JP2012203418A - Method for calculating remaining lifetime of mechanical element component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a mechanical element component to be determined to be reusable or not without depending on an expert.SOLUTION: An IC tag into which identification information including at least one of a type, a production period, a production lot, and a production history of a mechanical element component is recorded and from which the identification information can be read from the outside by an electromagnetic method is attached to the mechanical element component. Inspection items corresponding to the identification information and determination criteria for them are recorded in a storage unit of an inspection device capable of reading the IC tag, and inspection items corresponding to the mechanical element component are displayed on a display unit, and result information is accepted from an input unit and are compared with the determination criteria to display whether the mechanical element component is reusable or not on the display unit.

Description

  The present invention relates to a method for calculating a remaining life in maintenance of machine element parts. In particular, the present invention relates to a method capable of calculating a remaining life with high accuracy even in a situation where there is no maintenance specialist such as a site where machine element parts are used.

  All machines are inevitably worn and deteriorated when used. Using machine parts that have reached the end of their life may cause malfunctions or accidents. Therefore, in order to use continuously, detailed diagnosis and appropriate maintenance are indispensable, and it is desirable to replace parts that have reached the end of their life or have a short remaining life at the maintenance stage. However, the more complex the machine, the greater the number of components that make up the machine element parts. It was actually difficult to keep track of and manage the manufacturing conditions and manufacturing time for all of the enormous number of components and perform diagnosis and maintenance suitable for each component. This is because even if the components are of the same type, the properties differ depending on the manufacturing conditions, and the remaining life may not be determined based on the same standard.

  On the other hand, as a method for managing the element parts of such a machine, a method of embedding an IC tag in each element part has been studied. IC tags not only read out unique identification information. Writing is also possible, and the attributes and conditions of the manufacturing process can be recorded and read later as information.

  For example, in Patent Document 1, the material, forging, and heat treatment conditions such as forging and heat treatment for each component part constituting an element part are recorded on an IC tag and attached to one of the component parts at the time of shipment. Describes a quality control method for machine element products in which information recorded on IC tags is read at any time to confirm materials and manufacturing conditions. According to this, even after shipment, by reading the IC tag, it is possible to grasp the material and processing conditions, and therefore, the cause investigation in the case where a failure occurs can be easily performed.

  On the other hand, Patent Document 2 describes a method of diagnosing the remaining life of a rolling bearing by analyzing a value measured using an acceleration sensor.

JP 2006-53670 A Japanese Patent No. 45004065

  However, the method described in Patent Document 1 is extremely effective when a manufacturer or a specialized institution inspects, but in the case of a machine composed of a plurality of parts, a specialist for each individual part is always on site. I don't mean. For this reason, it is necessary to call a specialist for each component part constituting the machine or send it to the manufacturer of the component part for diagnosis, and the machine cannot be used during the movement. It was a heavy burden for me. In particular, in the case of machine element parts used in places such as remote places where transportation is difficult or transportation costs cannot be borne, diagnosis itself may be impossible.

  On the other hand, the remaining life diagnosis method described in Patent Document 2 is specialized for rolling bearings. This is effective for rolling bearings, but the method for diagnosing the remaining life varies depending on the type of the machine element part, so this method cannot be applied to other machine element parts as they are. However, even in the case of a rolling bearing, since the model number and manufacturer are not known on the spot, diagnosis may be difficult and another measure may be taken. 3. Conventionally, in order to solve this, it has been necessary to centrally manage the model numbers and manufacturer names of machine element parts and to refer to them at the time of inspection.

  Therefore, the present invention is easy to use at or near the site of use, without sending it to a place where manufacturers and maintenance specialists are stationed, even if individual machine element parts are not strictly managed. The purpose is to enable diagnosis of remaining life with high certainty.

This invention
An IC tag capable of recording identification information including at least one of the type, production time, production lot, and production history of the machine element part and reading the identification information from the outside by an electromagnetic method. Attached,
When calculating the remaining life time that is an estimated value of the remaining usable time or the remaining usage time of the machine element component that is inspected after using the machine element component,
A communication unit capable of reading the identification information of the IC tag, a storage unit storing a check item corresponding to the identification information and a determination formula for calculating the remaining life time from the result information on the check item, and the inspection A display unit capable of displaying an item and the remaining life time, an input unit capable of inputting the result information, and a control unit for calculating the remaining life by calculating the determination formula based on the result information input from the input unit With an inspection device having
The identification information contained in the IC tag of the machine element part is read by the communication unit, inspected according to the inspection item displayed on the display unit, and the result information obtained by executing the inspection item is input. The above-mentioned problem has been solved by inputting into the display unit and displaying the remaining life on the display unit.

  That is, the main point of the present invention is that an inspection device capable of calculating the remaining life of machine element parts even in a place where an expert is not present and an environment therefor are prepared. In this inspection device, the inspection items corresponding to the identification information of the machine element parts and the judgment formula for calculating the remaining life from the result information of the inspection items are recorded for the machine element parts of the required genre. It is. When a user reads an IC tag of a machine element part with this inspection device, an inspection item corresponding to the identification information from the identification information of the IC tag, that is, an inspection item suitable for the machine element part is displayed on the display unit of the inspection device. Is displayed. Even if the user does not have technical knowledge about the model number or lot of the machine element parts, the user may inspect according to the displayed contents. If the user inputs the result information to the inspection device after the inspection, the inspection device substitutes the result information into the judgment formula and displays the obtained remaining lifetime on the display unit. Thereby, it is not necessary for a non-professional user to make a difficult decision, and the remaining life time can be known based on a uniform standard, thereby easily determining whether or not the use should be continued.

  Note that the judgment formula may be a single formula, a plurality of formulas, or a complex conditional formula including conditional branches for selecting a plurality of formulas and conditions. Good.

  The inspection items may include not only items to be inspected on the spot but also input of a use history up to the time of the inspection. In other words, by entering usage information such as the usage time, usage environment, and usage conditions of the machine element parts, it is possible to provide a more reliable remaining lifetime including elements that cannot be judged simply by inspection at that moment. Calculation is possible.

  When there are multiple inspection items instead of one and one inspection item is displayed, it is possible to accept the input of the result information for the one inspection item, and the input of the result information for the one inspection item. , Display the other inspection items that follow on the display unit, wait for the input of the result information for all the inspection items, and execute a judgment formula that includes the result information for all the inspection items as a variable By doing so, it is possible to perform inspections as instructed in order without causing the user of the present invention to get lost, so that more detailed and reliable inspection can be performed while being simple.

  On the other hand, when there are multiple inspection items, the display unit can display the plurality of inspection items at the same time, and the result information on the plurality of inspection items can be selected and input from the input unit. The determination formula may be executed similarly after waiting for the input of the result information for the plurality of inspection items.

  In addition, it is beneficial to write the inspection item, the usage information, the remaining life time, etc. in the IC tag after calculating the remaining life time, because the contents can be referred to later. It is. This is because, in the case of reuse, the past history up to that time can be referred to later, and even when the reuse is stopped, it is possible to know later why the machine element part cannot be reused. The inspection items, the use information, and the remaining life time may not be all, and one or a part of them may be selected as necessary.

  The inspection device preferably has a battery and is portable. The remaining life can be easily calculated even in places where there is no power supply or where the power supply is secured. This is particularly effective when diagnosing machine element parts used in remote environments.

  On the other hand, the inspection device may have a network function. Accordingly, when the identification information, the use information, the remaining life time, or a plurality of them are transmitted to the separately provided machine element parts management database and registered, the machine element parts management database is referred to. Therefore, it is possible to centrally manage whether or not the machine element part is currently in operation and the remaining remaining life, and store detailed information that does not fit in the IC tag. Can also be used. Order management etc. can also be performed from the average remaining life time of the machine element parts.

  Also, if the inspection device has a network function, based on the identification information read by the communication unit, even if the inspection item and a determination formula using the inspection item are not recorded in the inspection device in advance. It can transmit to the inspection item management database provided separately, can receive the said required inspection item corresponding to the said identification information recorded there, and the judgment formula corresponding to it, and can calculate remaining life time. As a result, the number of target machine element parts can be increased almost without limitation, and machine element parts manufactured after the inspection apparatus is manufactured can also be handled.

  When the machine element part is further composed of a plurality of component parts, not only the machine element part itself but also each component part has an IC tag, the calculation of the judgment formula for all of the respective component parts By performing the above, it is possible to perform detailed and reliable calculation of the remaining lifetime.

  As a machine element part suitable for performing diagnosis and calculating the remaining life time in this way, for example, a bearing device can be cited. An IC tag is attached to each of a plurality of component parts such as a seal ring and a starter wheel constituting the bearing device, and it is preferable that an inspection suitable for the shape and model number of each component part and calculation of remaining life time can be performed.

  When reading each IC tag for the machine element part composed of a plurality of component parts, even if the IC tag is covered with other component parts when disassembled for each of the component parts, Reads, diagnoses and calculates remaining life time without problems.

  When the mechanical element part has a metal part, it is necessary to use an IC tag that can be read and written even if it is attached to or embedded in the metal part.

  With this invention, when diagnosing machine element parts and calculating the remaining life time, users can easily make highly reliable diagnoses on site without calling for experts or returning them to the manufacturer. It can be performed, and it can be determined with high accuracy whether or not reuse is possible.

Schematic of the first embodiment for carrying out the present invention Configuration diagram of a first embodiment for carrying out the present invention Example diagram when machine element parts have IC tags for each structural part Example of a flowchart for carrying out the present invention Flowchart showing an example when the calculation formula for the remaining life time varies depending on conditions for rolling bearings

Embodiments of the present invention will be described below with reference to the drawings.
The present invention attaches an IC tag 12 in which identification information is recorded to the machine element part 11, reads the identification information from the inspection device 21, makes the machine element part 11 diagnose according to the instruction of the inspection device 21, and This is a method for calculating the remaining life of a machine element part by executing a judgment formula for calculating the remaining life time of the machine element part 11 and displaying the remaining life time. FIG. 1 is a schematic diagram of a first embodiment of the present invention, and FIG. 2 is a conceptual diagram of an IC tag 12 and an inspection device 21. Here, a roller bearing is taken as an example of the machine element part 11. An IC tag 12 is provided at one location facing the outside of the inner ring.

  First, the IC tag 12 attached to the machine element part 11 will be described. In the IC tag 12, the control unit 43 can read information stored in the storage unit 42 and write information into the storage unit 42 by electromagnetic induction caused by the communication unit 41 receiving an external radio wave. A so-called passive IC tag can be used. It is not suitable to use the active type that requires a power supply because it is attached to the machine element part 11 for a long period of time and needs to be read and written only during maintenance. Further, in order to facilitate reading, it is desirable that communication is possible using radio waves in a range of several centimeters to 1 meter, not a contact type.

  When the machine element part 11 is manufactured, identification information 50 including at least one of the type, the manufacturing time, the manufacturing lot, and the manufacturing history is recorded on the IC tag 12. These may be recorded as text data as they are, or may be recorded as a code standardized with the inspection device 21 or may be recorded as a model number. In any form, it is only necessary that the inspection device 21 can select an appropriate inspection item 51 for the machine element part 11 by referring to the identification information 50.

  Further, it is preferable that n spaces are provided in the storage unit 42 of the IC tag 12 and information such as result information 53, remaining life time 54, usage information 55, and the like described later can be written.

  In the case where the machine element part 11 has a metal part, when the normal IC tag 12 is used, there are cases where normal reading and writing cannot be performed due to interference of magnetic lines of force on the metal part. For this reason, when the machine element part 11 has a metal part and the IC tag 12 is attached to a place where it can interfere with it, the IC tag is read even if it is affixed or embedded in the metal part, It is necessary to use a model that supports writing.

  Next, the inspection device 21 will be described. The inspection device 21 is a device including at least a communication unit 32, a storage unit 33, a display unit 34, an input unit 35, and a control unit 31 that controls them.

  The communication unit 32 is a device capable of communicating with the communication unit 41 of the IC tag 12 and includes a coil that generates radio and a control circuit therefor.

  The storage unit 33 is composed of a non-volatile memory, and includes a determination formula 52 for calculating the remaining life time from the identification information 50 about the machine element part 11 to be diagnosed, the corresponding check item 51 and the result information 53. It is recorded. Using the identification information 50 as a key, the control unit 31 searches for and reads an inspection item 51 suitable for the condition of the machine element part 11, and also reads a judgment formula 52 for the inspection item 51.

  The inspection items 51 are recorded in the form of texts and drawings, and are displayed on the display unit 34 described later to convey a specific inspection method to the user. Basically, since this is an inspection for calculating the remaining life, it is preferably a nondestructive inspection including confirmation of the presence or absence of what can be visually recognized from the appearance. Items that can be confirmed from the appearance with the naked eye or using a magnifying glass include, for example, the presence or absence of peeling, seizure, cracking, chipping, breakage, rust, indentation, electrolytic corrosion, wear, etc. Yes, it may be difficult to assign to the judgment formula. For this reason, it is more preferable that it is a quantitative nondestructive inspection. For example, it may be substituted into the judgment formula as a value such as the number of corresponding portions or surface area. In addition, there may be a unique inspection item for each machine element part 11. For example, if the machine element part 11 is a bearing, breakage, smearing, galling, fretting, creep, peeling, etc. of the cage may be present from the appearance. It is a matter that can be confirmed. In addition, nondestructive inspection using inspection equipment includes methods for confirming, analyzing and measuring the above-mentioned items to be visually recognized by image processing after photography, dimension measurement, weight measurement, hardness measurement, rotational tone, X Measurements such as line photography, magnetic particle inspection, fluorescent inspection, and overcurrent inspection are also possible.

  Regarding the inspection items 51, it is desirable that the contents displayed on the display unit 34 are not limited to the words as described above but can be clearly shown by sentences and drawings. For example, when the machine element part 11 is a bearing, the specific instruction content is “Please confirm that the outer ring is not rusted and measure the weight in mg”. The content may be a measurement of weight and length that does not require a specialized device, or a specialized device such as an X-ray photographic device or a spectrum analyzer may be used to analyze the output result. In particular, when the present invention is implemented, it is preferable that only the inspection item 51 that can be diagnosed without requiring a specialized device is used for a non-expert user to implement the present invention in an environment close to the site.

  The determination formula 52 is a modeled calculation formula that can substitute the result information 53 obtained according to the measurement content indicated by the inspection item 51 and calculate the remaining life time. is there. The optimum content of the judgment formula 52 differs depending not only on the type of the machine element part 11 but also on the manufacturer and in some cases on the production lot. In this invention, the inspection device 21 uses the identification information 50 as a key. The judgment formula 52 suitable for the machine element part 11 related to the identification information 50 held by itself or in the database on the network and the inspection item 51 necessary for it are called.

  These contents may be recorded in the storage unit 33 in the form of one or more tables corresponding to the identification information 50. An inspection item 51 for obtaining a determination formula 52 to be used and result information 53 (including use information 55) to be substituted from the identification information 50 (here, the part model number) received from the IC tag 12. get. The inspection items 51 include descriptions of measurement methods, measurement conditions, measurement devices, and the like. However, it is not necessary to describe all of them, and it may be specified by a JIS number depending on the user layer using the inspection device.

    The usage information 55 includes, for example, diagnostic conditions at the time such as usage time of the machine element part 11, usage conditions such as load during use, rotation speed during use, temperature conditions during use, and frequency of use. It is not the content, but the specific content of the use before the diagnosis.

  The display unit 34 may be a general liquid crystal display. When the inspection item 51 includes not only text data and drawing data but also audio data, the display unit 34 may include a speaker. Here, the user performs an inspection in accordance with the inspection item 51 displayed on the display unit 34.

  The input unit 35 needs to be capable of inputting at least Yes / No judgment, such as a touch panel, a button, and a keyboard, and more preferably capable of inputting numerical values and characters. A user inputs result information 53 such as a numerical value of a measurement result obtained according to the inspection item 51 from the input unit 35.

  When the result information 53 (including the usage information 55) is input from the input unit 35, the control unit 31 assigns the remaining life time to the judgment formula 52 that has been read in advance or read at that time. calculate.

  If there is a margin in the display area of the display unit 34, it is possible to display a plurality of inspection items 51 at the same time and accept input. However, from the viewpoint of preventing erroneous input, one inspection item 51 is provided. It is preferable to display one.

  The remaining life time 54 calculated in this way is displayed on the display unit 34, and the diagnosis process is temporarily ended. As a result, the user can know the remaining remaining life time 54 of the machine element part 11. The remaining life time 54 may be a time that can be actually used or a time limit that can be used regardless of use or not, and depends on the type of the machine element part 11.

  Thereafter, the result information 53, the remaining life time 54, and the usage information 55 may be written to the IC tag 12 of the machine element part 11 as necessary. In particular, if the remaining life time 54 is written, it is possible to read and know later how much the machine element part 11 can be used. In particular, this is useful for preventing an error in which the machine element part 11 whose remaining life time 54 becomes 0 and cannot be reused is used again. Further, if the result information 53 and the usage information 55 are recorded, it can be left as a use history and a diagnosis history, and these can be used as precondition values in the diagnosis for the second and subsequent reuses. .

  Further, other functions will be described. When the inspection device 21 includes the network function unit 37, the storage unit 33 may be a volatile memory. In this case, the inspection items 51, the judgment formulas 52, etc. are not recorded in the normal state, but are stored in the inspection item management database 71 provided outside via the network 81 through the network function unit 37 as necessary. It is preferable to transmit the identification information 50, download the inspection item 51, the judgment formula 52, etc. corresponding to the identification information 50, temporarily store them in the storage unit 33, and execute the same judgment as described above. Thereby, it can respond also about the machine element components 11 manufactured after the inspection apparatus 21 was sold. The network function unit 37 itself may be an Internet connection function through a wired LAN or a wireless LAN or a mobile communication function as long as it can access the inspection item management database 71 existing on the network. Good. On the other hand, the inspection item management database 71 may be managed by a manufacturer or sales agent of the machine element parts 11 to provide services to the purchaser.

  Further, when the inspection device 21 has the network function unit 37, the machine element component management provided on the network 81 with the use information 55 and the remaining life time 54 together with the identification information 50 during or after the determination of reuse. It is preferable to send it to the database 61. In the machine element parts management database 61, the transmitted information is registered in a table, and can be called up as necessary. By searching the machine element / parts management database 61, for example, a company to which the user belongs can obtain information such as how much the machine element / parts 11 owned by the company are currently used.

  These databases may be software recorded and executed by a server that can be used on the network 81.

  As another function, the inspection device 21 preferably includes a battery 39. As a result, it is possible to easily determine whether or not it can be reused at a place near the site where there is no power source.

  The determination in the above embodiment refers to the inspection items 51 for all of the components from the identification information 50 recorded in the IC tag 12 even if the machine element component 11 is composed of a plurality of components. The remaining life time 54 may be calculated in a lump. Further, the remaining lifetime 54 can be calculated for each individual component, and maintenance may be performed in which only the component whose remaining lifetime 54 is exhausted is replaced.

  Further, depending on the properties of the machine element part 11, the remaining life time 54 may not be calculated by only one judgment formula 52 but may be calculated in a multi-step manner. That is, after calculating the first judgment formula 52 for diagnosing the state of the machine element part 11, the inspection item 51 and the judgment formula 52 for another judgment formula 52 selected by the result are newly read. Then, the inspection item 51 is displayed on the display unit 34, the input of the result information 53 and the usage information 55 is received in the same manner as described above, and the judgment formula 52 is calculated. That is, as the above-described determination formula, not only the determination formula 52 for directly calculating the remaining life time 54 but also a determination formula used in the determination stage, which is a previous stage for calculating the remaining life time 54, and a usage expression. Also includes conditional branching for selection. By changing the judgment formula used when the remaining life time is sufficiently long or short, it is possible to improve the accuracy when the remaining life time is short, or to perform the optimal inspection depending on the state in which the machine element part 11 is in a fault. The content can be changed.

  An embodiment in which the machine element part 11 includes a plurality of component parts, and each of the component parts individually has an IC tag will be described. FIG. 3 shows a cross-sectional view of a machine element component 11 </ b> A that is a roller bearing including an inner ring 13, an outer ring 14, a cage 15, and rolling elements 16. IC tags 12a, 12b, and 12c are attached to the inner ring 13, the outer ring 14, and the retainer 15, respectively.

  When determining whether or not the machine element part 11A can be reused, for example, the inspection device 21 first reads the identification information 50a to 50c for all of the IC tags 12a, 12b, and 12c. At this time, since the IC tag 12c is in a place where reading between the inner ring 13 and the outer ring 14 is difficult, it is preferable to disassemble and read the roller bearing once. The inspection device 21 has a correspondence table with inspection items for the identification information 50a to 50c recorded in the respective IC tags 12a to 12c in the storage unit 33 or downloaded from the network and temporarily held. is doing. In addition, the inspection device 21 sequentially displays the inspection items 51 for all the identification information 50a to 50c, accepts input of all the result information 53, and temporarily holds it in the storage unit 33. When all the result information 53 is finally input, the result information 53 temporarily stored in the storage unit 33 is substituted into the judgment formula 52 to calculate the remaining life time 54. Of course, at this time, the usage information 55 may be included in the result information 53. The remaining life time 54 calculated finally is displayed on the display unit 34. Further, if necessary, after writing the usage information 55 and the remaining lifetime 54 to the individual IC tags 12a to 12c, they are assembled and reused if reusable.

  Next, an example of a procedure for calculating the remaining life time according to the present invention will be described with reference to a flowchart. A flowchart of this example is shown in FIG.

  First (S101), the user brings the inspection device 21 close to the IC tag 12 of the machine element part 11 and reads the identification information 50 (S102). The control part 31 searches the table in the memory | storage part 33 by using the read identification information 50 as a key, and reads the inspection item 51 and the judgment formula 52 (S103). Here, the inspection item 51 includes information on usage information 55 for which input is requested.

  First, the control unit 31 causes the display unit 34 to display a message that prompts input of the usage information 55 among the inspection items 51 (S104). When the usage information 55 corresponding to the displayed information is input from the input unit 35 (S105), the control unit 31 determines whether the data has no problem in terms of format (S106). For example, if a decimal or negative number is input for data that should only be a natural number, it is determined that an error has occurred. In this case, the process returns to (S104). If the data has no problem in format, the control unit 31 temporarily stores the usage information 55 in the storage unit 33 (S107). If there are a plurality of necessary usage information 55 (S108), the procedure (S104 to S107) so far is repeated for the next usage information 55.

  Next, (S111) the control unit 31 displays the first inspection item on the display unit 34 for the procedure that actually requires measurement other than the usage information 55 among the inspection items 51 (S112). In accordance with the display content of the display unit 34, the user performs an inspection using a balance, a ruler, and other various measuring devices. When the inspection is completed, the result information 53 is input from the input unit 35 by the user (S113). As described above, the control unit 31 determines whether or not the input information is data having no problem in format (S114). If there is no problem, the control unit 31 temporarily stores the result information 53 in the storage unit 33. (S115). If the value of n matches the number of inspection items 51, the inspection ends there (S116), and if it is less (S117), the next inspection item 51 is displayed (S112 ~).

  When the inspection is completed (S116), the control unit 31 reads the usage information 55 and the result information 53 temporarily stored in the storage unit 33 and substitutes them into the determination formula 52 to derive the result (S121). If this result is the final value of the remaining life time 54 (S122), the control unit 31 displays the value on the display unit (S131). The user receives the display of the remaining life time, brings the inspection device 21 closer to the IC tag 12 as necessary, and writes the remaining life time 54, usage information 55, result information 53 and the like on the IC tag 12 (S132), A series of work is completed (S133).

  On the other hand, when the result obtained by the determination formula 52 is not the final value of the remaining life time 54 but the state determination stage of the machine element part 11 (S122), the control unit 31 responds to the state determination result. The inspection item 51 and the next judgment formula 52 are read from the storage unit 33 (S123), and the same procedure is executed for the inspection item 51 (S104- or depending on the content, S112-).

  Next, when a rolling bearing is targeted as an example of the machine element part 11, an example in the case where the calculation method of the remaining life time varies depending on the situation. Take, for example, pumps and fan rolling bearings, which are auxiliary machines used in chemical plants, steelworks and power plants, and rolling bearings used in motors that drive these devices. This is because the applied load is very small at 5% or less of the rated load, and metal fatigue does not occur under normal use conditions. Therefore, the remaining life time is limited because of the “peeling due to stress concentration” at the rising part of the indentation caused by the mixing of dust or the oil film breakage of the grease due to the mixing of water, and the raceway surface of the rolling bearing. This is a case where one of the “increases in vibration” due to the increase in the surface roughness of the surface occurs, and the remaining life calculation method varies depending on each case. Therefore, first, there is an inspection item 51 and a determination formula 52 at the determination stage for determining the state of the rolling bearing that is the machine element part 11, and when a specific condition is satisfied at the determination stage, the remaining life time is calculated. Diagnose in order.

  The inspection item 51 in the determination stage is to display on the display unit 34 so as to first obtain signal vibration using an acceleration sensor and obtain information 53 as a result. FIG. 5 shows an example of a judgment formula 52 that is a logical flow for judging by receiving the result information 53.

First, using an acceleration sensor, a vibration waveform of 5 kHz to 35 kHz is divided into frequencies by a 1/2 octave band, and a total of 6 bands are sampled (S211), and envelope processing is performed on the waveform of each frequency band. The frequency spectrum is calculated (S212).

Next, the bearing path frequency is calculated from the identification information 50 of the IC tag 12 included in the rolling bearing, and path frequency components (three of f _inn .f _out .f _ball ) are extracted from the envelope processing spectrum of each frequency band. (S215). Note that the calculation of the bearing path frequency differs for each rolling bearing model number, and is calculated by assigning a unique variable for each identification information 50. Next, the relative sensitivity (ratio with normal time) of the pass frequency component of each extracted frequency band is calculated (S216), and the upper three-band average of the relative sensitivity of the pass frequency component is obtained (S217). The calculation is performed independently for three of f _inn, f _{out, and} f _ball . It is determined whether any of the upper three band averages (three of f _inn .f _out .f _ball ) of this band frequency component has exceeded the threshold value (= 2.0) (S221), and the threshold value is set. When it does not exceed, it is estimated that it is normal (S222). This is the first stage of the determination formula 52.

  On the other hand, when the threshold value is exceeded, it is confirmed that the indentation origin type peeling mode is selected (S231), the indentation size is estimated from the relative sensitivity average of the upper three bands (S232), and the indentation origin type separation mode is used. The remaining life is diagnosed, and the remaining life is calculated by the following mathematical formula (1) for diagnosis (S233).

Here, P is the radial load during the bearing test, C is the basic dynamic load rating of the bearing, n is the rotational speed (rpm), L _10h is the basic dynamic rating life of JISB1518 / 1992, that is, a group of the same bearings. When rotating individually under the same conditions, 90% of the time is 1 million rotations without causing flaking (peeling) due to rolling fatigue.

Further, the 10% life L ₁₀ when the life test data is applied to the Weibull distribution is expressed by the following formula (2) according to the relationship with L _10h. Since it can be developed and the indentation diameter d (μm) can be expressed by the following formula (3), it can be finally developed by the following formula (4).

  That is, in the present invention, the inspection item 51 displays on the display unit 34 that the input of P, C, n, and d is requested as the usage information 55. The diameter of the indentation can be obtained by processing the vibration waveform. When these values are input from the input unit 35, the control unit 31 substitutes them into the above formulas (1) and (2) which are the judgment formulas 52, calculates L10 which is the remaining life time 54, and calculates the value. It will be displayed on the display unit 34.

Next, the remaining life calculation flow in the case of deterioration of the lubricating oil of the rolling bearing will be described.
The effective value of the sensor resonance frequency band 23k to 32 kHz is calculated (S241), the relative sensitivity of the 23k-32 kHz effective value is calculated (S242), and the relative sensitivity of the 23k-32 kHz effective value is a threshold value (= 1.5). Is determined (S243), and when the threshold is not exceeded, it is estimated that it is normal (S222). In the present invention, when the result information 53 is actually inputted as the measurement value of the acceleration sensor, the control unit 31 automatically calculates the calculation and determination from S241 to S243 and S222 as the judgment formula 52.

On the other hand, if the threshold value is exceeded (S251), it is determined that the mode is the lubricant deterioration mode, and the previously input value is used to estimate the lubricant deterioration degree from the effective value of 23 to 32 kHz (S252). In addition, the remaining life time is calculated (S253). First, the calculation life (L _hb ) of the _Booser equation is calculated by the equation (5).

t bearing outer ring temperature (° C.), S _G is the half-life subtraction coefficient according to the half-life subtraction coefficient, load and speed by half life subtraction coefficient, S _N and S _W respectively rpm by grease. S _G is a value specific to the grease to be used, and the storage unit 33 holds a table corresponding to the identification information 50 in advance. S _N and S _w are calculated by the following mathematical formulas (6) to (7), respectively.

  Here, d (mm) is the inner diameter of the bearing, nL is the catalog allowable rotational speed, and the unit is rpm. P (lbf) is a load load and Cr (lbf) is a basic dynamic load rating. These values are substituted into the above formulas (5) to (7) constituting the judgment formula 52 as variables derived from the usage information 55 and the identification information 50, and the remaining lifetime is calculated by the following formula (8). To do.

  In addition, a determination route different from the above procedure may be prepared, displayed on the display unit 34, and selected from the input unit 35. A cepstrum having a vibration waveform of 5 k to 35 kHz is calculated from the spectrum of the acceleration sensor (S261), a cepstrum coutosis is calculated (SS262), and it is determined whether or not the coutosis exceeds a threshold value (3.8) ( S263), if it exceeds, the remaining life time is calculated in the indentation origin peeling mode as described above (S231 to S233), otherwise the remaining life time is calculated in the lubricant deterioration mode as described above (S251). ~ S253).

11, 11A Machine element parts (bearing device)
12, 12a, 12b, 12c IC tag 13 Inner ring 14 Outer ring 15 Cage 16 Rolling body 21 Inspection device 31 Control unit 32 Communication unit 33 Storage unit 34 Display unit 35 Input unit 37 Network function unit 39 Battery 41 Communication unit 42 Storage unit 43 Control unit 50, 50a, 50b, 50c Identification information 51 Inspection item 52 Judgment formula 53 Result information 54 Remaining life time 55 Usage information 61 Machine element parts management database 71 Inspection item management database 81 Network

Claims (12)

An IC tag capable of recording identification information including at least one of the type, production time, production lot, and production history of the machine element part and reading the identification information from the outside by an electromagnetic method. Install,
In checking after using the above machine element parts,
A communication unit capable of reading the identification information of the IC tag, a storage unit storing a check item corresponding to the identification information and a determination formula for calculating the remaining life time from the result information on the check item, and the inspection The display unit capable of displaying the item and the remaining life time, the input unit capable of inputting the result information, and calculating the determination formula based on the result information input from the input unit to calculate the remaining life time. Using an inspection device having a control unit,
The identification information contained in the IC tag of the machine element part is read by the communication unit, inspected according to the inspection item displayed on the display unit, and the result information obtained by executing the inspection item is input. The remaining life calculation method of the machine element part which calculates | requires the said remaining life time which inputs into a part and is displayed on the said display part. The inspection item includes the input of the usage history of the machine element part,
The method according to claim 1, wherein the result information includes usage information regarding the usage history.   There are a plurality of inspection items, the display unit can display a plurality of the inspection items, the input unit can input a plurality of the result information, and the judgment formula is included in the plurality of the result information. The remaining life calculation method for machine element parts according to claim 1 or 2, wherein the remaining life is calculated based on the above. When there are multiple inspection items and one inspection item is displayed, it is possible to accept the input of the result information for the one inspection item and wait for the input of the result information for the one inspection item. Display the following inspection items on the display section,
3. The machine element according to claim 1, wherein the remaining life time is calculated by calculating the judgment formula based on the result information after waiting for the input of the result information for all the inspection items. How to calculate the remaining life of parts.   5. After calculating the remaining lifetime, at least one or a part of the inspection item, the usage information, and the remaining lifetime is written in the IC tag. The remaining life calculation method for machine element parts described in 1.   6. The remaining life calculation method for machine element parts according to claim 1, wherein the inspection device has a battery and is portable.   The inspection apparatus has a network function, and transmits the identification information, the use information, the remaining life time, reusability, or a plurality of them to a separately provided machine element parts management database for registration. The remaining life calculation method for machine element parts according to any one of claims 1 to 6.   The inspection device has a network function, reads the identification information by the communication unit, transmits it to a separately provided inspection item management database, receives the inspection item and the determination formula corresponding to the identification information, and The method for calculating the remaining life of a machine element part according to any one of claims 1 to 7, wherein the remaining life is temporarily stored in a storage unit.   The machine element part further comprises a plurality of component parts, and each of the component parts has the IC tag, and the reusability determination is made for all of the sub parts constituting the machine element part. The method for calculating the remaining life of a machine element part according to any one of claims 1 to 8, wherein the remaining life is calculated based on a calculation result of the determination formula based on the inspection item.   The method for calculating the remaining life of a machine element part according to claim 9, wherein the machine element part is a bearing device, and the IC tag is attached to a plurality of components of the bearing device.   11. The method for calculating the remaining life of a machine element part according to claim 9 or 10, wherein the IC tag is read after disassembling the machine element part for each component part.   The machine according to any one of claims 1 to 11, wherein the machine element part has at least a metal part, and the IC tag is a corresponding IC tag that can be read and written in a state where the IC tag is attached or embedded in the metal part. Method for calculating the remaining life of element parts.

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