JP6388486B2 - Production planning device, production planning method, and production planning program - Google Patents

Description

  The present invention relates to a production planning device, a production planning method, and a production planning program.

  In order to realize efficient production of products, it is important to make a suitable production plan. For example, in Patent Document 1, after drafting a part machining plan corresponding to an increase in the number of models of finished products, production volume fluctuations, etc., for a neck process in which the order is concentrated, a machining plan for a process before and after the neck process is drafted. Technology is disclosed.

JP-A-11-852

  Various requirements such as the number of stocks and costs are involved in product production. For this reason, there is a need for evaluating a production plan from various viewpoints and thereby creating a suitable production plan. The present invention has been made in view of the above, and provides a production plan planning device, a production plan planning method, and a production plan planning program capable of formulating a suitable production plan evaluated from various viewpoints. With the goal.

  In order to solve the above-described problems, the present invention provides a production plan planning apparatus, wherein the product is calculated based on shipment schedule information in which the production plan and the shipment schedule of the product are stored, and Production evaluated based on inventory quantity of parts constituting the product, operation status of the production facility for producing the product and the part calculated based on the production plan, and an evaluation value of the production facility A plan evaluation unit; and a production plan search unit that searches for a suitable production plan based on an evaluation result of the production plan evaluation unit, wherein the production plan search unit is configured to produce a shortage of a production plan or the shipment When the shipping schedule is later than the schedule information, the production plan is searched by changing at least one of the operation status of the production facility and the shipping schedule information.

  It is preferable that the production plan search unit weights a change between the operation status of the production facility and the shipping schedule information, changes the weight, and searches the production plan by repeated calculation.

  Moreover, it is preferable that the said production plan search part makes the production plan of a search result the production plan with few changes of the operating condition of the said production facility and the said shipping schedule information.

  Moreover, it is preferable that the said production plan search part makes the said some production plan the production plan of a search result.

  The operating status of the production facility preferably includes at least one of an upper limit of production capacity, a production location, and production parts.

  The production plan evaluation unit preferably evaluates the production plan higher as the inventory quantity calculated in consideration of the accuracy of order receipt is closer to the appropriate inventory quantity set for each product and each part. .

  In order to solve the above-described problems, the present invention provides a production plan planning method executed by a production plan planning apparatus, wherein a product production plan is converted into shipment schedule information in which the production plan and the product shipment schedule are stored. The inventory quantity of the product calculated based on the product and the parts constituting the product, the operation status of the production facility for producing the product and the part calculated based on the production plan, and the evaluation of the production facility A step of evaluating based on the value, a step of searching for a suitable production plan based on the result of evaluating the production plan, a case where a shortage occurs in the production plan, or a case where the shipping schedule is later than the shipping schedule information And a step of searching for the production plan by changing at least one of the operation status of the production facility and the shipping schedule information.

  In order to solve the above-mentioned problems, the present invention relates to the product and the product which are calculated based on the shipping schedule information in which the production plan and the shipping schedule of the product are stored in the production planning device. Evaluating based on the inventory quantity of parts constituting the product, the operation status of the production facility for producing the product and the part calculated based on the production plan, and the evaluation value of the production facility; A step of searching for a suitable production plan based on the result of evaluating the production plan, and when a shortage occurs in the production plan or when the shipment schedule is later than the shipment schedule information, the operation status of the production facility and the shipment A step of searching for the production plan by changing at least one of the schedule information.

  The production plan planning device, the production plan planning method, and the production plan planning program according to the present invention have an effect that a suitable production plan evaluated from various viewpoints can be created.

FIG. 1 is a block diagram illustrating a configuration of a production plan planning apparatus according to the present embodiment. FIG. 2 is a diagram illustrating an example of configuration information. FIG. 3 is a diagram illustrating an example of production means information. FIG. 4 is a diagram illustrating an example of compatibility information. FIG. 5 is a diagram illustrating an example of shipping schedule information. FIG. 6 is a diagram illustrating an example of inventory information. FIG. 7 is a diagram illustrating an example of the operation status evaluation parameter. FIG. 8 is a diagram illustrating an example of the QCD evaluation parameter. FIG. 9 is a diagram illustrating an example of a change in inventory quantity with time. FIG. 10 is a diagram illustrating an example of evaluation values when order accuracy is taken into consideration. FIG. 11 is a diagram illustrating an example of evaluation values when order accuracy is not taken into consideration. FIG. 12 is a diagram illustrating an example of the evaluation of the operation status of the production facility. FIG. 13 is a diagram illustrating an example in which the criteria for evaluating the operating status of a production facility change. FIG. 14A is a flowchart illustrating a processing procedure of a production plan planning process. FIG. 14B is a flowchart illustrating the processing procedure of the neighborhood solution search processing. FIG. 15 is a diagram illustrating an example in which the quantity of products or parts produced is switched. FIG. 16 is a diagram illustrating an example of increasing the quantity of products or parts produced. FIG. 17 is a diagram illustrating an example of reducing the quantity of products or parts produced. FIG. 18 is a diagram illustrating an example of changing a time when a product or a part is produced. FIG. 19 is a diagram illustrating an example of changing a product or a part to be produced. FIG. 20 is a diagram illustrating an example of changing the production means. FIG. 21 is a diagram illustrating an example of production plan information in which an initial plan is stored. FIG. 22 is a diagram illustrating an example of production plan information in which a searched suitable production plan is stored. FIG. 23 is a diagram illustrating an example of production plan information in which a production plan for a part to be produced is stored. FIG. 24 is a diagram illustrating an example of changing a production plan. FIG. 25 is a flowchart showing the processing procedure of the condition changing process. FIG. 26 is a diagram illustrating an example of production capacity. FIG. 27 is a diagram illustrating an example of a change in production capacity. FIG. 28 is a diagram illustrating an example of demand information. FIG. 29 is a diagram illustrating an example of changing demand information.

  Embodiments of a production plan planning device, a production plan planning method, and a production plan planning program according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, the constituent elements in this embodiment include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those in a so-called equivalent range.

  First, the configuration of the production plan planning apparatus according to the present embodiment will be described. FIG. 1 is a block diagram illustrating a configuration of a production plan planning apparatus according to the present embodiment. A production plan planning apparatus 10 shown in FIG. 1 is connected to a production management system 20 and drafts a production plan for a product based on the planned shipment number of products managed by the production management system 20.

  In the present embodiment, the “production plan” refers to a plan indicating when and how much a product and its parts (materials) are produced using which production facility. In this embodiment, “product” means a product produced using a production facility, and does not necessarily mean a final product. That is, the “product” described in the present embodiment may include “parts” incorporated into other products.

  As shown in FIG. 1, the production plan planning device 10 includes a display unit 11, an input unit 12, a communication unit 13, a medium reading unit 14, a control unit 15, and a storage unit 16.

  The display unit 11 includes a display device such as a liquid crystal display (LED) or an organic EL display (OELD), and displays various information such as characters and figures based on a control signal transmitted from the control unit 15. The input unit 12 includes an input device such as a keyboard, and outputs a signal corresponding to an operation performed by the user to the input device to the control unit 15. The communication unit 13 controls transmission / reception of information with other devices based on a predetermined communication protocol. The medium reading unit 14 reads programs and data from a storage medium such as a CD-ROM, DVD-ROM, or memory card.

  The control unit 15 includes a CPU (Central Processing Unit) 151 that is a calculation unit and a memory 152 that is a storage unit, and implements various functions by executing programs using these hardware resources. Specifically, the control unit 15 reads out a program stored in the storage unit 16 and expands it in the memory 152, and causes the CPU 151 to execute an instruction included in the program expanded in the memory 152. The control unit 15 reads / writes data from / to the memory 152 and the storage unit 16 and controls the operation of the communication unit 13 and the like according to the execution result of the instruction by the CPU 151.

  The storage unit 16 includes a nonvolatile storage device such as a magnetic storage device or a semiconductor storage device, and stores various programs and data. The data stored in the storage unit 16 includes configuration information 160, production means information 161, compatibility information 162, shipping schedule information 163, inventory information 164, inventory evaluation parameters 165, and operation status evaluation parameters 166. A QCD evaluation parameter 167, production plan information 168, and a constraint condition change parameter 169. The programs stored in the storage unit 16 include a production planning program 170.

  Note that all or part of the programs and data that are stored in the storage unit 16 in FIG. 1 may be stored in a storage medium that can be read by the medium reading unit 14. Further, all or part of the program and data that the storage unit 16 stores in FIG. 1 may be acquired from another device through communication by the communication unit 13.

  The configuration information 160 holds information related to the product configuration. FIG. 2 is a diagram illustrating an example of the configuration information 160. As shown in FIG. 2, the configuration information 160 includes items such as a product number and a part number. The configuration information 160 is configured to hold a plurality of part number values for one product number value.

  The product number field stores a number for identifying a product to be produced. In the part number item, a number for identifying a part constituting the product is stored.

  In the first to third lines of the configuration information 160 shown in FIG. 2, the product identified by the product number “A01” is identified by the part identified by the part number “B01” and the part number “B02”. And a part identified by a part number “B03”. In the fourth to sixth lines of the configuration information 160 shown in FIG. 2, the product identified by the product number “A02” is identified by the part identified by the part number “B01” and the part number “B02”. And a part identified by a part number “B13”. In the seventh to ninth lines of the configuration information 160 shown in FIG. 2, the product identified by the product number “A03” is identified by the part identified by the part number “B21” and the part number “B22”. And a part identified by a part number “B23”.

  In the present embodiment, it is assumed that the parts constituting the product are managed in only one hierarchy, but the configuration information 160 may be configured so that the parts constituting the product can be managed across a plurality of hierarchies. . That is, the configuration information 160 may be configured so as to be able to hold information related to the configuration of parts.

  The production means information 161 holds information related to production means for producing products or parts. In this embodiment, the “production means” means a combination of a production facility for producing a product or a part and a classification of whether the product or part is newly produced or produced by modification. The “production facility” is, for example, a factory, a production line, or a production apparatus. “Modification” refers to production of another product or part by adding, changing, or deleting the configuration of the product or part.

  FIG. 3 is a diagram showing an example of the production means information 161. As shown in FIG. As shown in FIG. 3, the production means information 161 has items such as product / part number, production facility, and remodeling facility.

  In the product / part number item, a product number or a part number is stored. The production facility item stores a list of numbers for identifying production facilities used for newly producing corresponding products or parts. When there are a plurality of production facilities used for newly producing products or parts, numbers corresponding to the respective production facilities are stored in the item of the production facility. The remodeling facility item stores a list of combinations of numbers for identifying the production facility used to produce the corresponding product or part by remodeling and numbers for identifying the product or part to be remodeled. .

  In the first line of the production means information 161 shown in FIG. 3, the product identified by the product number “A01” is the production facility identified by the number “X01” or the production facility identified by the number “X02”. Shows that it can be newly produced. Further, in the first line of the production means information 161 shown in FIG. 3, the product identified by the product number “A01” is identified by the product number “A02” at the production facility identified by the number “X01”. The product can be produced by modifying the product identified by the product number “A02” at the production facility identified by the number “X02”.

  The third line of the production means information 161 shown in FIG. 3 indicates that the product identified by the product number “A03” can be newly produced only at the production facility identified by the number “X03”. Yes. Further, in the third line of the production means information 161 shown in FIG. 3, the item of the remodeling facility is blank. This is because the product identified by the product number “A03” is produced by remodeling other products. Indicates that you cannot do it.

  The compatibility information 162 holds information about compatibility of parts and products to be produced. FIG. 4 is a diagram illustrating an example of the compatibility information 162. As shown in FIG. 4, the compatibility information 162 has a correspondence relationship between the part number of a part and the part number of a part that can be used in the same manner as the part.

  The shipping schedule information 163 holds information about when and how many products are scheduled to be shipped. FIG. 4 is a diagram illustrating an example of the shipping schedule information 163. As shown in FIG. 5, the shipping schedule information 163 includes a product number item, a shipping schedule quantity and an order accuracy item provided for each date.

  The product number field stores a number for identifying a product to be produced. In the item of the shipping scheduled quantity, the quantity scheduled to ship the product corresponding to the corresponding date is stored. The order accuracy item stores the accuracy with which a contract for shipping a product corresponding to a corresponding date can be received. In the order accuracy item, for example, “100%” is stored when the order is certain, and when the probability of losing is half, that is, the shipment of the product corresponding to the corresponding date becomes unnecessary. If the probability is half, “50%” is stored. The value of the order accuracy item may be set based on, for example, a sales representative's expectation, may be set based on past results, or may be set to a lower value as the date is earlier. May be set.

  The inventory information 164 holds information regarding the inventory of products and parts. FIG. 6 is a diagram illustrating an example of the inventory information 164. As shown in FIG. 6, the inventory information 164 includes items such as a product / part number, an appropriate inventory quantity, and an inventory quantity.

  In the product / part number item, a product number or a part number is stored. The appropriate stock quantity item stores the proper stock quantity of the corresponding product or part. The inventory quantity field stores the inventory quantity of the corresponding product or part at the start of the production plan. The appropriate inventory quantity can be set as a quantity that varies depending on the time. That is, the appropriate inventory quantity may be changed depending on the time. For example, for a specific part, the appropriate inventory quantity before August 31, 20XX can be set to 10 and the appropriate inventory quantity after September 1, 20XX can be set to 20.

  In the first line of the inventory information 164 shown in FIG. 6, “10” is appropriate for the product identified by the product number “A01”, but “15” at the start of the production plan. It shows that. In the second line of the inventory information 164 shown in FIG. 6, “10” is appropriate for the product identified by the product number “A02”, but “20” at the start of the production plan. It shows that. The third line of the inventory information 164 shown in FIG. 6 indicates that the inventory of the product identified by the product number “A03” is appropriate “10” at the start of the production plan. .

  The inventory evaluation parameter 165 holds information for evaluating a production plan from the viewpoint of inventory quantity. Evaluation of inventory quantity from the viewpoint of inventory quantity will be described later.

  The operation status evaluation parameter 166 holds information for evaluating the production plan from the viewpoint of the operation status of the production facility. FIG. 7 is a diagram illustrating an example of the operation status evaluation parameter 166. As shown in FIG. 7, the operation status evaluation parameter 166 includes items such as a production facility, a period, a maximum production quantity, an appropriate range upper limit value, an appropriate range lower limit value, a minimum production quantity, an undertime evaluation coefficient, and an overtime evaluation coefficient. . The operation status evaluation parameter 166 is configured to be able to hold a plurality of combinations of values of period to over-time evaluation coefficient for one production facility value.

  In the item of production facility, a number for identifying the production facility is stored. In the item of period, a value indicating a period in which the value of the corresponding item of maximum production quantity to excess evaluation coefficient is valid is stored. If there is no restriction on the period, the period item is blank.

  The maximum production quantity item stores the quantity of products or parts that can be produced when the corresponding production facility is fully operated. In the item of the appropriate range upper limit value, the upper limit of the appropriate range of the quantity of products or parts produced at the corresponding production facility is stored. The appropriate range lower limit value item stores the lower limit of the appropriate range of the quantity of products or parts produced at the corresponding production facility. The item of minimum production quantity stores the quantity of products or parts that should be produced at least in order to maintain the corresponding production facility.

  The under-evaluation coefficient item stores a coefficient used to calculate the evaluation value of the production plan when the production quantity of the product or part falls below the value of the appropriate range lower limit item. The over-evaluation coefficient item stores a coefficient used to calculate the evaluation value of the production plan when the production quantity of the product or part exceeds the value of the appropriate range upper limit value item. The evaluation of the inventory quantity from the viewpoint of the operation status of the production facility will be described later.

  The first line of the operation status evaluation parameter 166 shown in FIG. 7 indicates that the production quantity of the production facility identified by the number “X01” is up to “December 20XX” when the facility is operated to the maximum. “300” indicates that “250” to “150” are appropriate and should be “100” at the minimum. The second line of the operational status evaluation parameter 166 shown in FIG. 7 indicates that the production quantity of the production facility identified by the number “X01” is “Maximum” after “January 20XX”. “350” indicates that “300” to “150” are appropriate and should be “100” at least.

  The third line of the operation status evaluation parameter 166 shown in FIG. 7 indicates that the production quantity of the production facility identified by the number “X02” is “120” when the facility is operated to the maximum regardless of the period. Yes, “100” to “80” are proper and should be “50” at the minimum.

  In the present embodiment, it is assumed that the production quantity stored in the operation status evaluation parameter 166 is a value per month, but the production quantity stored in the operation status evaluation parameter 166 is not limited to this. The production quantity stored in the operation status evaluation parameter 166 may be, for example, a value per day, a value per week, a value per quarter, or a value per year.

  The QCD evaluation parameter 167 holds information for evaluating the production plan from the viewpoint of the appropriateness of selection of the production facility. Specifically, the QCD evaluation parameter 167 holds information for evaluating the production plan from the viewpoint of the QCD of the selected production facility, that is, quality (Q), cost (C), and delivery date (D). . FIG. 8 is a diagram illustrating an example of the QCD evaluation parameter 167. As shown in FIG. 8, the QCD evaluation parameter 167 has items of quality, cost, and delivery date provided separately for the item of production facility and new production and remodeling. The QCD evaluation parameter 167 can further hold quality, cost, and delivery date information for a combination of a production facility and a part manufactured at the production facility. For example, the part A can hold information that can be determined that the production facility X01 can be made cheaper than the production facility X02, but the part B can be made cheaper than the production facility X01.

  In the item of production facility, a number for identifying the production facility is stored. The quality item stores a value indicating the quality of a product or part produced by new production or modification at the corresponding production facility. In the quality item, for example, the yield rate (non-defective product rate) of products or parts is stored.

  In the item of cost, a value indicating the high cost of a product or part produced by new production or modification at the corresponding production facility is stored. In the item of cost, for example, a relative value with the production cost of the production facility having the highest production cost as 100 is stored. In the item of delivery date, a value indicating the certainty of delivery date of a product or part produced by new production or modification at the corresponding production facility is stored. In the item of delivery date, for example, the compliance rate of the delivery date of the product or part is stored.

  The first line of the QCD evaluation parameter 167 shown in FIG. 8 indicates that the production facility identified by the number “X01” has a high quality of “99” and a high cost when a product or part is newly produced. Is “100”, and the certainty of delivery is “100”. Furthermore, the first line of the QCD evaluation parameter 167 shown in FIG. 8 shows that the production facility identified by the number “X01” has a high quality of “99” when the product or part is produced by remodeling, and the cost. The height of “50” is “100”, and the certainty of delivery date is “100”. As shown in this example, even if the production facilities are the same, the QCD may differ depending on whether a product or part is newly produced or produced by modification.

  The production plan information 168 stores the produced production plan. An example of the production plan information 168 will be described later.

  The constraint condition change parameter 169 includes constraint conditions set during the process of calculating the production plan, for example, information for changing the ability to produce the target part and the shipping schedule. An example of the constraint condition change parameter 169 will be described later.

  The production planning program 170 provides a function for creating a suitable production plan. The production plan planning program 170 includes an initial plan creation unit 170a, a production plan evaluation unit 170b, and a production plan search unit 170c.

  The initial plan creation unit 170a provides a function of creating an initial production plan (hereinafter, also referred to as “initial plan”) for producing products and parts based on the shipping schedule information 163 and the like. The initial plan may be any content plan. The initial plan is created based on, for example, the configuration information 160, the production means information 161, the shipping schedule information 163, the inventory information 164, etc. so that the quantity scheduled for each product is scheduled to be shipped. Is done. The initial plan may also be created so that proper inventory quantities of products and parts are maintained.

  The initial plan creation unit 170a can be realized by using an existing technique for creating a production plan or a technique that will be conceived in the future. The initial plan may be created by an external system such as the production management system 20 and transmitted to the production plan planning apparatus 10.

  The production plan evaluation unit 170b provides a function for evaluating a production plan. According to the function provided by the production plan evaluation unit 170b, the production plan is evaluated from the viewpoint of the inventory quantity, the operation status of the production facility, and the appropriateness of selection of the production facility. From the viewpoint of inventory quantity, a production plan that keeps the inventory quantity appropriate and does not cause a shortage is highly appreciated. From the viewpoint of the operation status of production facilities, production plans in which the production quantity of each production facility falls within an appropriate range are highly evaluated. From the viewpoint of the accuracy of selection of production facilities, production plans in which products and parts are produced using production facilities excellent in QCD are highly evaluated.

  The production plan search unit 170c provides a function of searching for a suitable production plan starting from the initial plan. The production plan search unit 170c includes configuration information 160, production means information 161, compatibility information 162, shipping schedule information 163, inventory information 164, inventory evaluation parameters 165, operational status evaluation parameters 166, QCD evaluation parameters 167, and constraint condition change parameters. 169, and the production plan is searched based on information provided from the initial plan creation unit 170a and the production plan evaluation unit 170b. Specifically, according to the function provided by the production plan search unit 170c, a suitable production plan is searched by the local search method as follows. First, the initial plan is the current production plan (hereinafter sometimes referred to as “current plan”). Then, the evaluation value of the current plan is compared with the evaluation value of the neighboring production plan in which a part of the current plan is changed. If the neighboring production plan is more highly evaluated, the neighboring production plan is regarded as the current plan. The Thus, the search is repeatedly executed until a predetermined end condition is satisfied.

  For example, a production plan in which the production quantity of a certain product or part on a certain day is increased or decreased by a certain number, a production plan in which the production date of a certain product or part is changed to another day, A production plan in which a product or part to be changed to another product or part or a production plan for a certain product on a certain day is changed to another production means is created.

  The production plan search unit 170c further changes at least one of the operating condition of the production facility and the shipping schedule information, which are the constraint conditions, when the production plan includes a missing item or a product or part whose shipment is delayed from the schedule. Explore the plan again. The production plan search unit 170c searches for the production plan by repeatedly calculating while adjusting the operation status of the production facility and the change rate of the shipping schedule information.

  Next, the production plan evaluation will be described in more detail. The evaluation value Ev of the production plan is calculated using the following formula (1).

  Here, Ps is an evaluation value from the viewpoint of inventory quantity. Ws is a weight for adjusting the evaluation value from the viewpoint of inventory quantity. Po is an evaluation value from the viewpoint of the operating status of the production facility. Wo is a weight for adjusting the evaluation value from the viewpoint of the operating status of the production facility. Pqcd is an evaluation value from the viewpoint of the appropriateness of selection of the production facility. Wqcd is a weight for adjusting the evaluation value from the viewpoint of the appropriateness of selection of the production facility. The production planning apparatus 10 is configured such that various parameters such as Ws, Wo, and Wqcd can be set to arbitrary values by the user.

  In this embodiment, each evaluation value is calculated as a penalty. That is, the smaller the evaluation value calculated, the higher the evaluation of the production plan. The method of calculating the evaluation value is not limited to such a method, and the evaluation value may be calculated such that the larger the evaluation value calculated, the higher the evaluation of the production plan.

  The evaluation of the production plan from the viewpoint of inventory quantity will be described with reference to FIGS. FIG. 9 is a diagram illustrating an example of a change in inventory quantity with time. FIG. 10 is a diagram illustrating an example of evaluation values when order accuracy is taken into consideration. FIG. 11 is a diagram illustrating an example of evaluation values when order accuracy is not taken into consideration.

  In FIG. 9, a curve C <b> 1 shows a change over time in the stock quantity when the order accuracy of a certain product or part is taken into consideration. The stock quantity when taking into account the order accuracy is calculated by adding the value obtained by subtracting the shipment quantity taking into account the order accuracy from the production quantity in the production plan, with the stock quantity at the start of the production plan as the initial value. Is done. The inventory quantity at the start of the production plan is acquired from the inventory information 164. The shipment quantity in consideration of the order accuracy is calculated by multiplying the value of the item of the current day's collection quantity stored in the shipping schedule information 163 by the value of the item of the order accuracy of the day.

  In FIG. 9, a curve C <b> 2 shows the change over time in the inventory quantity when the order accuracy of a certain product or part is not considered. The stock quantity without taking into account the accuracy of the order is calculated by accumulating a value obtained by subtracting the shipment quantity without taking the order accuracy into consideration from the production quantity in the production plan, with the stock quantity at the start of the production plan as the initial value. Is done. The shipment quantity that does not consider the order accuracy is the value itself of the collection quantity item of the day stored in the shipment schedule information 163.

  The inventory quantity at each time point indicated by the curve C1 is assumed to be close to the actual inventory quantity at that time point because the order accuracy is considered. For this reason, the inventory quantity indicated by the curve C1 is preferably close to the appropriate inventory quantity of the corresponding product or part. Therefore, the production plan is evaluated more highly as the difference between the stock quantity and the appropriate stock quantity in consideration of the order accuracy is small.

  On the other hand, the stock quantity at each time point indicated by the curve C2 does not take into account the order accuracy, so that the stock quantity at each time point when the shipment is performed according to the planned shipment quantity, that is, the minimum stock quantity at each time point can be taken. Indicates the value. For this reason, there is no possibility that a shortage will occur if the inventory quantity indicated by the curve C2 is 0 or more, regardless of the appropriate inventory quantity. Therefore, the production plan is highly evaluated if the inventory quantity when the order accuracy is not considered is 0 or more.

  As described above, the evaluation of the production plan from the viewpoint of the inventory quantity is performed using the inventory quantity when the order accuracy is considered and the inventory quantity when the accuracy is not considered. That is, the evaluation value Ps from the viewpoint of inventory quantity is calculated using the following equation (2).

  Here, Psp is an evaluation value based on the inventory quantity when the order accuracy is considered, and Psm is an evaluation value based on the inventory quantity when the accuracy is not considered. The evaluation value Ps is calculated for each product or part, and for each day on which production is performed within a target period for which a production plan is created. In the above equation (1), the evaluation values Ps calculated for each product or part and for each day are added together.

  The evaluation value Psp is calculated using, for example, the following formula (3).

  Here, qsp is an inventory quantity in consideration of the order accuracy. qr is a proper stock quantity. The appropriate inventory quantity is acquired from the inventory information 164.

  When the inventory quantity in consideration of the order accuracy is larger than the appropriate inventory quantity, the evaluation value Psp is calculated using the function fs1 (). As shown in FIG. 10, the function fs1 () is set so that the penalty increases as the excess quantity of inventory with qsp−qr, that is, the appropriate inventory quantity as a reference, increases.

  Even if there is a surplus in the stock, if the surplus is small, a large number of storage locations can be taken, but the problem is not great. Therefore, in the example shown in FIG. 10, the function fs1 () is a non-linear function in which the penalty remains relatively small when the surplus quantity is small. In addition, the more the shipment quantity (the more demand is), the smaller the size, or the lower the cost of the product or part, the fewer problems caused by the surplus in stock. Therefore, the function fs1 () may be set so that the penalty decreases as the shipment quantity increases (the demand increases), or the penalty decreases as the size decreases, and the cost decreases. It may be set so that the penalty becomes smaller as the value is lower.

  When the inventory quantity in consideration of the order accuracy is equal to the appropriate inventory quantity, the evaluation value Psp is 0, that is, a value indicating the highest evaluation.

  When the inventory quantity considering the order accuracy is smaller than the appropriate inventory quantity and 0 or more, the evaluation value Psp is calculated using the function fs2 (). As shown in FIG. 10, the function fs2 () is set so that the penalty becomes larger as qr−qsp, that is, the shortage quantity of inventory based on the appropriate inventory quantity increases.

  The fact that the inventory quantity is smaller than the appropriate inventory quantity means that there is a high possibility that a shortage will occur. The occurrence of missing items is a serious problem. Therefore, in the example shown in FIG. 10, the slope of the function fs2 () with respect to the fluctuation of the inventory quantity is larger than that of the function fs1 ().

  When the inventory quantity considering order accuracy is less than 0, that is, when a shortage occurs, the evaluation value Psp is calculated using the function fs3 (). As shown in FIG. 10, the function fs3 () is set so that the penalty increases as the quantity of missing parts increases as −qsp. The fact that there is actually a shortage is a very serious problem. Therefore, in the example illustrated in FIG. 10, the slope of the function fs3 () with respect to the fluctuation of the inventory quantity is larger than that of the function fs2 ().

  The evaluation value Psm is calculated using, for example, the following formula (4).

  Here, qsm is a stock quantity when the order accuracy is not considered.

  As described above, when the inventory quantity when the order accuracy is not considered is 0 or more, there is no shortage. For this reason, when the inventory quantity without considering the order accuracy is 0 or more, the evaluation value Psm is 0, that is, a value indicating the highest evaluation.

  When the inventory quantity when order accuracy is not taken into consideration is smaller than 0, that is, when there is a possibility that a shortage may occur, the evaluation value Psm is calculated using the function fs4 (). As shown in FIG. 11, the function fs4 () is set so that the penalty increases as the quantity of missing parts that can be generated is −qsm.

  Information relating to Expression (3) and Expression (4) may be stored in the inventory evaluation parameter 165, or may be embedded in the production plan evaluation unit 170b.

  Next, the evaluation of the production plan from the viewpoint of the operation status of the production facility will be described with reference to FIGS. 12 and 13. FIG. 12 is a diagram illustrating an example of the evaluation of the operation status of the production facility. FIG. 13 is a diagram illustrating an example in which the criteria for evaluating the operating status of a production facility change.

  The bar graph in FIG. 12 shows the change over time of the monthly total value of the production quantities of products or parts in a certain production facility. For the monthly aggregate value of the production quantity of products or parts, for example, the production date and production quantity of the product or part produced using the production facility to be aggregated is extracted from the production plan, and the production quantity is added monthly. It is calculated by doing. A plurality of types of products or parts may be mixed in products or parts produced using the production facility to be counted.

  The evaluation value Po from the viewpoint of the operating status of the production facility is calculated using, for example, the following equation (5).

  Here, qp is a monthly total value of the production quantities of products or parts in the production facility. qul is an upper limit value of an appropriate range of the production quantity of the product or part in the production facility. qll is an appropriate range lower limit value of the production quantity of the product or part in the production facility. The appropriate range upper limit value and the appropriate range lower limit value are acquired from the operation status evaluation parameter 166. The evaluation value Po is calculated for each production facility and for each month within a period for which a production plan is created. In the above equation (1), the evaluation value Po calculated for each production facility and for each month is added up.

  When the production quantity falls between the upper limit value and the lower limit value of the appropriate range, the operation status of the production facility is appropriate. For this reason, in this case, the evaluation value Po is 0, that is, a value indicating the highest evaluation.

  When the production quantity exceeds the appropriate range upper limit value, the evaluation value Po is calculated using the function fo1 (). As shown in FIG. 12, the function fo1 () is set so that the penalty increases as the excess quantity of the production quantity based on qp-qul, that is, the appropriate range upper limit value is larger. In the example shown in FIG. 12, the production quantity exceeds the appropriate range upper limit value in September 2012 and November 2012, but the excess quantity is larger in September 2012. Therefore, the penalty P3 of the production facility in September 2012 is larger than the penalty P2 of the production facility in November 2012.

  When the production quantity falls below the appropriate range lower limit value, the evaluation value Po is calculated using the function fo2 (). As shown in FIG. 12, the function fo2 () is set so that the penalty increases as the production quantity deficiency increases based on qll-qp, that is, the appropriate range lower limit value. In the example shown in FIG. 12, the production quantity falls below the appropriate range lower limit value in July 2012, and the penalty for the production facility in this month is the penalty P1.

  For example, the function fo1 () calculates Po by multiplying the excess quantity of the production quantity by the over-time evaluation coefficient of the facility stored in the operation status evaluation parameter 166. For example, the function fo2 () calculates Po by multiplying the shortage quantity of the production quantity by the under-evaluation coefficient of the facility stored in the operation status evaluation parameter 166.

  The production capacity of a production facility may fluctuate due to an increase in the number of equipment, an increase in the number of staff, etc. For example, in the example shown in FIG. 13, the production capacity of the production facility has been strengthened since January 2013, and the maximum production quantity and the appropriate range upper limit value are larger. Such a change in production capacity of the production facility can be dealt with by setting a period and setting a parameter for each period as in the example of the operation status evaluation parameter 166 shown in FIG. .

  The production plan planning device 10 may be configured to create a production plan so that the production quantity of each production facility does not exceed the maximum production quantity and does not fall below the minimum production quantity. In this case, for production quantities that exceed the maximum production quantity and production quantities that fall below the minimum production quantity, it is not necessary to calculate an evaluation value from the viewpoint of the operating status of the production facility.

  Next, the evaluation of the production plan from the viewpoint of the appropriateness of selection of the production facility will be described. The evaluation value Pqcd from the viewpoint of the appropriateness of selection of the production facility is calculated using, for example, the following formula (6).

  Here, Pq is an evaluation value related to the quality of products or parts produced at the production facility. Pq becomes smaller as the quality of products or parts produced in the production facility is higher. Pq is obtained, for example, by dividing the value of the quality item in the row corresponding to the production facility in the QCD evaluation parameter 167 from 100. The value of the quality item may vary depending on whether the product or part is newly produced or produced by modification. Wq is a weight for adjusting an evaluation value related to quality.

  Pc is an evaluation value related to the cost of the product or part produced at the production facility. Pc becomes smaller as the cost of products or parts produced in the production facility is lower. As the Pc, for example, the value of the cost item in the row corresponding to the production facility in the QCD evaluation parameter 167 is used as it is. The value of the cost item may vary depending on whether the product or part is newly produced or produced by modification. Wc is a weight for adjusting an evaluation value related to cost.

  Pd is an evaluation value related to the delivery date of the product or part produced at the production facility. Pd becomes so small that the delivery date of the product or part produced in the production facility is observed. Pd is obtained, for example, by dividing the value of the delivery date item of the line corresponding to the production facility in the QCD evaluation parameter 167 from 100. The value of the delivery date item may vary depending on whether the product or part is newly produced or produced by modification. Wd is a weight for adjusting the evaluation value related to the delivery date.

  The evaluation value Pqcd is calculated for each product or part and for each day on which production is performed within a target period for which a production plan is created. In the above equation (1), the evaluation values Pqcd calculated in this way for each product or part and for each day are added together.

  Next, if the production plan includes missing parts or products or parts that are later than scheduled, change the operating conditions of the production facility, which is a constraint, and / or shipping schedule information, and search for the production plan again Will be described.

  The control unit 15 executes the production plan planning program 170 and executes the function of the production plan search unit 170c, so that the production plan searched in the neighborhood solution search process based on the constraint condition set in the initial plan is missing. When a product or part whose shipment is delayed from the product or schedule is included, a process for searching for a production plan when the constraint condition is changed is performed.

  Specifically, based on the constraint condition change parameter 169, the production plan when the constraint condition is changed is searched by repeatedly performing the calculation while changing the constraint condition. Here, the evaluation function f (x) for the production plan x is calculated using the following equation (7), where the production plan x, demand information Θ, inventory quantity Φ, production capacity Ψ, and appropriate inventory level Ω are variables. The The demand information Θ is information on how many products are needed by what time, and can be calculated based on the shipping schedule information 163. The production capacity Ψ is the ability to produce each product and part, and can be calculated based on the production means information 161.

In the above formula (7), p (x, Ψ) is a production quantity exceeding the upper limit value of the production capacity, and varies depending on the production plan x and the production capacity Ψ, and q (x, Ψ) is a lower limit value of the production capacity. The production quantity is less than and varies depending on the production plan x and the production capacity Ψ. r (x, Θ, Φ) is the number of missing items (stock quantity less than 0), and varies depending on the production plan x, the demand information Θ, and the stock quantity Φ. s (x, Θ, Φ, Ω) is an inventory quantity exceeding an appropriate inventory level, and varies depending on the production plan x, the demand information Θ, the inventory quantity Φ, and the appropriate inventory level Ω. t (x, Θ, Φ, Ω) is an inventory quantity lower than the appropriate inventory level, and varies depending on the production plan x, the demand information Θ, the inventory quantity Φ, and the appropriate inventory level Ω. u (x) is the degree of adherence to the priority of the production place, and u (x) = u (w _uX01 × production quantity at location X01 + w _uX02 × production quantity at location X02 +...). W _* is a weighting factor that determines the priority of each constraint condition.

  On the other hand, the evaluation function g (ξ) when the constraint condition is changed is expressed by the following formula (8).

  F (x, Θ ′, Ψ ′, Φ, Ω) in Expression (8) is a function similar to that in Expression (7) described above. The demand information Θ ′ and the production capacity Ψ ′ are the changed demand information and the production capacity. d (Θ, Ψ, Θ ′, Ψ ′) is a function indicating the degree of change of the constraint condition, and is represented by the following formula (9).

Here, w _.THETA.i is changed easiness of the demand information theta _i. w _Ψi is the degree of _{changeability} of the production capacity Ψi. w _c is a weighting factor that determines the priority with other constraints. Α is a parameter (weighting coefficient) for adjusting which of the demand information and the production capacity should be changed. The weighting coefficient α is 0 ≦ α ≦ 1. Β _* is a parameter for adjusting whether many constraint conditions are changed little by little or a little constraint condition is changed greatly. In the case of 1 <β _* , the evaluation value is better if the many constraint conditions are changed little by little _{. In} the case of 0 <β _* ≦ 1, the evaluation value is better if the constraint condition is slightly changed.

  The control unit 15 repeatedly calculates while changing the constraint conditions, evaluates the produced production plan using the evaluation function of the above formula (8), and extracts a production plan with a good evaluation value, thereby A production plan that is highly evaluated when information and production capacity are adjusted is extracted. Here, in the expression (8), in addition to the evaluation of the production plan, the degree to which the constraint condition is changed is also evaluated. As a result, it is possible to extract a production plan with a high evaluation of the production plan and a small change in the constraint conditions.

  Next, the process procedure of the production plan planning process executed by the production plan planning apparatus 10 will be described with reference to FIGS. 14A to 29. FIG. 14A is a flowchart illustrating a processing procedure of a production plan planning process. The processing procedure illustrated in FIG. 14A is realized by the control unit 15 executing the production plan planning program 170.

  As shown in FIG. 14A, the control unit 15 first creates an initial plan (step S101). The control unit 15 sets the created initial plan as the current plan Pc and stores it in the production plan information 168 (step S102). The current plan Pc is the most preferable production plan searched at that time. Then, the control unit 15 calculates an evaluation value of the current plan Pc (Step S103).

  Subsequently, the control unit 15 creates a neighborhood solution Pn in which a part of the current plan Pc is changed by executing a neighborhood solution search process (step S104). Then, the control unit 15 calculates an evaluation value of the neighborhood solution Pn (step S105).

  When the evaluation value of the neighborhood solution Pn is smaller than the evaluation value of the current plan Pc, that is, when the neighborhood solution Pn has a higher evaluation than the current plan Pc (Yes in step S106), the control unit 15 sets the neighborhood solution Pn to the current value. The plan Pc is stored in the production plan information 168 (step S107). Then, the control unit 15 determines whether the end condition is satisfied (step S108).

  For example, the control unit 15 determines that the termination condition is satisfied in the following case. First, the control unit 15 evaluates all the production plans in the vicinity of the current plan Pc, but determines that the end condition is satisfied when there is no production plan with a higher evaluation than the current plan Pc. Further, the control unit 15 determines that the end condition is satisfied when the number of evaluations of the production plan is greater than the predetermined number. Further, the control unit 15 determines that the end condition is satisfied when the processing time of the production planning process becomes longer than a predetermined time. Further, the control unit 15 determines that the end condition is satisfied when the evaluation of the current plan Pc is sufficiently good, that is, when the evaluation value of the current plan Pc satisfies a predetermined condition. The predetermined condition is, for example, that the evaluation value is 0 or that the evaluation value is less than a sufficiently small threshold.

  If the evaluation value of the neighborhood solution Pn is greater than or equal to the evaluation value of the current plan Pc, that is, if the neighborhood solution Pn is not evaluated higher than the current plan Pc (step S106, No), the control unit 15 determines whether the end condition is satisfied. Is determined (step S108). When the end condition is not satisfied (No at Step S108), the control unit 15 re-executes Step S104 and the subsequent steps.

  When the end condition is satisfied (step S108, Yes), the control unit 15 determines whether the production quantity exceeds the upper limit of the production capacity (step S109). That is, the control unit 15 determines whether the production plan includes products and parts whose production quantity exceeds the upper limit of the production capacity. When the production quantity does not exceed the upper limit of the production capacity (No at Step S109), the control unit 15 determines whether a shortage occurs (Step S110). That is, the control unit 15 determines whether the production plan includes a product or a part that is out of date and does not meet the shipping schedule. When the production quantity exceeds the upper limit of the production capacity (step S109, Yes), or when a shortage occurs (step S110, Yes), the control unit 15 performs a condition conversion process (step S112), and produces The planning process is terminated. When there is no shortage (step S110, No), the control unit 15 sets the current plan Pc as the optimum solution (step S114), and ends the production plan planning process.

  FIG. 14B is a flowchart illustrating the processing procedure of the neighborhood solution search processing. The processing procedure illustrated in FIG. 14B is realized by the control unit 15 executing the production plan planning program 170.

  As illustrated in FIG. 14B, the control unit 15 first determines an object to be changed (step S201). The object to be determined is a combination of a date and a product or part. The target to be changed may be determined using a random number. Alternatively, a combination of a date with a maximum penalty and a product or a part may be determined as a target to be changed so that a suitable solution is searched early.

  Subsequently, the control unit 15 determines a target change method (step S202). In the present embodiment, as a method for changing the object, any one of a change in production quantity, a change in production time, a change in articles, and a change in production means can be selected. The method for changing the target may be determined using a random number. Alternatively, each time the target to be changed changes, the target changing method may be selected in a predetermined order.

  As for the change of the production quantity, there is a method of exchanging the production time between two target products or parts, as in the example shown in FIG. Further, the production quantity can be changed by increasing the quantity in which the target product or part is produced on the target day as shown in FIG. 16 or on the target day as shown in FIG. A way to reduce the quantity of products or parts produced. The change in the production quantity affects the evaluation value from the viewpoint of the inventory quantity and the evaluation value from the viewpoint of the operation status of the production facility. If a change in production quantity is selected, the number of changes in production quantity is also determined. The increase / decrease number of the production quantity may always be 1 or -1. The increase / decrease number of the production quantity may be determined using a random number within a predetermined range.

  In the current plan Pc, when there is no plan to produce the target product or part on the target day, the production means used for production is also determined. In this case, the change in the production quantity also affects the evaluation value from the viewpoint of the appropriateness of selection of the production facility.

  The change of the production time is a method of changing the time when the target product or part is produced as in the example shown in FIG. The change of the production time affects the evaluation value from the viewpoint of the inventory quantity and the evaluation value from the viewpoint of the operation status of the production facility.

  The change of the article is a method of changing the product or part produced on the target day, as in the example shown in FIG. The article may be changed so that the production means used for producing the product or part does not change. In this case, the change of the article affects the evaluation value from the viewpoint of inventory quantity. Alternatively, the change of the article may include a change in which the production means used to produce the product or part changes. In this case, the change of the article affects the evaluation value from the viewpoint of the inventory quantity, the evaluation value from the viewpoint of the operation status of the production facility, and the evaluation value from the viewpoint of the appropriateness of the selection of the production facility.

  The change of the production means is a method of changing the production means for producing a product or part produced on the target day, as in the example shown in FIG. The change of production means includes a change of switching between new production or production by remodeling while using the same production facility. The change of the production means affects the evaluation value from the viewpoint of the operation status of the production facility and the evaluation value from the viewpoint of the appropriateness of selection of the production facility.

  The method for changing the object is selected within a feasible range. For example, a change that causes a product or part that cannot be produced by modification to be produced by modification is not selected. If there is no inventory of the product or part to be modified, the change that causes the product or part to be produced by the modification is not selected. Changes that violate the maximum and minimum production volume constraints of the production facility are not selected. Changes that would duplicate use of production facilities already assigned to produce other products or parts are not selected.

  The production planning device 10 can produce the product or part after the change so that the product or part after the change can be produced in accordance with the change of the production quantity of the product or part, the change of the production time, or the change of the article. May be configured to change.

  When the change of the production quantity is determined as the change method (step S203, Yes), the control unit 15 determines the quantity to be changed (step S204). Subsequently, the control unit 15 changes the target production quantity in the current plan Pc by the determined quantity (step S205). And the control part 15 makes the production plan after a change the neighborhood solution Pn (step S214).

  When the change of the production time is determined as the change method (No at Step S203, Step S206, Yes), the control unit 15 determines the time after the change (Step S207). Subsequently, the control unit 15 changes the target production time in the current plan Pc to the determined time (step S208). And the control part 15 makes the production plan after a change the neighborhood solution Pn (step S214).

  When the change of the article is determined as the change method (step S206, No, step S209, Yes), the control unit 15 determines the changed product or part (step S210). Subsequently, the control unit 15 changes the current plan Pc so as to produce the determined product or part instead of the target product or part (step S211). And the control part 15 makes the production plan after a change the neighborhood solution Pn (step S214).

  If the change method is other than the above, that is, if the change of the production means is determined (No at Step S209), the control unit 15 determines the changed production means (Step S212). Subsequently, the control unit 15 changes the target production means in the current plan Pc to the determined production means (step S213). And the control part 15 makes the production plan after a change the neighborhood solution Pn (step S214).

  Next, an example of a production plan to be created will be described. FIG. 21 is a diagram illustrating an example of production plan information 168 in which an initial plan is stored. FIG. 22 is a diagram showing an example of production plan information 168 in which a searched suitable production plan is stored.

  Compared to the example shown in FIG. 21, in the example shown in FIG. 22, the production means on April 2 of the product identified by the product number “A01” is changed from new production to production by remodeling, and the production quantity Has decreased from 10 to 5. Further, as a result of this change, the stock quantity of the product identified by the product number “A02” is reduced by 5 because it is used for remodeling.

  In the initial plan, the product identified by the product number “A01” has an excessive inventory quantity, but due to this change, the inventory quantity is close to an appropriate quantity. Similarly, in the initial plan, the product identified by the product number “A02” has an excessive inventory quantity, but this change brings the inventory quantity close to an appropriate quantity. With these changes, the evaluation value from the viewpoint of inventory quantity has improved.

  In this embodiment, it is assumed that the cost of production by remodeling is lower than that of new production. For this reason, by changing the production means of the product identified by the product number “A01” from new production to production by remodeling, the evaluation value from the viewpoint of the appropriateness of selection of the production facility is improved.

  FIG. 23 is a diagram illustrating an example of production plan information in which a production plan for a part to be produced is stored. FIG. 24 is a diagram illustrating an example of changing a production plan. In the above embodiment, an example of a production plan for a product has been described. However, the same applies to a production plan for parts. First, production plan information 200 shown in FIG. 23 is generated as an initial plan. The production plan information 200 includes one order and one unit of work, and each row includes parts, production place, warehousing place (shipping place), production quantity, production start time (start time), production completion time ( Information including end time) is associated.

  In the production plan information 200, when the neighborhood solution search processing is performed with the row 201 as an adjustment target, the production quantity is changed from 100 to 200, and the row 201a is obtained. When the production quantity is changed from 100 to 0, a row 201b is obtained. If the production start time and the production end time are advanced, the line 201c is obtained. If the production start time and the production end time are delayed, the line 201d is obtained. If the production place is changed, the line 201e is obtained. In addition, the object of a change is not limited to this, A several item may be changed and another line may be changed. The control unit 15 changes each item of each line of the production plan information 200, calculates an evaluation value with an evaluation function for each plan, and extracts a production plan.

  Next, the condition changing process will be described with reference to FIGS. FIG. 25 is a flowchart showing the processing procedure of the condition changing process. The processing procedure shown in FIG. 25 is realized by the control unit 15 executing the production planning program 170.

  As shown in FIG. 25, the control unit 15 sets the weighting coefficient α to 0 (step S301). Next, the control unit 15 extracts the current production plan, demand information, and production capacity information (step S302). Next, the control unit 15 changes at least one of demand information and production capacity (step S303).

  FIG. 26 is a diagram illustrating an example of production capacity. FIG. 27 is a diagram illustrating an example of a change in production capacity. First, as the production capacity set as the initial constraint condition, there is production capacity information 230 shown in FIG. In the production capacity information 230, one unit of work is one line, and each line includes information including a part, a production location, a production quantity (upper limit of production capacity), and a production quantity (lower limit of production capacity). It is associated.

  In the production capacity information 230, the line 231 is changed, and when the production possible quantity is changed (increased) from 500 to 510, the line 231a is obtained. When the required production quantity is changed (decreased) from 100 to 80, the line 231b is obtained. Further, when the number of parts to be produced is increased based on the compatibility information 162, a row 231c is obtained. Further, when the number of parts to be produced is reduced, the line 231d is obtained. In addition, the object of a change is not limited to this, A some item may be changed and another line may be changed. The control unit 15 changes each item in each line of the production capacity information 230.

  FIG. 28 is a diagram illustrating an example of demand information. FIG. 29 is a diagram illustrating an example of changing demand information. First, as demand information set as an initial constraint condition, there is demand information 250 shown in FIG. The demand information 250 includes one order (order) in one line, and each line is associated with information including parts, shipping location, order status, required quantity, and required time (delivery date).

  In the demand information 250, if the line 251 is changed and the necessary time is delayed, the line 251a is obtained. If the necessary time is advanced, it becomes row 251b. Further, when a part to be delivered is changed based on the compatibility information 162, a line 231c is obtained. In addition, the object of a change is not limited to this, A some item may be changed and another line may be changed. The control unit 15 changes each item in each line of the demand information 250.

  As shown in FIGS. 26 to 29, the control unit 15 changes the items of production capacity and demand information set as the constraint conditions. When at least one of the demand information and the production capacity is changed, the control unit 15 calculates an evaluation value of the current plan (step S304). Subsequently, the control unit 15 creates a neighborhood solution by changing a part of the current plan by executing a neighborhood solution search process (step S305). And the control part 15 calculates the evaluation value of a neighborhood solution (step S306). The evaluation value of the neighborhood solution is calculated using Equation (8).

  When the evaluation value of the neighborhood solution is smaller than the evaluation value of the current plan, that is, when the neighborhood solution has a higher evaluation than the current plan (step S307, Yes), the control unit 15 sets the neighborhood solution as the current plan, and produces the production plan. The information is stored in the information 168 (step S308). And the control part 15 determines whether completion | finish conditions were satisfied (step S309). For example, the control unit 15 determines that the termination condition is satisfied in the following case. The end condition is determined by the same determination as in step S108.

  When the evaluation value of the neighborhood solution is equal to or higher than the evaluation value of the current plan, that is, when the neighborhood solution is not higher in evaluation than the current plan (step S307, No), the control unit 15 determines whether the end condition is satisfied ( Step S309). If the end condition is not satisfied (No at Step S309), the control unit 15 re-executes Step S305 and the subsequent steps.

  When the end condition is satisfied (step S309, Yes), the control unit 15 determines whether the processing of the current weighting coefficient is ended. Specifically, based on the current α, it is determined whether there is a target for which the production information is evaluated by changing the demand information and the production capacity. When the processing of the current weighting coefficient has not been completed (No at Step S310), the control unit 15 re-executes the processing after Step S303. Thereby, the neighborhood solution of a production plan can be determined and evaluated about a change pattern of demand information and production capacity of a necessary combination.

  When the processing of the current weighting coefficient is completed (step S310, Yes), the control unit 15 updates the weighting coefficient α (step S311). Specifically, a constant value dα is added to α (α = α + dα). Thereafter, the control unit 15 determines whether α ≦ 1 is satisfied (step S312). When α ≦ 1 is satisfied (step S312, Yes), the control unit 15 re-executes the processing after step S303. Thereby, it is possible to repeatedly perform calculation with a new α, and it is possible to evaluate the production plan calculated in each case where α is in the range of 0 to 1.

  If α ≦ 1 is not satisfied (step S312, No), the control unit 15 extracts a plan (production plan) that satisfies the condition from the calculation result and outputs it (step S313), and ends the condition change process of the production plan planning process. Let Here, as a condition for extracting a production plan, there is an evaluation value, and a production plan whose evaluation value is better than a threshold value is extracted.

  In this way, the production planning device 10 searches for a production plan in which the demand information and the production capacity are changed when work that exceeds the shortage or the production capacity occurs while maintaining the demand information and the production capacity. By evaluating based on the evaluation function and extracting the production plan based on the result, it is possible to extract an appropriate production plan when the demand information and the production capacity are changed. As a result, the user changes demand information (delivery part, product type, part, product delivery date) and production capacity (for example, upper limit of production capacity, produced part, product type) and analyzes again. The production plan to be employed can be determined based on the extracted production plan.

  Further, the production plan planning device 10 can output a plurality of production plans by extracting a production plan that satisfies the conditions. Thereby, the user can perform an actual operation based on the production plan that is changed with a high possibility of being realized from the extracted production plans. In addition, the production planning apparatus 10 satisfies the conditions while adding a parameter for evaluating the magnitude of the constraint condition change to the evaluation function, while reducing the constraint condition change (there is no shortage or delivery delay) (Low) production plans can be extracted.

  In addition, the production planning apparatus 10 performs the evaluation while changing the weighting between the production capacity and the demand information, and thereby performs the production when the distribution that emphasizes the adjustment of the production capacity and the adjustment of the demand information is variously performed. Plans can be considered. Thereby, a production plan can be extracted from the result of examining more production plans. Further, by using a parameter that adjusts the evaluation according to the state of change, such as β in the above formula (8), the user can also adjust the directionality of the allowable constraint condition.

  As described above, the production plan planning apparatus 10 according to the present embodiment can evaluate a production plan from various viewpoints and draft a suitable production plan.

  In addition, the aspect of this invention shown by said Example can be arbitrarily changed in the range which does not deviate from the summary of this invention. For example, the program shown in the above embodiment may be divided into a plurality of modules or may be integrated with other programs. In the above embodiment, the local search method is used to search for a suitable production plan. However, a suitable production plan may be searched using other solution search methods.

  In the above-described embodiment, the example in which the evaluation value is calculated so as to indicate that the smaller the value is, the better the production plan is. An evaluation value may be calculated so as to indicate that there is.

  In the above embodiment, the change in the number of inventory is managed every day and the change in the production quantity is managed every month. However, the unit of time for managing the change in the number of inventory and the production quantity is the situation. It may be arbitrarily changed according to the purpose.

  In the above-described embodiment, an example in which a product and a part are evaluated using the same parameter has been described. However, different parameters may be used for the product and the part.

DESCRIPTION OF SYMBOLS 10 Production planning apparatus 11 Display part 12 Input part 13 Communication part 14 Medium reading part 15 Control part 16 Storage part 20 Production management system 151 CPU
152 Memory 160 Configuration Information 161 Production Means Information 162 Compatibility Information 163 Shipment Schedule Information 164 Inventory Information 165 Inventory Evaluation Parameter 166 Operation Status Evaluation Parameter 167 QCD Evaluation Parameter 168 Production Plan Information 170 Production Plan Planning Program 170a Initial Plan Creation Unit 170b Production Plan Evaluation unit 170c Production plan search unit

Claims (8)

A first evaluation value relating to an inventory quantity of the product and parts constituting the product, the production plan being calculated based on the production plan and shipment schedule information storing a shipment schedule of the product; and the production plan Production evaluated based on the second evaluation value related to the operation status of the production facility for producing the product and the part calculated based on the above and the third evaluation value related to the accuracy of selection of the production facility A plan evaluation department;
Based on the evaluation result of the production plan evaluation unit and the weighting factor for adjusting the first evaluation value, the second evaluation value, and the third evaluation value , the current production plan, and the current The production quantity in the production plan, the production period, the production item, and the production plan in the vicinity where at least a part of the production means is changed are compared, the constraint condition of the production capacity included in the operation status of the production facility, and the shipment schedule information A production plan search unit for executing a neighborhood solution search process for searching for a suitable production plan under the constraint condition of the demand information included in
With
The production plan search unit, as a result of executing the neighborhood solution search process, without changing the constraint condition of the production capacity included in the operation status of the production facility and the constraint condition of the demand information included in the shipping schedule information When a shortage occurs in the searched production plan or when the shipment schedule is later than the shipment schedule information, change at least one of the constraint conditions of the production capacity and the constraint condition of the demand information , and give priority to the respective constraint conditions Based on a fourth evaluation value calculated from an evaluation function including a weighting factor for determining the rank and the degree of change of the constraint condition, a constraint condition change process for searching for a suitable production plan is executed again. Production planning equipment. The production plan search unit is a change for adjusting which change of the constraint condition of the production capacity included in the operation status of the production facility and the constraint condition of the demand information included in the shipping schedule information is more permitted The weighting coefficient is calculated, the weighting coefficient is changed within a predetermined range, and the calculation is repeated by calculating the fourth evaluation value based on the evaluation function for each weighting coefficient . The production planning apparatus according to claim 1, wherein evaluation is performed .   The production plan planning device according to claim 1, wherein the production plan search unit sets a production plan with a small change in the operation status of the production facility and the shipping schedule information as a search result.   The said production plan search part makes the said some production plan the production plan of a search result, The production plan planning apparatus as described in any one of Claim 1 to 3 characterized by the above-mentioned.   5. The production planning apparatus according to claim 1, wherein the operation status of the production facility includes at least one of an upper limit of production capacity, a production location, and a production part.   The production plan evaluation unit evaluates the production plan higher as the inventory quantity calculated in consideration of the accuracy of order receipt is closer to the appropriate inventory quantity set for each of the product and the part. The production planning apparatus according to any one of claims 1 to 5. A production planning method executed by a production planning device,
A first evaluation value relating to an inventory quantity of the product and parts constituting the product, the production plan being calculated based on the production plan and shipment schedule information storing a shipment schedule of the product; and the production plan A step of evaluating based on a second evaluation value relating to the operating status of the production facility for producing the product and the part calculated based on the above and a third evaluation value relating to the accuracy of selection of the production facility When,
Based on a result of evaluating the production plan and a weighting factor for adjusting the first evaluation value, the second evaluation value, and the third evaluation value, the current production plan and the current production plan Production quantity, production time, production article, and production plan in the vicinity of which at least a part of the production means has been changed, and included in the production capacity constraint condition and the shipping schedule information included in the operation status of the production facility Executing a neighborhood solution search process for searching for a suitable production plan under the constraints of demand information
As a result of executing the neighborhood solution search process, the production plan that is searched without changing the constraint condition of the production capacity included in the operation status of the production facility and the constraint condition of the demand information included in the shipping schedule information is missing. Or when the shipment schedule is later than the shipment schedule information , the weight for determining the priority of each constraint condition by changing at least one of the constraint condition of the production capacity and the constraint condition of the demand information Executing a constraint condition change process for searching for a suitable production plan again based on a fourth evaluation value calculated from an evaluation function including a coefficient and a degree of change of the constraint condition ;
A production planning method characterized by comprising: In production planning equipment,
A first evaluation value relating to an inventory quantity of the product and parts constituting the product, the production plan being calculated based on the production plan and shipment schedule information storing a shipment schedule of the product; and the production plan A step of evaluating based on a second evaluation value relating to the operating status of the production facility for producing the product and the part calculated based on the above and a third evaluation value relating to the accuracy of selection of the production facility When,
Based on a result of evaluating the production plan and a weighting factor for adjusting the first evaluation value, the second evaluation value, and the third evaluation value, the current production plan and the current production plan Production quantity, production time, production article, and production plan in the vicinity of which at least a part of the production means has been changed, and included in the production capacity constraint condition and the shipping schedule information included in the operation status of the production facility Executing a neighborhood solution search process for searching for a suitable production plan under the constraints of demand information
As a result of executing the neighborhood solution search process, the production plan that is searched without changing the constraint condition of the production capacity included in the operation status of the production facility and the constraint condition of the demand information included in the shipping schedule information is missing. Or when the shipment schedule is later than the shipment schedule information , the weight for determining the priority of each constraint condition by changing at least one of the constraint condition of the production capacity and the constraint condition of the demand information Executing a constraint condition change process for searching for a suitable production plan again based on a fourth evaluation value calculated from an evaluation function including a coefficient and a degree of change of the constraint condition ;
A production planning program characterized in that

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