The worm wheel hob in be based on example CAD system designs example library

Summary: Of the library of example of design of worm wheel hob in introducing to be based on example to design a system establish a method, of analysis, initiative to example feature example build, the feature of hob of the expression of example and organization, worm wheel builds model and its parameter to changed the crucial technology such as implementation to undertake study. Library of example of design of hob of 1 foreword worm wheel is application is based on example inference technology (Case-based Reasoning, CBR) has the base of products plan of worm wheel hob, library of example of worm wheel hob should include the hob of of all kinds worm wheel that obtained in the past to design data and design experience. The problem such as the organization of the expression that consideration and the content that solve example, example wants when building warehouse of example of worm wheel hob and example library. When the content that decides example should be included, what should consider the action that its did not come to and extraction message is convenient; Example includes to design the description of the problem and the record that devise plan not only, still include to design the information of the process; The memory structure that the organization that designs example library wants to consider example library when means. In because be in,be based on example inference technology, the status that seeks the issue solution reachs his to beg solution strategy to express with an example, accordingly, well and truly expressive design example is the fundamental premise that CBR works. To the design of worm wheel hob, because its design an object,be only one kind general, wraparound description, because the design example of hob of this worm wheel basically includes initiative condition, design,be restrained and design a result 3 parts. Among them, the initiative condition that worm wheel hob designs basically includes number of the modulus of the worm with worm wheel clench the teeth, head, law to wait for basic parameter to tooth form horn, designing a tie basically is the circumferential tine in showing hob designs a process intensity of several requirements, tooth and design technology requirement. 2 example feature analysed an example to contain substantial information, although already pressed certain principle and method to orderly ground is organized and manage, but relatively giant still and complex. In these information, not be each detail have same effect to the property of example and feature, also do not have impossibly so necessary undertake making an on-the-spot investigation to each detail of example, and should inspect those making that this example distinguishs the attribute at other example only (the main function that these attribute can generalize descriptive example and structural) , such example attribute is the diagnostic attribute of example, the gather of example feature attribute is example feature. The feature of concern plan example of example feature and example function and structure is the inspissation of example and abstraction. The diagnostic attribute that the design target of example, initiative condition, contented design tie is example and the one part that makes example feature, feature of example of this one part is example actually the design task that in producing a course, satisfies. In designing a process, gave design job, the design program that decided to arise in the future actually namely the main function of example. The attribute of another part feature in example feature is the crucial attribute that descriptive example structure can generalize in example, it is deciding what other structure attribute is worth is affirmatory, after once these are crucial property is certain, whole example frame decided (other attribute is surely really around move the) that these crucial attribute spread out. The relation of the function of example feature and example and structure is shown like right plan institute. The expression of 3 example and organized the article to put forward to prop up software environment to fall in Pro/ENGINEER, convey the method of example of worm wheel hob with the means of three-dimensional feature model. When building initiative example, the parameter that establishs worm wheel hob above all turns diagnostic model, finish in-house project database namely build the job. Because the parameter of initiative example is inputted by the user interface of application software, because this still needs custom-built interface of a data, in delivering these parameter the software that prop up; Change diagnostic model to call the parameter of the input through the parameter that establishs before, build the model of specific parameter, can finish the expression of example. The organization of example basically considers the memory structure of example. Because retrieve parameter and model file,two parts become independent relatively, reason uses the means that the retrieval of example parameter and example model departure save, namely example retrieval parameter is saved by the database, and example model protects the table of contents with specific existence to fall with the means of Pro/ENGINEER model file. Means of organization of library of this kind of example can simplify the retrieval of example library mechanism, rise retrieve efficiency. The system can maintain index and the consistency that example model conveys message from beginning to end, it basically reflects in two respects: It is on one hand revise example hind when the user, the system can revise the index of this example automatically; Should delete a record from inside index database on the other hand when, the system can delete the example of correspondence of this index place automatically. Of library of example of worm wheel hob building is to use technology of ODBC(Open Database Connectivity) to come true. Feature of hob of 4 worm wheel builds model and parameter to change implementation 4.

The general principle that 1 feature decomposes builds the diagnostic model of the product, want to undertake to the product the feature is decomposed above all, its are appearance feature mainly decompose. The general principle that the feature decomposes is: Consider the function of the product above all, decompose the product many have independent function child the gather of package feature, next will child the gather that package feature decomposes spare parts feature, decompose spare parts feature the gather of each modelling features again; Next, treat rate considering what build modular convenience and computer, should decompose the model as far as possible little feature. 4.

Feature of hob of 2 worm wheel builds model of feature of hob of worm wheel of article of calligraphy or painting model building is the parameter that in Pro/ENGINEER lieutenant general they express to be a model, after undertaking worm wheel hob the feature is decomposed, make each stature feature with certain order, be opposite at the same time these child the Boer operation that the feature has a feature, diagnostic confluence, can make worm wheel hobbing cutter three-dimensional feature model. The concrete move building a model of model of feature of worm wheel hob is as follows: Build feature of acquiescent datum plane above all. Feature of acquiescent datum plane is 3 when the system arises in acquiescent position mutual and perpendicular plane, although they are not the component of worm wheel hob, but it is main auxiliary feature however (other feature is to build what go up in datum plane child diagnostic) . Build the feature of basic circle column of hob: The diameter of feature of basic circle column is equal to the tine root round diameter of hob. Come back according to whorl to build Zun Xuan or dextral hob flute profile respectively. Of hob come back actually to change a technology to control by parameter, 3 steps establish a model under cent: Build feature of basic tooth profile: Build the basic tooth profile of odd tine above all: Hob is basic the two flank of tooth profile are by the Archimedes helicoid that circles reference circle to make helix motion form point-blank, what the rotational direction of axes decided whorl is circle to come back in helix motion to, with method of helix scanning Helical Sweep, according to the tooth form parameter of basic worm section plane, can generate the basic tooth profile of individual tine. The method that uses array Pattern next circles this tine array of column of whole basic circle to generate the basic tooth profile of whole hob. Build feature of the chamfer that hold bit: Because since of feature of chamfer of single look bits loses a feature, it is raised feature, reason uses cutting method (Cut) and raised law (Extrude) , the basis allows the section plane parameter of bits chamfer, build feature of chamfer of single look bits. Age according to the end panel of hob with array Pattern(number decides array parameter) next, single look bits chamfer feature circles array of basic circle column, finish those who contain bits chamfer feature to build namely. Build shovel back and feature of side shovel face: When building the feature that shovel a back, carry parameter on the back according to the shovel above all, build Archimedes corkscrewed yarn through equation, repass helix scanning builds shovel the reverse side, excise surplus with cutting law, get sheet discharges tine (the tine between chamfer of two looks bits discharges photograph adjacent) the feature that shovel a back. If need 2 times to shovel a back, repeat above measure. Use the method of array next, the feature shovelling a back that ages odd platoon circles array of basic circle column to all tine. When building side to shovel face feature with build the feature that shovel a back similar: Build a side to shovel a face above all, next array. Because a side shovels face feature by left, on the right side of these 3 faces comprise shovel face and the reverse side of tine root shovel, because this needs to establish these 3 ranges respectively, their confluence (Merge) becomes an area, use surplus of cutting law eliminate; Use next with the same array when building basic tooth profile array of feature of face of shovel of methodological general side arrives on all tine. 4.

The realizes hob feature information that parameter of model of feature of hob of 3 worm wheel turns stores after the model is built in the in-house project database that propping up software, although prop up software different may make diagnostic information is in the memory data texture inside the computer differs somewhat, but they can complete save diagnostic information. After hob feature model realizes parameter to change, the user can pass the parameter that inputs hob, get some the model of specific hob, these parameter are outside news of the feature. The formal memory that these exterior parameter information express with data is in Microsoft Access database. To connecting the hob of handle type, the dimension parameter of its arbor part is decided by machine tool place, still need to build gear-hobbing machine bed to install the database of parameter to hob so, use at deriving the structural parameter of arbor. To the gear-hobbing machine of different type, the structure of its arbor and dimension had realized seriation, because this needs to input the model of gear-hobbing machine only, decide relevant parameter again, can determine the structure of arbor. Of the implementation that parameter changes and model build undertake at the same time. In the process of the figure of 2 dimension section plane that builds a feature, use the relationship in menu is being pulled below Pro/ENGINEER (RELATION) option, the form of usable and variable parameter shows graphical measure, realize variable drive; In the meantime, allow to build the variable that has nothing to do with graphical dimension to regard intermediate operation as parameter, have variable operation. Relation (RELATION) option provided a basis to realize hob parameter to change, pitch of round diameter of root of the external diameter that hob builds a lot of parameter in modular process to be like hob, tine, axial and law wait to transverse tooth thickness even if in the set in RELATION option. The implementation that parameter changes is main by Pro/ENGINEER advocate the PROGRAM module in menu is being pulled below the interface will finish. Each design model has the list of a main design stage and parameter in PROGRAM module, the design list that can compile this model makes its work to be changed in order to realize parameter as a program. Of 5 example library building worm wheel hob to design example library is the base that applied CBR technology has CAD of worm wheel hob is designed. The example warehouse that the article uses establishs a method is the initiative example model that turns the method that is united in wedlock to build hob with diagnostic operation and parameter, convey the three-dimensional model of example to prop up an environment with Pro/ENGINEER software, store with the form of model file example, with the parameter of means memory example of the database. 5.

The initiative example that 1 feature and parameter spend photograph couple establishs a method initiative example is the it is good to had been built in example library example before the design that undertakes is based on example, it is to use as the primitive example model that retrieves a source. The CAD of worm wheel hob that is based on example needs the support of example library, consequently need builds the initiative example of worm wheel hob above all, the complete information of example expression is in the computer. Because library need has example to serve as the initiative example that retrieves a source a certain quantity ofly, and worm wheel hob is special cutting tool, model is numerous and the structure is complex, build a model to compare difficulty to the one by one of worm wheel hob of each model. But because all worm wheel hob are the type that connect a handle, belt,Kongshi mixes one of type of end panel key, there is same place on tooth form and structure, accordingly, the model of worm wheel hob that is like all model that appear the likelihood builds the in-house project database in the special software that prop up in, the method that set parameter adopts when need draws the share of need from inside project database, the model is built below the environment of the software that prop up, undertake be modificationed appropriately next, with respect to the model of feature of worm wheel hob that can build each model conveniently, those who avoided one by one to build a model is trival. Be based on above analysis, the article put forward to build model and parameter to change the method that is united in wedlock to build the initiative example of worm wheel hob with the feature: The parameter that establishs worm wheel hob above all turns diagnostic model, make specific worm wheel hobbing cutter through parameter input next, undertake certain modification to this hob again, get product of hob of practicable worm wheel, save its as initiative example finally. The advantage of this kind of method is: Use the method that builds a model to solve the expressive problem of example, use parameter to change a method to solve the problem building a model of hob of a variety of model worm wheel, went to the lavatory to generate and be revised of initiative example. 5.

The 2 worm wheel hob that are based on a function to decompose propose modular method products plan is to satisfy functional requirement essentially, because this wants to undertake to the function of the product above all layer upon layer decompose, form disparate arrangement of ideas child function, till yuan of function that cannot decompose again, seek at the same time contented individually yuan functional feature; The retrorse course that decomposes according to this kind of function next has these features going all out appropriately closing operating, fashion final product, this is based on the feature that the function analyses to decompose a method namely. The article used the feature that is based on functional analysis to decompose a method just about, decompose worm wheel hob the gather that is each stature feature, will decompose through diagnostic operation next those who go out child the feature undertakes assorted, built parameter of worm wheel hob to turn diagnostic model. CNC Milling