JP2004046308A - Process load control device and method, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To create a practical production plan even for multiproduct processes with many operational constraints. <P>SOLUTION: A process information memory 21 and a product information memory 22 read in process information 11 and product information 12. An inter-process lead time setting part 31 and a unit load calculation part 32 calculate an inter-process lead time and a unit load from the process information. A load stacking part 33 stacks loads on a work allocation table 23 according to the process information and the product information. A load unstacking part 34 moves loads while an inter-process lead time determination part 34a ensures the inter-process lead time. About a long-term plan thus obtained, under determination by a segment end condition determination part 38, a load collection part 36 and a load distribution part 37 perform load collection and load distribution in order of product priority given by a processing priority setting part 35 to create a schedule. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a process load adjusting device and method, and a program for creating a production plan in a case where a wide variety of products are produced on a production line including multiple processes. In particular, by dividing the time axis into discrete sections (segments), and adjusting the load in each segment for each process within the range of the process capability, the process load for a relatively long term can be obtained. The present invention relates to an adjustment device and method, and a program.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in preparing a long-term production plan when a multi-product is manufactured on a production line including multiple processes, the time axis is divided into discrete sections (segments), and the load of each segment is set for each process. (Load pile, load pile collapse) is used.
[0003]
For example, Japanese Unexamined Patent Publication No. 9-26994 discloses a process load prediction method and an apparatus for executing the same, in which a segment is defined as one day.
(1) Based on the process sequence necessary for manufacturing an order and the load time in each process, a load of each process × segment is piled up.
(2) If the load exceeds the time (capacity) set for the segment, the hillslide is performed on the immediately preceding processing day in order from the order with the latest delivery date.
(3) The processing specifications that can be processed in the process are set in advance for each day, and if the specifications are not satisfied, the load is crushed in the same manner as in (2).
As a result, the load can be adjusted in consideration of the process capability and the specific operation method without creating a detailed schedule.
[0004]
In the above-described conventional method, as a calculation result of a long-term plan (load pile, load collapse), a workable time zone of a process required for manufacturing each product is given by a segment width. When creating a schedule based on this, an executable schedule is created for work in the same segment. In other words, if the segment is on a daily basis, a long-term plan will create a one-day plan, and a schedule plan will use the work allocated within the one-day frame obtained in the long-term plan. Determine the work order for the day. If the constraints on the work order are weak, a practical plan can be obtained in this way.
[0005]
[Problems to be solved by the invention]
However, in a line that handles a large variety of products, it is necessary to summarize the same processing specifications (lot aggregation) and adjust the processing order in consideration of the setup work (arrangement order control) according to the operating conditions unique to the process. In such a case, a practical schedule is not always obtained even if lot summarization and arrangement order control are performed only for works included in the same segment. Therefore, since the actual schedule is created by changing the segment that was originally scheduled for the work, the opportunity loss due to a delivery delay or a shortage of materials in the neck process is likely to occur. If the width of the segment is set wider, the degree of freedom in lot grouping and arrangement order control increases, but the accuracy as a long-term plan deteriorates. For example, when the required process of a certain product is 10 processes, if the segment width is set to 1 day, the manufacturing lead time is at least 10 days, but if the segment is set to 3 days, the manufacturing lead time is at least 30 days. It becomes. As described above, in the conventional method, it is difficult to achieve both the accuracy of the long-term plan and the accuracy of the schedule plan in a multi-product process in which operation restrictions are strong.
[0006]
Therefore, one object of the present invention is to provide a process load adjusting device and method capable of creating a long-term plan that can increase the accuracy when linked to a schedule plan, even in a multi-product process with many operational constraints, and To provide a program.
[0007]
A further object of the present invention is to provide a process load adjusting apparatus and method capable of creating a long-term plan that can reduce a calculation load required for creating a schedule plan with little correction when transferring a long-term plan to a schedule plan, As well as providing programs.
[0008]
A further object of the present invention is to provide a process load adjusting device and method, and a program, which can create a schedule that is consistent with a long-term plan.
[0009]
[Means for Solving the Problems]
According to an aspect of the present invention, there is provided a process load adjusting apparatus for storing a product information storing a quantity to be manufactured for a plurality of types of products manufactured through a plurality of processes for each type. Means, for each type, a predetermined order of steps to be passed for manufacturing the type, a load amount corresponding to a unit operation in each step, and a period in which the work related to each step can be allocated to the predetermined type. Process information storage means for storing process information including a work allocatable period represented by the number of segments divided by time width, and, for each of a plurality of segments, the work capacity in the segment and the load amount in the segment Work assignment table storage means for storing a work assignment table registered for each process, and a load amount and work corresponding to the unit work stored in the process information storage means. A unit load amount calculating means for calculating a unit load amount which is a load amount corresponding to a unit work assigned per segment within the work allocatable period for each product type and process based on the assignable period; Register the load amount obtained by adding the unit load amount assigned to each segment within the allocatable period for each process for all types in consideration of the quantity to be manufactured stored in the product information storage means in the work allocation table. Load stacking means for performing load stacking, and until the load amount registered in each segment of the work assignment table by the load stacking means becomes equal to or less than the work capacity of the segment stored in the work assignment table storage means. , The segments having a higher load ratio to the work capacity stored in the work assignment table And a load mountain collapsing means for load mountain break to move to another segment of the load amount registered in the allocation table in units of the unit load.
[0010]
A process load adjusting method according to claim 14 of the present invention includes a product information storing step of storing, for each type, a quantity to be manufactured for a plurality of types of products manufactured through a plurality of processes; The order of the processes that pass through to manufacture the product type, the load corresponding to the unit work in each process, and the number of segments that are divided into predetermined time widths during which the work related to each process can be allocated A process information storage step for storing process information including a work allocation possible period represented by, and a work allocation table in which, for each of a plurality of segments, the work capacity in the segment and the load amount in the segment are registered for each process. Based on the work allocation table storing step to store and the load amount and the work allocable period corresponding to the unit work stored in the process information storing step, A unit load amount calculating step of calculating a unit load amount which is a load amount corresponding to a unit work assigned per segment within the work allocatable period for each type and process, and assigned to each segment within the work allocatable period A load stacking step of performing a load stacking of registering in the work allocation table the load amount added for each process for all types in consideration of the quantity to be manufactured stored in the product information storing step, The work capacity stored in the work assignment table until the load amount registered in the segment of the work assignment table in the load stacking step becomes equal to or less than the work capacity of the segment stored in the work assignment table storage step. The segments with a large load ratio are registered in the work assignment table with priority. And a load mountain collapsing step of load peaks breaking moved to other segments load in units of a unit amount of load are.
[0011]
A program according to a twenty-seventh aspect of the present invention is a program for causing a computer to function as the process load adjusting device according to the first aspect.
[0012]
According to these configurations, the load adjustment is performed on a segment basis for each passing step for each product. In addition, work is assigned to a plurality of segments corresponding to the work assignable period. Therefore, it is possible to give the degree of freedom of work assignment to the time width of the segment or more while performing the load adjustment set by the time width of the segment. For this reason, lot planning and order control can be easily performed at the time of planning in the execution system (schedule planning), so that production costs can be reduced and quality can be stabilized. Further, once all the operations are assigned to the segments, the load is moved (hillslide) with the unit load amount as a unit from the segment with the higher load. Therefore, the load can be adjusted efficiently.
[0013]
In other words, according to the present invention, even in a multi-product process with many operational restrictions, it is possible to efficiently create a long-term plan that can enhance the accuracy when linked to a schedule plan. In addition, when the long-term plan created in this manner is transferred to the schedule plan, only a small amount of correction is required, so that the calculation load required for creating the schedule plan can be reduced.
[0014]
In the present invention, the unit load amount may be calculated as: unit load amount = load amount corresponding to unit work in each process / work assignment possible period (claims 2, 15, 28).
[0015]
According to this configuration, for each passing process for each product, a uniform load amount is added to the segment corresponding to the allocatable period. The total amount of load added to each segment is equal to the amount of load in the process. This makes it possible to evaluate the process load when work is allocated with equal probability to segments within the allocatable period.
[0016]
In the present invention, the work assignable period may be determined based on the process information or the product type (claims 3, 16, 29).
[0017]
According to this configuration, different work allocatable periods are set depending on the process information and the product type. As a result, in the process of performing lot batching and arrangement order adjustment, the assignable period is set longer, or the general-purpose type is easily integrated into lots, so the assignable period is set shorter, and the special type is assigned. Practical settings can be made in accordance with process information and product characteristics, such as setting a longer possible period.
[0018]
Further, according to the present invention, when the load amount registered in the work allocation table is moved to another segment in the load crushing, if the load amount is moved backward, it corresponds to a product having a spare delivery date. In the case of giving priority to the load amount and moving the load in the forward direction, the load amount corresponding to the product having a margin at the early re-start time may be given priority (claims 4, 17, 30).
[0019]
According to this configuration, when the load in a certain segment in a certain process is crushed, the time interval between the work start segment and the end segment in the post-movement state is calculated as a movement penalty. At this time, priority is given to the movement of the load with a small movement penalty. Thereby, it is possible to prevent the operable segments of the same product from being scattered due to the load landslide. That is, the load can be collapsed without increasing the residence time in the process as much as possible.
[0020]
In the present invention, the process information storage means may further store an inter-process lead time, which is a lead time between the processes, for each product type. At this time, the load stacking unit may assign a unit load amount to each segment within the work allocatable period based on the inter-process lead time stored in the process information storage unit (claims 5, 18, 31).
[0021]
As a result, the load amount can be piled up in consideration of the inter-process lead time, so that it is possible to perform load adjustment more realistically.
[0022]
In the present invention, the apparatus may further comprise an inter-process lead time setting means for calculating the inter-process lead time. At this time, the inter-process lead time setting means calculates, for each of the processes, a process load index which is an index for determining the degree of load of the process within the planning period, by: process load index = total of load amount in process / planning period , Calculated as the sum of the work capacities in the relevant process, and the inter-process lead time is calculated as the inter-process lead time = the moving time between the preceding and succeeding processes + the spare time in the subsequent process. The margin time may be set longer as the process load index increases (claims 6, 19, 32).
[0023]
According to this configuration, the magnitude of the load amount for each process within the planning period is quantified by the process load index. On the other hand, the inter-process lead time is set based on the moving time of the preceding and succeeding processes and the margin time in the post-process. At this time, the margin time in the post-process is set longer as the process load index is larger. As a result, in a process with insufficient capacity, the time from the arrival of the process to the start of the process becomes longer. In other words, the process has a large amount of in-process inventory in a process with no capacity, and does not have the in-process inventory in a process with a capacity. For this reason, it is possible to prevent an opportunity loss in a neck process due to an operation trouble in an upper process or a delay in progress without increasing the entire construction period from the start to the completion of production.
[0024]
In the present invention, in the load landslide, when the load amount registered in the work allocation table is moved to another segment, when moving in the forward direction, the lead time with the immediately preceding process, The apparatus may further comprise an inter-process lead time determining means for calculating a lead time with the immediately succeeding step when moving backward, and determining whether or not the inter-process lead time is secured. At this time, if the inter-process lead time determining means determines that the inter-process lead time is not ensured, the load in the immediately preceding process is moved forward if the head is moved forward. In the case where the load is moved in the backward direction, it is preferable to move the load amount in the immediately succeeding step to the subsequent step (claims 7, 20, 33).
[0025]
According to this configuration, when the lead time from the preceding and following processes cannot be secured as a result of the load crushing in a certain process, the work time zone in the preceding and following processes is corrected. This makes it possible to create a plan in which the lead time between processes is secured.
[0026]
Further, when it is determined that the inter-process lead time is not ensured, when moving the load amount in the forward or backward direction, a load amount with a smaller number of segments to be moved may be prioritized. 8, 21, 34).
[0027]
According to this configuration, when performing a load crush in a certain process, the unit work can be moved so that the influence on the preceding and following processes is minimized.
[0028]
Also, in the load crushing, when moving the load amount registered in the work assignment table, priority is given to a segment in which the ratio of the load amount to the work capacity after the movement of the load amount is reduced. It is preferable to move the load amount by using (claims 9, 22, 35).
[0029]
According to this configuration, when performing a load crush in a certain process, a segment having a margin for the process capability is preferentially selected as a destination of the load amount. Thereby, load leveling can be performed efficiently.
[0030]
In addition, the process load adjusting apparatus of the present invention includes a processing priority setting unit for setting a processing priority of a product for each segment, and selecting one product based on the processing priority for any one segment. And a load consolidating means for performing load consolidation for moving at least a part of the load amount registered in the work allocation table for the selected product to the segment, and the load consolidation based on the processing priority. Means for selecting a product other than the product selected by the means, and performing load spreading for moving at least a part of the load amount registered in the work allocation table from the segment to another segment for the selected product. The load spreading means, and when the segment is the N-th segment, the load is spread across the (N-1) -th segment and the N-th segment; When the condition that the number of products whose quantity is registered is 1 or less and the number of products whose load is registered across the Nth segment and the (N + 1) th segment is 1 or less is satisfied, The apparatus may further include an in-segment end condition determining means for determining the end of the movement of the load by the aggregation means and the load spreading means (claim 10).
[0031]
The process load adjusting method according to the present invention includes a processing priority setting step of setting a processing priority of a product for each segment, selecting one product based on the processing priority for any one segment, and selecting the product. A load consolidating step of performing load consolidation for moving at least a part of the load amount registered in the work allocation table to the segment for the selected product; and a product selected by the load consolidating means based on the processing priority. Selecting a product other than the load spreading step of performing load spreading for moving at least a part of the load amount registered in the work allocation table from the segment to another segment for the selected product; and When the N-th segment is set, the load amount is registered across the (N-1) -th segment and the N-th segment. At the time when the condition that the number of products registered is 1 or less and the number of products whose load amount is registered across the Nth segment and the (N + 1) th segment is 1 or less is satisfied, An in-segment end condition determining step of determining the end of the movement of the load amount by the load spreading step may be further provided.
[0032]
A program according to a thirty-sixth aspect of the present invention is a program for causing a computer to function as the process load adjusting device according to the tenth aspect.
[0033]
According to these configurations, the load amount is readjusted within the range of the degree of freedom of the work allocation set based on the long-term plan obtained as a result of the load collapse. As a result, a processing product for each segment in each process is determined. This makes it possible to create a schedule that is consistent with the long-term plan.
[0034]
In the present invention, in the load spreading, the sum of the load amounts of all the products related to the arbitrary one segment registered in the work assignment table before the load aggregation is performed and the load amount is calculated from the segment. It is preferable to determine the amount of load to be moved so that the sum of the amount of load pertaining to the segment after moving to the segment is equal to the sum of all products (claims 11, 24, 37).
[0035]
According to this configuration, readjustment of the load amount is performed while maintaining the total load amount after the collapse of the load. Therefore, it is possible to prevent the load from being overloaded as a result of the readjustment of the load amount.
[0036]
In the present invention, the processing priority is set higher for a product in which the number of registered segments is smaller among products whose load amounts are registered across a plurality of segments including the arbitrary one segment. Good (claims 12, 25, 38).
[0037]
According to this configuration, priority is given to the processing of a product for which the work is allocated for a short period. Therefore, it becomes easy to make a schedule within the work allocatable period set in the long-term plan.
[0038]
In the present invention, the processing priority may be set higher for a product with a shorter setup change time among products whose load amount is registered over a plurality of segments including the arbitrary one segment (claims). Items 13, 26, 39).
[0039]
According to this configuration, it is easy to select products in the order in which the setup change time is small. Therefore, it becomes easy to create a practical schedule plan.
[0040]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
[0041]
[Description of process load adjusting device]
First, a process load adjusting device according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram of a process load adjusting device.
[0042]
As shown in FIG. 1, the process load adjusting device 1 includes a hard disk 10, a memory 20, and a CPU 30.
[0043]
The hard disk 10 stores process information 11, product information 12, and load adjustment results 13.
[0044]
The process information 11 stores the process information on the passing process for each type in the present embodiment. The process information 11 transfers the process information to a process information memory (process information storage unit) 21 described later.
[0045]
The product information 12 stores product information to be planned in the present embodiment. The product information 12 transfers product information to a product information memory (product information storage unit) 22 described later.
[0046]
The load adjustment result 13 stores a load adjustment result input from a load adjustment result output interface 35 described later.
[0047]
The memory 20 includes a process information memory 21, a product information memory 22, and a work assignment table 23.
[0048]
The process information memory 21 temporarily stores the process information transferred from the process information 11 described above. The process information memory 21 performs data input / output between inter-process lead time setting units (inter-process lead time setting means) 31 or between unit load amount calculating units 32 described later. The process information memory 21 outputs process information to a load stacking unit (load stacking unit) 33 described later. Further, the process information memory 21 outputs the inter-process lead time to an inter-process lead time determining unit (inter-process lead time determining means) 34a described later.
[0049]
The product information memory 22 temporarily stores the product information transferred from the product information 12 described above. The product information memory 22 outputs process information to a load stacking unit 33 described later.
[0050]
In the work assignment table 23, the facility capacity and the load amount are registered for each segment for each process.
[0051]
The CPU 30 includes an inter-process lead time setting unit 31, a unit load amount calculating unit 32, a load stacking unit 33, a load crushing unit (load crushing means) 34, and a load adjustment result output interface 35. ing.
[0052]
First, the inter-process lead time setting unit 31 determines, based on the process information stored in the process information memory 21 described above, that the total amount of the process load required to produce a product corresponds to the process capability within the planning period. The process load index is calculated as a criterion for determining the ratio. The process load index is calculated as follows.
Process load index = total load of the process / process capability within the planning period
[0053]
Here, the total load of the process for each process is a value obtained by multiplying the product type × process load indicated in the process information by the number of product types indicated in the product information. Then, a certain margin period (inter-process lead time) is provided for the neck process having the largest calculated process load index in order to prevent the opportunity loss due to lack of material from the operation fluctuation in the previous process.
[0054]
Here, the inter-process lead time is set as follows.
Inter-process lead time = travel time of preceding and following processes + extra time in post-process
[0055]
The inter-process lead time setting section 31 outputs the set inter-process lead time to the process information memory 21.
[0056]
The unit load amount calculation unit 32 calculates a unit load amount of each work. That is, in the unit load amount calculation unit 32, first, based on the process information stored in the process information memory 21 described above, the load amount corresponding to the unit work for each type × process registered in the process information, and the work allocation Based on the possible period, a unit load, which is the load per segment of each work, is calculated. Here, the unit load of each work is calculated as follows.
Unit load = Process load / Number of segments that can be allocated
[0057]
The unit load amount calculation unit 32 outputs the calculated unit load amount to the process information memory 21.
[0058]
The load stacking unit 33 performs processing on all products based on the process information input from the process information memory 21, the product information input from the product information memory 22, and the work allocation table input from the work allocation table 23. , Pile up the load of each work. The load stacking unit 33 outputs the result of the load stacking to the work assignment table 23.
[0059]
After the load pile-up unit 34 performs the load pile-up by the load pile-up unit 33, the load pile-up unit 34 reduces the unit load amount until the load of all the segments in the work allocation table input from the work allocation table 23 becomes equal to or less than the registered process capability. Load crushing is performed as a unit. The load crusher 34 outputs the result of load crushing to the work assignment table 23.
[0060]
In addition, the load crushing unit 34 has an inter-process lead time determination unit (inter-process lead time determination unit) 34a. The inter-process lead time determination unit 34a calculates the inter-process lead time before and after the load crushing, and determines whether the inter-process lead time stored in the process information memory 21 is secured.
[0061]
The processing priority setting unit 35 determines the processing priority of the product for each segment in the work assignment table 23 on which the load crushing has been performed by the load crushing unit 34. Here, the processing priority may be set so that, of the products assigned to the segment, the shorter the work assignment period, the higher the priority, but among the products assigned to the segment, It is desirable that the shorter the allocation period, the higher the priority, and the shorter the setup time, the higher the priority. The processing priority setting unit 35 outputs the set processing priority of the product to a load aggregating unit 36 and a load spreading unit 37 described later.
[0062]
The load aggregating unit 36 selects a product based on the processing priority of the product set by the processing priority setting unit 35 for the work assignment table 23 whose processing priority is determined by the processing priority setting unit 35, Consolidate the load of the product into the segment. Then, the load aggregating unit 36 outputs the result of the aggregation of the loads to the work assignment table 23.
[0063]
The load spreading unit 37 is selected by the load aggregating unit 36 based on the processing priority of the product set by the processing priority setting unit 35 with respect to the work assignment table 23 in which the loads are aggregated by the load aggregating unit 36. Select a product other than the product and spread the load of that product from this segment to other segments. Here, the amount of the load spread to other segments is determined by the total load amount of the segment unit of the work allocation table 23 obtained by the load crushing by the load crushing unit 34 and the total load amount of the segment unit after the load spreading. Determined to be equal. Then, the load spreading unit 37 outputs the result of spreading the load to the work table 23.
[0064]
The intra-segment end condition determination unit 38 determines the end of the load aggregation by the load aggregation unit 36 and the end of the load diffusion by the load diffusion unit 37 in the segment. Here, when the segment is determined to be N segments (Nth segment), the number of products whose work allocation period spans N-1 segment and N segment is 1 or less, and N segment and N + 1 This is performed when the condition that the number of products over the segment is one or less is satisfied.
[0065]
After the load adjustment is performed, the load adjustment result output interface 39 outputs the work assignment table input from the work assignment table 23 to the load adjustment result storage unit 13 and outputs the work assignment table to the printer 40, the monitor 41, and the like. I do.
[0066]
[Explanation of long-term plan creation process flow]
Next, a processing flow of a long-term plan created by the process load adjusting method according to the present embodiment, that is, a processing method of performing load adjustment on the process capability set for each segment will be described with reference to FIG.
[0067]
First, product information and process information are transferred from a higher-level production management system (product information 12 and process information 11), and are read into a program (step S1). The read information is stored in the product information memory 22 and the process information memory 21 on the memory, respectively.
[0068]
Here, as shown in FIG. 3, the process information on the passing process for each product type in the present embodiment includes the passing process sequence, the load per product (processing time) in each process, and the Is registered. The unit load amount shown in FIG. 3 is added later by the unit load amount calculating unit (unit load calculating means) 32 in step S2 described later. As shown in FIG. 4, the passing process sequence is such that the raw material supplied to the process 1 is processed in each process from the process 2 to the process 5 according to the route indicated by the arrow, and then is shipped as a final product. I do. In step 2, there are some types that pass and some types that do not pass.
[0069]
The work allocatable period is indicated by the number of segments. In this embodiment, as shown in FIG. 4, one segment is set to 8 hours. Therefore, in the process 4 of the type B, an allocatable period of 8 × 2 = 16 hours is set.
[0070]
Here, the work allocatable period in the process 4 differs depending on the type. That is, the type A is the longest, and the type C is the shortest. This is because the setup change condition in step 4 is set as follows.
Cases that do not require setup change: Type A → Type A, Type B → Type B, Type C → Type B, Type A → Type C, Type B → Type C, Type C → Type C
Cases where setup change is required: Type B → Type A, Type C → Type A, Type A → Type B
[0071]
That is, it is shown that the type A has limited processing timing for eliminating the setup change, and the type C does not require the setup change regardless of the type immediately before. Therefore, by setting the work assignable period long for the type A, the possibility of determining an appropriate processing timing when creating an execution system (schedule plan) schedule is increased.
[0072]
As shown in FIG. 5, the product information to be planned in the present embodiment includes three types of A, B, and C, four types of product A, eight products of product B, and 16 products of product C. It is necessary to manufacture individually.
[0073]
Next, the unit load amount calculation unit 32 calculates the unit load amount, which is the load amount per segment of each unit work, based on the type × the load amount for each process registered in the process information and the work allocatable period. Calculation is performed (step S2). The rightmost column of the process information in FIG. 3 shows the unit load in each process in the present embodiment.
[0074]
The inter-process lead time setting section 31 sets an inter-process lead time based on the process load index (step S3).
In the present embodiment, the plan period is set to 3 days, and FIG. 6 shows a calculation result of the process load index in the present embodiment.
[0075]
As shown in FIG. 6, the process capability of each process within the plan period is 36 hours only in process 5 in which operation is stopped during night shift, and 54 hours in other processes. On the other hand, the total load of the process for each process is a value obtained by multiplying the product type × process load shown in the process information (see FIG. 3) by the number of product types shown in the product information (see FIG. 5). It becomes.
Looking at the calculated process load index, it can be seen that the index of the process 3 is the largest and is the bottleneck process. Therefore, in the step 3, a certain allowance period is provided in order to prevent an opportunity loss due to a shortage of materials due to an operation fluctuation in the previous step. In the present embodiment, a margin time of two segments (16 hours) is provided.
[0076]
Here, in the present embodiment, the inter-process lead time is set as follows, assuming that the movement time between the processes can be ignored.
Lead time between processes = extra time in post process
[0077]
FIG. 7 shows the relationship among the work allocatable period, the unit load amount allocated to each segment within the work allocatable period, and the inter-process lead time in this embodiment.
[0078]
Then, the work assignment table 23 is initialized (step S4).
In the present embodiment, as shown in FIG. 8, the work assignment table 23 sets the operating time in each segment as the facility capacity. In the present embodiment, 6 hours per segment (8 hours) are set in almost all steps, but only the step 5 is set to a time zone during which the equipment does not operate (night shift).
[0079]
In the initialization, an initial value of the load is set. In the present embodiment, as shown in FIG. 8, the initial values of all the load amounts are set to 0. However, if there is a work whose processing is determined in advance, the load corresponding to the work is registered.
[0080]
Then, using the quantities stored in the process information memory 21 and the product information memory 22, the load stacking unit 33 performs load stacking for all products for each process (step S5). More specifically, the unit load amount assigned to each segment within the work allocatable period is added for each process for all types in consideration of the production quantity of the type. The result is registered in the work assignment table 23. In the present embodiment, it is assumed that production of all products has started from the start of scheduling (September 1), and the load is piled up. FIG. 9A shows the state of the work assignment table immediately after all the works have been loaded.
[0081]
Next, an end condition of the load landslide is determined (step S6). If the load crushing end condition is satisfied, that is, if the load amounts of all segments in the work assignment table 23 are equal to or less than the registered process capability (step S6: YES), the subsequent load crushing is not performed. The process ends.
[0082]
On the other hand, if the load crushing end condition is not satisfied, that is, if the load amounts of all the segments in the work assignment table 23 are not less than the registered process capability (step S6: NO), the load crushing unit 34 Subsequent load crushing (steps S7 to S10) is performed.
[0083]
In the load erosion, first, a landslide target segment is selected (step S7). In the present embodiment, among the segments stored in the work assignment table 23, the segment with the largest load is selected as a landslide target. In FIG. 9A, since the load of the fifth segment in the step 3 is the largest, this is selected as a landslide target.
[0084]
Then, in the landslide target segment selected in step S7, selection of a moving operation and determination of a destination segment are performed (step S8). In the present embodiment, type A (4 unit work) and type C (16 unit work) are assigned to the segment selected in step S7 (the fifth segment in step 3).
[0085]
First, a unit work to be moved to another segment for load crushing is selected from among them. Here, one unit work was selected from the type C. As a criterion for selecting a unit operation, for example, a margin for a delivery date can be considered. Assuming that the delivery date of all the products is September 5, the type C that has the most margin for the delivery date at this time is selected.
[0086]
Next, a destination segment to which one unit operation of the selected type C is moved is determined. In this embodiment, since all the products are piled up from the start of the scheduling, the movable direction of the work at this time is the backward direction (future direction). Therefore, the destination segment is set as a sixth segment. FIG. 10A shows the unit work of the type C corresponding to FIG. 9A.
[0087]
Then, based on the moving work selected in step S8 and the determined destination segment, the unit work is moved using the unit load amount as a unit (step S9). In the present embodiment, one unit work of the type C in the fifth segment of the process 3 selected in step S8 is moved one segment later (the sixth segment of the process 3) using the unit load as a unit. As a result of this movement, the inter-process lead time determination unit 34a determines that it is not possible to secure the lead time with the next process, step 4, so that one unit work of the sixth segment of the type 4 process 4 is reduced to the unit load amount. It is moved one unit later (the seventh segment in step 4) as a unit. Similarly, in order to secure the lead time of the step 5, one unit work of the seventh segment of the step 5 of the type C is also moved one segment later (the eighth segment of the step 5) using the unit load as a unit.
[0088]
Then, the amount of change in the load associated with the work movement in step S8 is calculated, and the value in the work assignment table 23 is changed (step S10). In the present embodiment, the state of the work assignment table after the movement is shown in FIG. FIG. 10B shows the movement of the unit work of the type C corresponding to FIG. 9B.
[0089]
When the load crushing in steps S7 to S10 is completed, the process returns to step S6, and the condition for confirming the completion of the load crushing is determined again (whether the loads of all the segments in the work assignment table 23 are equal to or less than the registered process capability). I do. If it is determined that the condition for confirming the end of the load crushing is not satisfied (step S6: NO), the above-described steps S7 to S10 are repeated to successively perform the load crushing.
[0090]
In this embodiment, FIGS. 9C to 9H show changes in the load amount of the work assignment table following the load crushing after this. FIGS. 10 (c) to 10 (h) show how the unit work of type C corresponding to FIGS. 9 (c) to 9 (h) moves. In FIGS. 10 (f) and 10 (h) corresponding to FIGS. 9 (f) and 9 (h), only the unit work of the process 2 of the type C is moved, and the work movement in the lower process occurs. I haven't. This is because, in FIGS. 10 (a) to 10 (c) corresponding to FIGS. 9 (a) to 9 (c), the movement of steps 3 to 5 has already occurred.
[0091]
In the above embodiment, the landslide direction in the load landslide in steps S7 to S10 is only the backward direction (future direction). Here, a case where the direction of the landslide of the load landslide is the forward direction (past direction) is described as an example of another embodiment different from the above-described embodiment. However, the product information and the process information are the same as in the above-described embodiment.
[0092]
FIG. 11 shows a state in the middle of load crushing in step 4 according to another embodiment. Note that A1, B1, C1 and the like in FIG. 11 indicate the first products of the types A, B, and C. Also, s, s + 1, etc. in FIG. 11 represent segments.
[0093]
First, as shown in FIG. 11A, the load sloping of the segment s + 4 having the maximum total load is performed. For a product such as A1 or A2, which has a landslide target segment in the middle of the work allocation period, the work allocation period after the unit work is moved becomes shorter, so the work of the product whose segment is at the end of the work allocation period Is moved with priority. Here, for example, B1 is selected. Although s + 2 and s + 5 can be considered as the destinations of the unit work of the s + 4 segment of the product B1, the total load (5.5) of s + 2 is smaller than the total load (8) of s + 5, so that s + 2 is earlier. Move.
[0094]
Next, as shown in FIG. 11B, the load sloping of the segment s + 5 having the maximum total load is performed. For example, A1 is selected as a product whose s + 5 corresponds to the end of the work allocatable period. Although s + 1 and s + 6 can be considered as destinations of the unit work of the s + 5 segment of the product A1, the total load (5) of s + 1 is smaller than the total load (5.5) of s + 6, so Move.
[0095]
Then, in the same manner as described above, as shown in FIG. 11C, the landslide of the segment s + 4 having the maximum total load is performed. For example, A1 is selected as a product whose s + 4 corresponds to the end of the work allocatable period. Although s and s + 5 can be considered as the destinations of the unit operation of the s + 4 segment of the product A1, since the total load of s (5) is smaller than the total load of s + 5 (7.5), it moves forward to s. Let it.
[0096]
Further, as shown in FIG. 11D, load crushing of the segment s + 5 having the maximum total load is performed. For example, C2 is selected as a product whose s + 5 corresponds to the end of the work allocatable period. Although s + 4 and s + 6 can be considered as destinations of the unit operation of the s + 5 segment of the product C2, the total load of s + 6 (5.5) is smaller than the total load of s + 4 (7.5). Move back to.
FIG. 11E shows the result of the load crushing performed as described above.
[0097]
In this way, the load can be crushed by combining the movements in the front-rear direction.
[0098]
[Explanation of the process flow for creating a schedule]
Next, a processing flow of a schedule created by the process load adjusting method according to the present embodiment, that is, a processing method of creating a schedule based on the long-term plan created as described above will be described with reference to FIG. explain. FIGS. 13 and 14 show another embodiment different from the embodiment used in the above-described long-term plan processing flow. 5 shows an example of a work assignment table in a process. Here, loads of nine products from product a to product i are allocated between segment 1 to segment 6. Further, each product is either type 1 or type 2, and when processing is performed continuously, setup change occurs when the type is different. In this embodiment, one segment is one day, and the unit of the load is day. The maximum load of each segment is set to one day. Hereinafter, a processing flow of a schedule plan created by the process load adjustment method according to the present embodiment will be described with reference to FIGS.
[0099]
In the processing flow of the long-term plan described above, the work assignment table 23 obtained by the load crushing unit 34 is read (step S101). The read work assignment table 23 is as shown in FIG.
[0100]
・ Readjust the load of segment 1 (first time)
First, the load of the segment S is readjusted (step S102). In the present embodiment, readjustment (first time) of the load of the segment S = 1 is performed. In readjusting the load on the segment S, first, the processing priority setting unit 35 determines the processing priority of the products assigned to the segment S (step S103). In the present embodiment, of the products assigned to the segment 1, the shorter the work allocatable period and the shorter the setup change time, the higher the processing priority of the product is determined.
[0101]
Next, the load aggregating unit 36 determines one segment for which the load is aggregated in the segment S (step S104). In the present embodiment, as shown in FIG. 13A, of the products allocated to the segment 1, the work allocatable period is short and the setup change time is short (there is no relation since the previous segment does not exist). The product b is prioritized as the load aggregation target product. Then, for the products selected in step S104, the load on the segment S is consolidated (step S105). In the present embodiment, since the load amount of 0.2 is assigned to the segment 2 for the product b, it is collected into the segment 1.
[0102]
On the other hand, the load spreading unit 37 selects one product whose load is to be moved from the segment S (step S106). In the present embodiment, since the product b selected in step S104 is of type 1, among the products assigned to the segment 1, the product a that is different in type from the product b and has a long load assignment period is assigned to the load spreading target product. Select as Then, the load is moved from the segment S for the product selected in step S106 (step S107). In this embodiment, since the load of the product a is assigned to the segment 1 of 0.1, the load is added to the segment 2.
[0103]
Then, the in-segment end condition determining unit 38 checks whether the total load of each segment matches the work assignment table 23 obtained by the load crushing unit 34 (step S108). In this embodiment, since the total load of segment 1 at this point is 1.1 and the total load of segment 2 is 0.9, the total load of each segment was obtained by the load crusher 34. It does not match the work assignment table 23 (see FIG. 13A) (step S108: NO).
[0104]
Therefore, returning to step S106, the load spreading unit 37 further selects one product whose load is to be moved from the segment S (step S106). In the present embodiment, a product c whose type is different from b is selected as a load spreading target product. Then, the load is moved from the segment S for the product selected in step S106 (step S107). In the present embodiment, the load of the product c is assigned to the segment 1 by 0.3, but the load to be adjusted is 0.1. Add to 2.
[0105]
Then, the in-segment end condition determining unit 38 checks whether the total load of each segment matches the work assignment table 23 obtained by the load crushing unit 34 (step S108). In this embodiment, at this time, the total load of the segment 2 becomes 1 which is the same as the work assignment table 23 (see FIG. 13A) obtained by the load crushing unit 34. Also, the total load of the segment 1 becomes 1 which is the same as the work allocation table 23 (see FIG. 13A) obtained by the load crushing unit 34 (step S108: YES). FIG. 13B shows the work assignment table 23 as a result of the readjustment (first time) of the load of the segment 1.
[0106]
When it is determined in step S108 that the total load of each segment matches the work allocation table 23 obtained by the load crushing unit 34 (step S108: YES), whether to end the adjustment of the segment S is determined. Is checked (step S109). Here, the condition for ending the adjustment of the segment S is that the number of products whose work allocation period spans the segments S-1 and S is 1 or less, and the number of products whose work allocation period spans the segment S and the segment S + 1 is 1 or less. That is.
[0107]
In the present embodiment, as shown in FIG. 13B, when the readjustment (first time) of the load of the segment 1 is completed, the products whose work allocation period spans the segments 1 and 2 are c and d. , E (step S109: NO), the load readjustment (second time) of the segment 1 is further performed (steps S104 to S108).
[0108]
・ Readjustment of segment 1 load (second time)
First, the load aggregating unit 36 determines one product whose load is aggregated in the segment S (step S104). In the present embodiment, d and e, which are the same type as the product b whose setup change time is shorter than the product b that has already been aggregated (c, d, e), are prioritized as load aggregation targets. However, since d and e are the three segments having the same work assignment period, the processing priorities are the same. Here, d is selected.
[0109]
Then, for the product selected in step S104, the load is consolidated into the segment S (step S105). In this embodiment, since the load of the product d is assigned to the segment 2 of 0.1 and the load of the segment 3 to 0.1, these are aggregated into the segment 1.
[0110]
Next, the load spreading unit 37 selects one product whose load is to be moved from the segment S (step S106). In the present embodiment, since the product d selected in step S104 is type 1, a product c of a different type is selected as a load spreading target product.
[0111]
Then, for the product selected in step S106, the load is moved from the segment S (step S107). In the present embodiment, since the product c has a load of 0.2 assigned to the segment 1, the load is added to the segment 2 by 0.1 and to the segment 3 by 0.1.
[0112]
Then, the intra-segment end condition determining unit 38 checks whether the total load of each segment matches the work allocation table 23 obtained by the load crushing unit 34 (step S108). In this embodiment, at this time, the total load of the segment 1 becomes 1 which is the same as the work assignment table 23 (see FIG. 13A) obtained by the load crusher 34. In addition, the total load of the segments 2 and 3 also becomes 1, which is the same as the work allocation table 23 (see FIG. 13A) obtained by the load crusher 34. FIG. 13C shows the work assignment table 23 as a result of the readjustment (second time) of the load of the segment 1.
[0113]
When it is determined in step S108 that the total load of each segment matches the work allocation table 23 obtained by the load crushing unit 34 (step S108: YES), whether to end the adjustment of the segment S is determined. Is checked (step S109). In this embodiment, as shown in FIG. 13C, when the readjustment (second time) of the load of the segment 1 is completed, the product whose work assignment period spans the segments 1 and 2 is the product e. Since there is only one, the load readjustment of the segment 1 ends (segment S109: YES).
[0114]
When it is determined that the adjustment of the segment S is to be ended (segment S109: YES), S = S + 1 is set (step S110). Then, it is checked whether or not the entire adjustment is completed (step S111). Here, the condition for terminating the entire adjustment is that there is no segment S = S + 1 for adjusting the load next. In the present embodiment, since the condition for terminating the entire adjustment is not satisfied (step S111: NO), the process returns to step S103 and the segment S is readjusted.
[0115]
・ Readjustment of segment 2 load
In readjusting the load of the segment S, first, the processing priority setting unit 35 determines the processing priority of the products allocated to the segment S (step S103). In the present embodiment, among the products allocated to the segment 2, the shorter the work allocatable period and the shorter the setup change time, the higher the processing priority of the product is determined.
[0116]
Next, the load aggregating unit 36 determines one segment for which the load is aggregated in the segment S (step S104). In the present embodiment, as shown in FIG. 13 (c), among the products assigned to the segment 2, the product e having a short work assignable period and a short setup time is prioritized as a load aggregation target product. . Then, for the products selected in step S104, the load on the segment S is consolidated (step S105). In the present embodiment, since the load of 0.2 is assigned to the segment 3 for the product e, this is collected into the segment 2.
[0117]
On the other hand, the load spreading unit 37 selects one product whose load is to be moved from the segment S (step S106). In the present embodiment, since the product e selected in step S104 is of type 1, among the products a and c having different types from the product e among the products allocated to the segment 2, the products having a longer load allocation period a is selected as a load spreading target product. Then, the load is moved from the segment S for the product selected in step S106 (step S107). In the present embodiment, since a load of 0.2 is assigned to the segment 2 for the product a, this is added to the segment 3.
[0118]
Then, the in-segment end condition determining unit 38 checks whether the total load of each segment matches the work assignment table 23 obtained by the load crushing unit 34 (step S108). In this embodiment, since the total load of the segment 2 at this time is 1.1, the total load of each segment is calculated by the work assignment table 23 obtained by the load crushing unit 34 (see FIG. 13A). Does not match (step S108: NO).
[0119]
Therefore, the load spreading unit 37 returns to step S106, and further selects one product whose load is to be moved from the segment S (step S106). In the present embodiment, a product c whose type is different from e is selected as a load spreading target product. Then, the load is moved from the segment S for the product selected in step S106 (step S107). In the present embodiment, the load of the product c is assigned to the segment 2 with a load of 0.5, but the load to be adjusted is 0.1. Add to 3.
[0120]
Then, the in-segment end condition determining unit 38 checks whether the total load of each segment matches the work assignment table 23 obtained by the load crushing unit 34 (step S108). In this embodiment, at this time, the total load of the segment 3 is 1 which is the same as the work allocation table 23 (see FIG. 13A) obtained by the load crusher 34. In addition, the total load of the segment 2 also becomes 1 which is the same as the work assignment table 23 (see FIG. 13A) obtained by the load crusher 34 (step S108: YES). FIG. 13D shows the work assignment table 23 as a result of the readjustment of the load of the segment 2.
[0121]
When it is determined in step S108 that the total load of each segment matches the work allocation table 23 obtained by the load crushing unit 34 (step S108: YES), whether to end the adjustment of the segment S is determined. Is checked (step S109).
[0122]
In the present embodiment, as shown in FIG. 13 (d), when the readjustment of the load on the segment 2 is completed, only one product e has a work allocation period spanning the segments 1 and 2. Yes, and only one of the products c has a work allocation period spanning the segments 2 and 3, so that the load readjustment of the segment 2 ends (segment S109: YES).
[0123]
When it is determined that the adjustment of the segment S is to be ended (segment S109: YES), S = S + 1 is set (step S110). Then, it is checked whether or not the entire adjustment is completed (step S111). Here, the condition for terminating the overall adjustment is that, in all the segments, the number of products whose work allocation period spans the preceding and succeeding segments is 1 or less. In the present embodiment, since the condition for terminating the entire adjustment is not satisfied (step S111: NO), the process returns to step S103 and the segment S is readjusted.
[0124]
・ Segment 3 load adjustment
In readjusting the load of the segment S, first, the processing priority setting unit 35 determines the processing priority of the products allocated to the segment S (step S103). In the present embodiment, of the products assigned to the segment 3, the shorter the work allocatable period and the shorter the setup change time, the higher the processing priority of the product is determined. Here, the product c has no load amount to be aggregated after the segment 4 and is therefore excluded from the load amount aggregation target. That is, the product c determines the processing in the segment 4.
[0125]
Next, the load aggregating unit 36 determines one segment for which the load is aggregated in the segment S (step S104). In the present embodiment, as shown in FIG. 13D, of the products a and f assigned to the segment 3, the product a having a short work assignable period and a short setup change time is regarded as a load aggregation target product. have priority. Then, for the products selected in step S104, the load on the segment S is consolidated (step S105). In the present embodiment, since the load amount of 0.1 is assigned to the segment 4 for the product a, this is collected into the segment 3.
[0126]
On the other hand, the load spreading unit 37 selects one product whose load is to be moved from the segment S (step S106). In the present embodiment, the remaining product f is selected as a load spreading target product. Then, the load is moved from the segment S for the product selected in step S106 (step S107). In the present embodiment, although the load of the product f is 0.2 assigned to the segment 3, the load amount to be adjusted is 0.1. Add to 4.
[0127]
Then, the in-segment end condition determining unit 38 checks whether the total load of each segment matches the work assignment table 23 obtained by the load crushing unit 34 (step S108). In this embodiment, at this time, the total load of the segment 4 also becomes 0.9, which is the same as the work allocation table 23 (see FIG. 13A) obtained by the load crushing unit 34 (step S108: YES). . FIG. 14A shows the work assignment table 23 as a result of the readjustment of the load of the segment 2.
[0128]
When it is determined in step S108 that the total load of each segment matches the work allocation table 23 obtained by the load crushing unit 34 (step S108: YES), whether to end the adjustment of the segment S is determined. Is checked (step S109). In the present embodiment, as shown in FIG. 14 (a), when the readjustment of the load on the segment 2 is completed, only one product c has a work allocation period spanning the segments 2 and 3. Yes, and only one product f has a work allocation period spanning segment 3 and segment 4, so the load readjustment of segment 3 ends (segment S109: YES).
[0129]
When it is determined that the adjustment of the segment S is to be ended (segment S109: YES), S = S + 1 is set (step S110). Then, it is checked whether or not the entire adjustment is completed (step S111). In the present embodiment, since the condition for terminating the entire adjustment is not satisfied (step S111: NO), the process returns to step S103 and the segment S is readjusted.
[0130]
・ Readjustment of the load of segment 4 (first time)
In readjusting the load of the segment S, first, the processing priority setting unit 35 determines the processing priority of the products allocated to the segment S (step S103). In the present embodiment, among the products allocated to the segment 4, it is determined that the shorter the work allocatable period and the shorter the setup change time, the higher the processing priority of the product.
[0131]
Next, the load aggregating unit 36 determines one segment for which the load is aggregated in the segment S (step S104). In the present embodiment, as shown in FIG. 14A, among the products allocated to the segment 4, the product f having a short work assignable period and a short setup time is prioritized as a load aggregation target product. . Then, for the products selected in step S104, the load on the segment S is consolidated (step S105). In the present embodiment, since the product f has a load of 0.2 assigned to the segment 5, the load is collected into the segment 4.
[0132]
On the other hand, the load spreading unit 37 selects one product whose load is to be moved from the segment S (step S106). In the present embodiment, of the remaining products g and h allocated to the segment 4, the product g having a long load allocation period is selected as the load spreading target product. Then, the load is moved from the segment S for the product selected in step S106 (step S107). In the present embodiment, the load of the product g is 0.4 assigned to the segment 4, but the load to be adjusted is 0.2. Add to 5.
[0133]
Then, the in-segment end condition determining unit 38 checks whether the total load of each segment matches the work assignment table 23 obtained by the load crushing unit 34 (step S108). In this embodiment, at this time, the total load of the segment 5 becomes 1 which is the same as the work assignment table 23 (see FIG. 13A) obtained by the load crushing unit 34. Also, the total load of the segment 4 is 0.9, which is the same as the work allocation table 23 (see FIG. 13A) obtained by the load crushing unit 34 (step S108: YES). FIG. 14B shows the work assignment table 23 as a result of the readjustment (first time) of the load of the segment 4.
[0134]
When it is determined in step S108 that the total load of each segment matches the work allocation table 23 obtained by the load crushing unit 34 (step S108: YES), whether to end the adjustment of the segment S is determined. Is checked (step S109). In the present embodiment, as shown in FIG. 14B, when the readjustment (first time) of the load on the segment 4 is completed, the products whose work allocation period spans the segments 4 and 5 are g and h. (Step S109: NO), the load re-adjustment (second time) of the segment 4 is further performed (steps S104 to S108).
[0135]
・ Readjustment of load of segment 4 (second time)
First, the load aggregating unit 36 determines one product whose load is aggregated in the segment S (step S104). In the present embodiment, a product h having a short work assignment period other than the product f already aggregated (g, h) has a high processing priority and is selected as a load aggregation target product. Then, for the product selected in step S104, the load is consolidated into the segment S (step S105). In the present embodiment, since the load of the product h is 0.2 assigned to the segment 5, the load is collected into the segment 4.
[0136]
Next, the load spreading unit 37 selects one product whose load is to be moved from the segment S (step S106). In the present embodiment, the remaining product g is selected as a load spreading target product. Then, for the product selected in step S106, the load is moved from the segment S (step S107). In the present embodiment, since a load of 0.2 is assigned to the segment 4 for the product g, this is added to the segment 5.
[0137]
Then, the in-segment end condition determining unit 38 checks whether the total load of each segment matches the work assignment table 23 obtained by the load crushing unit 34 (step S108). In this embodiment, at this time, the total load of the segment 5 becomes 1 which is the same as the work assignment table 23 (see FIG. 13A) obtained by the load crushing unit 34. Also, the total load of the segment 4 is 0.9, which is the same as the work allocation table 23 (see FIG. 13A) obtained by the load crusher 34. FIG. 14C shows the work assignment table 23 as a result of the readjustment (second time) of the load of the segment 4.
[0138]
When it is determined in step S108 that the total load of each segment matches the work allocation table 23 obtained by the load crushing unit 34 (step S108: YES), whether to end the adjustment of the segment S is determined. Is checked (step S109).
[0139]
In the present embodiment, as shown in FIG. 14 (c), when the readjustment (second time) of the load of the segment 4 is completed, there is no product in which the work assignment period spans the segments 4 and 5, The load readjustment of the segment 4 ends (segment S109: YES).
[0140]
When it is determined that the adjustment of the segment S is to be ended (segment S109: YES), S = S + 1 is set (step S110). Then, it is checked whether or not the entire adjustment is completed (step S111). Here, the condition for terminating the overall adjustment is that, in all the segments, the number of products whose work allocation period spans the preceding and succeeding segments is 1 or less. In the present embodiment, since the condition for terminating the entire adjustment is not satisfied (step S111: NO), the process returns to step S103 and the segment S is readjusted.
[0141]
・ Adjustment of load of segment 5
In readjusting the load of the segment S, first, the processing priority setting unit 35 determines the processing priority of the products allocated to the segment S (step S103). In the present embodiment, among the products assigned to the segment 5, the shorter the work allocatable period and the shorter the setup change time, the higher the processing priority of the product is determined.
[0142]
Next, the load aggregating unit 36 determines one segment for which the load is aggregated in the segment S (step S104). In the present embodiment, as shown in FIG. 14 (c), the products g and i allocated to the segment 5 have the same work allocatable period and the same setup change time. Give priority to target products. Then, for the products selected in step S104, the load on the segment S is consolidated (step S105). In the present embodiment, the load of the product g is 0.4 assigned to the segment 6, but the load of 0.2 is consolidated into the segment 5.
[0143]
On the other hand, the load spreading unit 37 selects one product whose load is to be moved from the segment S (step S106). In the present embodiment, the remaining product i is selected as a load spreading target product. Then, the load is moved from the segment S for the product selected in step S106 (step S107). In the present embodiment, since the product i has a load of 0.2 assigned to the segment 5, the load is added to the segment 6.
[0144]
Then, the in-segment end condition determining unit 38 checks whether the total load of each segment matches the work assignment table 23 obtained by the load crushing unit 34 (step S108). In this embodiment, at this time, the total load of the segment 6 is also 0.6, which is the same as the work allocation table 23 (see FIG. 13A) obtained by the load crusher 34. In addition, the total load of the segment 5 also becomes 1, which is the same as the work allocation table 23 (see FIG. 13A) obtained by the load crusher 34. (Step S108: YES). FIG. 14D shows the work assignment table 23 as a result of the readjustment of the load of the segment 5.
[0145]
When it is determined in step S108 that the total load of each segment matches the work allocation table 23 obtained by the load crushing unit 34 (step S108: YES), whether to end the adjustment of the segment S is determined. Is checked (step S109). In the present embodiment, as shown in FIG. 14 (a), when the readjustment of the load on the segment 2 is completed, only one product g has the work assignment period spanning the segments 5 and 6, since Then, the load readjustment of the segment 5 ends (segment S109: YES).
[0146]
When it is determined that the adjustment of the segment S is to be ended (segment S109: YES), S = S + 1 is set (step S110). Then, it is checked whether or not the entire adjustment is completed (step S111). In the present embodiment, the condition for ending the overall adjustment is satisfied (step S111: YES), and the readjustment of the segment S is ended.
[0147]
In this way, the load of the segments 1 to 5 is readjusted, and a product to be operated in each segment can be determined (scheduling). FIG. 15 is a Gantt chart showing an example of a schedule created based on the work assignment table obtained as a result of the readjustment of the load described above.
[0148]
As described above, in the present embodiment, by using the process load adjusting device 1 that performs load adjustment in units of segments and also achieves a degree of freedom in scheduling according to process information and characteristics of types, It has the following advantages not found in the prior art.
[0149]
Using the work assignment table 23 in which a plurality of segments divided by a predetermined time width (8 hours) are set, load adjustment is performed for each passing process for each product in units of segments. In addition, work is assigned to a plurality of segments corresponding to the work assignable period for each product type stored in the process information memory 20. Therefore, it is possible to give the degree of freedom of work assignment to the time width of the segment or more while performing the load adjustment set by the time width of the segment (8 hours). For this reason, lot planning and order control can be easily performed at the time of planning in the execution system (schedule planning), so that production costs can be reduced and quality can be stabilized. Further, once all the operations are assigned to the segments, the load is moved (hillslide) with the unit load amount as a unit from the segment with the higher load. Therefore, the load can be adjusted efficiently.
[0150]
In other words, a long-term plan that can increase the accuracy when linked to a schedule plan can be created even in a multi-product process with many operational restrictions. In addition, when the long-term plan created in this manner is transferred to the schedule plan, only a small amount of correction is required, so that the calculation load required for creating the schedule plan can be reduced.
[0151]
The unit load amount calculation unit 32 adds a uniform load amount to the segment corresponding to the allocatable period for each passing process for each product. The total amount of load added to each segment is equal to the amount of load in the process. This makes it possible to evaluate the process load when work is allocated with equal probability to segments within the allocatable period.
[0152]
As for the work allocation period stored in the process information memory 21, a different work allocatable period is set depending on the process information and the product type. As a result, in the process of performing lot batching and arrangement order adjustment, the assignable period is set longer, or the general-purpose type is easily integrated into lots, so the assignable period is set shorter, and the special type is assigned. Practical settings can be made in accordance with process information and product characteristics, such as setting a longer possible period.
[0153]
In addition, since the unit load amount is assigned to each segment within the work allocatable period based on the inter-process lead time, the load amount can be piled up in consideration of the inter-process lead time. It is possible to perform load adjustment.
[0154]
The process load index calculated by the inter-process lead time setting unit 31 quantifies the magnitude of the load for each process within the planning period. On the other hand, the inter-process lead time calculated by the inter-process lead time setting unit 31 is set based on the moving time of the preceding and following processes and the margin time in the subsequent process. At this time, the margin time in the post-process is set longer as the process load index is larger. As a result, in a process with insufficient capacity, the time from the arrival of the process to the start of the process becomes longer. In other words, the process has a large amount of in-process inventory in a process with no capacity, and does not have the in-process inventory in a process with a capacity. For this reason, it is possible to prevent an opportunity loss in a neck process due to an operation trouble in an upper process or a delay in progress without increasing the entire construction period from the start to the completion of production.
[0155]
When the load crushing unit 34 crushes the load in a certain segment in a certain process, the time interval between the work start segment and the end segment in the post-movement state is calculated as a movement penalty for the movement of each unit work. I do. At this time, the movement of the unit work having a small movement penalty is prioritized. Thereby, it is possible to prevent the workable segments of the same product from being scattered due to the landslide. That is, the load can be collapsed without increasing the residence time in the process as much as possible.
[0156]
The inter-process lead time determination unit 34a corrects the work time zone in the preceding and succeeding processes when the lead time from the preceding and following processes cannot be secured as a result of the load crush in the certain process. This makes it possible to create a plan in which the lead time between processes is secured.
[0157]
When performing the load crushing in a certain step in the load crushing section 34, the unit work can be moved so that the influence on the preceding and following steps is minimized.
[0158]
When the load crushing unit 34 performs load crushing in a certain process, a segment having a margin for the process capability is preferentially selected as a destination of the unit work. Thereby, load leveling can be performed efficiently.
[0159]
The processing priority setting unit 35, the load aggregating unit 36, the load spreading unit 37, and the in-segment end condition determining unit 38 determine the degree of freedom of work assignment set based on the long-term plan obtained as a result of the load crush. Within the range, the load is readjusted. As a result, a processing product for each segment in each process is determined. This makes it possible to create a schedule that is consistent with the long-term plan.
[0160]
In the load spreading section 37, readjustment of the load amount is performed while maintaining the total load amount after the load collapse. Therefore, it is possible to prevent the load from being overloaded as a result of the readjustment of the load amount.
[0161]
The processing priority setting unit 35 gives priority to the processing of a product in which the period in which the work is allocated is short and the setup change time is short. Therefore, it is easy to make a schedule within the work allocatable period set in the long-term plan, and it is easy to create a practical schedule that is consistent with the long-term plan.
[0162]
As described above, the preferred embodiments of the present invention have been described. However, the present invention is not limited to the above-described embodiments, and various design changes can be made within the scope of the claims. .
[0163]
In the present embodiment, when creating a schedule, the maximum load of each segment is set as one day, but the present invention is not limited to this. For example, a maximum load may be set for each segment.
[0164]
Further, in the present embodiment, the work assignment table 23 created by the long-term plan of the present embodiment is used for creating the schedule, but the work assignment table 23 is not limited thereto, and the work assignment table created by the long-term plan of the present embodiment is used. It may also be used for processing of a work allocation table other than the table 23 (the load distribution is similar to the work allocation table 23 described above).
[0165]
【The invention's effect】
As described above, according to the present invention, it is possible to create a long-term plan that can increase the accuracy when linked to a schedule even in a multi-product process with many operational restrictions. In addition, when the long-term plan created in this manner is transferred to the schedule plan, only a small amount of correction is required, so that the calculation load required for creating the schedule plan can be reduced.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a process load adjusting device.
FIG. 2 is a flowchart showing a processing flow for creating a long-term plan.
FIG. 3 is a diagram showing process information on a passing process for each type.
FIG. 4 is a view showing a target process.
FIG. 5 is a diagram showing product information to be planned;
FIG. 6 is a diagram showing a calculation result of a process load index.
FIG. 7 is a diagram showing the relationship among work assignable periods, unit load amounts, and inter-process lead times for each product type.
FIG. 8 is a diagram showing a work assignment table.
FIG. 9 is a diagram of a work assignment table showing an example of a load crushing.
FIG. 10 is a diagram showing a movement of a unit work of a specific type showing an example of a load crushing;
FIG. 11 is a diagram of a movement of a unit work in a specific process showing another example of the load crushing.
FIG. 12 is a flowchart showing a processing flow for creating a schedule;
FIG. 13 is a diagram illustrating a movement of a unit operation in a specific process, illustrating an example of consolidating and adjusting loads.
FIG. 14 is a diagram of a movement of a unit work in a specific process, showing an example of consolidating and adjusting loads.
FIG. 15 is a Gantt chart showing an example of a schedule created based on the work assignment table obtained as a result of the readjustment of the load.
[Explanation of symbols]
1 Process load adjustment device
21 Process information memory (process information storage means)
22 Product information memory (product information storage means)
23 Work assignment table
31 Inter-process lead time setting section (inter-process lead time setting means)
32 Unit load amount calculation unit (unit load amount calculation means)
33 Load pile part (load pile means)
34 Load Slope (Load Slope Means)

Claims (39)

Product information storage means for storing, for each type, the quantity to be manufactured for a plurality of types of products manufactured through a plurality of processes;
For each type, the order of the steps that are passed to manufacture the type, the load amount corresponding to the unit work in each step, and the period in which the work related to each step can be assigned to a predetermined time width Process information storage means for storing process information including a work allocatable period represented by the number of divided segments;
For each of the plurality of segments, a work assignment table storage means for storing a work assignment table in which the work capacity in the segment and the load amount in the segment are registered for each process,
On the basis of the load amount and the work allocatable period corresponding to the unit work stored in the process information storage unit, the load amount corresponding to the unit work assigned per segment within the work allocatable period for each product type and each process. A unit load amount calculating means for calculating a certain unit load amount;
The work assignment table is obtained by adding a unit load assigned to each segment within the work assignable period to each product for each process in consideration of the quantity to be manufactured stored in the product information storage means. Load stacking means for performing load stacking registered in the
Until the amount of load registered in the segment of the work assignment table by the load stacking means becomes equal to or less than the work capacity of the segment stored in the work assignment table storage means, the load on the work capacity stored in the work assignment table Load crushing means for performing load crushing in which the load amount registered in the work allocation table is moved to another segment in units of the unit load amount with priority from the segment having a large amount ratio. A process load adjusting device. The unit load,
2. The process load adjusting device according to claim 1, wherein the calculation is performed as: unit load = load corresponding to unit work in each process / work assignment possible period. 3. The process load adjusting device according to claim 1, wherein the work allocable period is determined by the process information or the product type. In the load crushing, when moving the load amount registered in the work allocation table to another segment, when moving in the backward direction, priority is given to the load amount corresponding to a product having a spare delivery date, The process load adjusting device according to any one of claims 1 to 3, wherein, when moving in a forward direction, priority is given to a load amount corresponding to a product having a margin at the early re-start time. The process information storage means further stores, for each product type, an inter-process lead time that is a lead time between the processes,
5. The method according to claim 1, wherein the load stacking unit allocates a unit load amount to each segment within the work allocatable period based on the inter-process lead time stored in the process information storage unit. 2. The process load adjusting device according to claim 1. Further comprising an inter-process lead time setting means for calculating the inter-process lead time,
The inter-process lead time setting means, for each of the processes, a process load index which is an index for determining the degree of load of the process within the planning period,
Process load index = Calculated as the total amount of load in the process / the total work capacity in the process within the planning period, and the lead time between processes is calculated as
The lead time between processes is calculated as: lead time between processes before and after the process + margin time in the subsequent process, and the margin time in the subsequent process is set longer as the process load index is larger. Process load adjustment device. When the load amount registered in the work allocation table is moved to another segment in the load crushing, when the load is moved forward, the lead time with the immediately preceding process is moved, and the load is moved backward. In the case where it is made to further calculate the lead time with the immediately following process, further comprising an inter-process lead time determining means for determining whether the inter-process lead time is secured,
When it is determined by the inter-process lead time determination means that the inter-process lead time is not secured, when the load is moved forward, the load amount in the immediately preceding process is moved forward, 7. The process load adjusting device according to claim 5, wherein, when moved in the backward direction, the load amount in the immediately subsequent process is moved to the subsequent process. If it is determined that the inter-process lead time is not secured, when moving the load amount in the forward or backward direction, the load amount with the smaller number of segments to be moved is prioritized. 8. The process load adjusting device according to 7. In moving the load registered in the work allocation table in the load crushing, the load is preferentially applied to a segment in which the ratio of the load to the work capacity after moving the load is reduced. The process load adjusting device according to any one of claims 1 to 8, wherein the amount is moved. Processing priority setting means for setting a processing priority of a product for each segment;
A load aggregation for selecting one product based on the processing priority for any one segment and moving at least a part of the load amount registered in the work allocation table for the selected product to the segment. Load aggregation means for performing
A product other than the product selected by the load aggregation means is selected based on the processing priority, and at least a part of the load amount registered in the work allocation table for the selected product is changed from the segment to another product. Load spreading means for performing load spreading to be moved to the segment;
Assuming that the segment is the Nth segment, the number of products whose load amount has been registered across the (N-1) th segment and the Nth segment is 1 or less, and extends across the Nth segment and the (N + 1) th segment. When the condition that the number of products whose load amount is registered is 1 or less is satisfied, an in-segment end condition determining unit for determining the end of the transfer of the load amount by the load aggregation unit and the load spreading unit. The process load adjusting device according to any one of claims 1 to 9, further comprising: In the load spreading, the sum of the load amounts of the arbitrary one segment registered in the work allocation table before the load aggregation is performed for all products and the load amount is moved from the segment to another segment. The process load adjusting device according to claim 10, wherein the amount of load to be moved is determined so that the total amount of the load amounts of the segments after the segment is equal to the total amount of the products. The processing priority is set higher for a product having a smaller number of registered segments of a load amount among products whose load amounts are registered over a plurality of segments including the arbitrary one segment. The process load adjusting device according to claim 10. The processing priority is set higher for a product having a shorter setup change time among products whose load amount is registered across a plurality of segments including the arbitrary one segment. A process load adjusting device according to claim 12. A product information storage step of storing, for each product type, a quantity to be manufactured for a plurality of product types manufactured through a plurality of processes;
For each type, the order of the steps that are passed to manufacture the type, the load amount corresponding to the unit work in each step, and the period in which the work related to each step can be assigned to a predetermined time width A process information storing step of storing process information including a work allocatable period represented by the number of divided segments;
For each of the plurality of segments, a work allocation table storing step of storing a work allocation table in which the work capacity in the segment and the load amount in the segment are registered for each process;
On the basis of the load amount and the work allocatable period corresponding to the unit work stored in the process information storage step, the load amount corresponding to the unit work assigned per segment within the work allocatable period for each product type and each process. A unit load calculation step for calculating a certain unit load;
The work assignment table is obtained by adding the unit load assigned to each segment within the work assignable period for each process for all types in consideration of the quantity to be manufactured stored in the product information storage step. A load stacking step of performing load stacking registered in the
Until the load amount registered in the segment of the work assignment table in the load stacking step becomes equal to or less than the work ability of the segment stored in the work assignment table storage step, the load on the work capacity stored in the work assignment table is reduced. A load crushing step of performing load crushing in which the load amount registered in the work allocation table is moved to another segment in units of unit load amount, with priority given to segments having a large amount ratio. A process load adjusting method characterized by the above-mentioned. The unit load,
15. The process load adjustment method according to claim 14, wherein the unit load amount is calculated as: load amount corresponding to unit work in each process / work assignment possible period. 16. The process load adjusting method according to claim 14, wherein the work allocable period is determined by the process information or the product type. In the load crushing, when moving the load amount registered in the work allocation table to another segment, when moving in the backward direction, priority is given to the load amount corresponding to a product having a spare delivery date, 17. The process load adjusting method according to claim 14, wherein, when moving in the forward direction, priority is given to a load amount corresponding to a product having a margin at the early re-start time. In the process information storage step, for each type, further stores an inter-process lead time that is a lead time between the processes,
18. The load stacking step, wherein a unit load amount is assigned to each segment within the work allocatable period based on the inter-process lead time stored in the process information storing step. The process load adjusting method according to claim 1. The method further comprises an inter-process lead time setting step of calculating the inter-process lead time,
In the inter-process lead time setting step, for each of the processes, a process load index, which is an index for determining the degree of load of the process within the planning period,
Process load index = Calculated as the total amount of load in the process / the total work capacity in the process within the planning period, and the lead time between processes is calculated as
19. The lead time between processes = calculation time as moving time between preceding and succeeding processes + leaving time in a succeeding process, and the surplus time in the succeeding process is set longer as the process load index is larger. Process load adjustment method. When the load amount registered in the work allocation table is moved to another segment in the load crushing, when the load is moved forward, the lead time with the immediately preceding process is moved, and the load is moved backward. The method further comprises an inter-process lead time determining step of calculating a lead time with the immediately following process in the case where the process is performed, and determining whether or not the inter-process lead time is secured,
In the inter-process lead time determination step, when it is determined that the inter-process lead time is not ensured, when moved forward, the load amount in the immediately preceding process is moved forward, 20. The process load adjusting method according to claim 18, wherein, when moved in the backward direction, the load amount in the immediately subsequent process is moved to the subsequent process. If it is determined that the inter-process lead time is not secured, when moving the load amount in the forward or backward direction, the load amount with the smaller number of segments to be moved is prioritized. 20. The process load adjusting method according to 20. In moving the load registered in the work allocation table in the load crushing, the load is preferentially applied to a segment in which the ratio of the load to the work capacity after moving the load is reduced. 22. The process load adjusting method according to claim 14, wherein the amount is moved. A processing priority setting step of setting a processing priority of a product for each segment;
Load consolidation for selecting one product for any one segment based on the processing priority and moving at least a part of the load amount registered in the work allocation table for the selected product to the segment. A load aggregation step to be performed;
A product other than the product selected by the load aggregation means is selected based on the processing priority, and at least a part of the load amount registered in the work allocation table for the selected product is changed from the segment to another product. A load spreading step for performing load spreading to be moved to the segment;
Assuming that the segment is the Nth segment, the number of products for which the load amount is registered across the (N-1) th segment and the Nth segment is 1 or less, and extends across the Nth segment and the (N + 1) th segment. When the condition that the number of products whose load amount is registered is 1 or less is satisfied, an in-segment end condition determining step for determining the end of the load amount transfer by the load aggregation step and the load spreading step is further performed. The process load adjusting method according to any one of claims 14 to 22, wherein the method is provided. In the load spreading, the sum of the load amounts of the arbitrary one segment registered in the work allocation table before the load aggregation is performed for all products and the load amount is moved from the segment to another segment. 24. The process load adjusting method according to claim 23, wherein the amount of load to be moved is determined so that the total amount of the load amount of the segment after the segment is equal to the sum of all the products. The processing priority is set higher for a product having a smaller number of registered segments of a load amount among products whose load amounts are registered over a plurality of segments including the arbitrary one segment. The process load adjusting method according to claim 23 or 24, wherein The processing priority is set higher for a product having a shorter setup change time among products whose load amount is registered across a plurality of segments including the arbitrary one segment. 25. The process load adjusting method according to 25. Product information storage means for storing the quantity to be manufactured for a plurality of types of products manufactured through a plurality of processes for each type;
For each product type, the order of the processes to be passed to manufacture the product type, the load corresponding to the unit work in each process, and the period in which the work related to each process can be allocated to a predetermined time width Process information storage means for storing process information including a work allocatable period represented by the number of divided segments,
A work assignment table storage unit for storing a work assignment table in which the work capacity in the segment and the load amount in the segment are registered for each process for each of the plurality of segments;
On the basis of the load amount and the work allocatable period corresponding to the unit work stored in the process information storage means, the load amount corresponding to the unit work assigned per segment within the work allocatable period for each product type and each process. A unit load amount calculating means for calculating a certain unit load amount,
The work allocation table is obtained by adding a unit load amount allocated to each segment within the work allocatable period for each process in consideration of a quantity to be manufactured stored in the product information storage means for each process. Load stacking means for performing load stacking registered in;
The load on the work capacity stored in the work assignment table until the load amount registered in the segment of the work assignment table by the load stacking means becomes equal to or less than the work capacity of the segment stored in the work assignment table storage means. The computer functions as a load crushing means for performing load crushing in which the load amount registered in the work allocation table is moved to another segment in units of unit load amount, with priority given to segments having a large amount ratio. A program characterized by causing The unit load,
28. The program according to claim 27, wherein the calculation is performed as: unit load = load corresponding to unit work in each process / work assignment possible period. 29. The program according to claim 27, wherein the work allocable period is determined by the process information or the product type. In the load crushing, when moving the load amount registered in the work allocation table to another segment, when moving in the backward direction, priority is given to the load amount corresponding to a product having a spare delivery date, The program according to any one of claims 27 to 29, wherein when moving in the forward direction, priority is given to a load amount corresponding to a product having a margin at the early re-start time. The process information storage means further stores, for each product type, an inter-process lead time that is a lead time between the processes,
31. The load stacking unit according to claim 27, wherein a unit load amount is assigned to each segment within the work allocatable period based on the inter-process lead time stored in the process information storage unit. Or the program according to claim 1. The computer further functions as an inter-process lead time setting means for calculating the inter-process lead time,
The inter-process lead time setting means, for each of the processes, a process load index which is an index for determining the degree of load of the process within the planning period,
Process load index = Calculated as the total amount of load in the process / the total work capacity in the process within the planning period, and the lead time between processes is calculated as
32. The lead time between processes is calculated as a time required for movement between preceding and succeeding processes + an extra time in a subsequent process, and the extra time in the subsequent process is set longer as the process load index is larger. Program. When the load amount registered in the work allocation table is moved to another segment in the load crushing, when the load is moved forward, the lead time with the immediately preceding process is moved, and the load is moved backward. Calculate the lead time with the immediately following process in the case where it is made to further function the computer as an inter-process lead time determining means for determining whether the inter-process lead time is secured,
When it is determined by the inter-process lead time determination means that the inter-process lead time is not ensured, when the load is moved forward, the load amount in the immediately preceding process is moved forward, 33. The program according to claim 31, wherein, when moved in a backward direction, a load amount in a process immediately after is moved to a subsequent process. If it is determined that the inter-process lead time is not secured, when moving the load amount in the forward or backward direction, the load amount with the smaller number of segments to be moved is prioritized. The program according to claim 33. In moving the load registered in the work allocation table in the load crushing, the load is preferentially applied to a segment in which the ratio of the load to the work capacity after moving the load is reduced. The program according to any one of claims 27 to 34, wherein the amount is moved. Processing priority setting means for setting a processing priority of a product for each segment;
A load aggregation for selecting one product based on the processing priority for any one segment and moving at least a part of the load amount registered in the work allocation table for the selected product to the segment. Load aggregation means to perform,
A product other than the product selected by the load aggregation means is selected based on the processing priority, and at least a part of the load amount registered in the work allocation table for the selected product is changed from the segment to another product. Load spreading means for performing load spreading to move to a segment, and
Assuming that the segment is the Nth segment, the number of products whose load amount has been registered across the (N-1) th segment and the Nth segment is 1 or less, and extends across the Nth segment and the (N + 1) th segment. When the condition that the number of products whose load amount is registered is 1 or less is satisfied, the in-segment end condition determining means for determining the end of the movement of the load amount by the load aggregating means and the load spreading means. The program according to any one of claims 27 to 35, further causing a computer to function. In the load spreading, the sum of the load amounts of the arbitrary one segment registered in the work allocation table before the load aggregation is performed for all products and the load amount is moved from the segment to another segment. 37. The program according to claim 36, wherein the amount of load to be moved is determined so that the total amount of the load amount of the segment after the segment is equal to the sum of all the products. The processing priority is set higher for a product having a smaller number of registered segments of a load amount among products whose load amounts are registered over a plurality of segments including the arbitrary one segment. The program according to claim 36 or 37, wherein The processing priority is set higher for a product having a shorter setup change time among products whose load amount is registered across a plurality of segments including the arbitrary one segment. 38. The program according to 38.

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