Work evaluation system, display device and work evaluation program

Abstract

To specify a period of time, in which a work having predetermined properties is performed, more suitably.SOLUTION: A work evaluation system 1 comprises: a server 30 which includes a work of a worker W in a state where a welding robot 20 is stopped, and acquires operation start times of the welding robot 20 for each welding work repeated by the welding robot 20 and the worker W, and, on the basis of the acquired operation start times, calculates standard deviation of non-operation times of the welding robot 20 during the welding work with respect to a plurality of periods of time, and selects any one of the plurality of periods of time on the basis of the calculated standard deviation; and a display device 43 for displaying information for specifying the period of time selected by the server 30.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a work evaluation system, a display device, and a work evaluation program for evaluating a predetermined work repeated by equipment and workers.

Background Art

[0002] Patent Document 1 discloses a system that displays a chart representing the operation rate and cycle time of production equipment for producing a product in a state where their variations can be visually recognized.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, when a predetermined work including the work of a worker in a state where the equipment is stopped is repeated by the equipment and the worker, there is a desire to more appropriately specify a period during which a work having a predetermined property such as a preferable work or a work to be improved is performed.

[0005] Since the system disclosed in Patent Document 1 only shows the operation rate and cycle time of production equipment in a chart, even by referring to this chart, it is not possible to specify a period during which a work having a predetermined property such as a preferable work or a work to be improved is performed.

[0006] The present disclosure has been made in view of such a point, and an object thereof is to enable more appropriately specifying a period during which a work having a predetermined property is performed.

Means for Solving the Problems

[0007] To achieve the above object, an embodiment of the present disclosure causes a computer to include the work of an operator in a state where the facility is stopped, and for each predetermined work repeated by the facility and the operator, acquire the operation start time of the facility, and based on the acquired operation start time, calculate, for a plurality of periods, one of the variation in the cycle time of the work and the variation in the non-operation time of the facility during the work, and select, based on the calculated variation, any one of the plurality of periods.

[0008] Since the non-operation time of the facility includes the time when the operator works in a state where the facility is stopped, it is likely to vary. In the embodiment of the present disclosure, since one of the variation in the cycle time of the work including the non-operation time of the facility and the variation in the non-operation time of the facility is reflected in the selection of the period, the period in which the work having a predetermined property is performed can be more appropriately specified.

Advantages of the Invention

[0009] According to the present disclosure, the period in which the work having a predetermined property is performed can be more appropriately specified.

Brief Description of the Drawings

[0010]

Figure 1

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Embodiments for Carrying Out the Invention

[0011] Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following description of the preferred embodiments is merely exemplary in nature and is in no way intended to limit the present invention, its applications, or its uses.

[0012] FIG. 1 shows the configuration of a work evaluation system 1 according to an embodiment of the present disclosure. This work evaluation system 1 includes a welding robot 20 as equipment, a server 30 as a computer, and a local computer 40. An operator W and the welding robot 20 repeat welding operations. The welding operation includes a job in which the operator W fixes a workpiece to a jig with the welding robot 20 stopped, and a welding operation by the welding robot 20 on the workpiece fixed to the jig.

[0013] For each of the welding operations, the server 30 acquires the operation start time and the operation end time of the welding robot 20, and based on the acquired operation start time and operation end time, calculates the variation in the non-operation time of the welding robot 20 during operation for a plurality of periods. Then, the server 30 selects one of the plurality of periods based on the calculated variation. Specifically, the server 30 includes an information acquisition unit 31, a non-operation time calculation unit 32, a standard deviation calculation unit 33, a selection unit 34, a setting unit 35, a data memory 36, and a program memory 37. The information acquisition unit 31, the non-operation time calculation unit 32, the standard deviation calculation unit 33, the selection unit 34, and the setting unit 35 are configured by an arithmetic device (control unit). The functions of the information acquisition unit 31, the non-operation time calculation unit 32, the standard deviation calculation unit 33, the selection unit 34, and the setting unit 35 are realized by the arithmetic device executing a work evaluation program stored in the program memory 37.

[0014] The information acquisition unit 31 acquires the operation start time and operation end time of the welding robot 20 for each welding operation, and stores them in the database of the data memory 36. In the example of FIG. 2, the information acquisition unit 31 acquires times t11, t21, and t31 as the operation start times of the welding robot 20. Also, the information acquisition unit 31 acquires times t12, t22, and t32 as the operation end times of the welding robot 20. The information acquisition unit 31 performs the acquisition of the operation start time and the operation end time for each welding operation that is repeated by a plurality of combinations of the welding robot 20 and the operator W.

[0015] The non-operation time calculation unit 32 calculates the cycle time of the welding operation, the operation time of the welding robot 20 during the welding operation, and the non-operation time of the welding robot 20 during the welding operation based on the operation start time and operation end time of the welding robot 20 acquired by the information acquisition unit 31, and stores them in the database of the data memory 36. In the example of FIG. 2, the non-operation time calculation unit 32 calculates times T1, T2, and T3 as the cycle time of the welding operation, and calculates times T11, T21, and T31 as the operation time of the welding robot 20. Also, the non-operation time calculation unit 32 can calculate the non-operation times T12, T22, and T32 of the welding robot 20 during the welding operation as the working times by the operator W by subtracting the operation times T11, T21, and T31 of the welding robot 20 from the cycle times T1, T2, and T3 of the welding operation. The non-operation time calculation unit 32 performs the calculation of the cycle time of the welding operation, the operation time of the welding robot 20, and the non-operation time as described above for each welding operation that is repeated by a plurality of combinations of the welding robot 20 and the operator W. In the present embodiment, as shown in FIG. 3, both the welding robot (equipment) 20 and the operator W are different from each other in the plurality of combinations. Note that the plurality of combinations may be such that only one of the welding robot (equipment) 20 and the operator W is different from each other.

[0016] The standard deviation calculation unit 33 calculates the standard deviation of the non-operating time calculated by the non-operating time calculation unit 32 as a variation, and stores it in the database of the data memory 36. The calculation of the standard deviation is performed for a plurality of periods for each of a plurality of combinations of the welding robot 20 and the operator W. The length R of each period is set according to the input to the input device 41 described later. In the present embodiment, the length R of each period is set to one week (seven days), but it may be set to other lengths such as one month.

[0017] For example, in the example of FIG. 3, when the combination of the welding robot 20 and the operator W is the welding robot a and the operator e, and the product A is manufactured, the standard deviations Rt-2, Rt-1, and Rt-0 of the non-operating time in the three periods t-2, t-1, and t-0 are calculated as 8, 9, and 10. The period t-0 is the period from one week ago to the current time, the period t-1 is the period of one week from two weeks ago, and the period t-2 is the period of one week from three weeks ago. Also, when the combination of the welding robot 20 and the operator W is the welding robot b and the operator f, and the product A is manufactured, the standard deviations Rt-2, Rt-1, and Rt-0 of the non-operating time in the three periods t-2, t-1, and t-0 are calculated as 5, 5, and 5. Also, when the combination of the welding robot 20 and the operator W is the welding robot c and the operator g, and the product A is manufactured, the standard deviations Rt-2, Rt-1, and Rt-0 of the non-operating time in the three periods t-2, t-1, and t-0 are calculated as 2, 2, and 2. Also, when the combination of the welding robot 20 and the operator W is the welding robot d and the operator h, and the product B is manufactured, the standard deviations Rt-2, Rt-1, and Rt-0 of the non-operating time in the three periods t-2, t-1, and t-0 are calculated as 14, 10, and 20.

[0018] Also, in the example of FIG. 5, when the combination of the welding robot 20 and the operator W is the welding robot a and the operator e, the standard deviations Rt-2, Rt-1, and Rt-0 of the non-operating time in the three periods t-2, t-1, and t-0 when manufacturing the product A are calculated as 2, 3, and 10. Also, when the combination of the welding robot 20 and the operator W is the welding robot b and the operator f, the standard deviations Rt-2, Rt-1, and Rt-0 of the non-operating time in the three periods t-2, t-1, and t-0 when manufacturing the product A are calculated as 5, 5, and 5. Also, when the combination of the welding robot 20 and the operator W is the welding robot c and the operator g, the standard deviations Rt-2, Rt-1, and Rt-0 of the non-operating time in the three periods t-2, t-1, and t-0 when manufacturing the product C are calculated as 4, 2, and 4. Also, when the combination of the welding robot 20 and the operator W is the welding robot d and the operator h, the standard deviations Rt-2, Rt-1, and Rt-0 of the non-operating time in the three periods t-2, t-1, and t-0 when manufacturing the product C are calculated as 5, 6, and 7.

[0019] The selection unit 34 selects, based on the standard deviation calculated by the standard deviation calculation unit 33, the period during which the welding operation to be improved and the period during which the favorable welding operation are performed from among a plurality of periods for which the standard deviation has been calculated. Specifically, the selection unit 34 selects, as the period during which the welding operation to be improved and the period during which the favorable welding operation are performed, any period of any combination among a plurality of periods of a plurality of types of combinations of the welding robot 20 and the operator W. In the present embodiment, the period is selected from among the three most recent periods for which the standard deviation has been calculated. The selection unit 34 transmits information indicating the selected period to the local computer 40. Further, the selection unit 34 selects, based on the standard deviation calculated by the standard deviation calculation unit 33, the combination of the welding robot 20 and the operator W that performs the welding operation to be improved and the combination of the welding robot 20 and the operator W that performs the favorable welding operation. The selection unit 34 transmits information indicating the selected combination of the welding robot 20 and the operator W to the local computer 40. Specifically, the selection unit 34 selects, as the period during which the welding operation to be improved is performed, the period in which the standard deviation calculated by the standard deviation calculation unit 33 is the largest and exceeds a predetermined first threshold value P. Further, the selection unit 34 selects, as the period during which the favorable welding operation serving as a sample is performed, the period in which the standard deviation calculated by the standard deviation calculation unit 33 is the smallest and is less than a predetermined second threshold value Q. The first threshold value P and the second threshold value Q referred to for the selection of the period are set according to the input to the input device 41 described later. In the present embodiment, the first threshold value P is set to 8 and the second threshold value Q is set to 3, but they may be set to other values.

[0020] For example, when the standard deviation shown in FIG. 3 is calculated, as shown in FIG. 4, for product A, the selection unit 34 selects the combination of welding robot a and operator e as the combination of the welding robot 20 and the operator W that performed the welding operation to be improved. Also, the selection unit 34 selects period t-0 as the period during which the welding operation to be improved was performed on product A among periods t-2, t-1, and t-0. Further, the selection unit 34 selects the combination of welding robot c and operator g as the combination of the welding robot 20 and the operator W that performed a preferable welding operation as a sample for product A. Also, the selection unit 34 selects period t-0 as the period during which a preferable welding operation as a sample was performed on product A among periods t-2, t-1, and t-0. Furthermore, for product B, the selection unit 34 selects the combination of welding robot d and operator h as the combination of the welding robot 20 and the operator W that performed the welding operation to be improved. Also, the selection unit 34 selects period t-0 as the period during which the welding operation to be improved was performed on product B among periods t-2, t-1, and t-0. Also, since all of the obtained standard deviations for product B are 3 or more, the selection unit 34 does not select the period during which the welding operation as a sample was performed.

[0021] Also, when the standard deviation shown in FIG. 5 is calculated, as shown in FIG. 6, the selection unit 34 selects the welding robot a and the operator e as the combination of the welding robot 20 and the operator W that performed the welding operation to be improved for Product A. Also, the selection unit 34 selects the period t-0 as the period during which the welding operation to be improved was performed for Product A among the periods t-2, t-1, and t-0. Also, the selection unit 34 selects the welding robot a and the operator e as the combination of the welding robot 20 and the operator W that performed a preferable welding operation as a sample for Product A. Also, the selection unit 34 selects the period t-2 as the period during which a preferable welding operation as a sample was performed for Product A among the periods t-2, t-1, and t-0. Also, the selection unit 34 selects the period t-1 as the period during which a preferable welding operation as a sample was performed for Product C among the periods t-2, t-1, and t-0. Also, the selection unit 34 selects the welding robot c and the operator g as the combination of the welding robot 20 and the operator W that performed a preferable welding operation as a sample for Product C. Note that, for Product C, since all of the obtained standard deviations are 8 or less, the selection unit 34 does not select the period during which the welding operation to be improved was performed.

[0022] The setting unit 35 sets the length R of each period, the first threshold value P, and the second threshold value Q based on the setting signal sent from the local computer 40.

[0023] The local computer 40 includes an input device 41, a computer main body 42, and a display device 43.

[0024] The input device 41 receives the input of the user U who designates the length R of each period, the first threshold value P, and the second threshold value Q. The input device 41 is configured by a mouse, a keyboard, or the like.

[0025] The computer main body 42 transmits a setting signal corresponding to the input of the user U to the input device 41 to the setting unit 35 of the server 30.

[0026] The display device 43 is connected to the server 30 via the computer main body 42. The display device 43 displays information specifying the period selected by the selection unit 34 of the server 30 and the combination of the welding robot 20 and the operator W. The display device 43 is composed of a display or the like.

[0027] In the example of FIG. 4, for product A, as the combination of the welding robot 20 and the operator W that performed the welding work to be improved, the display device 43 displays the welding robot a and the operator e, and as the period during which the welding work to be improved was performed, it displays the period t-0. Further, for product A, as the combination of the welding robot 20 and the operator W that performed the exemplary welding work, the display device 43 displays the welding robot c and the operator g, and as the period during which the exemplary welding work was performed, it displays the period t-0. Furthermore, for product B, as the combination of the welding robot 20 and the operator W that performed the welding work to be improved, the display device 43 displays the welding robot d and the operator h, and as the period during which the welding work to be improved was performed, it displays the period t-0. Note that the display device 43 does not display the combination of the welding robot 20 and the operator W that performed the exemplary welding work and the period during which the exemplary welding work was performed for product B.

[0028] In the example of FIG. 6, for product A, the display device 43 displays the welding robot a and the operator e as the combination of the welding robot 20 and the operator W that performed the welding operation to be improved, and displays the period t-0 as the period during which the welding operation to be improved was performed. Further, for product A, the display device 43 displays the welding robot a and the operator e as the combination of the welding robot 20 and the operator W that performed the exemplary welding operation, and displays the period t-2 as the period during which the exemplary welding operation was performed. Furthermore, for product C, the display device 43 displays the welding robot c and the operator g as the combination of the welding robot 20 and the operator W that performed the exemplary welding operation, and displays the period t-1 as the period during which the exemplary welding operation was performed. Note that the display device 43 does not display the combination of the welding robot 20 and the operator W that performed the welding operation to be improved and the period during which the welding operation to be improved was performed for product C.

[0029] FIG. 7 is a flowchart for explaining the operation of the work evaluation system 1 configured as described above.

[0030] First, in step S101, the input device 41 of the local computer 40 receives the input from the user U who designates the length R of each period, the first threshold value P, and the second threshold value Q. Then, the computer main body 42 of the local computer 40 transmits a setting signal corresponding to the input of the user U to the input device 41 to the setting unit 35 of the server 30. The setting unit 35 of the server 30 sets the length R of each period, the first threshold value P, and the second threshold value Q according to this setting signal. Then, the information acquisition unit 31 waits for the start of operation of the welding robot 20. When the welding robot 20 starts operating, the information acquisition unit 31 acquires the start time of operation of the welding robot 20 and stores it in the database of the data memory 36. Then, the process proceeds to step S102. In the present embodiment, in step S101, it is assumed that the first start time of operation of the welding robot 20 is common in a plurality of combinations of the welding robot 20 and the worker W. Note that, in a plurality of combinations of the welding robot 20 and the worker W, a difference may be provided in the first start time of operation of the welding robot 20, and the information acquisition unit 31 may acquire the start time of operation of each welding robot 20 respectively.

[0031] In step S102, the information acquisition unit 31 waits for the end of operation of the welding robot 20. When the welding robot 20 finishes operating, the information acquisition unit 31 acquires the end time of operation of the welding robot 20 and stores it in the database of the data memory 36. Next, the information acquisition unit 31 waits for the start of operation of the welding robot 20. When the welding robot 20 starts operating again, the information acquisition unit 31 acquires the start time of that operation and stores it in the database of the data memory 36. Then, the process proceeds to step S103.

[0032] In step S103, the non-operation time calculation unit 32 calculates the cycle time of the welding operation, the operation time of the welding robot 20 during the welding operation, and the non-operation time of the welding robot 20 during the welding operation based on the operation start time and the operation end time of the welding robot 20 acquired by the information acquisition unit 31, and stores them in the database of the data memory 36. The cycle time can be calculated by subtracting the operation start time one before the most recent one from the most recent operation start time. The operation time of the welding robot 20 can be calculated by subtracting the operation start time one before the most recent one from the most recent operation end time. The non-operation time of the welding robot 20 can be calculated by subtracting the operation time of the welding robot 20 from the cycle time.

[0033] In step S104, the information acquisition unit 31 determines whether or not a period of length R has elapsed since the start of the operation of the welding robot 20 in step S101. If the information acquisition unit 31 determines that a period of length R has elapsed, the process proceeds to step S105. On the other hand, if the information acquisition unit 31 determines that a period of length R has not elapsed, the process returns to step S102.

[0034] In step S105, the standard deviation calculation unit 33 calculates the standard deviation of the non-operation time of the welding robot 20 calculated during the immediately preceding period of length R, and stores it in the database of the data memory 36.

[0035] The server 30 executes the operations of steps S102 to S105 in parallel for a plurality of types of combinations of the welding robot 20 and the operator W.

[0036] Next, in step S106, based on the standard deviations calculated in step S105 for multiple combinations of the welding robot 20 and the worker W, the selection unit 34 selects, from the three periods of the length of the most recent R for which the standard deviation was calculated, the period during which the welding operation to be improved was performed and the period during which a preferable welding operation was performed. In the present embodiment, the selection unit 34 selects the periods from the three most recent periods, but may select from two or four or more periods. The selection unit 34 transmits information indicating the selected periods to the local computer 40. Further, based on the standard deviation calculated in step S105, the selection unit 34 selects the combination of the welding robot 20 and the worker W that performed the welding operation to be improved, and the combination of the welding robot 20 and the worker W that performed a preferable welding operation. The selection unit 34 transmits information indicating the selected combination of the welding robot 20 and the worker W to the local computer 40. Specifically, the selection unit 34 selects, as the period during which the welding operation to be improved was performed, the period in which the standard deviation calculated in step S105 is the largest and exceeds the first threshold value P. Further, the selection unit 34 selects, as the period during which a preferable welding operation serving as a model was performed, the period in which the standard deviation calculated in step S105 is the smallest and is less than the second threshold value Q.

[0037] Next, in step S107, the display device 43 of the local computer 40 displays information specifying the period selected by the selection unit 34 of the server 30 and the combination of the welding robot 20 and the worker W.

[0038] The user U can confirm, by visually checking the display device 43, the period during which the welding operation to be improved was performed, the combination of the welding robot 20 and the worker W that performed the welding operation to be improved, the period during which the reference welding operation was performed, and the combination of the welding robot 20 and the worker W that performed the reference welding operation. The user U determines whether or not the combination of the welding robot 20 and the worker W that performed the welding operation to be improved is the same as the combination of the welding robot 20 and the worker W that performed the reference welding operation. If these combinations are the same, the user U checks the changes that occurred between the period during which the welding operation to be improved was performed and the period during which the reference welding operation was performed, and considers countermeasures. On the other hand, if these combinations are not the same, the user U interviews the work contents of the welding robot 20 and the worker W that performed the reference welding operation, and conveys them to the worker W who performed the welding operation to be improved and the reference welding operation. Also, the user U compares the procedures of the reference welding operation and the welding operation to be improved to investigate the cause. And when the most recent welding operation is the one to be improved, the user U takes countermeasures for improvement. The user U repeatedly causes the operation evaluation system 1 to execute the operations of steps S101 to S107 until the period during which the welding operation to be improved was performed and the combination of the welding robot 20 and the worker W are no longer displayed on the display device 43.

[0039] Since the non - operating time of the welding robot 20 includes the time when the worker W works with the welding robot 20 stopped, it is likely to vary. When the selection by the selection unit 34 of the period and the combination of the welding robot 20 and the worker W is made based on the maximum value, minimum value, or average value of the non - operating time of the welding robot 20, such variations cannot be reflected in the selection. In the present embodiment, since one of the variations in the cycle time of the operation including the non - operating time of the welding robot 20 and the variations in the non - operating time of the welding robot 20 is reflected in the selection by the selection unit 34 of the period and the combination of the welding robot 20 and the worker W, the period during which the welding operation having a predetermined property was performed and the combination of the welding robot 20 and the worker W can be specified more appropriately.

[0040] In the present embodiment, the standard deviation is used as the variation. However, instead of the standard deviation, other indices indicating the degree of dispersion, such as variance, may be used.

[0041] Further, in the present embodiment, the selection unit 34 selects the combination of the period during which the welding operation to be improved was performed and the period during which the preferable welding operation was performed, and the welding robot 20 and the worker W, based on the variation in the non-operating time of the welding robot 20. However, the selection unit 34 may perform the selection based on the cycle time of the welding operation. When the variation in the operating time of the welding robot 20 is small, since the variation in the non-operating time is reflected in the cycle time of the welding operation, the selection unit 34 can make an appropriate selection by referring to the cycle time of the welding operation.

[0042] Further, in the present embodiment, the selection unit 34 selects both the period during which the welding operation to be improved was performed and the period during which the preferable welding operation was performed. However, the selection may be made for only one of the periods.

[0043] Further, in the present embodiment, the facility is the welding robot 20 which is a production facility. However, it may be other facilities that perform a predetermined operation together with the worker W. Further, the operation repeated by the facility and the worker W is the welding operation which is a production process. However, it may be other operations.

Industrial Applicability

[0044] The work evaluation system, display device, and work evaluation program of the present disclosure can more appropriately identify the period during which a work having a predetermined property was performed, and are useful as a work evaluation system, display device, and work evaluation program for evaluating the improvement of a predetermined work repeated by a facility and a worker.

Explanation of Reference Numerals

[0045] 1 Work evaluation system 20 Welding robot (facility) 30 Server (computer) 41 Input device 43 Display device U User W Worker P First threshold value Q Second threshold value R Length of period T1, T2, T3 Cycle time t11, t21, t31 Start time of operation t12, t22, t32 End time of operation T12, T22, T32 Non - operating time

Claims

1. including the work of the operator in a state where the equipment is stopped, and for each predetermined work repeated by the equipment and the operator, obtaining the operation start time of the equipment, calculating, based on the obtained operation start time, for a plurality of periods, one of the variations in the cycle time of the work and the variation in the non-operation time of the equipment during the work, a computer that selects one of the plurality of periods based on the calculated variation, and a display device that displays information identifying the period selected by the computer, characterized in that the work evaluation system comprises the same.

2. In the work evaluation system according to claim 1, the computer further obtains the operation end time of the equipment for each of the repeated works, wherein the one variation is a variation in the non-operation time of the equipment during the work, characterized in that the work evaluation system comprises the same.

3. In the work evaluation system according to claim 1, the computer performs the acquisition of the operation start time for the work repeated by a plurality of types of combinations of the equipment and the operator, performs the calculation of the variation for the plurality of periods for a plurality of types of combinations of the equipment and the operator, and the selection of a period by the computer is to select one of the periods of any one of the plurality of types of combinations of the equipment and the operator, characterized in that the work evaluation system comprises the same.

4. In the work evaluation system according to claim 3, the selection of a period by the computer is to select at least one of the periods in which the calculated variation exceeds a predetermined first threshold value and the periods in which the calculated variation is less than a predetermined second threshold value, characterized in that the work evaluation system comprises the same.

5. In the work evaluation system according to claim 4, further comprising an input device for receiving user input, wherein, among the first threshold value and the second threshold value, the threshold value referred to for the selection of the period by the computer is set according to the input to the input device, characterized in that the work evaluation system comprises the same.

6. In the work evaluation system according to claim 1, further comprising an input device for receiving user input, wherein the length of the period is set according to the input to the input device, characterized in that the work evaluation system comprises the same.

7. including the work of an operator with the equipment stopped, obtaining the operation start time of the equipment for each predetermined operation repeated by the equipment and the operator, calculating, for a plurality of periods, one of the variations in the cycle time of the operation and the variation in the non-operation time of the equipment during the operation based on the obtained operation start time, connected to a computer that selects one of the plurality of periods based on the calculated variation, A display device characterized by displaying information identifying the period selected by the computer.

8. In a computer, including the work of an operator with the equipment stopped, causing the operation start time of the equipment to be obtained for each predetermined operation repeated by the equipment and the operator, causing, for a plurality of periods, one of the variations in the cycle time of the operation and the variation in the non-operation time of the equipment during the operation to be calculated based on the obtained operation start time, A work evaluation program characterized by causing one of the plurality of periods to be selected based on the calculated variation.

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