JPH03127202A - Production process design system - Google Patents

Abstract

PURPOSE:To always obtain an optimum production process series by changing the process code corresponding to an extracted process without fixing the code so as to obtain a process sequence accordant with the design conditions. CONSTITUTION:A rule processing is carried out based on the feature information on a production subject and all processes necessary for the subject are extracted. The process codes set previously to a process code table 307 are set opposite to each of extracted processes. These set codes are used as keys for a sorting processing in order to decide a working sequence of those processes. In this case, the process codes set opposite to the extracted processes are not fixed but can be changed by a code changing means of a process series processing part 308 so that a process sequence accordant with the design conditions is obtained. Thus it is possible to obtain an optimum production process series in consideration of the working, etc., that require the change of a process sequence according to the design conditions.

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention uses a computer to extract various processes necessary for production, and further sets and sets the mutual order of the extracted processes to form a work order. This invention relates to a production process design system that obtains a process sequence.

[Conventional technology] In a conventional production process design system, data is stored in a storage device in advance.
The total process series and the conditions for establishing each process are set in advance.

FIG. 2 specifically shows a total process series 110 set in a storage device and conditions 120 for each process in a conventional production process design system.

The total process series 110 is a list of processes that are likely to be used (usually classified according to differences in workplaces, machines used, etc.), taking into account the production equipment and production targets of the factory that uses the system. All of the listed processes are listed and arranged in a series of work orders, taking into account the cooperation between each process.

In the total process series 110 shown here as a specific example, each process is indicated by alphabets A, B, C, . . . , and the alphabetical order is the process order.

The total process series 110 covers all processes that are likely to be used so that it can be used for various production objects, and naturally includes unnecessary processes in the production process for a specific production object. .

Therefore, using the above-mentioned conditions 120, the total process series 11
Delete unnecessary processes from the processes included in 0.

The conditions 120 include parameters 130 that are characteristic information of each process included in the total process series 110.
and a relational expression 140 for determining whether or not to use the process.

The parameters 130 are characteristic information indicating the shape, dimensions, etc. of the production target, and in the case of process A, AI.

A2. A3 etc. is set as a parameter, and for each parameter, the condition (AI > 1000 ° A2 < 200
．． A3=500) is set.

Furthermore, the relational expression 140 gives, for each step, the relationship between the parameters necessary for that step to hold true, and if this relational expression does not hold true, that step will be deleted.

To explain using a specific example in FIG. 2, in step A, the relational expression i4
As 0, rA I AND A2 AND A3
J is shown, which has parameters At, A2A3
This means that process A is realized only when all of the following are true.

In addition, in process B, as the relational expression 140, “B10RB
2J is shown, which means that if either the parameters B1 or B2 are satisfied, the process B is established.

When designing a production process using a conventional production process design system, first, information (
(characteristic information).

Then, for each process, it is determined whether each parameter set in the above-mentioned conditions 120 holds true and whether each relational expression holds true or not, and unnecessary processes are deleted from all the processes included in the total process series 110. . Then, a work order (process sequence) in which the remaining processes are continued without disturbing the order in the total process sequence is obtained as a production process sequence for the production object.

For example, a judgment process is performed on a certain production target based on conditions that hold true, and from all the processes in the total process series 110, processes A,
If only C, G, and M remain without being deleted, the production process series of this production object is set as A-+C-4-G+M.

Problem to be solved by invention C] By the way, when sheet metal processing involves hole drilling and bending,
Basically, it is performed in the order of "hole machining 4 bending machining", but the third
As shown in the figure, the dimensional tolerance α between the hole position and the bending position
If the dimensional tolerance is small and there is a risk that the dimensional tolerance cannot be maintained due to processing errors caused by bending, "bending → hole drilling"
It is necessary to create a process series in this order.

However, in the conventional system described above, a total process sequence is prepared in which the process sequence, which is the work order, is uniquely determined, and the necessary production process sequence is obtained by removing only unnecessary processes from this total process sequence. It is. Therefore, in the case of processing where the order of the steps is determined sequentially (for example, in the case of milling using a lathe, etc.), it is possible to obtain an appropriate process sequence. There is a problem in that it cannot be used in cases where the order of processes needs to be changed depending on the process.

The present invention was made in view of the above-mentioned circumstances, and can be applied even in the case of processing, etc., where the order of steps needs to be changed depending on conditions.
Taking this into consideration, the objective is to obtain a production process design system that can obtain an optimal production process sequence.

[Means for Solving the Problems] The production process design file according to the present invention uses rules stored in the rule group file to extract processes necessary for producing the production target from the characteristic information of the production target. A rule processing unit, a process code table that stores process codes representing the work order of each process extracted by the rule processing unit, and a process code stored in the process code table for each process extracted by the rule processing unit. and a process sequence processing unit that sets a process sequence, which is an order of the processes, by sorting the process codes in association with each other.

The rule group file includes a process code change rule for changing the process code stored in the process code table according to the design conditions of the production object.

In addition, the process sequence processing unit changes the process code using the process code change rule, associates the changed process code with the process extracted by the rule processing unit, and processes the process sequence in accordance with the design conditions. A code modification means is provided to obtain the code.

[Operation] The production process design system according to the present invention first performs rule processing based on the characteristic information of the production target, extracts all the processes necessary for the production of the production target, and applies the rules to each of the extracted processes. associates process codes set in advance in a process code table, and determines the work order of the processes by sorting using the associated process codes as keys.

In this case, the process code associated with the extracted process is
It is not fixed, but can be changed using the code changing means of the process sequence processing unit so that a process order that matches the design conditions can be obtained, so it can be used in processing etc. where the order of processes needs to be changed depending on the conditions. By taking this into consideration, an optimal production process sequence can be obtained.

[Example] FIG. 1 is a block diagram of one embodiment of the present invention.

The production process design system of this embodiment is a CAD (co) for designing production objects such as sheet metal parts.
a process sequence generation device for generating a production process sequence for a production object, an input/output device 301 for inputting and outputting data to and from the process sequence generation device K; D
3.00 or an interface processing device 302 for enabling data exchange between the input/output device 301 and the process sequence generation device; and a buffer 303 that temporarily stores data exchanged between the two.

The process sequence generation device includes a rule group file 304 that stores various rules for each process to infer whether or not a process is established, and a rule group file 304 that stores rules for inferring whether a process is established or not, and a rule group file 304 that stores rules for inferring whether or not a process is established for each process, and a rule group file 304 that stores rules for inferring whether or not a process is established for each process, and a rule group file 304 that stores rules for inferring whether or not a process is established for each process, and a rule group file 304 that stores rules for inferring whether a process is established or not. A rule processing unit 305 that executes inference for each process, a master table 306 that temporarily stores processes that have been confirmed to be true by the rule processing unit 305, and the master table 306.
The process code table 307 stores process codes to be assigned to each process stored in the master table 306, and the mutual order of the processes stored in the master table 306 is set using the information in the process code table 307. , a process sequence processing unit 308 that creates a process sequence as a work sequence.
It is equipped with.

Hereinafter, the details of the functions of each part in this embodiment will be explained together with the procedure for creating a process sequence.

In this embodiment, the object to be produced is a sheet metal part.

First, the sheet metal drawings that are the production drawings of the object are created using the aforementioned CAD3.
00, and geometric information and processing information (including instructions regarding processing) are created as design drawing information.

From the geometric information and processing information, information (feature information) necessary for process design is provided to the interface processing device 302.
The data is taken out, converted into data in a predetermined format, and stored in the buffer 303.

In this case, the contents loaded into the buffer 303 are the manual items (
That is, the characteristic information is the parameter 13 shown in FIG.
0), and specifically, the various information shown in FIG. 4 corresponds to this.

To provide a supplementary explanation of Fig. 4, each characteristic information that becomes a human resource item is (1) management information, (2) basic information, and (3)
) Round hole information... It is divided into 10 blocks according to major classifications. Each major category is further classified into a subcategory called typeoo, and specific input items are listed in the subcategory.

The feature information created by the aforementioned CAD 300 is converted into predetermined data for each item and stored in accordance with the classification shown in Figure 4, but all (100%) of the information necessary for input is It is not necessarily included in the CAD information,
The operator additionally inputs the missing amount through the input/output device 301.

Next, based on the feature information of the drawing stored in the buffer 303, processing moves to extracting necessary steps. The extraction in this step is done according to production rules.

The rules stored in the rule group file 304 are basically classified into two categories, as shown in FIG. 5, one of which is the work name determination rule and the other is the machine name determination rule. Rule ■.

The work name determination rule ■ is based on characteristic information (1, J...
...) into work names (w+, wj...), and as shown in FIG. The characteristic information of the IF section 320 is set, and the work name corresponding to the characteristic information of the IF section 320 is set in the THEN section 321.

The machine name determination rule ■ is based on the work name (Wi, Wj...
...) into a machine name (or a process name if the machine is not used).As shown in Fig. (W
i, Wj...) are set, and the THEN section 323
The machine name (or process name) corresponding to the work name of the 11th part 322 is set in .

Note that in FIG. 5, the notation ropeJ in the IF sections 320 and 322 indicates logical product or logical sum.

The rule processing unit 305 is a processing unit whose core is an inference unit that utilizes production rules, and the first step of inference is based on feature information on the drawing (as described above,
This step is to obtain the work name from the data inputted from the D300 and the input/output device 301.

In this first step, the buffer 303 is set as a working memory, the rule group corresponding to the work name determination rule I in the rule group file 305 is activated as a rule to be inferred, and the work name corresponding to the established rule is extracted.

The extracted work name is stored in working memory (i.e. buffer 3).
03).

The second step of inference is the step of obtaining the machine name (or process name) required to perform the task from the task name obtained in the first step.

In this second step, the rule group corresponding to the machine name determination rule ■ of the rule group file 305 is activated as the inference target rule (at this time, the rule group corresponding to the work name determination rule I is deactivated), and the buffer The work name set in y303 is set in the IF section, and the machine name (or process name) corresponding to the established rule is extracted.

The extracted machine name (or process name) serves as a keyword to identify the production process, and is sequentially stored in master table 3.
It will be stored in 06.

At the stage where the second step of inference is completed, all processes necessary for producing the object having the characteristic information are randomly stored in the master table 306 based on the characteristic information inputted at the beginning. become.

FIG. 6 shows an example of data stored in the master table 306. The master table 306 in this example has a feature information column 330, an identification number column 33
Information column 332 regarding 11 holes, number column 333 of machined parts
, each work column 334, each machine column 335, TOOL number column 3
36.5 It has an information column 337 indicating HOP (work place), a process number column 338, a comment column 339, etc., and these columns provide characteristic information, identification number, information regarding holes, number of machined parts, and work name. , machine name, T00L number,
Information such as information indicating 5HOP (workplace), process number, and comments is stored.

Note that among the information stored in the master table 306,
Information such as characteristic information, identification numbers, hole information, number of machined parts, comments, etc. can be obtained from the CAD 300 or the input/output device
It is set by inputting from 01.

Further, the information on the work name and machine name is sent to the rule processing unit 30.
It is set by the inference process in step 5. In addition, the information indicating the TOOL number and 5HOP (workplace) is set based on the result of the city 1 inference processing, and the process number is set by the process sequence processing unit 308 with reference to the information in the process code table 307 as described later. is set by the process.

Now, when the rule processing unit 305 finishes extracting all the processes necessary for producing the object as described above, the process sequence processing unit 308 generates a process sequence based on the information in the process code table 307. .

As shown in FIG. 7, the process code table 307 includes a process name display column 340 and a process code display column 341.
It has a configuration having the following.

In the process name display column 340, all processes that have a probability of being used are listed in advance. Each process name listed here (in the illustrated example, process 1, process 2, etc.)
The same name as the machine name (or process name) obtained in the second step of inference in the rule processing unit 305 is used.

Further, in the process code display column 341, a process hood, which is a number indicating the work order of the process, is set for each process name in the process name display column 340.

Each process code (in the illustrated example, code 1, food 2, etc.)
is unique to each corresponding process name, and is set in advance taking into account production equipment and the like.

The process sequence processing unit 308 associates the process code set in the process code table 307 with each process stored on the master table 306. Then, the associated process code is stored in the master table 30.
6 is stored in the process number column 338. Furthermore, the process group stored in the master table 306 is sorted using the associated process code as a key, and a process series is created in which each process is arranged in ascending order (or descending order) of the process code number. create.

There may be a plurality of identical steps in the process series ordered in work order by the above-described sorting. Therefore, the process sequence processing unit 308 performs a process of merging consecutive identical processes as a post-sorting process.

Normally, a process sequence is generated by the above processing procedure.

However, the process codes set in the process code table 307 are set on the premise that the process order follows a standard pattern, and for example, as shown in FIG. Cases in which the order must be changed are not considered.

Therefore, the process sequence processing section 308 of this embodiment is equipped with code changing means for changing the process code set in the process code table 307 according to design conditions.

This code changing means is configured to change the code from the rule group file 30 in advance.
The process code is changed using the process code change rule stored in step 4.

Next, the code changing process of the code changing means will be described in detail.

FIG. 8 shows the process code change rule ■ set in the rule group file 304.

In this process code change rule ■, "condition Q" and "condition m" of the IF section 350 specify "drawing characteristic information" or "work name", etc., and the THEN section 360 specifies the information to be changed. Specify the process code to be processed.

To explain with a specific example, as shown in FIG. 3, if it is difficult to ensure the dimensional tolerance σ from a certain bending position in terms of standard processing accuracy, "Condition Q" and ""Conditionj" is "Tolerance σ is less than or equal to a predetermined value (σ<Number)" and "1f of this tolerance σ
t11 Specify the bending position j that will be the constant reference position, and then
In section 360, process codes for bending and hole machining are specified as process codes to be changed so that hole machining is performed after bending.

Then, according to this specification, "hole machining" related to that specification
, the process code for "bending" is "bending → hole machining"
The changes will be made so that the tasks are processed in the following order:

When a process code is changed according to the process code change rule (2), the changed process code is assigned to the process number in the master table 306.

Furthermore, if the process code is changed according to the process code change rule (■), sorting by the process sequence process 306 will be performed after the change process, and as a result, it is necessary to change the order of processes depending on the conditions. In the case of processing, etc., an optimal production process sequence can be obtained by taking this into account.

Note that the process code in the process code table 307 is initialized each time so that it becomes the basic process code at the beginning of processing by the system.

As explained above in detail, the production process design system of the above embodiment first performs rule processing based on the characteristic information of the production target to extract all processes necessary for producing the production target. Then, each extracted process is associated with a process code 341 set in advance in the process code table 307, and the work order of the processes is determined by sorting using the associated process code as a key.

In this case, the process code associated with the extracted process is
It is not fixed, but can be changed using the code changing means of the process sequence processing unit 308 so that a process order that matches the design conditions can be obtained, so in the case of processing, etc., where the order of processes needs to be changed depending on the conditions. However, by taking this into consideration, an optimal production process sequence can be obtained.

Note that the above embodiment was explained using sheet metal processing as an example, but
The present invention is not limited to this, but can be applied to any process sequence such as processing, assembly, and testing.

Additionally, the information shown in Figures 4 and 6 above is for sheet metal processing, and if processing other than sheet metal processing (for example, cutting using a machine tool such as a lathe) is required, further information may be required. Needless to say, information will be added accordingly.

[Effects of the Invention] As is clear from the above explanation, the production process design system according to the present invention first performs rule processing based on the characteristic information of the production target to determine the necessary information for producing the production target. All processes are extracted, each extracted process is associated with a process code set in advance in a process code table, and the work order of the processes is determined by sorting using the associated process code as a key.

In this case, the process code associated with the extracted process is
It is not fixed, but can be changed using the code changing means of the process sequence processing unit so that a process order that matches the design conditions can be obtained, so it can be used in processing etc. where the order of processes needs to be changed depending on the conditions. By taking this into consideration, an optimal production process sequence can be obtained.

[Brief explanation of the drawing]

Figure 1 is a block diagram of an embodiment of the present invention, Figure 2 is an explanatory diagram of a conventional production process design system, Figure 3 (a),
3(b) shows the objects to be produced, respectively. FIG. 3(a) is a plan view, FIG. 3(b) is a front view, FIG. 4 is an explanatory diagram of the input items of the above example, FIG. 5 is an explanatory diagram of the contents of the rule group file of one embodiment, FIG. 6 is an explanatory diagram of the contents of the master table of one embodiment, FIG. 7 is an explanatory diagram of the contents of the process code table of one embodiment, and FIG. 8 is an explanatory diagram of the contents of the process code table of one embodiment. It is an explanatory diagram of a process code change rule in one example. 300... CAD, 301... Input/output device, 302... Interface processing device,
303...Buffer, 304...Rule group file, 305...Rule processing il, 3
06...Master table, 307...
・Process code table, 308...Process series processing section, ■...Work name determination rule, ■...
・Machine name determination rule, ■・・・Process code change rule. Block diagram of one embodiment of the present invention Figure 2 Illustration of conventional production process design system Figure 2 Figure 3 Figure 7

Claims (1)

[Claims] A rule processing unit that extracts processes necessary for producing the production target from characteristic information of the production target using rules stored in a rule group file, and a process that is extracted by the rule processing unit. A process code table storing process codes representing the work order of each process, and associating the process codes stored in the process code table with each process extracted by the rule processing unit,
A production process design system comprising a process sequence processing unit that sets a process sequence, which is an order of processes, by sorting according to the process code, wherein the rule group file includes processes stored in the process code table. A process code change rule for changing the code according to the design conditions of the production object is provided, and the process sequence processing unit changes the process code using the process code change rule and transfers the changed process code to the rule. A production process design system characterized by comprising a code changing means for obtaining a process sequence that matches design conditions in association with a process extracted by a processing section.