CN109344455A - A kind of tolerance specifications generation method based on ontology - Google Patents
A kind of tolerance specifications generation method based on ontology Download PDFInfo
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- CN109344455A CN109344455A CN201811055376.7A CN201811055376A CN109344455A CN 109344455 A CN109344455 A CN 109344455A CN 201811055376 A CN201811055376 A CN 201811055376A CN 109344455 A CN109344455 A CN 109344455A
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Abstract
The invention discloses a kind of generation methods of tolerance specifications based on ontology rule description, its process is: from the constraint relationship in assembly features face, the relationship being located by connecting between priority relationship, basic fiting constraint and freedom degree, establishing tolerance specifications indicates model.It is located by connecting the inherent inference mechanism of priority and tolerance specifications based on assembly, realizes tolerance specifications design.Specific step is as follows for this method: (1) constructing the three-dimensional assembling model of product；(2) the 3D assembling model of product is solved；(3) each part of assembly is traversed, its assembly features surface is extracted；(4) it extracts and assembles the information that is located by connecting；(5) building assembly features surface restraint relationship and freedom degree relationship assert axiom collection；(6) class and attribute of tolerance specifications ontology model are constructed；(7) mapping ruler being located by connecting with tolerance specifications is established；(8) mapping ruler of characteristic face priority and tolerance specifications is established；(9) it establishes benchmark and selects Tolerance Principle；(10) optimum results of tolerance specifications are exported.
Description
Technical field
The invention belongs to the fields computer-aided tolerance design (CAT), and in particular to a kind of product design software and manufacture
The design method based on ontology that software mutually considers, can be used for the generation of tolerance specifications.
Background technique
Tolerance specifications are the important links in tolerance design, and main includes the selection of tolerance type, Datum reference frames
Establish the use etc. with Tolerance Principle.Traditional tolerance specifications design is mainly realized that this is often increased by designer's experience
The irrationality and uncertainty of tolerance specifications.
Tolerance specifications at this stage are seldom related to the primary and secondary being located by connecting according to assembly sequence and automatically generate to realize, are filling
The design phase of ligand respectively assembles the contribution mode being located by connecting to assembly geometric functions demand in the assembling process of part
It is different with degree, if the primary and secondary sequence that the tolerance specifications design of part is located by connecting with assembly is not able to satisfy designer
Expection, then may cause part can not be successfully installation.
Summary of the invention
The technical problem to be solved by the present invention is to give a kind of product design software and manufacture software mutually considers
Design method based on ontology, this method can be used for automatically generating for tolerance specifications, and repair to a variable or constraint
Change or when delete operation, associated modification or the deletion of associated variable and constraint is able to achieve, to ensure that the consistent of tolerance specifications
Property, reach expected purpose.
To solve the above-mentioned problems, the present invention is realized by following scheme:
Step 1: constructing the three-dimensional assembling model of product；
According to the functional requirement of product and the ideal dimensions of each part, constructed using three-dimensional solid modeling software SolidWorks
The three-dimensional assembling model of product.
Step 2: solving the 3D assembling model of product；
According to the structure of product, de-assembly is carried out to the three-dimensional assembling model of product in three-dimensional software, by model decomposition Cheng Ruo
Dry part or several part groups.
Step 3: traversal assembles each part, and construct its assembly features surface model asserts set Asf；
According to the topological relation between each part, by three-dimensional objects each part or several part groups further decompose
At 2 or more assembly features surfaces, the assembly features surface of each part is automatically extracted.
Step 4: extracting and assemble the information that is located by connecting；
It according to the assembly features surface type that step 3 and step 4 obtain, obtains and assembles the information that is located by connecting, and construct positioning and connect
Meet set Af。
Step 5: building expression assembly features surface restraint relationship asserts axiom collection A with freedom degree relationshipdf；
The assembly restriction between part extracted according to step 4, building indicate disconnected between the constraint relationship and freedom degree
Say axiom collection.
Step 6: the class and attribute of building tolerance specifications ontology model；
By consulting the relevant knowledge in this field, existing class and attribute are used for reference, it will be in the description of tolerance specifications information representation model
The term of unary be defined as class, indicate that the term of binary crelation is defined as attribute.
Step 7: establishing inference rule, reasoning determines the priority of assembly connection connection, exports connection priority global set
Close Apd；
The priority create-rule that assembly is located by connecting is established by analysis, the constraint relationship in step 4 is asserted into set AfMake
For input, reasoning exports the global set of connection priority.
Step 8: establishing the mapping ruler of characteristic face priority and tolerance specifications；
Axiom collection A is asserted between the figuratrix extracted according to step 3sfWith the constraint relationship and freedom degree in step 6
Assert that axiom collection, building expression feature assembly restriction assert axiom collection Adf。
Step 9: establishing benchmark and select Tolerance Principle；
Connection priority rule is constructed by semantic net rule language (SWRL).
Step 10: reasoning determines tolerance specifications as a result, output tolerance specifications global set；
Axiom collection is asserted as input, by network ontology language OWL using the priority of the assembly connection connection constructed in step 7
The structural knowledge of description is converted to the Jess fact, and the semantic net rule language SWRL constraint expression described is converted into Jess
Rule generates tolerance specifications result using Jess inference engine later finally with Jess rule.As obtained by traversal step 5
The aggregate information that is located by connecting, export the global set of tolerance specifications.
Detailed description of the invention
Fig. 1, the flow chart of basic skills of the invention.
Fig. 2, threedimensional model of the present invention to motor.
Fig. 3, the figuratrix figure of motor.
Fig. 4, the constraint relationship figure between basic fiting constraint and freedom degree.
Fig. 5, characteristic face type and its identification condition.
Fig. 6, the hierarchical relationship and attributed graph of all OWL classes that the present invention constructs.
Fig. 7, the verifying flow chart of Datum reference frames.
Fig. 8, the mapping graph being located by connecting with tolerance specifications form.
Fig. 9, the assembly using SWRL description that the present invention establishes are set to the create-rule of connection priority.
Figure 10, the reasoning results figure of the invention.
The present invention describes entire reasoning process using OWL and SWRL, has many advantages, such as simple, efficient and intelligent.It meets
Tolerance information effectively shared and smooth transmitting demand between isomery CAX system, meets the top-down thinking of designer and practises
It is used, there is stronger applicability, ensure that the consistency of position constraint.
Specific embodiment
Hole axle cooperation is one of most common important fits kind in engineering goods, determines hole according to the functional requirement of product
The fiting property of axis carries out reasonable tolerance specifications design, has important meaning with manufacturing cost is reduced to assembly precision is guaranteed
Justice.Carry out the implementation process of illustration method by taking simplified motor assembly as an example below.The component is by a housing part Part A
It is formed with an end cap part Part B, threedimensional model is shown in Fig. 2.In order to simplify process, the present invention only gives electric machine casing
Tolerance specifications, the tolerance specifications process of end cap is similar.The process that automatically generates of tolerance specifications of the present invention is shown in Fig. 1.
Step 1: constructing the three-dimensional assembling model of product.According to the functional requirement of product and the ideal dimensions of each part, make
The three-dimensional assembling model that product is constructed with three-dimensional solid modeling software SolidWorks, is shown in Fig. 2.
Step 2: solving the 3D assembling model of product.According to the structure of product, the three-dimensional of product is assembled in three-dimensional software
Model carries out de-assembly and sees Fig. 3 by model decomposition at part Part A and Part B.
Step 3: traversal assembles each part, and construct its assembly features surface model asserts set Asf.According to each part
Between topological relation, by three-dimensional objects each part or several part groups further decompose into 2 or more and assemble
Figuratrix automatically extracts the assembly features surface of each part.It, will be in three-dimensional objects according to the topological relation between each part
Each part further decomposes into 6 assembly features surfaces, automatically extracts the assembly features surface of each part.Housing part Part
Fig. 3 is seen on the assembly features surface of A and end cap part Part B, wherein a1(shell end face), the cylindrical surface of a2(housing bore),
The cylindrical surface of a3(shell upper bolt aperture) be part Part A assembly features face, b1(end cap end face), the cylinder of b2(end-cover axle
Face), the cylindrical surface of b1(end-cover axle upper bolt aperture) be part Part B assembly features face, see Fig. 3.
Step 4: extracting and assemble the information that is located by connecting.According to the assembly features surface type that step 3 and step 4 obtain, obtain
The information that is located by connecting must be assembled, and constructs the set A that is located by connectingf={ Joint1, Joint2, Joint3 }, the connection letter of building
Breath is shown in Fig. 3, and the constraint relationship between cooperating is shown in Fig. 4, and the priority of junction is measured by its number of degrees of freedom, limited.Pass through
Interpreting blueprints 4 can be obtained main chain and be connected in Joint1, and secondary to be connected as Joint2, third is connected as Joint3.
Step 5: building expression assembly features surface restraint relationship asserts axiom collection A with freedom degree relationshipdf.It will assembly spy
Sign face is divided into following two form: single features face and compound characteristics face, wherein single features face include plane, cylindrical surface,
Spherical surface, circular conical surface and anchor ring etc., and compound characteristics face is to repeat to be formed by after adding up with multiple independent single features faces
Feature, including parallel plane, symmetrical plane, coplanar flat, parallel cylinder and concentric cylinder etc. are shown in the AFS of Fig. 5 PartA
Assert set FS1={ PL (a1), CY (a1), PC (a3) }, the AFS of PartA asserts set FS2={PL(b1),CY(b1),PC
(b3)}。
Step 6: the class and attribute of building tolerance specifications ontology model are shown in Fig. 6.
Step 7: the selection of Datum reference frames.See Fig. 7 flow chart, executing rule 8-12, the predicative set of available DRF
Close A5={ Main_DRF (a1, a2), Auxiliary_DRF (b1, b2, b3) }, A6={Primary_Datum(a1,b1),
Secondary_Datum(a2,b2), Tertiary_Datum(a3,b3)}.The available DRF of benchmark can be obtained asserts set
A5={ Main_DRF (a1, a2), Auxiliary_DRF (b1, b2, b3) }, A6={Primary_Datum(a1,b1),
Secondary_Datum(a2,b2), Tertiary_Datum(a3,b3)}。
Step 8: establishing the mapping ruler of characteristic face priority and tolerance specifications.Fig. 8 give the priority of characteristic face with
Corresponding relationship between tolerance specifications.
Step 9: establishing benchmark and select Tolerance Principle.The ontology rule SWRL of rule required for tolerance specifications is compiled
It writes, sees Fig. 9.
Step 10: reasoning determines tolerance specifications as a result, output tolerance specifications global set.Final output result is shown in figure
10。
Claims (5)
1. kind of the tolerance specifications generation method based on ontology, characterized by the following steps:
(1) the three-dimensional assembling model of product is constructed；
(2) the 3D assembling model of product is solved；
(3) each part of assembly is traversed, construct its assembly features surface model asserts set；
(4) it extracts and assembles the information that is located by connecting；
(5) what building indicated assembly features surface restraint relationship and freedom degree relationship asserts axiom collection；
(6) class and attribute of tolerance specifications ontology model are constructed；
(7) inference rule is established, reasoning determines the priority of assembly connection connection, exports connection priority global set；
(8) mapping ruler of characteristic face priority and tolerance specifications is established；
(9) it establishes benchmark and selects Tolerance Principle；
(10) reasoning determines tolerance specifications as a result, output tolerance specifications global set.
2. tolerance specifications generation method as described in claim 1, it is characterised in that: the assembly connection information based on product is adopted
The constraint relationship between the priority and tolerance specifications in assembly connection binding characteristic face is indicated with network ontology language OWL building
Assert axiomatic set theory.
3. tolerance specifications generation method as described in claim 1, it is characterised in that: based on assembly be located by connecting priority with
The inherent inference mechanism of tolerance specifications, realize tolerance specifications design using network ontology language OWL building indicate the constraint relationship with
Axiom collection is asserted between freedom degree.
4. tolerance specifications generation method as described in claim 1, it is characterised in that: be based on tolerance specifications information model, pass through
Semantic net rule language (SWRL) constructs tolerance specifications create-rule.
5. tolerance specifications generation method as described in claim 1, it is characterised in that: reasoning determines the preferential of assembly connection contact
Grade, output contact priority global set assert axiom with the constraint relationship between the assembly features surface that constructs in step 9
Collection is converted to the Jess fact as input, by the network ontology language OWL structural knowledge described, and by semantic net rule language
The constraint expression of SWRL description is converted into Jess rule, finally generates part tolerance with Jess rule and Jess inference engine
Specification result.
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Application publication date: 20190215 |