CN108804782A - The associated three-dimensional process model change of feature based and maintaining method - Google Patents
The associated three-dimensional process model change of feature based and maintaining method Download PDFInfo
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Abstract
The present invention relates to a kind of change of three-dimensional process model and maintaining method, the associated three-dimensional process model change of especially a kind of feature based and maintaining method.By establishing the Design Structure Model in process route between each machining feature, possible machining feature propagation path is analyzed.Using analysis gained path as core, structured storage is carried out to information such as possible impacted machining feature, the affiliated process models of machining feature.The process model information of each process in combined process route proposes addition, deletion, the process model change of modification and processing feature and maintenance algorithm.Finally, the feasibility and reasonability of three-dimensional process model change and maintaining method are illustrated with example.Its object is to improve the reliability of the flexibility and change result of three-dimensional process model change.
Description
Technical field
The present invention relates to a kind of change of three-dimensional process model and maintaining method, especially a kind of feature baseds associated three
Tie up the change of process model and maintaining method.
Background technology
Process model change propagation refers to after modifying to a certain process model, and the change of the process model can travel to
Subsequent handling model.Process model is mainly made of machining feature and technique markup information, and the basis of technique mark is that processing is special
Sign.Therefore, the essence of process model change is the change of machining feature.The propagation of process model change shows as machining feature and repaiies
After changing, the change of the modification of the machining feature and the related machining feature dependent on the machining feature in subsequent handling model.It borrows
Help the basic thought of feature association method, if it is possible to predict possible machining feature variation transmission path, and by all roads
Diameter and process Model Independent store, when the change of process model may be implemented there are many change scheme realize related machining feature i.e. its
Affiliated process model variation, ensures related machining feature i.e. its affiliated process model integrity and reasonability.Meanwhile alternative routing
It is stored respectively with process model, when change failure occurs for process model, subsequent handling model will not be had an impact, be avoided big
Scale process model fails.
A kind of associated three-dimensional process model change of feature based and maintaining method are Siemens NX, Dassault
CATIA etc. provides associated modeling pattern between component, allows to establish feature association across component in modeling process, such as follow-up work
During sequence model foundation, preposition process model is copied first, forms copy feature, which closes with preposition process model
Connection, when preposition process model changes, which can also change.By being associated between component, between process model
Character chain is formed, if some feature in character chain changes, CAD/CAM system will be updated character chain.Across portion
The use of part feature association effectively improves the success rate and efficiency that each process model changes in process route.But use component
Between feature association method to modeling skills, more stringent requirements are proposed, and after a certain process model is unloaded or replaces, it is necessary to
Otherwise reconstruction parameter chain will cause entire process route to fail.This method another disadvantage is that character chain is fixed, lead to work
When sequence model is changed, impacted machining feature can only be updated according to character chain, and changing mode is single.
A kind of associated three-dimensional process model change of feature based and maintaining method are that current mainstream CAD/CAM system is more
Using feature modeling mode, by state modulator feature, feature is combined to form threedimensional model.In building for machining sequence model
Mold process is also in compliance with this process.Due to the difference of modeling pattern, the feature for including in process model is suitable according to the priority of foundation
Sequence forms tree, and there are problems to be for the prior art：1, when the Parameters variation that root node feature includes exceeds allowable range,
Be easy to cause process model modification failure, 2, for multiple features structure complicated procedures of forming model, it is this update unsuccessfully often not
It is predictable, the negative consequence with bigger；3, when existing characteristics association, the variation of parameter between the process model in process route
It may be propagated further in the process model in process route, more process model modifications is caused to fail.Therefore how
Data are safeguarded in time during the change of three-dimensional machining sequence model, improve flexibility and the change of three-dimensional process model change
The reliability of more result is a problem to be solved.
Invention content
The present invention provides a kind of associated three-dimensional process model change of feature based and maintaining method, purpose be gram
The problem of three-dimensional machining sequence model data maintenance difficulty during change of clothes, improve the flexibility of three-dimensional process model change with
Change the reliability of result.
In order to reach the purpose of the present invention, technical solution provided by the invention is：A kind of associated three-dimensional work of feature based
Sequence model changes and maintaining method, includes the following steps：
1) analysis procedure model change propagation path：
A) machining feature incidence relation between analysis procedure establishes process model design for change structure matrix (DSM)：
Process model change (DSM) is defined as：One digraph G=(V, E), wherein V are non-empty vertex sets, and E is that have
To line set, and side e corresponds to orderly vertex to (vi, vj), using machining feature as the vertex set V of G, the pass between machining feature
Connection relationship is exactly the DSM of process model change as oriented line set E, then the adjacency matrix A of G；
B) DSM is clustered；
B-1 the reachability matrix P of the adjacency matrix of G) is calculated；
B-2 it) reorders to DSM：By vertex to (vj, vi), i=i1, i2..., ilBe divided into same sub-block to get to
The cluster matrix M of DSM；
C) DSM cluster results are analyzed, process model change propagation path is obtained；
2) the process change propagation model for including machining feature incidence relation is established, processing is special when record process change occurs
The variation path of sign and coverage；
3) on the basis of process change propagation model, three-dimensional process model information modeling is carried out：
Process change will 3-1) be added to comprising the other informations such as technique markup information and not changed machining feature
Propagation model.
3-2) establish the institutional framework of three-dimensional process model information.By the three-dimensional process model information in process route according to
The structure carries out organizational norms, in conjunction with change propagation model, forms the basic of three-dimensional machining sequence model change propagation and maintenance
Information source.
4) according to three-dimensional process model information and change propagation model, three-dimensional process model change is carried out：Including such as
Under machining feature：
A) modification and processing feature：The machining feature that need to be changed is found in change propagation model first, determines its association
Subgraph determines its machining feature relied on then according to the incidence relation between machining feature, after modification and processing feature, according to work
The change of sequence model information, more new process model；
B) machining feature is deleted：It is associated with the position in subgraph in machining feature according to machining feature is deleted, deletes follow-up add
Work feature.
C) machining feature is added：New machining feature is added in process route.
In above-mentioned steps (4)-(b), the processing for deleting following process feature is that front and back machining feature is reconnected after deleting.
In above-mentioned steps (4)-(b), the processing for deleting following process feature is to delete follow-up all machining features.
Cause certain process model identical as front and continued process model after deleting processing, then needs to delete the process model.
In above-mentioned steps (4)-(c), new machining feature is to have an impact to following process feature, then returns new machining feature
Belong to the process model or its front and continued processing model belonging to impacted machining feature.
In above-mentioned steps (4)-(c), new machining feature is to belong in new machining feature without influence on following process feature
In terms of three-dimensional process model, this machining feature is added to Arbitrary 3 D process model.
Above-mentioned new machining feature is added in the process model for having similar features.
The beneficial effects of the invention are as follows：
1, the present invention sets about from the machining feature in process route, is become based on DSM cluster analysis machining features
The possible path and coverage more propagated.Establish change propagation model record machining feature incidence relation and with process model
Correspondence.The process model information institutional framework suitable for change propagation model is established, group is carried out to process model information
Knit management.The countermeasure for studying different type change source, realizes three-dimensional machining sequence model change propagation and safeguards, relatively passes
The method of system has certain reliability and superiority.
2, the present invention can search possible impacted machining feature according to change propagation model, select change propagation road
Diameter improves the diversity of process model change；Change propagation model uses structured storage, and alternative routing information can inherit, can
It replaces, ensures the reliability of new change propagation model after add or delete machining feature；Change propagation model individually builds and deposits
Storage, for by compared with multi-process model group at process route, change propagation model can be extended and keep smaller scale,
Facilitate management.
Description of the drawings
Fig. 1 process models change；
Fig. 2 process models change DSM；
Fig. 3 DSM cluster results；
Associated diagram between Fig. 4 features；
The basic structure of Fig. 5 change propagation models；
Fig. 6 three-dimensional process model information institutional frameworks；
Fig. 7 initial manufacture process models；
Process model after Fig. 8 modification and processing features；
Process model after the related machining feature of Fig. 9 modifications；
Figure 10 deletes the process model after machining feature；
Figure 11 adds the process model after machining feature.
Specific implementation mode
The method of the present invention is described further with reference to the accompanying drawings and examples.
Embodiment：Herein by taking part process shown in FIG. 1 as an example, above-mentioned machining feature variation is carried out effective
Property verification.The Three-dimension process process model of the part is as shown in Figure 7.
Technical solution provided by the invention is：By establishing the Design Structure Model in process route between each machining feature,
Analyze possible machining feature propagation path.It is special to possible impacted machining feature, processing using analysis gained path as core
The information such as process model belonging to sign carry out structured storage.The process model information of each process, proposes to add in combined process route
Add, delete, the process model of modification and processing feature changes and maintenance algorithm.It specifically comprises the following steps：
(1) analysis procedure model change propagation path.
(a) machining feature incidence relation between analysis procedure establishes process model design for change structure matrix (DSM), such as Fig. 2
It is shown.Process model change (DSM) is defined as：One digraph G=(V, E), wherein V are non-empty vertex sets, and E is directed edge
Set, and side e corresponds to orderly vertex to (vi, vj).Consider the directionality that process mould processing changing features are propagated, processing is special
The vertex set V as G is levied, the incidence relation between machining feature is as oriented line set E, then the adjacency matrix A of G is exactly process
The DSM of model change.
(b) DSM is clustered.
(b-1) the reachability matrix P of the adjacency matrix of G is calculated.
(b-2) it reorders to DSM.The main purpose to reorder is by vertex to (vj, vi), i=i1, i2..., ilIt draws
Same sub-block is assigned to get to the cluster matrix M of DSM.Sort method is：
Step1. initial matrix M=A is set.
Step2. if the column vector p of Pr≠ 0, search nonzero element psrIf s ≠ r, it is s by s sequential storages, enables pr
=0.
Step3. column vector p is investigateds, if there is nonzero element pts≠ 0, and s then is added to by t to arbitrary s, t ≠ s,
Enable ps=0.
Step4. it reorders to the column vector of M, by mr,msIt adjusts to tail of sequence.
Step5. it reorders to the row vector of M, by mr T、ms TIt adjusts to tail of sequence.
Step6. if there are column vector p in Pr≠ 0, turn step2；Otherwise, algorithm terminates.
(c) DSM cluster results as shown in Figure 3 are analyzed, several unrelated machining feature incidence relation such as Fig. 4 are obtained, are marked
Show that the possibility of machining feature change influences path and coverage to get to process model change propagation path.
(2) the process change propagation model for including machining feature incidence relation is established, record process change is processed when occurring
The variation path of feature and coverage instruct the increase, deletion, modification operation of machining feature, the base of change propagation model
This structure is as shown in Figure 5.
(3) on the basis of process change propagation model, three-dimensional process model information modeling (such as Fig. 6) is carried out, including work
The other informations such as skill markup information and not changed machining feature.
(3-1) establishes the institutional framework of three-dimensional process model information.Three-dimensional process model information in process route is pressed
Organizational norms are carried out according to the structure, in conjunction with change propagation model, form the base of three-dimensional machining sequence model change propagation and maintenance
This information source.
(4) according to three-dimensional process model information and change propagation model, three-dimensional process model change is carried out.Three-dimensional process mould
The change of type further includes addition, deletion, the three-dimensional process model of modification.
(a) modification and processing feature：The machining feature that need to be changed is found in change propagation model first, determines its association
Subgraph.Then according to the incidence relation between machining feature, its machining feature relied on is determined.After modification and processing feature, foundation
The change of process model information, more new process model.Process model such as Fig. 8 after modification and processing feature, shown in 9.
Method is (algorithm 2)：
Step1. process model i is opened, is modified to machining feature k.
Step2. the machining feature k that modification is searched in change propagation model determines its affiliated machining feature association subgraph
Path number.
Step3. according to incidence relation between the machining feature of path number record, determine that n dependent on machining feature k add
Work feature.
Step4. it after modification and processing feature k, re-establishes the process model information of process model i and believes with former process model
Breath is compared, and different information (not including technique to mark) is added to machining feature array to be modified.Replicate processing to be modified
I+1 after feature to process model i, a process model informations of i+2 ... ..., and more new process model.
Step5. jth (1≤j≤n) a machining feature of update dependent on machining feature k turns if j < n, enable k=j
step4。
(b) deletion machining feature is associated with the position in subgraph in machining feature according to machining feature is deleted, deletes follow-up add
The processing of work feature can be divided into：Front and back machining feature is reconnected after deletion and deletes follow-up two kinds of sides of all machining features
Formula.If causing certain process model identical as front and continued process model after deleting processing, i.e., there is no new processing is special for the process model
Sign, then need to delete the process model.The process model deleted after machining feature is as shown in Figure 10.
Method is (algorithm 3):
Step1. process model is opened, machining feature k is deleted.
Step2. machining feature k to be deleted is searched in change propagation model, determines its affiliated machining feature association subgraph
Path number.
Step3. machining feature array to be deleted is established, the signature identification of machining feature to be deleted and affiliated process mould are recorded
The process title of type.
If Step4. only deleting machining feature k, according to the machining feature incidence relation that path number records, update depends on
The machining feature memory node of machining feature k is to rebuild change propagation model structure.Update the kth+1 after machining feature k, k+
2 ... ... a machining features safeguard process model using algorithm 2.
Step5. according to incidence relation between machining feature in path number, all processing dependent on machining feature k are searched
Feature stores its information to machining feature array to be deleted.
Step6. the machining feature of machining feature array record to be deleted is deleted in change propagation model.
Step7. the affiliated process model information of machining feature to be deleted recorded according to machining feature array to be deleted is opened
Corresponding process model, and delete the machining feature information in process model information.
Step8. judge to delete technique in the affiliated process model information of machining feature to be deleted that machining feature array records
Whether it is empty under mark node, if it is sky, deletes the process model.
(c) machining feature is added：New machining feature is added in process route, is divided into and having an impact to following process feature
With without influencing two classes.In terms of new machining feature belongs to three-dimensional process model, if new machining feature be to following process feature without
This machining feature is then added to Arbitrary 3 D process model by effect characteristics.Consider processing efficiency and economy, preferentially will newly add
Work feature is added in the process model for having similar features.If new machining feature influences to continue machining feature, by new machining feature
Belong to the process model or its front and continued processing model belonging to impacted machining feature.Add the process model after machining feature
As shown in figure 11.
Method is (algorithm 4):
Step1. the machining feature type attribute under change propagation model interior joint is traversed, if in the presence of special with processing to be added
The machining feature for levying k same types, turns step2, otherwise enters step3.
Step2. in the machining feature set of machining feature same type to be added choose a machining feature, be denoted as plus
Work feature.Its corresponding process name attribute, i.e. process model residing for the machining feature are obtained, process model i is denoted as.To really
The fixed affiliated process model of machining feature to be added, turns step4.
Step3. according to technological design basic principle, dependence process mould of a certain process model as new machining feature is chosen
Type is denoted as process model i.Dependence process mould of the process model as new machining feature can also be created in process model tail portion
Type.
Step4. the incidence relation of new addition machining feature k and each machining feature in change propagation model are investigated.If processing
Feature k is in the tail portion of a certain machining feature association subgraph, then new under the node that respective path is numbered in change propagation model
Machining feature k relevant informations are built, and incidence relation is established using memory node attribute.If machining feature k is in a certain processing spy
In sign association subgraph, then machining feature k relevant informations are created under the node that respective path is numbered in change propagation model, and more
The new machining feature memory node dependent on machining feature k is to rebuild change propagation model structure.
If Step5. creating process model, turn step9.
Step6. according to incidence relation between the machining feature of path number record, determine that n dependent on machining feature k add
Work feature.
Step7. newly after addition (modification) machining feature k, re-establish the process model information of process model i and with former work
Sequence model information is compared, and different information (not including technique to mark) is added to machining feature array to be modified.Duplication is repaiied
I+1 after the machining feature changed to process model i, a process model informations of i+2 ... ..., and more new process model.
Step8. jth (1≤j≤n) a machining feature of update dependent on machining feature k turns if j < n, enable k=j
step7。
Step9. the last one process model and information in process route are copied, more new process title simultaneously deletes processing spy
Levy technique markup information all under node.New addition processing characteristics information is added to the process mould processing characteristic node
Under.
Claims (7)
1. a kind of associated three-dimensional process model change of feature based and maintaining method, it is characterised in that：Include the following steps：
1) analysis procedure model change propagation path：
A) machining feature incidence relation between analysis procedure establishes process model design for change structure matrix (DSM)：
Process model change (DSM) is defined as：One digraph G=(V, E), wherein V are non-empty vertex sets, and E is directed edge
Set, and side e corresponds to orderly vertex to (vi, vj), using machining feature as the vertex set V of G, the association between machining feature is closed
System is used as oriented line set E, then the adjacency matrix A of G is exactly the DSM of process model change；
B) DSM is clustered；
B-1 the reachability matrix P of the adjacency matrix of G) is calculated；
B-2 it) reorders to DSM：By vertex to (vj, vi), i=i1, i2..., ilSame sub-block is divided into get to DSM
Cluster matrix M；
C) DSM cluster results are analyzed, process model change propagation path is obtained；
2) the process change propagation model for including machining feature incidence relation is established, machining feature when record process change occurs
Change path and coverage；
3) on the basis of process change propagation model, three-dimensional process model information modeling is carried out：
Process change propagation 3-1) will be added to comprising the other informations such as technique markup information and not changed machining feature
Model.
3-2) establish the institutional framework of three-dimensional process model information.By the three-dimensional process model information in process route according to the knot
Structure carries out organizational norms, in conjunction with change propagation model, forms the essential information of three-dimensional machining sequence model change propagation and maintenance
Source；
4) according to three-dimensional process model information and change propagation model, three-dimensional process model change is carried out：Including following
Machining feature.
A) modification and processing feature：The machining feature that need to be changed is found in change propagation model first, determines that it is associated with subgraph
Then according to the incidence relation between machining feature, its machining feature relied on is determined, after modification and processing feature, according to process mould
The change of type information, more new process model；
B) machining feature is deleted：It is associated with the position in subgraph in machining feature according to machining feature is deleted, it is special to delete following process
Sign.
C) machining feature is added：New machining feature is added in process route.
2. a kind of associated three-dimensional process model change of feature based according to claim 1 and maintaining method, feature
It is：In above-mentioned steps (4)-(b), the processing for deleting following process feature is that front and back machining feature is reconnected after deleting.
3. a kind of associated three-dimensional process model change of feature based according to claim 1 and maintaining method, feature
It is：In above-mentioned steps (4)-(b), the processing for deleting following process feature is to delete follow-up all machining features.
4. a kind of associated three-dimensional process model change of feature based according to claim 2 or 3 and maintaining method, special
Sign is：Cause certain process model identical as front and continued process model after deleting processing, then needs to delete the process model.
5. a kind of associated three-dimensional process model change of feature based according to claim 4 and maintaining method, feature
It is：In above-mentioned steps (4)-(c), new machining feature is to have an impact to following process feature, then belongs to new machining feature
Process model belonging to impacted machining feature or its front and continued processing model.
6. a kind of associated three-dimensional process model change of feature based according to claim 4 and maintaining method, feature
It is：In above-mentioned steps (4)-(c), new machining feature is on following process feature without influence, belongs to three in new machining feature
In terms of tieing up process model, this machining feature is added to Arbitrary 3 D process model.
7. a kind of associated three-dimensional process model change of feature based according to claim 6 and maintaining method, feature
It is：Above-mentioned new machining feature is added in the process model for having similar features.
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| CN114895885A (en) * | 2022-05-20 | 2022-08-12 | 杭州宏深科技有限公司 | Feature-based recalculation method for three-dimensional detection software |
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| CN107330179A (en) * | 2017-06-26 | 2017-11-07 | 江苏科技大学 | A kind of three-dimensional process model Method of Creation Process containing technique supplemental characteristic |
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| JP2014089530A (en) * | 2012-10-29 | 2014-05-15 | Azapa Co Ltd | Model analysis support program and model analysis support device |
| CN106960088A (en) * | 2017-03-13 | 2017-07-18 | 西北工业大学 | The three-dimensional process model automatic update method changed towards process |
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| CN114895885B (en) * | 2022-05-20 | 2023-08-15 | 杭州宏深科技有限公司 | Feature-based recalculation method in three-dimensional detection software |
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