JP2815278B2 - CAD / CAM apparatus and method for correcting solid model thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CAD / CAM apparatus and a method for correcting a solid model thereof, and more particularly to a CAD / CAM apparatus capable of generating and editing a shape model via a sheet model and a solid model and a solid model thereof. 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 device in a conventional CAD / CAM device. In the figure, 1 is a numerical input device such as a keyboard, 2 and 3 are pointing devices for inputting coordinates such as a mouse and a tablet, 4 is a numerical input device 1,
A sheet model definition unit that defines a product shape as a sheet model having no thickness from the numerical coordinate values input by the pointing devices 2 and 3, and a sheet model information memory 5 that stores sheet model data generated by the sheet model definition unit 4. , 6 is a sheet model editing unit for modifying the sheet model stored in the sheet model information memory 5, and 7 is a solid model conversion for defining the thickness of the sheet model stored in the sheet model information memory 5 and converting it to a solid model. A solid model information memory 8 for storing the solid model data converted by the solid model conversion unit 7; an interference check unit 11 for checking the interference of the solid model data stored in the solid model information memory 8; The 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 or a solid model.

[0003] Here, a solid model is a model in which information of a surface model (a wire frame model (a model using only data of its contour when an object is represented on a computer)) is provided with "surface" data. ] In addition to the above data.

Here, the sheet model is similar to the above-mentioned surface model, but the surface model represents all surfaces of the object, while the sheet model represents only a part of the surface of the object. Since a sheet metal is assumed to be a plate having a constant thickness, an object can be represented by a sheet model. However, a sheet model cannot exist other than a sheet metal, for example, a mold.

Next, the notch will be described. When bending a thick plate, the bending edge is distorted. This distortion increases the dimensions of the product. In addition, cracks may occur when the strain increases. In order to prevent such a situation, when cutting the plate, a hole or the like is formed in advance at a location where a crack occurs. Such a shape, such as holes in the ends of the bent called notch that opens Keru, that shape notched shape.

[0006] Further, "deployment" refers to stretching a sheet metal product into a flat shape. Sheet metal products are obtained by processing one or more flat plates. Here, processing is cutting,
It refers to bending and welding. In order to create a desired sheet metal product, it is necessary to reverse the operation of bending to determine the sheet shape to be formed. When CAD is not used, a developed shape is created by consideration on a desk.

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

Next, the sheet model is developed by the developed shape generation unit 12 to create a developed view (S94 / FIG. 22).
(C)). Enter the thickness of the developed shape (S95),
The sheet model editing unit 6 sets the notch shape according to the sheet thickness (S96), calculates the amount of elongation of the bent part, and corrects the developed view (S97 / FIG. 22 (d)). In order to confirm the product shape model when the development view is corrected, the solid model conversion unit 7 performs a solid model conversion of the sheet model stored in the sheet model information memory 5 (S98 / FIG. 22 (e)). It is stored in the solid model information memory 8.

Next, an interference check process of the solid model is executed by the developed shape generation unit 12. That is, it is determined whether or not an interference portion has occurred (S99), and if interference exists, the above-described steps S91 to S98 are performed.
Is repeated. Conversely, if there is no interference, it is next determined whether or not the shape correction is unnecessary (S10).
0), when it is determined that it is unnecessary, a series of operations is ended.
Conversely, if it is determined that shape correction is necessary, that is, if the operator confirms the solid model on the display device 13 and there is a design change or an input error, the above-described step S9 is performed.
The subsequent operations are repeated from the sheet model definition of FIG.
3 (f) to (j)).

[0010] In addition, as a reference technical document related to the present invention, a "three-sided view system for sheet metal parts" disclosed in Japanese Patent Application Laid-Open No. 1-106176, and Japanese Patent Application Laid-Open No. 2-41573.
"Solid CAD system" disclosed in
Japanese Patent Application Laid-Open No. 63-130220 discloses a "sheet metal development view data generating apparatus", and Japanese Patent Application Laid-Open No. 64-88778.
Japanese Patent Application Laid-Open No. 4-114168 discloses a "developed view development method of bent parts", Japanese Patent Application Laid-Open No. 4-213168 discloses a "self-interference three-dimensional correction device", and Japanese Patent Application Laid-Open No. 4-114283 discloses " 3D solid model creation method ".

[0011]

SUMMARY OF THE INVENTION Conventional CAD /
Since the CAM device is configured as described above, there are the following problems. That is, first, when the solid-converted model is modified by a design change or the like, it is necessary to start over from the sheet model definition, and there is a problem that the operation up to the creation of the product development shape is troublesome. Second
In addition, there is a problem that a minimum limit value due to a thick plate material exists in the R of the bent portion, and when a value smaller than this value is set to calculate the developed view, a dimensional error occurs in actual machining. . Third, since the notch shape setting for crack prevention is calculated and set only from the thickness information, the characteristics of the sheet material cannot be taken into account, so that the notch shape having a size larger than necessary is set, and the appearance of the product shape is improved. There was a problem of spoiling. Fourth,
In the solid model, deformation due to bending such as a hole shape is not taken into account, so a deformation is found for the first time during actual machining, and a new design change must be made at that time, resulting in poor work efficiency. Fifth, it is difficult to confirm the product shape because the abutment shape setting is performed for a sheet model with no thickness, and the shape may be confirmed after solid conversion and a setting error may be found. And the amount of operation increases. Sixth, there is a problem that the interference check is a processing method that is performed at one time, it takes a long time to perform the processing, and the model correction must be performed at a time, resulting in poor work efficiency. Seventh, since the elongation at the time of expanding the bent portion was calculated only from the plate thickness and the bending angle,
There was a problem that the characteristics of the bending process and the characteristics of the plate material could not be considered, and the accuracy of the developed shape model was poor.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is possible to define and edit a product shape model for a solid model having an easy product shape, and to minimize the minimum bending. It is possible to set the calculation of R, furthermore, it is possible to predict cracks and shape deformation due to bending work, and it is possible to correct the dimensions of the location where interference occurs,
Further, a CAD / CAM apparatus and a solid model thereof capable of increasing the calculation accuracy of the extension of the bent portion when generating the developed shape and allowing the operator to easily (improve work efficiency) and create the developed shape with high accuracy. The aim is to get a fix.

[0013]

According to the present invention, CAD /
The CAM device is 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 bent or notched shape, and a solid model for adding thickness to a sheet model. Solid model generating means for generating a model, solid model defining means for defining a thick solid model, solid model editing means for editing a solid model by operation, interference searching means for searching for model interference, and solid model And a developed shape generating means for generating 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 bent or notched shape, and a method for thickening a sheet model. A solid model generating means for generating a solid model; a solid model defining means for defining a thick solid model; a solid model editing means for editing a solid model by calculation; an interference searching means for searching for model interference; In a CAD / CAM apparatus having a developed shape generating means for developing a model and generating a developed shape model, a bent shape generating / editing means for generating and editing a bent shape by designating a bending R for a model bending portion; A minimum bending R calculating means for calculating a minimum bending R by inputting a plate material and a thickness, and a bending R designation 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, sheet model defining means for defining a plate-like product shape by a sheet model having no thickness, sheet model editing means for editing a sheet model by designating a bent or notched shape, and adding a thickness to the sheet model. A solid model generating means for generating a solid model; a solid model defining means for defining a thick solid model; a solid model editing means for editing a solid model by calculation; an interference searching means for searching for model interference; In a CAD / CAM apparatus provided with a developed shape generating means for developing a model and generating a developed shape model, a butt portion searching means for searching for a butt portion for generating a crack by designating a plate material and a thickness, and a notch Notch shape setting and editing means for setting a shape and editing a model. It is.

Further, sheet model defining means for defining a plate-like product shape by a sheet model having no thickness, sheet model editing means for editing a sheet model by designating a bent or notched shape, and adding a thickness to the sheet model. A solid model generating means for generating a solid model; a solid model defining means for defining a thick solid model; a solid model editing means for editing a solid model by calculation; an interference searching means for searching for model interference; A CAD / CAM apparatus having a developed shape generating means for developing a model and generating a developed shape model, comprising a search / warning means for searching for a shape such as a hole deformed by bending according to the bending R setting and issuing a warning. 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 bent or notched shape, and adding a thickness to the sheet model. A solid model generating means for generating a solid model; a solid model defining means for defining a thick solid model; a solid model editing means for editing a solid model by calculation; an interference searching means for searching for model interference; In a CAD / CAM apparatus provided with a developed shape generation means for developing a model and generating a developed shape model, an edit location interference check means for checking an edit location interference of an edited solid model, and an interference of a butted portion. Butch interference checking means to be checked and the dimension when interference occurs 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 bent or notched shape, and a method for thickening a sheet model. A solid model generating means for generating a solid model; a solid model defining means for defining a thick solid model; a solid model editing means for editing a solid model by calculation; an interference searching means for searching for model interference; In a CAD / CAM apparatus equipped with a developed shape generating means for developing a model and generating a developed shape model, the bending portion elongation at the time of solid model development is performed by designating a bending method and inputting a plate material, a plate thickness, and a bending angle. It is provided with operation correction means for calculating the quantity and correcting the developed shape.

The method for correcting a solid model of a CAD / CAM apparatus according to the present invention relates to a change in data stored in a solid model information storage means. The process of defining a new solid model and the new definition
The existing solid model
A predetermined operation is performed in relation to
A step of registering the Dell information storage means, when the interference portion occurs in solid model defined comprises the steps of determining whether it is necessary to modify the solid model, it is necessary to modify the solid model And executing a correction of the solid model.

[0020]

According to the present invention, a solid model converted from a sheet model or a newly generated solid model is subjected to a sum / difference / product operation (Boolean (logical) operation), a bending R,
Edit the solid model by setting the butt shape. Further, 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 bent portion having no designated bend R. Further, for the bent portion of the solid model, a bend R is set for the specified bent portion and the searched bent portion on the opposite side.

Further, a specified notch shape is set at the found crack occurrence position. In addition, the detected deformation shape due to 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 dimension that does not cause interference. Also, an interference check is performed on the solid model editing location, and a warning is given on the display device for the interference portion. Furthermore, the input bending method, the plate material of the bending part,
Based on the thickness and bending angle information, the amount of elongation is calculated to correct the developed shape.

[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,
Reference numeral 3 denotes a pointing device for inputting coordinates, reference numeral 4 denotes a numerical value input device 1, and a sheet model definition unit for defining a product model having no thickness from a numerical coordinate value input by the pointing devices 2 and 3, and reference numeral 5 denotes a sheet model definition. A sheet model information memory 6 for storing the sheet model data generated by the unit 4, and a sheet model editing unit 6 for modifying the sheet model stored in the sheet model information memory 5.

Reference numeral 7 denotes a solid model conversion unit for defining the thickness of the sheet model stored in the sheet model information memory 5 and converting the thickness into a solid model, and 8 stores the solid model data converted by the solid model conversion unit 7. A solid model information memory 9; a solid model definition unit 9 for defining a solid model from numerical coordinate values input by the numerical value input device 1 and the pointing devices 2 and 3;
Reference numeral 10 denotes a solid model editing unit that modifies the solid model stored in the solid model information memory 8, reference numeral 11 denotes an interference check unit that checks the interference of the solid model data corrected by the solid model editing unit 10, and 12
Reference numeral a denotes a developed shape generating 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. FIG.
(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 developed shape.

First, the number of the plate material registered in advance by the numerical value input device 1 and the thickness of the plate, for example, 1.0 mm
If so, enter 1.0 (S1). Next, a sheet model is defined from the coordinate values input by the pointing devices 2 and 3, for example, the reference coordinate values, and the numerical values input by the numerical value input device 1, for example, the size of the shape (S2). In this step S2, a sheet model is created by the sheet model definition unit 4 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. 2A)
(B)) is displayed.

Further, the sides of the sheet model displayed on the display device 13 are indicated by the pointing devices 2 and 3, and necessary data, for example, 5.0 for a bending R of 5.0 mm is input by the numerical value input device 1 ( S3). In addition, notch shape setting (S4) and butting shape setting (S5) are executed. The 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 displayed on the display device 13 as, for example, a feature 22 (FIG. 2C). . It is determined whether further correction or change is necessary for the sheet model in which the respective settings (S3 to S5) of the bending R, the notch shape, and the butting shape are made (S6).
If it is determined that it is necessary, the above steps S3 to S5
repeat. Conversely, if it is determined that the sheet model does not need to be modified or changed, the solid model conversion unit 7 converts the sheet model data stored in the sheet model information memory 5 into the sheet model input in step S1. Stretch by thickness and convert to solid model (S
7).

Here, the solid model is a model that has a thickness and can represent all of the outside and inside shapes, while the sheet model represents only the outside or inside shape of the product. The converted solid model is stored in the solid model information memory 8 and, for example,
It is displayed as a feature 23 (FIG. 2 (d)).

Next, the flow shifts to the flowchart shown in FIG. 4. First, it is determined whether or not a new board needs to be added or deleted with respect to 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, a new solid model is defined in the solid model definition unit 9 (S9). The solid model definition includes a method of defining a contour shape and creating a rectangular parallelepiped based on a previously input plate thickness, and a method of creating a cuboid by inputting a dimension value to the initially prepared shape.

Next, the solid model editing unit 10 performs a sum / difference / product operation (Boolean (logical)) with the existing solid model.
(Hereinafter, the same shall apply hereinafter) and register it in the solid model information memory 8. Here, the sum, difference, and product operations are 2
All of the two models are obtained by removing a certain model from a certain model to obtain an intersection of the two models. For example, add a caught portion of the lid to form 23, when performing a hole open <br/> only, first, the shape of the latching portion 24 (FIG. 2
(E)), the shape of the hole 25 (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 operation and difference operation (correction) with the form 23. It is created (S10).

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

Thereafter, it is determined whether or not an interference portion exists (S14). If it is determined that an interference portion exists, then it is determined whether or not the correction of the solid model has been completed. (S15) If it is determined that the correction of the solid model has been completed, then it is determined whether a new solid model definition has been completed (S16). Therefore, if it is determined that the new solid model definition has been completed,
The developed model is developed in the solid model information memory 8 by the developed shape generation unit 12a (S17), and a series of operations is completed.

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

First, one embodiment of setting a bending radius for a sheet model will be described. First, step S3 shown in FIG.
When the setting of the bend R is started, the minimum radius minimum bend R in the range in which the plate can be bent is calculated based on the input plate material and plate thickness data. If necessary, the minimum bend R is set by the numerical value input device 1 (S21). Next, the bending R setting process is started. That is, in this setting process, a desired bending R is input to the sheet model stored in the sheet model information memory 5 by the numerical value input device 1 (S22), and the desired bending R is applied to the sheet model displayed on the display device 13. 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).
Is larger, the input bend R is set (S25). Conversely, if the input bend R is smaller, the minimum bend R is set (S2).
6). Next, it is determined whether or not all the bending R settings have been completed (S27). If it is determined that all the bending R settings have been completed, the bending R setting processing for the bending portion where the bending R has not been set is started. Is done. That is, a bent portion where the bending R is not set in the sheet model (FIG. 6A) is searched, and it is determined whether or not a bending portion where the bending R is not set exists (S28). As a result, when it is determined that there is a bent portion where the bending R is not set, for example, the minimum bending R is set in FIG. 6A (S29). further,
It is determined whether there is no bent portion with no R setting (S30), and if there is a bending portion with no bending R set, for example, the minimum bending R setting is repeated for FIG. 6A. In step S30, when it is determined that there is no R-unset bent portion, that is, when it is determined that the bend R has been set in all the bent portions, a series of processes is completed and the process returns to the main routine (see FIG. 3).
The display shape after the completion of the solid conversion is as shown in FIG.

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

In the solid model, since the radius is different between the inside and outside of the bent portion, it is determined whether or not the designated bent portion is inside (S34). As a result, when it is determined that the bending is inside, the bending R input in step S32 and the minimum bending R are compared (input bending R> minimum bending R) (S3).
5) If the input bend R is large, the input bend R is set (S36). Conversely, if the input bend R is small, the minimum bend R is set (S37). In addition, step S3
In step 4, if it is determined that the designated bending portion is outside, the bending R input in step S32 is compared with the minimum bending R + plate thickness (input bending R> minimum bending R + plate thickness) (S38), If the input bend R is large, the input bend R is set (S39). Conversely, if the input bend R is small, the minimum bend R + plate thickness is set (S40).

Next, a search is made for a bend on the opposite side of the bend specified in step S33 (S4).
1). For the searched bent portion, a bending R + thickness is set (S42) or a bending R- thickness is set (S4).
3). Then, it is determined whether the bending R setting is completed (S
44) If it is determined that the processing has been completed, a deformation warning (S4
5) A 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. 7A) having no bending setting, the inner bending portion A is designated in step S21, and the bending R setting for A is performed. Thereafter (FIG. 7 (b)), in step S29, the corresponding bent 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 (break warning), and FIG. 10 shows a shape model displayed by the display device 13 after setting the notch shape.

First, the setting of the crack prevention notch shape is performed as shown in FIG.
From the crack warning process in step S46. First, the strength of the butted portion of the plate is calculated based on the input plate material and plate thickness data (S5).
1). Next, a 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 portion (S53). If there is no crack occurrence portion, or it is determined whether or not notch shape setting is necessary (S54), the operator sets the notch shape. If it is determined that is unnecessary, this process is terminated.

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

FIG. 10A shows a search for a crack occurrence location in a product-shaped 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 this C, it is searched for as a butting portion that generates a crack. FIG.
It is a development shape model of (a). D, E, and F are notch shapes generated by this processing, and are the smallest shapes that do not overlap with C so as not to damage the product shape. Further, as the crack prevention shape, an optional notch shape can be registered and set in the solid model information memory 8 as necessary (see FIGS. 10C and 10D).

Embodiment 4 Next, a fourth embodiment according to 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), and FIG. 12 is a display example on 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 against bending of the plate is calculated (S6).
1). Next, for the bent portion of the solid model, a location where deformation is caused by bending is searched (S62), and it is determined whether or not there is a deformation location (S63). Execute deformation warning display (S
64). Thereafter, it is determined whether or not there is another deformation occurrence location (S65). As a result, if there is another deformation occurrence location, the operation of step S64 is repeated. FIG. 12 shows that there is a deformed portion with respect to the bent portion K,
This shows a state in which the bending warning display G has been executed. Arrow H
Represents which bending portion the deformation is caused by.

Equation 1 below is a calculation formula representing a search method. A hole shape that is shorter than the deformation occurrence distance is searched for as a deformed shape. [Equation 1] d <di di = s * θ / k d: distance from bent portion to characteristic shape di: distance from bent portion to deformation occurrence 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 flowchart showing the operation of the editing of the matching part, the interference check, and the dimension correction processing (solid model correction). FIG. 14 is a display example of the display device 13 at the time of the dimension correction processing of the matching part. Fifteen
FIG. 16 is an example of a settable butting shape, FIG. 16 is a flowchart showing an operation of an interference check at the time of solid model sum calculation, and FIG. 17 is an example of a warning display by the display device 13 when an interference occurs.

First, a description will be given of an embodiment of the editing of the butted portion, the interference check, and the dimension correction processing. FIG.
The solid model correction is started in step S13 shown in (1), and it is determined whether or not the correction is a change in the butted shape (S70).
This process starts. That is, when a desired matching shape is selected from the patterns registered in advance (S71), and two surfaces of the matching setting unit of the solid model are selected by the pointing devices 2 and 3 (S72), the matching shape setting is executed. (S7
3).

Next, it is determined whether or not an interference portion exists between the two surfaces (S74). If it is determined that an interference portion exists, a dimension change calculation process for removing the interference is performed (S74). S75). Thereafter, it is determined whether or not the setting of the butting shape has been completed (S76). If it is determined that the setting of the butting shape has been completed, a series of processing ends.

FIG. 14 (b) shows that the interference portion I was found in step S74 in the matching portion set in steps S71 to S73.
5 shows a state in which the size reduction processing for the plate thickness has been executed as shown in FIG. FIG.
It is a sheet model representing an outer form for creating the solid models of (b) and (c). It is possible to register and set the butting shape as shown in FIG. 15 so that the butting shape according to the product shape becomes possible. FIG.
5 (a) and (b) are examples of setting of a butting shape which can be set to a butting, and FIGS. 15 (b) and (d) are top views of the butting portion of FIGS. 15 (a) and (c), respectively. is there.

Next, an embodiment of the interference check processing (solid model correction) at the time of the solid model sum calculation will be described. This interference check processing is started by the correction of the solid model in step S13. First, it is determined whether or not the correction is a sum operation (S77). If the correction is determined to be a sum operation, the sum operation is executed. (S
78), this process starts. That is,
When performing the difference / product operation, there is no need to execute an interference check because no new interference part occurs. Therefore, it is determined whether or not a new interference portion exists between the sum-calculated model and the original model (S79). An interference warning display is executed (S80).

For example, with respect to the solid model of FIG. 17A, the solid model defined by the solid model definition unit 9 (FIG. 17B) and the solid model editing unit 10 perform a sum operation in step S78. As shown in FIG.
A solid model was obtained. In addition, since it was found in step S79 that there was an interference occurrence point between FIG. 17B and FIG. 17A, an interference warning display as shown in FIG. 17C was executed. Here, FIG.
J in (c) shows an example of an 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 (creation of a development view) due to bending, and FIG.
Shows a display example by the display device 13 at the time of elongation correction.

The elongation calculation processing is first started by the development view creation processing in step S17 shown in FIG. The solid model stored in the solid model information memory 8 is developed (S81), and its bent portion is searched (S82). It is determined whether to perform processing other than V bending processing such as L bending processing on the searched bent portion (S8).
3) When performing processing other than V bending processing such as L bending processing, the bending processing is designated (S84). The amount of elongation is calculated for this bent portion (S85), and the developed model is corrected (S86). Thereafter, it is determined whether or not this correction has been completed for all the bent portions (S87). If it is determined that the correction has been completed for all the bent portions, the process returns to the main routine. Conversely, if it is determined that the processing has not been completed, the operation from step S83 is repeated.

FIG. 19A shows a product shape model of a solid model, and the developed shape generating unit 12a develops this to generate a developed model shown in FIG. 19B. In the elongation calculation, a line invariant line in development is calculated based on the sheet material, the sheet thickness, and the processing method. Equation 2 below is an example of an arithmetic expression for calculating the position of the neutral line during V bending of aluminum. When the neutral line position is calculated, the amount of elongation is calculated by the elongation amount calculation formula, and the bent portions L, M, N, O and N, P, Q, S are L ', M, N, O' and N, P ',
Q 'and S are corrected. FIG. 19C is a supplementary diagram for explaining the symbol of the following Expression 2. According to this equation, for example, when performing bending at a bending angle of 90 degrees and bending radius of 3 mm on aluminum having a thickness of 2 mm by V-bending, the arc LM
Is 7.9 mm, and the length of the arc L'M 'is 5.8.
mm.

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

[0056]

As described above, the C according to the present invention is used.
According to the AD / CAM device , the plate-like product shape has no thickness
Define by sheet model, specify bending and notch shape
Edit the sheet model by adding a thickness to the sheet model
To generate a solid model.
Define the Dell, edit the solid model through computation, and
Search for Dell interference, expand solid model, expand
Generate and generate shape models, define and edit product shape models
Can be performed on solid models with easy product shapes.
In this case, the developed shape can be created with high accuracy.

[0057] According to the CAD / CAM device according to the next invention,
If the bending radius is specified for the model bending part, the bending shape
Is generated / edited, and the minimum bending R is calculated by inputting the plate material and thickness.
Calculates and searches for a bent part without a specified bending radius.
Does Dell Find Two Corresponding Edges of One Bend
Accordingly, the calculation setting of the minimum bending R is enabled.

[0058] According to the CAD / CAM device according to the next invention,
If the sheet material and thickness are specified,
Search for joints, set notch shape, edit model
To predict cracking and deformation due to bending.
Can be.

[0059] According to the CAD / CAM device according to the next invention,
If it is, the shape of the hole deformed by bending according to the bending R setting
Operators can easily search for alerts by searching
The shape can be recognized.

[0060] According to the CAD / CAM device according to the next invention,
To check for interference at the edited location of the edited solid model.
And check for interference at the butted part, and
of time Since dimensions are corrected, the size of the location where interference occurs is efficient
Can be modified.

[0061] According to the CAD / CAM device according to the next invention,
Specify the bending method and enter the sheet material, sheet thickness, and bending angle.
Calculate the amount of elongation of the bent part when developing a solid model by using force
Since the developed shape is modified,
The calculation accuracy of the extension of the bent portion can be improved.

[0062] According to the CAD / CAM device according to the next invention,
Changes in stored data
Define a new solid model if needed
Then, in the defined solid model,
If yes, do you need to modify the solid model?
And determine that the solid model needs to be modified.
If so, do you want to modify the solid model?
To improve the working efficiency and create the unfolded shape with high accuracy.
Can be achieved.

[Brief description of the 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 transition state of a model according to the present invention.

FIG. 3 is a flowchart showing a flow (main routine) of a processing operation 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 flowchart showing a flow of a bending R setting process for a bent portion having no bending R setting and a minimum bending R setting process operation in the sheet model according to the present invention.

FIG. 6 is an explanatory diagram showing an example of a minimum bending R setting for a bent portion without a bending R setting for a sheet model according to the present invention.

FIG. 7 shows bending R for a solid model according to the invention.
It is an example of a setting.

FIG. 8 shows bending R in a solid model according to the present invention.
It is a flowchart showing the flow of a 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 diagram showing an example of setting of a crack prevention notch shape according to the present invention.

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

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

FIG. 13 is a flowchart showing a flow of a dimension change processing operation by setting a butted shape and interference check according to the present invention.

FIG. 14 is an explanatory diagram showing an example of a dimension changing process by setting a butt shape and checking for interference according to the present invention;

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

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

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

FIG. 18 is a flowchart 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 a processing operation of a conventional CAD / CAM device.

FIG. 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;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Keyboard 2 Mouse 3 Tablet 4 Sheet model definition part 5 Sheet model information memory 6 Sheet model editing part 7 Solid model conversion part 8 Solid model information memory 9 Solid model definition part 10 Solid model editing part 11 Interference check part 12a Deployment shape generation part 13 Display device

Claims (7)

(57) [Claims] 1. A sheet model defining means for defining a plate-shaped product shape by a sheet model having no thickness, a sheet model editing means for editing a sheet model by designating a bent or notched shape, and a method for thickening a sheet model. A solid model generating means for generating a solid model; a solid model defining means for defining a thick solid model; a solid model editing means for editing a solid model by calculation; an interference searching means for searching for model interference; 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 bent or notched shape, and adding a thickness to the sheet model. A solid model generating means for generating a solid model; a solid model defining means for defining a thick solid model; a solid model editing means for editing a solid model by calculation; an interference searching means for searching for model interference; In a CAD / CAM apparatus having a developed shape generating means for developing a model and generating a developed shape model, a bent shape generating / editing means for generating and editing a bent shape by designating a bending R for a model bending portion; A minimum bending R calculating means for calculating a minimum bending R based on input of a sheet material and a thickness, and no bending R designation A CAD / CAM apparatus, comprising: a bent portion search means for searching for a bent portion; and a side search means for searching for two corresponding sides of one bent portion in a solid model. 3. 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 bent or notched shape, and adding a thickness to the sheet model. A solid model generating means for generating a solid model; a solid model defining means for defining a thick solid model; a solid model editing means for editing a solid model by calculation; an interference searching means for searching for model interference; In a CAD / CAM apparatus provided with a developed shape generating means for developing a model and generating a developed shape model, a butt portion searching means for searching for a butt portion for generating a crack by designating a plate material and a thickness, and a notch Notch shape setting and editing means for setting the shape and editing the model. CAD / CAM device 4. 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 bent or notched shape, and adding a thickness to the sheet model. A solid model generating means for generating a solid model; a solid model defining means for defining a thick solid model; a solid model editing means for editing a solid model by calculation; an interference searching means for searching for model interference; In a CAD / CAM apparatus provided with a developed shape generating means for developing a model and generating a developed shape model, a search / warning means for searching for a shape such as a hole deformed by bending according to the bending R setting and warning the user is provided. A CAD / CAM device characterized by the above-mentioned. 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 bent or notched shape, and adding a thickness to the sheet model. A solid model generating means for generating a solid model; a solid model defining means for defining a thick solid model; a solid model editing means for editing a solid model by calculation; an interference searching means for searching for model interference; In a CAD / CAM apparatus provided with a developed shape generation means for developing a model and generating a developed shape model, an edit location interference check means for checking an edit location interference of an edited solid model, and an interference of a butted portion. Correction of interference checking means for butted parts to be checked and dimensions when interference occurs A CAD / CAM apparatus, comprising: a dimension correcting unit for correcting the dimension. 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 bent or notched shape, and a method for thickening a sheet model. A solid model generating means for generating a solid model; a solid model defining means for defining a thick solid model; a solid model editing means for editing a solid model by calculation; an interference searching means for searching for model interference; In a CAD / CAM apparatus equipped with a developed shape generating means for developing a model and generating a developed shape model, the bending portion elongation at the time of solid model development is performed by designating a bending method and inputting a plate material, a plate thickness, and a bending angle. CAD / CA characterized by comprising a calculation correcting means for calculating a quantity and correcting a developed shape. M device. Relates 7. Data stored in the solid model information storage unit changes, when it is necessary to change the data includes the steps of defining a new solid model by solid model definition means, the newly defined Existing solid model
A predetermined calculation is performed in relation to the
A step of registering the solid model information storage unit, when the interference portion occurs in defined been solid model, determines whether it is necessary to modify the solid model
And correcting the solid model when it is determined that the solid model needs to be corrected. A method for correcting a solid model of a CAD / CAM apparatus, comprising the steps of: