JP3224375B2 - Sheet metal model molding shape recognition method and apparatus, and storage medium storing program of sheet metal model molding shape recognition method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for automatically recognizing a molded shape of a three-dimensional model in a three-dimensional CAD system, and more particularly, to a molded shape of a three-dimensional model of sheet metal in a three-dimensional CAD system. The present invention relates to a method and apparatus for automatically recognizing and adding processing attribute information.

[0002]

2. Description of the Related Art Generally, for example, in sheet metal processing, N
Forming, which is a partial press working performed by a C turret punch press, has a very important meaning in terms of cost reduction of parts. Picking up the punch position, direction, and the like of the molding die from the drawing to define the processing is a task that requires a large number of man-hours and is likely to cause careless mistakes.

[0003] When the operation is performed in a two-dimensional drawing, the design side expresses a molding process such as burring in the drawing by a symbol such as a multiple circle, and the CAM reads this, and the CAM reads it. This method has been performed by embedding information such as a mold name and automating processing allocation to generate NC data.

According to this method, it is not necessary for an NC programmer to search for a special processing portion which is a forming process while reading the drawing, and to set the processing information by manual operation. Was carried out with the aim of reducing emissions.

[0005] The design is changed from two-dimensional CAD to three-dimensional C.
In the case of transition to AD, it is difficult to represent a symbol on a model and data of an attribute such as a symbol cannot be converted. It was a means of transmitting processing information.

Alternatively, three-dimensional CAD used on the design side
The same problem as described above has been solved by arranging the same device on the CAM side and constructing a CAM system thereon.

[0007]

However, such a conventional method has the following problems.

That is, in a three-dimensional CAD, when a special hole shape is used as a substitute for a symbol, there is a problem that it is difficult for an NC programmer to visually determine whether the hole is formed or another hole. In addition, there is a problem that the three-dimensional model is different from the completed shape, and cannot check the interference of the formed shape and the like.

[0009] For the above-mentioned reason, there is a problem that the merits of the three-dimensional CAD conversion on the design side are hindered.

On the other hand, on the CAM side, the same three-dimensional CAD as the design is used.
Has been established in-house in the same manufacturer, but in the case of subcontractors with multiple ordering sources, it is necessary to introduce 3D CAD by the number of ordering sources.
A major problem occurred during operation acquisition.

Further, the current data conversion standard (for example,
(STEP etc.), practically, has not yet come out of the solid data exchange standard, and the standard of features such as molding has not yet been scheduled, so without waiting for the standardization of this data conversion standard. In addition, the three-dimensional design department is rapidly progressing, and there is a problem that a huge amount of accumulated data remains even when a practical standard is put into operation.

[0012] Therefore, in realizing the three-dimensional sheet metal CAD / CAM, the same three-dimensional as the actual product shape, independent of the attribute.
A method for automatically extracting a molding attribute from a three-dimensional model shape has been desired.

[0013]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems.
Data relating to a plurality of types of three-dimensional CAD models is converted and restored to a specific three-dimensional CAD, or a molded part existing in a sheet metal model, which is a three-dimensional model of a product, created by the three-dimensional CAD. A method for recognizing a molded shape that is a shape and adding attribute information, wherein a program processes the sheet metal model on a surface basis in order to perform processing for recognizing the molded shape existing in the sheet metal model. A sheet metal model capturing step of capturing in an area where
For the sheet metal model, a basic attribute data adding step of adding basic attribute data, which is data on a table side of a material, a sheet thickness, and a development view, and A group of molded shape surfaces that are a group, a group of plate thickness surfaces that are a group of plate thickness surfaces, and a development target surface group that includes a surface group that is the front surface of the sheet metal model and a back surface group that is the back surface of the sheet metal model. A sheet metal shape recognition process for recognizing the above, the sheet thickness surface group, the development target surface group, and the molding shape surface group are joined by continuous surfaces to form a plate thickness shape, a development target surface shape,
And a surface joining step of generating a formed shape, a forming shape classification step of classifying each of the same shaped shapes from among a plurality of types of the formed shapes and grouping them, and a geometric shape and material of the formed shapes A molding shape identification step of identifying the type of molding existing in the product from the sheet thickness, generating attribute information corresponding to the molding type and temporarily storing the attribute information, and the attribute information temporarily stored And an attribute information adding step of adding to the element relating to the sheet metal model so that NC data for processing a product can be created. The forming shape specifying step includes a learning shape registered in a learning shape database. , With reference to the material and plate thickness, in the same learning shape as the molded shape, if the material and the plate thickness match,
The automatic attribute information storing step of reading and temporarily storing attribute information indicating the registered die shape, die angle, and vertical direction of the molded shape corresponding to the learning shape matches the above-described conditions. If there is no learning shape, a method for manually recognizing the shape of a sheet metal model including manually inputting attribute information or newly registering in a learning shape database and temporarily storing the attribute information is provided. .

According to a second aspect of the present invention, in the sheet metal shape recognizing step, when the surface forming the formed shape is a curved surface other than a cylindrical surface, b: a cylinder connected directly to a plane instead of a continuation of a tangent plane. In the case of a surface, c: when the surface is connected to the curved surface other than the cylindrical surface all around, d: when the surface is connected to the cylindrical surface connected directly to the plane instead of continuous with the tangent plane, and e: the above Any of a to f when the surface is connected to the hole shape existing on the development target surface other than the plate thickness surface in the plate thickness surface group, and f is the surface connected to the surface connected to the hole shape. 3. The method according to claim 1, wherein the surface corresponding to the condition (1) is recognized as a surface constituting the formed shape.

According to a third aspect of the present invention, in the forming shape classification step, the geometric shape matching of each surface constituting the forming shape is performed. 3. The method according to claim 1, wherein it is determined whether or not they are of the same type, and the formed shapes of the same type are grouped.

According to a fourth aspect of the present invention, in the attribute information adding step, there is a hole shape obtained by removing a molding shape existing on the surface of the development target surface shape from the temporarily stored attribute information. A storage attribute information adding step of adding a position as a reference, a sheet metal model developed shape generating step of expanding the sheet metal model to generate a sheet metal model expanded shape, and the attribute information added to the development target surface shape is a sheet metal model. 2. An attribute information inheriting step of inheriting an expanded shape.
4 is a method for recognizing a molded shape of a sheet metal model according to 2 or 3.

According to a fifth aspect of the present invention, the attribute information inheriting step refers to a learning shape processing step registered in a learning shape database. 5. The method according to claim 4, wherein the shape of the pilot hole is automatically added to the developed shape of the sheet metal model.

In the invention according to claim 6, the attribute information inheriting step refers to a learning shape processing step registered in a learning shape database, and if a hole is not necessary in a single step, the attribute information inheriting step is changed to a sheet metal model developed shape. The method according to claim 4 or 5, wherein the generated hole shape is deleted.

According to a seventh aspect of the present invention, a plurality of types of 3
A molded shape, which is the shape of a molded part existing in a sheet metal model, which is a three-dimensional model of a product, created by converting data relating to the three-dimensional CAD model and restoring it to a specific three-dimensional CAD, or created by the three-dimensional CAD Is a device for recognizing and adding attribute information. In order to perform a process for recognizing the molding shape existing in the sheet metal model, the sheet metal model is loaded into an area where a program performs processing on a plane basis. A basic attribute data adding unit for adding basic attribute data, which is data on a table side of a material, a thickness, and a development view, to the sheet metal model; A molded shape surface group that is a group of surfaces of each molded shape to be formed, a sheet thickness surface group that is a collection of sheet thickness surfaces, and a surface group that is a front surface of the sheet metal model and a back surface of the sheet metal model. A sheet metal shape recognizing means for recognizing a development target surface group consisting of surface groups, and the sheet thickness surface group, the development target surface group, and the molding shape surface group, which are joined by continuous surfaces to form a sheet thickness shape A surface joining means for generating a surface shape to be developed and a molded shape; a molded shape classifying means for classifying a plurality of types of molded shapes for each identical molded shape to form a group; Geometry, material,
And a molding shape identification unit that identifies the type of molding existing in the product from the sheet thickness, generates attribute information corresponding to the molding type, and temporarily stores the attribute information, and the temporarily stored attribute information. Attribute information adding means for adding to the elements relating to the sheet metal model so that NC data for processing the product can be created. The forming shape specifying means comprises: a learning shape registered in a learning shape database; With reference to the sheet thickness, in the same learning shape as the molding shape, if the material and the sheet thickness match, the mold center, the mold angle, and the mold angle corresponding to the registered learning shape, and Automatic attribute information storage means for reading and temporarily storing attribute information in the vertical direction of the molded shape, and when there is no learning shape that matches the above-described conditions, manually input the attribute information or learn the learning shape data. Be In a molded shape recognition device of the sheet metal model and a manual identification means for temporarily storing the attribute information is newly registered.

According to an eighth aspect of the present invention, there is provided a computer-readable storage medium storing a control program for controlling a molded shape identifying apparatus for a sheet metal model by a computer. In order to perform a process for recognizing the existing molded shape, a sheet metal model capturing program for capturing the sheet metal model in an area where the program performs processing on a plane basis, and a material and a sheet for the sheet metal model. A basic attribute data addition program for adding basic attribute data, which is data on the side of a thickness and a development view, and a formed shape surface group which is a set of surfaces of each formed shape existing in the sheet metal model; An exhibition consisting of a group of thick surfaces, which is a group of thick surfaces, a front surface group, which is the front surface of the sheet metal model, and a back surface group, which is the back surface of the sheet metal model. Sheet metal shape recognition program that recognizes the target surface groups, the thickness plane group, the expanded object plane group and,
The molded shape surface group is joined by continuous surfaces to form a sheet thickness shape, a development target surface shape, and a surface joining program for generating a molded shape, and a plurality of types of the same shape from among the molded shapes. Classified by each molded shape, a molded shape classification program to be grouped, and the geometric shape, material,
The molding shape identification program that identifies the type of molding present in the product from the sheet thickness and generates attribute information corresponding to the molding type and temporarily stores the attribute information, and the attribute information temporarily stored Storing an attribute information addition program to be added to the element relating to the sheet metal model so as to be able to create NC data for processing the product, wherein the molding shape identification program includes a learning shape registered in a learning shape database; With reference to the material and the plate thickness, in the same learning shape as the molded shape, if the material and the plate thickness match, the mold center, the mold angle corresponding to the registered learning shape, And an automatic attribute information storage program that reads and temporarily stores attribute information that is the vertical direction of the molded shape,
If there is no learning shape that matches the above conditions, a storage medium storing a manually specified program for manually inputting attribute information or newly registering in the learning shape database and temporarily storing the attribute information It is.

[0021]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a three-dimensional CAD / C according to the present embodiment.
1 shows a schematic configuration diagram of an AM system 1. FIG. 3D CAD /
The CAM system 1 is composed of a computer and includes, for example, a computer main body (not shown) and input / output devices such as a mouse and a keyboard.

Then, the three-dimensional CAD / CAM system 1
Is a display unit 3 for displaying a figure such as a three-dimensional model, and a three-dimensional CAD unit 5 for modeling a three-dimensional model of a product.
A three-dimensional CAD data file 7 for storing all of three-dimensional CAD data, which is three-dimensional model data modeled by the three-dimensional CAD 5, learning shape data used for recognizing a formed shape, and the like, and automatically forming a formed shape. Basic attribute input unit 11 for inputting information necessary for recognition
And a molded shape recognition management unit 13 that comprehensively manages the process of recognizing the molded shape portion of the three-dimensional model of the product.

The three-dimensional CAD unit 5 and the three-dimensional CAD
Dimensional CAD data file 7 and the basic attribute input unit 1
1 and the molded shape recognition management section 13 are connected by a link control section 9. As a result, the program becomes 3
Editing of three-dimensional CAD data can be performed while using the function of the three-dimensional CAD unit 5.

On the other hand, the three-dimensional CAD / CAM system 1 uses three-dimensional conversion data Hi (three-dimensional IGES data, ST) which is data for converting a three-dimensional model from a product supplier.
3D conversion data file 15 for storing EP data and the like, and 3D conversion data file 15
The dimension conversion data Hi is read, and the
A conversion unit 17 for converting the data into data for the dimensional CAD unit 5; As a result, 3
It becomes possible to receive the data of the dimensional model.

The molding shape recognition management section 13
3D CAD which is model data of the product to be processed
It has a function of reading data and storing it as sheet metal model data in a shape data file 19 which is a memory area that can be directly accessed by a program in order to perform a process of recognizing a molded shape portion of a three-dimensional model. Here, the sheet metal model data is stored in the shape data file 19 for each surface constituting the sheet metal model by the function of the three-dimensional CAD unit 5. Thereby, the molded shape recognition processing can be more appropriately performed.

The molding shape recognition management section 13 includes a sheet metal shape recognition section 21, a surface joining processing section 23, and a molding shape classification section 2.
5, a shape analyzing unit 27, a forming shape learning unit 29 that forms the shape analyzing unit 27, a forming type specifying unit 31, a manual specifying unit 33, a forming attribute adding unit 35, and a developing unit 37. ing.

The sheet metal shape recognizing section 21 reads all the planes constituting the sheet metal model from the shape data file 19 and recognizes a group of sheet thickness planes and a group of development target planes which are front / back sides of the sheet metal model. Classify. Then, the molding surface group, which is a protrusion existing on the front / back surface group, is recognized and classified. Then, these data are stored in the shape data file 19. The surface joining unit 23 is configured to store each surface existing in the sheet thickness surface group, the development target surface group, and the molding surface group classified by the sheet metal shape recognition unit 21 and stored in the shape data file 19. Each shape is generated by joining, and the data of this shape is stored in the shape data file 19.

The molded shape classifying unit 25 stores the sheet metal shape recognizing unit 21 stored in the shape data file 19.
, The formed shapes formed by joining the surfaces by the surface joining processing unit 23 are classified in the same shape unit, grouped and stored in the shape data file 19. The shape analysis unit 27 includes the molding shape learning unit 29 and the molding type specifying unit 31. And the molded shape learning unit 2
Reference numeral 9 has a function of newly registering a molding shape specific to each orderee in the learning shape database.

The forming type specifying section 31 matches a forming shape which is a key projection stored in the learning shape database with a recognized forming shape existing in the sheet metal model, and specifies a corresponding forming process. At the time of matching, the matching of the material and the plate thickness is of course also performed. Then, the attribute information, which is the information of the molding shape, material, plate thickness, mold name, and molding shape upward and downward, corresponding to the matched molding shape is temporarily stored.

When the molding shape to be processed is not registered in the learning shape database, the manual identifying unit 33 manually enters the molding shape name, material, plate thickness, mold name, molding shape upward. , Downward attribute information is input, and this attribute information is temporarily stored.

The processing attribute adding section 35 automatically adds the attribute information temporarily stored in the above-described processing to the development target surface shape. Then, the developing unit 37 performs a process of developing the sheet metal model and inheriting the attribute information added to the above-described development target surface shape into the developed shape.

Also, a three-dimensional CAD / CAM system 1
Is a data transmission unit 39 that reads the developed shape data generated by the above processing from the shape data file 19 and stores it in the developed view data file 41, and reads the developed view data from the developed view data file 41 and adds the developed view data to the developed shape. And an automatic die assignment processing unit 43 for assigning processing information such as die assignment to a development view based on the attribute information. With the above processing units, the CAM function of the three-dimensional CAD / CAM system 1 can create NC data. The created NC data is transmitted to, for example, the NC processing machine 47 via the communication cable 45, and Process the product.

Here, with reference to FIGS. 2 and 3, the types of molding shapes will be described. Here, the three-dimensional CA
Explanation will be made from the characteristic aspect of the molded shape on D.

The burring is performed as shown in FIG.
A curved surface BP1 that is continuous with a tangent plane is connected to the surface BAS2 of the sheet metal, a cylindrical surface BP2 that is connected to the curved surface BP1 all around, a plane BP3 that is connected to the other of the cylindrical surfaces all around, and a cylindrical surface that is connected to this plane BP3. It is a shape made of BP4.

As shown in FIG. 2B, the flathead screw is connected to the surface BAS3 of the sheet metal not in continuation of the tangent plane but in a curved surface SP1.
And a cylindrical surface SP2 connected to the curved surface all around. As shown in FIG. 2 (c), the stepped boss is connected to the surface BAS4 of the sheet metal not in continuous tangential plane but in a cylindrical surface DP1.
And a plane DP2 connected all around the cylindrical surface DP1 and a cylindrical surface DP3 connected all around the plane DP2.

The sheet metal shape recognizing section 21 recognizes a molding shape as a condition where the surface is connected to a curved surface other than the cylindrical surface all around, and a condition where a cylindrical surface which is not continuous with a tangent plane but is directly connected to a flat surface. Although there are cases where the surfaces are connected all over the circumference, the surfaces connected all over the surfaces connected over the entire circumferences are also recognized as the surfaces constituting the molded shape.

Further, as an application example of the present embodiment, the cut-and-raised shape has a shape in which a protrusion TM1 is connected to a sheet-shaped hole existing on the surface of a sheet-metal model as shown in FIG. As shown in FIG. 3 (b), the nutsert is connected to the surface BAS6 of the sheet metal not in a continuous tangent plane, and has a cylindrical surface IP1 different from the sheet thickness surface. In addition,
The above example is, of course, an example of the form of the molded shape.

A method of recognizing a molded shape will be described with reference to the flowcharts of FIGS. 4, 5, 6, 7, and 8. The drawings in which the data in the program of FIGS. 9 to 14 are made into a graphic are also referred to as necessary.

First, as shown in FIG.
In the reading process 1, for example, the conversion unit 17 converts the three-dimensional conversion data sent from the outsourcing, and restores the three-dimensional model of the sheet metal product to the three-dimensional CAD data file 7. In this example, the model is created by converting and restoring the three-dimensional conversion data. However, it is needless to say that a model modeled by the operation of the CAD unit 5 may be used. As a result, the sheet metal model SR is displayed on the display unit 3 as shown in FIG. In this example, the sheet metal model SR includes burring MBR1 and MBR2 on the sheet material MB.
And stepped bosses MBS1 and MBS2 and nutserts MNT1 and MNT2.
Then, the designer can perform necessary operations on the sheet metal model SR. On the other hand, the above-described three-dimensional conversion data indicates not only typical standards such as IGES and STEP but also general three-dimensional data formats.
Thereby, data can be received and taken in from various CADs. Then, the molded shape recognition management unit 13 reads the sheet metal model SR into the shape data file 19. In the case of this example, the sheet metal model SR is read as a surface unit. That is, this sheet metal model is read as a group of a plurality of surfaces. Thereby, the process of recognizing the formed shape from the sheet metal model SR can be easily performed later.

In the basic attribute input process in step S403, the information on the table thickness, material, and development table side of the sheet metal product is input from the basic attribute input unit 11 to the sheet metal model SR shown in FIG. On the other hand, input processing is performed. This makes it possible to recognize the thickness of the sheet and determine whether the molded shape is upward or downward when the sheet metal model SR is developed in a later process.

Next, in the sheet thickness surface group recognition processing in step S405, the sheet thickness plane group is recognized based on the sheet thickness value of the sheet metal model SR input in the processing in step S403.

In the forming surface group recognition process of step S407, a process of recognizing a surface of a projection connected to the surface of the sheet metal model SR as a forming surface group in addition to the plate thickness surface group is performed. As described above, in the case of this example, when reading the sheet metal model SR, the sheet metal model SR is read as a set of surfaces. As a method of recognizing a group of molding surfaces, there is a method of recognizing based on characteristics of a molding shape. That is, for example, a curved surface other than the cylindrical surface is recognized as a surface that forms the formed shape. A cylindrical surface connected to a plane, not a continuation of a tangent plane, is recognized as a surface constituting a molded shape. Then, a surface connected to the surface recognized by the above-described two methods on the entire circumference is recognized as a surface constituting the molded shape. According to this method, burring or the like generally becomes a model constituted by a cylindrical surface and a curved surface similar thereto, and thus can be recognized by the above-described method. Further, as a general condition, a surface connected to a hole shape existing in the sheet metal model SR other than the sheet thickness surface is recognized as a surface constituting the formed shape. Then, the surface connected to this surface is recognized as a surface constituting the molded shape. In this case, it is not possible to distinguish between the cut-and-raised by bending and the lance by shaping with the shape connected by one side to the hole shape. In this case, it is possible to cope by specifying manually. By the method described above, in this example, the sheet metal model SR
Burring shapes MBR1, MBR2, nutsert shapes MNT1, MNT2, and a stepped boss shape M
BS1 and MBS2 are recognized.

Then, in the development target surface recognition process in step S409, the plate thickness surface group and the forming surface group are removed from the entire surface group of the model to obtain parallel development target surfaces.

Next, in the molding surface joining process in step S411, a process of joining a group of molding surfaces to generate a plurality of molding shapes is performed. In the front surface group / back surface group bonding process in step S413, the front surface group and the back surface group that are to be developed are bonded. In the plate thickness surface group joining process in step S415, a process of joining the plate thickness surface groups is performed. In addition, in these joining processes, for example, there is a method of examining the coordinate values of the ridge line of each surface and joining them if they match.

As a result, inside the computer, burring shapes BR1 and BR2 and nutsert shapes NT1 and NT2 as shown in FIG.
And the stepped boss shapes BS1 and BS2 are recognized in the state of the paper model. Further, as shown in FIG. 10B, the development target surface shape composed of the front surfaces FS1, FS2 and the back surfaces RS1, RS2, RS3 is recognized in the state of the paper model. Further, as shown in FIG.
The sheet thickness shape composed of 1, TS2, TS3, and TS4 is recognized in the state of the paper model. Actually, due to computer processing, the quality varies depending on the sheet metal model,
Recognize with a certain width.

In the molding shape reading process in step S417, the molding shapes generated by joining are sequentially read and subjected to the program processing. Then, in the setting process in step S419, the geometric shape and the like of the target molded shape are checked, and for each group of the same molded shape, for example, a process of giving a group name for identification is performed. Note that the same determination of the molding shape in this processing is not limited to the geometric shape of the surface.For example, in the case of burring, the shape outside the tap may be drawn not by a surface but by a wire frame. Elements other than planes are also used as the basis for the same judgment.

In the grouping process of step S421, a process of performing grouping for each group name given in the process of step S419 is performed. This allows the program to define the molding shape for each group (for example, adding attribute information)
Batch processing becomes possible. Then, in the determination processing of step S423, it is determined whether or not the processing of steps S417 to S421 has been performed on all the formed shapes. In the determination process of step S423, all the molded shapes are processed in steps S417 to S4.
If it is determined that the processes up to 21 have been performed, the process proceeds to the determination process of step S425. If it is determined in step S423 that the processes from step S417 to step 421 have not been performed on all of the molded shapes, the process proceeds to step S417. It should be noted that those of the same type but of different sizes belong to different groups. For example, the burring of M3 and the burring of M5 are in different groups.

As a result, as shown in FIG. 11, a group A including the burring shapes MBR1 and MBR2, a group B including the nutsert shapes MNT1 and MNT2, and a group C including the stepped boss shapes MBS1 and MBS2 are generated. You.

In the determination process of step S425, it is determined whether or not any of the learning shapes registered in the learning shape database has the same shape as the formed shape grouped as described above. The determination of the identity is performed by matching the geometric shapes of the formed shape and the learning shape, and further, it is determined whether the material and the plate thickness are the same. Step S425
When it is determined in the process (1) that there is the same shape as the grouped shape in the learning shapes registered in the learning shape database, the process proceeds to the shape determination process in step S427. In the process of step S425, when it is determined that none of the learning shapes registered in the learning shape database is identical to the grouped formed shapes,
The processing is shifted to the manual molding shape specification processing of step S429.

In the forming shape specifying process in step S427, the forming shape is specified, and the material, thickness, mold name, and upward or downward of the forming shape corresponding to the same learning shape as this forming shape. The flag and the pointer of the memory in which the upward and downward molding shapes are registered are read and temporarily stored. In the manual forming shape specification process in step S429, the material, thickness, and the like are manually set for the forming shape not registered in the learning shape database.
For example, a process of inputting the mold name and the upward and downward flags of the molded shape from the display unit 3 and temporarily storing the input data is performed.

In the up / down determination process in step S431, a process is performed to determine whether the protrusion of the molded shape is upward or downward with reference to the front side of the development target surface shape. This makes it possible to add attribute information including the direction of the protrusion of the molded shape to the sheet metal model SR on the front side of the development target surface shape. In the attribute information adding process of step S433, a process of adding the attribute information temporarily stored by the above-described process to the position where the grouped molded shape exists on the surface of the development target shape is performed. By adding this attribute information, it becomes possible to allocate a die for processing a product.

In the determination processing of step S435, the processing of steps S425 to S43 is performed for all the groups.
It is determined whether the process of step 3 has been performed. Step S4
Step S4 is performed for all the groups in the determination processing of 35.
If it is determined from step 25 that the processing in step S433 has been performed, the process proceeds to step S437. If it is determined in step S435 that the processing from step S425 to step S433 has not been performed for all the groups, the process returns to step S425 to continue.

As a result, as shown in FIG. 12A, the center of the hole shapes BRH1 and BRH2 after removing the burring existing on the surface of the development target surface shape is, for example, XY.
The Z coordinate axes AR1 and AR2 are generated, and the attribute information is added to the XYZ coordinate axes AR1 and AR2.
Similarly, the hole shape after removing nutsert NTH
1. XYZ coordinate axes AR5 and AR6 are generated at the center of NTH2, and attribute information is added to the XYZ coordinate axes AR5 and AR6. Similarly, after removing the stepped bosses BS1 and BS2, the center of the hole shapes BSH1 and BSH2 is XY.
The Z coordinate axes AR3 and AR4 are generated, and attribute information is added to the XYZ coordinate axes AR3 and AR4. In addition,
In the case where the hole shape is an irregular shape, the center position is such that the center position registered in advance is a generation position of the XYZ coordinate axes.

In the development processing of step S437, the development target plane is developed. The development target surface may be either the front side or the back side of the development target shape, or may be an intermediate surface extracted from the sheet metal model SR and used as the development target surface.
This processing is already known, but will be briefly described.

First, in the thickness recognizing process in step S801, a process of calculating a thickness value is performed. Thereby, the center of the plate thickness can be obtained. Step S803
In the intermediate plane generation processing, as shown in FIG. 12B, an intermediate plane CTP is generated and extracted at the center of the sheet thickness plane of the sheet metal model SR. As a result, as shown in FIG. 13A, an intermediate plane CTP including the planes STP1 and STP3 and the curved plane STP2 is generated. At this time, the generated intermediate plane CTP
The following processing steps are performed based on the generated intermediate plane CTP since the number of faces is significantly reduced by removing the thickness component compared to the case where the sheet metal model SR is directly handled. Are sequentially executed, the number of processing steps in each processing step can be significantly reduced.

Although the intermediate plane CTP is formed at the center of the plate thickness, it is needless to say that the intermediate plane CTP may be formed at an arbitrary position.
In the bending surface recognition processing in step S805, the intermediate plane CTP
Among them, a process for recognizing the surface STP2 to be bent is performed. In the elongation value acquisition processing in step S807, at least the bending angle and inner R
The elongation value of each bending surface is acquired with reference to the radius dimension of (bending R) and the constraint conditions including the material of the sheet metal work. The elongation value of the bending surface obtained in the elongation value obtaining process may be set and input by an operator, for example.

Next, in the inter-plane connection state search processing in step S809, the planes STP1, STP constituting the intermediate plane CTP are set.
The connection state between the TP3 and the curved surface STP2 is searched, and an inter-plane connection relation table containing the connection state between the surfaces is created based on the search result. Step S811
In the determination processing of (1), it is determined whether or not the development processing has been performed on all the planes constituting the intermediate plane CTP. Step S8
If it is determined in step 11 that the development processing has been performed on all the planes, the processing is shifted to the inter-plane line segment removal processing in step S817. If it is determined in the determination processing in step S811 that the expansion processing has not been performed on all the surfaces, the processing proceeds to the expansion calculation processing in step S813.

In the expansion calculation process in step S813, a plurality of surfaces constituting the intermediate plane CTP (the plane ST in this example)
P1, STP2, and curved surface STP3) are processed to calculate the shape of the partially developed surface when the surface is developed. Further, in the development plane generation processing in step S815, the partial development plane is sequentially generated based on the inter-plane connection relation table created in the inter-plane connection state search processing in step S809. As a result, FIG.
The plane STP1 is generated as shown in FIG.
As shown in (c), a partial development surface STP1 and a partial development surface STP2 connected to the partial development surface STP1 are generated. Further, as shown in FIG. 13D, a partial development surface STP1, a partial development surface STP2 connected to the partial development surface STP1, and a partial development surface STP3 connected to the partial development surface STP2 are generated.

In the inter-plane line segment removal processing in step S817, by removing the line segments existing between the partial development planes, an entire development view in which the outer periphery forms one closed path is generated, and the processing ends.

The description returns to the attribute information inheritance process of step S439 in FIG. In this process, a process is performed in which the attribute information added to the surface of the development target shape described above is inherited by a corresponding position of the development shape developed as described above. At this time, for example, when there is a molding process in multiple steps and a predetermined pilot hole is required, this is added to the developed shape. This makes it possible to add appropriate attribute information to a molded shape that requires processing in multiple steps. If a hole shape is unnecessary in a single step, the corresponding hole shape existing in the developed shape is deleted. As a result, as shown in FIG. 14, the upward burring molding shapes SBL1, SBL2
And upward nutsert molding shapes SBL3, SBL4
Then, a developed shape to which the attribute information of the downward stepped boss molding shape is added is generated. A symbol is displayed on the added molded shape for easy identification.

Finally, in the NC data creation process of step S441, the developed shape from which the attribute information has been inherited is transmitted to the CAM unit (not shown). Then, a die is allocated, NC data (for example, a G code) is generated and transmitted to the NC machine tool. Thereby, a predetermined product can be properly processed.

It should be noted that the present invention is not limited to the above-described embodiment, but may be modified by appropriate modifications.
It goes without saying that the present invention can be implemented in other modes.

FIG. 15 shows a CD-ROM as an example of a storage medium storing a control program for controlling the above-described apparatus for recognizing a molded shape of a sheet metal model.
The CD-ROM is a computer-readable storage medium that stores a control program for controlling a device for recognizing a molded shape of a sheet metal model by a computer, and is a process for recognizing the molded shape present in the sheet metal model. In order to perform this, the sheet metal model in a unit of surface, a sheet metal model capturing program that captures in an area where the program performs processing, and a material,
A sheet thickness, and a basic attribute data addition program for adding basic attribute data that is data on a table side of a developed view, and a formed shape surface group that is a collection of surfaces of each formed shape existing in the sheet metal model, A sheet metal shape recognition program for recognizing a sheet thickness surface group that is a collection of sheet thickness surfaces, and a development target surface group consisting of a front surface group that is a front surface of the sheet metal model and a back surface group that is a back surface of the sheet metal model, The sheet thickness surface group, the development target surface group, and the formed shape surface group, the continuous surfaces are joined together, the plate thickness shape, the development target surface shape, and a surface joining program that generates a formed shape, A molding shape classification program for classifying and grouping the same shape from among a plurality of types of molding shapes for each identical shape, and a type of molding existing in the product based on the geometric shape, material, and plate thickness of the molding shape Identify this molding The present invention relates to a sheet metal model so that a molding shape specifying program for generating and temporarily storing attribute information corresponding to a class and NC data for processing the temporarily stored attribute information for a product can be created. An attribute information addition program to be added to the element is stored, and the molding shape specifying program refers to the learning shape, the material, and the plate thickness registered in the learning shape database, and performs the same learning as the molding shape. When the shape, the material, and the thickness match, the attribute information such as the mold center, mold angle, and vertical direction of the molded shape corresponding to the registered learning shape is read and temporarily stored. If there is no learning shape that matches the automatic attribute information storage program to be executed under the above conditions, enter the attribute information manually or register it in the learning shape database to temporarily register the attribute. In which are stored the manual specific program for storing distribution.

[0064]

As described above, according to the present invention, for example, since a molding specific process is performed from a molded shape, the design side does not obstruct the three-dimensional advantages (for example, interference check of the molded shape) without causing a model failure. There is an effect that can be created.
In addition, since the process is a molding specific process based on a molded shape, the CAM side does not need to rely on a plurality of types of partner setting CAD, and has an effect that a single CAM system can be used.

By holding the learning shape part of the forming database for each ordering source, there is an effect that it is possible to deal with the forming shapes of a plurality of ordering sources holding different three-dimensional design CADs.

Further, since the learning function is used as a base, there is an effect that a troublesome arrangement between the design side and the production side becomes unnecessary. Since the addition of the processing information and the like is an automatic process accompanying the automatic development process from the three-dimensional sheet metal model,
There is an effect that a great time saving effect can be obtained as compared with the two-dimensional case. In addition, since it is an automatic process and does not require manual intervention, there is no effect of causing a careless mistake, and there is an effect that so-called development view verification time is not required.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a schematic configuration of a method and an apparatus for recognizing a molded shape of a sheet metal model in a three-dimensional CAD / CAM system.

FIG. 2 is an explanatory diagram illustrating types of molded shapes.

FIG. 3 is an explanatory diagram illustrating types of molded shapes.

FIG. 4 is a flowchart illustrating the flow of a molded shape automatic recognition process.

FIG. 5 is a flowchart continued from FIG. 4;

FIG. 6 is a continuation of the flowchart of FIG. 5;

FIG. 7 is a continuation of the flowchart of FIG. 6;

FIG. 8 is a flowchart illustrating a flow of a sheet metal model expanding process.

FIG. 9 is an explanatory diagram illustrating a sheet metal model.

FIG. 10 is an explanatory diagram illustrating a group of surfaces of a classified sheet metal model.

FIG. 11 is an explanatory diagram illustrating grouping of a molded shape.

FIG. 12 is an explanatory diagram illustrating added attribute information and an intermediate plane.

FIG. 13 is an explanatory diagram illustrating development of a sheet metal model.

FIG. 14 is an explanatory diagram illustrating inheritance of attribute information.

FIG. 15 is an explanatory diagram of a storage medium.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 3D CAD / CAM system 3 Display unit 5 3D CAD unit 7 3D CAD data file 9 Link control unit 11 Basic attribute input unit 13 Molded shape recognition management unit 15 3D conversion data file 17 Conversion unit 19 Shape data file 21 sheet metal shape recognition unit 23 surface joining processing unit 25 molding shape classification unit 27 shape analysis unit 29 molding shape learning unit 31 molding type specification unit 33 manual specification unit 35 molding attribute addition unit 37 development unit 39 data transmission unit 41 development view data File 43 Automatic die assignment processing unit 45 Communication cable 47 NC machine

Claims (8)

(57) [Claims] 1. A method of converting data relating to a plurality of types of three-dimensional CAD models and restoring the data to a specific three-dimensional CAD, or
A method of recognizing a molded shape, which is a shape of a molded part existing in a sheet metal model, which is a three-dimensional model of a product, created by three-dimensional CAD and adding attribute information, wherein the attribute information is included in the sheet metal model. In order to perform a process for recognizing a molding shape, a sheet metal model capturing step of capturing the sheet metal model in an area where a program performs processing on a surface basis, and for the sheet metal model, a material, a sheet thickness, and A basic attribute data adding step of adding basic attribute data which is data on a side to be a table of a development view, a formed shape surface group which is a group of surfaces of each formed shape existing in the sheet metal model, A sheet metal shape recognizing step of recognizing a group of sheet thickness faces as a group, and a development target face group including a front face group as a front face of the sheet metal model and a back face group as a back face of the sheet metal model; group The development target surface group and the molding shape surface group are joined by continuous surfaces to form a plate thickness shape, a development target surface shape, and a surface joining step of generating a molding shape, and a plurality of types of the From among the formed shapes, each formed shape is classified into the same shape, and a formed shape classifying step for grouping, and the shape of the formed shape, the material, and the type of forming present in the product from the plate thickness are specified. A molding shape specifying step of generating and temporarily storing attribute information corresponding to the molding type; and forming the NC information for processing a product by using the temporarily stored attribute information. An attribute information adding step of adding to an element relating to a sheet metal model, wherein the forming shape specifying step includes a learning shape registered in a learning shape database, a material, and a sheet thickness, and the forming shape With the same learning shape If the material and the thickness match, the attribute information such as the mold center, mold angle, and vertical direction of the molded shape corresponding to the registered learning shape is read and temporarily stored. The attribute information storing step and the manual specifying step of inputting the attribute information manually or newly registering the attribute in the learning shape database and temporarily storing the attribute information when there is no learning shape that matches under the above-described conditions. A method for recognizing a molded shape of a sheet metal model, comprising: 2. In the sheet metal shape recognizing step, when a surface forming a molded shape is a: a curved surface other than a cylindrical surface,
b: In the case of a cylindrical surface that is not continuous with a tangent plane and is directly connected to a plane, c: In the case that the surface is connected to a curved surface other than the cylindrical surface on the entire circumference, and d: A cylindrical surface that is not connected with the tangent plane and is directly connected to a flat surface E: a surface connected to the hole shape existing in the development target surface shape other than the plate thickness surface in the group of plate thickness surfaces, f: a surface connected to the hole shape 2. The method according to claim 1, wherein a surface corresponding to any one of a to f is recognized as a surface constituting the formed shape. 3. The molding shape classification step includes the steps of: matching the geometric shape of each surface forming the molding shape; and, when the molding shape includes an element other than the geometric shape, matching the elements with each other. 3. The method of recognizing a molded shape of a sheet metal model according to claim 1, wherein it is determined whether or not the type is a type, and the molded shapes of the same type are grouped. 4. The attribute information adding step adds the attribute information temporarily stored based on a position where a hole shape is present after removing a molded shape existing on the surface of the development target surface shape. A storage attribute information adding step, a sheet metal model developed shape generating step of expanding the sheet metal model to generate a sheet metal model expanded shape, and an attribute for inheriting the attribute information added to the expansion target surface shape to the sheet metal model expanded shape 4. The method for recognizing a molded shape of a sheet metal model according to claim 1, further comprising an information inheriting step. 5. The attribute information inheriting step refers to a learning shape processing step registered in a learning shape database,
5. The method of recognizing a molded shape of a sheet metal model according to claim 4, wherein if a prepared hole or the like is required in the forming process in multiple steps, the shape of the prepared hole is automatically added to the developed shape of the sheet metal model. 6. The attribute information inheriting step refers to a learning shape processing step registered in a learning shape database,
The method according to claim 4 or 5, wherein when a hole is unnecessary in a single step, the hole shape generated in the developed shape of the sheet metal model is deleted. 7. A method of converting data relating to a plurality of types of three-dimensional CAD models and restoring the data to a specific three-dimensional CAD, or
An apparatus for adding attribute information by recognizing a molded shape that is a shape of a molded part existing in a sheet metal model that is a three-dimensional model of a product created by three-dimensional CAD, and adding the attribute information. In order to perform a process for recognizing a molded shape, a sheet metal model capturing unit that captures the sheet metal model in an area where a program performs processing on a surface basis, and for the sheet metal model, a material, a sheet thickness, and Basic attribute data adding means for adding basic attribute data which is data on the side to be a table of a development view; a formed shape surface group which is a group of surfaces of each formed shape existing in the sheet metal model; A sheet metal shape recognizing means for recognizing a group of sheet thickness surfaces as a group, and a development target surface group including a surface group as a front surface of the sheet metal model and a back surface group as a back surface of the sheet metal model; group , The development target surface group, and the molded shape surface group, by joining continuous surfaces together, a plate thickness shape, a development target surface shape, and a surface joining means for generating a molded shape, and a plurality of types of the From among the formed shapes, the same shape is classified for each formed shape, and the formed shape classifying means to be grouped, and the type of the formed shape present in the product from the geometric shape, the material, and the thickness of the formed shape, A molding shape specifying means for generating and temporarily storing attribute information corresponding to the molding type; and forming the NC information for processing the product by using the temporarily stored attribute information. Attribute information adding means to be added to the element related to the sheet metal model, wherein the forming shape specifying means, the learning shape registered in the learning shape database, the material, the thickness, with reference to the formed shape With the same learning shape If the material and the thickness match, the attribute information such as the mold center, mold angle, and vertical direction of the molded shape corresponding to the registered learning shape is read and temporarily stored. Attribute information storage means and manual identification means for manually inputting attribute information or newly registering in the learning shape database and temporarily storing attribute information when there is no learning shape that matches under the above conditions. An apparatus for recognizing a molded shape of a sheet metal model, comprising: 8. A computer-readable storage medium storing a control program for controlling a molding shape identification device by a computer, wherein the control program is for recognizing the molding shape present in the sheet metal model. In order to perform the above processing, a sheet metal model capturing program that captures the sheet metal model in a region where the program performs processing on a plane basis, and a table of materials, sheet thicknesses, and developed views for the sheet metal model. A basic attribute data addition program for adding basic attribute data as side data, a formed shape surface group which is a group of surfaces of each formed shape existing in the sheet metal model, and a plate thickness surface which is a set of plate thickness surfaces Sheet metal shape recognition for recognizing a group and a development target surface group consisting of a front surface group which is a front surface of the sheet metal model and a back surface group which is a back surface of the sheet metal model. A program, a surface joining in which a sheet thickness shape, a development target surface shape, and a molding shape are generated by joining the sheet thickness surface group, the development target surface group, and the molding surface group with continuous surfaces. A program, a molding shape classification program for classifying and grouping the same shape from a plurality of types of the molding shapes for each of the same molding shapes, and presenting in the product from the geometric shape, material, and plate thickness of the molding shape. A molding shape specifying program for specifying a type of molding, generating attribute information corresponding to the molding type and temporarily storing the information, and converting the temporarily stored attribute information into NC data for processing a product. An attribute information addition program to be added to the element relating to the sheet metal model so as to be able to be created; and the molding shape specifying program stores a learning shape registered in a learning shape database. With reference to the material and the plate thickness, in the same learning shape as the molding shape, if the material and the plate thickness match, the mold center and the mold angle corresponding to the registered learning shape , And an automatic attribute information storage program that reads and temporarily stores the attribute information in the vertical direction of the molded shape, and manually inputs the attribute information or learns if there is no learning shape that matches the above-described conditions. A computer-readable storage medium storing a program for a method for recognizing a molded shape of a sheet metal model, wherein a manually specified program for newly storing the attribute information and temporarily storing the attribute information is stored in a shape database.