JP2006146698A - Apparatus and system for data management - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus and a system for data management, which efficiently store revising know-how for designs by linking table information on examination ideas examined until the final idea of design changes and examination results to changed design data and managing them. <P>SOLUTION: In the data management system, names of a plurality of CAD data, which are changed as examination ideas, and names of CAD data selected from CAD data that is the examination idea are stored into a table. The data management system has a design change table creation and registration part 7, which creates a design change table 8; and a CAD data retrieval part 13, which retrieves CAD data related to the design change table 8 from a CAD data management database and outputs it to a three-dimensional CAD apparatus 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  In the present invention, for example, when a design change is made by computer-aided design (hereinafter referred to as CAD), the design change intention and the design examination result are tabulated, and the CAD data representing the design object and the change of the CAD data are displayed. The present invention relates to a data management apparatus and a data management system that manage history information in association with each other.

  A conventional data management apparatus registers change data in a database server when making a design change, and checks a difference before and after the change. If there is a change difference, it is managed as design history information. Further, whether or not the change is spread to other designs is inspected, and if it is spread, the change information is transmitted to the related department to support the consistency of the design data (for example, Patent Document 1). reference).

In addition, there is a conventional data management device in which a plurality of clients are connected to a server, and when the 3D shape data input from the server is changed in the client, the change difference shape data and the change difference history are transmitted from the client to the server. Send to. The server that has received them transmits the changed contents, that is, the shape change history to which the change difference history is added and the three-dimensional shape data to which the change difference shape data is added. Also, when data changes are made by multiple clients, the server change request management unit checks the consistency between the changes made earlier and the changes requested later, and the changes made earlier If a later change cannot be realized, delete the later change and send a message or the like to the client that made the later change.
In this way, when multiple designers perform modeling work on a single model in parallel, the design contents modified by each designer can be quickly shared to maintain the consistency of the entire design object. (For example, refer to Patent Document 2).

  In addition, when integratedly managing deliverables manufactured in the manufacturing process or business process, a Product Data Management (hereinafter referred to as PDM) system is used. In this PDM system and the data management apparatus described above, the final Data such as the examination plan and the data representing the examination result studied before reaching the decision plan is not managed, and the revised CAD data and these examination plans are not managed in association with each other. The data representing these examination plans and examination results becomes information managed by the individual designer in charge and is not shared among a plurality of designers.

Japanese Patent Laid-Open No. 11-39356 (page 3, page 4, FIGS. 1 and 2) JP 2001-249839 A (page 4, page 5, FIGS. 1 to 3)

  Since the conventional data management device is configured as described above, the data of the examination plan and examination result becomes the information managed by the individual designer in charge and is not shared among multiple designers. The designer who is not related to the revision of the system cannot easily know the reason for the design change or the reason for narrowing down the examination plan, and there is a problem that it is difficult to efficiently accumulate the design revision know-how.

  The present invention has been made to solve the above-described problems, and the examination plan and the examination result studied until reaching the final design change plan are used as table information and managed in association with the changed design data. It is an object of the present invention to obtain a data management apparatus and a data management system that efficiently accumulate design revision know-how.

  The data management apparatus according to the present invention includes a CAD data management database for storing CAD data created by the CAD data creation means, a data configuration table creation registration means for creating a data configuration table describing the configuration information of the CAD data, The data structure management database for registering the data structure table under the control of the data structure table creation / registration means, the names of a plurality of CAD data changed as a study plan, and the selected CAD data as the study plan Stored in the design change table creation / registration means for creating a design change table in which the names of CAD data are tabulated, the design change management database for registering the design change table under the control of the design change table creation / registration means, and the design change management database Multiple design change tables Selection reason display means for allowing a designer to select a desired design change table from the above, and a data configuration table related to the selected design change table extracted from the data configuration management database and described in the data configuration table CAD data extracting means for extracting CAD data from the CAD data management database based on the information and outputting the CAD data to the CAD data creating means is provided.

  According to the present invention, data configuration table creation / registration means for creating a data configuration table describing configuration information of CAD data, names of a plurality of CAD data changed as a study plan, and CAD data used as the study plan Design change table creation / registration means for creating a design change table in which the names of CAD data selected from the above are tabulated, and a desired design change table from a plurality of design change tables stored in the design change management database Selection reason display means for allowing the designer to select, and CAD data extraction means for outputting CAD data to the CAD data creation means based on the configuration information described in the data configuration table related to the selected design change table. It is possible to efficiently accumulate and share design revision know-how. There is an effect that.

An embodiment of the present invention will be described below.
Embodiment 1 FIG.
FIG. 1 is a block diagram showing a configuration of a data management apparatus according to Embodiment 1 of the present invention. The illustrated data management device 1 is connected to a three-dimensional CAD device 2. The three-dimensional CAD device 2 is composed of, for example, a personal computer equipped with display means for displaying a screen and input / operation means such as a keyboard, while displaying a design object as a three-dimensional image by operating a three-dimensional CAD program or the like. It is designed to create 3D CAD data. The three-dimensional CAD device 2 has a function as a designer terminal for creating and changing the three-dimensional CAD data and allowing the designer to set operation of the data management device 1.

The data management device 1 includes a three-dimensional CAD data management database (hereinafter referred to as D / B) 3 for storing / registering three-dimensional CAD data created by the three-dimensional CAD device 2, and a three-dimensional CAD data management A data configuration table creation / registration unit 4 that creates a data configuration table 5 composed of names of components represented by each three-dimensional CAD data stored in the D / B 3, and data configuration management that stores / registers the data configuration table 5 D / B6.
The data management device 1 also receives a design change table creation / registration unit 7 that inputs the data representing the name of each data configuration table 5 from the data configuration table creation / registration unit 4 and creates the design change table 8, and the design change table 8. And a design change management D / B 9 for storing / registering. The design change table 8 is finally selected from the name of each data configuration table 5 created for each examination plan, the evaluation method for the examination plan, the evaluation value obtained when the evaluation method is used, and each examination plan. This is constituted by the name of the data structure table 5 of the examination plan selected by the designer.

The data management device 1 associates the name of the data configuration table 5 with the name of the design change table 8, and stores / registers this information in the design change table search D / B 11; Selection reason display for searching the contents stored / registered in the design change table search D / B 11 and the design change management D / B 9 and displaying the contents stored in each D / B by controlling predetermined display means 3D CAD data for extracting predetermined 3D CAD data from the 3D CAD data management D / B3 based on the contents registered in the unit 12 and the design change table search D / B11 and outputting them to the 3D CAD device 2 And a take-out unit 13.
The three-dimensional CAD data management D / B3, the data configuration management D / B6, the design change management D / B9, and the design change table search D / B11 are composed of a nonvolatile memory unit or the like as hardware. Each data is written and read according to a predetermined format.

Next, the operation will be described.
The three-dimensional CAD device 2 creates three-dimensional CAD data according to the designer's operation. This three-dimensional CAD data is created for each element constituting the design object. The three-dimensional CAD data created by the three-dimensional CAD device 2 is input to the three-dimensional CAD data management device 1 and stored / registered in the three-dimensional CAD data management D / B 3 via, for example, an input unit (not shown). When a design change or the like is performed in the 3D CAD device 2 for the 3D CAD data stored / registered in the 3D CAD data management D / B3, the data management device 1 is designated by the 3D CAD device 2 The three-dimensional CAD data is extracted from the three-dimensional CAD data management D / B 3 and the data is input to the three-dimensional CAD device 2. The subsequent operation of the data management device 1 will be described.
FIG. 2 is a flowchart illustrating the operation of the data management apparatus according to the first embodiment. The design change table creation / registration unit 7 sets a name that is not duplicated and describes it in the “table name” field of the design change table 8, and creates the design change table 8 having the name (step ST101).

Next, the data configuration table creation / registration unit 4 creates a data configuration table 5 related to the three-dimensional CAD data of the original data to be changed in design, sets a name that does not overlap in the data configuration table 5 and sets data configuration management D / Register to B6 (step ST102).
The design change table creation / registration unit 7 stores the name of the data configuration table 5 set by the data configuration table creation / registration unit 4 at this time in the “original data” column of the design change table 8 (step ST103). Next, the design change table creation / registration unit 7 describes the evaluation method to be applied based on the design change requirement in the “evaluation method” column of the design change table 8 (step ST104). The setting of the evaluation method to be applied based on the design change requirement is performed, for example, in the three-dimensional CAD device 2 operated by the designer, and data indicating this evaluation method is input from the three-dimensional CAD device 2 to the data management device 1. The above processing is performed.
Next, the data configuration table creation / registration unit 4 creates a data configuration table 5 relating to the three-dimensional CAD data whose design content has been changed as an examination plan, and sets a name that does not overlap with that already created, and sets the data Registration in the configuration management D / B 6 (step ST105). Hereinafter, the three-dimensional CAD data in which the design content is changed is described as candidate data.
The design change table creation / registration unit 4 stores the name of the data configuration table 5 created in step ST105 in the “candidate data” field of the design change table 8 (step ST106).

  For example, the “evaluation method” described in the design change table 8 is applied to the candidate data in step ST104 by an evaluation means not shown in FIG. The design change table creation / registration unit 7 stores each evaluation result obtained at this time in the “evaluation value” field of the design change table 8 (step ST107). Further, a comprehensive evaluation value is obtained by a predetermined calculation for each evaluation value, and the calculated value is stored in the “total evaluation value” column of the design change table 8 (step ST108). Note that the above evaluation means may be provided in either the data management device 1 or the three-dimensional CAD device 2. When the three-dimensional CAD device 2 is provided, the obtained “evaluation value” and “total evaluation value” are provided. Input to the data management device 1. The evaluation means is, for example, an analysis tool or a simulation tool.

The comprehensive evaluation value obtained in this way is shown to the designer using, for example, the three-dimensional CAD device 2, and the designer is further changed as another examination plan until a result satisfying the design change requirement is obtained. Alternatively, the creation of three-dimensional CAD data in which the original data is newly changed is prompted, and the processing steps of steps ST105 to ST108 are repeated.
Next, candidate data satisfying the design change requirement among a plurality of candidate data is stored in the “selected data” field of the design change table 8 (step ST109). The processing operation for selecting selection data from a plurality of candidate data is to select the data satisfying a predetermined value by the evaluation means as described above, or operate the three-dimensional CAD device 2 to perform the design change work. You may make it let the designer who is performing choose.

  After the data structure table 5 and the design change table 8 are created in this way, the design change table search related information registration unit 10 selects the selection data described in the design change table 5 for use in the search function described in detail below. And the name of the design change table 8 are registered in the design change table search D / B 11 (step ST110). Finally, the design change table creation / registration unit 7 registers the design change table 8 in the design change management D / B 9 (step ST111).

  FIG. 3 is an explanatory diagram illustrating a design change table created by the design change table creation registration unit according to the first embodiment. The design change table creation / registration unit 7 includes a table name column 21, an original data column 22, an evaluation method column 23, a candidate data column 24, a selection data column 25, an evaluation value column 26, and a comprehensive evaluation value The design change table 8 having each column 27 is created. The evaluation method column 23, the candidate data column 24, the evaluation value column 26, and the comprehensive evaluation value column 27 each include a plurality of columns. The evaluation method column 23 includes, for example, m columns, and stores, for example, evaluation methods 1 to m as names of the evaluation methods. The candidate data column 24 includes, for example, n columns and stores data configuration table names 1 to n. The evaluation value column 26 includes, for example, n × m columns and stores evaluation values (1, 1) to (n, m). The comprehensive evaluation value column 27 includes n columns and stores the comprehensive evaluation values (1) to (n).

The design change table creation / registration unit 7 sets a name for identifying the design change work to be performed and stores it in the table name column 21. The name set in the data configuration table 5 created for the original three-dimensional CAD data before the design change is input from the data configuration table creation registration unit 4 and stored in the original data column 22.
In the column 23 of the evaluation method, for example, a method for obtaining the volume, center of gravity, weight, strength, heat quantity, etc. of the design object, manufacturing cost, manufacturing accuracy, etc. are described as items. This describes a plurality of methods for evaluating elements that are indispensable depending on the design object and the contents of the change. The contents described in this column include, for example, a designer who has made a design change as described above, examines an evaluation method that satisfies the design change requirements, and sets an appropriate evaluation method using the three-dimensional CAD device 2 or the like, or The design change table creation / registration unit 7 may automatically select and describe an evaluation method set in advance for itself. Alternatively, a separate evaluation means is provided inside the data management device 1 and an evaluation method is automatically selected according to the contents of change or the designer is made to select, and the design change table creation registration unit 7 designs the evaluation method. It may be described in the change table 8.

The candidate data field 24 stores, for example, names 1 to n of n data configuration tables 5 input from the data configuration table creation / registration unit 4. The names 1 to n in the data configuration table 5 identify each candidate data.
The evaluation value column 26 stores each evaluation value obtained by applying each of the evaluation methods 1 to m described in the evaluation method column 23 to the candidate data.
In the comprehensive evaluation value column 27, comprehensive evaluation values (1) to (n) obtained for each candidate data are described. The comprehensive evaluation value is obtained by using a predetermined evaluation formula using each evaluation value obtained by applying each evaluation method to the candidate data as a variable.
In the selection data column 25, the obtained overall evaluation values (1) to (n) are respectively compared, and for example, candidate data having a value most suitable for the design object and change contents is selected, and the candidate data is related. The name of the data configuration table 5 is stored.
The design change table 8 created in this way is registered in the design change management D / B 9 using the name of the design change table 8 as a search key.

FIG. 4 is an explanatory diagram showing a data configuration table created by the data configuration table creation / registration unit according to the first embodiment. This figure shows a data configuration table 5 created by the data configuration table creation / registration unit 4 shown in FIG. 1, and the data configuration table 5 includes a data name column 31 and data components 1 to n. And a data component column 32 composed of a plurality of columns for storing.
As described with reference to FIG. 2, the data configuration table creation / registration unit 4 stores the name of the data configuration table 5 set in the process of step ST102 in the data name column 32 of FIG. Further, the names of the elements constituting the design target are stored in the data component column 32 as the data components 1 to n, for example, the elements such as the assembly, subassembly, and part to be designed. The data configuration table 5 created by storing the configuration information composed of the plurality of data components 1 to n in this way is registered in the data configuration management D / B 6 using the name of the data configuration table 5 as a search key. The three-dimensional CAD data management D / B 3 stores three-dimensional CAD data created for each element to be designed in this way.

FIG. 5 is an explanatory diagram showing a design change table search database according to the first embodiment. This figure shows the contents registered in the design change table search D / B 11 shown in FIG. The design change table search D / B 11 includes a selection data column 35 and a design change table name column 36.
The design change table search related information registration unit 10 appropriately inputs the contents to be stored in the selection data column 25 of each design change table 8 from the design change table creation registration unit 7 and selects the design change table search D / B 11 selection data. Stored in the column 35. Similarly, the name of each design change table 8 is input from the design change table creation etc. registration section 7 and stored in the design change table name column 36. Further, the selection data column 35 is set so that the selection data stored in the selection data column 35 is the same as that described in the design change table 8 having the name stored in the design change table name column 36. And the design change table name column 36 are stored in the design change table search D / B 11 in association with each other.
In this way, the names of all the design change tables 8 registered in the design change management D / B 9 and the selection data related to these design change tables 8, that is, the names of the data configuration tables 5 are stored.

As described above, when the three-dimensional CAD data is changed, the data management apparatus 1 and the three-dimensional CAD apparatus 2 operate, and the evaluation values and the like that are the contents studied in the change work are displayed in the design change table 8. As described later, for example, when a designer other than the designer who made the design change makes further changes or the like, the above-examined contents can be browsed. To do. It is necessary to create and store / register such a table for 3D CAD data because it is particularly difficult to write a note or the like in the drawing.
The description so far has been the operation to change the design to the already created 3D CAD data. However, the newly created 3D CAD data is processed in the same manner, so that the examination contents during the design can be changed. It can be stored / registered as candidate data. In this case, since there is nothing corresponding to “original data”, the data structure table 5 of the original data is not created, and the “original data” column 22 of the design change table 8 is processed as a blank column.

FIG. 6 is an explanatory diagram illustrating a selection reason display target selection screen output by the selection reason display unit according to the first embodiment. This figure is an example of a selection screen generated by the selection reason display unit 12 shown in FIG. 1 and displayed on the display means of the three-dimensional CAD device 2, for example. On the selection reason display target selection screen 40, names 41 of all selection data registered in the design change table search D / B 11 and selection buttons 42 corresponding to the names 41 of the selection data are displayed.
After a three-dimensional CAD data is changed by a certain designer, for example, when another designer confirms the reason for the change of the changed three-dimensional CAD data, the operator operates the three-dimensional CAD device 2 etc. 6 is displayed, and a desired one is selected by operating the selection button 42 from among a plurality of selection data names 41 displayed on the screen.

  FIG. 7 is an explanatory diagram showing a selection reason display screen output by the selection reason display unit according to the first embodiment. In this figure, when desired selection data is selected on the selection reason display object selection screen 40 shown in FIG. 6, the selection reason display unit 12 displays, for example, on the display means of the three-dimensional CAD device 2 according to this selection operation. It is an example of a selection reason display screen. On the selection reason display screen 50, the contents described in the design change table 8 shown in FIG. 3 are displayed. The table name 51, the selection data 52, the original data 53, the candidate data 54, the evaluation method 55, An evaluation value 56, a comprehensive evaluation value 57, and a selection button 58 are displayed. Among these, a plurality of candidate data 54, evaluation values 56, and comprehensive evaluation values 57 are displayed in the same manner as described in the design change table 8. Further, the selection buttons 58 are provided corresponding to the selection data 52, the original data 53, and each candidate data 54 one by one.

FIG. 8 is a flowchart showing the operation of the selection reason display unit according to the first embodiment.
When the other designers described above operate the 3D CAD device 2 to change the 3D CAD data stored in the 3D CAD data management D / B3, for example, the selection reason display unit 12 When a message indicating that is input from the CAD device 2 via an input means (not shown) or the like, all selection data 35 registered in the setting change table search D / B 11 as shown in FIG. 6 is displayed on the display means of the three-dimensional CAD device 2, for example, as shown in FIG. 6 (step ST201).

The designer selects the desired “selection data” from the selection data 41 displayed on the selection reason display target selection screen 40, and makes the design change table search D / B 11 correspond to the “selection data”. The name of the registered “design change table” is determined (step ST202).
The selection reason display unit 12 searches for a “design change table” having a fixed name from those registered in the design change management D / B, and searches the contents of the “design change table” in, for example, the three-dimensional CAD device 2. It is displayed on the display means (step ST203). The display at this time is performed like the selection reason display screen 50 shown in FIG.

FIG. 9 is a flowchart showing the operation of the three-dimensional CAD data extraction unit of the data management apparatus according to the first embodiment.
When the selection reason display unit 12 displays the selection reason display screen 50 shown in FIG. 7 on, for example, the three-dimensional CAD device 2, the three-dimensional CAD data extraction unit 13 is based on an operation performed on the three-dimensional CAD device 2. It operates as follows.

On the selection reason display screen 50, the names of the data configuration tables 5 set as the selection data 52, the original data 53, and the plurality of candidate data 54 are displayed in correspondence with the selection buttons 58, respectively. Of these items, the designer desires the designer to select the item to be displayed by operating the selection button 58 (step ST301). The three-dimensional CAD data extraction unit 13 searches the data configuration management D / B 6 for the data configuration table 5 having the selected name (step ST302). Three-dimensional CAD data corresponding to all the data components described in the retrieved data configuration table 5 is extracted from the three-dimensional CAD data management D / B 3 (step ST303). The three-dimensional CAD data taken out from the three-dimensional CAD data management D / B 3 is output to the three-dimensional CAD device 2, and the design target image indicated by the three-dimensional CAD data is displayed (step ST304).
Display any one of the original data, candidate data, and selection data related to the 3D CAD data that has been changed in this way, and know the process of the change later, including the candidate data that has been considered To be able to.

The data management device 1 shown in FIG. 1 is connected to a three-dimensional CAD device 2 provided outside, but the data management device 1 has the functions provided in the three-dimensional CAD device 2 and these devices. May be integrated. The three-dimensional CAD device 2 connected to the data management device 1 includes data input / output means for processing input / output data of a plurality of three-dimensional CAD devices 2 in the data management device 1, and each three-dimensional CAD device 2. The same operation and effect can be obtained also when it is configured to manage the three-dimensional CAD data created or modified by the above.
Further, the data management device 1 and the three-dimensional CAD device 2 are each provided with a communication means, and a plurality of three-dimensional CAD devices 2 and the data management device 1 are connected by communication lines, and the three-dimensional CAD devices 2 installed in various places are used. A similar effect can be obtained when a data management system for managing the created or redesigned three-dimensional CAD data is configured.

  As described above, according to the first embodiment, the design change table 8 describing the original data before the design change, the candidate data to be considered, and the selection data finally determined as the design change content is created. Then, the design change table 8 is registered in the database, and the contents described later in the design change table 8 are displayed on, for example, the three-dimensional CAD device 2 as a designer terminal. Efficient storage and sharing are realized, and there is an effect that a designer other than the person in charge can easily grasp the intention of the design change.

It is a block diagram which shows the structure of the three-dimensional CAD management apparatus by Embodiment 1 of this invention. 3 is a flowchart illustrating an operation of the data management apparatus according to the first embodiment. It is explanatory drawing which shows the design change table which the design change table creation registration part by Embodiment 1 produces. It is explanatory drawing which shows the data structure table which the data structure table preparation registration part by Embodiment 1 produces. It is explanatory drawing which shows the design change table search database by Embodiment 1. It is explanatory drawing which shows the selection reason display object selection screen which the selection reason display part by Embodiment 1 outputs. It is explanatory drawing which shows the selection reason display screen which the selection reason display part by Embodiment 1 outputs. 6 is a flowchart showing an operation of a selection reason display unit according to the first embodiment. 4 is a flowchart illustrating an operation of a three-dimensional CAD data extraction unit of the data management device according to the first embodiment.

Explanation of symbols

  1 data management device, 2 3D CAD device, 3 3D CAD data management D / B, 4 data configuration table creation / registration unit, 5 data configuration table, 6 data configuration management D / B, 7 design change table creation / registration unit, 8 Design change table, 9 Design change management D / B, 10 Design change table search related information registration part, 11 Design change table search D / B, 12 Selection reason display part, 13 3D CAD data extraction part, 21 Table name Column, 22 source data column, 23 evaluation method column, 24 candidate data column, 25 selection data column, 26 evaluation value column, 27 comprehensive evaluation value column, 31 data name column, 32 data component column Column, 35 selection data column, 36 design change table name column, 40 selection reason display target selection screen, 41 selection data, 42 selection button Down, 50 Reason for selection display screen, 51 a table name, 52 selection data, 53 yuan data, 54 candidate data, 55 evaluation method, 56 evaluation value, 57 total evaluation value, 58 selection buttons.

Claims (5)

A CAD data management database for storing CAD data created by the CAD data creating means;
Data configuration table creation / registration means for creating a data configuration table describing the configuration information of the CAD data;
A data configuration management database for registering the data configuration table under the control of the data configuration table creation registration means;
A design change table creation / registration means for creating a design change table in which the names of a plurality of CAD data changed as a study plan and the names of CAD data selected from the CAD data as the study plan are tabulated;
A design change management database for registering the design change table under the control of the design change table creation registration means;
Selection reason display means for allowing a designer to select a desired design change table from a plurality of design change tables stored in the design change management database;
A data structure table related to the selected design change table is extracted from the data structure management database, and CAD data is extracted from the CAD data management database based on the structure information described in the data structure table. A data management device comprising CAD data extraction means for outputting to a computer. Design change table search related information registration means for creating information indicating the relationship between the data configuration table and the design change table;
A design change table search database for storing information indicating the relationship between the data configuration table and the design change table under the control of the design change table search related information registration means;
The selection reason display means displays information on the design change table stored in the design change table search database on the display means of the CAD data creation means, and prompts the designer to select on the display screen,
2. The data management apparatus according to claim 1, wherein the CAD data extraction unit extracts a data configuration table related to the design change table selected by the CAD data generation unit from the design change table search database.   The design change table creation / registration means includes a name of a plurality of CAD data changed as an examination plan, a plurality of evaluation methods for evaluating each CAD data, an evaluation value obtained by each evaluation method, and a total obtained from each evaluation value 3. The data management apparatus according to claim 1, wherein a design change table is created in which an evaluation value and a name of CAD data selected based on the comprehensive evaluation value are described.   4. The data management apparatus according to claim 3, wherein the design change table creating means obtains a comprehensive evaluation value by using an evaluation formula having each evaluation value as a variable. A CAD data management database for storing CAD data created by CAD data creating means connected by a communication line;
Data configuration table creation / registration means for creating a data configuration table describing the configuration information of the CAD data;
A data configuration management database for registering the data configuration table under the control of the data configuration table creation registration means;
A design change table creation / registration means for creating a design change table in which the names of a plurality of CAD data changed as a study plan and the names of CAD data selected from the CAD data as the study plan are tabulated;
A design change management database for registering the design change table under the control of the design change table creation registration means;
Design change table search related information registration means for creating information indicating the relationship between the data configuration table and the design change table;
A design change table search database for storing information indicating the relationship between the data configuration table and the design change table under the control of the design change table search related information registration means;
Selection reason display means for displaying information on a plurality of design change tables stored in the design change table search database on the display means of the CAD data creating means, and prompting the designer to select on the display screen;
A data configuration table related to the design change table selected by the CAD data creation means is extracted from the design change table search database, and CAD data is extracted from the CAD data management database based on the configuration information described in the data configuration table. A data management system comprising: CAD data extracting means for extracting data and outputting it to the CAD data creating means.

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