The converse project that is based on CAXA implements a technology

Keyword: Converse project; Curved surface reframes; CAXA; Make the developed country such as 1 foreword United States label nimble production technology quickly the strategy that 21 centuries manufacturing industry develops, also get the world go up to take seriously generally of other country gradually.

The converse project technology that regards nimble production technology as main branch provided very good support to be designed quickly and be made, it has made one of important and concise ways that manufacturing industry information delivers.

Converse project technology is accelerating a product to develop rate, reduce cost and draw lessons from and draw aspect of achievement of contemporary and new and high technology more and more show mighty power, had become people to realize the powerful weapon of product idea design and complex design.

Converse project technology basically includes to collect data, data processing, modelling and treatment to make wait for a few measure.

Among them the crucial technology that modelling is converse project.

Result from as a result of converse project technology the developed country such as the United States, the UG/PointCloud of company of the Pro / E that customarily of its modelling software is company of the Surfacer that uses American Imageware firm, PTC, EDS, the Strim 100 of French Matra company, the Trace of company of the CopyCAD of British Del-CAM company, Renishaw.

Obstacle of existence of costly, language communication, support service is less than the price of CAD/ CAM application software of these foreign original, issue of inadequacy of Training Within Industry, technology communicates inconvenience, and the standard that designs with our country project, constructive method and project habit differ somewhat, the development of project technology personnel that gives our country the company and application bring huge inconvenience.

Oneself pass long-term survey and practice, use Chinese northing - the CAXA of sea Er makes engineer software (CAXA of the following abbreviation) reframe curved surface, create NC program, can better land finishs the model of the spare parts, and easy control.

Limited company of software of northing sea Er and development of group of Qingdao sea Er roll out CAXA, its modelling method cent is 3 kinds big, namely line wearing, curved surface and substance.

Method of these 3 kinds of modelling has distinguishing feature each, OK and independent modelling, also can mix modelling, offerred contrail of cutting tool of 12 kinds of CNC Machining to create a method, form capacity of powerful, economic treatment process designing, enough copes with plane and the treatment of all sorts of complex curved surface, want to machine the curved surface that come out by 3 axes mill only, CAXA can undertake cutting tool contrail is generated and generate the NC code of CNC Machining automatically, undertake on numerical control machine tool cutting is machined directly thereby.

The article converse engineering design with the surface outside one plastic housing, make for exemple, use coordinate of AERS3 of Italian COORD3 company to measure machine collect data, the CopyCAD software system that uses British DELCAM firm processes data, guide Chinese northing - the CAXA of sea Er reframes curved surface, create NC program, make what implement a part thereby quickly.

2 converse projects and its flow are converse the flow of the project is to use 3D digitlization to measure an instrument above all normally accurate, apace measures an existing workpiece (sample or model) outline coordinate, repass all sorts of software undertake building compose, editor to curved surface, revise, pass to CAM system, create NC program, send to CNC to machine a machine tool to make place need a mould finally, or send fast forming machine (Rapid Prototyping) make sample model.

Its technological process is shown 1 times like the graph.

Among them, three-dimensional data is measured, the 3 old crucial techniques that data processing, curved surface reframes is converse project.

The article also basically is analysed around these 3 respects.

Of 3 three-dimensional data collect in converse project, the accurate, fast, three-dimensional geometry data that gets in kind in the round is the foundation that implements converse project.

As the development that conducts feeling technology, control technology, production technology, appeared various data collect a means, basically have contact, blame contact and destroy form 3 kinds big, among them representative data collects equipment to 3 coordinate are measured machine (CMM) , optical scanner and fault scanner.

This second measure the 3 coordinate that used AERS of Italian COORD3 company machine, grow through be opposite 49 Mm, wide 120.

8 Mm, tall 74.

The surface outside the plastic housing of 7 Mm undertakes much to orderly scanning, scanning dot amounts to 10 339, get data nods the cloud.

This bits of Yun Yiwen this file format (.

Txt) save file to disk, can offer CopyCAD (graph 2) , the application software such as Pro / E, UG is used.

The key that data processing of 4 data processing is converse project one pace, its handle the effect to will affect the quality that later period model reframes directly.

This design uses the most concise method, pass interactive differentiate namely apparently bad place, nod bad place, noise purify next.

To the feature of curved surface then line of dot, feature undertakes deciding, obtain satisfactory curve, arrange processing solely, reframe for next curved surface good preparation.

Consider CAXA cannot read the document nodding the cloud that takes text form directly, and when the software such as Pro / E, UG reads data of cloud extraction a place, because data is voluminous,also meet, cause certain difficulty.

When CopyCAD reads the data such as cloud extraction a place, systematic job rate is rapidder, it is easy that dot line plans to close, because this data processing chooses,undertake in CopyCAD.

Particular operation move is as follows: In CopyCAD software, use the Point Editing in standard tool column, pitch on deletes bad place, click Triangle Generation, with its child the Triangulation Wizard of tool column makes triangular model; Use Model Editing, limitative model periphery is redundant triangle; Click Triangle Editing again, pitch on deletes bad triangle, end up with place requires triangular model (graph 3) .

Click the Curve Generation in standard tool column, use the curve such as Boundaries, Horizonline, Discontinuities, Scan Lines or Triangle ModelCross Section to make way, generate curved surface to reframe needs diagnostic curve.

Click Curve Editing finally, with its child the Curve Smoothing of tool column undertakes light arranges processing.

To make the curved surface of next CAXA reframes in can reframe a light the curved surface of minimum of suitable, error, we still must get enough diagnostic curve by CopyCAD (graph 4) , save for curvilinear file (.

Igs file) .

5 curved surface reframe those who have a side when planning to close, the tool that CopyCAD place provides is less, and the quality of the face is not high.

In a lot of moment, the face of its make it, constant need is revised in software of PowerMILL, PowerSHAPE.

The face quality that Pro /E, UG does is higher, but software use difficulty is great.

Integrated consideration, we choose CAXA to reframe curved surface.

Afore-mentioned curvilinear files that derive by CopyCAD are opened in CAXA (.

Igs file) , use its attrib border face, reseau face, lofting face, guide move the curved surface tool such as the face to undertake distributing a curved surface model, curved surface of the juniorest travel transfers, the operation such as joining together, suture, form ideal curved surface.

The every feature line that CopyCAD guides, CAXA considers as independent curve, and on-line can use the closest dot at each o'clock to undertake catching.

More important is, modelling of CAXA curved surface does not need draft, the every feature line that because this guides,joins can be used directly commonly reframe curved surface.

When be like certain feature line not to accord with condition of curved surface modelling (wait like end to end of curve of demand of attrib border area) , can undertake to them the curve cuts out is like conveniently, transfer, interrupt, combination, outspread, delete wait for editor processing.

Of course, also can carry the kind that catch an aspect, use curvilinear tool, wait for heavy draw curve like line of linear, circular arc, round, batten.

Because the curve is,guide by CopyCAD or nod scale through catching the diagnostic on-line that guides, because this wants to control error of good feature line in CopyCAD only, can get the curved surface with very small error handily (graph 5) .

The most depressed thing nothing is more... than was encountered to expend very great strength to build the curved surface that go out to be arranged solely far from in modelling.

The author's result is: Certain the curve that guides because the reason of itself, or in guide the data in the process is lost cause not only suitable, can use batten curve tool at this moment, use the end points, closest dot to catch bit of new scale on former curve.

This also is the reason that why I emphasize wanting to acquire enough feature line in CopyCAD (little bad to fill, much can delete) .

The amount that catchs an aspect and position need to decide through experience, premise is to make sure light is suitable reach an error small.

If want to examine,the light of curved surface arranges degree, can put curved surface into * .

Igs file, undertake in Pro / E chromatic curvature is analysed again (graph 6) .

6CNC Machining CAXA can undertake fictitious CNC Machining to curved surface directly.

Click entree sheet first " application " neutron menu " orbit is generated " , means of knife of dosage of parameter of the treatment kind with right choice, treatment, cutting tool, cutting, advance and retreat, generate treatment contrail (graph 7) ; Click again child menu " orbit edits " , undertake a knife cut out, retrorse, insert, delete wait for the interruption of processing and contrail, join, parameter to revise wait for an editor.

Click finally child menu " orbit is emulated " , undertake emulation machining (graph 8) , click again after observation is satisfactory child menu " postposition is handled " , generate, code of school nucleus G and make planning sheet, classics handiwork is revised, debug, examine send to machine of cut of electric spark line or machining center treatment.

When 7 last words make converse project curved surface reframe with CAXA, overall it is handy, good to feel to compare with.

Divide outside having the characteristic with powerful function of curved surface modelling like Pro / E, still have the following and clear advantage.

Above all, the diagnostic curve that CopyCAD software derives, pro / E considers as a whole, cannot be opposite directly among them the edition that line has becoming independent.

And the start that approves a curve only or terminus, the others nods an entirely to be not known, to scale freedom curve, found free curved surface to bring inconvenience.

CAXA thinks every curve that guides is an independent object, can have all sorts of editions directly, and all sites that approve a curve to go up.

Secondly, pro / E divides scale freedom curve, found free curved surface not to need to found draft, the curved surface modelling of the others must follow the prescribed order, make draft plane, reference first fiducial, found draft again, final ability generates curved surface, process loaded down with trivial details, very tall to dimensional concept requirement.

CAXA makes a range, beardless draft, can use the diagnostic curve that guides to reframe directly especially curved surface, undertake imitate CNC Machining.

Of a blemish in an otherwise perfect thing is, in CAXA, the curved surface facial expression of apply colours to a drawing is drab, dry, lack module of analyse of divide into equal parts of suitable to curved surface light, error.

Additional, the NC program that its create automatically needs a large number of manual modification, debug rear can use.

CNC Milling CNC Machining