CN103927405B - A kind of construction method of build-up tolerance network - Google Patents
A kind of construction method of build-up tolerance network Download PDFInfo
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Abstract
The present invention relates to a kind of construction method of build-up tolerance network, extracts the assembly information of product from the threedimensional model of CAD system, its Assembly sequences is generated, and is based on VGC theory building VGC networks on this basis；By VGC and the corresponding relation and the tolerance type information from the input of step a of tolerance type, reasoning generates three class build-up tolerance types, is then added to VGC network struction build-up tolerance networks；Assembly sequences, VGC networks and the build-up tolerance network that step b is generated is shown in CAD system, while the tolerance network information is exported for tolerance optimization design.The present invention builds build-up tolerance design system on CAD system platform, using the comprehensive Design of the information realization fitted position tolerance and geometric tolerances obtained from product entity model.
Description
Technical field
The present invention relates to a kind of method for designing of mechanical assembly tolerance, more particularly to a kind of structure side of build-up tolerance network
Method.
Background technology
In prior art, tolerance design is an important process of product development, be product function demand and manufacturing cost it
Between an important step, be related to each stage of product life cycle.Build-up tolerance is one of tolerance design important interior
Hold, not only decide the assemble ability and quality of product, but also affect the manufacturing cost and service life of product.In the past
Many decades, the research with regard to tolerance design have been achieved for very big progress.In some CAD system, have been able to specify single
The dimensional tolerance value of individual part.But, not a standard with regard to how to realize assembly build-up tolerance design illustrate,
Less there is a method being used widely.Therefore, how to realize in CAD system build-up tolerance automatically generate into
For a problem in the urgent need to address.
Along with the fast development of computer networking technology and database technology, network Remote Mechanical Design technology
Reach its maturity.But, the build-up tolerance design tool due to still lacking maturation in the market, this coordination to tolerance design
Difficulty is caused, the designing quality and efficiency of complex mechanical product is affected.One of key issue of Mechanical Product Collaborative Design is to protect
The concordance of barrier build-up tolerance design principle.And it is the system for realizing tolerance design to obtain this conforming most efficient method
Change, automatization and tool.
In view of drawbacks described above, creator of the present invention passes through prolonged research and practice obtains this creation finally.
The content of the invention
It is an object of the invention to provide a kind of construction method of build-up tolerance network, to overcome above-mentioned technological deficiency.
For achieving the above object, the present invention provides a kind of construction method of build-up tolerance network, and its process is：
Step b1, using LTG and AME algorithms, extracts assembly information from the threedimensional model of product；
Step b2, builds the assembly tree with hierarchical architecture according to the create-rule of assembly tree；
Step b3, it is theoretical based on PST, set up different positioned at assembly tree using geological information and the assembly information of product
The assembly informationmodel of the sub-assemblies on layer；
Step b4, extracts assembly information from the threedimensional model of assembly informationmodel and product, with part to as substantially single
Unit sets up assembly relationship model；
Step b5, sets up the positioning relation model of part respectively and interferes relational model, ultimately generate Assembly sequences；
Step b6, determines matching tree and Datum reference frames and generates assembly features chain based on VGC is theoretical；
Step b7, is identified to the VGC in assembly features chain using SVGC, CVGC and MVGC inference understanding, has been built
The VGC networks of staff cultivation；
Step b8, using self-reference, mutually reference and fit tolerance inference understanding obtain the assembling public affairs corresponding to each VGC
Difference；
The build-up tolerance that step b8 is inferred is added to the tolerance network of VGC net structure Complete Binds by step b9.
Further, before above-mentioned steps b1, also with following reasoning build-up tolerance types and its corresponding tolerance range class
The process of type：
Step a1, sets up the three-dimensional assembling model of product in CAD system；
Assembling model is decomposed into part by step a2；
Step a3, extracts the assembly restriction between part from the threedimensional model of product with LTC algorithms；
Step a4, sets up the assembly relation matrix of part based on PST theories；
Step a5, extracts the assembly features of part with AME algorithms；
Step a6, obtains information from the assembly relation matrix of part, sets up assembly features with TTRS theories based on PST is theoretical
Assembly restriction matrix between face；
Step a7, meanwhile, the Datum reference frames in reasoning assembly features face；
Step a8, by assembly constraint type inferencing relational matrix, reasoning obtains the assembling in every a pair of assembly features face about
Beam type；
Step a9, using build-up tolerance type inferencing relational matrix, two assembly features faces in the constraint of reasoning assembly features
Corresponding build-up tolerance function；
Step a10, with the selection of the functional requirement of product, the geometry site in assembly features face and build-up tolerance type
It is constraints with optimization principles etc., selects to meet the build-up tolerance class of assembly features design requirement from build-up tolerance function
Type；
Step a11, according to the derivation relationship matrix and the Datum reference frames in assembly features face of geometric tolerances tolerance range,
Reasoning obtains each tolerance range set function corresponding to build-up tolerance type in assembly features face；
Step a12, according to the change in location or its minimum geometry reference element in assembly features face, finally determines tolerance
Tolerance belt type corresponding to type；
Step a13, the reasoning results of step a9 and step a12 is combined and obtains each assembling spy in assembly
Levying face needs the build-up tolerance type and its tolerance belt type of design.
Further, SVGC, CVGC and MVGC inference understanding is applied in above-mentioned steps b7, infers the variation between features described above
Geometrical constraint, is added in the formula of following assembly features chains,
DRF15→P15_ADF1→P15_RF1→P14_RF1→P14_ADF1→DRF14→P14_ADF2→P14_RF2→P17_
RF1→P17_ADF1→DRF17→P17_ADF2→P17_RF2→P16_RF1→P16_ADF1→DRF16
In formula, DRF14, DRF15, DRF16 and DRF17 represent the Datum reference frames of part P14, P15, P16 and P17；
Wherein, ADF1 and ADF2 are belonging to 2 fitting derived characters of Same Part；RF1 and RF2 are also belonging to 2 of Same Part
Actual characteristic；
Finally, expression formula is broken down into fluctuation component respectively along X, Y and the Variational Geometric Constraints of Z axis translation and rotation
Chain, is shown below,
In formula, Tx, Ty, Tz, Rx, Ry and Rz represent translation and the rotational freedom along 3 coordinate axess respectively, → represent
From fixed reference feature to the path of restrained feature,Two features being coupled together by it of expression fixed reference feature and by about each other
Shu Tezheng；DRF14, DRF15, DRF16 and DRF17 represent the Datum reference frames of part P14, P15, P16 and P17.
Further, tolerance type inferencing matrix is utilized in above-mentioned steps b8, can be inferred with each variation geometry about
The corresponding tolerance type of beam, obtains the tolerance chain of assembly P, by following public affairs in being then added to Variational Geometric Constraints chain
Formula is calculated：
In formula, DRF14, DRF15, DRF16 and DRF17 represent the Datum reference frames of part P14, P15, P16 and P17；
Wherein, ADF1 and ADF2 are belonging to 2 fitting derived characters of Same Part；RF1 and RF2 are also belonging to 2 of Same Part
Actual characteristic；Tx, Ty, Tz, Rx, Ry and Rz represent translation and the rotational freedom along 3 coordinate axess respectively, → represent from ginseng
Feature is examined to the path of restrained feature,Represent two features coupled together by it fixed reference feature and restrained spy each other
Levy；DRF14, DRF15, DRF16 and DRF17 represent the Datum reference frames of part P14, P15, P16 and P17.
Further, in above-mentioned steps b9, calculated by following formula, calculated by following formula,
In formula, DRF14, DRF15, DRF16 and DRF17 represent the Datum reference frames of part P14, P15, P16 and P17；
Wherein, ADF1 and ADF2 are belonging to 2 fitting derived characters of Same Part；RF1 and RF2 are also belonging to 2 of Same Part
Actual characteristic；Tx, Ty, Tz, Rx, Ry and Rz represent translation and the rotational freedom along 3 coordinate axess respectively, → represent from ginseng
Feature is examined to the path of restrained feature,Represent two features coupled together by it fixed reference feature and restrained spy each other
Levy；DRF14, DRF15, DRF16 and DRF17 represent the Datum reference frames of part P14, P15, P16 and P17.
Compared with prior art the beneficial effects of the present invention is：It is public that the present invention builds assembling on CAD system platform
Difference design system, is set using the synthesis of the information realization fitted position tolerance and geometric tolerances that obtain from product entity model
Meter.The invention is not only to realize that CAT and the integrated of cad technique are explored, but also can be used as the week whole life of product
One of basis of interim information modeling.
Description of the drawings
Fig. 1 is the build-up tolerance design system flow chart of the present invention；
Fig. 2 is the build-up tolerance of the present invention, the flow chart of tolerance belt type design realization；
Fig. 3 is the flow chart that the build-up tolerance network design of the present invention is realized；
Fig. 4 is the flow chart that the tolerance optimization design of the present invention is realized.
Specific embodiment
It is below in conjunction with accompanying drawing, above-mentioned to the present invention to be described in more detail with other technical characteristic and advantage.
Present invention mainly solves the design problem of Complex Assembly body build-up tolerance, to realize build-up tolerance and tolerance range class
The synthesis of the design of type, the structure of build-up tolerance network and its size and geometric tolerances with minimum process cost as object function
Optimization design.
Refer to shown in Fig. 1, its be the present invention build-up tolerance design system flow chart, the present invention tolerance design system
The realization of system builds the measurements of the chest, waist and hips assembling model of product based on CAD system, and its design cycle includes：
Step a, reasoning build-up tolerance type and its corresponding tolerance belt type.
Obtain the assembly constraint information of product first from CAD system, according to assembly features type and its assembly restriction,
Corresponding build-up tolerance type is obtained using relational matrix reasoning, then using tolerance type and the corresponding relation of tolerance range, is pushed away
Reason obtains tolerance belt type.
The tolerance and tolerance belt type that step a can be inferred shown in CAD system, and by tolerance type information
Export for building build-up tolerance network.
Step b, builds build-up tolerance network.
The assembly information of product is extracted from the threedimensional model of CAD system, its Assembly sequences, and base on this basis is generated
In VGC theory building VGC networks；By VGC and the corresponding relation and the tolerance type letter from the input of step a of tolerance type
Breath, reasoning generate three class build-up tolerance types, are then added to VGC network struction build-up tolerance networks.
The Assembly sequences of step b generation, VGC networks and build-up tolerance network can be shown in CAD system, together
When the tolerance network information is exported for tolerance optimization design.
Step c, realizes tolerance optimization design.
Based on the build-up tolerance network information generated by step b, using tolerance chain therein as chromosome, size is public
Grade, form and position tolerance grade and functional requirement etc. are differed from as constraints, with minimum process cost as object function, by losing
Propagation algorithm realizes the Synthetical Optimization of size and geometric tolerances.
Refer to shown in Fig. 2, its be the present invention build-up tolerance, tolerance belt type design realize flow chart, the step
Suddenly the detailed process of a is：
Step a1, sets up the three-dimensional assembling model of product in CAD system；
Assembling model is decomposed into part by step a2；
Step a3, extracts the assembly restriction between part from the threedimensional model of product with LTC algorithms；
Step a4, sets up the assembly relation matrix of part based on PST theories；
Step a5, extracts the assembly features of part with AME algorithms；
Step a6, obtains information from the assembly relation matrix of part, sets up assembly features with TTRS theories based on PST is theoretical
Assembly restriction matrix between face；
Step a7, meanwhile, the Datum reference frames in reasoning assembly features face；
Step a8, by assembly constraint type inferencing relational matrix, reasoning obtains the assembling in every a pair of assembly features face about
Beam type；
Step a9, using build-up tolerance type inferencing relational matrix, two assembly features faces in the constraint of reasoning assembly features
Corresponding build-up tolerance function；
Step a10, with the selection of the functional requirement of product, the geometry site in assembly features face and build-up tolerance type
It is constraints with optimization principles etc., selects to meet the build-up tolerance class of assembly features design requirement from build-up tolerance function
Type；
Step a11, according to the derivation relationship matrix and the Datum reference frames in assembly features face of geometric tolerances tolerance range,
Reasoning obtains each tolerance range set function corresponding to build-up tolerance type in assembly features face；
Step a12, according to the change in location or its minimum geometry reference element in assembly features face, finally determines tolerance
Tolerance belt type corresponding to type；
Step a13, the reasoning results of step a9 and step a12 is combined and obtains each assembling spy in assembly
Levying face needs the build-up tolerance type and its tolerance belt type of design；
The reasoning results are shown in the user side of CAD system, and build-up tolerance type information therein is exported for tolerance
Network design.
Refer to shown in Fig. 3, its be the present invention build-up tolerance network design realize flow chart, the tool of step b
Body process is：
Step b1, using LTG and AME algorithms, extracts assembly information from the threedimensional model of product；
Step b2, builds the assembly tree with hierarchical architecture according to the create-rule of assembly tree；
Step b3, it is theoretical based on PST, set up different positioned at assembly tree using geological information and the assembly information of product
The assembly informationmodel of the sub-assemblies on layer；
Step b4, extracts assembly information from the threedimensional model of assembly informationmodel and product, with part to as substantially single
Unit sets up assembly relationship model；
Step b5, sets up the positioning relation model of part respectively and interferes relational model, ultimately generate Assembly sequences；
Step b6, determines matching tree and Datum reference frames and generates assembly features chain based on VGC is theoretical；
Two SVGC and well-determined MVGC inference understandings are combined together composition matching tree (Mate Tree, MT).By
The fitting derived character for belonging to all benchmark of Same Part is grouped together into Datum reference frames, it is stipulated that do not have between them
Having.
The Assembly sequences P of a certain assembly P obtained according to step b514→P17→P16→P154 matching trees can be obtained：
MT (P14, P17), MT (P17, P16), MT (P16, P14) and MT (P14, P15).The benchmark ginseng of part P14, P15, P16 and P17
Examine framework and be respectively DRF14, DRF15, DRF16 and DRF17.
Using matching tree and Datum reference frames as node, antithetical phrase Assembly sequences are reconstructed, and are allowed to originate in part
P15.As a result as shown in formula (1)：
DRF15→MT(P15, P14)→DRF14→MT(P14, P17)→DRF17
→MT(P17, P16)→DRF16 (1)
Above-mentioned expression formula can be further broken into the assembly features chain shown in formula (2)：
DRF15→P15_ADF1→P15_RF1→P14_RF1→P14_ADF1
→DRF14→P14_ADF2→P14_RF2→P17_RF1
→P17_ADF1→DRF17→P17_ADF2→P17_RF2 (2)
→P16_RF1→P16_ADF1→DRF16
Wherein, ADF1 and ADF2 are belonging to 2 fitting derived characters of Same Part.Similarly, RF1 and RF2 are also category
In 2 actual characteristics of Same Part.
Step b7, is identified to the VGC in assembly features chain using SVGC, CVGC and MVGC inference understanding, has been built
The VGC networks of staff cultivation；
Using SVGC, CVGC and MVGC inference understanding, the Variational Geometric Constraints between features described above are inferred, then by them
It is added in formula (2).Finally, to be broken down into fluctuation component several respectively along the variation of X, Y and Z axis translation and rotation for expression formula
What constraint chain, such as shown in formula (3).
In formula (3), Tx, Ty, Tz, Rx, Ry and Rz are represented respectively along the translation of 3 coordinate axess and rotatably mounted
Degree, → represent from fixed reference feature to the path of restrained feature,Two features that expression is coupled together by it are each other with reference to spy
Seek peace restrained feature.All of Variational Geometric Constraints link is combined the VGC networks for constituting whole assembly.
Step b8, using self-reference, mutually reference and fit tolerance inference understanding obtain the assembling public affairs corresponding to each VGC
Difference；
In tolerance inference understanding, same Variational Geometric Constraints may be corresponding with several tolerance types, therefore should
This is selected according to the assembly properties and functional requirement between mating parts.Using tolerance type inferencing matrix, can infer
With the corresponding tolerance type of each Variational Geometric Constraints, in being then added to Variational Geometric Constraints chain, assembly is obtained
Shown in the tolerance chain of P, such as formula (4)：
The build-up tolerance that step b8 is inferred is added to the tolerance network of VGC net structure Complete Binds, such as by step b9
Shown in formula (5).
The reasoning results are shown in CAD system, while exporting for tolerance optimization design.
Refer to shown in Fig. 4, its be the present invention tolerance optimization design realize flow chart, the concrete mistake of step c
Cheng Wei：
Step c1, based on the tolerance chain information generated by step b, according to processing method, form and position tolerance and dimensional tolerance
Corresponding relation select form and position tolerance grade；
Step c2, sets up form and position tolerance processing cost function；
Step c3, based on the tolerance chain information generated by step b, selects reference system, dimensional tolerance grade and its assembling
The cooperation of feature；
Step c4, sets up dimensional tolerance processing cost function；
Step c5, based on the tolerance chain information generated by build-up tolerance network design module, with the function of Product Assembly
Closed-loop of the demand as tolerance chain, is translated into binary coding string, as the chromosome of genetic algorithm, by selecting,
The operation such as intersection and variation, to obtain optimum or close to optimum size and geometric tolerances value.
User side of the tolerance optimization design result in CAD system is shown.
The present invention builds build-up tolerance design system on CAD system platform, using what is obtained from product entity model
The comprehensive Design of information realization fitted position tolerance and geometric tolerances.The invention is not only to realize being integrated into for CAT and cad technique
Go exploration, but also can be used as one of basis of information modeling in the whole product life cycle.
Presently preferred embodiments of the present invention is the foregoing is only, is merely illustrative for invention, and it is nonrestrictive.
Those skilled in the art understanding, can carry out many changes in the spirit and scope limited by invention claim to which, change,
It is even equivalent, but fall within protection scope of the present invention.
Claims (4)
1. a kind of construction method of build-up tolerance network, it is characterised in that its process is：
Step b0, reasoning build-up tolerance type and its corresponding tolerance belt type, its step include：
Step a1, sets up the three-dimensional assembling model of product in CAD system；
Assembling model is decomposed into part by step a2；
Step a3, extracts the assembly restriction between part from the threedimensional model of product with LTC algorithms；
Step a4, sets up the assembly relation matrix of part based on PST theories；
Step a5, extracts the assembly features of part with AME algorithms；
Step a6, obtains information from the assembly relation matrix of part, is set up between assembly features face based on PST theories and TTRS theories
Assembly restriction matrix；
Step a7, meanwhile, the Datum reference frames in reasoning assembly features face；
Step a8, by assembly constraint type inferencing relational matrix, reasoning obtains the assembly constraint class in every a pair of assembly features face
Type；
Step a9, using build-up tolerance type inferencing relational matrix, in the constraint of reasoning assembly features, two assembly features face institutes are right
The build-up tolerance function answered；
Step a10, with the functional requirement of product, the selection of the geometry site in assembly features face and build-up tolerance type and excellent
It is constraints to change principle etc., selects to meet the build-up tolerance type of assembly features design requirement from build-up tolerance function；
Step a11, according to the derivation relationship matrix and the Datum reference frames in assembly features face of geometric tolerances tolerance range, reasoning
Obtain each tolerance range set function corresponding to build-up tolerance type in assembly features face；
Step a12, it is according to the change in location or its minimum geometry reference element in assembly features face, final to determine tolerance type
Corresponding tolerance belt type；
Step a13, the reasoning results of step a9 and step a12 are combined each the assembly features face in assembly that obtains
Need the build-up tolerance type and its tolerance belt type of design；
Step b1, using LTG and AME algorithms, extracts assembly information from the threedimensional model of product；
Step b2, builds the assembly tree with hierarchical architecture according to the create-rule of assembly tree；
Step b3, it is theoretical based on PST, set up on assembly tree different layers using the geological information and assembly information of product
Sub-assemblies assembly informationmodel；
Step b4, extracts assembly information, from the threedimensional model of assembly informationmodel and product with part to building as elementary cell
Vertical assembly relationship model；
Step b5, sets up the positioning relation model of part respectively and interferes relational model, ultimately generate Assembly sequences；
Step b6, determines matching tree and Datum reference frames and generates assembly features chain based on VGC is theoretical；
Step b7, is identified to the VGC in assembly features chain using SVGC, CVGC and MVGC inference understanding, is built completely about
The VGC networks of beam；
Step b8, using self-reference, mutually reference and fit tolerance inference understanding obtain the build-up tolerance corresponding to each VGC；
The build-up tolerance that step b8 is inferred is added to the tolerance network of VGC net structure Complete Binds by step b9.
2. the construction method of build-up tolerance network according to claim 1, it is characterised in that apply in above-mentioned steps b7
SVGC, CVGC and MVGC inference understanding, infers the Variational Geometric Constraints between features described above, is added to following assembly features chains
In formula,
DRF15→P15_ADF1→P15_RF1→P14_RF1→P14_ADF1
→DRF14→P14_ADF2→P14_RF2→P17_RF1
→P17_ADF1→DRF17→P17_ADF2→P17_RF2
→P16_RF1→P16_ADF1→DRF16
In formula, DRF14, DRF15, DRF16 and DRF17 represent the Datum reference frames of part P14, P15, P16 and P17；Wherein,
ADF1 and ADF2 are belonging to 2 fitting derived characters of Same Part；RF1 and RF2 are also belonging to 2 actual spies of Same Part
Levy；
Finally, expression formula is broken down into Variational Geometric Constraints chain of the fluctuation component respectively along X, Y and Z axis translation and rotation, such as
Shown in following formula,
In formula, Tx, Ty, Tz, Rx, Ry and Rz represent translation and the rotational freedom along 3 coordinate axess respectively, → represent from ginseng
Feature is examined to the path of restrained feature,Represent two features coupled together by it fixed reference feature and restrained spy each other
Levy.
3. the construction method of build-up tolerance network according to claim 1, it is characterised in that using public affairs in above-mentioned steps b8
Difference type inferencing matrix, can infer with the corresponding tolerance type of each Variational Geometric Constraints, then be added to
The tolerance chain of assembly P is obtained in Variational Geometric Constraints chain, according to the following formula：
In formula, DRF14, DRF15, DRF16 and DRF17 represent the Datum reference frames of part P14, P15, P16 and P17；Wherein,
ADF1 and ADF2 are belonging to 2 fitting derived characters of Same Part；RF1 and RF2 are also belonging to 2 actual spies of Same Part
Levy；Tx, Ty, Tz, Rx, Ry and Rz represent translation and the rotational freedom along 3 coordinate axess respectively, → represent from fixed reference feature
To the path of restrained feature,Represent two features coupled together by it fixed reference feature and restrained feature each other.
4. the construction method of build-up tolerance network according to claim 1, it is characterised in that in above-mentioned steps b9, press
State formula to be calculated,
In formula, DRF14, DRF15, DRF16 and DRF17 represent the Datum reference frames of part P14, P15, P16 and P17；Wherein,
ADF1 and ADF2 are belonging to 2 fitting derived characters of Same Part；RF1 and RF2 are also belonging to 2 actual spies of Same Part
Levy；Tx, Ty, Tz, Rx, Ry and Rz represent translation and the rotational freedom along 3 coordinate axess respectively, → represent from fixed reference feature
To the path of restrained feature,Represent two features coupled together by it fixed reference feature and restrained feature each other.
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| 基于分层理论和连接关系的装配结构树自动快速生成研究;王江涛等;《机械设计》;20121020;第29卷(第10期);第15-19页、表1 * |
| 基于变动几何约束网络的形位公差设计理论与方法的研究;胡洁;《中国优秀博硕士学位论文全文数据库(博士) 工程科技Ⅰ辑》;20021215(第2期);第31-64页 * |
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