JP2007172058A - Sheet metal model creation system, sheet metal model creating method and sheet metal model creating program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sheet metal model creation system which can easily recreate a sheet metal model using a computer and which creates a sheet metal model with small quantity of data. <P>SOLUTION: This metal sheet model creation system 1 for creating a geometric model of a metal sheet part comprises a means for creating a two-dimensional middle side model which represents the geometry of a middle side in a completed state of a non-bent portion and a bent portion from design geometric data of the metal sheet part, a means for creating the connection data which represents the connection state of the non-bent portion and the bent portion, a means for creating board thickness data, a means for adding a board thickness to the middle side model and creating a three-dimensional complete state model, a means for adding the board thickness to an expanded state middle side model of the bent portion and creating an expanded state model, a means for accepting selection in which state the bent portion is represented, and a means for connecting any of the models of the bent portion to the model of the non-bent portion based on the selection and creating a model of the selection state. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a sheet metal model creation system and a sheet metal model creation method for creating a shape model of a sheet metal part manufactured by a processing facility including bending using a computer, and a sheet metal model creation program for causing a computer to function as a sheet metal model creation means.

  Sheet metal (thin sheet metal) parts manufactured by processing equipment including bending are usually formed after punching or cutting to form an unfolded sheet metal member, and then bending is performed. Parts are manufactured. The shape of the finished part determined at the design stage is an ideal finished shape, and the developed shape of the sheet metal member is obtained so that this ideal finished shape can be obtained, and the processing conditions such as the mold and bending order in bending are determined. It is necessary to determine.

  In recent years, CAD / CAM has become widespread, and at the design stage, a 3D solid model of a sheet metal part is often created using 3D CAD. Then, a development view is created from the three-dimensional solid model, and a control code for controlling an NC (Numerical Control) processing machine that performs punching and cutting is created. There is also a control code that controls the NC processing machine that performs bending based on the bending process by formulating a bending process such as selecting a mold, bending order, selecting a bending method and a bending machine from the 3D solid model. Created. A three-dimensional solid model of a sheet metal part is stored in a database in association with a development view and bending process data, and is referred to and processed by each department.

Non-Patent Document 1 discloses that a three-dimensional solid model that integrally represents the overall shape of a sheet metal part after bending is created, stored in a database, and referenced and processed by each department.
Murata Machinery Co., Ltd. “Sheet metal CAD / CAM system CAMPATH G4” catalog, published in October 2004

  However, it is necessary to determine the unfolded shape of the sheet metal member so that the ideal completed shape determined at the design stage can be obtained with high accuracy after bending, but the bending mold, bending order, bending method, bending machine Since the amount of elongation at the time of bending differs depending on the bending conditions such as characteristics, it is necessary to correct the developed shape of the sheet metal member by changing the bending conditions. Conversely, the work hardening characteristics change depending on whether the processing for forming the developed shape of the sheet metal member is punching or cutting, and further the processing conditions such as the cutting means of the cutting processing, and the amount of elongation at the time of bending processing Therefore, it is necessary to correct the finished shape model after bending. In recent years, high precision is often required for the size and angle of sheet metal members after bending, and in such cases, final processing conditions are determined through trial and error, especially with respect to various processing conditions. Every time the machining conditions are changed, it is necessary to correct the finished shape model after bending. In addition, the thickness of the material determined at the design stage is strictly different from the actual thickness of the material. To obtain high accuracy, the finished shape model after bending is used as the actual thickness of the material. It will be necessary to change to correct. Thus, even if the sheet metal part manufactured by the processing equipment including the bending process is a three-dimensional solid model that integrally expresses the entire shape after the bending process, the three-dimensional solid model is corrected. Many needs arise. In such a case, even if part of the shape model of the sheet metal part is changed, it is necessary to create a three-dimensional solid model again, so the conventional sheet metal model that represents the entire shape as a whole must be changed. There was a problem that was not easy.

  Furthermore, for example, when there are multiple bending points, a sheet metal model in the middle of the bending process is required in order to confirm that there is no interference between the sheet metal part and the bending machine according to the bending order. There is. However, the conventional sheet metal model represents only a shape model in a specific state, usually a completed state. When a shape model in another state is required, it is necessary to create a three-dimensional solid model again. There was a problem that there was.

  Furthermore, when a sheet metal part has a complicated shape formed by a molding process such as drawing, the shape is represented by a three-dimensional solid model in a conventional sheet metal model. For this reason, the data amount of the sheet metal model increases, and the amount of data processing required to change the viewpoint such as roll, pan, and zoom, and when the shape model itself is rotated and displayed is increased. There was a problem that it took a long time. Further, in the above case, it is avoided that the data amount of the sheet metal model is increased by omitting the molding shape, but since the shape model does not faithfully represent the shape, interference between the sheet metal part and other parts or There was a problem that the sheet metal model could not be used for assembling confirmation.

  The present invention has been made in view of the above problems, and a sheet metal model creation system and sheet metal model creation for creating a sheet metal model with a small amount of data that can be easily recreated using a computer. It is an object of the present invention to provide a method and a sheet metal model creation program that causes a computer to function as sheet metal model creation means for creating such a sheet metal model. Furthermore, the present invention provides a sheet metal model creation system and sheet metal model creation method for creating a sheet metal model that can faithfully represent a shape in the middle of a bending process or a complicated forming shape using a computer, and a computer with such a computer It is an object of the present invention to provide a sheet metal model creation program that functions as a sheet metal model creation means for creating a sheet metal model.

  In order to achieve the above object, the sheet metal model creation system according to claim 1, wherein the sheet metal model creation system that creates a shape model of a sheet metal part manufactured in a processing facility including bending using a computer, Recognize the non-bending part and the bending part of the sheet metal part from the design shape data of the sheet metal part, and express the shape of the intermediate surface in the thickness direction after bending, which is the completed state of the non-bending part and the bending part, respectively. An intermediate surface model generating means for generating an intermediate surface model of a two-dimensional surface data structure; a connector data generating means for generating connector data representing a connecting portion and a phase between the non-bending portion and the bending portion; and the sheet metal Sheet thickness data creating means for creating sheet thickness data representing the sheet thickness of the sheet metal part from the design shape data of the part, and the intermediate surface of the non-bent and bent parts A completed state model creating means for creating a completed state model of a three-dimensional solid model structure that adds the plate thickness to Dell and expresses the shape of the completed state of the unbent portion and the bent portion; and the unfolded state of the bent portion A developed state intermediate surface model creating means for creating an expanded state intermediate surface model of a two-dimensional surface data structure expressing the shape of the intermediate surface in the thickness direction before bending, and the expanded state intermediate surface model of the bending portion An unfolding state model creating means for creating a unfolding state model of a three-dimensional solid model structure that expresses the unfolding shape of the bending portion by adding a plate thickness; and whether the bending portion is in a completed state or unfolding state Selection accepting means for accepting the selection of whether to express in, and based on the state selected by the selection accepting means, the intermediate surface model of the bending part or the intermediate development state A selected state intermediate surface model creating means for connecting any one of the models with the intermediate surface model of the non-bending portion based on the connector data, and creating a selected intermediate surface model; and the selection receiving means Based on the state selected in (1), either the completed state model or the expanded state model of the bent part is connected to the completed state model of the non-bent part based on the connector data. And a selection state model creating means for creating a model.

  The sheet metal model creation system according to claim 2 is the sheet metal model creation system according to claim 1, wherein the two-dimensional surface data expressing the shape of the intermediate surface in the thickness direction in the middle of the bending process, which is an intermediate state of the bending portion. A three-dimensional representation of a halfway state intermediate surface model creating means for creating a halfway state intermediate surface model of the structure, and adding the plate thickness to the halfway state intermediate surface model of the bending portion to express the shape of the halfway state of the bending portion Intermediate state model creating means for creating an intermediate state model of a solid model structure, and the selection receiving means selects whether the bending part is expressed in a completed state, an unfolded state, or an intermediate state The selected intermediate plane model creating means accepts the intermediate plane model, unfolded state or halfway state of the bent portion based on the state selected by the selection accepting means. The intermediate surface model is connected to the intermediate surface model of the non-bending portion based on the connection state indicated by the connection data, and the intermediate surface model of the selected state is created, and the selected state model creating means Based on the state selected by the selection accepting means, either the completed state model, the unfolded state model, or the intermediate state model of the bent portion is selected based on the connection state indicated by the connection data. It is characterized by creating a model in a selected state by connecting with a completed state model.

  The sheet metal model creation system according to claim 3 is the sheet metal model creation system according to claim 2, which recognizes a molding part to be molded other than bending from the design shape data of the sheet metal part, and performs the molding Molding model creation means for creating a molding model of a three-dimensional solid model structure that expresses deformation to the shape of the part, and simple creation of a simple molding model of two-dimensional data structure that abstractly expresses the deformation to the shape of the molding part A forming model creating means, a forming reference data creating means for creating forming reference data indicating an additional reference to the intermediate surface model of the non-bent part or the bent part of the simple forming model, and an additional reference indicated by the forming reference data Forming model editing means for editing the completed state model, the unfolded state model, and the intermediate state model by the forming model; At additional criteria indicated by the position data, the intermediate surface model, is characterized in that to the expanded state intermediate plane model and the middle state intermediate surface model and a simple molding model editing means for performing editing by the simple molding model.

  The sheet metal model creation system according to claim 4 is used in the sheet metal model creation system according to claim 2 or 3, when the material data storage means for storing various data of the material of the sheet metal part and the bending process. Mold data storage means for storing various data of the mold, and the bending estimated when it is hypothesized that bending is performed based on the various data stored in the material data storage means and the mold data storage means Virtual completion state model creating means for creating a virtual completion state model of a three-dimensional solid data structure that represents the shape of the virtual completion state of the part, and the selection receiving means comprises the bending part in a completed state, an unfolded state, When the selection of whether to express in the intermediate state or the virtual completion state is accepted, and the selection accepting unit accepts the selection to express in the virtual completion state To the virtual completion state model generating means is characterized by creating the virtual completion state model.

  The sheet metal model creation system according to claim 5 is the sheet metal model creation system according to claim 4, further comprising processing machine data storage means for storing various data relating to characteristics of the processing machine that performs bending, and the virtual completion state The model creation means creates the virtual completed state model in consideration of various data stored in the processing machine data storage means.

  The sheet metal model creation system according to claim 6 is provided with a bending correction value data storage means for storing various data relating to a bending correction value when performing bending in the sheet metal model creation system according to claim 4 or 5, The virtual completion state model creation means creates the virtual completion state model in consideration of various data stored in the bending correction value data storage means.

  The sheet metal model creation system according to claim 7 is the sheet metal model creation system according to any one of claims 4 to 6, wherein the material data storage means indicates an actual sheet thickness of the material of the sheet metal part. The actual plate thickness data is stored, and the completed state model creating means, the developed state model creating means, and the intermediate state model creating means store the material data in the intermediate surface model, the expanded state intermediate surface model, and the intermediate state intermediate surface model. The virtual finished state model, the unfolded state model, and the intermediate state model are created by adding the plate thickness indicated by the actual plate thickness data stored in the means.

  The sheet metal model creation method according to claim 8, wherein the sheet metal model creation method for creating a shape model of a sheet metal part manufactured in a processing facility including bending using a computer is based on the design shape data of the sheet metal part, An intermediate surface of a two-dimensional surface data structure that recognizes the non-bending portion and the bending portion of the sheet metal part and expresses the shape of the intermediate surface in the thickness direction after bending, which is the completed state of the non-bending portion and the bending portion. From the intermediate surface model creation step of creating a model, the connector data creation step of creating connector data expressing the connection part and phase of the non-bending part and the bending part, and the design shape data of the sheet metal part, A sheet thickness data creation step for creating sheet thickness data representing the sheet thickness of the sheet metal part, and the sheet thickness is added to the intermediate surface model of the unbent and bent parts. A finished state model creating step for creating a finished state model of a three-dimensional solid model structure that represents the shape of the unbent portion and the finished portion of the bent portion, and a plate thickness before bending that is a developed state of the bent portion A development state intermediate surface model creating step of creating a development state intermediate surface model of a two-dimensional surface data structure expressing a shape of a direction intermediate surface, and adding the plate thickness to the expansion state intermediate surface model of the bending portion, An expanded state model creating step for creating a developed state model of a three-dimensional solid model structure that expresses the shape of the expanded state of the bending part, and selection of whether the bending part is expressed in a completed state or an expanded state Based on a selection receiving step for receiving an input and a state selected by the selection receiving means, an intermediate surface model or an intermediate state of the bent portion A selected state intermediate surface model creating step for connecting any one of the models with the intermediate surface model of the non-bending portion based on the connector data and creating an intermediate surface model in a selected state; and the selection receiving unit Based on the state selected in (1), either the completed state model or the expanded state model of the bent part is connected to the completed state model of the non-bent part based on the connector data. And a selection state model creation step for creating a model.

  The sheet metal model creation method according to claim 9 is the sheet metal model creation method according to claim 8, wherein the two-dimensional surface data expressing the shape of the intermediate surface in the sheet thickness direction in the middle of bending, which is an intermediate state of the bending portion. A three-dimensional representation of the intermediate state model creation step of creating the intermediate state model of the intermediate state of the structure, and the intermediate thickness model added to the intermediate state model of the intermediate part of the bending portion to express the shape of the intermediate state of the bending portion An intermediate state model creating step of creating an intermediate state model of the solid model structure, and the selection receiving means selects whether the bending part is expressed in a completed state, an unfolded state, or an intermediate state Receiving, in the selected state intermediate surface model creating step, based on the state selected by the selection receiving means, the intermediate surface model of the bending portion, the unfolded state Is connected to the intermediate surface model of the non-bent part based on the connection state indicated by the connection data, and creates an intermediate surface model of the selected state based on the connection state indicated by the connection data, the selected state model In the creating step, based on the state selected by the selection accepting unit, either the completed state model, the unfolded state model, or the intermediate state model of the bending portion is determined based on the connection state indicated by the connection data. The model is characterized in that it is connected with a completed state model of a bending part and a model in a selected state is created.

  The sheet metal model creating method according to claim 10 is the sheet metal model creating method according to claim 9, wherein the forming part to be formed other than bending is recognized from the design shape data of the sheet metal part, and the forming A molding model creation step for creating a molding model of a three-dimensional solid model structure that expresses deformation to the shape of a part, and a simple to create a simple molding model of a two-dimensional data structure that abstractly expresses deformation to the shape of the molding part. A molding model creation step, a molding standard data creation step for creating molding standard data indicating an additional standard for the non-bent part or the bent part of the simple molding model, and an additional standard indicated by the molding standard data A molding model editing step for editing the completed state model, the unfolded state model, and the intermediate state model by the molding model A simple molding model editing step of editing the intermediate surface model, the unfolded intermediate surface model, and the intermediate state intermediate surface model with the simple forming model according to the additional reference indicated by the forming position data. It is said.

  The sheet metal model creation method according to claim 11 is used in the sheet metal model creation method according to claim 9 or 10, wherein the material data storage means for storing various data of the material of the sheet metal part and bending are performed. A three-dimensional solid that represents the shape of the virtual finished state of the bending portion that is presumed when bending is performed based on various data stored in the mold data storage means for storing various data of the mold A virtual completion state model creation step for creating a virtual completion state model of a data structure, and in the selection receiving step, the bending portion is expressed in a completed state, an unfolded state, an intermediate state, or a virtual completed state And when the selection to be expressed in the virtual completion state is received in the selection input step, the virtual completion state model creation It is characterized by creating the virtual completion state model in step.

  The sheet metal model creation method according to claim 12 is the sheet metal model creation method according to claim 11, wherein in the virtual completed state model creation step, machine data for storing various data relating to characteristics of a machine that performs bending. The virtual completed state model is created in consideration of various data stored in the storage means.

  The sheet metal model creation method according to claim 13 is the sheet metal model creation method according to claim 11 or 12, wherein, in the virtual completed state model creation step, various data relating to a bending correction value when performing bending is stored. The virtual completed state model is created in consideration of various data stored in the bending correction value data storage means.

  The sheet metal model creation method according to claim 14 is the sheet metal model creation method according to any one of claims 11 to 13, wherein the material data storage means indicates an actual sheet thickness of the material of the sheet metal part. Stores actual plate thickness data, and stores the material data in the intermediate surface model, the expanded state intermediate surface model, and the intermediate state intermediate surface model in the completed state model generating step, the expanded state model generating step, and the intermediate state model generating step. The virtual finished state model, the unfolded state model, and the intermediate state model are created by adding the plate thickness indicated by the actual plate thickness data stored in the means.

  The sheet metal model creation program according to claim 15 is a sheet metal model creation program that causes a computer to function as a sheet metal model creation means for creating a shape model of a sheet metal part manufactured in a processing facility including bending. Two-dimensional surface data that recognizes the non-bending part and the bending part of the sheet metal part from the shape data and expresses the shape of the intermediate surface in the thickness direction after bending, which is the completed state of the non-bending part and the bending part. An intermediate surface model creating means for creating an intermediate surface model of the structure, a connector data creating means for creating connector data representing a connection portion and a phase between the non-bending portion and the bending portion, and a design shape of the sheet metal part From the data, sheet thickness data creating means for creating sheet thickness data expressing the sheet thickness of the sheet metal part, and the non-bending and bending part A finished state model creating means for creating a completed state model of a three-dimensional solid model structure that adds the plate thickness to the interface model and expresses the shape of the finished state of the unbent portion and the bent portion; An unfolded state intermediate surface model creating means for creating a unfolded state intermediate surface model of a two-dimensional surface data structure representing the shape of the unfolded state of the intermediate surface in the thickness direction before bending, and an unfolded state intermediate surface model of the bending portion An unfolded state model creating means for creating an unfolded state model of a three-dimensional solid model structure that expresses the unfolded shape of the bent portion by adding the plate thickness to the bent portion, and the bent portion is either in a completed state or unfolded state Selection accepting means for accepting selection of whether or not to express in the state, and based on the state selected by the selection accepting means, an intermediate surface model or a developed state of the bending portion The selected state intermediate surface model creating means for connecting any one of the intermediate surface models with the intermediate surface model of the non-bending portion based on the connector data, and creating the selected intermediate surface model, and the selection Based on the state selected by the accepting means, either the completed state model or the expanded state model of the bent part is connected to the completed state model of the non-bent part based on the connector data and selected. And a selection state model creating means for creating a state model.

  The sheet metal model creation program according to claim 16 is the sheet metal model creation program according to claim 15, wherein the two-dimensional surface data representing the shape of the intermediate surface in the sheet thickness direction during the bending process, which is the intermediate state of the bending portion. A three-dimensional representation of a halfway state intermediate surface model creating means for creating a halfway state intermediate surface model of the structure, and adding the plate thickness to the halfway state intermediate surface model of the bending part to express the shape of the halfway state of the bending part Intermediate state model creating means for creating an intermediate state model of a solid model structure, and the selection receiving means selects whether the bending part is expressed in a completed state, an expanded state, or an intermediate state The selection state intermediate plane model creating means receives the intermediate plane model, the unfolded state or the bent portion based on the state selected by the selection reception means. Based on the connection state indicated by the connection data, any intermediate state intermediate surface model is connected to the intermediate surface model of the non-bent part, and the intermediate surface model in the selected state is created, and the selected state model is created Based on the state selected by the selection accepting unit, the non-bending state of the completed state model, the unfolded state model, or the intermediate state model of the bending portion is determined based on the connection state indicated by the connection data. It is characterized in that it is connected to the completed state model of the part and a model of the selected state is created.

  The sheet metal model creation program according to claim 17 is the sheet metal model creation program according to claim 16, wherein the molding part to be molded other than bending is recognized from the design shape data of the sheet metal part, and the molding is performed. Molding model creation means for creating a molding model of a three-dimensional solid model structure that expresses deformation to the shape of the part, and simple creation of a simple molding model of two-dimensional data structure that abstractly expresses the deformation to the shape of the molding part A forming model creating means, a forming reference data creating means for creating forming reference data indicating an additional reference to the intermediate surface model of the non-bent part or the bent part of the simple forming model, and an additional reference indicated by the forming reference data Forming model editing means for editing the completed state model, the unfolded state model and the intermediate state model by the forming model; A simple molding model editing means for editing the intermediate surface model, the unfolded intermediate surface model, and the intermediate state intermediate surface model with the simple forming model according to the additional reference indicated by the forming position data. Yes.

  The sheet metal model creation program according to claim 18 is used in the sheet metal model creation program according to claim 16 or 17 when material data storage means for storing various data of the material of the sheet metal part and bending. A three-dimensional solid that represents the shape of the virtual completed state of the bending portion estimated when it is assumed that bending has been performed based on various data stored in the mold data storage means for storing various data of the mold Virtual completion state model creation means for creating a virtual completion state model of a data structure, and the selection receiving means expresses the bending portion in any state of a completed state, an unfolded state, an intermediate state, or a virtual completed state When the selection accepting unit accepts a selection to be expressed in a virtual completion state, the virtual completion state model creating unit It is characterized in that to create the virtual complete state model.

  The sheet metal model creation program according to claim 19 is the sheet metal model creation program according to claim 18, wherein the virtual finished state model creation means stores various data relating to characteristics of a processing machine that performs bending. The virtual completed state model is created in consideration of various data stored in the storage means.

  The sheet metal model creation program according to claim 20 is the sheet metal model creation program according to claim 18 or 19, wherein the virtual completion state model creation means stores various data relating to a bending correction value when bending is performed. The virtual completed state model is created in consideration of various data stored in the bending correction value data storage means.

  The sheet metal model creation program according to claim 21 is the sheet metal model creation program according to any one of claims 18 to 20, wherein the material data storage means indicates an actual sheet thickness of the material of the sheet metal part. The actual plate thickness data is stored, and the completed state model creating means, the developed state model creating means, and the intermediate state model creating means store the material data in the intermediate surface model, the expanded state intermediate surface model, and the intermediate state intermediate surface model. The virtual finished state model, the unfolded state model, and the intermediate state model are created by adding the plate thickness indicated by the actual plate thickness data stored in the means.

  According to the sheet metal model creation system according to claim 1, the sheet metal model creation method according to claim 8, or the sheet metal model creation program according to claim 15, the sheet thickness is added to the intermediate surface model of the non-bending part and the bending part. And a completed state model creating means for creating a three-dimensional developed state model by adding a plate thickness to the expanded state intermediate plane model of the bending portion. Therefore, the amount of data can be reduced as compared with the conventional sheet metal model in which a three-dimensional model is created independently for each state. In addition, when creating a three-dimensional sheet metal model by converting viewpoints such as roll, pan, and zoom, and rotating the sheet metal model itself, the conversion is performed on the intermediate plane model and the developed intermediate model. Since it is possible to create a three-dimensional model by adding a plate thickness after it has been performed, the amount of data processing required for conversion can be reduced. In addition, since the selection accepting unit accepts the selection of the state expressing the bending portion, it is possible to create a sheet metal model in the middle of the bending process corresponding to the bending order of the bending process. In addition, since the unbent part and the bent part have independent models, the connector data represents the connection part and phase of these models, so a part of the shape model of the sheet metal part is changed to create a sheet metal model In this case, the sheet metal model can be created by replacing the shape model of the non-bending part or the bending part related to the change. Therefore, a sheet metal model can be easily created as compared with the case where the conventional sheet metal model that integrally expresses the shape of the entire sheet metal part is recreated. In addition, the shape model that expresses the shape of the non-bending part is only in the completed state, and it does not differ depending on whether the bending part connected to the non-bending part is in the completed state or in the unfolded state. Can reduce the amount of data required.

  According to the sheet metal model creation system according to claim 2, the sheet metal model creation method according to claim 9, or the sheet metal model creation program according to claim 16, an intermediate state intermediate state expressing the shape of the intermediate state of the bending portion. The intermediate state model creating means and the intermediate state model creating means for creating the surface model and the intermediate state model, respectively, and the selection accepting means can accept the selection of the state expressing the bending portion. It is possible to create a sheet metal model in an intermediate state, for example, when processing by a plurality of bends.

  According to the sheet metal model creation system according to claim 3, the sheet metal model creation method according to claim 10, or the sheet metal model creation program according to claim 17, a sheet metal model including a three-dimensional model of a forming part is required. In such a case, a sheet metal model expressing the molding part in three dimensions can be created. On the other hand, when it is not necessary to create such a sheet metal model, the data required for creating the sheet metal model is expressed by abstractly expressing the molding part in two dimensions, compared to the case of expressing in three dimensions. The amount can be reduced. In addition, when creating a three-dimensional sheet metal model with viewpoint conversion such as roll, pan, zoom, etc., or conversion such as rotation of the sheet metal model itself, the conversion is performed on the intermediate plane model, the developed intermediate model, etc. Since it is possible to add a three-dimensional model of the molded part after performing the above, it is possible to reduce the amount of data processing necessary for the conversion.

  According to the sheet metal model creation system according to claim 4, the sheet metal model creation method according to claim 11, or the sheet metal model creation program according to claim 18, the bending estimated when it is assumed that bending is performed is assumed. Since the virtual completed state model creating means for creating the virtual completed state model of the part is provided, it is possible to create a sheet metal model that expresses the shape of the sheet metal part obtained by actual bending with higher accuracy. Moreover, since the virtual completion state model creation means creates a virtual completion state model based on various data stored in the material data storage means and the mold data storage means, machining simulation and actual machining by a combination of material and mold Since it is possible to consider the bending characteristics of actual materials and dies, such as creating a virtual completion model from data, the shape of sheet metal parts obtained by actual bending can be expressed with higher accuracy A sheet metal model can be created.

  According to the sheet metal model creation system according to claim 5, the sheet metal model creation method according to claim 12, or the sheet metal model creation program according to claim 19, the virtual completed state model creation means is used for actual bending. In order to create a virtual finished state model in consideration of various data related to the characteristics of the processing machine used, it is possible to create a sheet metal model that expresses the shape of the sheet metal part obtained by actual bending with higher accuracy. it can.

  According to the sheet metal model creation system according to claim 6, the sheet metal model creation method according to claim 13, or the sheet metal model creation program according to claim 20, the virtual completed state model creation means is based on an experiment or theory. In order to create a virtual finished state model in consideration of various data related to bending correction values such as the obtained correction formula and correction coefficient, a sheet metal that represents the shape of the sheet metal part obtained by actual bending with higher accuracy A model can be created.

  According to the sheet metal model creation system according to claim 7, the sheet metal model creation method according to claim 14, or the sheet metal model creation program according to claim 21, the sheet thickness expressed by the actual sheet thickness data is added. Since the completed state model, unfolded state model and intermediate state model are created, a sheet metal model can be created with the actual sheet thickness of the sheet metal part material as the sheet thickness, and the shape of the sheet metal part can be made with higher accuracy. A sheet metal model can be created.

  A sheet metal model creation system according to an embodiment of the present invention or a sheet metal model creation system to which a sheet metal model creation method and a sheet metal model creation program according to an embodiment of the present invention are applied will be described with reference to the drawings. As shown in the block diagram of FIG. 1, the hardware configuration environment for executing the sheet metal model creation system 1 includes one or more terminal devices 2, the terminal devices 2 and a LAN (Local Area Network) 3. And a server device 4 that can communicate with each other. The server device 4 stores, as a database, an application server 5 that provides various processes related to the sheet metal model, data representing the sheet metal model (hereinafter referred to as “sheet metal model data”), and a set of data related to the sheet metal model. It comprises a database server 6 to be managed. Each of the terminal device 2, the application server 5, and the database server 6 is a computer. The sheet metal model creation system 1 executes a sheet metal model creation program P1, P2 (see FIGS. 2 and 3), thereby causing a plurality of computers connected via the LAN 3 to function as a shape model creation means, thereby making a sheet metal model. Create. Note that the communication network is not limited to the LAN 3 and may be a wireless or wired communication network that includes a mobile terminal network, a public network, a dedicated network, an Internet network, an intranet network, and the like. Furthermore, you may comprise the terminal device 2, the application server 5, and the database server 6 from one computer.

  The terminal device 2 is an information terminal device installed in a design department, a production process creation department, a punching department, a cutting department, a bending department, a general processing department for sheet metal parts including welding and tapping, an inspection department, etc. As a computer. As shown in FIG. 2, the terminal device 2 includes a CPU (Central Processing Unit) 11 that performs all processes such as input / output processing and program execution for the terminal device 2, and a system for controlling the entire terminal device 2. A ROM (Read Only Memory) 12 in which a program and the like are stored, a RAM (Random Access Memory) 13 for temporarily storing calculation processing results by the CPU 11, setting information of various operations of the apparatus, and the sheet metal model according to the present invention A program memory 14 in which various application programs including a sheet metal model creation program P1 constituting a part of the creation program are stored, and a LAN I / F (Local Area Network Interface) 15 for connection to the LAN 3; Each unit 11 to 15 is connected via a bus 16. Further, the terminal device 2 is stored in a storage medium such as a display means such as a CRT (Cathode-Ray Tube) or a liquid crystal display, an input means such as a keyboard or a mouse, an output means such as a printer or a plotter, a magnetic tape, an optical disk, or a flexible disk. A storage medium connection means for storing data or reading data from the storage medium is provided as required by each department. Communication processing with the server device 4 in the terminal device 2 is performed by the CPU 11 executing a known client application program stored in the program memory 14. The terminal device 2 may be an independent information terminal device such as a personal computer or a workstation, or may be an information terminal device constituting a part of an interface system or a control system of a processing machine.

  The program stored in the program memory 14 is described in a markup language such as HTML in addition to a high-level procedural programming language, an object-oriented programming language, an assembly language, and a machine language. In such a realization method, the program memory 14 constituted by a hard disk, a magneto-optical disk, an optical disk, a CD-ROM, a CD-R, a magnetic tape, a nonvolatile memory card, a ROM or the like is used as a computer-readable storage medium. Function.

  The application server 5 includes a presentation logic unit (hereinafter referred to as a PL unit) 5a that displays a screen for displaying and inputting a sheet metal model on the terminal device 2, and processing functions such as sheet metal model creation of the sheet metal model creation system 1. A sheet metal model logic unit (referred to as ML unit) 5b, a flow control unit (hereinafter referred to as FC unit) 5c that performs call control of the PL unit 5a and ML unit 5b, and data access to access the database server 6 Part (hereinafter referred to as DA part) 5d.

  The PL unit 5a holds a display attribute file configured to include display attribute information used when displaying a menu screen, an input screen, a processing result display screen, and the like, and based on an instruction from the terminal device 2, A process of returning the display attribute information to the terminal device 2 is performed. The ML unit 5b performs various processes related to the sheet metal model such as creating sheet metal model data based on an instruction from the terminal device 2, and inputs the sheet metal model data and the like to the database server 6 to the DA unit 5d. Processing for instructing update, search, and extraction, and returning the access result to the database server 6 to the terminal device 2 is performed. The FC unit 5c performs processing for calling the PL unit 5a and the ML unit 5b in response to an instruction from the terminal device 2. The DA unit 5d performs processing related to access to the database server 6 such as connection and disconnection with the database server 6, creation / execution of a query, input and change of sheet metal model data to the database server 6, and the like.

  The database server 6 includes a sheet metal model database 6a for storing sheet metal model data, a material database (material data storage means) 6b for storing material data related to sheet metal materials such as sheet thickness, length, width, and tensile strength of sheet metal materials. Mold database (mold data storage means) 6c for storing mold data related to the mold such as various dimensions of the mold, allowable load and applicable construction method, bending machine, punching machine, cutting machine including cutting machine A processing machine database (processing machine data storage means) 6d for storing processing machine data relating to the characteristic data of the machine, bending correction value data obtained through experiments, etc., and data such as correction formulas and correction coefficients for calculating the bending correction values. A bending correction value (elongation value) database (bending correction value data storage means) 6e is provided.

  In response to a processing request from the DA unit 5d, the database server 6 performs processing such as storage and retrieval of sheet metal model data on the databases 6a to 6e.

  An example of the hardware configuration of the application server 5 and the database server 6 is shown in FIG. Each of the application server 5 and the database server 6 includes a CPU 21 that controls the entire apparatus, a ROM 22 that stores a system program for controlling the entire apparatus, calculation processing results by the CPU 21, setting information for various operations of the apparatus, and the like. Are temporarily stored, a program memory 24 in which various application programs including a sheet metal model creation program P2 constituting a part of the sheet metal model creation program according to the present invention are stored, and a LANI for connection to the LAN 3 / F25. Furthermore, the database server 6 includes a data memory 26 configured by a large-capacity hard disk or the like that stores data related to the sheet metal model including sheet metal model data, material data, mold data, and processing machine data. These units 21 to 26 are connected via a bus 27. Specifically, a general-purpose computer such as a personal computer or a workstation can be suitably used as the application server 5 or the database server 6, but other than that, a dedicated computer designed exclusively for the sheet metal model creation system 1 can be used. It can also be used. The application server 5 and the database server 6 may be configured as one server device. Furthermore, the application server 5 may be configured by a plurality of server devices.

  Further, the management processing of the databases 6a to 6e in the database server 6, the access processing of the database server 6 by the application server 5 and the communication processing with the terminal device 2 are for well-known database servers and application servers stored in the program memory 24. This is performed by the CPU 21 executing the application program.

  The program stored in the program memory 24 is described in a markup language such as HTML in addition to a high-level procedural programming language, an object-oriented programming language, an assembly language, and a machine language. In such a realization method, the program memory 24 constituted by a hard disk, a magneto-optical disk, an optical disk, a CD-ROM, a CD-R, a magnetic tape, a nonvolatile memory card, a ROM, etc. is used as a computer-readable storage medium. Function.

  Further, as shown in FIG. 1, the sheet metal model creation system 1 stores a design database server 7 that stores and manages a set of design data in a design stage consisting of a three-view drawing, a development view, three-dimensional solid data, etc. relating to a sheet metal part. May be connectable via the LAN 3.

  In the sheet metal model creation system 1, the CPU 11 reads out and executes the program code from the program memory 14 storing the program code of the sheet metal model creation program P 1 in the terminal device 2 (see FIG. 2), and the server device 4 in the sheet metal. The CPU 21 reads out and executes the program code from the program memory 24 storing the program code of the model creation program P2 (see FIG. 3), and performs processing such as creation of a sheet metal model. Specifically, for example, in the sheet metal model creation system 1, the server device 4 is designed according to an instruction input from the terminal device 2 and is stored in the design data input from the terminal device 2 or the design database server 7. A process for creating sheet metal model data from the data and storing it in the sheet metal model database 6a, obtaining sheet metal model data from the sheet metal model database 6a, and modifying the obtained sheet metal model data to make corrections, replacements, deletions, etc. Processing to store in the model database 6a, processing to acquire sheet metal model data from the sheet metal model database 6a, send the acquired sheet metal model data to the terminal device 2, and display the sheet metal model on the terminal device 2 according to the display attribute information. Do. The sheet metal model creation program according to the present invention is a program for performing various processes related to the creation of sheet metal model data such as a program for creating sheet metal model data from design data. The sheet metal model creation system 1 is connected to the terminal device 2 and the server device 4. It has sheet metal model creation programs P1 and P2 (see FIGS. 2 and 3) for execution.

  Next, a sheet metal model creation system according to an embodiment of the present invention, or an object-oriented sheet metal model processed by a sheet metal model creation system to which a sheet metal model creation method or a sheet metal model creation program according to an embodiment of the present invention is applied is illustrated in the drawings. This will be explained based on. The object-oriented sheet metal model (hereinafter, simply referred to as “sheet metal model”) 30 is a model in which sheet metal parts are abstracted based on object orientation. FIG. 4 shows a class diagram (UML diagram) and FIG. 5 shows an object diagram. As shown, the shape of the sheet metal part is disassembled and expressed.

  In the sheet metal model 30, independent sheet metal parts are represented by a part object 101 belonging to the part class 31, and the part object 101 includes a part that defines a shape model that models the shape of the sheet metal part, such as phase and geometry, It consists of parts that define data other than shape, such as processing information of processing, cutting processing and bending processing (hereinafter collectively referred to as “sheet metal processing”) and material data of sheet metal parts. The shape model represented by the component object 101 is represented by a connected part object 102 belonging to the connected part class 32. The connected part object 102 is a collection of part objects representing planes and connector objects 104 representing these connections. As shown in FIGS. 6A and 6B, the part class is a surface part class to which a surface part object 105 representing a surface part (non-bent part) whose shape does not deform before and after bending is to belong. 35, or a bending part 36 to which a bending part object 106 representing a bending part (bending part) whose shape is deformed belongs. That is, the part object is either the surface part object 105 or the bent part object 106.

  As shown in FIGS. 7A to 7C, the sheet metal model 30 is a shape that expresses three types of states: a developed state 30a, a completed state 30b, and an intermediate state 30c according to the state of the shape of the bent part. Has a model. There is no concept of “current state” in the sheet metal model, and the sheet metal models 30a to 30c in any state can be obtained from the terminal device 2 at any time, and the sheet metal models 30a to 30c in different states can be displayed simultaneously. Is possible. As shown in FIG. 7A, the unfolded state 30a is a state in which all the bending portions 36 constituting the sheet metal model 30 are unfolded, and expresses a flat plate shape before bending. As shown in FIG. 7B, the completed state 30b is a state in which all the bending surfaces 106 (the curved surfaces represented by the bending part object 106) constituting the sheet metal model 30 are bent, Represents the shape after processing is completed. The intermediate state 30c is a state that can be formed in the bending process, as shown in FIG. 7C, for example, and includes an unfolded shape, a bent shape, and a bent portion 106 having a bent shape. Express the state to be. The intermediate state 30 c of the sheet metal model can express various shapes, and at least one intermediate state is expressed in the sheet metal model 30.

  As shown in FIG. 4, the component class 31 is a top-level class that represents a sheet metal model 30 of a sheet metal component, and is not only a shape model of the sheet metal component but also a component other than the sheet metal component but related to the sheet metal component. The reference figure that expresses, machining quality, part attributes, machining information, etc. are also collected. The part class 31 includes a connection part class 32 that represents the shape of an actual sheet metal part, a reference figure class 37 that represents a reference figure, a machining quality class 38 that represents machining quality, and a part attribute class that represents part attributes of the sheet metal part. 39, the processing information class 40 expressing the processing information of sheet metal processing is collected. The component class 31 has a method for acquiring a material and a plate thickness. The component class 31 has methods such as a method for checking interference between the connected part objects 102, a method for checking interference with other components represented by the reference graphic class 37, and a method for moving and rotating the component. Further, when the part class 31 gives the bending state including before and after the bending process, the shape model corresponding to the bending state is selected by selecting the data of the bending part object 106 according to the bending state. It has a method that returns Thereby, a plurality of sheet metal models 30 in different bending states can be acquired at the same time.

  The connected part object 102 constituting the part object 101 represents a sheet metal part that can be finally developed into one developed shape. However, the part class 31 has a method for connecting the connection part object 102 and a method for separating the connection part object 102, and a sheet metal model of a plurality of sheet metal parts in which the connection part object 102 is developed into a plurality of developed shapes. It is temporarily allowed to express. Thereby, an operator can perform trial examination, such as whether the bending part 106 is formed by a bending process or is formed by butt | matching.

  The connected part class 32 is a class composed of a set of part objects that are physically and continuously connected by the connector object 104, and is a unit that is developed into a single flat developed shape when the sheet metal is developed. Represents a shape model of a sheet metal part. A part object 101 having a plurality of connected part objects 32 has a plurality of developed shapes, and represents a plurality of sheet metal parts. The connection part class 32 has a method for acquiring connection data such as a reference part that is a part serving as a starting point for constructing the shape of the connection part. The connected part class 32 has methods such as a method for checking whether there are a plurality of paths connecting arbitrary parts, a method for checking whether a path connecting arbitrary parts exists, and a method for performing a self-interference check. A method that checks whether there are multiple paths that connect between arbitrary parts. If such a path exists, the sheet metal part to be expressed cannot be developed in a planar shape, and is not established as a sheet metal part. Can be determined. A method that checks whether there is a path that connects between arbitrary parts. If such a path does not exist, the sheet metal part to be expressed is composed of a plurality of developed shapes, so it is determined that the sheet metal part is not established. be able to.

  The part class 34 is an abstract class for expressing the shape model of the sheet metal model 30, and the actual shape model is defined by a surface part class 35 or a bending part class 36 which is a derived class (lower class). The part class 34 is a method for obtaining an arrangement matrix that expresses how the shape model expressed in each coordinate system in the surface part class 35 and the bending part class 36 is transformed and arranged in the display space. Have The arrangement matrix is a matrix that expresses any one of congruent transformations including parallel movement, rotational movement, and combined movement thereof.

  As shown in FIGS. 7A to 7C, the sheet metal model 30 has three states, an unfolded state 30a, a completed state 30b, and an intermediate state 30c. The shape expressed by deforms. The shape expressed by the surface part object 105 does not change between the states, but the shape expressed by the bending part object 106 is a shape that is not bent in the unfolded state 30a, a shape that is bent in the completed state 30b, and a shape that is bent in the intermediate state 30c. It changes with an arbitrary shape during the bending process. An intermediate state is a state in which each bending part is not bent, is in a bent state, is in a process of bending, can be specified in an arbitrary shape, and can be specified arbitrarily The shape is implemented with deformation information. In the intermediate state 30c shown in FIG. 7 (c), one bending surface 106 is not bent, the other bending surface 106 is bent, and the bending surface 106 is bent. The intermediate state where only processing is completed is expressed. In this way, when there are a plurality of bending surfaces 106, the intermediate state according to the bending processing order of each bending surface 106 can be expressed, so the bending processing order, the interference at the time of bending processing, etc. Becomes easy.

A plurality of bending processes may be performed on the same bending surface. Moreover, the bending state in the middle of the bending process with respect to the same one bending surface may be required for examination of interference or the like. For example, in the case of hemming processing (border processing), the bending surface 106 cannot be bent to the final target angle by one bending operation, so the bending surface 106 is moved twice from the developed state shown in FIG. Through the bending process, it reaches a state where it is bent by the final target angle after the completion of the bending process shown in FIG. In the process of bending twice, the bent state is a predetermined angle in the middle of the first bending process shown in FIG. 8B, or the first bending process after the first bending process shown in FIG. 8C. It has been bent by the target angle at. Each state of the bending surface 106 shown in FIGS. 8A to 8D is expressed as an intermediate state 1 to an intermediate state 4, respectively.

(Adding a paragraph by dividing paragraph 0057)
In the case of flax bending (twice bending), when the sheet metal part is molded from the unfolded state shown in FIG. 9 (a) to the bent state shown in FIG. 9 (e), it is shown in FIG. 9 (b). As described above, when the bending surface 106a is bent after the bending surface 106b is bent to the final target angle, the mold and the sheet metal part indicated by the two-dot chain line in the drawing interfere with each other. Therefore, as shown in FIG. 9C, the bending surface 106b is once bent to a predetermined angle so that the mold and the sheet metal part do not interfere with each other in the first bending step. Thereafter, as shown in FIG. 9 (d), the bending surface 106a is bent to the final target angle in the second bending step, and then the bending surface 106b is set in the third bending step as shown in FIG. 9 (e). Bend to an angle. As described above, the bending surfaces 106a and 106b of the sheet metal part undergo the bending process three times from the unfolded state shown in FIG. 9A, and reach the state after the bending process shown in FIG. 9E. Therefore, the states of the bent surfaces 106a and 106b shown in FIGS. 9A and 9C to 9E are expressed as intermediate state 1 to intermediate state 4, respectively.

(Adding a paragraph by dividing paragraph 0057)
Further, in the case of bending back processing, when the sheet metal part is molded from the unfolded state shown in FIG. 10A to the bending completed state shown in FIG. 10F, as shown in FIG. When the bending surface 106e is bent after bending to the final target angle, the mold and the sheet metal part indicated by the two-dot chain line in the figure interfere. Therefore, as shown in FIG. 10 (c), a surface that is not bent in the bending process completed state is a bending surface 106d, and is bent once to a predetermined angle in the first bending step. After that, as shown in FIGS. 10D and 10E, the bending surface 106e is bent to the final target angle in the second bending step, and the bending surface 106c is bent to the final target angle in the third bending step. ), The bending surface 106d is bent back in the fourth bending step. As described above, the bending surfaces 106c, 106d, and 106e of the sheet metal part undergo the bending process of 4 degrees from the unfolded state illustrated in FIG. 10A, and reach the after-bending state illustrated in FIG. 10F. Therefore, the states of the bending surfaces 106c, 106d, and 106e shown in FIGS. 10A and 10C to 10F are expressed as the intermediate state 1 to the intermediate state 5, respectively. As shown in FIG. 10 (f), the bending surface 106e represents a surface that is not bent in the bending completed state, but the bending surface 106e in the intermediate state 5 shown in FIG. 10 (f) is 2 degrees. Since elongation occurs due to bending and bending back by bending, it is different from the bending surface 106e in the intermediate state 1 shown in FIG.

  The part class 34 is a method (intermediate surface model creating means, unfolded state intermediate surface model creating means, intermediate state) that acquires intermediate surface sheet bodies (intermediate surface objects, intermediate surface models) 107 to 109 representing the geometric shape of the shape model. Intermediate plane model creating means). As shown in FIG. 11, the intermediate sheet bodies 107 to 109 are two-dimensional surface models having no thickness that represent intermediate surfaces in the sheet thickness direction of the sheet metal model. From the deformation state intermediate sheet body (expanded state intermediate surface model) 107 expressing the shape of the intermediate surface in the expanded state based on the deformation information acquired by the deformed geometric class 41 (see FIG. 4) collected by the bending part class 36, A completed state intermediate sheet body (completed state intermediate surface model) 108 and an intermediate state intermediate sheet body (intermediate state intermediate surface model) 109 that respectively represent the shapes of the intermediate surface in the completed state and the intermediate state are created.

  The part class 34 is a method for acquiring a connector object 104 connected to its own part, a method for acquiring another part object connected to its own part, and a specified part connected to its own part. There are also methods such as a method for acquiring a part on the other side of the object and a method for searching for a path that reaches the specified part.

  The connector class 33 is a class that represents a connection between parts, and a connector object 114 that represents a connected part and a side to which the part is connected (hereinafter referred to as “connection edge”) belongs. As shown in FIG. 12 (a), the connector class 33 is used as a connector data creation means, one connected part object 110, the other connected part object 111, the part object. A method for obtaining an array of 110 connection edges 112 and an array of connection edges 113 of the part object 111; The connection edges 112 and 113 are ridge lines with respect to the part object 110 and the part object 111 where the connector object 114 expresses the connection, and it is necessary that at least one of the connection edges 112 and 113 exist. The child object 114 has connection edges 112 and 113 in an array. Further, the connection edges 112 and 113 held by the connector object 114 must be on a straight line. Even when the connected part objects 110 and 111 and their connection edges 112 and 113 are defined, the connection of the part may not be uniquely determined. Therefore, as shown in FIG. 12B, a surface direction is defined on the surface represented by each part object 115 to 117, and the connection of the part represented by the connector object 114 is connected to the part object 115 and the part. A distinction is made between a forward connection in which the surface directions of the connected surfaces coincide as in the surface represented by the object 116 and a reverse connection in the opposite direction as in the surface represented by the part object 116 and the part object 117. . Therefore, the connector class 33 has a method for acquiring a value indicating the connection direction between the part and the part, that is, the forward connection or the reverse connection so that the connection between the part and the part is uniquely determined. .

  The surface part class 35 (see FIG. 4) represents a shape model of a part that is not deformed by bending, and the surface part object 105 (see FIG. 5) belongs to it. The main data of the plane object 105 belonging to the plane part class 35 is an intermediate plane sheet body 107 that represents the geometric shape of the intermediate plane in the plate thickness direction, as shown in FIG. The surface part class 35 has a method for acquiring the intermediate surface sheet body 107 expressing the geometric shape of the intermediate plane in the thickness direction of the surface part. The surface part class 35 has a method such as a method of creating a three-dimensional solid body (three-dimensional shape object) by extruding half of the plate thickness from the intermediate surface sheet body 107. Since the parts expressed by the face part class 35 have the same shape in each of the developed state, the completed state, and the intermediate state, the intermediate face sheet body 107 and the three-dimensional solid body are common in each state.

  The bending part class 36 is a class that represents a shape model of a part that is deformed by bending, and a bending part object 105 (see FIG. 5) belongs to it. As shown in FIG. 4, the bending part class 36 is a collection of deformed geometric classes 41 that represent specific shapes of deformation. The deformation geometry includes a cylindrical deformation, a conical deformation, a composite deformation in which these deformations are combined, etc., depending on the type of deformation to be expressed. As shown in FIG. 13A and FIG. 13B, the bending portion class 36 includes a fixing line 120F of the intermediate sheet body 120, one end line 120A of the intermediate sheet body 120, and an intermediate sheet. A moving matrix expressing where the other end line 120B, end line 120A and end line 120B of the body 120 move when completed, and where the end line 120A and end line 120B move when halfway Has a method for acquiring a movement matrix or the like that expresses each. Here, the fixed line 120F is a straight line that is perpendicular to the extending direction and does not change its position before and after bending deformation, and the end lines 120A and 120B are boundary lines (straight lines) that are perpendicular to the extending direction.

  The main data of the bending part object 105 belonging to the bending part class 36 is the unfolded intermediate sheet body. As shown in FIG. 11, in order to obtain the shapes of the intermediate sheet bodies 108 and 109 in the complete state or the intermediate state. Therefore, it is necessary to perform reverse expansion calculation from the intermediate sheet body 107 in the expanded state. The reverse expansion calculation is performed in the coordinate system in which the intermediate sheet body is expressed, and the fixed line does not change due to the reverse expansion, and the end line moves by receiving coordinate conversion. The coordinate transformation received by the end line is equal to the coordinate transformation acting on the end line that coincides with the end line of the adjacent part (bending part or surface part). The bending part class 36 has a method for acquiring a coordinate transformation matrix expressing this coordinate transformation.

  The deformed geometric class 41 is an abstract class that defines what shape (geometric shape) the bent part is deformed, and creates a shape figure in a completed state or an intermediate state of the bent part. As shown in FIG. 4, the specific shapes of the unfolded state, the completed state, and the intermediate state are combined with a cylindrical deformation class 42 that represents deformation into a cylindrical shape, and a conical deformation class 43 that represents deformation into a conical shape. Further, it is defined by a derived class (lower class) composed of a composite deformation class 44 expressing a plurality of deformations. The deformed geometry class 41 is a method for obtaining a value indicating the state of the bending portion, that is, any state that matches the unfolded state, matches the completed state, or does not match the shape of the unfolded state and the shape of the completed state. It has a method to get a value indicating that Further, as shown in FIG. 11, the deformed geometry class 41 is a method for creating a completed three-dimensional solid body 108a by extruding half of the plate thickness from the completed intermediate sheet body 108 halfway. A method of creating a three-dimensional solid body 109b in an intermediate state by extruding half of the plate thickness from the intermediate sheet body in a state, and a movement matrix expressing where the end line moves when it is in a completed state and an intermediate state Each has a method such as a method to calculate.

  The cylindrical deformation class 42 is one of classes that define a specific deformation of the deformation geometry of the bending part, and expresses a cylindrical deformation. Bending with a general press brake machine is expressed as a cylindrical deformation. The shape of the cylindrical deformation is determined by specifying the bending angle and the bending radius at the intermediate surface. The shape in the middle of the deformation of the cylinder is determined by specifying the bending angle.

  The length of the intermediate surface is generally different between the unfolded state before the cylinder deformation and the completed state after the cylinder deformation, and the intermediate surface length is also the unfolded state and the completed state in the middle of the middle of the cylinder deformation. It differs from the length of the intermediate surface. The length (arc length) of the intermediate surface in the completed state or midway is determined from the bending angle and the bending radius. The elongation value of the intermediate surface in the completed state or the intermediate state is calculated from the difference obtained by subtracting the length of the intermediate surface in the developed state from the length of the intermediate surface in the completed state or intermediate state. In an actual bending process, the elongation value varies depending on the material material, plate thickness, mold, processing machine, processing method, and the like. Therefore, the cylindrical deformation class 42 may include a method for acquiring a correction value for correcting the elongation value using these. For example, correction values stored in the bend correction value database 6e (see FIG. 1) in association with materials, molds, etc., and corrections stored in a table (not shown) in which materials, molds, etc. are associated with each other. The cylindrical deformation class 42 may have a method for acquiring a value. And when acquiring the correction value stored in the bending correction value database 6e, the cylindrical deformation class 42 may have a function of inquiring the bending correction value database 6e, or a function of inquiring the bending correction value database 6e outside. The cylindrical deformation class 42 may include a method that can set the function. In addition, you may determine the shape of an intermediate state by designating an elongation value instead of a bending angle.

  The shape of the bent portion in the middle state is not necessarily a shape between the shape in the developed state and the shape in the completed state. For example, as shown in FIGS. 14 (a) to 14 (c), when expressing a shape model of a bending portion 121 of bending work with springback, the springback state expressed as an intermediate state is more than the completed state. It is necessary to express as a state where the bending angle is increased. In this case as well, the intermediate shape can be determined by specifying the bending angle and the length of the intermediate surface.

As shown in FIG. 4, a cylindrical split deformation class 45 is derived from the cylindrical deformation class 42. This cylindrical division deformation class 45 expresses a deformation in which a cylindrical shape is divided into a plurality of times and bent. The split bending by the cylindrical split deformation is expressed as a cylindrical deformation in which a bending radius is specified for each region obtained by equally dividing the end line of the bent portion into a plurality of parts. In the case of three-division bending in which the bending part 122 is divided into three parts, as shown in FIG. 15A, three regions R0 to R2 are obtained by dividing the end lines 122A and 122B of the bending part 122 into three equal parts. It is divided into. As shown in FIG. 16B, when the bending angle of the cylindrical deformation is 90 degrees, the bending angles of the regions R0 to R2 are 90/3 = 30 degrees. Thus, there are only 2 ^N types of shapes at the stage where the intermediate process of divided bending is completed depending on the order of bending each region obtained by dividing the bending portion into N parts. In this case, as shown in FIGS. 16 (a) to 16 (d), this shape is a combination of the states of the regions R0 to R2 (0: not bent, 1: bent). It can be specified by the state string (the state of the region R0, the state of the region R1, the state of the region R2). In the cylindrical split deformation class 45, as a method for specifying the intermediate state, there are two kinds of methods expressed by the cylindrical deformation class 42 in addition to the above-described methods, and these can be specified at the same time. For example, in the case where the bending portion 123 is bent to 90 degrees by three-division bending, as shown in FIG. 17, the number of divided bends, the state string of divided bending, the attention area, and the bending angle of the attention area are specified. The shape of the intermediate state is determined.

  The compound deformation class 44 is a class that expresses a plurality of deformations combining cylindrical deformation, conical deformation, and the like, and a step bending deformation class 46 is derived as shown in FIG. The step bending deformation class 46 includes two cylindrical deformations 130 and 131 as shown in FIG. 18A, and two cylindrical deformations 132 and 133 and one fixed deformation 134 as shown in FIG. 18B. It is a class that expresses the step bending deformation combining. The fixed deformation class 47 is derived from the deformed geometry class 41 and represents a deformed geometry that is not deformed, as shown in FIG. The fixed deformation class 47 represents a fine gap that does not deform in the step bending deformation as a part of the deformation geometry constituting the composite deformation.

  From the part class 34, as shown in FIG. 4, an attached sketch figure class 48 is aggregated to represent a hole shape, a molded shape, and the like. The attached sketch figure class 48 aggregates attached sketch figures included in the part. The attached sketch figure represents an attached figure that represents a hole shape, a molded shape, or the like on a sketch plane having the same coordinate system as the intermediate plane of the part. Usually, in the three-dimensional solid model, the hole shape and the molded shape are faithfully expressed by a method such as boundary representation (B-Rep). On the other hand, in the present sheet metal model, the hole shape and the molded shape are not expressed by the boundary expression, but are expressed by the attached sketch graphic object 144 included in the part object, as shown in FIG. The attached sketch figure class 48 has a method for acquiring the coordinate system of the sketch plane, and this coordinate system is a coordinate in which the shape of the intermediate sheet body of the aggregation destination part object (plane part object 145) is expressed. It is consistent with the system.

  The attached sketch figure class 48 is a point body that expresses a point figure, a wire body that expresses a line figure, a sheet body that expresses a molded shape such as a drawing as a plane figure, and a three-dimensional figure that expresses a molded shape as a three-dimensional figure. It has a method for acquiring an attached sketch figure consisting of graphic elements such as a solid body. For example, the hole shape of the sheet metal model is represented by an attached sketch figure as a wire body that is closed and does not self-intersect. The attached sketch graphic class 48 includes a method for generating a maximum of six types of attached sketch graphic as needed for both simple display and detailed display in each of the completed state, the unfolded state, and the intermediate state.

  As shown in FIG. 4, the attached sketch graphic class 48 is a collection of attached graphic classes 49. The attached figure class 49 is a class that represents attached figures that are collected on the attached sketch plane. The attached figure class 49 mainly represents shapes related to punch press hole processing such as a forming shape and a hole shape, and includes an attached forming figure class 50, an attached wire figure class 52, an attached grid pattern figure class 53, and an attached arc shape. It becomes a base class such as the pattern graphic class 54. A shaping shape such as a drawing shape is specifically expressed in an attached shaping figure class 50 derived from the attached figure class 49. The attached graphic class 49 is merely an interface rather than a class because it only defines the methods necessary for the attached graphic that is indirectly aggregated in the part. An actual attached figure such as an attached figure is derived from the attached figure class 49, and the attached figure class 49 implements an attached figure interface.

  When the aggregation destination part object of the attached figure is expressed by the intermediate sheet body, as shown in FIG. 20, the attachment expressed by the simple expression (two-dimensional shape model) on the sheet body 150 of the aggregation destination part. Graphic objects 151 and 152 are represented. In addition, when the aggregation destination part object 153 of the attached figure is expressed in a wire frame display, as shown in FIG. 21A, it is expressed in a simple expression on the front and back surfaces of the wire frame 153 of the aggregation destination part. The attached graphic objects 151 and 152 are expressed. A simple representation (simple representation object) 154 of an attached figure is composed of a wire body 154a that schematically represents a molded shape and a point body 154b that represents a reference point, as shown in FIG. The shape of the figure is simply expressed. When the surface part that is the aggregation destination part of the attached figure is expressed by a three-dimensional solid body, the attached figure is expressed in a simple expression on the front and back surfaces by being offset from the intermediate sheet body. However, if the attached graphic is expressed by simple expression, the shape of the part cannot be expressed accurately. The actual shape of the part has a hole that penetrates the part when the attached graphic represents a hole, and the part has a molded shape such as a diaphragm when the shape is represented. . In order to express these shapes, as shown in FIG. 21C, the attached figure is a detailed expression (detailed expression object) that faithfully represents the actual shape with a three-dimensional solid body (three-dimensional shape model). 155 with a simple expression 154. In order to represent the three-dimensional solid body 160 in which the molded shape, the hole shape, etc. are edited, as shown in FIG. 22, the shapes 162 and 163 are subtracted from the three-dimensional solid body 161 before editing the aggregation destination part of the attached figure. And the addition of the shape 164 is necessary. However, when expressing the hole shape, it is not necessary to add the shapes. For these reasons, the attached graphic class has methods such as a method for obtaining a shape at the time of simple expression, a method for obtaining a shape to be subtracted from the part at the time of detailed expression, and a method for obtaining a shape to be added to the part at the time of detailed expression.

  The attached molded figure class 50 is a class derived from the attached figure class 49 as shown in FIG. It has a method for obtaining an arrangement matrix that represents an arrangement matrix. Molding shape data is defined in an external molding shape library (not shown). Even if the molding shape data in the molding shape library is changed or deleted, the sheet metal model will not be inconsistent. The attached molding figure class 50 has a function of storing and storing molding shape data. The attached molding figure class 50 acquires molding shape data such as an identification number in a molding shape library, a two-dimensional wire body for simple expression, a three-dimensional solid body to be added during detailed expression, and a three-dimensional solid body to be subtracted during detailed expression. Has a method. Thus, since the attached figure class 50 is derived from the attached figure class 49, it has a method for acquiring two types of shapes for simple expression and detailed expression. In each state, a method such as adding the shape of an attached figure in accordance with a simple expression or a detailed expression is provided in the surface part class 35 and the bending part class 36, and the hole shape and molding provided in the attached sketch figure class 48 are provided. A shape model is created in consideration of the shape acquired by the method for acquiring shape data such as the shape.

  As shown in FIG. 4, the attached wire graphic class 51 is a class derived from the attached graphic class 49, and includes points such as wire data expressing a hole shape, a marking line, and the like with a two-dimensional wire body, and a punch center. It has a method for acquiring point data representing a figure and an arrangement matrix representing a matrix in which these data are arranged at the aggregation destination site. The attached wire figure class 51 represents the shape with the same data during the simple expression and the detailed expression, and the data representing the shape to be added or subtracted in the 2D sheet body or the 3D solid body is the attached figure class 49. It is acquired by the method that has.

  The attached grid pattern figure class 52 and the attached arc pattern class class 53 are classes derived from the attached figure class 49, and the shapes represented by the attached molded figure class 50 and the attached wire figure class 51 are respectively gridded. It has a method that repeats according to the shape pattern or arc shape pattern.

  The part class 31 aggregates a machining quality class 38, a part attribute class 39, a machining information class 40, and a reference graphic class 37. The machining quality class 38 is a class that represents the machining quality of a sheet metal part, and has a method for obtaining machining quality data such as designation of a burr-free surface or a flaw-free surface. The part attribute class 39 is a class that represents an attribute of a sheet metal part, and obtains part attribute data such as a part name, a part number, a material, a parent part, and other related parts data, a delivery date, and a quantity of the sheet metal part. Has a method. The processing information class 40 is a class that represents a processing process when processing a sheet metal part, and a method for acquiring processing data such as a processing machine, a mold, a bending order, and the like used when the sheet metal part is processed. Have. The reference graphic class 37 is a class that represents a part having a sheet metal part as a constituent part, and has a method for acquiring graphic data such as part attributes and part shapes of the part and other constituent parts.

  Next, a sheet metal model creation system according to an embodiment of the present invention, or a method for creating an object-oriented sheet metal model by a sheet metal model creation system to which a sheet metal model creation method and a sheet metal model creation program according to an embodiment of the present invention are applied. Based on This method of creating an object-oriented sheet metal model is to create sheet metal model data of a sheet metal part from the design data of the sheet metal part including shape data consisting of various drawings and models indicating ideal finished shapes in the design stage. It is. As shown in FIG. 1, the design data is directly created and input by the terminal device 2 of the design department, or the terminal device is stored in advance from a storage medium such as a magnetic tape, an optical disk, or a flexible disk. 2 or read from the design database server 7, etc., is transmitted to the server device 4 via the LAN 3. In response to an instruction to create a sheet metal model from the terminal device 2, the server apparatus 4 executes the sheet metal model creation program P2 and creates sheet metal model data from the design data of the sheet metal part. The processing operation of the server device 4 when the sheet metal model creation program P2 is executed will be described based on the drawing according to the type of design shape data related to the shape of the design data. It should be noted that design data other than the shape such as the part name, part number, material, and machining quality requirement relating to the sheet metal part is stored and referred to in the sheet metal model database 6a as a machining quality object derived from the part object and a part attribute object. In addition, the program code of the sheet metal model creation program constituting a part of the sheet metal model program P2 is stored in, for example, the terminal device 2 of the design department instead of being stored in the server device 4, and the terminal device 2 The sheet metal model creation program may be executed to create a sheet metal model and stored in the sheet metal model database 6 a of the server device 4 via the LAN 3.

  When a three-dimensional solid model 170 of a sheet metal part is provided as design shape data, a sheet metal model 172 is created by three-dimensional shape conversion 171 as shown in FIG. In the three-dimensional shape conversion 171, first, the inner / outer loop search unit 173 performs outer loop analysis and inner loop analysis on the three-dimensional solid model 170 to recognize the hole shape. Next, the phase analysis unit 174 performs front surface search, back surface search, and plate thickness surface search, analyzes each surface of the three-dimensional solid model 170, and recognizes the intermediate surface in the plate thickness direction between the analyzed front and back surfaces. To do. Then, the geometric analysis unit 175 recognizes the bending portion and the surface portion of the intermediate surface, creates a bending portion object from the intermediate surface recognized as the bending portion, and creates a surface portion object from the intermediate surface recognized as the surface portion. A connector object expressing the connection state between the bending part object and the surface part object is created. In addition, an attached graphic object representing the hole recognized by performing the inner / outer loop search is created by matching the region object to which the hole is aggregated and the coordinate system. Further, the shape not recognized as a hole shape or a surface is recognized as a shaping shape by the shaping recognition unit 176, and the attached graphic object representing the shaping shape is made to coincide with the coordinate system of the part object to which the shaping unit is aggregated. Create. Finally, the respective objects are aggregated into part objects to create a sheet metal model 172, and the sheet metal model 172 is output from the sheet metal model output unit 177 and stored in the sheet metal model database 6a (see FIG. 1).

  When a development view 180 with a bent line of a sheet metal part is provided as design shape data, a sheet metal model 182 is created by a development view conversion 181 as shown in FIG. In the development drawing conversion 181, first, the bending information definition unit 183 extracts the bending line of the development drawing 180 and defines the bending information. Next, the element analysis unit 184 performs inner / outer circumference analysis to recognize the hole shape, and performs molding analysis to recognize the molding shape. Then, in the plane dividing unit 185, the bending line analysis is performed to analyze the bending, the bending portion and the surface portion are recognized, the surface is cut, and the bending portion object is recognized as the surface portion from the intermediate surface recognized as the bending portion. Each surface part object is created from the intermediate surface, and a connector object expressing the connection state between these bending part objects and the surface part object is created. Then, the internal graphic distribution is performed, and an attached graphic object expressing the recognized hole shape or molding shape is created by matching the position object of the hole shape or molding shape with the coordinate system. Further, the consistency confirmation unit 186 performs cycle analysis and multi-bent analysis to confirm the consistency, and then aggregates the objects into part objects to create a sheet metal model 182, and the sheet metal model output unit 187 generates a sheet metal model. 182 is output and stored in the sheet metal model database 6a (see FIG. 1).

  When a three-view drawing 190 including a front view, an upper view, a lower view, a left view, a right-hand view, and a rear view of a sheet metal part is provided as design shape data, a three-view drawing conversion 191 as shown in FIG. Thus, a sheet metal model 192 is created. First, in the side view conversion unit 191, the side view definition unit 193 detects the type of each side view from the three view diagram 190 based on, for example, the layout of the drawing, and the figure group and reference points constituting the side view are detected. Define. Next, in the shape extraction unit 194, the outer periphery and inner periphery of each side view are extracted to recognize the hole shape, and the forming position is defined to recognize the forming shape. Then, the shape projection unit 195 detects the relative depth of each side view and generates a shape projected onto the three-dimensional space, and the bending designation unit 196 recognizes the bending, and recognizes the bending portion and the surface portion. To do. Create a bending part object from the intermediate surface recognized as a bending part, create a surface part object from the intermediate surface recognized as a surface part, and create a connector object that expresses the connection state between these bending part objects and the surface part object To do. Then, an attached graphic object expressing the recognized hole shape or molding shape is created by matching the coordinate object with the part object to which the hole or molding unit is aggregated. Finally, the respective objects are aggregated into part objects to create a sheet metal model 192, and the sheet metal model 192 is output from the sheet metal model output unit 197 and stored in the sheet metal model database 6a (see FIG. 1). Note that a three-dimensional solid model may be created from the three-view drawing 190 using a general-purpose drawing conversion system, and the sheet metal model 192 may be created from the three-dimensional solid model as described above.

  Next, a detailed procedure for creating sheet metal model data of the sheet metal part when the surface part and the bending part are recognized from the design data of the sheet metal part by these methods will be described with reference to the drawings. Here, as shown in FIG. 26 (a), a case will be described in which three intermediate surfaces including a non-bent surface 200A, a bent surface 201A, and a non-bent surface 202A are expressed as parts connected in a row. Further, it is assumed that the deformation geometry of the bending surface 201A is a cylindrical deformation. First, as shown in FIG. 26B, a part object 203 is newly created, and a material and a plate thickness are set for the part object 203. Then, a connected part object 204 is created and added to the part object 203.

  Next, a surface part object 200 representing the surface 200A is created by the following procedure and added to the connected part object 204. First, a phase relationship with the intermediate surface sheet body of the surface 200 </ b> A is created and set in the surface part object 200. The surface part object 200 is also a part object. The surface part object 200 is added to the connected part object 204, and the surface 200A is designated as the reference part. Further, since the display position of the reference part becomes the display position of the connected part object 204, the arrangement matrix of the surface part object 200 is set.

  Next, the bending part object 201 expressing the bending surface 201A is created by the following procedure. First, a phase relationship with the intermediate sheet body of the bending surface 201A is created and set in the bending part object 201. The bending part object 201 is also a part object. A cylindrical deformation object 205 is created by setting a bending angle and a bending radius. The cylindrical deformation object 205 is also a deformation geometric object. The cylindrical deformation object 205 is set as the bending part object 201. Further, an end line of the intermediate surface of the bending surface 201A is set, and a stretch value is set for the cylindrical deformation object 205.

  Next, the bending part object 201 is added to the connection part object 204 by the following procedure. First, a connector object 206 is created to represent the connection between the surface 200A and the bending surface 201A. Then, an array of connection edges connected from the intermediate surface sheet body of the surface part object 200 to the bending part object 201 is created, and an array of connection edges connected from the intermediate surface sheet body of the bending part object 201 to the surface part object 200 is created. To do. The direction in which the surface part object 200 and the bending part object 201 are desired to be connected is checked, and the arrangement of the surface part object 200, the bending part object 201, the connection edge, and the direction of the surface are set in the connector object 206. The end line of the bending part object 201 is associated with the connector object 206. Then, the bending part object 201 and the connector object 206 are added to the connection part object 204.

  Next, a surface part object 202 representing the surface 202 A is created by the following procedure and added to the connected part object 204. First, a phase relationship with the intermediate sheet body of the surface 202A is created and set in the surface part object 202. The surface part object 202 is also a part object. A connector object 207 is created to represent the connection between the bending surface 201A and the surface 202A. An array of connection edges that connect from the intermediate surface sheet body of the bending region object 201 to the surface region object 202 is created, and an array of connection edges that connect from the intermediate surface sheet body of the surface region object 202 to the bending region object 201 is created. The direction in which the bending part object 201 and the surface part object 202 are desired to be connected is examined, and the bending part object 201, the surface part object 202, the arrangement of the connection edges, and the direction of the surface are set in the connector object 207. The end line of the bending part object 202 is associated with the connector object 207. Then, the connector object 207 is added to the connected part object 204. Thereby, the part object 203 expressing the sheet metal model of the sheet metal part is created.

  Next, an object-oriented sheet metal model created by a sheet metal model creation system according to an embodiment of the present invention, or a sheet metal model creation system to which a sheet metal model creation method or a sheet metal model creation program according to an embodiment of the present invention is applied, and FIG. 4 is a diagram illustrating processing of an object-oriented sheet metal model created by a sheet metal model creation system according to an embodiment of the present invention, or a sheet metal model creation system to which a sheet metal model creation method and a sheet metal model creation program according to an embodiment of the present invention are applied. Based on As shown in Fig. 1, each of the parts design department, process design department, punching department, cutting department, bending department, other general departments for sheet metal parts including welding and tapping, inspection department, etc. The terminal device 2 is installed, and operators in each department can access the sheet metal model database 6a via the LAN 3 by inputting various instructions from the input means of the terminal device 2, and can select a desired sheet metal model. Data can be displayed on the display means of the terminal device 2 or output from the output means of the terminal device 2. Thereby, the sheet metal model data stored in the sheet metal model database 6a can be shared and used in each department as shown in FIG. The sheet metal model data can be read by a terminal device such as a computer not connected to the LAN 3 by storing the sheet metal model data in a storage medium such as a magnetic tape, an optical disk, or a flexible disk.

  In the parts design department, according to orders from customers and customers, sheet metal parts are individually developed, or parts are developed from parent parts that include sheet metal parts as components by welding, fastening, etc., and a single sheet metal part is designed. . The shape of the sheet metal part determined in the initial design stage is usually an ideal finished shape, for example, the shape of the bent part having a certain bending radius, and the shape of the sheet metal part actually obtained by processing the sheet metal. Is different.

  In recent years, concurrent engineering has become commonplace, and design information can be used in many processes related to product development such as CAE (Computer Aided Manufacturing), mold design, prototyping, and product documentation. Creating a three-dimensional model using Design) is the mainstream, and the ideal finished shape of sheet metal parts is often designed with a three-dimensional solid model. As described above, design shape data indicating an ideal completed shape or the like including a three-dimensional solid model at the design stage is input from the terminal device 2, and sheet metal model data is generated and stored in the sheet metal model database 6a. Also, in the design stage, design data other than design shape data such as the part name, part number, material, processing quality requirement, etc. relating to the sheet metal part is input from the terminal device 2 in relation to the sheet metal part and is derived to the part object of the part model. Sheet metal model data is generated as a processing quality object and a part attribute object to be stored and stored in the sheet metal model database 6a.

  By the way, in the design stage, part design including sheet metal parts generally involves a process of trial and error, and the ideal finished shape is not uniquely determined. The shape of a part of the sheet metal part may be changed due to the reason that bending is difficult due to factors caused by the NC machine or the like. In such a case, especially when changing the shape of a part of a complicated sheet metal part, even if the change affects other parts, the change part is a bent part or a surface part. Since only these parts, and if the changed part is a hole or a molded part, the sheet metal model can be changed simply by replacing these attached figures, etc., the 3D solid can be changed again. Compared with the case of generating a model, it is easy to change the shape model of the sheet metal part, and the time until it is displayed again on the display means of the terminal device 2 can be shortened. Furthermore, the method held by the part class described above allows the connected part object to be temporarily composed of a plurality of parts that are developed into a plurality of developed shapes. Therefore, it is possible to easily perform work for examining whether or not it is preferable to perform welding or the like from costs, manufacturing factors, and the like.

  In the three-dimensional solid model, for example, a point graphic indicating a punch center, a line graphic such as a marking line, and other characters and patterns may appear on the surface of the component. Such a figure is expressed as an attached figure, and has two types of shapes, a three-dimensional solid body that is a detailed expression and a wire body that is a simple expression, and can be appropriately displayed as necessary. It becomes possible.

  In the process design department, processing simulation is performed in accordance with a sheet metal model expressing an ideal completed shape, and processing information and processing procedures for processing a sheet metal part with an actual processing machine are determined. Usually, the shape of the sheet metal model that represents the ideal completed shape is usually different from the shape of the finished sheet metal part after sheet metal processing and the shape of the flat sheet metal part in the developed state.

  Before the bending process, it is necessary to process the unfolded sheet metal member before the bending process by punching or cutting. This unfolded shape needs to be determined so that the shape after bending satisfies the processing quality such as bending angle and bending dimension tolerance required at the design stage. The shape after machining by bending, its dimensions, and the angle error vary depending on various factors such as the combination of the die and punch mold, V width, plate thickness, material, bending machine performance, and characteristics. Therefore, especially when high-precision shape quality is required after bending, machining simulation is performed in order to determine optimum bending conditions by combining these factors.

  With reference to FIG. 1, the operator of the process design department accesses the material database 6b from the terminal device 2 of the department and accesses material data such as sheet thickness and tensile strength of the sheet metal material to the mold database 6c. Thus, it is possible to refer to mold data such as various dimensions of the mold, allowable load, and applicable construction methods. In the part design stage, the sheet metal material is specified, for example, as 1.5 mm thick SPHD standardized by JIS, but the actual sheet metal material thickness and tensile strength differ depending on the specific product, The material database 6b stores material data for each product of the sheet metal material. The operator of the process design department searches from the material data, the mold database 6c and the processing machine database 6d, and instructs at the part design stage from the mold data and processing machine data to be referred to, and stores the processing quality object. A combination that satisfies the quality is obtained by machining simulation.

  The operator of the process design department needs to determine the bending order when the sheet metal part has a plurality of bending portions. This is because the difference in bending order may cause interference between the sheet metal part and the mold, or may affect the shape and accuracy after processing. In such a case, even if a plurality of bending processes are required at the same bending site as in the hemming process, a shape model in an arbitrary intermediate state of the sheet metal model can be specified. Since the intermediate state has a three-dimensional solid model, an interference check and a shape check can be easily performed.

  Then, the operator obtains the processing information such as the mold, the processing machine, and the bending order when processing the sheet metal part obtained by the processing simulation as a processing information object derived from the part object related to the sheet metal part. 6a.

  When the molding process such as drawing is performed after bending, the operator does not normally need to recognize the molding shape such as drawing in the punching process or bending process. In other words, the sheet metal model can be expressed with a light data structure. However, in order to align, dimension, and place parts support on the processing machine, the punching process or bending process may require an accurate shape. If the forming shape is expressed by the detailed expression of the attached graphic object, the shape model of the sheet metal part can be expressed by a three-dimensional model.

  Even if there is no change in the sheet metal part in the completed state, the shape of the sheet metal part in the unfolded state may be changed due to a change in the processing factor of the bending process or the like. Even in such a case, the sheet metal model has a shape model of each state of the completed state, the unfolded state, and the intermediate state, so that the shape in each state can be accurately expressed. Furthermore, in addition to the shape model in each state, the sheet metal model may have a shape model in an actual machining state that represents an actual machining shape with a three-dimensional solid body. As a result, the actual machining shape can be accurately expressed, and the modeling accuracy is further increased.

  When NC machines are used in the punching process and bending process, the control code for controlling these NC machines and executing the machining procedure is from the sheet metal model to APT (Automatically Programmed Tool), EXATP (Extended APT), etc. The tool path is automatically processed and automatically created using the automatic programming language. The control code obtained in this way is input to the NC processing machine through a storage medium such as a magnetic tape or a flexible disk. In the case of a CNC (Computer Numerical Control) machine, the control code may be transmitted to a computer (corresponding to the terminal device 2 in FIG. 1) attached to the CNC machine. The control code for performing the punching process is normally generated based on the data of the developed shape of the sheet metal part shown in the developed view, and this data is obtained from the data of the intermediate sheet body in the developed state of the sheet metal model. be able to. On the other hand, the control code for bending is normally generated based on the data of the three-dimensional solid body of the sheet metal part, and this data depends on the three-dimensional solid body in the completed state or the intermediate state of the sheet metal model. Obtainable.

  The operator of the punching department, the cutting department or the bending department accesses the database server 6 from the terminal device 2 of the department with reference to FIG. 1, and develops the sheet metal part, ideal finished shape, material, and processing. Sheet metal model information such as information can be displayed on the display means of the terminal device 2 or output from the output means of the terminal device 2. At this time, a shape model such as an intermediate sheet body or a three-dimensional solid body of the sheet metal part can be displayed at the same time. For example, it is possible to confirm both the shape before processing and the shape after processing.

  As described above, the sheet metal model creation system according to the embodiment of the present invention, or the sheet metal model creation system to which the sheet metal model creation method and the sheet metal model creation program according to the embodiment of the present invention are applied, the bending part object is not bent. And a sheet metal because the connector object expresses the relationship between the connection edge of the surface part object and the connection edge of the bending part object. When a part of the part shape model is changed, the shape model can be changed by replacing the intermediate surface sheet body of the surface part object or the bending part object with the data related to the change. Therefore, the shape model can be easily changed as compared with the conventional sheet metal model that integrally expresses the entire shape of the sheet metal part.

  Further, the main data of the plane part object and the bending part object is the intermediate sheet body in the unfolded state, the intermediate sheet body in the completed state and the intermediate state, and the three-dimensional solid body in the expanded state, the completed state, and the intermediate state. Since it is created from the intermediate sheet body as necessary, it is possible to reduce the amount of data compared to the conventional sheet metal model that needs to have a three-dimensional solid model independently for each state, In addition, this makes it possible to reduce the amount of data processing required when displaying a three-dimensional solid model by changing viewpoints such as roll, pan, and zoom, or by rotating the shape model itself.

  Furthermore, since the shape model in the specified intermediate state can be acquired, for example, it is possible to acquire a shape model in the middle of bending processing such as split bending processing or bending processing with a different bending order. Interference confirmation can be easily performed.

  Furthermore, when a shape model in which the molded shape is expressed in detail by a three-dimensional solid body is necessary, such a shape model can be displayed. On the other hand, when such a shape model is not required, the data amount of the sheet metal model can be reduced as compared with the case where the forming shape is simply expressed and expressed in detail.

A block showing a hardware configuration environment for executing a sheet metal model creation system 1 according to an embodiment of the present invention, or a sheet metal model creation system 1 to which a sheet metal model creation method and a sheet metal model creation program according to an embodiment of the present invention are applied. FIG. It is a block diagram which shows an example of the hardware constitutions of the terminal device. 2 is a block diagram illustrating an example of a hardware configuration of an application server 5 and a database server 6. FIG. It is a class diagram of an object-oriented sheet metal model. It is a figure explaining the relationship between each object which a part object aggregates, and the shape model of sheet metal parts. It is a figure explaining the surface site | part and bending site | part of a sheet metal model, (a) shows an unfolded state, (b) shows a completed state. It is a figure explaining the shape of each state of a sheet metal model, (a) shows an unfolded state, (b) shows a completed state, and (c) shows an intermediate state. It is a figure explaining the intermediate state in the case of a hemming process, (a) to (d) shows a different intermediate state, respectively. It is a figure explaining an amateur bending process, (a) and (c) to (e) show different middle states, respectively, and (b) shows interference with a metallic mold. It is a figure explaining a bending back process, (a) and (c) to (f) shows a different middle state, respectively, (b) shows interference with a metal mold | die. It is a figure explaining the method which produces | generates a solid body etc. from an intermediate sheet body. (A) is a figure explaining a connection edge, (b) is a figure explaining forward connection and reverse connection, respectively. It is a figure explaining a fixed line and an end line, (a) shows a completed state, (b) shows a single subordinate state. It is a figure explaining the halfway state which considered spring back, (a) to (c) shows a different halfway state, respectively. It is a figure explaining the division | segmentation bending in cylindrical bending, (a) shows an unfolding state, (b) shows a completion state. It is a figure explaining the middle state of the division | segmentation bending in cylindrical bending, (a) to (d) shows a different middle state, respectively. It is a figure explaining specifying the intermediate state of the division | segmentation bending in cylindrical bending using each information. It is a figure explaining a step bending deformation class, (a) shows two cylindrical deformations, (b) shows the step bending deformation which combined two cylindrical deformations and one fixed deformation. It is a figure explaining the relationship between each object which a part object aggregates, and a sheet metal model. It is a figure explaining the relationship in the simple expression of a part object and an attached figure object. (A) is a three-dimensional model expressed in wireframe display, (b) is a simplified representation of the molded part held by the attached graphic object, (c) is a detailed representation of the molded part shown in (b), respectively. FIG. It is a figure explaining the relationship in the detailed expression (solid shape) of a site | part object and an attached figure object. It is a figure explaining the method of producing a sheet metal model from a three-dimensional solid model. It is a figure explaining the method of producing a sheet metal model from a development view. It is a figure explaining the method of creating a sheet metal model from a three-sided view. It is a figure explaining a sheet metal model and a relationship with an object, (a) shows a sheet metal model, (b) shows an object figure. It is a figure explaining using a sheet metal model in each department.

Explanation of symbols

1 Sheet metal model creation system 2 Terminal device (computer)
3 LAN
4 Server device (computer)
5 Application server (computer)
6 Database server (computer)
6a Sheet metal model database 6b Material database 6c Mold database 6d Processing machine database 6e Bending correction value database 30 Sheet metal model 31 Part class 32 Connection part class 33 Connector class 34 Part class 35 Surface part class 36 Bending part class 41 Deformation geometry class 48 Attached sketch graphics class 49 Attached graphics classes P1, P2 Sheet metal model creation program

Claims (21)

A sheet metal model creation system that creates a shape model of a sheet metal part manufactured in a processing facility including bending using a computer,
Recognize the non-bending part and bending part of the sheet metal part from the design shape data of the sheet metal part, and express the shape of the intermediate surface in the thickness direction after bending, which is the completed state of the non-bending part and the bending part, respectively. An intermediate surface model creating means for creating an intermediate surface model of the two-dimensional surface data structure
Connector data creating means for creating connector data expressing a connection part and a phase between the non-bending part and the bending part;
From the design shape data of the sheet metal part, sheet thickness data creating means for creating sheet thickness data expressing the sheet thickness of the sheet metal part,
Create a completed state model for creating a completed state model of a three-dimensional solid model structure that adds the plate thickness to the intermediate surface model of the unbent and bent portions to express the shape of the completed state of the unbent and bent portions Means,
A developed intermediate surface model creating means for creating a developed intermediate surface model of a two-dimensional surface data structure expressing the shape of the intermediate surface in the thickness direction before bending, which is the expanded state of the bending part;
An unfolded state model creating means for creating a unfolded state model of a three-dimensional solid model structure that adds the plate thickness to the unfolded state intermediate surface model of the bent portion and expresses the unfolded shape of the bent portion;
Selection accepting means for accepting selection of whether the bending part is expressed in a completed state or an unfolded state;
Based on the state selected by the selection accepting means, either the intermediate surface model of the bent part or the developed intermediate surface model is connected to the intermediate surface model of the non-bent part based on the connector data. A selected state intermediate plane model creating means for creating the selected intermediate plane model;
Based on the state selected by the selection accepting means, either the completed state model or the expanded state model of the bent part is connected to the completed state model of the non-bent part based on the connector data, and selected. A selection state model creation means for creating a model of the state that has been selected;
A sheet metal model creation system characterized by comprising: A halfway state intermediate surface model creating means for creating a halfway state intermediate surface model of a two-dimensional surface data structure expressing the shape of the intermediate surface in the thickness direction in the middle of the bending process, which is a halfway state of the bending portion;
A halfway state model creating means for creating a halfway state model of a three-dimensional solid model structure that adds the plate thickness to the halfway state intermediate surface model of the bending portion and expresses the shape of the halfway state of the bending portion; ,
The selection accepting means accepts a selection of expressing the bent part in a completed state, an unfolded state or an intermediate state;
Based on the state selected by the selection accepting means, the selected state intermediate surface model creating means is connected to the bent data indicating either the intermediate surface model, the unfolded state or the intermediate state intermediate surface model of the bent portion. Based on the state, connect with the intermediate surface model of the non-bending part, create an intermediate surface model of the selected state,
Based on the connection state indicated by the connection data, the selected state model creating means is based on the state selected by the selection accepting means, and indicates whether the bending part is a completed state model, an unfolded state model, or an intermediate state model. The sheet metal model creation system according to claim 1, wherein the model is connected to the completed state model of the non-bending portion to create a model in a selected state. Forming model creating means for recognizing a forming part that is formed by processing other than bending from the design shape data of the sheet metal part and creating a forming model of a three-dimensional solid model structure that expresses deformation to the shape of the forming part When,
A simple molding model creating means for creating a simple molding model of a two-dimensional data structure that abstractly expresses deformation of the molding part into a shape;
Molding standard data creating means for creating molding standard data indicating an additional standard to the intermediate surface model of the non-bending part or the bending part of the simple molding model;
With an additional standard indicated by the molding standard data, molding model editing means for performing editing by the molding model on the completed state model, the expanded state model, and the intermediate state model,
Simple molding model editing means for editing the intermediate surface model, the unfolded intermediate surface model, and the intermediate state intermediate surface model with the simple forming model, with the additional reference indicated by the forming position data;
The sheet metal model creation system according to claim 2, comprising: Material data storage means for storing various data of the material of the sheet metal part;
Mold data storage means for storing various data of molds used when bending,
A three-dimensional solid data structure that represents the shape of the virtual finished state of the bending portion that is presumed when bending is performed based on various data stored in the material data storage means and the mold data storage means Virtual completion state model creating means for creating a virtual completion state model of
The selection accepting means accepts a selection of expressing the bent part in a completed state, an unfolded state, an intermediate state or a virtual completed state;
4. The sheet metal model according to claim 2, wherein when the selection receiving unit receives a selection expressed in a virtual completion state, the virtual completion state model generation unit generates the virtual completion state model. 5. Creation system. With processing machine data storage means for storing various data related to the characteristics of the processing machine that performs bending,
5. The sheet metal model creation system according to claim 4, wherein the virtual completion state model creation unit creates the virtual completion state model in consideration of various data stored in the processing machine data storage unit. Bending correction value data storage means for storing various data related to bending correction values when bending is provided,
The sheet metal model according to claim 4 or 5, wherein the virtual completed state model creating unit creates the virtual completed state model in consideration of various data stored in the bending correction value data storing unit. Creation system. The material data storage means stores actual sheet thickness data indicating the actual sheet thickness of the material of the sheet metal part,
The actual plate stored in the material data storage means in the intermediate plane model, the expanded intermediate plane model, and the intermediate intermediate plane model, the completed state model generating means, the expanded state model generating means, and the intermediate state model generating means. The sheet metal model creation system according to any one of claims 4 to 6, wherein the virtual finished state model, the unfolded state model, and the intermediate state model are created by adding the sheet thickness indicated by the thickness data. . A sheet metal model creation method for creating a shape model of a sheet metal part manufactured in a processing facility including bending using a computer,
Recognize the non-bending part and bending part of the sheet metal part from the design shape data of the sheet metal part, and express the shape of the intermediate surface in the thickness direction after bending, which is the completed state of the non-bending part and the bending part, respectively. An intermediate surface model creating step for creating an intermediate surface model of the two-dimensional surface data structure to be performed;
A connector data creating step for creating connector data representing a connection part and a phase between the non-bending part and the bending part;
From the design shape data of the sheet metal part, a sheet thickness data creation step for creating sheet thickness data representing the sheet thickness of the sheet metal part;
Create a completed state model for creating a completed state model of a three-dimensional solid model structure that adds the plate thickness to the intermediate surface model of the unbent and bent portions to express the shape of the completed state of the unbent and bent portions Steps,
A developed intermediate surface model creating step for creating a developed intermediate surface model of a two-dimensional surface data structure representing a shape of the intermediate surface in the thickness direction before bending, which is a developed state of the bending portion;
An unfolded state model creating step of creating a unfolded state model of a three-dimensional solid model structure that adds the plate thickness to the unfolded state intermediate surface model of the bent portion and expresses the unfolded shape of the bent portion;
A selection receiving step for receiving an input for selecting whether to express the bending portion in a completed state or an unfolded state;
Based on the state selected by the selection accepting means, either the intermediate surface model of the bent part or the developed intermediate surface model is connected to the intermediate surface model of the non-bent part based on the connector data. A selected intermediate plane model creating step for creating a selected intermediate plane model;
Based on the state selected by the selection accepting means, either the completed state model or the expanded state model of the bent part is connected to the completed state model of the non-bent part based on the connector data, and selected. A selection state model creation step for creating a model of the selected state;
A sheet metal model creation method comprising: An intermediate state intermediate surface model creating step for creating an intermediate state intermediate surface model of a two-dimensional surface data structure expressing the shape of the intermediate surface in the thickness direction in the middle of the bending process, which is an intermediate state of the bending part;
A halfway state model creating step of creating a halfway state model of a three-dimensional solid model structure that adds the plate thickness to the halfway state intermediate surface model of the bent portion and expresses the shape of the halfway state of the bent portion; ,
The selection accepting means accepts a selection of expressing the bent part in a completed state, an unfolded state or an intermediate state;
In the selection state intermediate plane model creation step, based on the state selected by the selection accepting unit, the connection data indicates any one of the intermediate plane model, the unfolded state, or the intermediate state intermediate plane model of the bent portion Based on the state, connect with the intermediate surface model of the non-bending part, create an intermediate surface model of the selected state,
In the selection state model creation step, based on the state selected by the selection receiving means, either the completed state model, the unfolded state model or the intermediate state model of the bending portion is based on the connection state indicated by the connection data. The sheet metal model creation method according to claim 8, wherein the model is connected to the completed state model of the non-bending portion to create a model in a selected state. A molding model creation step of recognizing a molding part to be molded other than bending from the design shape data of the sheet metal part and creating a molding model of a three-dimensional solid model structure that expresses a deformation to the shape of the molding part When,
A simple molding model creation step of creating a simple molding model of a two-dimensional data structure that abstractly expresses deformation of the molding part into a shape;
A molding standard data creation step for creating molding standard data indicating an additional standard to the intermediate surface model of the non-bending part or the bending part of the simple molding model,
A molding model editing step for performing editing by the molding model on the completed state model, the unfolded state model, and the intermediate state model according to the additional criterion indicated by the molding criterion data;
In the additional standard indicated by the molding position data, a simple molding model editing step for editing the intermediate surface model, the unfolded intermediate surface model and the intermediate state intermediate surface model with the simple molding model;
The sheet metal model creation method according to claim 9, comprising: Based on the various data stored in the material data storage means for storing various data of the material of the sheet metal part and the mold data storage means for storing the various data of the mold used when performing the bending process, the bending process is performed. A virtual completed state model creating step for creating a virtual completed state model of a three-dimensional solid data structure that represents the shape of the virtual completed state of the bending part that is presumed in the case of being virtually performed,
In the selection accepting step, accepting a selection of expressing the bent part in a completed state, an unfolded state, an intermediate state, or a virtual completed state;
11. The sheet metal model according to claim 9, wherein the virtual completed state model is created in the virtual completed state model creating step when a selection expressed in a virtual completed state is accepted in the selection input step. How to make.   In the virtual completion state model creation step, the virtual completion state model is created in consideration of various data stored in processing machine data storage means for storing various data relating to characteristics of the processing machine that performs bending. The sheet metal model creation method according to claim 11.   In the virtual completion state model creation step, the virtual completion state model is created in consideration of various data stored in a bending correction value data storage unit that stores various data related to a bending correction value at the time of bending. The sheet metal model creation method according to claim 11 or 12. The material data storage means stores actual sheet thickness data indicating the actual sheet thickness of the material of the sheet metal part,
In the completed state model creating step, the unfolded state model creating step, and the intermediate state model creating step, the actual plate stored in the material data storage means in the intermediate surface model, the unfolded state intermediate surface model, and the intermediate state intermediate surface model The sheet metal model creation method according to any one of claims 11 to 13, wherein the virtual finished state model, the unfolded state model, and the intermediate state model are created by adding the sheet thickness indicated by the thickness data. . A sheet metal model creation program that causes a computer to function as a sheet metal model creation means for creating a shape model of a sheet metal part manufactured in a processing facility including bending,
Recognize the non-bending part and bending part of the sheet metal part from the design shape data of the sheet metal part, and express the shape of the intermediate surface in the thickness direction after bending, which is the completed state of the non-bending part and the bending part, respectively. An intermediate surface model creating means for creating an intermediate surface model of the two-dimensional surface data structure
Connector data creating means for creating connector data expressing a connection part and a phase between the non-bending part and the bending part;
From the design shape data of the sheet metal part, sheet thickness data creating means for creating sheet thickness data expressing the sheet thickness of the sheet metal part,
Create a completed state model for creating a completed state model of a three-dimensional solid model structure that adds the plate thickness to the intermediate surface model of the unbent and bent portions to express the shape of the completed state of the unbent and bent portions Means,
A developed intermediate surface model creating means for creating a developed intermediate surface model of a two-dimensional surface data structure expressing the shape of the intermediate surface in the thickness direction before bending, which is the expanded state of the bending part;
An unfolded state model creating means for creating a unfolded state model of a three-dimensional solid model structure that adds the plate thickness to the unfolded state intermediate surface model of the bent portion and expresses the unfolded shape of the bent portion;
Selection accepting means for accepting selection of whether the bending part is expressed in a completed state or an unfolded state;
Based on the state selected by the selection accepting means, either the intermediate surface model of the bent part or the developed intermediate surface model is connected to the intermediate surface model of the non-bent part based on the connector data. A selected state intermediate plane model creating means for creating the selected intermediate plane model;
Based on the state selected by the selection accepting means, either the completed state model or the expanded state model of the bent part is connected to the completed state model of the non-bent part based on the connector data, and selected. A selection state model creation means for creating a model of the state that has been selected;
A sheet metal model creation program characterized by comprising: A halfway state intermediate surface model creating means for creating a halfway state intermediate surface model of a two-dimensional surface data structure expressing the shape of the intermediate surface in the thickness direction in the middle of the bending process, which is a halfway state of the bending portion;
A halfway state model creating means for creating a halfway state model of a three-dimensional solid model structure that adds the plate thickness to the halfway state intermediate surface model of the bending portion and expresses the shape of the halfway state of the bending portion; ,
The selection accepting means accepts a selection of expressing the bent part in a completed state, an unfolded state or an intermediate state;
Based on the state selected by the selection accepting means, the selected state intermediate surface model creating means is connected to the bent data indicating either the intermediate surface model, the unfolded state or the intermediate state intermediate surface model of the bent portion. Based on the state, connect with the intermediate surface model of the non-bending part, create an intermediate surface model of the selected state,
Based on the connection state indicated by the connection data, the selected state model creating means is based on the state selected by the selection accepting means, and indicates whether the bending part is a completed state model, an unfolded state model, or an intermediate state model. The sheet metal model creating program according to claim 15, wherein the model is connected to the completed state model of the non-bending portion to create a model in a selected state. Forming model creating means for recognizing a forming part that is formed by processing other than bending from the design shape data of the sheet metal part and creating a forming model of a three-dimensional solid model structure that expresses deformation to the shape of the forming part When,
A simple molding model creating means for creating a simple molding model of a two-dimensional data structure that abstractly expresses deformation of the molding part into a shape;
Molding standard data creating means for creating molding standard data indicating an additional standard to the intermediate surface model of the non-bending part or the bending part of the simple molding model;
With an additional standard indicated by the molding standard data, molding model editing means for performing editing by the molding model on the completed state model, the expanded state model, and the intermediate state model,
Simple molding model editing means for editing the intermediate surface model, the unfolded intermediate surface model, and the intermediate state intermediate surface model with the simple forming model, with the additional reference indicated by the forming position data;
The sheet metal model creation program according to claim 16, comprising: Based on the various data stored in the material data storage means for storing various data of the material of the sheet metal part and the mold data storage means for storing the various data of the mold used when performing the bending process, the bending process is performed. Virtual completed state model creating means for creating a virtual completed state model of a three-dimensional solid data structure that expresses the shape of the virtual completed state of the bending portion that is presumed in the case of being virtual,
The selection accepting means accepts a selection of expressing the bent part in a completed state, an unfolded state, an intermediate state or a virtual completed state;
The sheet metal model according to claim 16 or 17, wherein, when the selection receiving unit receives a selection expressed in a virtual completion state, the virtual completion state model generation unit generates the virtual completion state model. Creation program.   The virtual completion state model creation means creates the virtual completion state model in consideration of various data stored in the processing machine data storage means for storing various data relating to characteristics of the processing machine that performs bending. The sheet metal model creation program according to claim 18.   The virtual completion state model creation means creates the virtual completion state model in consideration of various data stored in the bending correction value data storage means for storing various data related to the bending correction value at the time of bending. The sheet metal model creation program according to claim 18 or 19, characterized by. The material data storage means stores actual sheet thickness data indicating the actual sheet thickness of the material of the sheet metal part,
The actual plate stored in the material data storage means in the intermediate plane model, the expanded intermediate plane model, and the intermediate intermediate plane model, the completed state model generating means, the expanded state model generating means, and the intermediate state model generating means. 21. The sheet metal model creation program according to claim 18, wherein the virtual completion state model, the unfolded state model, and the intermediate state model are respectively created by adding a sheet thickness indicated by thickness data. .

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