JP2021009435A - Production plan formulation device, production plan formulation program, and production plan formulation method - Google Patents

Abstract

To formulate a better production plan.SOLUTION: A production plan formulation device 100 includes: a processing sequence processing unit 110 that acquires a processing sequence which is the sequence of processing operations for performing a plurality of processing operations on a material to obtain a product having a predetermined shape, and is able to change the processing sequence; a calculation unit 120 that calculates a processing time, which is the time required for each processing operation based on the processing sequence; a production planning unit 130 that generates production plans when multiple products are produced based on each processing sequence using multiple processing devices; and an extraction unit 140 that extracts a production plan that meets the target conditions from multiple production plans obtained based on multiple types of processing sequences.SELECTED DRAWING: Figure 1

Description

The present invention relates to a production plan formulation device for generating a production plan when a plurality of products are produced by using a plurality of processing devices, a production plan formulation program, and a production plan formulation method.

Conventionally, in machining by an NC machining apparatus, it is necessary to create an NC program to be instructed in advance, and CAM software is used to create the NC program. The existing CAM software requires a lot of work such as setting the machining area, instructing the machining order, and setting the machining conditions. Therefore, a technique for automatically deriving the order of processing operations has been proposed, as in the technique described in Patent Document 1.

Further, as in the technique described in Patent Document 2, a technique is proposed in which a production plan for automatically formulating a production plan for producing a plurality of products by sharing the machining work with a plurality of machining devices based on a predetermined processing sequence is proposed. Has been done.

JP-A-2017-217735 Japanese Unexamined Patent Publication No. 2013-084035

However, when a production plan for producing a plurality of products by a plurality of processing devices is formulated based on the order of processing operations determined for a single product, an appropriate production plan cannot always be obtained. The inventor has come to find.

The present invention has been made based on the knowledge of the inventor, and is a production plan formulation device and a production plan formulation program capable of formulating an optimum production plan when producing a plurality of products using a plurality of processing devices. , And the purpose of providing a production planning method.

In order to achieve the above object, the production planning apparatus, which is one of the present inventions, performs a plurality of processing operations on a material to obtain a processing order in which a product having a predetermined shape is obtained. Using a machining order processing unit that can acquire and change the machining order, a time calculation unit that calculates the machining time, which is the time required for each machining operation based on the obtained machining order, and a plurality of machining devices. , A production planning unit that generates a production plan when a plurality of the products are produced based on the processing order, and an extraction that extracts a production plan that satisfies a target condition from a plurality of production plans obtained based on a plurality of types of processing orders. It has a part and.

Further, in order to achieve the above object, the production planning program, which is another one of the present invention, performs a plurality of processing operations on the material in the order of processing operations for obtaining a product having a predetermined shape. A machining order processing unit that can acquire a certain machining order and change the machining order, a time calculation section that calculates the machining time that is the time required for each machining operation based on the obtained machining order, and a plurality of units. A production planning unit that generates a production plan when a plurality of the products are produced based on the processing order using a processing device, and a production plan that satisfies a target condition from a plurality of production plans obtained based on a plurality of types of processing orders. It is provided with an extraction unit for extracting.

Further, in order to achieve the above object, another production planning method of the present invention is to perform a plurality of processing operations on a material in the order of processing operations for obtaining a product having a predetermined shape. The machining order processing unit acquires a certain machining order, the machining order processing section changes, and the time calculation section calculates the machining time required for each machining operation based on the obtained machining order, and a plurality of machines are used. The production planning department generates a production plan for producing a plurality of the products based on the processing order using a processing device, and a production plan satisfying a target condition from a plurality of production plans obtained based on a plurality of types of processing orders. Is extracted by the extraction unit.

According to the present invention, it is possible to formulate a more appropriate production plan based on the order of processing operations suitable for sharing the processing operations by a plurality of processing devices.

It is a block diagram which shows the functional structure of the production planning apparatus. It is a perspective view which shows the material, the product, and each removal area in one processing sequence. It is a figure which shows the sequence tree created by a process design system. It is a figure which shows the processing order of one selected from the order tree. It is a figure which shows the other processing order selected from the order tree, and is the figure which shows the processing order which exchanged the upper layer and the lower layer in the order tree. It is a perspective view which shows each removal area by another processing order shown in FIG. It is a figure which shows the production plan created by the production planning department.

Hereinafter, embodiments of the production planning apparatus, the production planning program, and the production planning method according to the present invention will be described with reference to the drawings. The numerical values, shapes, materials, components, positional relationships of the components, connection states, steps, the order of steps, etc. shown in the following embodiments are examples, and are not intended to limit the present invention. In the following, a plurality of inventions may be described as one embodiment, but components not described in the claims will be described as arbitrary components with respect to the invention according to the claims. ing. In addition, the drawings are schematic views in which emphasis, omission, and ratio are adjusted as appropriate to explain the present invention, and may differ from the actual shape, positional relationship, and ratio.

FIG. 1 is a block diagram showing a functional configuration of a production planning apparatus. FIG. 2 is a perspective view showing a material, a product, and a removal area. The production plan formulation device 100 is an apparatus for formulating a production plan for producing a plurality of products by allocating and executing a processing operation for removing a part of a material 200 made of metal, resin, or the like to a plurality of processing devices. It is a device realized by having a computer execute software (program). Further, the production plan formulation device 100 acquires information from a process design system 301 such as CAM (computer aided manufacturing), and formulates a production plan based on the acquired information. A computer is an electronic computer including a CPU (central processing unit) and having a general configuration such as input / output means such as a display device and an input device, and storage means such as a memory and an external storage device. As shown in FIG. 1, the production planning apparatus 100 includes a machining sequence processing unit 110, a time calculation unit 120, a production planning unit 130, and an extraction unit 140.

The process design system 301 geometrically constrains the possibility of the order of processing operations for removing the removal region 202 based on the shape of the material 200 created by CAD (Computer Aided Design) or the like and the shape of the product 201. The order tree 400 shown in FIG. 3 represented by a hierarchical structure is created.

Specifically, for example, the process design system 301 is a geometric constraint required based on the fact that in actual machining, the tool can approach only the removal region having the open surface portion which is the surface in contact with the atmosphere. The order tree 400 is created according to the conditions. In the shape of the product 201 shown in FIG. 2, the removal regions that can be machined from the shape of the first material 200 are the first removal region 210, the second removal region 220, and the third removal region 230 that can come into contact with the tool. Limited. The fourth removal area 211 and the fifth removal area 212 can be processed when the first removal area 210 is removed by processing. Similarly, the sixth removal area 221 and the seventh removal area 222 have the second removal area 220. When removed by processing, processing becomes possible. Considering the geometrical constraints of whether or not the tool can be approached in this way, it is possible to create an order tree 400 represented by a hierarchical structure as shown in FIG.

Further, the process design system 301 can also determine the order of machining operations based on the order tree 400 and based on conditions such as less replacement of machining tools.

The processing sequence processing unit 110 acquires a processing order, which is the order of processing operations for obtaining a product having a predetermined shape by performing a plurality of processing operations on the material 200 from the process design system 301. In addition, the machining order processing unit 110 can change the acquired machining order.

Specifically, for example, the machining sequence processing unit 110 acquires one machining sequence as shown in FIG. 4 from the process design system 301. Further, as shown in FIG. 5, the machining order processing unit 110 changes the machining order beyond the hierarchy of the sequence tree 400. When the machining order processing unit 110 changes the machining order, as shown in FIG. 6, the fourth removal region 211 and the fifth removal region 212 are processed before the first removal region 210. The volume of the removal area increases as compared with the case of the processing order shown in. On the other hand, the volume of the first removal region 210 decreases.

In the case of the present embodiment, the machining sequence processing unit 110 performs the machining operation directly above the removal area in the lower hierarchy in the sequence tree 400 or before the removal area in the higher hierarchy. Implement the changes in. Further, the change is not limited to one time, and the change may be carried out a plurality of times.

The time calculation unit 120 calculates the processing time, which is the time required for each processing operation, based on each of the plurality of processing orders obtained by the processing order processing unit 110. For example, the volume of the fourth removal region 211 in the order shown in FIG. 5 is larger than the volume of the fourth removal region 211 in the order shown in FIG. 4, and the processing amount is larger. Therefore, the volume is calculated based on the same processing apparatus. The processing time to be processed becomes long. A processing device in which the production planning unit 130 described later removes the fourth removal area 211 in the order shown in FIG. 5 and a processing device in which the production planning unit 130 described later removes the fourth removal area 211 in the order shown in FIG. If the above is different, the time calculation unit 120 may calculate the processing time of each processing operation based on the capacity of each processing apparatus.

The production planning unit 130 uses a plurality of processing devices to generate production plans for producing a plurality of products 201 based on a plurality of processing orders obtained by the processing sequence processing unit 110. The production planning unit 130 generates a production plan based on the processing time calculated by the time calculation unit 120.

The logic executed by the production planning unit 130 is not particularly limited, and a well-known method such as job shop scheduling can be used. In particular, by adopting distributed job shop scheduling by the recursive propagation method, it is possible to appropriately reflect the change in time due to the change of machining order.

Specifically, for example, for all the products 201, the production planning unit 130 is based on the order shown in FIG. 4, that is, the condition that the fourth removal region 211 and the fifth removal region 212 are processed after the first removal region 210. The first production plan as shown in FIG. 7 is generated. In FIG. 7, the width of the rectangle indicates the time required for the processing work. The rectangular portion with a blank inside indicates the setup change time in the processing apparatus. The formulated production plan is as follows. In the first removal area 210 and the second removal area 220, the A processing apparatus executes the processing work, and in the fourth removal area 211 and the fifth removal area 212, the B processing apparatus executes the processing work. In this case, the machining work of the fourth removal region 211 and the fifth removal region 212 is executed after the machining work of the first removal region 210 of the last product (second product in FIG. 7) is completed, so that the total production time Is T1.

In addition, the production planning unit 130 generates a second production plan for some products 201 or all products 201 based on a processing order different from the previous one. For the second product, the production planning unit 130 is based on the order shown in FIG. 5, that is, the processing work is executed first in the fourth removal area 211 and the fifth removal area 212 before the first removal area 210. , Formulate a second production plan. The formulated production plan is that while the processing work of the second removal area 220 and the first removal area 210 of the first product is being executed in the A processing device, the fourth removal area 211 of the second product in the B processing device. , It is planned to carry out the processing work of the fifth removal area 212. In this case, as shown in FIG. 6, the fourth removal area 211 and the fifth removal area 212 of the second product have a larger processing volume than in the case of the first production plan, so that the processing time is relatively long. Since the processing time is shorter than the processing time of the second removal area 220 and the first removal area 210 in the A processing apparatus in which the processing work is executed at the same time, the production planning unit 130 allows the second production plan. As a result, the total production time according to the second production plan is T2.

As described above, the production planning unit 130 generates a plurality of production plans based on the changed machining order and the calculated machining time.

The extraction unit 140 extracts a production plan satisfying the target condition from a plurality of production plans formulated by the production planning unit 130 based on a plurality of types of processing sequences. The target conditions are not particularly limited, but for example, the total production time, which is the time to produce all the products 201, is equal to or less than the first threshold value, and the operating rate of the processing equipment is equal to or more than the second threshold value. is there. In addition to the total production time and machine operating rate, the target conditions are that the residence time (time required to manufacture one product 201) is less than or equal to the third threshold value, and the waiting time (processing for the product is performed). The unbroken time) may be less than or equal to the fourth threshold.

For example, if the target condition is the shortest total production time, which is the time to produce all the products 201, the extraction unit 140 has a production plan in which the total production time is shorter than the total production time T2 in the second production plan. The second production plan is extracted unless is formulated. The extraction unit 140 may extract a plurality of production plans depending on the target conditions.

As shown in the above-described embodiment, according to the production plan formulation device 100, a plurality of production plans can be flexibly created by changing the order of processing work of at least one product 201 out of a plurality of products 201 to be produced. It becomes possible to formulate and extract a production plan that meets the target conditions. Specifically, even if the processing order seems to be inefficient in the processing of a single product, a better production plan is formulated by adopting a processing order that increases productivity when the overall production plan is taken into consideration. can do.

In addition, in order to formulate a production plan in consideration of the change in the volume of the machining area due to the replacement of the upper hierarchy and the lower hierarchy in the sequence tree 400 and the capacity of the machining apparatus that executes machining, the production plan is formulated with high accuracy. be able to.

The present invention is not limited to the above embodiment. For example, an embodiment of the present invention may be an embodiment of the present invention realized by arbitrarily combining the components described in the present specification and excluding some of the components. The present invention also includes modifications obtained by making various modifications that can be conceived by those skilled in the art within the scope of the gist of the present invention, that is, the meaning indicated by the words described in the claims. Is done.

For example, the target condition may be plural, and the extraction unit 140 may extract a production plan that matches the plurality of target conditions.

Further, in the above-described embodiment, the case where the production plan is formulated on the assumption of end milling using a milling machine has been described, but the present invention is not limited to this. For example, some or all of the processing equipment may be lathes. Further, the machining apparatus may be a single-function machining apparatus not equipped with an automatic tool changer, but may be a high-performance machining apparatus equipped with an automatic tool changer. It may be a combination.

Further, although the production plan formulation device 100 and the process design system 301 have been described as separate bodies, the process design system 301 may be incorporated in the production plan formulation device 100.

The present invention can be used for formulating a production plan when manufacturing a plurality of products using a plurality of NC processing machines or the like.

100 Production planning device 110 Processing sequence processing unit 120 Time calculation unit 130 Production planning unit 140 Extraction unit 200 Material 201 Product 202 Removal area 210 First removal area 211 Fourth removal area 212 Fifth removal area 220 Second removal area 221 First (6) Removal area 222 7th removal area 230 3rd removal area 301 Process design system 400 Sequence tree

Claims (6)

A machining order processing unit that can acquire a machining order, which is the sequence of machining operations for performing a plurality of machining operations on a material to obtain a product having a predetermined shape, and change the machining order.
A time calculation unit that calculates the machining time, which is the time required for each machining operation, based on the obtained machining order.
A production planning unit that generates a production plan when a plurality of the products are produced based on the processing order using a plurality of processing devices.
An extraction unit that extracts production plans that meet the target conditions from multiple production plans obtained based on multiple types of processing orders,
Production planning equipment equipped with. The production planning apparatus according to claim 1, wherein the target condition is a total production time equal to or less than a first threshold value, which is a time for producing a plurality of products. The target condition is the production planning apparatus according to claim 1, wherein the operating rate of the processing apparatus is equal to or higher than the second threshold value. The time calculation unit
The production planning apparatus according to any one of claims 1 to 3, which calculates the processing time of each processing operation allocated by the production planning unit based on the capacity of the processing apparatus. A machining order processing unit that can acquire a machining order, which is the sequence of machining operations for performing a plurality of machining operations on a material to obtain a product having a predetermined shape, and change the machining order.
A time calculation unit that calculates the machining time, which is the time required for each machining operation, based on the obtained machining order.
A production planning unit that generates a production plan when a plurality of the products are produced based on the processing order using a plurality of processing devices.
An extraction unit that extracts production plans that meet the target conditions from multiple production plans obtained based on multiple types of processing orders,
Production planning program with. The processing order processing unit acquires the processing order, which is the order of the processing operations for performing a plurality of processing operations on the material to obtain a product having a predetermined shape, and the processing order processing unit changes the processing order.
Based on the obtained processing order, the time calculation unit calculates the processing time, which is the time required for each processing operation.
The production planning department generates a production plan when a plurality of the products are produced based on the processing order using a plurality of processing devices.
A production plan formulation method in which the extraction department extracts production plans that meet the target conditions from multiple production plans obtained based on multiple types of processing orders.

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