JPH1145352A - Three-dimensional solid modeling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the generation of a three-dimensional solid model for developing the product of plural designs by executing three-dimensional solid modeling through the use of a previously generated form generation procedure. SOLUTION: The cross section form An of one part being a base and a requested modeling object member name are inputted and an appropriate cross section form pattern belonging to an input cross section form is selected from a database so as to select the model of the form generation procedure to be executed. The value of the parameter in the form generation procedure is inputted and is substituted. Thus, the form generation procedure for generating the three-dimensional solid model of the other member requested from the input cross section form An is decided. When the form generation procedure is executed on the cross section form An, a work cross section form where an inputted parameter value is reflected is automatically generated, and simultaneously shopping or basic solid modeling operatiou to the cross section form is automatically executed and then the three-diwensional solid modeling of the requested member is generated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-dimensional solid modeling method for a plurality of parts having similar sectional shapes.

[0002]

2. Description of the Related Art Conventionally, a three-dimensional solid model is generated by inputting a cross-sectional shape and performing basic solid modeling operations such as extrusion, sweeping, rotation, cutting, and mirror-copying on the cross-sectional shape. I have. For example, JP-A-7-
No. 73341 discloses that two solid models are generated by inputting two kinds of cross-sectional shapes and performing basic modeling operation of sweeping (sweep) on both cross-sectional shapes, and a process based on a definition regarding an overlap between the two solid models is described. It is shown that the addition of す る generates the desired three-dimensional model. FIG. 14 illustrates the method disclosed in the above-mentioned publication, in which the solid models M1 and M2 are created by performing a sweeping (or pushing) operation of i and ii on the cross-sectional shapes I and II, respectively. A solid model M3 is generated by deleting the model M2.

[0003]

By the way, among various kinds of products, there are those which are constituted by a plurality of parts having similar cross-sectional shapes. Rain gutters are just one example.Each gutter for connecting eaves gutters, outer bends, inner bends, stops, and water collectors have different shapes from eaves gutters. Because of the insertion connection, they have portions having substantially the same cross-sectional shape.

In performing such three-dimensional solid modeling of a plurality of parts, when the solid modeling of each part is performed by the above-described conventional method, although the cross-sectional shapes of the parts are the same or similar, the overall shape is similar. Since they are not the same, it is necessary to input the required cross-sectional shape for each part. In addition, since rain gutters have various designs (including dimensional differences such as heights) even with the same component configuration, it is necessary to input a cross-sectional shape for each component of each design.

[0005] Therefore, in order to develop products of rain gutters having a plurality of designs, three-dimensional solid modeling also requires much work and time. The present invention has been made in view of such a point, and an object of the present invention is to provide a three-dimensional solid modeling method capable of easily creating a three-dimensional solid model for product development of a plurality of designs. To be.

[0006]

According to the present invention, there is provided a work procedure for performing a three-dimensional solid modeling of another part based on a cross-sectional shape of a part designed in the past. The procedure and cross-sectional shape pattern are organized, and the parameters that can be numerically controlled are replaced with variables and parameterized, and stored in a database as a template for the shape creation procedure of the modeling target part for each cross-sectional shape pattern. Enter the cross-sectional shape of one part, the required modeling target part name, and the value of the parameter in the shape generation procedure, and search the database for an appropriate cross-sectional shape pattern similar to the input cross-sectional shape, and create the shape By selecting a template for the procedure and substituting the value of each parameter into this, a 3D solid model of other parts required from the input cross-sectional shape Determine the shape creation procedure for creating the shape, and automatically create and obtain the working section shape necessary for 3D solid modeling of other parts by deforming the input section shape by the above shape creation procedure. Extrusion, sweep, rotation,
It is characterized in that a basic solid modeling operation such as cutting and mirror copying is performed to generate a three-dimensional solid model of another part.

By accumulating a procedure for three-dimensional solid modeling of each part of a product composed of a plurality of parts of a certain design as a shape creation procedure, the tertiary order of each part of the same kind of commodity composed of a plurality of parts of another design is stored. The original solid modeling can be performed almost automatically by the above-mentioned shape creation procedure only by inputting the basic cross-sectional shape in the design.

[0008] Three-dimensional solid modeling of another part may be performed from the working sectional shape created during the shape creation by the three-dimensional solid modeling method.
According to the shape creation procedure, a working cross-sectional shape of another part is automatically created by deforming a working cross-sectional shape of a part, and the obtained working cross-sectional shape is extruded, swept, and rotated. A basic solid modeling operation such as cutting and mirror copying may be performed to generate a three-dimensional solid model of another component. The effort of inputting the basic cross-sectional shape can be saved.

Further, three-dimensional solid modeling of another part may be performed from an intermediate shape of the three-dimensional solid model created during the creation of the shape of the part by the three-dimensional solid modeling method. By performing basic solid modeling operations such as extrusion, sweeping, rotation, cutting, and mirror mirroring on the intermediate shape of a 3D solid model of a part by the shape creation procedure, a 3D solid model of another part can be generated. I just need. Also in this case, it is possible to save the trouble of inputting the basic cross-sectional shape.

A cross-sectional shape pattern which is registered in advance and parameterized by replacing its dimensions and constraint conditions with variables is prepared, and an arbitrary value is input to each parameter of the cross-sectional shape pattern as an input cross-sectional shape. A thing may be used. Further, as the input cross-sectional shape, a shape based on numerical data obtained by measuring the dimensions of the actual or actual model of the part may be used.

In creating a shape creation procedure, a procedure in which a worker performs a three-dimensional solid modeling of a part in an interactive manner is recorded, and the procedure is arranged for each minimum work procedure unit. It can be created by saving it in a form that can be automatically played back at any time and that can be edited in the minimum unit of work.At this time, in the deformation operation of the cross-sectional shape specified in the shape creation procedure and the basic solid modeling operation It is preferable to replace the portion that can be numerically controlled with a variable into a parameter, change the value of this parameter to update the shape creation procedure, and perform three-dimensional solid modeling according to the updated shape creation procedure.

[0012] In addition, in the operations of deforming the cross-sectional shape and the basic solid modeling operation defined in the created shape creation procedure, those in which numerically controllable parts are replaced with variables and parameterized are used. Parameter values are input collectively before the execution of the shape creation procedure, or when the parameter whose value is undetermined appears during execution, the shape creation procedure is determined by interactively inputting the parameter value. It is preferable that a constraint condition is defined by defining a limitation and an association between parameters, and a mathematical expression of the constraint condition is input to uniquely determine a shape creation procedure.

Further, model data of an intermediate shape of a three-dimensional solid model created during the creation of a shape of a part and model data of a final shape after the creation of the shape is input to a tool for performing various analyzes and obtained from the tool. Based on the analysis results, update the shape generation procedure by modifying the parameter values related to the analysis result and the constraints in the shape generation procedure for the part based on the analysis result, and execute 3D solid modeling according to the updated shape generation procedure It is also preferable to do so. By repeating these series of operations, the design of the corresponding part can be optimized.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described. In the present invention, three-dimensional solid modeling is performed using a previously created shape creation procedure. Starting from the creation of a shape creation procedure for 3D solid modeling of products centering on eaves gutters, this describes the procedure when an operator interactively performs 3D solid modeling of a part. This is arranged for each minimum work procedure unit, and stored in a form that can be automatically reproduced at any time in the order of execution by the operator and that can be edited in the minimum work unit, thereby creating a shape creation procedure.

For example, when performing a three-dimensional solid modeling of an eaves joint used for connection of an eaves gutter having a certain shape, an operator first determines the cross-sectional shape of the eaves joint as follows. Will be done. That is, FIG.
As shown in (1), a cross-sectional shape B is created by inputting a cross-sectional shape (outer cross-sectional shape) A of an eave gutter and then offsetting the outer side of the cross-sectional shape A by a clearance in consideration of fitting. . Further, a procedure for offsetting by the thickness is added to the outer side of the cross-sectional shape B to create a cross-sectional shape C, and the end portions of the cross-sectional shapes B and C are connected and closed (procedure) to thereby provide a work cross-sectional shape D having a thickness. If necessary, shaping based on knowledge and experience (for example, hitting or engaging shape when mounting the eaves joint on the eaves gutter) is added to the work sectional shape D if necessary (procedure). A cross-sectional shape E is created. Then, an extruding process (procedure) is performed on the work sectional shape E to create a basic three-dimensional solid model F, as shown in FIG. By performing shaping (procedure), an intermediate shape G is created, and a mirror surface copy process (procedure) is performed on the intermediate shape G to create a three-dimensional solid model H that is an eave joint. When the designer) performs, each of the above work procedures ~
And organize them into individual minimum work procedure units,
It is stored in a form that can be automatically reproduced at any time in the order of execution by the operator and that can be edited in the minimum work unit (see FIG. 4). In this storage, as shown in FIG. 5, in the deformation operation of the cross-sectional shape and the basic solid modeling operation defined in the shape creation procedure, a portion that can be numerically controlled such as the offset value is replaced with a variable. Parameterize. In some cases, interactively input values to each parameterized variable to update the shape creation procedure, or to restrict the fluctuation range of each parameter value and to define the relations between parameters and formulate constraint conditions Is provided, and if the solution of the equation of the constraint condition is input, that is, if the value of a certain variable is input, another variable is determined.

Similarly, the procedure for performing three-dimensional solid modeling of a part such as a stop or a bent joint corresponding to the cross-sectional shape A of the eaves gutter is recorded after parameterization relating to numerical values, and the shape creation for the part is performed. Create as a procedure. Further, as the cross-sectional shape of the eaves gutter, the cross-sectional shape A
In addition, the sectional shapes A ′, A ″, A ″ ″ as shown in FIG.
Therefore, for these, similarly, a shape creation procedure for performing three-dimensional solid modeling of each corresponding component from the cross-sectional shapes A ′, A ″, A ″ ″ is created.

As shown in FIG. 10, each of the shape creation procedures obtained in this manner is based on the sectional shape pattern A, A ′, A ″, A ′ ″ of the basic eaves gutter. Separate them separately and divide them into the names of the parts to be created (eave joints, stops, etc.) and store them in the database as templates. Then, when performing three-dimensional solid modeling of the eaves gutter of a new design and each part corresponding thereto, as shown in FIG. 1, the cross-sectional shape An of the base one part and the name of the required modeling target part (E.g., eave joints), and from the database, search for an appropriate cross-sectional shape pattern similar to the input cross-sectional shape to select a template of the shape creation procedure to be executed, and to set parameter values in the shape creation procedure. Is determined by inputting and substituting a shape creation procedure for creating a three-dimensional solid model of another part required from the input cross-sectional shape An.

If this shape creation procedure is executed for the sectional shape An, the working sectional shapes Dn and En reflecting the input parameter values in the procedure shown in FIG. In addition to the automatic generation, the shaping and basic solid modeling operations are automatically performed on the work sectional shape En in the procedure shown in FIG. 8 to generate the three-dimensional solid modeling of the required part.

In generating a three-dimensional solid model of another part by executing a shape generation procedure for the part, the three-dimensional solid modeling is not performed for the basic cross-sectional shape An, but is performed in FIG. As shown by F1, the shape creation procedure may be executed based on the new work sectional shape Dn or En obtained in the execution process of the above shape creation procedure. FIG. 11 shows that a part of the inner contour is set to the offset shape from the working cross-sectional shape Dn and the offset is performed (procedure '), and the offset cross-sectional shape is formed into a closed cross-section. (Procedure ') and a case where three-dimensional solid modeling of a stop is created by further performing an extruding process (procedure') in the normal direction by an amount set for each element constituting the cross-sectional shape. In the design constraints in this case, that is, the offset value and the offset shape setting condition, the former is the thickness of the part (eave gutter) to be fitted into the inner part of this part + α, and the latter is the latter. Can be determined by parameterizing each condition and inputting data such as drainage cross-sectional area.

In the case of creating a three-dimensional solid model of a curved joint, the intermediate shape Gn obtained during the execution of the shape creation procedure for the three-dimensional solid modeling of the eave joint is used as the intermediate shape Gn. A corresponding shape creation procedure may be executed. F2 in FIG. 1 and FIG. 12 show this case. The cross-sectional shape serving as the bottom or wall of the part is extracted from the three-dimensional solid model of the intermediate shape Gn, and the extrusion processing (procedure ″) is performed, and the setting is performed. Three-dimensional solid modeling of the bent joint is created by cutout at the cut surface (procedure 6 ''), processing of the detailed part of the part after cutout (procedure ''), and mirror surface processing (procedure).

The basic sectional shape An is shown in FIGS.
As shown in FIG. 3, the parameters and the constraint conditions are registered in advance and called, and the parameters a to j are called.
May be obtained by inputting the value of the above. Further, as shown in FIG. 3, the outer cross-sectional shape of the actual object or the actual model is measured using a contact type or non-contact type three-dimensional measuring device or the like, and the measurement is performed. A value obtained by converting a value into CAD vector data may be used.

The values for the parameters during the above-mentioned shape creation procedure may be input collectively before the execution of the shape creation procedure, but the parameters whose values are not determined during the execution of the shape creation procedure may be used. A configuration may be adopted in which the information is sequentially input in an interactive manner each time it appears. In addition, an intermediate shape Gn of a three-dimensional solid model created in the process of creating a shape of a part and model data of a final shape after the shape creation is input to a tool for performing various analyzes, and analysis results obtained from the tool are input. Update the shape creation procedure by modifying the values of the parameters related to the analysis results in the shape creation procedure of the part and its constraints based on the above, and execute 3D solid modeling according to the updated shape creation procedure. It is possible to perform three-dimensional solid modeling in consideration of the strength and the like, and to optimize the design of the part by repeating a series of these operations.
Note that the data passed to the analysis tool is more preferably the data at the time of the intermediate shape Gn than the final shape. This is because the simpler shape requires less time for analysis.

[0023]

As described above, in the present invention, a procedure for three-dimensional solid modeling of each part of a product composed of a plurality of parts of a certain design is stored as a shape creation procedure, so that a plurality of parts of another design can be stored. Three-dimensional solid modeling of each part of the same kind of product consisting of parts can be performed almost automatically by the above shape creation procedure just by inputting the basic cross-sectional shape in the design. This can greatly reduce the labor and time required for three-dimensional solid modeling when developing.

The three-dimensional solid modeling of another part may be performed from the working sectional shape created during the shape creation by the three-dimensional solid modeling method.
The effort of inputting the basic cross-sectional shape can be omitted, and the time required for executing the procedure can be shortened. Also, from the intermediate shape of the three-dimensional solid model created during the creation of the shape of the part by the three-dimensional solid modeling method,
Furthermore, three-dimensional solid modeling of other parts may be performed. In this case as well, it is possible to save the trouble of inputting the basic cross-sectional shape and further reduce the time required for executing the procedure.

A cross-sectional shape pattern which is registered in advance and whose dimensions and constraint conditions are replaced with variables and parameterized is prepared, and arbitrary values are input to each parameter of the cross-sectional shape pattern as an input cross-sectional shape. A thing may be used. The work of inputting the cross-sectional shape can be reduced. Further, even if the input cross-sectional shape is obtained by using numerical data obtained by measuring the dimensions of the actual or actual model of the part, it is possible to reduce the trouble of inputting the cross-sectional shape and obtain a more preferable cross-sectional shape. It becomes easier.

In creating the shape creation procedure, the procedure in which an operator performs three-dimensional solid modeling of a part in an interactive manner is recorded, and the procedure is arranged for each minimum operation procedure unit, and the operator executes the procedure. If it is created by saving it in a form that can be automatically reproduced at any time and that can be edited in the minimum work unit, an appropriate shape creation procedure can be obtained.

At this time, in the deformation operation of the cross-sectional shape and the basic solid modeling operation defined in the shape creation procedure, the portion that can be numerically controlled is replaced with a variable and parameterized, and the value of this parameter is varied. When the shape creation procedure is updated and three-dimensional solid modeling is performed in accordance with the updated shape creation procedure, parameter input for executing the shape creation procedure can be set to a specific state.

In the operation of deforming the cross-sectional shape and the operation of the basic solid modeling defined in the created shape creation procedure, those in which numerically controllable parts are replaced with variables and parameterized are used. Parameter values are input collectively before the execution of the shape creation procedure, or when the parameter whose value is undetermined appears during execution, the shape creation procedure is determined by interactively inputting the parameter value. It is preferable that a constraint condition is defined by defining a limitation and an association between parameters, and a mathematical expression of the constraint condition is input to uniquely determine a shape creation procedure.

Further, the model data of the intermediate shape of the three-dimensional solid model created during the creation of the shape of a certain part and the model data of the final shape for which the creation of the shape has been completed are input to tools for performing various analyses, and are obtained from the tool. Based on the analysis results, update the shape generation procedure by modifying the parameter values related to the analysis result and the constraints in the shape generation procedure for the part based on the analysis result, and execute 3D solid modeling according to the updated shape generation procedure Then, three-dimensional solid modeling based on the analysis result can be created. In particular, by repeating these series of operations, the design of the corresponding part can be optimized.

[Brief description of the drawings]

FIG. 1 is a flowchart of an example of an embodiment of the present invention.

FIG. 2 is another flowchart of the above.

FIG. 3 is another flowchart of the above.

FIG. 4 is another flowchart of the above.

FIG. 5 is another flowchart of the above.

FIG. 6 is another flowchart of the above.

FIG. 7 is an explanatory diagram at the time of creating (executing) a shape creation procedure.

FIG. 8 is an explanatory diagram at the time of creating (executing) a shape creation procedure.

FIGS. 9A, 9B, and 9C are cross-sectional views showing examples of patterns of input cross-sectional shapes.

FIG. 10 is an explanatory diagram of a database of a shape creation procedure.

FIG. 11 is an explanatory diagram when a shape creation procedure is executed.

FIG. 12 is an explanatory diagram when a shape creation procedure is executed.

FIG. 13 is an explanatory diagram related to input of a cross-sectional shape.

FIG. 14 is an explanatory diagram of a conventional example.

Claims (10)

[Claims] 1. A work procedure for three-dimensional solid modeling of another part based on a cross-sectional shape of a part designed in the past, a part requiring knowledge and experience of a designer is arranged into a work procedure and a cross-sectional shape pattern. The parameterized parameters obtained by replacing the parts that can be numerically controlled with variables are stored in a database as a template for the shape creation procedure of the modeling target part for each cross-sectional shape pattern, and the cross-sectional shape of one base part is requested. Enter the name of the part to be modeled and the value of the parameter in the shape creation procedure, select an appropriate cross-sectional shape pattern similar to the input cross-section shape from the database, select the template for the shape creation procedure, By substituting the value of each parameter, a shape creation procedure for creating a 3D solid model of other parts required from the input cross-sectional shape According to the above-mentioned shape creation procedure, the working sectional shape required for three-dimensional solid modeling of other parts by deforming the input sectional shape is automatically created, and the obtained working sectional shape is Extrusion, sweep, rotation, cutting,
A three-dimensional solid modeling method characterized by generating a three-dimensional solid model of another part by performing a basic solid modeling operation such as mirror copying. 2. A method for performing three-dimensional solid modeling of another part from a working sectional shape created during the shape creation by the three-dimensional solid modeling method according to claim 1. According to the procedure, the working sectional shape of another part is automatically created by deforming the working sectional shape of one part, and the obtained working sectional shape is extruded, swept, rotated, cut, A three-dimensional solid modeling method, wherein a three-dimensional solid model of another part is further generated by performing a basic solid modeling operation such as mirror copying. 3. A method for performing three-dimensional solid modeling of another part from an intermediate shape of a three-dimensional solid model created during the creation of a part shape by the three-dimensional solid modeling method according to claim 1 or 2. And performing a basic solid modeling operation, such as extrusion, sweeping, rotation, cutting, mirror copying, etc., on an intermediate shape of a three-dimensional solid model of a part by the shape creation procedure according to claim 1 or 2, A three-dimensional solid modeling method characterized by generating a three-dimensional solid model of a part. 4. A sectional shape pattern which is registered in advance and parameterized by replacing its dimensions and constraint conditions with variables is prepared, and an arbitrary value is set to each parameter of the sectional shape pattern as an input sectional shape. 3. The three-dimensional solid modeling method according to claim 1, wherein the input is used. 5. The three-dimensional solid modeling method according to claim 1, wherein the input cross-sectional shape is based on numerical data obtained by measuring the dimensions of the actual or actual model of the part. 6. A procedure in which a worker performs three-dimensional solid modeling of a part in an interactive manner is recorded, the procedure is arranged for each minimum work procedure unit, and can be automatically reproduced at any time in the execution order of the worker. The three-dimensional solid modeling method according to claim 1, wherein the shape creation procedure is created by saving the shape in a form that can be edited in a minimum operation unit. 7. In the operation of deforming the cross-sectional shape or the basic solid modeling operation defined in the shape creation procedure according to claim 6, a portion that can be numerically controlled is replaced with a variable and parameterized, and the value of this parameter is changed. A three-dimensional solid modeling method characterized by updating a shape creation procedure by changing the shape, and performing three-dimensional solid modeling according to the updated shape creation procedure. 8. In the operation of transforming a cross-sectional shape or the basic solid modeling operation defined in the shape creation procedure according to claim 6, a part in which numerical control is possible is replaced with a variable and parameterized. Three-dimensional solid modeling characterized by determining the shape creation procedure by inputting the values of each parameter before executing the shape creation procedure or by sequentially inputting interactively when a parameter whose value is not determined during execution Method. 9. An operation for transforming a cross-sectional shape or a basic solid modeling operation defined in the shape creation procedure according to claim 6 in which numerically controllable parts are replaced with variables and parameterized. Constraint conditions are defined by defining the limits of the fluctuation range of the value of each parameter and the association of each parameter, and the shape creation procedure is uniquely determined by inputting the solution of the formula of these constraints. 3D solid modeling method. 10. An intermediate shape of a three-dimensional solid model created during the creation of a shape of a certain part, and model data of a final shape after the creation of the shape is input to a tool for performing various analyses, and obtained from the tool. Based on the analysis results, update the shape generation procedure by modifying the parameter values related to the analysis result and the constraints in the shape generation procedure for the part based on the analysis result, and execute 3D solid modeling according to the updated shape generation procedure 4. The method according to claim 1, wherein
The described three-dimensional solid modeling method.