JP4402776B2 - Sheet metal composite development drawing generation method using general-purpose two-dimensional CAD, general-purpose two-dimensional CAD system, and storage medium storing program of sheet-metal composite drawing generation method using general-purpose two-dimensional CAD - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention uses a general-purpose two-dimensional CAD that can easily and accurately obtain a composite development drawing used for a sheet metal even if it is a general-purpose two-dimensional CAD having only two-dimensional geometry and attribute information and can be customized. It relates to sheet metal composition drawing generation.
[0002]
[Prior art]
Conventionally, there are mainly the following two methods for inputting a sheet metal product shape and its development as CAD data.
[0003]
(1) A sheet metal function command for general-purpose two-dimensional CAD (CAD not dedicated to sheet metal) that is handled by replacing the projection drawing of the object as it is with a numerical sequence of two-dimensional coordinates in accordance with the projection method of the third angle method. How to add
As a function for sheet metal, commands such as “surface composition” and “surface alignment” are simply added to a general-purpose two-dimensional CAD. For example, bending information is added to two-dimensional geometric information and held.
[0004]
In recent years, there have been many products that can be customized with general-purpose two-dimensional CAD to add functions for specific purposes. Many of these have a very rich two-dimensional drawing and editing function as a basic CAD function, and can be easily joined to many systems as an open system.
[0005]
(2) How to build your own CAD system dedicated to sheet metal
A dedicated CAD system with phase information as a surface in addition to two-dimensional geometric information is constructed exclusively for sheet metal. In addition, it has functions such as “surface composition” and “surface composition”.
[0006]
[Problems to be solved by the invention]
However, in general, a general-purpose two-dimensional CAD can hold and handle only geometric information expressing a shape and information of an additional attribute thereof.
[0007]
For this reason, in the method of adding a command for making a general-purpose two-dimensional CAD function for sheet metal, the shape development of a composite development drawing created by surface synthesis or the like is a special feature that maintains the consistency of the data. Can only be done with simple commands.
[0008]
In other words, each time the shape of the composite development is edited, the operator must input a special command that can maintain the alignment between the bend line and the opposite side, which is very time-consuming. It was.
[0009]
If this special command is used to make a unique CAD system dedicated to sheet metal, this system becomes a closed system, and it is necessary to newly create two-dimensional drawing and editing functions one by one.
[0010]
For this reason, there is a problem that a basic function is poor as a general-purpose CAD, and a huge amount of man-hour is required to add a new shape edit.
[0011]
Moreover, since the basic function as a general general-purpose CAD becomes poor, there is a problem that it is not easy to join with other systems.
[0012]
The present invention has been made to solve the above problems, inherits the advantages of the drawing function and openness, which are the characteristics of general-purpose two-dimensional CAD, and facilitates CAD data representing sheet metal product shape and its developed view. An object of the present invention is to obtain a CAD system for sheet metal using a two-dimensional CAD that can be created.
[0013]
[Means for Solving the Problems]
The sheet metal composite development drawing generation method using the general-purpose two-dimensional CAD of the present invention reads the two-dimensional CAD data generated in a standard format into the internal memory, and generates a closed loop based on the two-dimensional CAD data in the internal memory. A sheet metal composition using a general-purpose two-dimensional CAD that generates a surface composition diagram for bending a product by moving a closed loop according to an editing instruction and assigning a number every time a line segment is generated in the internal memory. This is a development drawing generation method. This synthetic development drawing generation method is
(A). (B) a step of sequentially generating a bend line between lines facing each other in the surface composite drawing in the internal memory and displaying a composite development view composed of the surface composite view and the bend line; . Each time a bend line is generated, the number of the bend line and the closed loop line number satisfying a predetermined condition with the bend line interposed therebetween are read, and the bend line information corresponding to the product bend attribute information is read. Generating and storing them in a file as composite bend line information; (c). After the composite bending information is stored, when there is an instruction to display the composite development view in three dimensions, for each bend line of the composite development view, is there a line segment that meets the predetermined condition across the bend line? Determining whether or not (d). When there are opposing line segments, determining whether the opposing line segment numbers match the bending information numbers of the bend lines sandwiched between these line segments; and (e). When the number of the bend line information and the number of the line segment do not match, deleting the bend line information of the bend line from the file and deleting the bend line from the internal memory; and (f). When the opposing line segment exists and the bending line is deleted, the step (a) and the step (b) are performed again to reconstruct a new bending line between the opposing line segments;
The main point is that
[0014]
The general-purpose two-dimensional CAD system of the present invention reads the two-dimensional CAD data generated by the general-purpose two-dimensional CAD in a standard format into the internal memory, generates a closed loop based on the two-dimensional CAD data in the internal memory, and displays it. Each time a line segment is generated in the internal memory, a number is assigned, and in accordance with the editing instruction, a closed loop is generated to move the closed loop and bend the product.
[0015]
The composite development drawing creation unit, the linking unit, and the composite bend line reconstruction unit connected to the general-purpose two-dimensional CAD are included in the surface composite drawing in accordance with the composite development drawing generation instruction by the composite development drawing creation unit. Then, a bending line is sequentially generated in the internal memory between the lines that satisfy the predetermined predetermined condition, and a composite development view composed of the surface composite drawing and the bending line is displayed.
[0016]
Each time a bending line is generated by the composite development drawing creation unit, the linking processing unit reads the number of the bending line and the number of the closed-loop line segment that satisfies the predetermined condition with the bending line interposed therebetween. The bend line information corresponding to the bend attribute information is generated and stored in the file as composite bend line information.
[0017]
Then, the composite bend line reconstruction unit, after the opposing line segment determining means stores the composite bend information, when there is an instruction to display the composite developed view in 3D, for each bend line of the composite developed view, It is determined whether there is an opposing line segment that satisfies the predetermined condition.
[0018]
When there are opposing line segments for the bend line-segment number determination means, do the numbers of the opposing line segments match the bend information number in the bend line file sandwiched between these line segments? Determine if.
[0019]
When the bend line information deletion unit does not match the bend line information number and the line segment number, the bend line information is deleted from the file and the bend line is deleted from the internal memory.
[0020]
When there is a line segment that the bend line reconstruction means faces and the bend line is deleted, a new bend line is created between the facing line segments by restarting the composite development drawing creation unit and the link processing unit. To rebuild.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
In order to construct a CAD / CAM that can easily create and edit a development view for sheet metal using a general purpose two-dimensional CAD that can be customized and has only two-dimensional geometric data and attribute data. Basically, only a two-dimensional geometry information is used to express a composite development view so that it can be handled accurately.
[0022]
FIG. 1 is a schematic configuration diagram of a composite development drawing generation system for sheet metal using a general-purpose two-dimensional CAD according to the present embodiment.
[0023]
As shown in FIG. 1, the composite development view generation system for sheet metal using the general-purpose two-dimensional CAD according to the present embodiment includes a general-purpose two-dimensional CAD system 1 and a composite development view generation system 2 dedicated to sheet metal.
[0024]
The general-purpose two-dimensional CAD system 1 is a general-purpose general-purpose format in which the projection drawing of an object is directly replaced with a numerical sequence of two-dimensional coordinates in accordance with the projection method of the third angle method in DXF and IGES format stored in the file 3. A general-purpose CAD data reading unit 4 for importing two-dimensional CAD data (line type, coordinates, color, etc.) into the memory 5 (also referred to as an internal memory), and a graphic editing function unit for graphic editing of the CAD data in the memory 5 according to the input command 6, a drawing function unit 7 that draws a figure in the memory 5 according to the input command, a screen drawing function unit 8 that projects the CAD data of the memory 5 onto the projection space, and displays it on the screen 9.
[0025]
The above-described general-purpose CAD data reading unit 4 defines a closed loop based on related two-dimensional data in the memory 5. In the memory 5, each time a line segment is defined, an ID is assigned to the line segment (including a bend line). Assigned.
[0026]
The composite development drawing generation system 2 for sheet metal stores a composite development drawing command creation unit 12, a composite development drawing creation unit 13, a link processing unit 14, a composite bending line reconstruction unit 17, and bending information. Bend information file 15, butt condition file 18 in which the condition of the butt line with respect to the bend line is stored, bend line (ID), opposing line segment (ID), bend condition, etc. of memory 5 of general-purpose two-dimensional CAD system 1 And a link data file 16 in which data linked with is stored.
[0027]
The composite development view command creation unit 12 combines various commands for generating the input composite development view ("surface composition command", "surface projection command", "bending line command", etc.), Set as a composite development command.
[0028]
The composite development drawing creating unit 13 reads the connection side Ska of the reference surface Ka of the reference closed loop (hereinafter, described as a closed loop in the present description) set on the screen in the memory 5, and uses this connection side Ska as “surface”. By projecting, a bend line (dotted line) is projected onto the obtained abutting surface Kb at a position according to the bending condition, and the abutting surface Kb is moved according to the predetermined condition with respect to this bending line. 5 is displayed on the screen.
[0029]
The linking processing unit 14 is configured such that the ID of each line (two-dimensional CAD data) in the memory 5 of the general-purpose two-dimensional CAD system 1, the ID of the bending line, the bending condition, etc. (hereinafter collectively referred to as link data: the pointer is the ID of the bending line) ) In a hierarchical structure, and this is stored in the link data file 16.
[0030]
In other words, the bending line of the composite development diagram generated by the linking processing unit 14 in the composite development diagram creation unit 13 includes the ID of this bending line, the IDs of the line segments on both sides opposite to this bending line, and the bending information. Etc. are linked.
[0031]
The composite bend line reconstruction unit 17 is automatically activated when the composite development view generated by the composite development view creation unit 13 is displayed in 3D.
[0032]
The composite bend line reconstruction unit 17 reads the ID of the bend line in the memory 5 and the ID of the line segment that sandwiches the bend line when a stereoscopic display command is input. Then, the previous link data Pi corresponding to the bend line ID of the link data Qi read this time into the link data file 16 via the link processing unit 14 is allocated, and each ID of the link data Pi is assigned to the current link. It is determined whether each ID of the data Qi matches.
[0033]
When all of them do not match, the bend line generated in the memory 5 and the screen is deleted, and the previous link data Pi stored is deleted.
[0034]
Then, the composite development view command creation unit 12 is activated, the composite development view command is sent to the composite development view creation unit 3, and a new bending line is generated again in the memory 5. To generate link data Pi,
Next, each file will be described. The bending information file 15 stores the following information (referred to as composite bending line attribute information) according to the product to be bent.
[0035]
(1) Bending angle (angle formed by two surfaces in degrees)
(2) Inside / outside types (inside / inside / outside / inside / inside / outside / outside / outside)
(3) Elongation value (value in the type of outer 1)
(4) Value of R in
(5) Bending information
In the link data file 16, for example, as shown in FIG. 2, if a left surface (also referred to as a butting surface kb) is obtained by “surface-projecting” with respect to a right surface (also referred to as a reference surface ka), a link is obtained. As shown in FIG. 3 by the attaching processing unit 14, the ID of the butt line (hereinafter referred to as the connecting side Ska) of the reference plane ka (ID number in FIG. 2 is “0”) and the ID of the bending line La The ID of the connection side Skb, the bending attribute information (storage address of the file 15), and the like are registered hierarchically.
[0036]
The matching condition file 18 stores the following conditions.
[0037]
(1) The connecting side Ski (Ska, Skb) with respect to the bending line La must be a straight line parallel to the bending line La at a position separated by a distance determined by the elongation value and the inner and outer types. ...... Connection side condition ms
(2) The length of the bend line La is defined as the length between points where the ends of the connecting sides with respect to the bend line La are projected onto the bend line La. ...... Condition bending line determination condition mk
(3) On the screen, the first designated surface is the reference surface, and the next designated surface is the butt surface.
[0038]
The sheet metal composite development drawing generation system using the general-purpose two-dimensional CAD configured as described above will be described below with reference to the flowcharts of FIGS.
[0039]
First, the operator uses the general-purpose two-dimensional CAD system 1 to read the two-dimensional CAD data from the file 3 by the general-purpose CAD data reading unit 4 (S401) and define it in the memory 5 (S402).
[0040]
At this time, an ID is assigned to each line segment constituting the closed loop in the memory 5.
[0041]
Next, the screen drawing function unit 8 displays the two-dimensional CAD data of the memory 5 on the screen (S403). For example, a rectangular figure is displayed.
[0042]
Next, the operator performs “face-out” using the drawing function unit 7 and the screen drawing function unit 8 to display, for example, two rectangles as shown in FIG. 6 (S404). In FIG. 6, the right surface is the reference surface Ska, and the left surface is the butting surface Skb.
[0043]
The operator then customizes a general-purpose two-dimensional CAD and inputs a plurality of commands for creating a composite development view. These commands are set as a composite development view command in the composite development view command creation unit 12.
[0044]
Next, the composite development process and the linking process will be described. The composite development drawing creating unit 13 reads out the bending information ma to be the bending line La of the current product from the file 15 and sets it inside, and sets the above-mentioned connection side condition ms and bending line determination condition mk (S410). .
[0045]
This bending information
(1) Bending angle (angle formed by two surfaces in degrees)
(2) Inside / outside types (inside / inside / outside / inside / inside / outside / outside / outside)
(3) Elongation value (value in the type of outer 1)
(4) Value of R in
(5) Bending information
Etc.,
As for the connection side condition ms, the connection side Ski (Ska, Skb) with respect to the composite bend line La must be a straight line parallel to the composite bend line La at a position separated by a distance determined by the elongation value and the inner and outer types.
[0046]
The composite bend line determination condition mk is
(2) The length of the combined bend line La is the length between the points where the ends of the connecting sides with respect to the combined bend line La are projected onto the combined bend line La.
[0047]
It is.
[0048]
Next, when the operator designates two lines of two surfaces to be connected on the screen using the two-dimensional CAD system 1, the surface composite development drawing creating unit 13 obtains the IDs of the designated two lines from the memory 5. The IDa and IDb of the connection sides Ska and Skb are set inside (S411).
[0049]
Next, the composite development drawing creation unit 13 reads line data corresponding to IDa and IDb from the memory 5 of the two-dimensional CAD system 1 (S412). Next, the inside / outside type map and the elongation value maq of the bending information ma are read (S413).
[0050]
Then, a bending line La is defined on the butt surface kb based on the inner / outer type map and the elongation value maq (S414), and an ID is assigned to the bending line La.
[0051]
As shown in FIG. 7A, the bend line La is defined by, for example, extending the end point of the connection side Ska of the reference surface Ka and the start point of the connection side Skb of the abutting surface Kb to the above-described inner / outer type map. A straight line connecting the projection points aL and bL is defined as a bend line La by projecting on the butt surface Kb in parallel at a distance based on the value maq.
[0052]
Next, the linking processing unit 14 finds from the memory 5 a line segment that is parallel to the bending line La and satisfies a predetermined condition and sandwiches the bending line La (S415).
[0053]
Next, link data obtained by linking the connection sides Ska and Skb, the composite bending line La, and the bending information ma is stored in the file 16 (S416). For example, as shown in FIG. 3, the ID of the connection side Ska of the reference surface ka, the ID of the connection side Skb of the butt surface kb, the bending attribute information, and the like are hierarchically registered in the ID of the composite bending line La.
[0054]
Next, the composite development drawing creation unit 13 sets the reference planes Ka and Kb on the memory 5 so that the connection sides Ska and Skb satisfy the inner / outer type map and the elongation value maq with respect to the synthetic bending line La. It is moved and displayed on the screen (S417).
[0055]
For example, as shown in FIG. 7B, the reference surface Ka and the butting surface Kb are displayed at a predetermined interval across the composite bending line La. In this example, the composite bending line La is indicated by a dotted line.
[0056]
That is, even if the general-purpose two-dimensional CAD system 1 is used, the bend line can be a line segment having bend information.
[0057]
Next, the bend line reconstruction process will be described. This bend line reconstruction process is performed by changing the bend line La or creating a new composite bend line using the graphic editing function unit 6 of the general-purpose two-dimensional CAD system 1. Therefore, the composite bend line generated in advance does not satisfy the above link condition. Therefore, the bend line is reconstructed using the composite bend line reconstruction unit 17.
[0058]
First, the operator uses the general-purpose two-dimensional CAD system 1 to move the surface and input a stereoscopic display command. The composite bend line reconstruction unit 17 is activated by this stereoscopic display command, and the IDs, coordinates (start point, end point), line type, etc. of all bend lines Lai (La1, La2,...) Are read (S501). . All the bending lines are collectively referred to as a synthetic bending line Ra. Further, in this process, it is assumed that after the development view is generated, graphic editing (change of bending line, change of surface, etc.) is performed by the operator, and the composite development view shown in FIG.
[0059]
Next, the first bend line Lai (La1) is set in the composite bend line Ra (S502), and the two segments Lki (LKa, LKb) satisfying the connection side condition ms with the composite bend line Lai interposed therebetween. ) Is determined (S503).
[0060]
This line segment is also referred to as a connection side candidate Lki, and a line segment (straight line) parallel to the bend line Lai at a position separated from the bend line Lai by a distance determined from the elongation value and the inner and outer types according to the above conditions is Projecting from the start point to the end point of Lai up and down (expression when a in FIG. 8 is referred to), the overlapping line segment is set as a connection edge candidate Lki. That is, the connection side candidate Lki is determined only by the information of the two-dimensional data line segments in the memory 5. The tolerance at this time is set to 0.001 mm, and if even a part is applied to the bending line Lai, the connection side candidate Lki is set.
[0061]
If it is determined in step S503 that there are two line segments Lki (LKa, LKb), a connection edge candidate register (not shown) is provided in the main memory (not shown), and the connection edge candidate register is stored in the connection edge candidate register. Two line segments Lki (connection edge candidates) are stored (S504). For example, the ID of the connection side candidate Lki (Lka, Lkb) is stored.
[0062]
Next, the bending line Lai and the two line segments Lki (connection edge candidates) set in step S502 are set as the current link data Qi (Lka ID, two line segment Lki ID) (S505). Then, the previous link data Pi corresponding to the bend line Lai is read from the link data file 16 (S506).
[0063]
Next, it is determined whether or not the link data Pi matches the current link data Qi (S507).
[0064]
In step S507, if the two link data do not match, an erasure register is generated in the main memory, and the bend line Lai set in step S502 is stored (S508).
[0065]
Then, it is determined whether there is another bend line from the combined bend line Ra in step S501 (S509). If it is determined that there is another bend line, the bend line is updated to the next bend line (S510). ), The process returns to step 501. If it is determined in step S507 that both link data match, the connection edge candidate Lki (Lka, Lkb) of the connection edge candidate register is determined as the connection edge Ski (Ska, Skb), and the connection is determined. A side register is generated, the connection side Ski (Ska, Skb) is stored (S511), and the process returns to step S509. That is, there are two lines (connection edge candidates) satisfying a predetermined condition sandwiching the bending line Lai, and link data Qi composed of the IDs of these two lines and the bending line Lai is the link data Pi generated last time. When the two match, the two connection edge candidates are determined as the connection edge Ski.
[0066]
For example, when (a) of FIG. 8 is used, the bending line La1 is not sandwiched between two line segments by this process, and therefore the ID of the bending line La1 is stored in the erasing register. Further, since the current link data Qi of the bending lines La2 and La3 does not coincide with the previous link data Pi, the IDs of these bending lines are also stored in the erasing register.
[0067]
On the other hand, since the line segment Lka2 and the line segment Lkb2 are connection side candidates for the bending line La2, the IDs of the connection side candidate Lka2 and the line segment Lkb2 are stored in the connection side candidate register. For the bend line La3, the line segment Lka3 and the line segment Lkb2 become connection side candidates and are stored in the connection side candidate register.
[0068]
Next, in step S509, when it is determined that there is no other bend line Lai, the ID of the bend line stored in the erasing register is read, and the bend line of this ID is erased from the memory 5 and is displayed on the screen. At the same time, the link data Pi of this ID is deleted from the link data file 16 (S512). That is, the bending lines Lka1, Lka2, and Lka3 are once deleted from the screen.
[0069]
Next, the connection sides Ski of the connection register are sequentially sent to the composite development drawing creation unit 3 (S512). In this description, the line segment Lka2 (Ska2), the line segment Lkb2 (Skb2), the line segment Lka3 (Ska3), and the line segment Lkb2 (Skb2) are sent in this order.
[0070]
Then, each time this connection edge Ski is sent, the composite development view command creation unit 12 is activated to cause the composite development view creation unit 3 to send out the composite development view command to generate a new composite development view (S514). This command for starting the composite development view command creation unit 12 is referred to as a rebuild command in this description.
[0071]
The composite development drawing creation unit 3 inputs the connection side Ski (ID) from the composite bending line reconstruction unit 17, and has the ID of the connection side Ski (Skai, Skbi) with the input of the composite development drawing creation command. The line segment ki in the memory 5 is allocated, and a new bend is projected from the start point and end point of both line segments ki onto a region sandwiched between both line segments ki in accordance with predetermined conditions (elongation value, inner and outer types). A line Lai is drawn in the memory 5. A new ID is assigned to the new bend line Lai.
[0072]
Each time the linking processing unit 14 generates a new bend line Lai, the link data Pi is combined with the ID of the bend line Lai, the ID of the connection side Skai, and the ID of the connection side candidate Skbi. Register in file 16.
[0073]
That is, when a developed view is generated using a general-purpose two-dimensional CAD and then the developed view is corrected by an operator, the coordinate value (two-dimensional data) of the line segment (one or two line segments) facing the bending line is corrected. ) To determine whether or not the predetermined condition is satisfied. If the predetermined condition is not satisfied, the general-purpose two-dimensional CAD system is used to erase as an unnecessary bending line. In addition, in the region between the two line segments satisfying the predetermined condition, the composite development drawing creation unit 3 generates a new dotted line using a general-purpose two-dimensional CAD system, and the bending information is associated with the dotted line to create a new line. The bend line and the ID of the bend line and the IDs of the two line segments are registered as link data, and when there is some editing, the bend line can be reconstructed at the correct position using this link data Pi. I have to.
[0074]
With regard to the developed view on the screen, in the example of FIG. 8A, the bending lines La1 and La2 are deleted, and the bending line La3 is within a range Da where the connection sides Ska2 (candidate Lka2) and Skb2 (Lkb2) overlap. Is divided, and the bend line La3 is divided in a range Db where the connection sides SKa3 (candidate Lka3) and Skb2 (Lkb2) overlap, and the rest is deleted.
[0075]
Accordingly, as shown in FIG. 8B, a new bend line La4 is drawn in a range where the connection side Ska2 (candidate Lka2) and the connection side Skb2 (candidate Lkb2) face each other, and the connection side Ska3 (candidate Lka3). And a new bend line La5 are drawn in a range where the connection side Skb2 (candidate Lkb2) faces.
[0076]
A series of processes for reconstructing the bending line will be described with reference to a block diagram as shown in FIG. In FIG. 9, the memory 5, in which the two-dimensional CAD data is defined, the development drawing creation unit 3, and the composite development drawing command creation unit 12 will be described.
[0077]
The composite bend line reconstruction unit 17 includes a facing destination presence / absence determination unit 20, a bend line-segment number determination unit 21, a bend line information erasure unit 22, and a reconstruction command unit 23.
[0078]
Each time the stereoscopic display command is input, the facing destination presence / absence determining means 20 reads the ID, coordinates (start point, end point), line type, etc. of all the bending lines Lai (La1, La2,...) From the memory 5. The first bend line Lai is set in the composite bend line Ra, and it is determined whether there are two line segments Lki (LKa, LKb) that satisfy the connection side condition ms with the composite bend line Lai interposed therebetween. .
[0079]
When the two line segments Lki do not exist, the set bending line Lai (ID) is stored in the erasing register.
[0080]
Further, when it is determined that there are two line segments Lki (LKa, LKb), the two line segments Lki (connection side candidates) are stored in the connection side candidate register, and it is determined that the connection candidate exists. -Inform the line segment number judging means 21.
[0081]
When there are two line segments Lki, the bend line-line segment number judging means 21 uses the set bend line Lai and the two line segments Lki (connection edge candidates) as the current link data Qi (Lka ID, It is determined whether the ID of the two line segments Lki is the same as the previous link data Pi.
[0082]
If both link data do not match, the bend line Lai set in the erasing register is stored. When it is determined that both link data match, the connection side candidate Lki (Lka, Lkb) of the connection side candidate register is determined as the connection side Ski (Ska, Skb), and this connection side Ski ( Ska, Skb) is stored.
[0083]
When there is no other bend line Lai, the bend line information erasing means 22 reads the ID of the bend line stored in the erasing register, deletes the bend line of this ID from the memory 5 and deletes it from the screen. At the same time, the link data Pi of this ID is deleted from the link data file 16.
[0084]
The reconstruction command means 23 sequentially sends the connection side Ski (ID) of the connection register to the composite development view creation unit 3 and reconstructs it into the composite development view command creation unit 12 each time this connection side Ski is sent out. A command is sent out and activated to cause the composite development drawing creation unit 3 to send out a composite development drawing command to generate a new composite development drawing.
[0085]
Therefore, even if the bending line of the composite development view (actually a simple composite view) on the screen is changed by two-dimensional CAD, an accurate composite development view can be easily reconstructed.
[0086]
【The invention's effect】
As described above, according to the present invention, after generating a composite development drawing in which a bending line is drawn with respect to a surface composite drawing generated by two-dimensional CAD, the number of the bending line and a predetermined condition for sandwiching the bending line are set. The number of two line segments to be filled is linked and stored.
[0087]
Then, when an instruction to stereoscopically display the composite development view is input, whether or not there are two line segments that satisfy the predetermined condition facing the bend line of the current composite development view on the screen is displayed. Judging from the coordinate value of the minute, if there is no line segment satisfying the predetermined condition, the current bend line and the link data of this bend line are deleted.
[0088]
When two line segments exist, the current bend line number and the two line segment numbers sandwiching the bend line are read as current link data and stored as the current link data. If the previous link data does not match, the current bend line and the previous link data are deleted, and a new bend line is generated between the two line segments to generate link data.
[0089]
For this reason, when the operator changes the composite development view for some reason, if a command for stereoscopic display is input, an unnecessary bend line that does not satisfy the predetermined matching condition and a bend line that does not satisfy the link relationship are displayed. It is automatically removed, and a new bend line is automatically reconstructed between the two line segments that satisfy the predetermined condition.
[0090]
Therefore, even if a general-purpose two-dimensional CAD is used, it is possible to easily obtain a composite development view without using a special command. The effect that an accurate composite development diagram is reconstructed is obtained.
[0091]
In addition, since no special command is used, the basic function as a general general-purpose CAD can be sufficiently exhibited, and the connection with other systems is easy.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a composite development drawing generation system for sheet metal using a general-purpose two-dimensional CAD according to the present embodiment.
FIG. 2 is an explanatory diagram illustrating connection sides in a link data file.
FIG. 3 is an explanatory diagram illustrating the structure of link data in a link data file.
FIG. 4 is a flowchart for explaining the operation of the composite development drawing generating system for sheet metal according to the present embodiment.
FIG. 5 is a flowchart for explaining the operation of the composite development drawing generating system for sheet metal according to the present embodiment.
FIG. 6 is an explanatory diagram for explaining the surface area when the graphic editing function is used.
FIG. 7 is an explanatory diagram illustrating a process of generating a composite development diagram.
FIG. 8 is an explanatory diagram illustrating reconstruction of a composite bending line in the present embodiment.
FIG. 9 is a block diagram of the algorithm of the present embodiment.
[Explanation of symbols]
1 General-purpose two-dimensional CAD system
2 Composite sheet development system for sheet metal
5 memory
6 Figure editing function section
7 Drawing function
8 Screen drawing function part
12 Compositing development command creation part
13 Composite development drawing creation part
14 Linking processor
17 Composite bending line reconstruction part
18 Matching condition file
16 Link data file
20 Opposing destination presence / absence judging means
21 Bending line-segment number judgment means
22 Bending line information erasing means
23 Restructuring command means

Claims (10)

Two-dimensional CAD data generated in a standard format is read into an internal memory, a closed loop based on the two-dimensional CAD data is generated and displayed in the internal memory, and a number is generated each time a line segment is generated in the internal memory. A method for generating a composite development drawing of a sheet metal using a general-purpose two-dimensional CAD for generating a surface composite drawing for bending the product by moving the closed loop according to the allocation and editing instructions,
a. A step of sequentially generating a bend line between the lines satisfying a predetermined condition in the surface composite view in the internal memory and displaying a composite development view composed of the surface composite view and the bend line;
b. Each time the bend line is generated, the number of the bend line and the number of the closed-loop line segment satisfying the predetermined condition with the bend line interposed therebetween are read and the bend corresponding to the bend attribute information of the product is read. Generating line information and storing them in a file as composite bending line information;
c. After the composite bending information is stored, when there is an instruction to stereoscopically display the composite development view, for each bend line of the composite development view, a line segment that meets the predetermined condition across the bend line Determining whether or not exists,
d. When the opposing line segments are present, determining whether the opposing line segment numbers match the bending information numbers of the bend lines sandwiched between these line segments; and
e. When the bend line information number and the line segment number do not match, deleting the bend line information of the bend line from the file and deleting the bend line from the internal memory; and
f. When the opposing line segment exists and the bend line is deleted, the step a and the step b are performed again to reconstruct a new bend line between the opposing line segments. A method for generating a composite development view of a sheet metal using a general-purpose two-dimensional CAD. 2. The general-purpose two-dimensional according to claim 1, further comprising a step of performing only the step e and deleting the bending line and bending information when there is no line segment facing the bending line. A method for generating a composite development view of a sheet metal using CAD. 3. The method of generating a composite developed view of a sheet metal using a general-purpose two-dimensional CAD according to claim 1, wherein the step b is performed every time there is an instruction to generate a composite developed view. In the step f, when the opposing line segment exists and the bending line is deleted, an instruction to generate the composite diagram is generated, and the steps a and b are performed again. A method for generating a composite development view of a sheet metal using the two-dimensional CAD according to claim 1, 2 or 3. The predetermined condition is:
5. The general-purpose two-dimensional CAD according to claim 1, comprising: a bending angle formed by the two surfaces, an inner / outer type, an inner R, an elongation value, and a distance condition. Composite development drawing generation method. Two-dimensional CAD data generated in a standard format is read into an internal memory, a closed loop based on the two-dimensional CAD data is generated and displayed in the internal memory, and a number is generated each time a line segment is generated in the internal memory. A general-purpose two-dimensional CAD for generating a composite surface for folding and bending the product by moving the closed loop according to the allocation and editing instructions;
In accordance with an instruction to generate a composite development view, bend lines are sequentially generated in the internal memory between lines that satisfy predetermined conditions in the surface composite view, and the surface composite view and the bend line are generated. A composite development drawing creation unit for displaying a composite development drawing comprising:
Each time a bend line is generated in the composite development drawing creation unit, the bend line number and the closed loop line number satisfying the predetermined condition with the bend line interposed therebetween are read, and the bend attribute of the product is read. A link processing unit that generates bend line information corresponding to the information and stores them in a file as composite bend line information;
After the composite bending information is stored, when there is an instruction to stereoscopically display the composite development view, for each bend line of the composite development view, a line segment that meets the predetermined condition across the bend line Opposing line segment determining means for determining whether or not exists,
A bending line for determining whether or not the number of the opposing line segment and the number of the bending information of the file of the bending line sandwiched between these line segments match when the opposing line segment exists. A line number determination means;
Bend line information deleting means for deleting the bend line information from the file and deleting the bend line information from the file when the bend line information number and the line segment number do not match; ,
When the opposing line segment exists and the bend line is deleted, the composite development drawing creation unit and the linking processing unit are activated again to create a new bend line between the opposing line segments. A general-purpose two-dimensional CAD system having a composite bend line reconstructing unit comprising a bend line reconstructing means for reconstructing. When the opposing line segment determining means determines that there is no opposing line segment across the bend line, it informs the bend line information deleting means of the number of the bend line assigned by the general-purpose two-dimensional CAD. The general-purpose two-dimensional CAD system according to claim 6, wherein the bend line and the bend information are deleted. The predetermined condition is:
The general-purpose two-dimensional CAD system according to claim 6 or 7, comprising a bending angle formed by the two surfaces, an inner / outer type, an inner R, an elongation value, and a distance condition. 2D CAD data generated in a standard format is read into an internal memory, a closed loop based on the 2D CAD data is generated and displayed in the internal memory, and a number is assigned to the line segment generated in the internal memory, A storage medium used in a general-purpose two-dimensional CAD system for generating a surface composite diagram for bending the product by moving the closed loop according to an editing instruction,
a. A step of causing the internal memory to sequentially generate a bend line between lines that satisfy predetermined predetermined conditions in the surface composite view, and displaying a composite development view composed of the surface composite view and the bend line;
b. Each time the bend line is generated, the number of the bend line and the number of the closed-loop line segment satisfying the predetermined condition with the bend line interposed therebetween are read and associated with the bend attribute information of the product. Generating bend line information and storing them in a file as composite bend line information;
c. After the composite bending information is stored, when there is an instruction to stereoscopically display the composite development view, for each bend line of the composite development view, a line segment that meets the predetermined condition across the bend line The process of determining whether or not exists,
d. When the opposing line segments exist, determining whether the opposing line segment numbers match the bending information numbers of the bend lines sandwiched between these line segments; and
e. When the bend line information number and the line segment number do not match, the bend line information of the bend line is deleted from the file and the bend line is deleted from the internal memory; and
f. When the opposing line segment exists and the bend line is deleted, the step a and the step b are performed again to reconstruct a new bend line between the opposing line segments;
g. A sheet metal using a general-purpose two-dimensional CAD, characterized in that when there is no line segment opposing the bend line, only the step e is performed to delete the bend line and bend information. A storage medium storing a program for a composite diagram generation method. The predetermined condition is:
10. A sheet metal composition drawing generation method using a general-purpose two-dimensional CAD according to claim 9, comprising a bending angle formed by the two surfaces, an inner / outer type, an inner R, an elongation value, and a distance condition. A storage medium that stores

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