CN104239603B - A kind of three-dimensional process model generating method combined based on positive sequence backward - Google Patents
A kind of three-dimensional process model generating method combined based on positive sequence backward Download PDFInfo
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Abstract
The present invention discloses the three-dimensional process model generating method combined based on positive sequence backward in a kind of three-dimensional digital technological design field, first reads and designs a model and set up blank model；Part process information and process framework flow are built, the process model of part process frame joint is resettled, backward builds the process model of processing each stage all operation part changes, finally completes the foundation of all process steps model；The present invention realizes the support to technological design concurrent working and collaborative design, can improve the flow and its efficiency of three-dimensional process design；In three-dimensional process model generating process, the method that the design of frame joint process model positive sequence man-machine interactively and the automatic backward generation of small procedure-node process are combined is employed, all kinds of modeling softwares is supported and improves the efficiency of process model generation.
Description
Technical field
It is a kind of three-dimensional process model combined based on positive sequence backward the invention belongs to three-dimensional digital technological design field
Generation method.I.e. when three-dimensional process is designed, process model is divided into frame joint process model and sub- process model.Take just
Sequential mode, frame joint process model is built using the method for deletion or inhibitory character or model manipulation；Using backward mode, with
Frame joint process model takes the mode of synchronous auto-modeling generation to build sub- process model as input.
Background technology
With the rapid popularization and development of three-dimensional software, China's manufacturing industry has realized three-dimensional objects design substantially.But
At present in the technological design of the important ring of Digital Design and Manufacture platform, still carried out mostly based on two-dimensional engineering graphic, three-dimensional mould
Type is for reference only.Comprehensive status both at home and abroad, it can be found that technological design and Element Design have time and difference spatially
It is different, it is impossible to collaboration and concurrent working so that the lifting of the quality and efficiency of technological design runs into bottleneck.Two-dimentional process chart adds text
The technique information expression way of word description, brings substantial amounts of meaningless and repeated work so that technologist wastes
Plenty of time is with energy in the rudimentary work of the similar various forms of establishment etc., it is impossible to which wholwe-hearted processing of concentrating one's energy embodies technique and set
In the intellectual work of valuation value.The two-dimentional process chart of technological design generation is carried out in two-dimentional system, it is impossible to same with Element Design
Step association, it is the data source disunity for causing to manufacture and design, not unique, easily cause the disconnection manufactured and designed, data management and dimension
Shield increase cost.And process step design is carried out in the case where digitizing full three-dimensional environment, the three-dimensional process model of generation, three-dimensional CAPP systems are straight
Connect and carry out technological design using three-dimensional CAD model, without the multiple conversions between three peacekeepings two dimension, while can easily and intuitively refer to
Lead production process.
The generation of three-dimensional process model is realized based on full threedimensional model description manufacture information, and then is engaged in three-dimensional process and is set
The basis of meter.《The process chart based on threedimensional model is inversely generated under CAD/CAPP environment》One text elaborates one based on three-dimensional mould
The process chart automatic creation system of type, realizes the backward generation to two-dimentional process chart, but can not solve three-dimensional process model
Generation problem；A kind of Chinese patent " three-dimensional process model evolution generation method designed applied to digital process " (patent Shen
Please number：201210052303.9) elaborate it is a kind of based on the backward generation method modeled without history, available for three-dimensional process model
Generation, but this method implies the condition of serial generation process model, i.e., before step process model generation be necessarily dependent upon after
Walk the generation of process model, it is impossible to meet the requirement of concurrent collaborative；Chinese patent is " based on the three-dimensional machining for removing feature recognition
Sequence model sequence modeling method " (number of patent application：201210578397.3) elaborate that a kind of removal feature based on order is known
Other three-dimensional machining sequence model modelling approach, using selection per the procedure feature to be removed, while relying on different spies
Levy identification facility to carry out the method for man-machine interactively operation, all process steps model is set up and technique information addition is required to artificial reality
It is existing, it is impossible to meet the requirement of automation demand and technique information multiplexing；A kind of Chinese patent " structure of dynamic 3 D process modeling
Method " (number of patent application：201210178749.6) elaborate based on the dynamic 3 D technique mould on the basis of Pro/E secondary development
The method for building up of type, imply all operations must limit expanded application using Pro/E secondary development as background, and not to association
Solved with technological design.
The content of the invention
For three-dimensional process model formation efficiency present in existing three-dimensional process model generating method is relatively low, man-machine interactively
Technical problem that is more, not supporting collaboration to work asynchronously, has invented a kind of three-dimensional process model life combined based on positive sequence backward
Into method, the problem of solving the three-dimensional process model interoperability Parallel Design in Process Planning.In the three-dimensional process model
In generation method, technique process is divided into frame joint process and sub- process, is frame joint process by process model partition
Model and sub- process model, wherein frame joint process model are generated using positive sequential mode by man-machine interactively semi-automation, sub- work
Sequence model is automatically generated using backward mode, it is achieved thereby that the concurrent working of technological design, improves the efficiency of technological design；
Technique information on process model comes from priori process knowledge and the result of decision in model seed file, passes through technique information
The mode of index obtains the contents such as processing method information, allowance information and resource information, is easy to implement and manufactures and designs one
The uniform data source based on model caused；The technique required by the geometry reflected on Element Design model and manufacture is believed
Breath, builds all kinds of manufacturing feature types, can specification for feature and type management, it is ensured that part manufacture information rationally being obtained
Take, and then improve the generation quality of three-dimensional process model.
The technical solution adopted by the present invention is to have steps of：（1）Designing a model for part is read, and according to design mould
Type sets up blank model；（2）Manufacturing feature is summarized from the Modelling feature type angle of common part, to each manufacturing feature type
Corresponding manufacturing feature attribute information is defined, the definition in manufacturing feature information bank according to constructed by every class manufacturing feature
It is required that, the manufacturing feature and manufacturing feature attribute information of such part are obtained, by attribute information and feature association formation model kind
Subfile；（3）Technique information and framework flow are built based on model seed file, according to process framework flow and information, identification
The node of framework process model, obtains the technique information of each framework process model node, using deletion or suppression Modelling feature
Mode generate the process model of the process frame joint, according to described blank model and the process frame joint of identification,
Obtain the process model of preliminary each frame joint；（4）According to the process model of each frame joint, backward, which is built, works as front frame
Sub- process model before frame node is tight, then using sub- process model as input, to build the tight preceding sub- process mould of the sub- process model
Type, so circulation is until previous frame joint process model；（5）Complete the foundation of all process steps model.
Advantages and advantages of the invention：
1st, using this paper three-dimensional process model generating method combined based on positive sequence backward, technological design can be improved
Cooperative ability, realizes concurrent working；Particularly with the part of complex class, its manufacturing procedure is numerous, it is necessary to generate more three-dimensional
Process model, three-dimensional process model can be quickly generated using this method, and formation efficiency is high.
2nd, the technique information on process model comes from priori process knowledge and the result of decision in model seed file, leads to
Cross the mode of technique information index to obtain the contents such as processing method information, allowance information and resource information, be easy to implement
Manufacture and design the consistent uniform data source based on model.
3rd, the technique information required by the geometry reflected on Element Design model and manufacture, builds all kinds of manufactures special
Levy type, can specification for feature and type management, it is ensured that part manufactures the reasonable acquisition of information, and then improves three-dimensional process
The generation quality of model.
4th, the three-dimensional process model generation of part can carry out the pipe that part manufactures information data according to structured processes information
Manage, the data-linkage of the system such as convenient and PDM and ERP and MES, the data flow of specification enterprise.
5th, whole design process uses unified three-dimensional modeling data source, and the issue of technique is based on rational three-dimensional process mould
Type, it can be ensured that following process, emulation are consistent with inspection data, synchronized update is kept between each data, it is ensured that the one of information transmission
Cause property.
Brief description of the drawings
Fig. 1 is a kind of overview flow chart of the three-dimensional process model generating method combined based on positive sequence backward of the present invention；
Fig. 2 is flow chart of the present invention from Element Design model construction technique information；
Fig. 3 is the flow chart of structured processes information of the present invention
Fig. 4 is the particular flow sheet of Fig. 1 positive sequence backward combination.
Embodiment
A kind of three-dimensional process model generating method combined based on positive sequence backward proposed by the present invention, using three-dimensional process mould
The mode that type positive sequence and backward are combined, is divided into frame joint process and sub- process by technique process, is by process model partition
Frame joint process model and sub- process model, pass through the priori process knowledge and result of decision structure in reading model seed file
Build structured processes and realize that manufacturing feature, technique are corresponding with the association between modelling operability.Frame joint is created by positive sequential mode
Process model, formation efficiency is high；On the basis of frame joint process model, sub- process model is built by backward mode.Son
It is corresponding based on the association between manufacturing feature, technique and modelling operability in process model generating process, indexed by technique information
Mode obtains the contents such as processing method information, allowance information and resource information, take stretching, biasing, reconstruct, deletion,
The Geometric Modelings such as suppression driving part model, modeling parameters and Modelling feature object are by reading frame structure three-dimensional process certainly
It is dynamic to obtain, so that technique information efficiently is converted into Geometric Modeling process, generate the process model of part.As shown in figure 1, tool
Body comprises the following steps：
Step one：Designing a model for part is read, and blank model is set up according to designing a model.
When building the blank model of part, built according to the geometry topological structure and outer shape designed a model, people's industry and traffic
Mutually rule of thumb design a model and be modeled according to this, complex parts structure can use the method construct blank model of envelope,
And for certain specific class part, blank model can be generated using the modeling method automation of parametrization.
Step 2：Manufacturing feature information bank is built, and obtains manufacturing feature, model seed file is set up.
Build manufacturing feature storehouse.First from the Modelling feature type angle summary manufacturing feature of common part, such as region feature,
Hole characteristic, annular shaft, through hole etc., are then defined to the corresponding manufacturing feature attribute information of each manufacturing feature type,
The attribute information of manufacturing feature mainly include the manufacturing feature used processing method, the type of the manufacturing feature, the manufacture
The corresponding modelling operability information of feature type information, and the often size of the geometry of class manufacturing feature, form tolerance, position
The information such as tolerance.
Build the basic demand of manufacturing feature information bank：Including specific part manufacturing feature classification type and processing method
Relation rule between modelling operability, and build the relation between technological parameter and modeling parameters.Regular establishment principle is pressed
Divided according to manufacturing feature type and processing method：
Vehicle Processing is generally divided into car annular feature, car feature containing trajectory and car complex characteristic.Car annular feature, it is fixed
Justice is reconstruct adjustment toroid size modelling operability, the toroid size value in size value correspondence modeling before and after processing；Car contains track
Line feature, the tool track line of cutter is generally remained on final mask, is defined as bias operation.Car complex characteristic shows as mould
Atypical characteristic in type, is defined as stretched operation；
Milling Machining is divided into the common region feature of milling and the complicated region feature of milling, and the common region feature of milling is defined as biasing surface operation, plus
Spare time amount is the offset or dish of modelling operability.Complex characteristic face is defined as stretched operation；
Hole machined is divided into through hole feature machining, plain bore feature machining and other complicated hole characteristic processing.Processing runs through
Hole characteristic shows as hole insertion, is defined as stretched operation, and stretching distance is hole depth.Common hole characteristic is processed, is defined as deleting
Operated with hole face is suppressed.Other complicated hole characteristics are processed, such as irregular stepped hole, be defined as reconstructing or the operation of replacement face；
To define association between manufacturing feature, technique and modelling operability in model seed file corresponding for rule more than.
Definition requirement in manufacturing feature information bank according to constructed by every class manufacturing feature, obtains the manufacture of such part
Feature and manufacturing feature attribute information, attribute information contain the manufacture type of manufacturing feature, tooling step, cutting parameter, spy
Dimension information and tolerance information are levied, by attribute information and feature association, makes attribute information correspondence linked character, by the way that attribute is believed
Breath forms model seed file with feature association.
The detailed process for setting up model seed file is：1. it is several according to what is reflected on the Element Design model in modeling software
The technique information that what shape and manufacture are required, obtains the manufacturing feature of part, the manufacturing feature is matched in manufacturing feature storehouse；
2. according to the manufacturing feature matched from manufacturing feature storehouse, the related attribute information of manufacturing feature is obtained；3. according to manufacturing feature
And attribute information, manufacturing feature is associated in part one by one with attribute information, makes whole manufacturing features corresponding with attribute information
Association, obtains technique information index；4. the manufacturing feature of association is stored, as model seed file, for follow-up three-dimensional
Technological design.
Step 3：Part process information and process framework flow are formed, the process model of part process frame joint is set up.
Technique information and framework flow are built based on model seed file, as shown in Fig. 2 specific process is：1. read
Model seed file information, the processing and manufacturing feature class of the Element Design model of part series is obtained according to model seed file
Type；2. the technique for building part according to the manufacturing feature type is indexed, and sets up the process information of part framework flow nodes；3. will
Technique index information is associated to the corresponding manufacturing feature that designs a model of part, forms node manufacturing feature, technique and modeling behaviour
Make the mapping between three, Informational support is provided for follow-up process model generation.
According to process framework flow and information, the node of identification framework process model obtains each framework process model node
Technique information, using deleting or suppress to generate the process model of the process frame joint by the way of Modelling feature.According to step
The blank model and the process frame joint of identification set up in rapid one, obtain preliminary process model.
All technique informations under framework procedure-node are obtained from model seed file, and are associated with manufacturing feature, shape
Into the structured processes information under the node frame.Structured processes information as shown in figure 3, part technique using N number of process as
Multiple work steps under the process are included under the procedure-node of total process model, each process, the work step information of each work step includes adding
The processing method of work manufacture, allowance etc., the tooling step information determines that sub- process model generation operates that is taken to build
Mould method, is the important information in sub- process model construction process.
Step 4：Backward builds the process model of processing each stage all operation part changes.
The sub- process model of the step mainly before the frame joint in construction step three by the way of backward is tight.Backward structure
Building the principle of process model is：To under node frame specific work step carry out class definition, when in Process Planning to specific
Minutia defines its manufacturing feature type and processing method, manufacturing feature type and processing method is built with reverse process process
Modulo operation forms corresponding relation, is formed and calls modelling operability by reading manufacturing feature type and processing method, when manufacture is special
Levy after type change, modelling operability step synchronized update, to reach synchronized update Element Design mould shapes.
In the sub- process model process under creating subframe node, building in manufacturing feature information bank in step 2
The vertical principle for requiring to build with process model backward, the technique information according to abovementioned steps two is indexed, from model seed file
The process knowledge and the result of decision of correlation are obtained, to automate the sub- process model before generation builds the process frame joint tightly.
Determine the process model product process that positive sequence backward is combined.Three-dimensional process model positive sequence backward combination generating mode,
First by building dimensional structured frame joint technique, realize that technique index information is associated with the Element Design aspect of model, one
Aspect takes positive delete or suppression frame joint feature by the node diagnostic under identification framework.Formation process frame joint
Preliminary operation model.On the other hand according to the preliminary node process model of process framework formation, it is taken based on model seed
The index of subframe node diagnostic and technique information is set up in the technological design of file.The mode for taking backward to generate, by reading
The manufacturing feature of process block shelf node and related technological parameter, and set up using modelling operability with manufacturing feature classification information
Technique index operation rule, to realize that backward sets up process model by way of Geometric Modeling.Process block shelf node
It is as follows that process model backward creates process：By reading the preliminary operation model of this frame joint, and index this frame joint
Feature and technique information, using sub- procedure-node as operating unit, the manufacturing feature after being successively read this node manufacturing feature and being tight
The corresponding modeling geometric operation that should be taken, so circulation are until all manufacturing feature traversals of this framework child node are completed, successively
Generate the specific process model of front baffle node.The method being combined by positive sequence and backward is particularly to manufacturing procedure and mould
The complicated Element Design model of type can quickly obtain the specific process model of Element Design model；
1. the process model generation main-process stream combined using positive sequence backward using Element Design model as shown in figure 4, carried out
Three-dimensional process is designed, and builds technique information index and technique framework flow；2. build Element Design model blank model, and according to
According to technique frame information, by selection and the feature of automatic identification node process frame joint, the positive sequence deleted or suppressed is taken
Mode sequentially generates the preliminary operation model of process framework.Can automatic identification for hole class, keyway category feature；3. with current work
The preliminary operation model of sequence framework is input, using backward generating mode, reads the tight preceding child node feature of this frame joint
Technique information, takes corresponding geometry backward modeling rule to generate sub- process model, if the child node before this frame joint is tight
Process model do not generate all, then the work step information for continuing to read child node is returned to, until the son section before this frame joint is tight
Point all generations；4. necessary process annotation information is added in threedimensional model, is manufactured the information such as requirement, is made appropriate modification, i.e.,
The process model of all process steps of Element Design model can be generated.
Step 5：Complete the foundation of all process steps model.
The process task that all process steps model is described is tested, the matching degree of process model and technological requirement is entered
Performing check.The process model of generation is in order to support that follow-up visualization manufactures application, and each process model needs to be processed into individually
Model, generate corresponding visual light weighed model, the accurate driving processing model for digital control processing and examined for Numerical Control Simulation
Accurate driving testing model, and be distributed to corresponding platform, these related models all keep data correlation with process model,
Can synchronized update.
Claims (5)
1. a kind of three-dimensional process model generating method combined based on positive sequence backward, it is characterized in that having steps of：
（1）Designing a model for part is read, and blank model is set up according to designing a model；
（2）Manufacturing feature, manufacture corresponding to each manufacturing feature type are summarized from the Modelling feature type angle of common part
Characteristic attribute information is defined, the definition requirement in the manufacturing feature information bank according to constructed by every class manufacturing feature, is obtained
The manufacturing feature and manufacturing feature attribute information of such part, by attribute information and feature association formation model seed file；
（3）Technique information and framework flow are built based on model seed file, according to process framework flow and information, frame is recognized
The node of frame process model, obtains the technique information of each framework process model node, using deleting or suppress Modelling feature
Mode generates the process model of the process frame joint, according to described blank model and the process frame joint of identification, obtains
To the process model of preliminary each frame joint；
（4）According to the process model of each frame joint, backward builds the tight preceding sub- process model of front frame node, then
Using sub- process model as input, the tight preceding sub- process model of the sub- process model is built, so circulation is until previous framework section
Point process model；
（5）Complete the foundation of all process steps model.
2. the three-dimensional process model generating method combined according to claim 1 based on positive sequence backward, it is characterized in that：
Step（2）It is middle set up model seed file detailed process be：1. according to anti-on the Element Design model in modeling software
The technique information that the geometry and manufacture reflected are required, obtains the manufacturing feature of part, the system is matched in manufacturing feature storehouse
Make feature；2. according to the manufacturing feature matched from manufacturing feature storehouse, the related attribute information of manufacturing feature is obtained；3. according to system
Feature and attribute information are made, manufacturing feature is associated in part one by one with attribute information, whole manufacturing features is believed with attribute
Breath correspondence association, obtains technique information index；4. the manufacturing feature of association is stored, is used as model seed file.
3. the three-dimensional process model generating method combined according to claim 1 based on positive sequence backward, it is characterized in that：
Step（3）In, technique information is built based on model seed file and the specific process of framework flow is：1. reading model kind
Subfile information, the processing and manufacturing characteristic type of the Element Design model of part series is obtained according to model seed file；②
The technique index of part is built according to the manufacturing feature type, the process information of part framework flow nodes is set up；3. by technique
Index information is associated to the corresponding manufacturing feature that designs a model of part, forms node manufacturing feature, technique and modelling operability three
Mapping between person.
4. the three-dimensional process model generating method combined according to claim 1 based on positive sequence backward, it is characterized in that：
Step（4）In, the sub- process model is to the change of part geometry shape by reading adding for part manufacturing feature association
Work method, allowance information are modeled operation, can automate generation.
5. the three-dimensional process model generating method combined according to claim 1 based on positive sequence backward, it is characterized in that：
Step（5）The middle foundation for completing all process steps model includes：The process task that all process steps model is described is tested,
The matching degree of process model and technological requirement is tested, each process model need to be processed into single model, generation pair
Visual light weighed model, the accurate driving processing model for digital control processing and the accurate driving inspection examined for Numerical Control Simulation answered
Model, and corresponding platform is distributed to, these related models all keep data correlation with process model, can synchronized update.
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| CN105550387A (en) * | 2015-11-03 | 2016-05-04 | 徐工集团工程机械股份有限公司 | Method and system for constructing process model on the basis of parameterization |
| CN105574229B (en) * | 2015-11-03 | 2021-04-06 | 徐工集团工程机械股份有限公司 | Method and equipment for examining three-dimensional process model |
| CN106528929B (en) * | 2016-09-30 | 2019-05-17 | 南京航空航天大学 | One kind being based on dynamic machining member-modeling tree matrix intermediate process model Dynamically Announce and lightweight storage method |
| CN106981089A (en) * | 2016-12-22 | 2017-07-25 | 中国电子科技集团公司第三十八研究所 | A kind of generation method and detection method of three-dimensional values file |
| CN109840359B (en) * | 2019-01-15 | 2023-05-02 | 江苏科技大学 | Construction method of three-dimensional machining sequence model lightweight organization mode |
| CN110795835A (en) * | 2019-10-16 | 2020-02-14 | 江苏科技大学 | Three-dimensional process model reverse generation method based on automatic synchronous modeling |
| CN111767607A (en) * | 2020-05-15 | 2020-10-13 | 成都飞机工业（集团）有限责任公司 | Data transmission method for three-dimensional airplane assembly process file |
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