CN105205278B - The detachable direction automatic judging method of part in engineering goods assembling model - Google Patents
The detachable direction automatic judging method of part in engineering goods assembling model Download PDFInfo
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- CN105205278B CN105205278B CN201510650480.0A CN201510650480A CN105205278B CN 105205278 B CN105205278 B CN 105205278B CN 201510650480 A CN201510650480 A CN 201510650480A CN 105205278 B CN105205278 B CN 105205278B
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Abstract
The invention discloses a kind of detachable direction automatic judging methods for the part in engineering goods assembling model, which is characterized in that includes the following steps：Step 1：If there are active constraint relationship, the parts to be disassembled for part, judge to terminate；Step 2：If any restriction relation is not present in part, detachable direction Candidate Set is established with 6 axial directions of coordinate system, goes to step four；Step 3：If there is only passive bound relationships for part, according to the type of passive bound relationship, calculates and establish detachable direction Candidate Set；Step 4：The disassembly direction that can be collided is deleted from detachable direction Candidate Set, remaining direction is the detachable direction of the part.The present invention, come the detachable direction of automatic decision part, has the characteristics that be easy to implement, be concisely and efficiently according to assembly restriction.Present invention could apply to the software systems such as product virtual dismounting emulation, assembly sequence-planning, improve the intelligent of these systems.
Description
Technical field
The present invention relates to a kind of detachable direction automatic judging method of the part for engineering goods assembling model, this hairs
It is bright to belong to CAD and engineering goods virtually dismounting and assembly simulation field.
Background technology
In recent years, with the development of cad technique, computer technology and emulation technology, many Machine Designs, manufacture and production
Enterprise to Design of digital, the displaying of product virtual Assembly And Disassembly process, the assembly sequence-planning based on digitalized artificial technology,
The technologies such as engineering goods digitlization evaluation are increasingly paid attention to.The application of these technologies will largely facilitate enterprise and improve product
Quality shortens the design, research and development and manufacturing cycle of product, reduces production cost.So using these technologies, application or exploitation
The Products Digitals such as the machine ＆ equipment of product and display systems, product virtual assembly sequence-planning system or digitlization review system
System becomes the active demand of current many enterprises.In the development process of these systems, for Products Digital assembling model
The detachability of part and the judgment method in detachable direction be important one of technology, it can be the disassembly process of user
Or assembly sequence-planning provides convenient, effective navigation feature, to improve the intelligent of application system.
But due to engineering goods, especially big machinery product numerous, complicated characteristic, realization with part
The automatization judgement in the detachability of the part of Products Digital assembling model and detachable direction is always one extremely difficult
Work.Current many commercial softwares do not support the automatization judgement of the detachability and detachable direction of part, or only
Provide semi-automatic arbitration functions.
Invention content
To solve the deficiencies in the prior art, the purpose of the present invention is to provide the parts in a kind of engineering goods assembling model
Detachable direction automatic judging method, the assembly of existing product virtual and displaying, product virtual assembly sequence can be improved
The related softwares such as planning system it is intelligent.
In order to realize that above-mentioned target, the present invention adopt the following technical scheme that：
A kind of detachable direction automatic judging method of part in engineering goods assembling model, which is characterized in that for
Any one part A in assembling model to be removed includes the following steps according to the restriction relation between part：
Step 1：If part A exists to the active constraint relationships of other parts in assembling model, part A can not be by
Dismounting, judges to terminate；
Step 2：If the active constraint relationship to other parts in assembling model had both been not present in part A, phase is also not present
For the passive bound relationship of other parts in assembling model, then zero is established with 6 axial directions of 3 reference axis of assembling coordinate system
The detachable direction collection S of candidate of part A, goes to step four；
Step 3：If part A is not present to the active constraint relationships of other parts in assembling model, but exist relative to
The passive bound relationship of other parts in assembling model then calculates the removable of part A according to the type of each passive bound relationship
Direction is unloaded, and the detachable direction collection S of the candidate for establishing part A；
Step 4：The candidate detachable direction D of each of detachable direction Candidate Set S for part A, to the edges part A
Candidate detachable direction D does collision detection, if part A collides with the other parts in assembling model, from detachable
Candidate detachable direction D is deleted in the Candidate Set S of direction.The step is repeated, until all candidates can in detachable direction Candidate Set S
Disassembly direction has been fully completed collision detection, and remaining direction is the detachable of part A in detachable direction Candidate Set S at this time
Direction collection judges to terminate.
The method in the detachable direction of part A is calculated in step 3 above-mentioned according to the type of each passive bound relationship such as
Under：
Step S1：If the type of passive bound relationship is " matching " or " offset matching ", with the matching plane on part A
Normal direction detachable direction of the negative direction as part, and the disassembly direction is inserted into candidate detachable direction collection S；
Step S2：If the type of passive bound relationship be " alignment " or " offset alignment ", on part A to flush
Detachable direction of the normal direction as part, and the disassembly direction is inserted into candidate detachable direction collection S；
Step S3：If the type of passive bound relationship is " coaxial ", with two of the axis corresponding to the constraint on part A
Detachable direction of a direction opposite each other as part, and this 2 disassembly directions are inserted into candidate detachable direction collection S
In；
Step S4：If the type of passive bound relationship is " coordinate system alignment " or " automatic ", with 3 of assembling coordinate system
Detachable direction of 6 axial directions of reference axis as part, and this 6 disassembly directions are inserted into candidate detachable direction collection S
In；
Step S5：If the type of passive bound relationship is " tangent ", with the anti-of the normal direction of the correspondence phase section on part A
Direction, or correspond to the normal direction of phase section using in assembly and be inserted into time as the detachable direction of part, and the disassembly direction
It selects in detachable direction collection S；
Step S6：Identical detachable direction in detachable direction Candidate Set S is merged, it can with eliminate redundancy
Disassembly direction.
The invention has the beneficial effects that：The detachable direction of part in the engineering goods assembling model of the present invention is automatic
Judgment method realizes the detachability of part and detachable candidate direction according to the assembly restriction between part in assembling model
Judgement, and combine Collision Detection finally determine part detachable direction collection, in a particular application have be easy to implement,
It is concisely and efficiently feature.Present invention could apply to engineering goods virtually to dismantle emulation, engineering goods assembly or disassembly sequence rule
It draws etc. in software systems.
Description of the drawings
Fig. 1 is the detachable direction automatic judging method steps flow chart of the part in engineering goods assembling model of the present invention
Figure；
Fig. 2 is implementation steps figure of the present invention by taking the disassembly sequence planning of engineering goods assembling model as an example.
Specific implementation mode
Specific introduce is made to the present invention below in conjunction with the drawings and specific embodiments.
Shown in referring to Fig.1, the detachable direction that the present invention provides the part in a kind of engineering goods assembling model is sentenced automatically
Disconnected method, includes the following steps：
Step 1：If part A exists to the active constraint relationships of other parts in assembling model, part A can not be by
Dismounting, judges to terminate；
Step 2：If the active constraint relationship to other parts in assembling model had both been not present in part A, phase is also not present
For the passive bound relationship of other parts in assembling model, then zero is established with 6 axial directions of 3 reference axis of assembling coordinate system
The detachable direction collection S of candidate of part A, goes to step four；
Step 3：If part A is not present to the active constraint relationships of other parts in assembling model, but exist relative to
The passive bound relationship of other parts in assembling model then calculates the removable of part A according to the type of each passive bound relationship
Direction is unloaded, and the detachable direction collection S of the candidate for establishing part A；
Step 4：The candidate detachable direction D of each of detachable direction Candidate Set S for part A, to the edges part A
Candidate detachable direction D does collision detection, if part A collides with the other parts in assembling model, from detachable
Candidate detachable direction D is deleted in the Candidate Set S of direction.The step is repeated, until all candidates can in detachable direction Candidate Set S
Disassembly direction has been fully completed collision detection, and remaining direction is the detachable of part A in detachable direction Candidate Set S at this time
Direction collection judges to terminate.
Here part A exists：Exist in assembling model
Other parts refer to one or more geometric elements on part A, and it is all these in assembling model to lead to the presence of part A
Refer to the basis present in the part of the geometric element of part A.
Here part A exists refers to relative to the passive bound relationship of other parts in assembling model：Part A is referred to
One or more geometric elements in assembling model in other parts cause all these in assembling model to be referred to by part A
The part of geometric element is the basis present in part A.
The method in the detachable direction of part A is calculated in step 3 above-mentioned according to the type of each passive bound relationship such as
Under：
Step S1：If the type of passive bound relationship is " matching " or " offset matching ", with the matching plane on part A
Normal direction detachable direction of the negative direction as part, and the disassembly direction is inserted into candidate detachable direction collection S；
Step S2：If the type of passive bound relationship be " alignment " or " offset alignment ", on part A to flush
Detachable direction of the normal direction as part, and the disassembly direction is inserted into candidate detachable direction collection S；
Step S3：If the type of passive bound relationship is " coaxial ", with two of the axis corresponding to the constraint on part A
Detachable direction of a direction opposite each other as part, and this 2 disassembly directions are inserted into candidate detachable direction collection S
In；
Step S4：If the type of passive bound relationship is " coordinate system alignment " or " automatic ", with 3 of assembling coordinate system
Detachable direction of 6 axial directions of reference axis as part, and this 6 disassembly directions are inserted into candidate detachable direction collection S
In；
Step S5：If the type of passive bound relationship is " tangent ", with the anti-of the normal direction of the correspondence phase section on part A
Direction, or correspond to the normal direction of phase section using in assembly and be inserted into time as the detachable direction of part, and the disassembly direction
It selects in detachable direction collection S；
Step S6：Identical detachable direction in detachable direction Candidate Set S is merged, it can with eliminate redundancy
Disassembly direction.
The present invention needs to prepare engineering goods assembling model in advance when implementing, and prepares to correspond to engineering goods dress
The description data of all assembly restrictions with model.Come by taking the disassembly sequence planning of engineering goods assembling model as an example below
The implementation steps based on the present invention are discussed, as Fig. 2 gives step implementation figure.In discourse process, for the existing skill being related to
Art, the present invention will not specifically be unfolded.Those skilled in the art are referred to disclosed various technical manuals, teaching reference book, reality
Apply the implementation of the auxiliary such as example.
Step 1：For an engineering goods numeric terminal model M to be removed, examined using method proposed by the present invention
Each part in M is looked into, the detachable direction set of each part in dismountable part set P and P in M is obtained；
Step 2：A part A to be removed is specified in part set P by user, and by user in the removable of part A
It unloads and selectes a disassembly direction in the set S of direction；
Step 3：Dismounting is implemented to part A according to the disassembly direction of selected part A and selected part A, is deleted from M
Except A, disassembly sequence planning table is updated, and all description numbers related with A are deleted from the description data of the assembly restriction of M
According to；
Step 4：Judge whether M is empty, if M is sky, disassembly sequence planning process terminates, and otherwise goes to step 1,
Repeat the disassembly sequence planning process.
In above step two, the process of part to be removed is selected in part set P, and to be removed to what is selected
The process of its disassembly direction of parts information model can also be selected by computer system is automated randomized.
The detachable direction automatic judging method of part in the engineering goods assembling model of the present invention, according to assembling model
Assembly restriction between middle part realizes the judgement of the detachability and detachable candidate direction of part, and combines collision detection
Technology finally determines the detachable direction collection of part, has the characteristics that be easy to implement in a particular application, be concisely and efficiently.The present invention
Engineering goods are can be applied to virtually to dismantle in the software systems such as emulation, engineering goods assembly or disassembly Sequence Planning.
The basic principles, main features and advantages of the invention have been shown and described above.The technical staff of the industry should
Understand, the invention is not limited in any way above-described embodiment, all to be obtained by the way of equivalent substitution or equivalent transformation
Technical solution is all fallen in protection scope of the present invention.
Claims (1)
1. a kind of detachable direction automatic judging method of the part in engineering goods assembling model, which is characterized in that for waiting for
Any one part A in the assembling model of dismounting includes the following steps according to the restriction relation between part：
Step 1：If part A has the active constraint relationship to other parts in assembling model, part A can not be disassembled,
Judgement terminates；
Step 2：If part A had both been not present to the active constraint relationships of other parts in assembling model, be also not present relative to
The passive bound relationship of other parts in assembling model then establishes part A with 6 axial directions of 3 reference axis of assembling coordinate system
The detachable direction collection S of candidate, go to step four；
Step 3：If the active constraint relationship to other parts in assembling model is not present in part A, but exists relative to assembly
The passive bound relationship of other parts in model then calculates the detachable side of part A according to the type of each passive bound relationship
To, and the detachable direction collection S of candidate for establishing part A；
Active constraint relationship refers to：There are other parts to refer to one or more geometric elements on part A in assembling model,
It is the basis in assembling model present in the part of all these geometric elements for referring to part A to lead to the presence of part A；
Passive bound relationship refers to：Part A refers to one or more geometric elements in other parts in assembling model, causes
All these parts that geometric element is referred to by part A are the bases present in part A in assembling model；
The method for calculating the detachable direction of part A in the step 3 according to the type of each passive bound relationship is as follows：
Step S1：If the type of passive bound relationship is " matching " or " offset matching ", with the method for the matching plane on part A
To detachable direction of the negative direction as part, and the disassembly direction is inserted into candidate detachable direction collection S；
Step S2：If the type of passive bound relationship is " alignment " or " offset alignment ", with the method to flush on part A
It is inserted into candidate detachable direction collection S to the detachable direction as part, and the disassembly direction；
Step S3：If the type of passive bound relationship is " coaxial ", mutually with two of the axis corresponding to the constraint on part A
Detachable direction for opposite direction as part, and this 2 disassembly directions are inserted into candidate detachable direction collection S；
Step S4：If the type of passive bound relationship is " coordinate system alignment " or " automatic ", with 3 coordinates of assembling coordinate system
Detachable direction of 6 axial directions of axis as part, and this 6 disassembly directions are inserted into candidate detachable direction collection S；
Step S5：If the type of passive bound relationship is " tangent ", with the negative side of the normal direction of the correspondence phase section on part A
To, or correspond to the normal direction of phase section using in assembly and be inserted into candidate as the detachable direction of part, and the disassembly direction
In detachable direction collection S；
Step S6：Identical detachable direction in detachable direction Candidate Set S is merged, to eliminate the detachable of redundancy
Direction；
Step 4：The candidate detachable direction D of each of detachable direction Candidate Set S for part A, to part A along candidate
Detachable direction D does collision detection, if part A collides with the other parts in assembling model, from detachable direction
Candidate detachable direction D is deleted in Candidate Set S；The step is repeated, until all candidate detachable in detachable direction Candidate Set S
Direction has been fully completed collision detection, at this time in detachable direction Candidate Set S remaining direction be part A detachable direction
Collection, judges to terminate.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103617329A (en) * | 2013-12-12 | 2014-03-05 | 西安工业大学 | Assembly time evaluating method based on artificial neural network and virtual assembly |
| CN104200242A (en) * | 2014-06-20 | 2014-12-10 | 华东理工大学 | RFID (Radio Frequency Identification) based mechanical and electrical product recovery method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030097195A1 (en) * | 2001-11-20 | 2003-05-22 | General Electric Company | Method for computing disassembly sequences from geometric models |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103617329A (en) * | 2013-12-12 | 2014-03-05 | 西安工业大学 | Assembly time evaluating method based on artificial neural network and virtual assembly |
| CN104200242A (en) * | 2014-06-20 | 2014-12-10 | 华东理工大学 | RFID (Radio Frequency Identification) based mechanical and electrical product recovery method |
Non-Patent Citations (3)
| Title |
|---|
| "Disassemblability Modeling Technology of Configurable Product Based on Disassembly Constraint Relation Weighted Design Structure Matrix(DSM)";Lemiao Qiu.et al;《CHINESE JOURNAL OF MECHANICAL ENGINEERING》;20140317;第27卷(第03期);第511-515页 * |
| "基于力反馈的虚拟拆卸系统关键技术研究";李嘉 等;《图学学报》;20140630;第35卷(第03期);第450-454页 * |
| "装配序列规划中拆卸方向的确定";田立中 等;《计算机辅助设计与图形学学报》;20011231;第13卷(第12期);第1110-1112页 * |
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