JP5661512B2 - Oil lubrication type rolling device and threshold setting method for monitoring abnormalities of moisture concentration in the lubricating oil - Google Patents

Description

  The present invention relates to an oil-lubricated rolling device, and more particularly, to a rolling device having a monitoring function of a mixed water concentration in the lubricating oil, and a threshold setting method for monitoring an abnormal mixed water concentration.

  When rolling parts such as rolling bearings and gears are used under conditions where water is mixed (Non-Patent Documents 1 to 5) and conditions involving slipping (Non-Patent Document 6), water and lubricant are decomposed. As hydrogen is generated, it can penetrate into the steel and cause premature damage. When metal contact occurs at the contact surface between the contact elements and the new metal surface is exposed, generation of hydrogen due to decomposition of water and lubricant, and penetration into the steel are promoted. This is an experiment in which diffusible hydrogen was clearly detected in steel as a result of thermal desorption hydrogen analysis after abrasive wear of rolling parts steel with emery paper while dripping water and lubricant. This is proved by the facts (Non-patent Document 7). According to this, more diffusible hydrogen is detected when water is dropped than lubricating oil. Therefore, it can be said that when water is mixed in the lubricant of the rolling parts used under the condition that slip occurs, hydrogen is further generated and easily enters the steel. Since hydrogen significantly reduces the fatigue strength of steel (Non-Patent Document 8), even if the maximum contact surface pressure is not so large, early hydrogen damage occurs.

JP 2006-138376 A

El. By L. Grunberg, Proc. Phys. Soc. (London), B66 (1953) 153-161. El. Granberg, Di. Scott (L. Grunberg and D. Scott), J. Inst. Petrol., 44 (1958) 406-410. El. L. Grunberg, Di Tee Jamison, Di. Scott (D. T. Jamieson and D. Scott), Philosophical magazine, 8 (1963) 1553-1568. Pee. Schatzberg, Ai. M. By P. Schatzberg and I. M. Felsen, Wear, 12 (1968) 331-342. Pee. By P. Schatzberg, J. Lub. Tech., 231 (1971) 231-235. Kay. Tamada, etch. Tanaka (K. Tamada and H. Tanaka), Wear, 199 (1996) 245-252. Kei Tanimoto, Hiromasa Tanaka, Shoichi Sugimura, Tribology Conference Proceedings, (2010-5 Tokyo), 203-204. Wy. Matsubara, etch. Hamada (Y. Matsubara and H. Hamada), Bearing Steel Technology, ASTM STP1465, J. M. Beswick Ed., (2007), 153-166. Etch. Micami, tee. Kawamura (H. Mikami and T. Kawamura), SAE Paper, (2007), No. 2007-01-0113. Tomoaki Makino, dissertation (Kyoto University), (2000), 134p.

As described above, it can be said that when water is mixed in the lubricant of the rolling part used under the condition that slip occurs, hydrogen is further generated and easily penetrates into the steel. Rolling parts will tend to be used in conditions where hydrogen is more likely to be generated. Therefore, it is necessary to monitor early contamination due to hydrogen embrittlement by monitoring the mixed water concentration in the lubricating oil and diagnosing excessive mixed water concentration.
In Patent Document 1, as one function of the monitoring / diagnosis system, a dielectric constant proportional to a capacitance described later is monitored, and the oxidation degree of the lubricant is monitored / diagnosed. However, only the concept is described, and no specific data is described. Moreover, it is limited to the abnormality diagnosis of a rolling bearing. The moisture content in the lubricating oil must be measured not only by capacitance but also by temperature dependence.

  The reason why water is mixed in the lubricating oil of the oil lubricated rolling device will be described. It is considered that the moisture concentration in the lubricating oil of the oil-lubricated rolling device is breathing even when it is closed macroscopically due to fluctuations in daily warmth and dryness, especially when used outdoors. As a case where water is mixed in the lubricating oil of the rolling device, for example, a mechanism as shown in FIG. 20 (oil bath oil supply) or FIG. 21 (circulation oil supply) can be considered. As shown in the upper side of both figures, during operation, the temperature inside the rolling device becomes higher than the outside air temperature, so that the inside of the rolling device becomes a positive pressure, and a part of the inside air is discharged to the outside. On the other hand, as shown in the lower side of both drawings, when the temperature in the rolling device stops and the temperature in the rolling device falls below the outside air temperature, the inside of the rolling device becomes negative pressure, so that outside air enters the rolling device. When the outside air that has entered is humid, dew condensation occurs in the rolling device, and moisture is mixed into the lubricating oil. In this way, even in normal use, water can be mixed into the lubricating oil. When the rolling device is exposed to heavy rain or heavy wind and rain, it is considered that more water is mixed.

An object of the present invention is to provide an oil lubrication type rolling device having a function capable of accurately determining the concentration of moisture contained in lubricating oil and suppressing early damage caused by hydrogen embrittlement of rolling parts. It is to provide an oil lubrication type rolling device that can be used.
Another object of the present invention is to make it possible to more reliably suppress early damage caused by hydrogen embrittlement of rolling parts by performing an abnormality diagnosis when the mixed water concentration exceeds a threshold value.
Still another object of the present invention is to provide an abnormality diagnosis threshold value setting method for an oil lubrication type rolling device capable of obtaining and setting a threshold value for appropriately performing the abnormality diagnosis.

The oil lubrication type rolling device according to the present invention is provided with a mixed water concentration monitoring device that monitors the mixed water concentration in the lubricating oil in the oil lubrication type rolling device, and the mixed water concentration monitoring device is provided in the lubricating oil. Capacitance detection means and oil temperature measurement means for detecting the electrostatic capacity and oil temperature of the oil, respectively, and a predetermined rule based on the capacitance and oil temperature detected by these capacitance detection means and oil temperature measurement means A moisture concentration calculating means for detecting the mixed moisture concentration in accordance with the capacitance and oil temperature measurement chamber in which the capacitance detecting means and the oil temperature measuring means are installed. provided inside or outside, a stirring means for stirring the lubricating oil in the measuring chamber is provided, wherein the moisture concentration calculating means, and a lower subsidiary to detect contamination water concentration in the lubricant was stirred at the stirring means Features .

  According to this configuration, the capacitance detecting means and the oil temperature measuring means for detecting the capacitance and oil temperature in the lubricating oil, and the moisture concentration calculation for detecting the mixed moisture concentration from the detected capacitance and oil temperature. And the mixed water concentration is obtained from the capacitance and the oil temperature, so that the mixed water concentration can be obtained with high accuracy. For this reason, in the oil lubrication type rolling device, it is possible to monitor the mixed water concentration in the lubricating oil with high accuracy, and to suppress early damage due to hydrogen embrittlement of the rolling parts.

  In the present invention, it is preferable to provide an abnormality diagnosing means for comparing the mixed water concentration calculated by the water concentration calculating means with a threshold and diagnosing an abnormality when the threshold is exceeded. When the abnormality diagnosis means is provided, early damage due to hydrogen embrittlement of the rolling parts can be more reliably suppressed by performing abnormality diagnosis when the mixed water concentration exceeds the threshold value.

In this specification, the “rolling device” refers to a device composed of parts including elements that roll and slide, such as rolling bearings and gears.
Examples of the oil lubrication type rolling device include the following. Oil lubrication can be subdivided into oil bath lubrication, jet lubrication, circulation lubrication, oil mist lubrication, air oil lubrication, splash lubrication, hydraulic fluid immersion, etc. .
・ Gas turbine (jet fueling)
・ Hydraulic pump (hydraulic oil immersion)
・ Printer (circulation lubrication)
-Twisted wire machine (jet or circulating oiling)
・ Paper making machine (circulation lubrication)
・ Reduction gear for industrial machinery (circulation lubrication)
・ Robot reducer (oil bath lubrication)
・ Aircraft engine (jet refueling)
・ Construction machine parts (oil bath lubrication)
・ Steel rolling mill roll neck (oil mist lubrication)
・ Reducer for rolling mill (circulation lubrication)
・ Machine tools (air-oil lubrication)
・ Railway car axle (splash refueling)
・ Railway vehicle drive system (oil bath lubrication)
・ Mine machine vertical mill tire roller (circulating lubrication or oil bath lubrication)
・ Reduction gear for mill (circulation lubrication or oil bath lubrication)
・ Wind wheel speed increaser (circulation lubrication) (oil bath lubrication)
・ Automotive transmission (splash refueling)

The rolling device of this invention may have a lubricating oil storage tank that performs oil bath lubrication. In this case, a capacitance and oil temperature measurement chamber in which the capacitance detection means and the oil temperature measurement means are installed may be provided inside the housing of the rolling device. If a measurement chamber for capacitance and oil temperature is provided inside the rolling device, the measurement chamber can be arranged by utilizing the empty space of the housing, and the enlargement of the rolling device due to the installation of the measurement chamber can be avoided. .
Further, in the case of having a lubricating oil reservoir for oil bath lubrication, a capacitance and oil temperature measurement chamber in which the capacitance detection means and the oil temperature measurement means are installed outside the rolling device housing. It may be provided. If a capacitance and oil temperature measurement chamber is provided outside the rolling device, it can be applied even when there is no room to install the measurement chamber in the rolling device housing. Is less.
When the measurement chamber is provided, a stirring means for stirring the lubricating oil in the capacitance and oil temperature measurement chamber may be provided. By stirring the lubricating oil, the mixed state of the lubricating oil and water is improved, and the mixed water concentration can be detected with higher accuracy.

The rolling device according to the present invention may have a circulating oil supply means for performing circulating oil supply. In this case, a capacitance and oil temperature measurement chamber in which the capacitance detection means and the oil temperature measurement means are installed may be provided inside the housing of the rolling device.
In addition, a capacitance and oil temperature measurement chamber in which the capacitance detection means and the oil temperature measurement means are installed may be provided outside the rolling device housing.
When the measurement chamber is provided, a stirring means for stirring the lubricating oil in the measurement chamber may be provided.

  In this invention, when the measurement chamber is provided and the stirring means is provided, the amount of lubricating oil accumulated in the measurement chamber for capacitance and oil temperature is 100 mL or less, and the variation is ± 5 mL or less. Is good.

  Further, it is preferable to provide means for facilitating discharge of water and additives having a specific gravity greater than that of the lubricating oil from the rolling device and the capacitance and oil temperature measurement chambers. This means is constituted by, for example, an inclined groove on the bottom surface of the lubricating oil reservoir. The lubricating oil is allowed to flow into the measurement chamber from the lowest part of the bottom surface of the inclined groove.

  In the rolling device according to any one of the above configurations of the present invention, as described above, the mixed moisture concentration calculated by the moisture concentration calculating means is compared with a threshold value, and an abnormality is diagnosed when the threshold value is exceeded. It is preferable to provide a diagnostic means. The threshold value may be obtained and set by any one of the following methods.

  For example, water is injected into the lubricating oil, the capacitance and oil temperature are measured to monitor the mixed water concentration, and feedback is made to control the water injection amount so that the mixed water concentration is kept within a certain range. A threshold value of the mixed water concentration obtained by the rolling and sliding fatigue life test may be obtained, and the obtained threshold value may be set as a threshold value in the abnormality diagnosis means. In addition, what is necessary is just to let the threshold value calculated | required by this test be a value used as the mixing | mixing water density | concentration arbitrarily defined as appropriate for judgment. The same applies to each test.

  In addition, a threshold value of the mixed moisture concentration is obtained by a rolling-slip fatigue life test in which a contact surface is caused to slip by a movement mechanism between contacting elements, and the obtained threshold value is set as a threshold value in the abnormality diagnosis means. May be.

  Even if the threshold value of the mixed moisture concentration is obtained by a rolling-slip fatigue life test for forcibly causing a slip on the contact surface between the contacting elements, and the obtained threshold value is set as a threshold value in the abnormality diagnosis means. good.

  A threshold value of the mixed water concentration may be obtained by a rolling and sliding fatigue life test that is rotated in one direction at a constant rotational speed until damage occurs, and the obtained threshold value may be set as a threshold value in the abnormality diagnosis means.

  A threshold value of the mixed moisture concentration may be obtained by a rolling / sliding fatigue life test in which acceleration / deceleration operation is performed until damage occurs, and the obtained threshold value may be set as a threshold value in the abnormality diagnosis unit.

  A threshold value of the mixed water concentration may be obtained by a rolling / sliding fatigue life test in which rocking motion is performed until damage occurs, and the obtained threshold value may be set as a threshold value in the abnormality diagnosis means.

  In order to eliminate the superposed vibration component as much as possible so that damage can be accurately detected by vibration, the rolling moisture fatigue threshold test of the mechanism that directly connects the main shaft of the servo motor and the spindle of the test unit is used. A value may be obtained and the obtained threshold value may be set as a threshold value in the abnormality diagnosis means.

  Rolling-slip fatigue life test that uses ceramic rolling elements for the spindle support bearing and insulates the motor from the spindle of the test unit, in order to promote wear of the damaged object by passing current between the contact elements with the damaged object as the positive electrode side. It is also possible to obtain a threshold value of the mixed water concentration by the above and set the obtained threshold value as a threshold value in the abnormality diagnosis means.

  A threshold value of the moisture content is determined by a rolling and sliding fatigue life tester that can perform acceleration / deceleration operation and swing motion in addition to a constant rotational speed and one-way rotation. It may be set as a value.

The oil lubrication type rolling device according to the present invention is provided with a mixed water concentration monitoring device that monitors the mixed water concentration in the lubricating oil in the oil lubrication type rolling device, and the mixed water concentration monitoring device is provided in the lubricating oil. Capacitance detection means and oil temperature measurement means for detecting the electrostatic capacity and oil temperature of the oil, respectively, and a predetermined rule based on the capacitance and oil temperature detected by these capacitance detection means and oil temperature measurement means A moisture concentration calculating means for detecting the mixed moisture concentration in accordance with the capacitance and oil temperature measurement chamber in which the capacitance detecting means and the oil temperature measuring means are installed. provided inside or outside, a stirring means for stirring the lubricating oil in the measuring chamber is provided, because the water concentration calculating means, which was assumed to detect the contamination concentration of water stirred lubricating oil in said stirring means Oil lubrication method In the rolling device monitors the contamination water content in the lubricant becomes that a function can be obtained with high accuracy, it is possible to suppress premature damage to hydrogen embrittlement due to the rolling part.
When the contamination moisture concentration calculated by the moisture concentration calculation means is compared with a threshold value and an abnormality diagnosis means for diagnosing an abnormality when the threshold value is exceeded is provided, the contamination moisture concentration exceeds the threshold value By making an abnormal diagnosis, early damage due to hydrogen embrittlement of the rolling parts can be more reliably suppressed.
According to the abnormality diagnosis threshold value setting method for any of the oil lubrication type rolling devices of the present invention, it is possible to obtain and set a threshold value for appropriately performing the abnormality diagnosis.

1 is a block diagram showing a conceptual configuration of an oil lubrication type rolling device according to a first embodiment of the present invention. It is a block diagram which shows the conceptual structure of the oil lubrication type | formula rolling device concerning other embodiment of this invention. It is a block diagram which shows the conceptual structure of the oil lubrication type | mold rolling device concerning further another embodiment of this invention. It is a block diagram which shows the conceptual structure of the oil lubrication type | mold rolling device concerning further another embodiment of this invention. It is a block diagram which shows the conceptual structure of the oil lubrication type | mold rolling device concerning further another embodiment of this invention. It is a block diagram which shows the conceptual structure of the oil lubrication type | mold rolling device concerning further another embodiment of this invention. It is sectional drawing which shows an example used as the specific example of a rolling device. It is a conceptual diagram of an example of the test apparatus used for the rolling sliding fatigue life test method for calculating | requiring the suitable threshold value determined with the abnormality diagnostic threshold value setting method of the oil lubrication type rolling device of this invention. It is a pattern diagram which shows the example of the minimum pattern setting of the acceleration / deceleration driving | operation in the test method. It is a conceptual diagram of the other example of a test apparatus. It is a conceptual diagram of the further another example of a test apparatus. (A) is a front view of an example of the test piece which comprises the rolling component simulation body used for the test method, (B) is sectional drawing of the rolling component simulation body incorporating the test piece. It is sectional drawing of the test apparatus used for the test of the test piece of the rolling component simulation body of FIG. It is a graph which shows the change of the amount of mixed water measured by the same test. It is a schematic diagram of the test apparatus used for the saturated water concentration measurement of lubricating oil. It is a graph which shows the relationship between the mixing water density | concentration measured with the test apparatus of FIG. 15, and an electrostatic capacitance. It is a schematic diagram of the test apparatus used for the capacitance measurement of water-mixed oil. It is a graph which shows the relationship between the mixing water density | concentration measured with the testing apparatus of FIG. 17, and an electrostatic capacitance. It is a graph which shows the relationship between the oil temperature measured by the same test, and an electrostatic capacitance. It is a schematic diagram which shows the form of the water | moisture content mixing in the lubricating oil in the rolling device of an oil bath lubrication type. It is a schematic diagram which shows the form of the water | moisture content mixing in the lubricating oil in the rolling device of a circulating oil supply type.

  A first embodiment of the present invention will be described with reference to FIG. FIG. 1 shows a conceptual configuration of this oil lubrication type rolling device. The oil lubrication type rolling device includes a rolling device main body 1 and a control device 2 that controls the rolling device main body 1. The rolling device main body 1 refers to a portion of the rolling device excluding the control device 2. The rolling device is a device having a part including a rolling and sliding contact element such as a rolling bearing or a gear, and may be any of a reduction gear, a speed increaser, and other various devices, For example, it is configured by any one of the devices listed in [Means for Solving the Problems].

  In this embodiment, the rolling device main body 1 has a plurality of rolling parts 3 including rolling bearings and gears in the housing 4. In this specification, “rolling part” means a part including a contact element that rolls and slides. The lubrication method is an oil bath lubrication method among the oil lubrication methods, and a part of the housing 4 is lubricated so that all of the rolling parts 3 or any one of the rolling parts 3 is immersed. A lubricating oil storage tank 4a for storing oil 5 is provided.

  In the rolling device having the above configuration, a mixed water concentration monitoring device 6 for monitoring the mixed water concentration of the lubricating oil 5 in the lubricating oil storage tank 4a is provided. The mixed water concentration monitoring device 6 includes a capacitance detecting means 7 and an oil temperature measuring means 8 for detecting a capacitance and an oil temperature in the lubricating oil 5, respectively, and a mixed water concentration detecting means 11. The mixed water concentration detecting means 11 includes a water concentration calculating means 9 for detecting the mixed water concentration from the electrostatic capacity and the oil temperature detected by the electrostatic capacity detecting means 7 and the oil temperature measuring means 8 according to a predetermined rule. The mixed moisture concentration calculated by the moisture concentration calculating means 9 is compared with a threshold value S, and the abnormality diagnosing means 10 for diagnosing an abnormality when the threshold value S is exceeded. The abnormality diagnosis unit 10 is not necessarily provided. The capacitance detection means 7 may be any device that is immersed in a liquid and capable of detecting the capacitance of the liquid, and various types of capacitance meters can be used. For the oil temperature measuring means 8, a thermocouple or the like is used.

  The water concentration calculating means 9 and the abnormality diagnosing means 10, that is, the mixed water concentration detecting means 11 are constituted by a computer such as a microcomputer or a personal computer and a program thereof, or by a dedicated electronic circuit. For example, it is provided as a part of a computer-type control device 2 that controls the rolling device main body 1 or as a device independent of the control device 2.

  The moisture concentration calculating means 9 has a relationship setting means 9a in which the relationship between the capacitance, the oil temperature, and the mixed moisture concentration is set by a calculation formula or a table. From the input capacitance and oil temperature, The mixed water concentration is calculated using the relationship stored in the relationship setting means 9a, that is, the above-defined rule.

  According to the oil lubrication type rolling device of this configuration, the capacitance and oil temperature in the lubricating oil 5 are detected by the capacitance detection means 7 and the oil temperature measurement means 8, and the detected capacitance and oil temperature are detected. From the above, the water concentration calculation means 9 detects the mixed water concentration. In this way, since the mixed water concentration is obtained from the capacitance and the oil temperature, the mixed water concentration can be obtained with high accuracy. Therefore, in the oil lubrication type rolling device, the water concentration in the lubricating oil 5 can be monitored and accurately obtained, and early damage due to hydrogen embrittlement of the rolling parts can be suppressed. Further, since the abnormality diagnosis means 10 is provided and the abnormality is determined when the mixed water concentration exceeds the threshold value S, early damage due to hydrogen embrittlement of the rolling component 3 can be more reliably suppressed. Can do. The reason why the mixed water concentration can be accurately detected from the capacitance and the oil temperature will be described later in the explanation section of the threshold value S setting method.

In the above embodiment, the capacitance and the oil temperature of the lubricating oil 5 in the lubricating oil reservoir 4a in the housing 4 are measured. However, as shown in FIG. The measurement chamber 12 communicated with the inside of the storage tank 4a may be provided, and the capacitance detection means 7 and the oil temperature measurement means 8 may be installed so as to measure the capacitance and the oil temperature in the measurement chamber 12, respectively. In this case, a stirring means 13 for stirring the lubricating oil 5 in the measurement chamber 12 may be provided. The measurement chamber 12 is, for example, a partition chamber that partitions a part of the lubricating oil storage tank 4a. If the measurement chamber 12 is in the housing 4, an increase in size of the rolling device due to the provision of the measurement chamber 12 can be avoided. The stirring means 13 includes, for example, a stirring blade and a motor that rotates the rotating blade. When the measurement chamber 12 is provided and the stirring means 13 is provided, it is preferable that the amount of lubricating oil accumulated in the measurement chamber 12 is 100 mL or less and the fluctuation amount is ± 5 mL or less.
Other configurations in the embodiment of FIG. 2 are the same as those of the first embodiment shown in FIG.

  By providing the measurement chamber 12, stable capacitance and oil temperature can be measured. In addition, by providing the stirring means 13, the mixed state of the lubricating oil and water is improved, and more stable capacitance and oil temperature can be measured.

  Later, it will be described together with a rolling and sliding fatigue life test. When the mixed state of the lubricating oil and water is not good, the capacitance value becomes unstable as the mixed water concentration increases. This is also true for the case of monitoring the moisture concentration in the lubricating oil of the oil bath circulation type or oil lubrication type rolling device. In contrast to the rolling and sliding fatigue life test that intentionally improves the mixing state of the lubricating oil and water, it can be easily imagined that the mixing state of the lubricating oil and water is not good because the rolling device may be stopped. Lubricating oil and water may be separated. For this reason, it is desirable to provide a mechanism for mixing lubricating oil and water as much as possible in the rolling device, and to measure the capacitance as accurately as possible. Therefore, it is preferable to stir by providing the stirring means 13.

  In addition, you may provide the stirring means 13 in the corner | angular part etc. in the lubricating oil storage tank 4a, without providing the measurement chamber 12. FIG. However, in order to make the mixed state of the lubricating oil and water as good as possible, it is preferable to partition and provide the measurement chamber 12. Without partitioning, it is considered difficult to improve the mixing state of the lubricating oil and water. However, when the mixed state of the lubricating oil and water is not good, a higher capacitance value is measured, so that the mixed water concentration can be increased, that is, can be monitored for safety. However, when the lubricating oil and water are separated, it is considered that a higher capacitance value is measured. In such a case, it is necessary to be careful because monitoring is too safe and the number of maintenance and costs may be excessive.

  The measurement chamber 12 may be installed outside the housing 4 as shown in FIG. In this case, the measurement chamber 12 may be provided in contact with the housing 4 or separated from the housing 4. When separated, the measurement chamber 12 and the lubricating oil reservoir 4a of the housing 4 are communicated with each other through a communication pipe (not shown). If the measurement chamber 12 is provided outside the housing 4, the capacitance detection means 7 and the oil temperature measurement can be provided even if the housing 4 does not have an appropriate place for providing the measurement chamber 12, the capacitance detection means 7 and the oil temperature measurement means 8. Measurement by means 8 can be performed. Other configurations and effects in the embodiment of FIG. 3 are the same as those of the first embodiment shown in FIG.

  FIG. 4 is an example in which a circulating oil supply system is used, that is, an example in which a circulating oil supply means 14 that performs the circulating oil supply to the lubricating oil reservoir 4 a of the housing 4 is provided. The circulating oil supply means 14 includes an oil circulation path 15 such as a pipe having both ends communicating with the lubricating oil storage tank 4 a and a pump 16 that circulates the lubricating oil 5 through the oil circulation path 15. The oil circulation path 15 communicates with the discharge port 15a at the bottom of the lubricating oil storage tank 4a and the middle height position or the upper oil supply port 15b of the lubricating oil storage tank 4a. Other configurations and effects are the same as those of the first embodiment shown in FIG.

  FIG. 5 shows that in the circulating oil supply system, a measurement chamber 12 communicating with the inside of the lubricating oil storage tank 4a is provided in a part of the housing 4, and the capacitance detecting means 7 and the oil temperature measuring means 8 are provided in the measurement chamber 12. It is the example installed so that the electrostatic capacitance and oil temperature of each may be measured. Also in this case, a stirring means 13 for stirring the lubricating oil 5 in the measurement chamber 12 may be provided. Other configurations are the same as those of the embodiment shown in FIG.

  FIG. 6 is an example in which a measurement chamber 12 is provided outside the housing 4 in the circulating oil supply system. The measurement chamber 12 is provided in the middle of the oil circulation path 15. The measurement chamber 12 is provided with capacitance detection means 7 and oil temperature measurement means 8 for measuring the capacitance and oil temperature of the internal lubricating oil, and stirring means 13 for stirring the lubricating oil 5 in the measurement chamber 12. Is provided. By providing the stirring means 13 in this manner, the capacitance can be measured stably and accurately, and the mixed water concentration can be accurately obtained.

In this embodiment, the inclined groove 17 is provided at the bottom of the lubricating oil reservoir 4a. The lower end portion of the bottom surface of the inclined groove 17 is used as a lubricating oil discharge port 15a, and the lubricating oil 5 is periodically drawn into the measuring chamber 12 serving as a reserve tank equipped with the stirring means 13 by the pump 16 and stored. Therefore, the mixed water concentration may be monitored by measuring the capacitance and the oil temperature. As a result, even if water having a specific gravity greater than that of the lubricating oil is separated, the water can be taken into the measurement chamber 12 and a higher mixed water concentration is measured. In other words, safety eyes can be monitored. This embodiment is the same as the first embodiment shown in FIG. 1 except for the matters specifically described.

  FIG. 7 shows a specific example of the rolling device. The rolling device in the figure is a speed increaser in a wind power generator. The rolling device main body 1 of this rolling device is provided with a planetary gear mechanism 23 serving as a primary speed increasing device and a secondary speed increasing device 24 between an input shaft 21 and an output shaft 22. The planetary gear mechanism 23 has a planetary gear 26 installed on a carrier 25 integral with the input shaft 21, meshes the planetary gear 26 with an internal ring gear 27 and a sun gear 28, and intermediately outputs a shaft integral with the sun gear 28. The axis 29 is used. The secondary speed increaser 24 includes a gear train that transmits the rotation of the intermediate output shaft 29 to the output shaft 22 via a plurality of gears 31 to 34. The rolling gears that constitute the planetary gear 26, the bearing 35 that supports the planetary gear 26, the ring gear 27, and the gear 31 of the secondary speed increaser 24 are included in the lubricating oil 5 of the lubricating oil storage tank 4a in the housing 4. Soaked in. The lubricating oil storage tank 4a is circulated by circulating oil supply means (not shown) including a pump and piping. The circulating oil supply means is not necessarily provided, and may be an oil bath lubrication type.

Next, a test method for obtaining an appropriate threshold value S set in the abnormality diagnosis means 10 in the oil lubrication type rolling device of each of the above embodiments will be described.
FIG. 8 is a conceptual diagram showing an example of a test apparatus used in this test method. The rolling / sliding fatigue life test apparatus includes a test apparatus main body 140, a test apparatus main body control device 141 for controlling the test apparatus main body 140, and a moisture concentration calculating means 142. The test apparatus main body 140 includes a test oil tank 101 in which the lubricating oil 5A is put in a state in which the rolling part simulation body 3 as a test object is immersed, and rolling that operates the rolling part simulation body 3 in the test oil tank 101. The component simulated body drive device 120, the syringe pump 104 that is a water injection means for injecting water into the lubricating oil in the test oil tank 101, and the capacitance measuring means that measures the capacitance of the lubricating oil 5A in the test oil tank 101. It has a certain capacitance meter 105 and a thermocouple 106 which is an oil temperature measuring means for measuring the oil temperature of the lubricating oil 5A in the test oil tank 101.
The rolling part simulation body 3 is a part that imitates a rolling part for testing by including a test piece of a rolling part material made of a steel material as a component. In the illustrated example, the rolling part simulated body 3 is a model of a thrust ball bearing which is a kind of rolling part, and is configured by providing a rolling element 3c composed of a ball between an inner ring 3a and an outer ring 3b. The outer ring 3b is a device under test. The outer ring 3b, which is a test object in the rolling component simulated body, has a cylindrical shape and an end surface thereof becomes a rolling surface. In addition, the rolling element simulated body 3 has a larger size of the rolling element 3c than a thrust bearing which is an actual rolling part. In the actual thrust bearing to be simulated, the rolling element is too small, and the maximum surface pressure of the contact surface is considerably increased by applying a slight load. Therefore, in the rolling component simulated body 3, the rolling element 3c is enlarged. The inner ring 3a is specially manufactured and used having a groove in which such a large rolling element 3c can roll.

  The moisture concentration calculating means 142 is a means for calculating the concentration of mixed water in the lubricating oil from the capacitance measured by the capacitance meter 105 and the oil temperature measured by the thermocouple 106 according to a predetermined relationship. The moisture concentration calculating means 142 has a relationship setting means 143 that defines the relationship between the capacitance, the oil temperature, and the mixed moisture concentration by a calculation formula, a table, etc., and from the inputted capacitance and the oil temperature, The mixed water concentration is calculated using the relationship set in the relationship setting means 143.

The test device main body control device 141 includes a rolling component simulated body control unit 144 that controls the rolling component simulated body drive device 120, a pump control unit 145 that controls the syringe pump 104, the test device main body 140, and other drive parts. And a control unit (not shown) for controlling. The test apparatus main body control apparatus 141 is a computer-type sequencer or numerical control apparatus, and includes a computer such as a personal computer and a program executed on the computer.
The moisture concentration calculating means 142 is composed of a computer such as a personal computer and a program executed on the computer. The moisture concentration calculating means 142 may be one using a computer constituting the test apparatus main body control apparatus 141 or one using a computer independent of the test apparatus main body control apparatus 141.

  This rolling / sliding fatigue life test method is performed as follows using the test apparatus having the above-described configuration. The rolling part simulated body 3 which is the test object is immersed in the lubricating oil 5A put in the test oil tank 101 and operated, and the rolling and sliding fatigue life of the outer ring 3b which is the test object constituting the rolling part simulated body 3 is operated. Perform the test. Here, the syringe pump 104 is used to inject water as a hydrogen source into the lubricating oil 5A, and the electrostatic capacity of the lubricating oil 5A measured by the capacitance meter 105 and the oil temperature measured by the thermocouple 106. The moisture concentration calculation means 142 is used to measure the mixed moisture concentration in the lubricating oil 5A.

In the test apparatus shown in the figure, an oil bath lubrication mechanism is used as a mechanism for putting the lubricating oil 5A into the test oil tank 101, and the mixed water concentration in the lubricating oil 5A in the test oil tank 101 is measured. The “oil bath lubrication mechanism” refers to a mechanism in which lubricating oil is stored in the test oil tank 101 and the rolling component simulated body is lubricated with the stored lubricating oil. The measured mixed water concentration is fed back to the syringe pump 104, and the mixed water concentration is controlled by changing the water injection amount. That is, the pump control unit 145 changes the amount of injection by the syringe pump 104 according to a predetermined rule according to the mixed water concentration output by the water concentration calculation means so that the mixed water concentration falls within a predetermined range. Let Further, a current is passed between the contact elements of the rolling component simulated body 3 (specifically, between the pair of race rings 3a and 3b) by the energizing means 147 to measure the metal contact rate. In the rolling part simulated body drive device 120, the main shaft 107 of the servo motor 107A is directly connected to the spindle 108 that is connected to the inner ring 3a that is a component of the rolling part simulated body 3 and operates the rolling part simulated body 3. To swing. The spindle 108 may have the rolling part simulated body 3 as one of the components. The main shaft 107 and the spindle 108 of the servo motor are connected by an insulating coupling 132. A ceramic rolling element bearing 133 is used as a support bearing for the spindle 108.
As described above, the rolling part simulation body 3 is a part simulating a thrust ball bearing in this embodiment, and the outer ring 3b serving as a test body is fixedly installed on an installation base (not shown) or the like, and the inner ring 3 a is fixed to the spindle 108.

  The spindle 108 and the ceramic rolling element bearing 133 constitute a head portion 146 of the rolling component simulated body driving device 120. The head unit 146 is a mechanism unit that operates one or one set of the rolling component simulated body 3 in the rolling component simulated body driving device 120. In this embodiment, only one head portion 146 is provided. However, a plurality of head portions 146 may be provided, and a plurality of rolling component simulated bodies 3 may be tested simultaneously.

  By the way, in the hydrogen brittleness resistance evaluation by the rolling and sliding fatigue life test, the penetration concentration of diffusible hydrogen into the steel cannot be controlled. It is an accelerated test under severe conditions and does not simulate actual machine conditions. Regarding the evaluation of hydrogen embrittlement resistance of steel materials, there is an evaluation by controlling the penetration concentration of diffusible hydrogen. In contrast, hydrogen embrittlement resistance evaluations such as the type of lubricating oil, additives to the lubricating oil, and surface treatment of the contact surface of the contact element are based on rolling slip fatigue where the intrusion concentration of diffusible hydrogen cannot be controlled as in this embodiment. It is necessary to evaluate with a life test. Therefore, the rolling slip fatigue life test simulating the actual machine as closely as possible effectively causes early damage due to hydrogen embrittlement, and the rolling element of this embodiment is ascertained according to the use conditions. The sliding fatigue life test method is effective. From the viewpoint of obtaining understanding from the user, it is desirable to carry out hydrogen embrittlement evaluation by a rolling sliding fatigue life test for steel materials.

In view of the usage conditions of various rolling parts that cause early damage due to hydrogen embrittlement, a rolling sliding fatigue life test having the following functions (1) to (5) is desirable. In addition, although the oil bath lubrication mechanism is used for each head portion in FIG. 8 so that the head portions 146 in the test apparatus do not affect each other, a circulating oil supply mechanism may be used. Even if it is an oil bath lubrication mechanism or a circulating oil supply mechanism, different heads can be tested under different conditions if they are provided in each head portion.
(1) Water as a hydrogen source is injected into the lubricating oil 5A.
(2) Monitor the mixed water concentration in the lubricating oil 5A with the capacitance and the oil temperature.
(3) The mixed water concentration monitored in (2) is fed back, and the mixed water concentration is controlled by changing the water injection amount. (4) Not only constant rotation speed and one-way rotation, but also acceleration / deceleration operation, rocking motion Can do.
(5) Energization is possible.

  As for the function (1), there is a method of periodically replacing the lubricating oil mixed with water, but it is inefficient because it takes time and cannot be replaced on holidays. Therefore, as in this embodiment, it is desirable to inject water with the syringe pump 104 or with a tube pump. The syringe pump 104 is suitable for microinjection. In the test apparatus of FIG. 8 in which the oil bath lubrication mechanism is used for the head portion 146, the water injection point is the test oil tank 101. However, when the circulation oil supply mechanism is used for the head portion 146, the test oil tank 101 or the circulation oil supply mechanism is used. Use a circulating oiling section.

  When providing the function (2), it should be noted that the saturated water concentration of mineral oil-based lubricant oil is at most 200 ppm by weight. The mixed water concentration can be measured by the capacitance and the oil temperature, but the capacitance meter 105 for measuring the capacitance is roughly classified into the following two types. One can be measured only up to a saturated water concentration or less, and the other can be measured even if the saturated water concentration is exceeded and a cloudy state occurs. The former type is more common, but some of the latter types can be measured even when the concentration of mixed water is 10% or more. As described above, the saturated water concentration of the mineral oil-based lubricating oil is at most 200 ppm by weight. In a rolling and sliding fatigue life test in which water-containing oil having a concentration of 200 ppm by weight is periodically replaced, no adverse effect on water is observed. Mineral oil based additive-free lubricating oil has a very small saturated water concentration, but synthetic oil-based lubricating oil and mineral oil also have a very high saturated water concentration depending on the type of additive. A capacitance meter that can measure the mixed water concentration below the saturated water concentration can be used to measure the saturated water concentration of the lubricating oil 5A. If the relationship between the mixed water concentration and the rolling and sliding fatigue life is obtained, the saturated water concentration inherent to the lubricating oil may be an index of hydrogen embrittlement resistance.

Regarding the function of (3), even when water of a certain concentration is mixed in the lubricating oil 5A and the rolling sliding life test is performed as a macroscopically closed system, the mixed water concentration is greatly reduced after about 3 hours. . Even when water is continuously injected into the lubricating oil 5A at a constant flow rate, it can be easily imagined that the mixed water concentration changes. For the function (1), water is injected as a hydrogen source. For this purpose, the water concentration monitored by the capacitance and oil temperature in the function (2) is fed back to change the water injection amount. It is desirable to keep the mixed water concentration within a predetermined range.

Speaking of the function (4), the actual rolling component 3 is not used at a constant rotational speed and in one-way rotation. Therefore, it is desirable that acceleration / deceleration operation and swing motion can be performed in addition to constant rotation speed and one-way rotation. For acceleration / deceleration operation, it is necessary to be able to set at least a pattern as shown in FIG. Acceleration (r _max -r _min ) / t _a , high speed r _max , holding time t _max at high speed, deceleration (r _max -r _min ) / t _d , low speed r _min , low speed Six parameters of the holding time t _min in the number of revolutions can be arbitrarily set, and this is used as one pattern to repeat acceleration / deceleration. In the oscillating motion, unlike the case of rotation, the vibration does not change greatly even if damage occurs. In the swing motion by the crank mechanism, the vibration is superimposed, so that even if damage occurs, it is difficult to detect by vibration. In order to be able to detect damage accurately by vibration, the main shaft 107 of the servo motor and the spindle 108 of the test mechanism having the rolling component simulated body 3 as one of the components are directly connected as shown in FIG. It is necessary to eliminate the superimposed vibration component as much as possible by performing the swing motion. Furthermore, it is necessary to increase the rigidity of the spindle 108 of the test mechanism as much as possible. As the swing motion condition, it is desirable that the swing angle and frequency can be set arbitrarily. When the servo motor main shaft 107 and the test mechanism spindle 108 are directly connected, it is difficult to give a speed change of a trigonometric function waveform like a crank mechanism. In order to make this possible, the servo motor amplifier may be controlled by a sequencer program.

The purpose of providing the function (5) is as follows.
One is to pass a weak current between the contact elements of the rolling element simulator 3 to measure the metal contact rate of the contact surface. The other is to apply a large current of about 1 A between the contact elements to wear the positive electrode side. By utilizing this phenomenon and making the test piece the positive electrode side, the newly formed metal surface can be positively exposed at the contact portion of the test piece, and the generation and penetration of hydrogen can be promoted. This is also disclosed in Non-Patent Document 9.

  In the rolling / sliding fatigue life test method using the test apparatus of FIG. 8, the servo motor is assumed on the assumption that all the functions (1) to (5) are satisfied and the rolling component simulated body 3 is oscillated. The main shaft 107 of 107A and the spindle 108 of the test mechanism are directly connected. When the swing operation is not required, it is preferable to drive the spindle 108 of the test mechanism with a belt with an inexpensive induction motor or the like rather than an expensive servo motor with a rated rotational speed of at most 3000 rpm. In this case, if a pulley mechanism is provided in the drive transmission diameter for transmitting the drive of the servo motor 107A to the spindle 108 and the pulley ratio is changed, the rotational speed of the spindle 108 of the test mechanism can be increased, and the speed difference of the acceleration / deceleration operation can be reduced. It is also effective to enlarge. In addition, when using a circulating oil supply mechanism for the head part 146, it is good to use a tube pump etc. with a comparatively quick oil supply speed. In this case, it is desirable to equalize the amount of lubricating oil so that the amount of lubricating oil in the test oil tank 101 is kept as constant as possible.

  The conceptual diagram of the test apparatus shown in FIG. 8 shows a case where the rolling component simulated body 3 is a thrust bearing type. However, since the rotation direction and the revolution direction of the steel ball are different also in the case of the thrust bearing type, Slip occurs at the contact surface between the test piece and the steel ball in the simulated part 3. Furthermore, in order to positively give a slip to the contact surface, the motion mechanism of the contact element may be devised. When the gear material is evaluated as the rolling part simulation body 3, since a larger slip acts on the gear, for example, the difference in the peripheral speed between the test piece and the object in contact with it is forcibly changed, and a large slip acts on the contact surface. It is necessary to devise it.

  10 and 11 show, as a conceptual diagram, another example of a test apparatus used in this rolling / sliding fatigue life test method. In the test apparatus of FIG. 10, a circulating oil supply mechanism 109 is used as a mechanism for putting the lubricating oil 5 </ b> A into the test oil tank 101. The circulation oil supply mechanism 109 here is configured by providing a circulation pump 111, a capacitance meter 105, and a thermocouple 106 in the middle of the circulation path 110. Even in this case, the capacitance meter 105 and the thermocouple 106 may be provided in the test oil tank 101 as shown in FIG.

  Here, when the mixed state of water into the lubricating oil 5A is not good, the capacitance value becomes unstable as the mixed water concentration increases. Therefore, it is desirable to measure the capacitance in a state where the lubricating oil 5A and water are well mixed. Therefore, in the test apparatus of FIG. 11, a reserve tank 112 is provided between the discharge port of the lubricating oil 5A of the test oil tank 101 and the circulation pump 111 in the test apparatus of FIG. Stirring is performed with a stirrer 113 or the like, and the capacitance and temperature are measured. The thermocouple 106 is provided in the reserve tank 112. In order to sufficiently mix the lubricating oil 5A and water, it is better to reduce the volume of the reserve tank 112 to increase the stirring effect. As a guide, the amount of lubricating oil is desirably 100 mL or less. It is further desirable that water having a specific gravity greater than that of the lubricating oil 5A is easily discharged from the test oil tank 101 and the reserve tank 112. Therefore, in the test apparatus of FIG. 11, the discharge ports for the lubricating oil 5A of the test oil tank 101 and the reserve tank 112 are the bottom corner portions 101a and 112a (shown with a circle in the figure). Further, the inside of each of the test oil tank 101 and the reserve tank 112 may be formed in a columnar shape, and groove-shaped recesses 101aa and 112aa that are recessed on the outer corner side that becomes so-called nuisance are provided continuously over the entire circumference of the bottom corners 101a and 112a. desirable. By these measures, it becomes easy to circulate an additive substance having a specific gravity larger than that of water.

In the test method using the test apparatus of FIGS. 8, 10, and 11, water is injected into the test oil tank 101 using the syringe pump 104. In the following, water-mixed oil in the test oil tank 101 is periodically replaced. A specific example of the rolling and sliding fatigue life test method performed in the above is shown.
Using a bearing steel SUJ2, a tapered outer ring test piece (ground finish after heat treatment, surface roughness Rq ≈ 0.03 μm on the inner raceway surface) 114 shown in FIG. The heat treatment was performed by heating in an RX gas atmosphere at 850 ° C. for 50 minutes, followed by tempering at 180 ° C. for 120 minutes. In the test, as shown in FIG. 12B, a tapered outer ring test piece 114, an inner ring (SUJ2 standard quenching and tempering product) 115 of an angular ball bearing 7306B, a steel ball (SUJ2 standard quenching and tempering product, 13 pieces). ) 116 and the cage 117 were combined to perform the rolling part simulation body 3. The reason why the outer ring test piece 114 is tapered is that when the steel ball 116 rotates with the contact angle, the steel ball 116 spins and slips on the contact surface with the outer ring test piece 114. When slipping occurs, the frequency of early damage due to hydrogen embrittlement increases.

FIG. 13 shows a schematic diagram of a test apparatus used in this specific test method. In the figure, the left side mechanism is the evaluation side 120a, and the right side is the dummy side 120b. In the figure, the tapered outer ring test piece 114 to be damaged is hatched. Only the axial load Fa = 2.94 kN was applied, and the inner ring 115 was rotated at 2733 min ⁻¹ . The lubricating oil used additive-free turbine oil VG100 (density 0.887 g / cm ^3, kinematic viscosity ^{100.9mm 2 /s@40℃,11.68mm 2 / s @ 100} ℃), it 200 wt ppm, 5 Weight percent pure water was mixed. 60 mL of water-mixed oil was added to the evaluation side, and the inlet (lower side) and outlet (upper side) of the lubricating oil were connected by a tube 118 to form a closed system. Since the flow of the lubricating oil is generated by the pump action in the direction indicated by the arrow in FIG. 12B, the water-containing oil is circulated and stirred. The test was conducted for 20 hours, and if no damage occurred during that time, it was replaced with a newly prepared water-mixed oil. The test for 20 h and the exchange of water-containing oil were repeated until damage occurred. Damage detection was performed with a vibrometer. The central cylindrical roller bearing 119 in the test apparatus shown in FIG. 13 is for applying a radial load, and is not related to this test.

  The maximum contact surface pressure between the outer ring test piece 114 and the steel ball 116 in the elastic Hertz contact calculation when only the axial load Fa = 2.94 kN is applied is 3 GPa. In the elastic Hertz contact calculation, the Young's modulus E and Poisson's ratio ν were E = 204 GPa and ν = 0.3, which are actually measured values of the SUJ2 standard quenching and tempering product. The oil film parameter between the tapered outer ring specimen 114 and the steel ball 116 in the elastohydrodynamic lubrication calculation ignoring water contamination is about 3. However, the surface roughness of the steel ball 116 was constant at an actual measurement value Rq = 0.178 μm. The calculated calculation life L10h of the tapered outer ring shape test piece 114 is 2611h when calculated by converting into a two-cylinder model. A method for obtaining L10h is disclosed in Non-Patent Document 10. However, the effect of slip was ignored.

  During the test with an initial mixed water concentration of 5% by weight, a small amount of lubricating oil was periodically sampled, and the mixed water concentration was measured by a coulometric titration method to examine the change with time. As a result, as shown in the graph of FIG. 14, the concentration of mixed water was significantly reduced after about 3 hours. Although it is a closed system as described above, it is macroscopic and it is impossible to completely eliminate the gap. It is thought that the water evaporated from a small gap that was not visually recognized. The results of this rolling and sliding fatigue life test are as shown in Table 1.

  In the case of 200 ppm by weight of water-mixed oil, all five test pieces were not damaged until 1000 h, and the test was terminated. On the other hand, with 5 wt% water-mixed oil, early damage on the order of 1/100 of the calculated life occurred in all five test pieces. The damage form was an internal origin type peeling starting from the surface layer. Although the maximum contact surface pressure of 3 GPa also acts on the SUJ2 steel balls 116, no peeling occurred. It is considered that the steel ball 116 has a larger effective load volume than the tapered outer ring test piece 114. It can be said that there is no influence of water when it reaches the upper limit of the saturated moisture concentration of the lubricating oil used this time, not reaching the service life. On the other hand, when a large amount of water is mixed, hydrogen is generated and penetrates into the steel, so that it is considered that the internal origin type peeling occurred very early. Table 1 shows L10, L50, and e (Weibull slope) obtained by applying a 2-parameter Weibull distribution to the life when a 5% by weight water-mixed oil is periodically replaced.

Next, a specific example of a rolling and sliding fatigue life test method performed by injecting a small amount of water into the lubricating oil 5A in the test oil tank 101 at a constant flow rate as in the test apparatus of FIGS.
The test piece 114 shown in FIG. 12 and the test apparatus shown in FIG. 13 are used as in the case of the test method, the load conditions and the rotation speed are the same, and 60 mL of the same lubricating oil (without water mixing) is added. (Lower side) and outlet (upper side) were connected by a tube 118 to form a closed system. Simultaneously with the start of the test, continuous injection of pure water was started from the middle of the tube 118 by the syringe pump 104 (FIG. 8). The injection rate of pure water was 0.5 mL / h. In this case, the time-dependent change of the mixed water concentration was not measured, but it can be easily imagined from this result that the mixed water concentration also changes in this case. The results of this rolling and sliding fatigue life test are as shown in Table 2.

  In this case as well, all of the six test pieces suffered early damage with the same life as when the 5 wt% water-mixed oil, which was the previous test method, was periodically replaced. In this case as well, the damage form was an internal origin type peeling starting from the surface layer. In this case, the maximum contact surface pressure of 3 GPa also acts on the SUJ2 steel balls 16, but no peeling occurred. Table 2 shows L10, L50, and e (Weibull slope) obtained by applying the lifetime to the 2-parameter Weibull distribution.

Next, a specific example of the measurement of the saturated water concentration and the mixed water concentration of the lubricating oil by the capacitance meter 105 will be described.
As described above, the moisture concentration in the lubricating oil can be measured by the capacitance and temperature, and the capacitance meter 105 used therefor is roughly classified into the following two types. One is capable of measuring only up to a saturated water concentration or less, and the other is capable of measuring even when the saturated water concentration is exceeded and a cloudy state occurs.
First, the saturated moisture concentration of the lubricating oil was measured using a capacitance meter 105 that can measure only up to a saturated moisture concentration. Lubricating oil is VG100 additive-free turbine oil used in the specific example of the rolling and sliding fatigue life test. As schematically shown in FIG. 15 (A), lubricating oil was put into a container 121 (for example, the test oil tank 101 in the test apparatus of FIG. 8) to which a capacitance meter 105 was attached, and a silica gel container was provided. The top lid 122 was attached, heated to 110 ° C. while stirring with a magnetic stirrer 113 capable of adjusting the temperature, and left for 1 hour. During this time, a trace amount of water mixed in the oil was evaporated and adsorbed onto silica gel. Thereafter, as schematically shown in FIG. 15B, pure water was injected at a constant rate of 0.05 mL / h using the syringe pump 104 while being kept at 40 ° C. FIG. 16 is a graph showing the change over time of the capacitance at that time. The capacitance meter 105 outputs a value of 0 to 1 as the water activity. “0” is when the mixed water concentration is zero, and “1” is when the mixed water concentration is equal to or higher than the saturated water concentration. As shown in FIG. 16, since the measured value becomes 1 at 167 ppm by weight, the value becomes the saturated water concentration. If the relationship between the mixed water concentration and the rolling and sliding fatigue life is examined, the saturated water concentration inherent to the lubricating oil may be an index of hydrogen embrittlement resistance.

Next, using a capacitance meter 105 that can be measured even when the saturated moisture concentration is exceeded and white turbidity is obtained, the capacitance is measured by changing the moisture concentration in the lubricating oil. Lubricating oil is VG100 additive-free turbine oil used in the specific example of the rolling and sliding fatigue life test. As schematically shown in FIG. 17A, 70 to 80 mL of lubricating oil is put into a 100 mL beaker 131 (for example, the test oil tank 101 in the test apparatus of FIG. 8), pure water is mixed, and It stirred in the state hold | maintained at 33 degreeC with the magnetic stirrer 113 which can adjust temperature until it mixes. Thereafter, as shown in a schematic diagram of FIG. 17B, a capacitance meter 105 was attached and the capacitance was measured. The results are shown graphically in FIG. From this graph, it can be seen that a linear relationship between the mixed water concentration and the capacitance with good correlation was obtained. Further, the capacitance of the lubricating oil without water mixing was measured while raising the temperature from about 25 ° C. (room temperature) to about 115 ° C. The results are shown graphically in FIG. From this graph, it can be seen that a linear relationship between oil temperature and capacitance with good correlation was obtained. As can be seen from the graphs of FIGS. 18 and 19, the capacitance depends on the mixed water concentration and the oil temperature. In the range of the mixed moisture concentration and temperature that can change, if a plurality of relationships as shown in FIGS. 18 and 19 are obtained and the objective variable is a function of the mixed moisture concentration, the dependent variable is the capacitance, and the oil temperature, the capacitance And the moisture concentration can be determined from the oil temperature.
In obtaining the calibration curves as shown in FIG. 18 and FIG. 19, it is desirable to measure not only the new oil but also the used oil with different usage conditions.

  As described above, according to the rolling and sliding fatigue life test method of this embodiment, the rolling component simulated body 3 including the test object as a component is immersed in the lubricating oil 5A stored in the test oil tank 101 and operated. Since water is injected into 5A and the mixed water concentration in lubricating oil 5A is measured by electrostatic capacity and oil temperature, the disturbance is as small as possible, and the actual machine is faithfully simulated as much as possible. Early damage is caused efficiently, and the countermeasure elements according to the use conditions of the rolling part simulated body 3 can be identified.

DESCRIPTION OF SYMBOLS 1 ... Rolling device main body 2 ... Control device 3 ... Rolling component simulation body 4 ... Housing 4a ... Lubricating oil storage tank 5 ... Lubricating oil 6 ... Contaminated water concentration monitoring device 7 ... Capacitance detection means 8 ... Oil temperature measuring means 9 ... moisture concentration calculating means 10 ... abnormality diagnosing means 11 ... mixed water concentration detecting means 12 ... measuring chamber 13 ... stirring means 16 ... inclined groove (means for facilitating discharge of an additive having a high specific gravity)
DESCRIPTION OF SYMBOLS 101 ... Test oil tank 104 ... Syringe pump 105 ... Capacitance meter 106 ... Thermocouple 111 ... Circulation pump 112 ... Reserve tank 113 ... Stirrer 142 ... Water concentration calculation means 141 ... Test apparatus main body control apparatus 146 ... Head part S ... Threshold value

Claims (15)

In the oil lubrication type rolling device, a mixed water concentration monitoring device for monitoring the mixed water concentration in the lubricating oil is provided, and the mixed water concentration monitoring device detects the capacitance and the oil temperature in the lubricating oil, respectively. Capacitance detecting means and oil temperature measuring means, and a moisture concentration calculating means for detecting the mixed water concentration from the capacitance and oil temperature detected by these capacitance detecting means and oil temperature measuring means according to a predetermined rule And a capacitance and oil temperature measurement chamber in which the capacitance detection means and the oil temperature measurement means are installed is provided inside or outside the housing of the rolling device. the lubricant provide a stirring means for stirring, said moisture concentration calculating means, an oil lubrication system rolling device according to claim stirred and to detect contamination water concentration in the lubricant and lower child with the stirring means.   2. The oil lubrication type rolling device according to claim 1, further comprising a lubricating oil storage tank that performs oil bath lubrication.   2. The oil lubrication type rolling device according to claim 1, further comprising circulating oil supply means for performing circulating oil supply. 4. The oil lubrication type rolling device according to any one of claims 1 to 3, wherein the amount of lubricating oil accumulated in the capacitance and oil temperature measurement chamber is 100 mL or less and the variation is ± 5 mL or less. 5. The apparatus according to claim 1, further comprising means for facilitating discharge of water and additives having a specific gravity greater than that of the lubricating oil from the rolling device and the capacitance and oil temperature measurement chambers. Oil lubrication type rolling device. In any one of claims 1 to 5, the mixed water concentration calculated in moisture concentration calculating means is compared with the threshold value, it provided the abnormality diagnosis means for diagnosing an abnormal if exceeding a threshold Oil lubrication type rolling device. The oil lubrication type rolling device according to claim 6 , wherein the threshold value of the abnormality diagnosing means is determined by injecting water into the lubricating oil, measuring capacitance and oil temperature, and mixing. Monitor the moisture concentration, feed it back, and determine the threshold value of the contaminated moisture concentration determined by the rolling-slip fatigue life test that controls the amount of water injected to keep the contaminated moisture concentration within a certain range. An abnormality diagnosis threshold value setting method for an oil lubrication type rolling device, wherein a threshold value is set as a threshold value in the abnormality diagnosis means. The oil lubrication type rolling device according to claim 6 , wherein the threshold value of the abnormality diagnosing means is determined, and a rolling-slip fatigue life test in which a slip occurs on a contact surface by a motion mechanism between contacting elements. An abnormality diagnosis threshold value setting method for an oil lubrication type rolling device, wherein the threshold value of the mixed water concentration is obtained by the method and the obtained threshold value is set as a threshold value in the abnormality diagnosis means. The oil lubrication type rolling device according to claim 6 , wherein the threshold value of the abnormality diagnosing means is determined, and a rolling sliding fatigue life test forcibly causing a slip on a contact surface between contacting elements. An abnormality diagnosis threshold value setting method for an oil lubrication type rolling device, wherein the threshold value of the mixed water concentration is obtained by the method and the obtained threshold value is set as a threshold value in the abnormality diagnosis means. 7. The oil lubrication type rolling device according to claim 6 , wherein the threshold value of the abnormality diagnosing means is determined by the rolling sliding fatigue life test in which the threshold value is rotated at a constant rotational speed in one direction until damage occurs. An abnormality diagnosis threshold value setting method for an oil lubrication type rolling device, wherein a concentration threshold value is obtained and the obtained threshold value is set as a threshold value in the abnormality diagnosis means. 7. The oil lubrication type rolling device according to claim 6 , wherein the threshold value of the abnormality diagnosing means is determined by a rolling-slip fatigue life test in which acceleration / deceleration operation is performed until damage occurs. An abnormality diagnosis threshold value setting method for an oil lubrication type rolling device, wherein a value is obtained and the obtained threshold value is set as a threshold value in the abnormality diagnosis means. 7. The oil lubrication type rolling device according to claim 6 , wherein the threshold value of the abnormality diagnosing means is determined by a rolling-slip fatigue life test in which rocking motion is performed until damage occurs. An abnormality diagnosis threshold value setting method for an oil lubrication type rolling device, wherein a value is obtained and the obtained threshold value is set as a threshold value in the abnormality diagnosis means. 7. The oil lubrication type rolling device according to claim 6 , wherein the threshold value of the abnormality diagnosing means is determined, and an overlapping vibration component is preferably used so that damage can be accurately detected by vibration by a swing motion. In order to eliminate this, the threshold value of the mixed moisture concentration is determined by a rolling and sliding fatigue life test of a mechanism that directly connects the spindle of the servo motor and the spindle of the test section, and this threshold value is set as a threshold value in the abnormality diagnosis means. Abnormality threshold setting method for oil lubricated rolling device. The oil lubrication type rolling device according to claim 6 , wherein the threshold value of the abnormality diagnosing means is determined, and current is passed between contact elements with the damage target as the positive electrode side to promote wear of the damage target. Therefore, a ceramic rolling element is used for the spindle support bearing, and a threshold value of the mixed moisture concentration is obtained by a rolling sliding fatigue life test that insulates the motor and the spindle of the test section. An abnormality diagnosis threshold value setting method for an oil lubrication type rolling device that is set as a threshold value in a diagnostic means. 7. The oil lubrication type rolling device according to claim 6 , wherein the threshold value of the abnormality diagnosing means is determined, and in addition to constant rotation speed and one-way rotation, acceleration / deceleration operation and swing motion are possible. An abnormality diagnosis threshold value setting method for an oil lubrication type rolling device, wherein a threshold value of mixed water concentration is obtained by a rolling / sliding fatigue life test device, and the obtained threshold value is set as a threshold value in the abnormality diagnosis means.

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