JP3943566B2 - Computer-readable recording medium on which automatic programming device and sheet metal figure creation program are recorded - Google Patents

Description

  The present invention relates to an automatic programming apparatus that automatically displays a development view and a three-dimensional view of a sheet metal in conjunction with each other on the same screen while automatically checking an interference of the three-dimensional view and performing a reverse simulation.

  In recent years, line control systems for machine tools (bending, laser, punching, etc.) have advanced. In such a line control system, as shown in FIG. 21, an automatic programming device 1 (CAE) having a CAD / CAM function and a parent device 2 as a server are arranged on the office side, and these higher-level devices and lower-level devices are arranged. An on-site machine tool (NCT / laser, vendor), which is a device, is connected via a terminal 3, a terminal 4, and an NC device 5 via a LAN.

  Using the CAD function of the automatic programming apparatus 1 described above, the operator generates a development view for obtaining a machining program for NCT / laser while imagining a three-dimensional shape based on a three-view drawing, and then uses the CAM function to create a CAD. Appropriate tools are assigned to the generated development views, laser trajectories are obtained, and these machining programs are transmitted to the main unit 2. Elongation values are used to generate the above-described development chart. This elongation value is an elongation value selected according to the characteristics of the user's vendor and the specific situation of the user with reference to an elongation value table or the like.

  However, in the conventional automatic programming device, an operator must generate a development view while imagining a three-dimensional figure. Therefore, if the operator is not an experienced operator as the solid becomes complicated, an accurate development view can be easily obtained. It cannot be generated.

  Further, the conventional development view is a development view for obtaining a machining program for NCT / laser, and cannot be transferred to the NC device on the vendor side as it is.

  For example, the operator must generate an accurate development view that confirms the interference of the flange and the interference of the mold in order to ensure correct welding, and it is desirable that the elongation value is also an on-site side elongation value.

  In other words, the conventional automatic programming device does not check the interference of the flange and the mold on the CAD side, and the expansion value also generates a development figure while imagining the three-dimensional shape using the elongation value based on the elongation value table. Therefore, there was a problem that an accurate development view according to the situation on the site side could not be obtained.

  Therefore, it is desirable to easily obtain an accurate development view in consideration of the extension value on the site side and the interference between the flange and the mold on the CAD side of the automatic programming device.

  In the present invention, each surface constituting a solid inputted based on a two-dimensional three-view diagram is displayed on a screen, and when a reference surface and a butt surface are designated on the screen, both surfaces are matched. A temporary development view is obtained, and a three-dimensional figure obtained by bending the temporary development view based on bending conditions is displayed in a different area from the temporary development view, and a closed loop and a bending line of the outer frame of the temporary development view are extracted. It is an automatic programming device that sends the developed view to the subsequent CAM.

  This automatic programming device performs an interference calculation between the three-dimensional surfaces on the three-dimensional figure, and informs the surface of the interference portion and the interference area of the surface as an interference calculation result, and the final figure of the three-dimensional figure In order from the bending line, specify the mold and perform the interference calculation while performing the reverse simulation, and inform the surface in contact with the mold as the interference calculation result, and the interference calculation result of the graphic editing section or the reverse simulation section And a provisional development correction unit for correcting the provisional development based on the result of the interference calculation, and means for regenerating a three-dimensional figure bent under the bending conditions each time the provisional development is corrected. This is the gist.

  As described above, according to the present invention, a three-dimensional figure based on a development view is displayed on the screen, and an interference portion between the three-dimensional surfaces of the three-dimensional figure is displayed in a color different from that of the other three-dimensional surfaces.

  In addition, the development view is corrected based on the movement direction and amount of movement of the three-dimensional surface moved on the three-dimensional view, and the three-dimensional view is displayed again based on the temporary development view. In order from the bend line, interference calculation is performed while specifying a mold and performing reverse simulation.

  Next, after correcting the result of this interference calculation in the provisional development view, an outer frame of the provisional development view is obtained, and a development view in which a bending line is added to the outer frame is obtained as a final development view.

  For this reason, before passing to the CAM side, the provisional development figure and the three-dimensional figure are displayed on the screen in conjunction with each other, and the interference between the flange and the mold can be easily judged from the color of the three-dimensional figure, and the provisional development is also performed. The effect that the correction of the figure can be easily performed on the screen is obtained.

<Embodiment 1>
FIG. 1 is a schematic configuration diagram of an automatic programming apparatus of the sheet metal integration support system according to the first embodiment. This automatic programming device 10 includes a 2.5-dimensional CAD 11, CAM 12, and data transmission / reception unit 13, and displays each screen input based on a three-surface diagram Ai (two-dimensional) (also referred to as a figure shape input unit). 14 is communicated with a master unit (not shown) to transfer the bending attribute information (elongation value data) on the site side stored in the master unit, and a surface composite drawing Bi based on this elongation value (also referred to as a temporary development view) 3D) Ef (also referred to as 3D map data).

  Then, the stereoscopic figure Ei of this stereoscopic figure Ef can be displayed in conjunction with the screen 14, and the interference state or overlapping screen of the matching part on the stereoscopic figure Ei and the stereoscopic figure Ef are used. After performing reverse simulation or the like, the surface composite drawing Bi is corrected, and an accurate development view Qi in which the surface composite drawing Bi is drawn with one stroke is obtained.

  Further, the CAM 12 generates a machining program such as a machining locus and a die designation based on the developed view Qi obtained by the CAD 11 and sends it to the corresponding machine tool.

  The automatic programming device 10 according to the present embodiment also includes a data transmission / reception unit 13 that communicates with the parent device side to transfer elongation value information and the like.

(Configuration of CAD)
As illustrated in FIG. 1, the CAD 11 includes a figure shape input unit 14, a surface synthesis unit 15, a three-dimensional map generation unit 16, a three-dimensional drawing unit 17, a three-dimensional map editing unit 18, a reverse simulation unit 19, A development map correction unit 20 and a development map generation unit 21 are provided.

  The figure shape input unit 14 defines in the memory 22 each surface constituting a solid based on the three-view drawing Ai input by the operator.

  When two closed loop edges are designated by a mouse or a keyboard (not shown) among the closed loops of the screen defined in the memory 22, the surface synthesis unit 15 uses the closed loop of the first designated edge as a reference plane, A closed loop having a specified side is defined as a butt surface.

  Then, a surface composite diagram Bi in which the butt surface is moved on the memory 22 so that the butt surface overlaps the designated side of the reference surface (overlapping region) is generated and displayed on the screen 14. In this surface synthesis diagram Bi, surface synthesis is performed in an overlap region of elongation values.

  As the above-described surface composite image Bi of the overlap region of the elongation value is obtained, the overall size is shortened and the overlap region is corrected to be widened, and a bend line is added to the overlap region (also referred to as a bending region). . Further, the bending line information includes a line number, a line type, an elongation value, and the like.

  The three-dimensional map generation unit 16 generates a three-dimensional model when the surface composite view Bi of the memory 22 is bent based on the input bending angle θ and the bending direction (bending line is a reference), and the thickness is added to the three-dimensional model. Three-dimensional map data (also simply referred to as a three-dimensional map Ef) of the surface model to which the direction is added is stored in the three-dimensional map file 23.

  The three-dimensional image forming unit 17 takes in the three-dimensional image Ef generated by the three-dimensional image generation unit 16 and displays the three-dimensional image Ei projected on the screen space on the screen 14. It also has functions such as rotation, coloring, and enlargement.

  The three-dimensional map editing unit 18 performs a three-dimensional map interference calculation on the three-dimensional map Ef stored in the three-dimensional map file 23, or performs an interference calculation such as matching and superimposing, and these results are converted into a three-dimensional image forming unit 17. Use to display. The three-dimensional map editing unit 18 will be described in detail later with reference to the drawings.

  The inverse simulation unit 19 checks the interference between the mold and the flange while opening the three-dimensional view Ef in the reverse order.

  The temporary development map correcting unit 20 reads the correction value based on the interference check result of the three-dimensional map editing unit 18 and the inverse simulation unit 19, and corrects the surface composite drawing Bi based on the correction value.

  The development drawing generation unit 21 extracts an outer frame loop (which can be written with a single stroke) of the surface composite drawing Bi, and develops the development drawing Qi in which a bending line is added to the outer frame loop in the development drawing file 24 in association with the product number. sign up.

  Further, as shown in FIG. 2, the CAD 11 includes a surface recognition unit 30, an elongation value reading unit 31, a finite element method unit 32, and the like.

  The surface recognition unit 30 defines each surface constituting the solid based on the three-surface drawing in the memory 33, and recognizes the surface by tracing this closed loop.

  The elongation value reading unit 31 displays a bending elongation dialog for inputting bending conditions Ji such as plate thickness, material, bending angle, bending type, and the like, and bending attribute information Fi matching the bending conditions Ji set in this dialog is a file. It is determined whether or not it exists at 34, and when it exists, the elongation value is set in the surface synthesis unit 15.

  When the elongation value matching the bending condition Ji does not exist in the file 34, the finite element method unit 32 is activated and the bending condition Ji is sent to the finite element method unit 32.

  As shown in FIG. 3, the bending attribute information Fi transferred from the CAD 11 is added with a machine number, an elongation value information condition part including a bending elongation ID, a material name,..., An elongation value, and a springback amount. It is comprised from the elongation value data part which consists of etc.

  The finite element method unit 32 reads the material, the bending angle, the bending direction, and the like from the bending condition Ji, obtains the target stroke amount of the punch for achieving the bending angle, and performs the elastoplastic finite element method according to the target stroke amount. Using this method, the workpiece is displaced, and the elongation value when the displacement angle coincides with the bending angle is obtained.

  Then, the elongation value is set in the surface synthesis unit 15 instead of the elongation value reading unit 31, and the obtained elongation value and the bending condition Ji when the elongation value is obtained are stored in the file 34.

(Configuration of CAM)
The CAM 12 includes a machining trajectory generation unit 35, a sheet data creation unit 36, an NC data creation unit 37, a simulation unit 38, and the like, and obtains a machining trajectory on the workpiece based on a development view generated on the CAD side. Thus, accurate NC data for NCT and laser is obtained.

  The operation of the automatic programming apparatus 10 according to the first embodiment configured as described above will be described below.

  The automatic programming device 10 according to the present embodiment includes a keyboard, a mouse (not shown), a multi-window display / management unit that manages each program and performs multi-window display. The stereoscopic view Ei is displayed simultaneously.

  First, the surface recognition unit 30 performs surface recognition processing. This surface recognition processing is performed in accordance with the designation of the sides (for example, ga, gb) of each surface (closed surface loop Gi; Gai, Gbi,...) (See FIG. 4) constituting the solid based on the three-surface diagram on the screen 14. Trace the side to recognize the face. Next, the surface synthesis unit 15 performs a surface matching process. In this matching process, when the sides of two closed surface G loops Gi (Gai, Gbi) are designated by a mouse or a keyboard (not shown) in the closed surface loop Gi of the screen 14, the surfaces are brought into contact with each other. A composite diagram Bi is obtained on the screen 14 as shown in FIG.

  On the other hand, at the same time as the surface matching process, the three-dimensional view generation unit 16 is activated to perform a three-dimensional view display process for displaying a three-dimensional view Ei based on the face composite view Bi on the screen 14. That is, as shown in FIG. 6, the surface composite view Bi and the three-dimensional view Ei are displayed simultaneously.

  The three-dimensional figure Ei is generated by defining the three-dimensional coordinates of X, Y, and Z, defining the coordinates of the two-dimensional surface composite figure Bi to the three-dimensional coordinates, and then affine-transforming the surface based on the bending conditions. Generate a model. That is, 2.5-dimensional CAD is used rather than 3-dimensional CAD.

  Then, the three-dimensional figure that has been converted into the surface model is passed to the three-dimensional figure forming unit 17 to display the three-dimensional figure Ei in which the hidden surface is deleted.

  The three-dimensional image forming unit 17 inputs the three-dimensional map data and performs color painting on the three-dimensional map data.

  Accordingly, the screen 14 is displayed in conjunction with a provisional development view (surface composite view) Bi and a three-dimensional view with solid surfaces (a solid model view).

  This three-dimensional figure can be enlarged and rotated, and the mouse is instructed to enlarge and rotate. Processing such as enlargement and rotation uses three-dimensional affine transformation.

  On the other hand, the three-dimensional map editing unit 18 performs a three-dimensional interference calculation on the surface model, and when an interference location is detected, sends an instruction to display the interference location in green, for example, to the three-dimensionalization unit 17. Then, an interference check result screen as shown in FIG.

  In the interference check screen of FIG. 7, when the solid surface A and the solid surface B are raised from the direction of the arrows, the end portions of both surfaces overlap each other.

  Also, the three-dimensional map editing unit 18 displays the matching dialog shown in FIG. 8 and uses the three-dimensionalization unit 17 to distinguish the first flange and the second flange on the interference check screen according to the setting conditions of the matching dialog. Display.

  For example, in FIG. 8, the first flange is yellow and the second flange is red. Further, the three-dimensional drawing editing unit 18 displays the one to be drawn (yellow) by extending the drawing in the drawing mode display. Then, when the both-drawing mode of the matching dialog is selected, the interference portions on both sides are deleted as shown in FIG.

  Further, in order to delete the three-dimensional interference part, the area of the interference plane of the three-dimensional view is sent to the temporary development drawing correcting unit 20.

  When the area of the interference plane is input, the provisional development correction unit 20 deletes the area hi indicated by the area from the surface composite drawing Bi.

  For example, when the surface composite diagram Bi shown in FIG. 10A is generated, for example, when the drawing mode is set to the double drawing mode, the surface composite that is set as the interference region in the three-dimensional view as shown in FIG. 10B. By deleting the area hi in FIG. Bi, a corrected provisional development CP shown in FIG. 10C is obtained. Therefore, in the solid view obtained by re-three-dimensionalizing (surface model) the surface composite diagram of FIG. 10B, the surfaces do not overlap at the abutting portion as shown in FIG.

  The three-dimensional map editing unit 18 performs overlay editing. In this overlay editing, for example, the three-dimensional map editing unit 18 performs surface interference calculation on the first flange ma and the second flange mb of the three-dimensional map Ef of the file 23 (see FIG. 11), and the result is displayed on the screen. indicate.

  In the three-dimensional view Ei of FIG. 11, the first flange ma of the bent side is displayed as red, the second flange mb is yellow, and the interference area vi of both flanges is displayed as green.

  Also, an overlay editing dialog is displayed. In this overlay editing dialog, the mode display 25 for cutting the yellow second flange by making use of the first flange ma, the mode display 26 for cutting the first flange by making use of the yellow second flange, and only the green interference region vi. It is possible to select a mode display 27 for cutting, a mode display 28 for cutting the interference area Vi diagonally, a mode display 29 for cutting the interference part vi by 45 degrees, and the like. Further, the overlay edit dialog has a column for inputting a width (correction amount) for cutting the interference point vi.

  Then, when the mode display 29 for cutting the interference portion vi at 45 degrees is selected and the correction amount is input in the overlay editing dialog in FIG. 11, the three-dimensional map editing unit 18, as shown in FIG. The interference location vi (via, vbi) on the flange surface is cut at 45 degrees, and the flange surfaces are spaced according to the correction amount.

  On the other hand, the provisional development correction unit 20 reads the correction amount, its mode (mode display 29 for cutting the interference location vi at 45 degrees), and the interference location vi on the interference surface (for example, the first and second flanges). The process described in is performed.

  For example, when the three-dimensional map editing unit 18 calculates the interference location Vi (via, vib) as shown in FIG. 12 in the state where the temporary development view Bia shown in FIG. The temporary development drawing correcting unit 20 defines the interference location Vi (via, vib) in the temporary development drawing Bia as shown in FIG.

  Then, as shown in FIG. 13C, a provisional development view is obtained in which the interference location Vi (via, vib) is cut by 45 degrees.

  Further, the inverse simulation unit 19 performs interference check of the flange and the mold while sequentially opening with a predetermined mold from the last bending line.

  In this inverse simulation, for example, a three-dimensional figure showing a cross section of a three-dimensional figure as shown in FIG. 14 is obtained from the surface model and displayed on the screen. In FIG. 14, the abutting portion of the mold is the final bend line, the cross-sectional shape of the designated mold is displayed at the same time, the bending angle, the bending direction, the elongation value of the attribute information added to the bend line, An inverse simulation is performed based on the bending type and the like, and the presence or absence of interference is notified to the provisional development correction unit 20 while opening the surface. The temporary development drawing correcting unit 20 separates the surface composite drawing Bi when there is interference of the mold.

  In other words, the automatic programming device 10 according to the present embodiment is performed on the CAM side before the inverse simulation is performed on the CAD side. For this reason, since the interference by the reverse simulation can be checked before the development view including the attribute is passed to the CAM in the subsequent stage, the machining program (NC data) is generated earlier as a result.

  In addition, when the development map generation unit 21 completes the editing of the three-dimensional map and the correction of the temporary development chart by the reverse simulation, it traces the closed loop (excluding the folding line) in the temporary development chart and finally determines the trajectory forming the maximum closed loop. A development number Qi (see FIG. 15) is added and registered with a product number or the like. Attribute information such as an elongation value and a mold is added to the final developed view Qi. Along with this development view Qi, a surface model, a three-dimensional figure, dimensions, and the like are associated and registered.

  On the other hand, the CAM inputs a development drawing Qi from the CAD side, and displays a screen when the mold is assigned to the workpiece as shown in FIG.

<Embodiment 2>
FIG. 17 is a schematic configuration diagram of the second embodiment. In this example, only the main part of the second embodiment is illustrated. In the second embodiment, a cross-sectional shape generation unit 40, a dimension calculation display unit 41, and a corner part information extraction unit 42 are provided.

  As shown in FIG. 18, the cross-sectional shape generation unit 40 generates a cross-sectional view (wire frame) when the surface model is viewed from a predetermined surface side (the corner portion is a line of a different color) and displays it.

  The dimension calculation display unit 41 calculates each dimension of the cross-sectional view generated by the cross-sectional shape generation unit 40, and adds the calculation result to each line of the cross-sectional view as shown in FIG.

  The corner part information extracting unit 42 extracts corner part information (inside R, elongation value D, depth dimension) related to the sectional view from the surface model, and displays this information in the vicinity of the corner part as a numerical value.

  That is, by displaying the calculated dimensions and corner information on the cross-section of the wire frame, it is possible to confirm whether or not each surface having the correct dimensions has been input from, for example, a three-view drawing drawn in the drawing.

  Further, since the corner information is displayed with the depth dimension added, the entire dimension can be confirmed by the cross-sectional dimension.

  Further, as shown in FIG. 19, the dimension calculation display unit 41 can also display a dimension following the movement of the cursor on the screen.

  In this dimension display, for example, as shown in FIG. 20 (a), two vertices of a three-dimensional figure are indicated by a cursor, and then, as shown in FIG. 20 (b), the vertex direction first designated by the cursor is designated. Next, a line vector connecting the designated vertex directions is obtained, and, as shown in FIG. 20C, this is realized by obtaining the dimensions on the three-axis components of the line vector.

1 is a schematic configuration diagram of a sheet metal integration support system according to a first embodiment of the present invention. FIG. 3 is a schematic configuration diagram of additional CAD in the first embodiment. It is explanatory drawing explaining bending attribute information. It is explanatory drawing explaining the display of the closed loop of a screen. It is explanatory drawing explaining a surface composition process. It is explanatory drawing explaining the interlocking display of a temporary expansion figure and a three-dimensional figure. It is explanatory drawing explaining the interference location in a three-dimensional figure. It is explanatory drawing explaining the matching edit on a solid figure. It is explanatory drawing explaining the solid figure figure in the butt edit of double-sided drawing. It is explanatory drawing explaining correction of a temporary expansion view. It is explanatory drawing explaining a superposition edit screen. It is explanatory drawing explaining the correction result of a superposition edit screen. It is explanatory drawing explaining correction of the temporary expansion | deployment figure by superposition editing. It is explanatory drawing explaining the display screen by reverse simulation. It is explanatory drawing explaining the production | generation of the final expansion | deployment figure. It is explanatory drawing explaining the display screen by the side of CAM. It is a schematic block diagram of the sheet metal integrated support system of Embodiment 2. It is explanatory drawing explaining the dimension display of sectional drawing. It is explanatory drawing explaining a dimension display. It is explanatory drawing explaining the production | generation of a dimension display. It is a schematic block diagram of the conventional machine tool line control system.

Explanation of symbols

10 Automatic programming device 11 CAD
12 CAM
13 Data sending / receiving part 14 Figure shape input part (screen)
DESCRIPTION OF SYMBOLS 15 Surface composition part 16 3D figure production | generation part 17 3D figure formation part 18 3D figure edit part 19 Inverse simulation part 20 Temporary development drawing correction part 21 Development figure production part

Claims (7)

Each surface composing the input solid is displayed on the screen based on the two-dimensional three-view drawing. When the reference surface and the butting surface are specified on this screen, a temporary development view that matches both surfaces is displayed. In addition to obtaining a three-dimensional figure that has been surface-painted by bending the temporary development view based on bending conditions, the closed-loop and bending lines of the outer frame of the temporary development view are extracted in conjunction with a region different from the temporary development view. An automatic programming device that sends the developed view to the CAM at the subsequent stage,
The CAD that forms the front stage of the automatic programming device is:
A graphic editing unit that performs interference calculation between each three-dimensional surface on a three-dimensional map that is a surface model for generating the three-dimensional figure, and informs the surface of the interference portion and the interference area of the surface as an interference calculation result When,
In order from the final bend line of the three-dimensional view for generating the three-dimensional figure, in order to perform interference calculation while performing reverse simulation by designating the mold, an inverse simulation unit that informs the surface in contact with the mold as the interference calculation result,
Read the interference calculation result of the graphic editing unit or the inverse simulation unit, and correct the temporary development view based on the interference calculation result,
An automatic programming apparatus comprising: means for re-generating the three-dimensional view, which is a surface model bent under the bending condition, each time the provisional development view is modified. When sides of the two-dimensional closed loops displayed on the screen are specified, either one is used as a reference plane, and the other plane is overlapped with the reference plane having an overlap region between the extension value and the plate thickness. And a surface synthesis unit for obtaining a provisional development with a bending line in the overlap region,
A three-dimensional diagram generating unit that defines a two-dimensional provisional development obtained by the surface synthesis unit in a three-dimensional coordinate system, and generates a surface model to which a plate thickness is added by affine transformation of the three-dimensional data;
A three-dimensional figure generation unit that displays a three-dimensional figure obtained by removing the hidden surface of the surface model obtained by the three-dimensional figure generation unit, and displays a designated surface in a specified color, The automatic programming apparatus according to claim 1, wherein a three-dimensional figure is obtained.   3. The automatic programming apparatus according to claim 1, wherein attribute information including an elongation value, a material, a bending mold, and a bending type is added to the temporary development view and the three-dimensional view. When the other surface is abutted against the reference surface in the surface synthesis unit, it is determined whether an elongation value condition including a specified bending angle, a bending direction, and an elongation value of the material exists in the elongation value information file. If present, an elongation value information reading unit for setting the elongation value condition in the surface synthesis unit;
When it is determined that the elongation value condition does not exist in the elongation value information reading unit, a bending simulation is performed by an elasto-plastic finite element method based on the elongation value condition, and the elongation value is transmitted to the surface synthesis unit. 3. The automatic programming apparatus according to claim 2, further comprising a finite element method unit that sets and stores the elongation value information file in the elongation value information file.   2. The automatic programming apparatus according to claim 1, further comprising a data transmission / reception unit configured to transmit the temporary development view and the three-dimensional view in a predetermined format to the outside through a line. On the computer,
Means for displaying on a screen each surface constituting a solid inputted based on a two-dimensional three-view diagram;
When a reference surface and a butt surface are specified on the screen, a means for calculating an overlapping area in accordance with the bending condition on both surfaces and calculating and displaying a temporary development view that has been butted in this overlapping area;
Means for defining the provisional development in three-dimensional coordinates based on the bending condition, and performing an affine transformation operation on the three-dimensional coordinates;
Means for generating a three-dimensional surface model obtained by calculating a thickness direction of the data after the affine transformation;
Means for performing an interference calculation between the three-dimensional surfaces on the three-dimensional map, and notifying the surface of the interference portion and the interference area of the surface as a first interference calculation result;
Means for performing interference calculation while performing reverse simulation by designating a mold in order from the last bending line of the three-dimensional view, and notifying a surface in contact with the mold as a second interference calculation result;
Means for reading the first and second interference calculation results and performing a correction calculation on the temporary development based on the interference calculation results;
Means for re-generating the three-dimensional view bent under the bending conditions each time the provisional development is corrected;
Means for extracting the outer frame loop and the bending line of the modified temporary development view, and sending the result as development view data;
The computer-readable recording medium which recorded the program for implement | achieving the function as. Each surface composing the input solid is displayed on the screen based on the two-dimensional three-view drawing. When the reference surface and the butting surface are specified on this screen, a temporary development view that matches both surfaces is displayed. In addition to obtaining a three-dimensional figure that has been surface-painted by bending the temporary development view based on bending conditions, the closed-loop and bending lines of the outer frame of the temporary development view are extracted in conjunction with a region different from the temporary development view. An automatic programming device that sends the developed view to the CAM at the subsequent stage,
The CAD that forms the front stage of the automatic programming device is:
A figure editing unit that performs an interference calculation between the three-dimensional surfaces on the three-dimensional diagram for generating the three-dimensional figure, and informs the surface of the interference portion and the interference area of the surface as an interference calculation result;
In order from the final bend line of the three-dimensional view for generating the three-dimensional figure, in order to perform interference calculation while performing reverse simulation by designating the mold, an inverse simulation unit that informs the surface in contact with the mold as the interference calculation result,
Read the interference calculation result of the graphic editing unit or the inverse simulation unit, and correct the temporary development view based on the interference calculation result,
Means for regenerating the three-dimensional view bent under the bending conditions each time the provisional development is corrected;
When sides of the two-dimensional closed loops displayed on the screen are designated, one of them is used as a reference surface, and the reference surface has an overlap region of an extension value and a thickness of the other surface. A surface synthesis unit that obtains a temporary development with a bend line in the overlap region,
A three-dimensional diagram generating unit that defines a two-dimensional provisional development obtained by the surface synthesis unit in a three-dimensional coordinate system, generates a surface model by bending the three-dimensional data by three-dimensional affine transformation and adding a plate thickness. When,
A three-dimensional figure generation unit that displays a three-dimensional figure obtained by removing the hidden surface of the surface model obtained by the three-dimensional figure generation part, while displaying a designated surface in a specified color;
Elongation value information file that stores elongation value conditions including bending angle, bending direction, and elongation value of material,
When the other surface is abutted against the reference surface in the surface synthesis unit, it is determined whether an elongation value condition including a specified bending angle, bending direction, and material elongation value exists in the elongation value information file. And, if present, an elongation value information reading unit for setting the elongation value condition in the surface composition unit,
When it is determined that the elongation value condition does not exist in the elongation value information reading unit, a bending simulation is performed by an elasto-plastic finite element method based on the elongation value condition, and the elongation value is transmitted to the surface synthesis unit. An automatic programming apparatus comprising: a finite element method unit that sets and stores the elongation value information file in the elongation value information file.

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