JP2000181957A - Preventive maintenance system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quickly deal with faults and to reduce the standstill time of production facilities by making a maintenance history and maintenance component management into data base and retrieving the same fault from the data base when that fault occurs. SOLUTION: In a preventive maintenance system 1 for production facilities, maintenance history information and maintenance component information of production facilities are respectively stored in data bases 106 and 105. In this case, when any fault occurs, the same fault is retrieved from the data bases 106 and 105 by a maintenance history part 102 and the method of dealing and place preserving the required maintenance components are referred to. In a maintenance planning part 104, a maintenance plan history DB 109 is retrieved and a maintenance plan is prepared by calculating the timing to exchange maintenance components based on the service life of maintenance components, working time of facilities and working conditions or the like. Thus, the faults can be quickly dealt with, the maintenance component can be exactly exchanged and maintenance costs can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a preventive maintenance system for production equipment, and more particularly, to a database of maintenance work history and maintenance parts management. By referring to the method and the storage location of necessary maintenance parts, quick response to failures is possible, and the life time of maintenance parts,
The replacement time of maintenance parts is calculated based on the operation time and operation status of the equipment, the scheduled operation time of the equipment according to the production plan, etc.
Create a maintenance work plan.

[0002]

2. Description of the Related Art Conventionally, preventive maintenance of production equipment is regularly performed by a maintenance inspection book in which check items, cleaning points, replacement of maintenance parts and the timing of the replacement are described for each equipment. Further, the replacement time of the maintenance parts described in the maintenance inspection book is set with reference to the replacement cycle and life time described in the instruction manual.

[0003] Even if such preventive maintenance measures are taken, a failure occurs, and production equipment is stopped, resulting in poor production efficiency. FIG. 23 shows a conventional handling procedure when a failure occurs. If a failure occurs in a production facility, first look for an instruction manual to find a solution. However, if there are multiple possible causes and countermeasures, each time a fault occurs, refer to the maintenance report that describes and saves the phenomenon, cause, and corrective method of the fault, that is, refer to past fault cases, Look for a solution to the same failure. If there is still nothing corresponding,
You will have to contact the equipment manufacturer's maintenance staff to find a solution.

[0004] If a maintenance report shows a coping method, a necessary maintenance part is referred to a maintenance parts management file organized for each facility or each part, and the presence / absence of a maintenance part, a storage location, and the like are determined to deal with a failure. Will be done.

[0005]

However, FIG.
According to the conventional technology shown in
It takes a long time to find a method of coping with the failure and to find a maintenance part that needs to be replaced, which causes a problem that the production equipment is stopped for a long time. Also, the replacement time of the maintenance parts is set by, for example, dividing the life time described in the instruction manual by the operation time per day. There has been a problem that the maintenance parts are replaced at a certain time, or the life of the maintenance parts expires, and the production equipment is stopped.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-described problems, and is directed to a database for storing maintenance work history information and maintenance part information of production equipment in a preventive maintenance system for production equipment. When a failure occurs, means for searching the database for the same failure, referring to the corrective action and the storage location of the required maintenance parts, and based on the life time of the maintenance parts, the operating time and the operating status of the equipment, etc. By providing a means for calculating the replacement time of maintenance parts and creating a maintenance work plan, it is possible to quickly respond to a failure and to replace maintenance parts accurately and reduce maintenance costs. Can be.

In this specification, "tone coefficient"
The term is provided in units or parts of the production equipment, is set based on the past operation results of the production equipment and the current operation status, and is calculated by the following equation. Tone factor
= 1-(current defect rate-average defect rate in the period up to past replacement) The defect rate is calculated by dividing the defective quantity by the total production quantity. For example, the SMT (Su
rface Mounting Technology) In the example of the suction nozzle in the apparatus, it is obtained as follows. Defect occurrence rate = number of unsucked pieces / total number of sucked pieces In the example of the component supply cassette, it is obtained as follows. Defect occurrence rate = number of defective parts sent / total number of parts sent

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a preventive maintenance system for production equipment, a maintenance part information DB (Data) storing parts names, part numbers, life times, names of equipment used, storage locations, etc. of maintenance parts.
Base) and the part name, part model number, life time,
A maintenance part information management unit that registers maintenance part information such as the used equipment name and storage location in the maintenance part information DB, and searches for maintenance part information from the maintenance part information DB using the equipment model number and the part model number as keys; Maintenance work history information DB that stores the equipment model number at the time of failure, error code of the failure, phenomenon, cause, countermeasure, and required maintenance part name, etc., and the equipment model number at the time of the failure, error code of the failure, phenomenon, cause ,
The maintenance work information such as the coping method and the required maintenance part name is registered in the maintenance work history information DB, and the maintenance work history information D is set by using the equipment model number, error code, phenomenon, and the like as keys.
A maintenance work history information management unit for searching for a troubleshooting method and a replacement part storage location from B, and a maintenance work plan for storing maintenance work plan information such as a scheduled maintenance work date, a work name, a work category, and a worker. The maintenance work plan information is searched from the history DB and the maintenance work plan history DB using the equipment model number and the part model number as keys, and the maintenance work history information DB is searched using the same key. And a maintenance planning section that calculates the replacement time of maintenance parts based on the operation status of the production equipment that uses the maintenance parts and creates a maintenance work plan for the production equipment. Maintenance parts can be replaced at an appropriate time and maintenance costs can be reduced.

Further, unit price information of maintenance parts is provided in the maintenance parts information DB, and information on work costs and man-hours is provided in the maintenance work history information DB, and the maintenance parts information DB and the maintenance work history information DB are searched. By providing a totaling unit that totalizes and graphs the work costs, man-hours, maintenance parts costs, etc. required for the maintenance work of the production equipment using the equipment model number, parts model number, cost breakdown, period, work category as keys Work costs, man-hours, and maintenance parts costs required for equipment maintenance can be easily tabulated and grasped.

Further, an equipment operation history DB in which the actual operation times of the production equipment are stored on a daily basis, a production plan DB in which the future operation times of the production equipment are stored on a daily basis, A maintenance planning unit for calculating a maintenance component replacement time based on the operation status and operation results and / or operation schedule of the production equipment using the maintenance component and creating a maintenance plan for the production equipment; The maintenance parts can be replaced at an appropriate time, and the maintenance cost can be reduced.

[0011] Further, the life time of the maintenance part is divided by the operating time per day up to the present time to obtain the remaining life days.
Also, based on the past operation results of production equipment using maintenance parts and the current operation status, a tone coefficient is set for each unit or component, and the number of days obtained by multiplying the remaining life days by the tone coefficient is calculated as the current number. By calculating the replacement date of the maintenance part by adding it to the date, the maintenance part can be replaced at a more accurate time, and the maintenance cost can be reduced.

Further, the remaining operating time of the production equipment using the maintenance part is subtracted from the life time of the maintenance part to determine the remaining life time, and the remaining life time and the production equipment using the maintenance part are determined. Is compared with the time accumulated for each day, and the day before the day when the remaining life time becomes smaller is calculated as the number of remaining life days. Calculate the maintenance factor for each unit or component according to the actual operation status and the current operation status, and calculate the replacement date of the maintenance parts by adding the number of days obtained by multiplying the remaining life days by the tension factor to the current date. As a result, maintenance parts can be replaced at a more appropriate time, and maintenance costs can be reduced.

[0013]

FIG. 1 is a block diagram showing the configuration of the present invention. In the figure, 1 is a preventive maintenance server, and 2 is a client connected to the preventive maintenance server 1 via a network to register, search, and browse various information.

The preventive maintenance server 1 includes a maintenance parts information DB 105 for storing the parts name, parts model number, life time, used equipment name, storage location, unit price, etc. of the maintenance parts, and the parts names, part model numbers, and life of the maintenance parts. A maintenance part information management unit 101 that registers maintenance part information such as time, used equipment name, and storage location in the maintenance part information DB, and searches for maintenance part information from the maintenance part information DB using equipment model numbers and part model numbers as keys.
And a maintenance work history information DB 106 for storing the equipment model number at the time of the failure, the error code of the failure, the phenomenon, the cause, the coping method and the required maintenance part name, the work cost required for the maintenance work, the number of work steps, and the like. Register maintenance work information such as the equipment model number at the time of occurrence, failure error code, phenomenon, cause, countermeasures, and required maintenance part names in the maintenance work history information DB, and use the equipment model number, error code, phenomenon, etc. as keys A maintenance work history information management unit 102 for searching the maintenance work history information DB for a coping method at the time of failure and a storage location of a replacement part, a facility operation history DB 107 for storing the actual operation time of the production equipment on a daily basis, A production plan DB 108 for storing the scheduled operation time for each day, and maintenance work plan information such as the scheduled maintenance work date, work name, work classification, and worker. The maintenance work plan history database 109 and maintenance work plan information such as scheduled maintenance work dates, work names, work categories, and workers are registered in the maintenance work plan history DB, and the maintenance work plan is performed using the equipment model number, part model number, etc. as a key. History DB
From the maintenance work history information DB with the same key, the life time of the searched maintenance parts, and the operation status and operation results of the production equipment using the maintenance parts. Based on the future operation schedule, the maintenance part replacement time is calculated, the maintenance planning unit 104 for creating a maintenance work plan for the production equipment, the maintenance part information DB and the maintenance work history information DB are searched, and the production equipment It is composed of a totaling unit 103 for totalizing and graphing operation costs, maintenance man-hours, maintenance parts costs, and the like required for maintenance using equipment model numbers, part model numbers, cost breakdowns, periods, and work categories as keys.

FIG. 2 shows a configuration diagram of an embodiment of the maintenance part information DB. The maintenance part information DB 105 includes a part name, a part model number, a life time indicating the life of the part, an equipment model number indicating a facility in which the part is used, a unit price of the part, an ordering party indicating a contact address for supplying the part, a charge, It consists of a telephone number, stock quantity, storage location, etc.

FIG. 3 shows a configuration diagram of an embodiment of the maintenance work history information DB. The maintenance work history information DB 106 includes, as main items, material information, required time, target equipment, work details,
It is composed of coping parts and replenishment processing.

The material information includes a report number, a work name,
The required time is composed of equipment stop time, equipment repair time, work man-hours, and production stop time, and the target equipment is the process, equipment name, equipment model number, It consists of unit names, work details consist of error codes, phenomena, causes, and remedies.Corresponding parts consist of part names, part numbers, and used quantities, and replenishment processing consists of order dates, delivery dates, and orderers. I have.

The operation of the maintenance work history information management unit will be described with reference to FIGS. FIG. 4 is a processing flowchart of one embodiment of the maintenance work history information management unit, FIG. 5 is a maintenance work information registration screen of one embodiment in the maintenance work history information management unit, and FIG. 6 is one embodiment of the maintenance work history information management unit. 7 is a search result list display screen of an embodiment in the maintenance work history information management unit, and FIG. 8 is a search result detail screen of an embodiment in the maintenance work history information management unit.

The operation will be described below with reference to the flow chart of FIG.

Step S401: A selection screen for equipment registration or search of maintenance work information is displayed, and an instruction from the operator is obtained.

Step S402: If the instruction from the operator is equipment registration, the flow proceeds to step S403; otherwise, the flow proceeds to step S405.

Step S403: The maintenance work information registration screen 51 shown in FIG. 5 is displayed, and detailed equipment information is obtained from the operator. When this screen is displayed, the operator sets detailed equipment information and presses a equipment registration button at the bottom of the screen.

Step S404: The maintenance work information acquired in step S403 is stored in the maintenance work history information DB. Then, the process ends.

Step S405: The search condition input screen 61 of FIG. 6 is displayed, and the search condition from the operator is obtained. When this screen is displayed, the operator sets the equipment model number, part model number, unit name, operator, phenomenon, error code, period, and the like, and presses a search button at the bottom of the screen.

Step S406: Based on the search condition acquired in step S405, matching data is searched from the maintenance work history information DB, and the searched information is displayed on the search result list display screen 71 of FIG. Then, the equipment model number for performing the detailed display is obtained from the operator. When this screen is displayed, the operator selects the equipment model number for performing the detailed display, and presses a detailed display button at the bottom of the screen.

Step S407: The maintenance work information for the equipment model number obtained in step S406 is displayed on the search result detail screen 81 in FIG. If necessary, the operator edits maintenance work history information and maintenance detailed information on this screen, and then presses an end button at the bottom of the screen. Then, the process ends.

The operation of the maintenance parts information management unit will be described with reference to FIGS. FIG. 9 is a processing flowchart of one embodiment of the maintenance part information management unit. FIG. 10 is a maintenance part information registration screen of one embodiment in the maintenance part information management unit.
Is a search condition input screen of one embodiment in the maintenance part information management unit, FIG. 12 is a search result list display screen of one embodiment in the maintenance part information management unit, and FIG. 13 is a search result of one embodiment in the maintenance part information management unit It is a detail screen.

The operation will be described below with reference to the flow chart of FIG.

Step S901: A part registration or search selection screen for maintenance part information is displayed, and an instruction from the operator is obtained.

Step S902: If the instruction from the operator is a component registration, the process proceeds to step S903. If not, the process proceeds to step S905.

Step S903: The maintenance part information registration screen 1001 shown in FIG. 10 is displayed to obtain detailed part information from the operator. When this screen is displayed, the operator sets detailed component information and presses a component registration button at the bottom of the screen.

Step S904: The maintenance part information acquired in step S903 is stored in the maintenance part information DB. Then, the process ends.

Step S905: The search condition input screen 1101 of FIG. 11 is displayed, and the search condition from the operator is obtained. When this screen is displayed, the operator sets the part model number, equipment model number, unit name, operator, period, and the like, and presses a search button at the bottom of the screen.

Step S906: Matching data is searched from the maintenance part information DB based on the search condition acquired in step S905, and the searched information is displayed on the search result list display screen 1201 in FIG. Then, a part model number to be displayed in detail is obtained from the operator. When this screen is displayed, the operator selects a part model number to be displayed in detail and presses a detail display button at the bottom of the screen.

Step S907: The maintenance part information for the part model number obtained in step S906 is displayed on the search result detail screen 1301 in FIG. If necessary, the operator edits the component detailed information and the component history information on this screen, and then presses an end button at the bottom of the screen. Then, the process ends.

The operation of the maintenance planning unit will be described with reference to FIGS. FIG. 14 is a processing flowchart of one embodiment of the maintenance planning unit, FIG. 15 is a search condition input screen of one embodiment of the maintenance planning unit, FIG. 16 is a search result list display screen of one embodiment of the maintenance planning unit, and FIG. It is a search result detailed screen of one Example in a maintenance planning part.

Hereinafter, the operation will be described in accordance with the flow of FIG.

Step S1401: The search condition input screen 1501 for the maintenance work plan shown in FIG. 15 is displayed, and the search condition from the operator is obtained. When this screen is displayed, the operator sets the part model number, equipment model number, unit name, maintenance item, period, and the like, and presses a search button at the bottom of the screen.

Step S1402: Step S1401
Searches the maintenance part information DB for data that matches the search condition obtained in the above, and calculates a maintenance part replacement date for each maintenance part. The details of the process for calculating the maintenance part replacement date will be described later.

Step S1403: Step S1401
The data matching the search condition acquired in step S1402 is searched from the maintenance work plan history DB, and displayed on the search result list display screen 1601 in FIG. 16 together with the information searched and calculated in step S1402. Then, the equipment model number for performing the detailed display is obtained from the operator. When this screen is displayed, the operator selects the equipment model number for performing the detailed display, and presses a detailed display button at the bottom of the screen.

Step S1404: Step S1403
17 shows the maintenance work plan information for the equipment model number obtained in FIG.
Is displayed on the search result detail screen 1701. If necessary, the operator edits the maintenance work history information on this screen, and then presses an end button at the bottom of the screen. Then, the process ends.

Next, the operation of the process for calculating the maintenance part replacement date will be described with reference to FIGS. FIG. 18 is a processing flowchart of one embodiment of the processing for calculating the maintenance part replacement date, and FIG. 19 is an explanatory diagram of the operation of the calculation processing. The maintenance plan table 1901 in FIG. 19 is a work table for calculating the maintenance part replacement date, and is used for the component name, life time, used equipment name, previous replacement date, operation time, remaining life time, and operation schedule. It is composed of the life span, tone coefficient, scheduled replacement date, and the like.

Hereinafter, the operation will be described in accordance with the flow of FIG.

Step S1801: The maintenance plan table 1901 is created in the temporary storage unit and initialized.

Step S1802: maintenance part information DB1
05, the part name, life time, used equipment name, and the last replacement date of the part are extracted and stored in the maintenance plan table.

Step S1803: The operation times of all parts in the maintenance plan table are extracted from the equipment operation history DB 107 and stored in the maintenance plan table.

Step S1804: The remaining life time in the maintenance plan table is calculated by subtracting the operation time from the life time.

Step S1805: The life days for the operation schedule in the maintenance plan table are calculated by subtracting the operation time of the production plan stored in the production plan DB 108 from the remaining life time.

Step S1806: Facility operation history DB1
07 is retrieved, and a tone coefficient is calculated with the number of defects in one week / the total number of productions as a defect occurrence rate.

Step S1807: The number of days calculated by multiplying the current date by the number of life days for the scheduled operation and the tone coefficient is added, and the scheduled replacement date of the maintenance part is calculated.

Step S1808: The horizontal axis is the date, the vertical axis is the equipment name and the equipment model number, and the maintenance part replacement schedule is displayed in a graph. Then, the process ends.

The operation of the counting section will be described with reference to FIGS. FIG. 20 is a processing flowchart of one embodiment of the tallying unit, FIG. 21 is a search condition input screen and a search result screen (1) of one embodiment of the tallying unit, and FIG. It is a search result screen (2). Hereinafter, the operation will be described according to the flow of FIG.

Step S2001: A selection screen for cost totaling and man-hour totaling is displayed, and an instruction from the operator is obtained.

Step S2002: It is determined whether or not the instruction from the operator is the cost summation. Step S if total cost
Proceed to 2003, and if it is not the cost aggregation, step S20
Go to 05.

Step S2003: The search condition input screen 2101 for cost totalization shown in FIG. 21 is displayed to obtain the search condition from the operator. When this screen is displayed, the operator sets search conditions such as equipment model number, part model number, cost breakdown, period, part or work cost, and presses a search button at the bottom of the screen.

Step S2004: Search the maintenance work history information DB for data that matches the obtained search condition.
These costs are calculated, and the search result screen 2102 of FIG.
Is displayed as a 100% stacked bar graph. After confirming the result, the operator presses the end button at the bottom of the screen. Then, the process ends.

Step S2005: A search condition input screen 2201 for man-hour totalization shown in FIG. 21 is displayed to obtain search conditions from the operator. When this screen is displayed, the operator sets search conditions for the equipment model number, work category, and period, and presses a search button at the bottom of the screen.

Step S2006: Search the maintenance work history information DB for data matching the obtained search condition,
The man-hours are calculated, and the search result screen 2202 of FIG.
Is displayed as a 100% stacked bar graph. After confirming the result, the operator presses the end button at the bottom of the screen. Then, the process ends.

[0059]

The present invention is embodied in the form described above, and has the following effects.

The maintenance parts information such as the storage date of the maintenance parts, the cost, the corresponding equipment, and the storage location is stored in a database.
In addition, work history information describing the phenomenon, cause, countermeasures, required maintenance parts, etc. at the time of failure occurrence is made into a database, and when an equipment failure occurs, these databases are searched using the failure phenomenon etc. as a key, Find the countermeasures and the storage location of necessary maintenance parts. As a result, it is possible to quickly respond to a failure and to significantly reduce the downtime of the production facility.

Further, by setting the replacement time of the maintenance parts based on the life time of the maintenance parts, the operation time and the operation state of the equipment, the scheduled operation time of the equipment according to the production plan, etc., the replacement of the maintenance parts in a timely manner. Can be performed, and the cost of maintenance parts and maintenance work can be reduced.

Further, it is possible to easily collect and grasp the work cost, the number of man-hours, and the maintenance parts cost required for the maintenance of the production equipment. In addition, it is possible to easily compare the maintenance work plan with the maintenance work results.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram of the present invention.

FIG. 2 is a configuration diagram of an embodiment of a maintenance part information DB.

FIG. 3 is a configuration diagram of an embodiment of a maintenance work history information DB.

FIG. 4 is a processing flowchart of an embodiment of a maintenance work history information management unit.

FIG. 5 is a maintenance work information registration screen of an embodiment in a maintenance work history information management unit.

FIG. 6 is a search condition input screen according to an embodiment in a maintenance work history information management unit.

FIG. 7 is a search result list display screen of an embodiment in a maintenance work history information management unit.

FIG. 8 is a detailed search result screen of an embodiment in the maintenance work history information management unit.

FIG. 9 is a processing flowchart of an embodiment of a maintenance part information management unit.

FIG. 10 is a maintenance component information registration screen according to an embodiment in the maintenance component information management unit.

FIG. 11 is a search condition input screen according to an embodiment in the maintenance part information management unit.

FIG. 12 is a search result list display screen of an embodiment in the maintenance part information management unit.

FIG. 13 is a detailed search result screen of the maintenance part information management unit according to one embodiment.

FIG. 14 is a processing flowchart of an embodiment of a maintenance planning unit.

FIG. 15 is a search condition input screen of an embodiment in the maintenance planning unit.

FIG. 16 is a search result list display screen of an embodiment in the maintenance planning unit.

FIG. 17 is a detailed search result screen of one example in the maintenance planning unit.

FIG. 18 is a flowchart illustrating an example of a process for calculating a maintenance part replacement date according to an embodiment;

FIG. 19 is a diagram illustrating the operation of the calculation process.

FIG. 20 is a processing flowchart of an embodiment of a tallying unit.

FIG. 21 shows a search condition input screen and a search result screen (1) of an embodiment in a tallying unit.

FIG. 22 shows a search condition input screen and a search result screen (2) in one embodiment in the counting unit.

FIG. 23 shows a conventional procedure for dealing with a failure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Preventive maintenance server 2 Client 101 Maintenance parts information management part 102 Maintenance work history information management part 103 Total part 104 Maintenance plan part 105 Maintenance parts information DB 106 Maintenance work history information DB 107 Equipment operation history DB 108 Production plan DB 109 Maintenance work plan History DB

Continued on the front page F-term (reference)

Claims (5)

[Claims] In a preventive maintenance system for production equipment, a part name of a maintenance part, a part model number, a life time, a name of equipment used,
Maintenance parts information DB (105) for storing storage locations and the like
And the part name, part model number, life time,
The maintenance part information such as the storage location is stored in the maintenance part information DB (10
5), a maintenance part information management unit (101) for searching for maintenance part information from the maintenance part information DB (105) using the equipment model number, the part model number, etc. as a key; Maintenance work history information DB (106) that stores error codes, phenomena, causes, countermeasures, and required maintenance part names, etc., equipment model numbers when faults occur, fault error codes, phenomena, causes, countermeasures, and necessity The maintenance work information such as the name of the maintenance part to be registered is registered in the maintenance work history information DB (106), and the troubleshooting method is described from the maintenance work history information DB (106) using the equipment model number, error code, phenomenon, etc. as keys. A maintenance work history information management unit (102) for searching for a storage location of a replacement part, and a maintenance for storing maintenance work plan information such as a scheduled maintenance work date, a work name, a work category, and an operator. Business plan history DB (10
9) searching for maintenance work plan information from the maintenance work plan history DB (109) using the equipment model number, part model number, etc. as a key, and searching the maintenance work history information DB (106) using the same key;
A maintenance planning unit (104) that calculates the replacement time of the maintenance part based on the retrieved life time of the maintenance part and the operation status of the production equipment that uses the maintenance part, and creates a maintenance work plan for the production equipment (104). And a preventive maintenance system comprising: 2. The maintenance part information DB (105) is provided with maintenance unit price information, and the maintenance work history information DB (10).
In 6), information of work cost and work man-hour is provided, and a maintenance parts information DB (105) and a maintenance work history information DB
(106), and summarizing and graphing the work cost, work man-hours, maintenance parts cost, and the like required for the maintenance work of the production equipment by using the equipment model number, the part model number, the cost breakdown, the period, and the work category as keys. The preventive maintenance system according to claim 1, characterized in that it comprises a part (103). 3. An equipment operation history DB (107) in which actual operation times of the production equipment are stored daily, a production plan DB (108) in which future operation times of the production equipment are stored daily. A maintenance plan that calculates the replacement time of maintenance parts based on the life time of the maintenance parts, the operation status and operation results and / or operation schedule of the production equipment that uses the maintenance parts, and creates a maintenance plan for the production equipment. The preventive maintenance system according to claim 1 or 2, comprising a part (104). 4. The life time of the maintenance part is divided by the operating time per day up to the present time to obtain the remaining life days. According to the situation, the tone coefficient is set for each unit or part, and the number of days obtained by multiplying the remaining life days by the tone coefficient is added to the current date to calculate the replacement date of the maintenance part. Item 3. The preventive maintenance system according to Item 3. 5. The remaining life time is obtained by subtracting the operating time up to the present time of the production equipment using the maintenance part from the life time of the maintenance part, and obtaining the remaining life time and the production equipment using the maintenance part. Is compared with the time accumulated for each day, and the day before the day when the remaining life time is reduced is calculated as the number of remaining life days. Calculate the maintenance factor by setting the tone coefficient for each unit or part according to the actual operation status and the current operation status, and add the number of days obtained by multiplying the remaining life days by the tone factor to the current date to calculate the replacement date of the maintenance part. The preventive maintenance system according to claim 3, wherein: