JPH06266806A - Cad/cam device and its solid model correcting method - Google Patents

Abstract

PURPOSE:To improve the operation efficiency of a bent part at the time of generating a developing shape and to enable an operator to easily and highly precisely prepare the developing shape. CONSTITUTION:This CAD/CAM device is provided with a sheet model defining part 4 for defining a plate-like product shape by a sheet model having no thickness, a sheet model editing part 6 for editing the sheet model by specifying a notched shape, a solid model converting part 7 for generating a solid model by thickening the sheet model, a solid model defining part 9 for defining a solid model with thickness, a solid model editing part 10 for editing the solid model by operation, an interference checking part 11 for retrieving the interference of a model, and a development shape generating part 12a for developing the solid model to generate a developing shape model.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CAD / CAM device and a solid model correction method therefor, and more particularly to a CAD / CAM device and a solid model which can generate and edit a shape model through a sheet model and a solid model. It relates to a model correction method.

[0002]

2. Description of the Related Art FIG. 20 is a block diagram showing a schematic configuration of a shape model generating / editing apparatus in a conventional CAD / CAM apparatus. In the figure, 1 is a numerical input device such as a keyboard, 2 and 3 are pointing devices such as a mouse and a tablet for inputting coordinates, and 4 is a numerical input device 1.
A sheet model information memory for storing the sheet model data generated by the sheet model definition unit 4 for defining a product shape as a sheet model without thickness from the numerical coordinate values input by the pointing devices 2, 3. , 6 is a sheet model editing unit for correcting the sheet model stored in the sheet model information memory 5, and 7 is a solid model conversion for defining a thickness in the sheet model stored in the sheet model information memory 5 and converting it into a solid model. Reference numeral 8 denotes a solid model information memory for storing the solid model data converted by the solid model conversion unit 7, 11 is an interference check unit for checking the interference of the solid model data stored in the solid model information memory 8, and 12 is Sled stored in the solid model information memory 8 It is a developed shape generation unit that generates a developed shape from de model data. A display device (CRT) 13 displays a sheet model and a solid model.

Here, the solid model is a model in which information of a surface model [a wire frame model (a model that uses only the contour data of an object when representing an object on a computer) has data of "plane"). ] In addition to the data of [], it is the model which has the data of "contents".

The sheet model here is similar to the above-mentioned surface model, but the surface model represents all the surfaces of the object, whereas the sheet model represents only a part of the surface of the object. Since the sheet metal is assumed to be a plate having a constant thickness, it is possible to represent an object by a sheet model, but a sheet model cannot exist in other than sheet metal, for example, a die.

Next, the notch will be described. When a thick plate is bent, the bending ends are distorted. This distortion increases the size of the product. Further, if the strain increases, cracks may occur. In order to prevent such a situation, when cutting out the plate, a hole or the like is made in advance at a place where a crack occurs. Making a shape such as a hole at the end of bending is called a notch, and that shape is called a notch shape.

[0006] Further, the expansion means that the sheet metal product is extended into a flat plate shape. Sheet metal products are obtained by processing one or more flat plates. Here, processing is cutting,
Bending, welding, etc. In order to create a desired sheet metal product, it is necessary to reverse the operation of bending and develop what plate shape to create. When CAD is not used, a developed shape is created by consideration on a desk.

Next, the operation will be described. FIG. 21 shows
FIG. 22 is a flowchart showing a flow of operations in the conventional CAD / CAM device, and FIGS. 22 and 23 are specific explanatory diagrams corresponding to the operations shown in FIG. The shape information input by the numerical value input device 1 and the pointing devices 2, 3 defines the sheet model of the product shape by the sheet model definition unit 4 (S91 / FIG. 22 (a)), and stores the data in the sheet model information memory 5 To store. The bending R shape is set by the sheet model editing unit 6 for the sheet model stored in the sheet model information memory 5 (S92 / FIG. 22).
(B)), Butt shape setting (S93) is executed.

Next, the expanded model is expanded by the expanded shape generator 12 to create an expanded view (S94 / FIG. 22).
(C)). Enter the plate thickness for the developed shape (S95),
The notch shape corresponding to the plate thickness is set by the sheet model editing unit 6 (S96), the extension amount of the bent portion is calculated, and the development view is corrected (S97 / FIG. 22 (d)). In order to confirm the product shape model when the correction of the development view is completed, the solid model conversion unit 7 converts the sheet model stored in the sheet model information memory 5 into a solid model (S98 / FIG. 22 (e)). It is stored in the solid model information memory 8.

Next, the expanded shape generator 12 executes a solid model interference check process. That is, it is determined whether or not an interference portion has occurred (S99), and if there is interference, the above steps S91 to S98.
Repeat the operation of. On the contrary, if there is no interference, then it is judged whether or not the shape correction is necessary (S10).
0), if it is determined to be unnecessary, the series of operations is ended.
On the contrary, when it is determined that the shape correction is necessary, that is, when the operator confirms the solid model on the display device 13 and there is a design change or an input error, the above step S9 is performed.
The subsequent operation is repeated from the sheet model definition of No. 1 (Fig. 2
3 (f)-(j)).

In addition, "Three-view drawing system for sheet metal parts" disclosed in Japanese Patent Application Laid-Open No. 1-106176, which is a reference technical document related to the present invention, and Japanese Patent Application Laid-Open No. 2-41573.
"Solid CAD system" disclosed in Japanese Patent Publication No.
Japanese Patent Laid-Open No. Sho 63-130220 discloses a "sheet metal development drawing data creation device", Japanese Patent Laid-Open No. Sho 64-88778.
Japanese Patent Laid-Open Publication No. 4-213168, "Self-interference three-dimensional correction device" disclosed in Japanese Patent Laid-Open No. 4-213168, and "Japanese Patent Laid-Open No. 4-114283". 3D solid model creation method "is available.

[0011]

Conventional CAD /
Since the CAM device is configured as described above, it has the following problems. That is, firstly, when the solid-converted model is to be modified by design change or the like, it is necessary to start over from the sheet model definition, and there is a problem that the operation until the product development shape creation is troublesome. Second
In addition, there is a minimum limit value for the R of the bent portion due to the thick plate material, and when a development value is calculated by setting a value smaller than this value, there is a problem that a dimensional error occurs during actual processing. . Thirdly, the notch shape setting for crack prevention is calculated and set only from the sheet thickness information, so the characteristics of the sheet material cannot be taken into consideration, and the notch shape with an unnecessarily large size is set to improve the appearance of the product shape. There was a problem of loss. Fourth,
Since the solid model does not take into account the deformation due to bending such as the hole shape, the deformation was discovered for the first time during actual machining, and the design change had to be made again at that time, resulting in the problem of poor work efficiency. Fifth, it is difficult to confirm the product shape because the butt shape is set for a sheet model with no thickness, and the shape may be confirmed after solid conversion and a setting error may be found. However, there is a problem that the amount of operation increases. Sixth, there is a problem in that the interference check is a processing method performed at one time, the processing takes time, and the model correction must be performed at one time, resulting in poor work efficiency. Seventh, since the amount of elongation at the time of developing the bending portion was calculated only from the plate thickness and the bending angle,
There is a problem that the accuracy of the developed shape model is poor because the characteristics of bending and the characteristics of the plate material cannot be taken into consideration.

The present invention has been made to solve the above problems, and enables definition and editing of a product shape model for a solid model having an easy product shape, and a minimum bending. It is possible to set the calculation of R, it is possible to predict cracks and shape deformation due to bending, and it is possible to correct the size of the interference occurrence point.
Further, the CAD / CAM device and its solid model capable of increasing the calculation accuracy of the stretch margin of the bent portion when the expanded shape is generated and allowing the operator to easily (improve the working efficiency) and to create the expanded shape with high accuracy. The aim is to get a fix.

[0013]

CAD / according to the present invention
The CAM device includes a sheet model defining means for defining a plate-like product shape by a sheet model having no thickness, a sheet model editing means for editing a sheet model by designating a bending shape and a notch shape, and a solid model for thickening a sheet model. Solid model generation means for generating a model, solid model definition means for defining a thick solid model, solid model editing means for editing a solid model by calculation, interference search means for searching for model interference, and solid model And a developed shape generating means for developing a developed shape model.

Further, a sheet model defining means for defining a plate-like product shape by a sheet model having no thickness, a sheet model editing means for editing a sheet model by designating a bending shape and a notch shape, and a thickness are added to the sheet model. Solid model generating means for generating a solid model, solid model defining means for defining a thick solid model, solid model editing means for editing the solid model by calculation, interference searching means for searching for model interference, and solid In a CAD / CAM device equipped with a developed shape generation means for developing a model and generating a developed shape model, a bend shape generation / editing means for generating and editing a bend shape by designating a bend R for a model bend portion, Minimum bending R calculating means for calculating the minimum bending R by inputting the plate material / thickness, and specifying the bending R A bent portion retrieval means for retrieving the free bending part which includes a side retrieval means for retrieving two corresponding sides of one bending portion in the solid model.

Further, a sheet model defining means for defining a plate-like product shape by a sheet model having no thickness, a sheet model editing means for editing a sheet model by designating a bending or notch shape, and a thickness for the sheet model are provided. Solid model generating means for generating a solid model, solid model defining means for defining a thick solid model, solid model editing means for editing the solid model by calculation, interference searching means for searching for model interference, and solid In a CAD / CAM device equipped with a developed shape generating means for developing a model and generating a developed shape model, a butt portion searching means for searching a butt portion causing a crack by designating a plate material / thickness, and a notch It also has notch shape setting and editing means for setting the shape and editing the model. It is.

Further, a sheet model defining means for defining a plate-like product shape by a sheet model having no thickness, a sheet model editing means for editing a sheet model by designating a bending or notch shape, and a thickness for a sheet model are provided. Solid model generating means for generating a solid model, solid model defining means for defining a thick solid model, solid model editing means for editing the solid model by calculation, interference searching means for searching for model interference, and solid A CAD / CAM device equipped with a developed shape generating means for developing a model and generating a developed shape model, comprising search warning means for searching for a shape of a hole or the like that is deformed by bending according to the bending R setting and issuing a warning. Is.

Further, a sheet model defining means for defining a plate-like product shape by a sheet model having no thickness, a sheet model editing means for editing a sheet model by designating a bending shape and a notch shape, and a thickness for the sheet model are added. Solid model generating means for generating a solid model, solid model defining means for defining a thick solid model, solid model editing means for editing the solid model by calculation, interference searching means for searching for model interference, and solid In a CAD / CAM apparatus equipped with a developed shape generation means for developing a model and generating a developed shape model, an edit location interference check means for checking the edit location interference of an edited solid model and an interference of a butt section are checked. Interference check means for butt section to be checked and the dimension at the time of interference It is intended to and a dimension correction means for correcting a.

Further, a sheet model defining means for defining a plate-like product shape by a sheet model having no thickness, a sheet model editing means for editing a sheet model by designating a bending or notch shape, and a thickness for the sheet model are provided. Solid model generating means for generating a solid model, solid model defining means for defining a thick solid model, solid model editing means for editing the solid model by calculation, interference searching means for searching for model interference, and solid In a CAD / CAM device equipped with a developed shape generation means for developing a model and generating a developed shape model, the bending portion is expanded when the solid model is developed by designating a bending method and inputting a plate material, a plate thickness, and a bending angle. It is provided with a calculation correction means for calculating the amount and correcting the developed shape.

Further, the solid model correction method of the CAD / CAM apparatus according to the present invention relates to the change of the data stored in the solid model information storage means, and when the data needs to be changed, the solid model definition means is used. Define a new solid model, then if there is an interference in the defined solid model,
It is determined whether or not the solid model needs to be corrected, and if it is determined that the solid model needs to be corrected, the solid model is corrected.

[0020]

According to the present invention, a solid model converted from a sheet model or a newly generated solid model is subjected to sum / difference / product operations (Boolean operation), bending R,
Edit the solid model by setting the butt shape. In addition, the minimum bend R is calculated based on the plate material and the plate thickness, and the minimum bend R is set for the retrieved bend portion for which the bend R is not designated. Further, for the bent portion of the solid model, the bend R is set for the designated bent portion and the searched bent portion on the opposite side.

Further, a specified notch shape is set at the searched crack occurrence location. In addition, the deformed shape due to the retrieved bending is warned on the display device. Further, an interference check is performed on the butt portion having the butt shape set, and the butt portion is corrected to a size that does not cause interference. In addition, a collision check is performed on the solid model edited portion, and the interference portion is warned on the display device. In addition, the bending method input, the plate material of the bending part,
Based on the plate thickness and bending angle information, the expansion amount is calculated and the expanded shape is corrected.

[0022]

[Embodiment 1] Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of a CAD / CAM device. In FIG. 1, 1 is a numerical value input device, 2 and 3 are pointing devices for inputting coordinates, 4 is a numerical value input device 1 and pointing device 2,
A sheet model definition unit that defines a sheet model having no thickness based on the numerical coordinate values input by 3 is a sheet model information memory that stores the sheet model data generated by the sheet model definition unit 4, and 6 is a sheet. It is a sheet model editing unit that corrects the sheet model stored in the model information memory 5.

Further, 7 is a solid model conversion unit for defining thickness in the sheet model stored in the sheet model information memory 5 and converting it into a solid model, and 8 is stored solid model data converted by the solid model conversion unit 7. The solid model information memory 9 is a solid model definition unit for defining a solid model from the numerical coordinate values input by the numerical input device 1 and the pointing devices 2, 3.
Reference numeral 10 is a solid model editing unit for correcting the solid model stored in the solid model information memory 8, 11 is an interference checking unit for checking the interference of the solid model data corrected by the solid model editing unit 10, 12
Reference numeral a denotes a developed shape generation unit that generates a developed shape from the solid model data stored in the solid model information memory 8. A display device (CRT) 13 displays the sheet model data stored in the sheet model information memory 5 and the solid model data stored in the solid model information memory 8.

Next, the operation will be described. 2 (a)-
(H) shows the target product shape and the shape model displayed by the display device 13, and FIG. 3 is a flowchart showing the flow of operations from the definition of the shape model to the creation of the expanded shape.

First, the plate number registered in advance by the numerical value input device 1 and the plate thickness, for example, 1.0 mm
If so, enter 1.0 (S1). Next, a sheet model is defined based on coordinate values input by the pointing devices 2 and 3, for example, reference coordinate values and numerical values input by the numerical value input device 1, for example, size of shape (S2). In step S2, the sheet model definition unit 4 creates a sheet model based on the input data, and the created sheet model data is stored in the sheet model information memory 5 and displayed on the display device 13. For example,
The inner shape 21 (FIG. 2) of the product shape 20 (FIG. 2 (a))
(B)) is displayed.

Further, the sides of the sheet model displayed on the display device 13 are designated by the pointing devices 2 and 3, and necessary data, for example, 5.0 for bending R5.0 mm is input by the numerical input device 1 ( S3). In addition, notch shape setting (S4) and butt shape setting (S5) are executed. This input data is added to the sheet model data stored in the sheet model information memory 5 in the sheet model editing unit 6, and is displayed on the display device 13 as, for example, a feature 22 (FIG. 2C). . It is determined whether or not the sheet model in which the bending R, the notch shape, and the butt shape are respectively set (S3 to S5) needs further correction or change (S6),
When it is determined that it is necessary, the above steps S3 to S5
repeat. On the contrary, when it is determined that the sheet model does not need to be corrected or changed, the solid model conversion unit 7 inputs the sheet model data stored in the sheet model information memory 5 to the plate input in step S1. Extend the thickness and convert to a solid model (S
7).

Here, the solid model is a model that has a thickness and can represent all of the outer and inner shapes, whereas the sheet model represents only the outer or inner shape of the product. The converted solid model is stored in the solid model information memory 8 and is displayed by the display device 13, for example,
It is displayed as a feature 23 (FIG. 2D).

Next, shifting to the flow chart shown in FIG. 4, first, it is judged whether or not a new plate needs to be added or deleted for the change of the data stored in the solid model information memory 8 (S8). ). As a result, when it is determined that a new solid model definition is necessary, the solid model definition unit 9 defines a new solid model (S9). In the solid model definition, there are a method of defining a contour shape and creating a rectangular parallelepiped based on a plate thickness that is input in advance, and a method of creating a dimensional value by inputting a dimension value into the shape prepared first.

Next, the solid model editing unit 10 performs sum / difference / product operations (Boolean (logical)) with the existing solid model.
The calculation, hereinafter the same) is performed and registered in the solid model information memory 8. Here, the sum, difference, and product operations are each 2
To get the intersection of all two models, one model to another. For example, when a hook portion of the lid is added to the shape body 23 to make a hole, first, the shape 24 of the hook portion (see FIG.
(E)), the shape 25 of the hole (FIG. 2 (f)) is defined by the solid model definition unit 9, and the solid model 26 (FIG. 2 (g)) is calculated by the sum calculation and difference calculation (correction) with the feature 23. Create (S10).

Next, the interference check unit 11 searches the solid model 26 calculated in step S10 above to determine whether or not an interference part occurs (S11). The interference check by the interference check unit 11 is performed in step S above.
Only when the sum operation is performed in 10, only the part where the sum operation is performed is executed. If it is determined in step S11 that the interference portion has occurred, then it is determined whether the solid model needs to be corrected (S1).
2) If it is determined that the solid model needs to be corrected, the solid model is corrected (S13).

Thereafter, it is judged whether or not the interference portion exists (S14). As a result, if it is judged that the interference portion exists, then it is judged whether or not the correction of the solid model is completed. (S15) If it is determined that the correction of the solid model is completed, then it is determined whether the new solid model definition is completed (S16). Therefore, if it is determined that the new solid model definition is completed,
The expanded shape generator 12a expands the solid model in the solid model information memory 8 (S17), and ends the series of operations.

[Embodiment 2] Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 5 is a flow chart showing the flow of the operation for setting the bending R for the sheet model, and FIG. 6 shows the shape model displayed on the display device 13 when setting the bending R for the sheet model. 7
Display device 1 when setting bend R in the solid model.
3 shows the shape model displayed in FIG. 3, and FIG. 8 shows a flowchart showing the flow of the operation for setting the bend R for the solid model.

First, an embodiment of the bending R setting for the seat model will be described. First, step S3 shown in FIG.
When the setting of the bending R is started, the minimum radius R of the minimum bending R of the plate bending range is calculated based on the input plate material and plate thickness data. If necessary, the minimum bending R is set by the numerical input device 1 (S21). Next, the bending R setting process is started. That is, in this setting process, the desired bending R is input to the seat model stored in the seat model information memory 5 by the numerical input device 1 (S22), and the seat model displayed on the display device 13 is bent. The bending portion for setting R is designated by the pointing devices 2 and 3 (S2
3).

Next, the desired bend R is compared with the minimum bend R (input bend R> minimum bend R) (S24), and the input bend R
If the input bend R is small, the input bend R is set (S25). Conversely, if the input bend R is small, the minimum bend R is set (S2).
6). Next, it is determined whether or not all the bending R settings are completed (S27), and when it is determined that all the bending R settings are completed, the bending R setting processing for the bending R unset bending portion is started. To be done. That is, the bending R unset bending portion of the sheet model (FIG. 6A) is searched, and it is determined whether or not the bending R unsetting bending portion exists (S28). As a result, when it is determined that there is a bending R unset bending portion, for example, the minimum bending R is set in FIG. 6A (S29). further,
It is determined whether there is no R-unset bending portion (S30), and if there is a bending R-unsetting bending portion, for example, the minimum bending R setting is repeated for FIG. 6A. When it is determined in step S30 that there is no R-unset bending portion, that is, bending R is set in all bending portions, a series of processes is terminated and the process returns to the main routine (see FIG. 3).
The display shape after the solid conversion is as shown in FIG. 6 (b).

Next, an example of bending R setting for the solid model will be described. First, step S shown in FIG.
In 13, the correction of the solid model is started, and it is judged whether or not the correction is the change of the bend R (S31). If it is judged that the change is the bend R of the solid model, the change of the bend R is started. . A desired bending R is input to the solid model stored in the solid model information memory 8 by the numerical input device 1 (S32), and a bending portion for setting the bending R is set for the solid model displayed on the display device 13. It is designated by the pointing devices 2 and 3 (S33).

In the solid model, the radius is different between the inside and outside of the bent portion, so it is determined whether the designated bent portion is inside (S34). As a result, when it is determined that it is inside, the bend R input in step S32 and the minimum bend R are compared (input bend R> minimum bend R) (S3).
5) If the input bend R is large, the input bend R is set (S36), and conversely, if the input bend R is small, the minimum bend R is set (S37). In addition, the above step S3
When it is determined in step 4 that the designated bending portion is outside, the bending R input in step S32 and the minimum bending R + plate thickness are compared (input bending R> minimum bending R + plate thickness) (S38), When the input bend R is large, the input bend R is set (S39). On the contrary, when the input bend R is small, the minimum bend R + plate thickness is set (S40).

Next, the bending portion on the opposite side of the bending portion designated in step S33 is searched (S4).
1). The bending R + plate thickness is set (S42) or the bending R-plate thickness is set for the retrieved bent portion (S4).
3). Then, it is judged whether or not the bending R setting is completed (S
44), if it is determined that the process is completed, the deformation warning (S4
5) The crack warning (S46) is executed, and the process returns to the main routine.

In FIG. 7, for the bent portions A and B of the solid model (FIG. 7 (a)) having no bending setting, the inner bending portion A is designated in step S21, and the bending R is set for A. After that (FIG. 7 (b)), in step S29, the corresponding bending portion B is searched, and the bending R setting is executed (FIG. 7 (c)).

[Third Embodiment] Next, a third embodiment of the present invention will be described with reference to the drawings. FIG. 9 is a flowchart showing the operation of the notch shape setting process (crack warning), and FIG. 10 shows the shape model displayed by the display device 13 after the notch shape setting.

To set the notch shape for preventing cracks, first, refer to FIG.
The process starts from the crack warning process in step S46. First, the strength of the abutting portion of the plate is calculated (S51). Next, the crack occurrence location of the solid model is searched based on the calculated plate strength (S52). Here, it is judged whether or not there is a crack occurrence portion (S5
3) If there is no cracked portion, or if it is determined whether or not the cutout shape setting is necessary (S54), and if the operator determines that the cutout shape setting is unnecessary, this processing ends.

Next, if it is determined in step 53 that there is a crack occurrence point, and in step 54 that the operator needs to set the notch shape, the crack prevention notch shape is set ( S5
5). After that, it is determined whether or not there is another cracked portion (S56), and when it is determined that there is another cracked portion, the operation of step S55 is repeated. On the other hand, when it is determined that there is no other cracked place, the process returns to the main routine.

FIG. 10 (a) shows a search for a crack occurrence location in the product shape solid model. As a search method, for example, a range in which a crack such as C is generated is registered in advance. The size of C is determined by the plate strength with respect to the butted portion and the bending angle of the butted portion. If the solid model has a portion that overlaps with C, it is searched as a butt portion that causes a crack. FIG. 10B is a diagram of FIG.
It is a development shape model of (a). D, E, and F are notch shapes generated by this processing, and are the smallest not overlapping with C so as not to damage the product shape. Further, as the crack preventing shape, any notch shape can be registered and set in the solid model information memory 8 as required (see FIGS. 10C and 10D).

[Fourth Embodiment] Next, a fourth embodiment of the present invention will be described with reference to the drawings. FIG. 11 is a flowchart showing the operation of the bending deformation warning process (deformation warning),
FIG. 12 is a display example by the display device 13 during the bending deformation warning process.

The deformation warning process due to bending starts from the deformation warning process in step S45 shown in FIG. First, the strength of the plate against bending is calculated (S6
1). Next, the bending portion of the solid model is searched for a deformation occurrence portion due to bending (S62), it is determined whether there is a deformation occurrence location (S63), and when it is determined that a crack occurrence location exists, , Deformation warning display is executed (S
64). After that, it is determined whether or not there is another deformation occurrence portion (S65), and as a result, if there is another deformation occurrence portion, the operation of step S64 is repeated. In FIG. 12, since there is a deformation occurrence point with respect to the bent portion K,
It shows a state where the bending warning display G is executed. Arrow H
Indicates which bent portion causes the deformation.

The following expression 1 is a calculation formula representing a search method. A hole shape or the like closer than the deformation occurrence distance is searched for as the deformed shape. (Equation 1) d <di di = s * θ / k d: Distance from bent portion to characteristic shape di: Distance from bent portion to deformed shape s: Proportional constant θ: Bending angle k: Plate strength

[Fifth Embodiment] Next, a fifth embodiment of the present invention will be described with reference to the drawings. FIG. 13 is a flow chart showing the operation of the edit of the butt portion, the interference check and the dimension correction processing (solid model correction), and FIG.
FIG. 15 is a display example by the display device 13 at the time of the dimensional correction process of the butted portion, FIG. 15 is an example of the butted shape that can be set, and FIG. 16 is a flowchart showing the operation of the interference check at the time of solid model sum calculation, FIG. 17 is an example of a warning display by the display device 13 when an interference occurs.

First, an embodiment of the process of editing the butting portion, checking the interference and correcting the dimensions will be described. Figure 3
In step S13 shown in step S13, the solid model correction is started, and it is determined whether the correction is a change in the butt shape (S70). If the correction is a change in the butt shape,
This process starts. That is, a desired butt shape is selected from patterns registered in advance (S71), and two surfaces of the butt setting section of the solid model are selected by the pointing devices 2 and 3 (S72), and the butt shape setting is executed. Is done (S7
3).

Next, it is judged whether or not there is an interference portion on these two surfaces (S74), and if it is judged that there is an interference portion, a dimension change calculation process for eliminating the interference is performed ( S75). After that, it is determined whether or not the setting of the butt shape has been completed (S76), and when it is determined that the setting of the butt shape has been completed, a series of processes is ended.

In FIG. 14B, since the interference section I is searched for in the step S74 in the matching section set in the steps S71 to S73, the step S7 is executed.
5 shows a state in which the dimension reduction processing for the plate thickness is executed as shown in FIG. 14 (c). FIG. 14A shows
It is a sheet model showing the outer shape for creating the solid model of (b) and (c). It is possible to register and set a butt shape as shown in FIG. 15 so that a butt shape that matches a product shape can be obtained. Figure 1
5 (a) and 5 (b) are examples of butt shapes that can be butt-set, and FIGS. 15 (b) and 15 (d) are top views of the butt portions of FIGS. 15 (a) and 15 (c), respectively. is there.

Next, an embodiment of the interference check process (solid model correction) at the time of solid model sum calculation will be described. This interference check process is started by the solid model correction in step S13, and it is first determined whether the correction is a sum operation (S77). If the correction is a sum operation, the sum calculation is executed. Shi (S
78), this process starts. That is, where
When performing the difference / product calculation, a new interference unit does not occur, and therefore it is not necessary to perform the interference check. Therefore, it is determined whether or not there is a new interference section between the original model and the sum-calculated model (S79), and if it is determined that there is interference, the display device 13 An interference warning display is executed (S80).

For example, with respect to the solid model of FIG. 17A, the solid model (FIG. 17B) defined by the solid model defining unit 9 in step S78 and the solid model editing unit 10 perform the sum operation ( FIG. 17 (c)) was obtained. Further, since it is found in step S79 that there is an interference occurrence point between FIG. 17 (b) and FIG. 17 (a), the interference warning display as shown in FIG. 17 (c) is executed. Here, J in FIG. 17C indicates an example of the interference warning display.

[Embodiment 6] Next, a sixth embodiment of the present invention will be described with reference to the drawings. FIG. 18 is a flowchart showing the flow of the operation of the elongation amount calculation process (developing drawing creation) by bending, and FIG. 19 shows a display example by the display device 13 at the time of elongation amount correction.

The elongation amount calculation processing is started by the development drawing preparation processing in step S17 shown in FIG. The solid model stored in the solid model information memory 8 is developed (S81), and the bent portion is searched (S82). It is determined whether or not to perform processing other than V bending processing such as L bending processing on the searched bending portion (S8).
3) When performing processing other than V bending, such as L bending, the bending is designated (S84). The extension amount is calculated for this bent portion (S85), and the developed model is corrected (S86). Then, it is determined whether or not this correction is completed for all the bent parts (S87), and if it is judged that the correction is completed for all the bent parts, the process returns to the main routine. On the contrary, if it is determined that the processing is not completed, the operation from step S83 is repeated.

FIG. 19A shows a product shape model of a solid model, and the expanded shape generator 12a expands this to generate an expanded model shown in FIG. 19B. The elongation amount calculation calculates a line-neutral line which does not change in length depending on the plate material, plate thickness, and processing method. Formula 2 below is an example of an arithmetic expression for obtaining the position of the neutral line during V bending of aluminum. When the neutral line position is calculated, the expansion amount is calculated by the expansion amount calculation formula, and the bending portions L, M, N, O and N, P, Q, S are L ', M, N, O'and N, P ′,
It is corrected to Q ', S. FIG. 19C is a supplementary diagram for explaining the symbol of the following mathematical expression 2. According to this formula, for example, when aluminum with a plate thickness of 2 mm is processed by V-bending with a bending angle of 90 degrees and a bending radius of 3 mm, the arc LM
Has a length of 7.9 mm and the arc L'M 'has a length of 5.2.
mm.

(Equation 2) | L′ M ′ | = (π−θ) * {ri + 1} θ: Bending angle (unit rad) ri: Inner radius l: Inner radius determined by working method, plate material and plate thickness To the neutral line

[0056]

As described above, the CA according to the present invention
The D / CAM device makes it possible to define and edit a product shape model for a solid model whose product shape is easy, and to set the minimum bend R by calculation.
It is possible to predict cracks and shape deformation due to bending,
In addition, it is possible to correct the size of the location where the interference occurs, further improve the calculation accuracy of the stretch margin of the bent portion when generating the expanded shape, and the operator can easily (improve work efficiency),
In addition, the developed shape can be created with high accuracy.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a CAD / CAM device according to the present invention.

FIG. 2 is an explanatory diagram showing a transitional state of a model according to the present invention.

FIG. 3 is a flowchart showing a flow of a processing operation (main routine) of the CAD / CAM device according to the present invention.

FIG. 4 is a flowchart showing a flow (main routine) of a processing operation of the CAD / CAM device according to the present invention.

FIG. 5 is a flow chart showing a flow of bending R setting to a bending portion having no bending R setting and a minimum bending R setting processing operation in the seat model according to the present invention.

FIG. 6 is an explanatory diagram showing an example of minimum bending R setting for a bending portion having no bending R setting for the seat model according to the present invention.

FIG. 7: Bending R for a solid model according to the present invention
It is an example of setting.

FIG. 8: Bending R in a solid model according to the present invention
It is a flow chart showing a flow of setting processing operation.

FIG. 9 is a flowchart showing a flow of a crack prevention notch shape setting processing operation according to the present invention.

FIG. 10 is an explanatory view showing an example of setting of a crack prevention notch shape according to the present invention.

FIG. 11 is a flowchart showing a flow of processing operation of a shape deformation warning by bending according to the present invention.

FIG. 12 is an explanatory view showing an example of a shape deformation warning due to bending according to the present invention.

FIG. 13 is a flow chart showing a flow of a dimensional change processing operation by butt shape setting and interference check according to the present invention.

FIG. 14 is an explanatory diagram showing an example of dimensional change processing by butt shape setting and interference check according to the present invention.

FIG. 15 is an explanatory diagram showing an example of a butt shape that can be set according to the present invention.

FIG. 16 is a flowchart showing the flow of processing operation of interference check at the time of correcting the solid model according to the present invention.

FIG. 17 is an explanatory diagram showing an example of interference check processing when correcting a solid model according to the present invention.

FIG. 18 is a flow chart showing a flow of an elongation amount calculation processing operation by bending according to the present invention.

FIG. 19 is an explanatory diagram showing an example of an elongation amount calculation process by bending according to the present invention.

FIG. 20 is an explanatory diagram showing a schematic configuration of a conventional CAD / CAM device.

FIG. 21 is a flowchart showing a flow of processing operation of a conventional CAD / CAM device.

22 is an explanatory diagram showing each operation corresponding to the flowchart shown in FIG. 21. FIG.

23 is an explanatory diagram showing each operation corresponding to the flowchart shown in FIG. 21. FIG.

[Explanation of symbols]

 1 Keyboard 2 Mouse 3 Tablet 4 Sheet Model Definition Section 5 Sheet Model Information Memory 6 Sheet Model Editing Section 7 Solid Model Conversion Section 8 Solid Model Information Memory 9 Solid Model Definition Section 10 Solid Model Editing Section 11 Interference Check Section 12a Expansion Shape Generation Section 13 Display

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] August 5, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0024

[Correction method] Change

[Correction content]

Next, the operation will be described. 2 (a)-
(H) shows the target product shape and the shape model displayed by the display device 13, and FIGS. 3 and 4 are flowcharts showing the flow of operations from the definition of the shape model to the creation of the expanded shape.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0040

[Correction method] Change

[Correction content]

To set the notch shape for preventing cracks, first, refer to FIG.
The process starts from the crack warning process in step S46. First, enter the strength for the butted part of the plate
Calculation is performed based on the obtained plate material and plate thickness data (S5
1). Next, the crack occurrence location of the solid model is searched based on the calculated plate strength (S52). Here, it is determined whether or not there is a crack occurrence location (S53), if there is no crack occurrence location, or if it is necessary to set the notch shape (S54), the operator sets the notch shape. If it is determined that is unnecessary, this process ends.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0054

[Correction method] Change

[Correction content]

FIG. 19A shows a product shape model of a solid model, and the expanded shape generator 12a expands this to generate an expanded model shown in FIG. 19B. The elongation amount calculation calculates a line-neutral line which does not change in length depending on the plate material, plate thickness, and processing method. Formula 2 below is an example of an arithmetic expression for obtaining the position of the neutral line during V bending of aluminum. When the neutral line position is calculated, the expansion amount is calculated by the expansion amount calculation formula, and the bending portions L, M, N, O and N, P, Q, S are L ', M, N, O'and N, P ′,
It is corrected to Q ', S. FIG. 19C is a supplementary diagram for explaining the symbol of the following mathematical expression 2. According to this formula, for example, when aluminum with a plate thickness of 2 mm is processed by V-bending with a bending angle of 90 degrees and a bending radius of 3 mm, the arc LM
Has a length of 7.9 mm and the arc L'M 'has a length of 5. 8
mm.

[Procedure amendment 4]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 6

[Correction method] Change

[Correction content]

[Figure 6]

[Procedure Amendment 5]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 13

[Correction method] Change

[Correction content]

[Fig. 13]

[Procedure correction 6]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 19

[Correction method] Change

[Correction content]

FIG. 19

Claims (7)

[Claims] 1. A sheet model defining means for defining a plate-like product shape by a sheet model having no thickness, a sheet model editing means for editing a sheet model by designating a bend and a notch shape, and a thickness is added to the sheet model. Solid model generating means for generating a solid model, solid model defining means for defining a thick solid model, solid model editing means for editing the solid model by calculation, interference searching means for searching for model interference, and solid And a developed shape generating means for developing a model and generating a developed shape model.
D / CAM device. 2. A sheet model defining means for defining a plate-like product shape by a sheet model having no thickness, a sheet model editing means for editing a sheet model by designating a bending or notch shape, and a thickness for the sheet model. Solid model generating means for generating a solid model, solid model defining means for defining a thick solid model, solid model editing means for editing the solid model by calculation, interference searching means for searching for model interference, and solid In a CAD / CAM device equipped with a developed shape generation means for developing a model and generating a developed shape model, a bend shape generation / editing means for generating and editing a bend shape by designating a bend R for a model bend portion, Minimum bending R calculation means for calculating the minimum bending R by inputting the plate material / thickness, and no bending R designation A CAD / CAM device comprising: a bending part searching means for searching for a bending part; and a side searching device for searching for two corresponding sides of one bending part in a solid model. 3. A sheet model defining means for defining a plate-like product shape with a sheet model having no thickness, a sheet model editing means for editing a sheet model by designating a bending shape or a notch shape, and a thickness is added to the sheet model. Solid model generating means for generating a solid model, solid model defining means for defining a thick solid model, solid model editing means for editing the solid model by calculation, interference searching means for searching for model interference, and solid In a CAD / CAM device equipped with a developed shape generating means for developing a model and generating a developed shape model, a butt portion searching means for searching a butt portion causing a crack by designating a plate material / thickness, and a notch It has a notch shape setting and editing means for setting the shape and editing the model. CAD / CAM device to collect. 4. A sheet model defining means for defining a plate-like product shape with a sheet model having no thickness, a sheet model editing means for editing a sheet model by designating a bending shape and a notch shape, and a thickness is added to the sheet model. Solid model generating means for generating a solid model, solid model defining means for defining a thick solid model, solid model editing means for editing the solid model by calculation, interference searching means for searching for model interference, and solid A CAD / CAM device equipped with a developed shape generating means for developing a model and generating a developed shape model, comprising search warning means for searching for a shape of a hole or the like that is deformed by bending according to the bending R setting and issuing a warning. CAD / CAM device characterized by: 5. A sheet model defining means for defining a plate-like product shape by a sheet model having no thickness, a sheet model editing means for editing a sheet model by designating a bending or notch shape, and a thickness for a sheet model. Solid model generating means for generating a solid model, solid model defining means for defining a thick solid model, solid model editing means for editing the solid model by calculation, interference searching means for searching for model interference, and solid In a CAD / CAM apparatus equipped with a developed shape generation means for developing a model and generating a developed shape model, an edit location interference check means for checking the edit location interference of an edited solid model and an interference of a butt section are checked. Modify the butt section interference check means to be checked and the dimensions when interference occurs. A CAD / CAM device comprising a correct dimension correcting means. 6. A sheet model defining means for defining a plate-like product shape by a sheet model having no thickness, a sheet model editing means for editing a sheet model by designating a bending or notch shape, and a thickness is added to the sheet model. Solid model generating means for generating a solid model, solid model defining means for defining a thick solid model, solid model editing means for editing the solid model by calculation, interference searching means for searching for model interference, and solid In a CAD / CAM device equipped with a developed shape generation means for developing a model and generating a developed shape model, the bending portion is expanded when the solid model is developed by designating a bending method and inputting a plate material, a plate thickness, and a bending angle. CAD / CA characterized by comprising a calculation correction means for calculating the amount and correcting the developed shape. M device. 7. Regarding the change of the data stored in the solid model information storage means, when the data needs to be changed, a new solid model is defined by the solid model definition means, and then the defined solid model is defined. If there is an interference part in the solid model, determine whether it is necessary to modify the solid model. If it is determined that the solid model needs to be modified, modify the solid model. A solid model correction method for a CAD / CAM device characterized by the above.