JPH05282320A - Work scheduling method - Google Patents

Abstract

PURPOSE:To obtain a high precise work scheduling for all subject processes of a scheduling in a short time by calculating a working time and a set-up time or the like by a simulation, setting a completion time and a selected lot as a processing lot, storing the completion lot in a storage medium as a fore stock, and referring to the data at the time of the next scheduling. CONSTITUTION:The simulation of a time lapse management by the working of the subject process of the scheduling is operated (S105), and the obtained stock content and working condition are registered in a storage medium (S106). Then, the material to be treated next is selected, and the scheduling is operated (S107) by referring to the registered content, based on the stock content and the completed material of each process according to a specific rule in consideration of time for delivery or a lot constraint. And also, at the time of starting the simulation, a pipe manufacture schedule and in-factory intermediate device content are inputted (S101 and S102), and used as the working condition and initial stock data (S103 and S104).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work scheduling method for creating a scheduling for each process with high accuracy and in a short time.

[0002]

2. Description of the Related Art Conventionally, a work schedule is created by a person in charge selecting materials according to the priority order at that time and manually calculating work time.

[0003]

However, in the above-mentioned conventional technique, the schedule creation is limited to a specific process due to the time constraint, and the calculation of the work time is performed in order to shorten the calculation time. Calculation is performed using a fixed value such as an average value, and a fixed value is also used for the setup change time.Because of the large amount of data required to create a schedule, there is a limit to how much material can be selected by human judgment, The created schedule has low accuracy and there are many obstacles to execute it.

An object of the present invention is to provide a work scheduling method capable of creating a schedule with high accuracy and in a short time.

[0005]

In order to achieve the above-mentioned object, the present invention simulates time lapse management due to the operation of a process to be scheduled, and stores the inventory contents and the operation status obtained thereby. Register on the medium, refer to the registered contents, and select the material to be processed next based on the inventory contents and completed materials for each process according to the unique rule considering the delivery date and lot constraint for each process and perform scheduling I am trying.

[0006]

According to the above means, the operating time, the setup time, etc. are calculated by simulation based on the data of the lot selected in the scheduling, and the completion time and the selected lot are treated as the processing lot, and the completed lot is processed. Is stored in the storage medium as the front inventory, and this data is referred to in the next scheduling. As a result, highly accurate work scheduling can be obtained in a short time for all the processes to be scheduled.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a flow chart showing the processing of the work scheduling method according to the present invention. Here, an example applied to manufacturing in the steel industry is shown.

As data, data of a process (the pipe-making schedule in this embodiment) 1 of a process which is the first process to be performed among processes to be scheduled, and data representing the contents of in-process / intermediate work (simulation start) Sometimes there is an initial stock) 2. First, data 1 is input (S1
01), this is stored in the storage medium (for example, semiconductor memory) in the system (S102). Then, data 2 is input (S103) and stored in the memory (S103).
104). In addition to the above-mentioned input data, this memory stores the inventory contents (inventory location, details, etc.) and the operating status (in-process materials of each process) associated with the processing after the simulation is started.

Then, a simulation is executed based on the input data (S105). This process is
The content of the selected material selected by the pipe making schedule or scheduling function is transmitted, and the operating time and setup time are calculated and the next processing completion process is determined from the equipment efficiency value, the actual operation value, and the recombination time table of each material. It manages the passage of time due to the operation of the process. As for the simulation result executed here, the inventory and the change in processing are registered in the memory upon completion of the simulation (S106).
The registered contents are the location of the stock, the contents of the stock showing the details, and the operating status showing the material being processed in each process.

Further, scheduling is performed with reference to the contents stored in the memory (S107). In this scheduling, the next processing material is selected from the inventory by referring to the inventory content and operation status stored in the memory.
In order to make such a selection, a rule in consideration of delivery date and lot constraint is possessed for each process to be scheduled. It should be noted that when there are no more scheduling targets (S108), the process is terminated.

FIG. 2 is a timing chart showing timings associated with execution of scheduling and simulation according to the present invention.

In FIG. 2, the vertical axis represents the process to be scheduled and the horizontal axis represents time. The mark Δ on the horizontal axis indicates the end of processing of a certain material in the steps of pipe making, annealing, cold drafting, etc., that is, the time when the simulator according to the present invention grasps the process status.

In the example of the figure, in the pipe making process, the processes are executed in the order in which the data of the pipe making schedule is arranged. First, the working time a21 of the manufacturing number "4231-1" is calculated,
If the time advances by a21, the next manufacturing number "4231-
The setup change time a11 is calculated from the difference between the specification value such as "2" and the dimension value. Next, when the time advances by a11, the working time a22 of the manufacturing number "4231-2" is calculated, and a2
If the time advances by 2, the next manufacturing number "4235-
The setup change time is calculated from the difference between the specification value and "1". If there is no difference in the specification values, the time advances by 0 hours, the working time a23 of the manufacturing number “4235-1” is calculated, and a23
If it advances only by, the setup change time is calculated from the difference of the specification value with the next manufacturing number "4240-1". When the time advances by the calculated setup change time, the working time a24 of the manufacturing number “4240-1” is calculated, and when the time advances by 24, the difference in the specification value with the next manufacturing number “4240-2” is calculated. The setup change time a12 is calculated. Further, when the time advances by a12, the working time a25 of the manufacturing number “4240-2” is calculated, and when the time advances by a25, the pipe making process operation, setup change, and suspension are performed in the same procedure. Be seen.

When the simulation of step 105 is performed to calculate the operating time and setup time for the process for processing the selected material and to determine the next process completion process, the inventory and process associated with the process completion are stored in the memory. Change registration is performed (S106). The processes of steps 105 to 107 described above are periodically executed until an arbitrary simulation end time, so that the schedule of each process, the scheduled time of the passing process for each material, the transition of the stock amount by process, and the operation of each process The results of the statistics are predicted.

Next, in the annealing step, first, like the manufacturing number "4231-1" in the pipe making step, the data in the memory is referred to at the time of starting the simulation, and the manufacturing number "3888-1" is used in accordance with the selection rule of the annealing step. Is selected, the working time b21 is calculated, and the time advances by b21. Next, referring to the changed in-memory data, the manufacturing number "3890-
1 ”is selected, and the setup change time b11 is calculated from the difference between the previous manufacturing number“ 3888-1 ”and the specification values such as temperature and dimensions. Next, when the time advances by b11, the working time b22 of the manufacturing number "3890-1" is calculated, and
Only time advances. Then, referring to the changed data in the memory, the manufacturing number "3890-2" is selected according to the selection rule of the annealing process, and the manufacturing number "389" before is selected.
The setup change time is calculated from the difference between the specification values of "0-1".

Next, when the time advances by the calculated setup change time, the working time b23 of the manufacturing number "3890-2" is calculated, and the time advances by b23. Further, referring to the changed data in the memory, the manufacturing number "4231-1" is selected according to the selection rule of the annealing process, and the setup change is performed from the difference in the specification value from the previous manufacturing number "3890-2". Calculate time b12. Then, when the time advances by b12, the working time b24 of the manufacturing number "4231-1" is calculated, and the time advances by b24. After that, the annealing process is started, set up, and stopped in the same procedure.

Next, in the cold drafting process, first, like the production number "4231-1" of the pipe making process, the data in the memory is referred to, and the production number "4421-1" is selected according to the selection rule of the cold drafting process. When selected, the working time c21 is calculated, and the time advances by c21. Next, referring to the changed data in the memory, if there is no stock in this step, one piece of material is sent from another step as a lack of material. Or pause until the time when the quantity exceeds a certain amount. After that, referring to the data in the memory changed at that time, the manufacturing number "3850-1" is selected according to the selection rule of the cooling and drafting process, and the dimensions such as the dimensions of the previous manufacturing number "4421-1" are selected. The setup change time c11 is calculated from the difference between the original values. Then,
When the time advances by c11, the manufacturing number "3850-
The working time c22 of "1" is calculated, and the time advances by c22. After that, the cold drafting process is operated, set up, and stopped in the same manner. The above-described processing is performed at the time point marked with Δ for all the processes to be scheduled.

FIG. 3 shows an example of processing in the annealing step in the logic of each step executed at the time point marked with Δ in FIG.

First, if there is a stock in the annealing process at the start of the simulation or when the processing of a certain material in the annealing process is completed, the data in the memory is referred to. If there is no stock, one piece is sent from another process as a shortage. Alternatively, it pauses until the time when the number exceeds an arbitrary number.
Data 1 and data 2 (S101 and S10) are stored in the memory.
The completed lot representing the operating status (input in 3) is registered.
In the example of FIG. 3, the inventory content 301 is 1) in the leftmost column,
2), 3) ... represent lots (materials) to be processed, and details of the processing method and dimensions for each lot are listed at the right end in order of temperature rank, lot number, temperature, outer diameter, The thickness and delivery date of the process. For example, in the case of the lot of 1), the temperature rank in the annealing step belongs to the high temperature category, the lot number is “0810”, the processing temperature is 920 degrees Celsius,
Processing speed is 16.0 m / min, outer diameter is 50.8 m
m, the wall thickness is 1.5 mm, and the process delivery date is October 1st. In addition, the completed lot 30 that indicates the operating status
2 means the most recently processed lot in the annealing process. In the illustrated completed lot, the temperature rank is high, the lot number is "0792", and the processing temperature is 9 degrees Celsius.
20 degrees, processing speed 16.0 m / min, outer diameter 4
It shows that the thickness is 2.7 mm, the wall thickness is 2.6 mm, and the process delivery date is October 1st. The selected lot 304 is selected according to the selection rule 303 with reference to the inventory contents of 301 and the operation status of 302 (S107).

In the example of FIG. 3, in the annealing process, when the completed lot 302 has the same temperature rank, lot number, processing temperature, processing speed, outer diameter, and wall thickness, and the process delivery time is the smallest, Priority is the highest. If the temperature rank to the outer diameter are the same and the wall thickness is the minimum, the second
It becomes the priority order, and if the thickness and the delivery date of the process are the smallest and the others are the same, the third priority order is given. In addition to these, when the selection rule in the high temperature mode of the annealing process is selected and the priority is the lowest and there is no work in progress in the high temperature mode, the selection rule is switched to the low temperature mode. If there is no work in progress in the low temperature mode, the material shortage is stopped. In the case of an inventory content such as 301 and a completed lot such as 302, the selected lot has a high temperature with the same temperature rank and the lot number is “0”.
792 ", the speed is 16.0 m / min, and the outer diameter is 47.0 mm, which is the largest 3) lot, and the rule of priority 3 is selected.

Next, the working time is calculated from the weight and size possessed by the selected lot, the T / Hr (efficiency) of 305, and the actual operation rate, and the dimensions of the completed lot 302 and the selected lot 304 are calculated. The setup change time is calculated from the difference between the specification values and the change time table / expression of 306 (S10).
5). Completion time is calculated from these work time and setup change time, and this is registered in the memory. Further, the selected lot is registered as the in-process lot, and the completed lot is registered and changed as the front stock of the next process (S106). When the above process is completed, look for the next completed process, advance the time,
In the same procedure as the annealing process, lot selection and calculation of work time and setup change time are repeatedly executed according to the selection rule of the process until the end of the simulation.

[0023]

As described above, according to the present invention, the elapsed time management due to the operation of the process to be scheduled is simulated, and the inventory contents and the operation status obtained thereby are registered in the storage medium. The scheduling target is selected because the material to be processed next is selected based on the stock content and completed material of each process according to the unique rules that take into account the delivery date and lot constraint for each process. Therefore, highly accurate work scheduling can be obtained in a short time for all the processes.

[Brief description of drawings]

FIG. 1 is a flowchart showing a process of a work scheduling method according to the present invention.

FIG. 2 is a timing chart showing timings associated with execution of scheduling and simulation according to the present invention.

FIG. 3 is an example of processing in an annealing step in the logic of each step executed at the time point marked with Δ in FIG.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuhiro Isomura 1 Kimitsu, Kimitsu-shi, Chiba Nippon Steel Corp. Kimitsu Works Ltd.

Claims (1)

[Claims] 1. A simulation of time lapse management due to the operation of a process to be scheduled, and the inventory contents and operation status obtained by the simulation are registered in a storage medium,
It is characterized by selecting the material to be processed next based on the inventory content and completed material of each process according to a unique rule considering the delivery date and lot constraint for each process with reference to this registered content Work scheduling method.