JP3903819B2 - How to set parent-child relationship of parts - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a part parent-child relation setting method for automatically setting a parent-child relation of parts created using CAD based on the arrangement relation.
[0002]
[Prior art]
In a conventional three-dimensional CAD system, data for specifying the shape of a component is input in units of components, and after the data is input, the components are individually arranged, and finally the mutual relationship between the components (parent and child) (Relation) is set automatically. If this setting is made, the relationship between the parts can be displayed in a tree structure, which brings about the following advantages.
[0003]
If the parent-child relationship of the parts is known, the contact relation between the parts is also known, so that it is possible to automatically check for occurrence of misalignment and forgetting to attach the machining data.
[0004]
If the parent-child relationship of the parts is known, the interference parts can be easily separated when checking interference (especially operation simulation) on the design side.
[0005]
If the parent-child relationship of parts is known, only necessary data can be selected and received on the user side (eg, creator of NC data, creator of small parts).
[0006]
For this reason, the understanding of the parts based on the received data can be deepened quickly. Further, it is possible to shorten the conversion time when converting the data and save the necessary storage area of the storage medium.
[0007]
[Problems to be solved by the invention]
However, in the conventional three-dimensional CAD system, the parent-child relationship is set based on the functional relationship between the components, not the layout relationship between the components. There is a disadvantage that the burden of design becomes large. This is because in a design in which the layout relationship occupies a very important weight, it is necessary to convert the parent-child relationship of the parts bound to the functional relationship into a parent-child relationship based on the layout relationship.
[0008]
For example, as shown in FIG. 13, in the case where the cam drive 15 is attached to the lower head 10 and the cam slide 25 is attached to the upper head 20, the functional relationship between the cam drive 15 and the cam slide 25 is regarded as important. (Because the cam drive 15 slides and moves the cam slide 25 when the upper head 20 is lowered, the positional relationship between the two cams is important considering the function). The parent-child relationship is such that the lower head 10 has no children and the cam slide 25 and the cam drive 15 exist as children of the upper head 20 as shown in the figure.
[0009]
When the parent-child relationship is set based on the functional relationship in this way, for example, when only the position of the cam slide 25 is shifted in the design work, the following problem occurs. As described above, since the cam slide 25 and the cam drive 15 are functionally related to the child of the upper head 20, if the position of the cam slide 25 is shifted in the design work, the position of the cam drive 15 is also shifted accordingly. End up. Therefore, when only the cam slide 25 is shifted, it is necessary to change the parent-child relationship set by the CAD system into a parent-child relationship that matches the actual arrangement relationship. As shown in the figure, the actual arrangement relationship is such that the cam drive 15 exists as a child of the lower head 10 and the cam slide 25 exists as a child of the upper head 20. Re-set the relationship while looking at the drawing. Since the relationship between the cam slide 25 and the cam drive 15 is lost by setting the parent-child relationship, only the cam slide 25 can be shifted.
[0010]
In this way, in the conventional 3D CAD system, the parent-child relationship with emphasis on the function, which is not suitable for the design work, is automatically set. Must be set to. The conversion from the parent-child relationship that emphasizes the functional relationship to the parent-child relationship that emphasizes the arrangement relationship needs to be performed manually while the designer looks at the drawing. If the object of design is a very simple device as in the above example, this conversion work can be completed in a short time without mistakes, but the actual product structure is very complex, so this conversion work is It's hard to do without mistakes.
[0011]
The present invention has been made in view of such conventional problems, and a parent-child relationship of parts that can automatically set a parent-child relationship of parts created using CAD based on the arrangement relation. The purpose is to provide a setting method.
[0012]
[Means for Solving the Problems]
The present invention for solving the above-described problems and achieving the object is achieved by the following method.
[0013]
The method according to claim 1 is a first stage in which the arithmetic device acquires three-dimensional CAD data of a part constituting the machine from a parts database, and the arithmetic device is based on the three-dimensional CAD data acquired by the arithmetic device. A second stage for obtaining a contact surface between components constituting the machine, a third stage for the computing device to determine a movable direction of each component based on the contact surface obtained by the computing device , and one component can be moved while contacting with any other components in the movable direction of said the one in contact with the component part the other part only one der Rutoki, the computing device the other said one component And a fourth step of setting the other part as the “parent” of the one part, and setting the parent-child relationship of the parts.
[0014]
According to a second aspect of the present invention, in the method for setting a parent-child relationship of parts according to the first aspect, a first stage is assumed in which the arithmetic device assumes two parts having a determined parent-child relationship as one part. The arithmetic device further includes a sixth stage in which the processing unit performs the processes of the third stage and the fourth stage for all of the parts.
[0015]
According to a third aspect of the present invention, in the method for setting a parent-child relationship of parts according to the first or second aspect, in the fourth stage, the arithmetic device sets the part to be set as the “parent” as the “parent”. It is characterized in that it is a component that does not come into contact with a component whose volume is larger than that of one component set as a “child”.
[0016]
According to a fourth aspect of the present invention, in the method for setting a parent-child relationship of parts according to the second aspect, the part set as “parent” by the processing from the first stage to the sixth stage by the arithmetic device is moved. Then, a part that moves with the movement, can be drilled for mounting, and a part that comes into contact with the part set as the [parent] is set as the “parent” of the arithmetic unit. The method further includes a seventh step of setting a “child” of the part.
[0017]
According to a fifth aspect of the present invention, in the method for setting a parent-child relationship of parts according to the fourth aspect, there is no part set as “parent” by the processing from the first stage to the sixth stage by the arithmetic unit. In this case, a part that is movable and can be drilled for attachment, and that is in contact with the part set as its [parent], is the part of the part set as the “parent” by the arithmetic unit . The method further includes an eighth stage of setting as a “child”.
[0018]
The method according to claim 6 is the method for setting the parent-child relationship of parts according to claim 5, wherein the parent-child relationship is not determined by the processing from the first stage to the eighth stage by the arithmetic unit. On the other hand, in the ninth stage for checking whether or not there is another part in contact with the part, and when there is another part in contact with the part, the volume of the other part in contact is larger than the volume of the part. On the condition, the arithmetic device further includes a tenth stage in which the component is set as a “child” of another component in contact.
[0019]
【The invention's effect】
As described above, according to the method for setting a parent-child relationship of parts according to the present invention, a parent-child relationship of parts created using CAD can be automatically set based on the arrangement relationship. The conversion from the relationship to the parent-child relationship that places importance on the arrangement relationship does not require the designer to manually perform the conversion operation while looking at the drawing, and can perform a highly reliable conversion operation in a short time.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Exemplary embodiments of a method for setting a parent-child relationship of parts according to the present invention will be described below in detail with reference to the accompanying drawings, taking a three-dimensional structure as an example. FIG. 1 is a schematic configuration diagram of a CAD apparatus capable of carrying out the method according to the present invention.
[0021]
As shown in the figure, the CAD device 100 has an input device 110 for inputting three-dimensional structure data (data relating to parts, including shape data, arrangement data, etc.), and a parts database for storing data relating to the input parts. 120, an arithmetic device 130 that sets the parent-child relationship of the components by executing the method according to the present invention, and a display 140 that displays the calculation result by the arithmetic device 130.
[0022]
2 to 5 are flowcharts for explaining the processing procedure of the method for setting the parent-child relationship of parts according to the present invention. In this flowchart, the element unit constituting the upper die or the lower die of the press device is a single component.
[0023]
First, the arithmetic unit 130 acquires three-dimensional structure data (part three-dimensional CAD data) from the parts database 120 (first stage), and when the press is in the lowest point state (the upper mold is the lower mold). All contact surfaces between parts in a state where it is lowered to the lowest position in accordance with (2nd stage). The contact surface between the parts is obtained by a commonly used algorithm depending on whether or not there is a surface having the same coordinates among a plurality of parts. For example, when attention is paid to two parts 60 and 62 as shown in FIG. 6, the part where the two parts are in contact with each other (the thick line part) is the contact surface (S1).
[0024]
When the press is in the lowest point state, the upper die and the lower die are in mesh with each other, so that it is generally considered that there are no moving parts. However, when there is a moving part even in this state, it is considered that the part is attached to the contacting part. The parts in contact may be one part or a plurality of parts.
[0025]
In order to check the above, the arithmetic unit 130 checks whether or not the part can be moved from the information on the contact surface of each part (third stage). For example, when attention is paid to the part 62 shown in FIG. 6, the part 62 can move in the direction of the solid arrow as shown in FIG. 7, but cannot move in the direction of the dotted arrow. In this step, this is determined using commonly used algorithms. Further, as shown in FIG. 8, although the two components are in contact with each other on one surface, it is determined that the component 80 that can rotate with respect to a certain component can move in the illustrated rotation direction ( S2).
[0026]
When the part is a moving part (S3: YES), the number of parts in contact with the part is checked (S4). If the number of parts to be contacted is one (S5: YES), a parent-child relationship is set as a child of the part that contacts the part (fourth stage). For example, in the case of the component 62 shown in FIG. 6, the component 62 can be moved in the direction of the solid arrow in FIG. Although the component 62 is in contact with two surfaces, the only component in contact is the component 60, so the component 62 is set as a child of the component 60. Further, in the case of the component 82 shown in FIG. 8, the component 82 can be moved in the rotation direction shown in the figure, so that it is determined that the component 82 is a moving component. Since the part 82 is in contact with the part 80, it is set as a child of the part 80 (S6).
[0027]
On the other hand, when it is determined that the part is not a moving part at step S3 (S3: NO), or when it is determined at step S5 that there is no part to be contacted or a plurality of parts are in contact (S5: NO) ) Since the parent-child relationship cannot be set at this time, the processing for the next part is performed.
[0028]
The processes from S2 to S6 are performed for all parts included in the three-dimensional structure data. Therefore, the parent-child relationship for at least two parts is set by the processing so far.
[0029]
Next, the arithmetic unit 130 performs processing for considering the parts for which the parent-child relationship is set as one part (fifth stage) (S7). It is examined whether or not the part moves from the information on the contact surface of the part considered as one part. This process is substantially the same as the process of S2 (S8). If the part considered as one part is a moving part, the number of parts that come into contact with the part is checked (S9). If the number of parts in contact is one (S10: YES), a parent-child relationship is set as a child of the part in contact with that part (sixth stage) (S11). Through the above process, the parts for which the parent-child relationship is set are further considered as one part (S12). If there are a plurality of parts in contact (S10: NO), the parent-child relationship cannot be set at this time, so the process for the next part is performed.
[0030]
The above processing from S9 to S12 is performed for all the parts for which the parent-child relationship is set by the processing from S2 to S6. For example, considering a work having a structure as shown in FIG. 9, the parent-child relationship is set as follows in the processing from S1 to S12.
[0031]
This work is composed of four parts 90, 91, 92 and 93. In the process of step S1, a contact surface between the component 90 and the component 91, a contact surface between the component 90 and the component 93, and a contact surface between the component 91 and the component 92 are obtained. In the process of step S2, it is understood from the information on these contact surfaces that the four parts 90, 91, 92, 93 are all moving parts. In the processes of S4 and S5, it is determined whether or not there is one component that comes into contact. Since there are a plurality of parts 90 and 91 that are in contact with each other, the parent-child relationship is not set. Since the part 92 and the part 93 are in contact with each other, the part 93 is set as a child of the part 90 and the part 92 is set as a child of the part 91 in the process of step S6. Next, in the process of step S7, the component 90 and the component 93 are considered as one component, and the component 91 and the component 92 are considered as one component. In the processing of steps S8 to S12, since there is no contact surface between the component 90 and the component 93 considered as one component, no further processing is performed, but with the component 91 considered as one component. The component 92 has a surface that contacts the component 90, and the component 91 and the component 92 that are considered as one component based on the information on the contact surface can move with respect to the component 90, and the component that contacts is the component 90. Therefore, the parts 91 and 92 considered as one part are set as children of the part 90. Therefore, in the processing so far, the parts 90 and 93 are in a parent-child relationship, similarly, the parts 90 and 91 are in a parent-child relationship, and the parts 91 and 92 are in a parent-child relationship. The parent-child relationship of parts is set.
[0032]
Next, the arithmetic device 130 determines which of the components having the parent-child relationship set as described above should be the parent. This is a process of finding a part that does not come into contact with a moving part that is larger than its own part and using it as a parent. That is, a part that satisfies the condition that it is the largest part in volume among moving parts and that the part is not in contact with a part larger than the part is a parent. In the example of FIG. 9, the part 90 has the largest volume among the parts constituting the work and is not in contact with a part larger than the part 90, so the part 90 is the parent in the work. .
Accordingly, the structure is such that the component 90 is a parent, the components 91 and 93 are children, and the component 92 is a child of the component 91. This structure is a structure in accordance with the arrangement relationship of the parts (S13).
[0033]
With the above processing, the parent-child relationship of the parts is determined. Up to this point, it is assumed that the press is at the lowest point (the upper die is aligned with the lower die and lowered to the lowest). The relationship has been decided. Therefore, it is possible that the determined parent-child relationship is not maintained when the upper die of the press is raised. Therefore, whether or not this is maintained is confirmed by the following processing.
[0034]
First, in a state where the upper die of the press is raised, it is checked whether or not the part determined as the child by the above processing comes into contact with the parent of the child (S14). If it is in contact (S15: YES), it is examined whether or not the mounting hole can be formed in the child component (S16). If drilling is possible (S17: YES), the child part (own part) is determined to be a child of the parent part that comes into contact with the own part (S18). If the part determined as the child does not come into contact with the parent of the child in the state where the upper die of the press is raised (S15: NO), the next part is processed. The above processing is performed on all the child parts that move together with the parent part (seventh stage).
[0035]
In the above processing, when a part determined as a parent is moved on the CAD, a child part that can move with the part can be attached to the parent using a bolt or the like. Therefore, the parent-child relationship is almost unmistakable, and the parent-child relationship is being determined. In the case of a press die structure, parts are preferentially attached to a fixed die (fixed die) in order to guarantee press accuracy. Therefore, it is desirable that the above processing be performed in the order of the fixed type (the one with the smallest Z coordinate value on the bottom surface) to the movable type (the one with the largest Z coordinate value on the bottom surface).
[0036]
For those in which the parent-child relationship has not been determined in the above processing, it is further checked whether or not there is a child part that starts to move (moves) when there is no parent part (S19). If there is a child part that moves, it is checked whether or not the attachment part can be drilled in the child part (S20). If drilling is possible (S21: YES), the child part (own part) is determined to be a child of the determined parent part (S22). If the hole cannot be drilled in the child part (S21: NO), the next part is processed. The above processing is performed for all child parts that move with the parent part (eighth stage).
[0037]
Next, the computing device 130 performs processing for considering the components for which the parent-child relationship is determined as one component, similarly to the processing in step S7 (S23). Then, when there is no parent part considered as one part, it is checked whether or not there is a child part that newly moves together with the parent part (S24). If there is a child part that moves, it is checked whether or not the child part is determined as a child of another part (S25). If there is a part that has not been confirmed (S26: YES), the presence / absence of a part that contacts the part that has not been confirmed is checked (step 9) (S27). If there are other parts that come into contact (S28: YES), the size of the part that comes into contact with the unconfirmed part (own part) is checked (S29). If the parts to be contacted are small (S30: YES), and if there are no other parts to be contacted (S28: NO), the parent-child relationship in which the self part is a child of the contacting part in the parent part is determined. (Tenth stage) (S31). If there is a child part that moves, the child part is not confirmed as a child of another part (S26: NO), or the part that is in contact with the unconfirmed part (own part) is not small. (S30: NO), the next component is processed. The process in which the parent-child relationship is determined by the above processing is considered as one component (S32). Then, those whose parent-child relationship is confirmed are removed, and the above processing is repeated for those whose parent-child relationship is not confirmed (S33).
[0038]
When the above processing is applied to CAD data as shown in FIG. 10, in the conventional case in which a parent-child relationship is created with an emphasis on the functional relationship, the modeling structure is PUNCH as a parent and INSERT as its child. And prc-assy. However, according to the method of the present invention that places importance on the relationship of the head position, a relationship is generated in which PUNCH is a parent, INSERT and B / DIE1 are children thereof, and B / DIE2 is a child of INSERT.
[0039]
When applied to CAD data as shown in FIG. 11, in the conventional case, the modeling structure is such that UPR-H is a parent and CAM-S and prc-assy are children. End up. However, according to the method of the present invention, UPR-H is a parent, its children are CAM-S and PRCR1, further, CAM-S children are PRCR2 and PRCR3, and PRCR2 children are PRCP2 and PRCR3. A relationship is generated in which PRCP3 is a child of each and PRCP1 is a child of PRCR1.
[0040]
As described above, according to the method of the present invention, the correct parent-child relationship based on the arrangement relationship is displayed from the CAD data, and the operator can perform an efficient design work based on this display.
[0041]
The method according to the present invention will be verified with reference to FIG. The numbers (1) to (7) in the figure indicate the time when the parent-child relationship is established between the components. (1) indicates that the parent-child relationship is determined when the above steps S1 to S6 are processed, and (2) indicates that the parent-child relationship is determined when the steps S7 to S12 are further processed. 3 is the one where the parent-child relationship is established when the processing of step S13 is further performed, 4 is the one where the parent-child relationship is confirmed when the processing of steps S14 to S18 is further performed, and Further, when the processing of steps S19 to S33 is completed, the parent-child relationship is determined. (6) is the determination of the parent-child relationship when the processing of steps S1 to S33 is performed again. The parent-child relationship is determined when the processing of steps S1 to S33 is performed once again.
[0042]
These processes are summarized as follows. (1) is processing in which a movable part in contact with one part is a child of the part in contact. In (2), a part having a parent-child relationship determined is considered as one part, and for a part in contact with a part for which this parent-child relationship has been determined, a parent-child relationship is determined between these parts. In (3), a movable part that does not contact a part having a larger volume than that part is determined as a parent. (4) is a part that starts to move when the part determined as the parent is moved, and that can be drilled for mounting is determined as a child of the parent. (5) is a part that is determined to have a parent-child relationship determined as one part, and starts moving when this part is moved, and the part is in contact with a part that is not in contact with another part that has a larger volume than that part. Establish relationships. In (6), except for those in which the parent-child relationship is confirmed, the processes (1) to (5) are repeated to determine the parent-child relationship. In step (7), step (6) is repeated once more.
[0043]
For example, the parent-child relationship between the component 1201 and the component 1202 is determined only by the processing of S1 to S6. The component 1201 and the component 1202 are in contact at three contact surfaces. Since the part 1202 can move in the left direction of the drawing and only one part 1201 is in contact with the part 1202, the part 1202 is defined as a “child” of the part 1201. In other words, the movable part that is in contact with one part can determine the parent-child relationship by processing (1) for making it a child of the part in contact.
[0044]
Further, the parent-child relationship between the component 1201 and the component 1203 cannot be determined only by the processing of S1 to S6, and is further determined by performing the processing of S7 to S12. The component 1201 and the component 1203 are in contact with each other on one surface. The part 1203 can move in the horizontal direction of the drawing. However, since the part 1203 is in contact with not only the part 1201 but also the part 1204, the part 1203 is a “child” of the part 1201, and the part 1204 is a part. Set to “child” of 1203. In other words, the movable part that is in contact with one part is considered to be a part that has been determined to be a child of the part that is in contact (1) and the parent-child relationship is determined, and this parent-child relationship has been determined. With respect to the parts in contact with the parts, the parent-child relationship can be determined by the process (2) for determining the parent-child relationship between these components.
[0045]
As described above, according to the parent-child relationship setting method for parts according to the present invention, the parent-child relation of parts created using CAD can be automatically set based on the arrangement relation.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a CAD apparatus capable of performing a method according to the present invention.
FIG. 2 is a flowchart showing a processing procedure of a method according to the present invention.
FIG. 3 is a flowchart showing a processing procedure of a method according to the present invention.
FIG. 4 is a flowchart showing a processing procedure of a method according to the present invention.
FIG. 5 is a flowchart showing a processing procedure of a method according to the present invention.
FIG. 6 is a diagram for explaining a processing procedure of a method according to the present invention.
FIG. 7 is a diagram for explaining a processing procedure of a method according to the present invention.
FIG. 8 is a diagram for explaining a processing procedure of a method according to the present invention.
FIG. 9 is a diagram for explaining a processing procedure of a method according to the present invention.
FIG. 10 is a diagram for explaining a difference between a parent-child relationship using a conventional method and a parent-child relationship using a method according to the present invention.
FIG. 11 is a diagram for explaining a difference between a parent-child relationship using a conventional method and a parent-child relationship using a method according to the present invention.
FIG. 12 is a diagram for explaining how a parent-child relationship is determined when the method according to the present invention is applied to a press apparatus;
FIG. 13 is a diagram for explaining how a parent-child relationship is determined by a conventional method.
[Explanation of symbols]
100 ... CAD device,
110 ... input device,
120 ... parts database,
130 ... arithmetic device,
140. Display.

Claims (6)

A first stage in which the arithmetic device acquires the three-dimensional CAD data of the parts constituting the machine from the parts database ;
A second stage in which the arithmetic device obtains a contact surface between components constituting the machine based on the three-dimensional CAD data acquired by the arithmetic device ;
A third stage in which the arithmetic device determines the movable direction of each component based on the contact surface determined by the arithmetic device ;
One component can be moved while in contact with other components to one of the movable directions, wherein the one contacting the component part the other part only one der Rutoki, the computing device is the one component And setting the other part as the “parent” of the one part, and setting the other part as the “parent” of the one part;
A method for setting a parent-child relationship between parts. A fifth stage in which the computing device assumes two parts with a determined parent-child relationship as one part;
A sixth stage in which the arithmetic unit performs the processes of the third stage and the fourth stage with respect to all assumed one parts;
The part-parent-child relationship setting method according to claim 1, further comprising: In the fourth stage, the arithmetic unit sets the component set as the “parent” as a component that does not come into contact with a component having a larger volume than the one component set as the “child”. The parent-child relationship setting method for parts according to claim 1 or 2. When the part set as the “parent” is moved by the processing from the first stage to the sixth stage by the arithmetic device , the part moves along with the movement and can be drilled for mounting. 3. The method according to claim 2, further comprising: a seventh step in which the arithmetic device sets a part that contacts the part set as the [parent] as a “child” of the part set as the “parent”. The parent-child relationship setting method for parts described in 1. If there is no part set as the “parent” by the processing from the first stage to the sixth stage by the arithmetic unit, it is a movable part and can be drilled for mounting. 5. The eighth step according to claim 4, further comprising an eighth stage in which the computing device sets a part that is in contact with a part set as a “parent” as a “child” of the part set as the “parent”. How to set parent-child relationship of parts. A ninth stage for examining whether there is another part in contact with the part for which the parent-child relationship has not been determined by the processing from the first stage to the eighth stage by the arithmetic unit ; When there is another part that comes in contact with the part, the arithmetic unit will place the part as a “child” of the other part that makes contact, provided that the volume of the other part in contact is larger than the volume of the part. The method according to claim 5, further comprising: a tenth step.

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