difference in the bearing and the oil amount can be eliminated, and comparison is possible regardless of the conditions of the target actual machine.
As is clear from FIG. 19, the approximate curve of the wear particle increase rate ΔPC ′ can be expressed as one curve by an exponential function regardless of the bearing size and the conditions. And it agrees well with the general-purpose deterioration curve created by the acceleration test.

Therefore, the general-purpose deterioration curve creation method can be widely applied to the evaluation of the fatigue wear state of rolling bearings provided in actual machines. It can also be seen that the remaining life until flaking occurs in the actual machine can be evaluated by the mechanical life prediction method.
When applying general-purpose deterioration curves to actual machines, the number of wear particles in the rolling bearing lubricant is measured, and after the number of wear particles or deterioration state value exceeds a certain value (deterioration progress point), the wear particles What is necessary is just to monitor the change of a number. During the monitoring period, the deterioration state value (wear particle increase rate ΔPC) is calculated based on the measured number of wear particles, and the wear state of the actual machine can be evaluated by corresponding to the general-purpose deterioration curve. Then, by causing deterioration state values at different times (two or more times) to correspond to the general-purpose deterioration curve, as shown in FIGS. 6 and 7, the deterioration state value reaches a predetermined value (a value that causes flaking). Can be calculated as the remaining life of the rotating machine (rolling bearing).

  The number of wear particles in the lubricating oil of the actual machine can be constantly sampled by using the wear particle measuring device 5 and the machine life prediction program having the actual machine measuring function. Therefore, the present machine life prediction method can also be used as a screening means for carrying out a more detailed diagnosis or the like in the management of a rotating machine equipped with a rolling bearing.

From each of the embodiments described above, it is possible to continuously measure wear particles in a rotating machine that is actually operating without using a testing machine, regardless of whether it is a rotating machine equipped with a slide bearing or a rolling bearing. It is possible to create a general-purpose deterioration curve. That is, the general-purpose deterioration curve generation method for evaluating the deterioration state of a rotating machine equipped with a bearing operated in lubricating oil measures the number of wear particles in the lubricating oil of the rotating machine, and the deterioration based on the number of wear particles. A measurement step for calculating a state value; a deterioration state value collecting step for collecting the deterioration state value each time by causing the wear particle count to be repeatedly measured by the measurement step; and the deterioration collected by the deterioration state value collecting step. A general-purpose deterioration curve creating step of creating a change in the deterioration state value with respect to an elapsed time from when the state value becomes equal to or higher than the first value to the second value as a general-purpose deterioration curve; Is configured such that time is dimensionlessly quantified based on the elapsed time, and the deterioration state value is dimensionlessly quantified based on the first value and the second value. Door can be.
As the deterioration state value, the number of the wear particles per unit oil amount, the increase number per unit time, the increase rate, and the like can be appropriately selected.

  In addition, a general-purpose deterioration curve creation program that performs the above-described general-purpose deterioration curve creation method can be configured. That is, a general-purpose deterioration curve creation program for evaluating the deterioration state of a rotating machine equipped with a bearing operated in lubricating oil measures the number of wear particles in the lubricating oil, and the deterioration state value based on the number of wear particles A measurement function that calculates the wear particle number by the measurement function repeatedly, a deterioration state value collection function that collects the deterioration state value each time, and the deterioration state value collected by the deterioration state value collection function A general-purpose deterioration curve creating function for creating a general-purpose deterioration curve as a general-purpose deterioration curve for the change of the deterioration state value with respect to the elapsed time from when the value becomes equal to or greater than the first value to the second value, and the general-purpose deterioration The curve is configured such that time is dimensionlessly quantified based on the elapsed time and the degradation state value is dimensionlessly quantified based on the first value and the second value. Can.

  In the present invention, the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention depending on the purpose and application.

1, 1A, 1B; test machine, 1x; rotating machine (actual machine),
2, 2A, 2B; (test) bearing, 2x; (real machine) bearing,
3, 3A, 3B; (test) shaft, 3x; (actual) shaft,
4; test lubricant, 4x; (actual) lubricant,
5; wear particle measuring device,
6; computer, 60; storage device, 62; drive function, 64; measurement function, 66; deterioration state value collection function, 68; general-purpose deterioration curve creation function, 72; actual machine measurement function, 74;
82; Motor, 9; Base, 92; Housing.

Claims (16)

A general-purpose degradation curve creation method for evaluating the degradation state of a rotating machine equipped with a bearing operated in lubricating oil,
A test machine that includes a shaft body and a bearing made of the same material as the rotating machine, applies a predetermined load to the bearing and rotates the shaft body in lubricating oil,
A driving step of rotating the shaft body of the testing machine at a predetermined rotational speed;
A measurement step of measuring the number of wear particles in the lubricating oil and calculating a deterioration state value based on the number of wear particles;
After starting the rotation of the shaft body by the driving step, the wear state number is repeatedly measured by the measurement step, and the deterioration state value collecting step of collecting the deterioration state value each time,
General-purpose deterioration that creates a change in the deterioration state value as a general-purpose deterioration curve with respect to the elapsed time from when the deterioration state value collected by the deterioration state value collection step becomes equal to or greater than a first value until it becomes a second value. A curve creation step;
With
The general-purpose deterioration curve is characterized in that time is dimensionlessly quantified based on the elapsed time, and the deterioration state value is dimensionlessly quantified based on the first value and the second value. Deterioration curve creation method.   The method according to claim 1, wherein the deterioration state value is one of the number of the wear particles per unit oil amount, the increase number per unit time, and the increase rate thereof.   The general-purpose deterioration curve creation method according to claim 1, wherein the bearing of the rotating machine is a slide bearing.   The general-purpose deterioration curve creation method according to claim 1, wherein the bearing of the rotating machine is a rolling bearing. A machine life prediction method for predicting the remaining life of a rotating machine using the general-purpose deterioration curve created by the general-purpose deterioration curve creation method according to claim 1,
An actual machine measuring step of measuring the number of wear particles in the lubricating oil of the bearing provided in the rotating machine, and calculating a deterioration state value based on the number of wear particles;
A lifetime in which the actual machine measurement step is performed twice or more, and the time until the deterioration state value reaches a predetermined value is calculated as the remaining life by associating the deterioration state value calculated each time with the general-purpose deterioration curve. A calculation step;
A machine life prediction method comprising:   6. The machine life prediction method according to claim 5, wherein the deterioration state value is one of the number of the wear particles per unit oil amount, the increase number per unit time, and the increase rate thereof.   The mechanical life prediction method according to claim 5 or 6, wherein the bearing of the rotating machine is a slide bearing.   The mechanical life prediction method according to claim 5 or 6, wherein the bearing of the rotating machine is a rolling bearing. A general-purpose deterioration curve creation program for evaluating the deterioration state of a rotating machine equipped with a bearing operated in lubricating oil,
A test machine that includes a shaft body and a bearing made of the same material as the rotating machine, applies a predetermined load to the bearing and rotates the shaft body in lubricating oil,
A measurement function for measuring the number of wear particles in the lubricating oil and calculating a deterioration state value based on the number of wear particles;
After the rotation of the shaft body is started, the wear state number is repeatedly measured by the measurement function, and the deterioration state value collecting function for collecting the deterioration state value each time,
General-purpose deterioration that creates a change in the deterioration state value as a general-purpose deterioration curve with respect to the elapsed time from when the deterioration state value collected by the deterioration state value collection function becomes equal to or greater than the first value until it becomes the second value Curve creation function,
Is realized on a computer,
The general-purpose deterioration curve is characterized in that time is dimensionlessly quantified based on the elapsed time, and the deterioration state value is dimensionlessly quantified based on the first value and the second value. Deterioration curve creation program.   The general-purpose deterioration curve creation program according to claim 9, wherein the deterioration state value is one of the number of wear particles per unit oil amount, the increase number per unit time, and the increase rate thereof.   The general purpose deterioration curve creation program according to claim 9 or 10, wherein the bearing of the rotating machine is a slide bearing.   The general-purpose deterioration curve creation program according to claim 9 or 10, wherein the bearing of the rotating machine is a rolling bearing. A machine life prediction program for predicting the remaining life of a rotating machine using the general-purpose deterioration curve created by the general-purpose deterioration curve creation method according to any one of claims 1 to 4,
An actual machine measurement function for measuring the number of wear particles in the lubricating oil of the bearing provided in the rotating machine and calculating a deterioration state value based on the number of wear particles;
By making the measurement by the actual machine measurement function twice or more, and by making the deterioration state value calculated each time correspond to the general-purpose deterioration curve, the time until the deterioration state value reaches a predetermined value is set as the remaining life. Life calculation function to calculate,
Machine life prediction program characterized by causing a computer to realize   The machine life prediction program according to claim 13, wherein the deterioration state value is one of the number of the wear particles per unit oil amount, the increase number per unit time, and the increase rate thereof.   The machine life prediction program according to claim 13 or 14, wherein the bearing of the rotating machine is a slide bearing.   The machine life prediction program according to claim 13 or 14, wherein the bearing of the rotating machine is a rolling bearing.