JPH09201747A - Extraction method of delay process - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a novel method capable of automatically extracting a delay process among work processes assigned to a plurality of machine tools. SOLUTION: The start time of each work process, the progress status at the current time, the completion time (current time if in the execution state), and the work completed part number (the work completion part number up to the current time in the execution state) Is entered in the computer as record information, and when it becomes necessary to manage the work process, the computer determines the progress status of each work process, and when it is in the completed state, the completion time and the scheduled completion Extract the delay process by comparing the time with the electronic computer, and, if in the execution state, with the electronic computer to calculate the expected completion time of the process based on the number of work completed parts up to the current time,
The delay process is extracted by making the computer compare the estimated time and the scheduled completion time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of extracting a delay process which is suitable for a production line using many automatic machine tools.

[0002]

2. Description of the Related Art In a production line where various parts are machined (for example, press, cutting, forming, forging, etc.) by selectively using a plurality of automatic machine tools having the same or different functions, a delay is caused against a plan. It is necessary to find out and manage the work processes that are being performed. This kind of management can be performed by using an electronic computer system configured by a commercially available personal computer or workstation, and some methods have already been proposed. A typical example thereof is a method in which plan information and actual result information of each work process are displayed as a Gantt chart on a display of an electronic computer, and the chart is observed to find a delay process.

In the Gantt chart, it is usual to display individual work processes in the form of a plurality of rectangular time frame frames extending along the time axis of the display. The beginning of the time frame is
The start time or the scheduled start time of the work process is shown, and the end thereof shows the completion time or the scheduled completion time of the work process. Therefore, for each work process, it is possible to find a delay process by creating a time frame representing the plan information and a time frame representing the actual result information and arranging them side by side.

However, in a production line using a large number of machine tools, the number of time frame on the Gantt chart is very large, and it is often difficult to visually detect the delay process. Moreover, in the case of a work process in the completed state, it is possible to determine whether or not the process is delayed, but in the case of a work process in the execution state, this type of determination is difficult. There is.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems of the prior art and to provide a novel method capable of automatically extracting a delay step.

[0006]

In order to solve the above problems, according to the present invention, a scheduled start time, a scheduled completion time and a scheduled work number of each work process are registered in advance in a computer as plan information. In addition, the start time of each work process, the progress status at the current time, the completion time (current time when the work process is in the execution state), and the work completed part number (the current time when the work process is in the execution state) The number of completed parts up to) is input to the computer as performance information. Then, when it becomes necessary to manage the work process, the computer is made to judge the progress status of each work process based on the record information, and when any work process is in the completed state, the work process is completed. The delay process is extracted by comparing the time and the scheduled completion time with an electronic computer. On the other hand, if any work process is in the execution state, the expected completion time of the process based on the number of work completed parts up to the current time. Is calculated by the electronic computer, and the delay process is extracted by making the electronic computer compare the estimated time and the scheduled completion time of the work process. For the actual information, the results collected individually by the workers on the production line can be used,
When a predetermined sensor is provided on each machine tool, it is convenient because necessary performance information can be automatically collected and input to the electronic computer.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The identification of the extracted delay process can be easily performed by changing the color scheme of the relevant time frame on the Gantt chart to another time frame, and a list of the delay processes can be displayed. It can be easily performed by drawing on a display or printing out by a printer or the like. Hereinafter, a method of extracting a delay process according to the present invention will be described in more detail with reference to the embodiments shown in the drawings.

[0008]

EXAMPLE FIG. 1 shows an example of an electronic computer system used in this example. The hardware configuration itself of this system is already known and can be configured using a commercially available personal computer, workstation, or the like. A work process planning table 5 (hereinafter simply referred to as “planning table”) and a work process actual result table 6 (hereinafter simply referred to as “actual result table”) are registered in the disk device 4 of the electronic computer. The central processing unit 1 operates under the control of the work process management program 3 stored in the memory 2 of the same device, and has a plan table 5 and a performance table 6
Is read out and necessary arithmetic processing is performed, and the result is displayed on the display 7 as a Gantt chart.

An example of the plan table is shown in FIG. A preset plan for each work process is entered in each row of the table. For example, the first row indicates the machine tool BP.
-1 indicates that there is a plan to perform drilling on the two parts P-MR-101 in the time zone from 9:00 on April 1, 1995 to 11:00 on the same day. The administrator can edit the plan table (input required data, etc.) using a mouse or a keyboard.

An example of the performance table is shown in FIG. The “progress status” column in the first column of the table is a column for recording the progress status of each work process at the current time, and when it is in the completed state at the current time, for example, enter the symbol “1” In the case of being in the execution state, the symbol "3" is input, for example. The actual start time of each work process is input in the “start time” column of the fifth column. In the “completion time” column of the sixth column, the actual completion time of each work process (current time in the case of a work process in the execution state) is entered. In the “work completed parts number” column of the sixth column, the number of parts for which the work in each process is completed (in the case of a work process in the execution state, the work completed parts number up to the current time) is entered. Similar to the plan table, the administrator can edit the result table using the mouse or keyboard.

The first row of the performance table illustrated in FIG. 3 is
This means that the drilling work has been completed for the two parts as scheduled by the scheduled time (11:00 on April 1). The second line shows that the cutting work was completed for the two parts as planned, but the completion time was 15:00 on April 1st, which was one hour later than the scheduled time (14:00 on April 1st). ing. The third line indicates that the molding work has been performed on the six parts by the current time (13:30 on April 1) and is still in the execution state. The fourth line indicates that the assembly work for the two parts has been completed as scheduled by 11:30 on April 1 30 minutes earlier than the scheduled time (12:00 on April 1).

An example of a Gantt chart created by the central processing unit under the control of the process control program is shown in FIG.
The vertical axis of this chart shows the code of the machine tool used, and the horizontal axis shows the work process by each machine tool as a rectangular time frame. In addition,
In the case of the present embodiment, the work processes are arranged such that the planned time frame 401 is located on the upper side and the actual time frame 402 is located on the lower side.

The procedure for extracting the delay process will be described with reference to FIG. 5. The central processing unit operates under the control of the work process management program and selects any one work process (step 51). Then, it is determined whether the process is in the completed state or the executed state by referring to the progress column of the achievement table (step 52). If it is in the completed state, the number of work completed parts input in the actual result table is compared with the number of scheduled work parts input in the plan table (step 53). If the number of completed parts is less than the planned number,
The process is determined to be a delay process, and the work process is extracted and a warning is issued by changing the color scheme of the relevant time slot frame among the plurality of actual time slot frames 402 on the Gantt chart in FIG. 4 (step 54). ). If the number of work-completed parts has reached the planned number, the completion time input in the actual result table is compared with the scheduled completion time input in the plan table (step 55). When the completion time is later than the scheduled time, the process is determined to be a delay process, and the work process is extracted and a warning is issued as in the case described above (step 5).
4). On the other hand, if the completion time matches the scheduled time or is earlier than the scheduled time, it is determined whether or not there are unchecked work steps (step 56). If there is an unchecked work process, the process returns to step 51 and the same process is repeated. If there is no unchecked work process, the process ends.

When it is judged in step 52 that the selected work process is still in the execution state, it is judged whether or not the record information of the work process is entered in the record table (step 57), and it is not entered. If so, go to step 56. On the other hand, when the record information is entered in the record table, the work time from the start time of the process to the current time is calculated, and the time is divided by the number of work-completed parts to work on one part. The required time is calculated, and the expected completion time of the process is calculated based on the result (step 58). Then, the estimated time is compared with the scheduled completion time input in the plan table (step 59), and when the estimated time is later than the scheduled time, the work process is determined to be the delay process, and the same as the above case, A process is extracted and a warning is given (step 54). On the other hand, if the estimated time matches the scheduled time or is earlier than the scheduled time, the process proceeds to step 56.

According to the plan table illustrated in FIG. 2 and the performance table illustrated in FIG. 3, the work process of the second row and the work process of the third row are actually delayed or may be delayed. These work steps are shown in the Gantt chart of FIG.
The color scheme of 02 is changed so that the administrator can identify the delay process very easily.

[0016]

As described above, according to the present invention, it is possible to automatically extract, from the work processes assigned to each of a plurality of machine tools, a work process that is currently delayed or may be delayed. It is possible to efficiently execute work plan correction.

[Brief description of drawings]

FIG. 1 is a system diagram showing an electronic computer system used in an embodiment of the present invention.

FIG. 2 is an array diagram showing an example of a work process plan table adopted in the embodiment of the present invention.

FIG. 3 is an array diagram showing an example of a work process result table adopted in the embodiment of the present invention.

FIG. 4 is an array diagram showing an example of a Gantt chart displaying a result of extracting a delay process according to the present invention.

FIG. 5 is a flowchart for explaining a procedure of a delay process extraction method according to the present invention.

[Explanation of symbols]

 1: Central Processing Unit 2: Memory 3: Process Management Program 4: Disk Device 5: Work Process Planning Table 6: Work Process Actual Table 7: Display 401: Planned Time Frame 402: Actual Time Frame

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Akihiro Oyama Inventor Akihiro Oyama 2-2 Kagahara, Tsuzuki-ku, Yokohama, Kanagawa Inside Hitachi Business System Development Center (72) Inventor Tomonori Kihashi 890 Kashimada, Saiwai-ku, Kawasaki-shi, Kanagawa No. 12 Hitachi Ltd. Information Systems Division (72) Inventor Masato Sakata 890 Kashimada, Kawasaki City, Kanagawa Prefecture 12 No. 12 Hitachi Information Systems Division (72) Inventor Shuichi Kanai Sachi-ku, Kawasaki City, Kanagawa Prefecture 12 890 Kashimada, Information Systems Division, Hitachi, Ltd.

Claims (1)

[Claims] 1. A scheduled start time, scheduled completion time, and scheduled work number of each work process are registered in a computer in advance as plan information, and the start time of each work process, the progress status at the current time, and the completion time. (When the work process is in the execution state, the current time) and the number of work completed parts (when the work process is in the execution state, the number of work completed parts up to the current time) are input to the computer as record information. ,
When it becomes necessary to manage work processes, let the computer determine the progress status of each work process based on actual information,
If any work process is in the completed state, the delay time is extracted by comparing the completion time and the scheduled completion time of the process with the electronic computer, while if any work process is in the executed state, To have the electronic computer calculate the expected completion time of the process based on the number of work completed parts up to the current time, and to compare the expected time and the scheduled completion time of the work process with the electronic computer to extract the delay process. And a method for extracting a delay step.