CATIA V5自学教程3.docx

CATIA V5自学教程3.docx

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CATIAV5自学教程3

曲面上的点OnSurface

在曲面上建立点。

圆心点CircleCenter

可以在圆形图中的中心位置建立点

曲线切点TangentOnCurve

在直线与曲线相切处建立点。

中间点Between

在两点的连线上建立一点，Ratio代表点与两点之间距离的倍数。

1.直线Line

提供在空间建立直线的功能，系统提供数种具体的建立方式。

对话框中的Start与End为直线向两点以外延伸的长度。

☐两点连线Point－Point

☐起点与方向Point－Direction

☐与曲线垂直或倾斜Angle/Normaltocurve

☐与曲线相切Tangenttocurve

☐与曲面垂直Normaltosurface

☐平分线Bisecting

2.平面Plane

提供建立不同于XY、YZ、ZX的平面，来作为绘制图形或实体的参考。

平面的建立方式有许多种，在下面一一讨论：

☐偏移平面Offsetfromplane

☐平行某一面且过一点Parallelthroughpoint

☐与平面垂直或倾斜Angle/Normaltoplane

☐三点成面Throughthreepoints

☐两线成面Throughtwolines

☐点与直线成面ThroughPointandline

☐过平面曲线ThroughPlanarCurve

☐与线垂直NormalToCurve

☐与曲面相切TangenttoSurface

☐方程式Equation（Ax+By+Cz=D）

☐多点的平均面MeanThroughPoints

5.11AdvancedReplicationTools工具栏

PowerCopy的用途在于将一群相关的特征组成一个集合，这个集合可以用在不同的零件文件中。

PowerCopy能进一步修改每一个特征的值，并采用参数化设计的概念，比起样本只能单纯复制特征，PowerCopy的功能更为强大。

1.PowerCopy命令

2.InstantiateFromDocument命令

5.12坐标轴系统AxisSystem

Thistaskexplainshowtodefineanewthree-axissystemlocally.Therearetwowaysofdefiningit:

eitherbyselectinggeometryorbyenteringcoordinates.

1.SelecttheInsert->AxisSystem...commandorclicktheAxisSystemicon.

TheAxisSystemDefinitiondialogboxisdisplayed.

注意：

选择对话框中的“Current”按钮，则当前建立的坐标系为当前坐标系。

2.Anaxissystemiscomposedofanoriginpointandthreeorthogonalaxes.Forinstance,youcanstartbyselectingthevertexasshowntopositiontheoriginoftheaxissystemyouwishtocreate.Theapplicationthencomputestheremainingcoordinates.Bothcomputedaxesarethenparalleltothoseofthecurrentsystem.一个坐标轴系统是由一个原点和三条直角轴组成。

例如，可以选择一个顶点作为所希望建立坐标轴系统的的原点，则系统自动计算其余的坐标轴，缺省的是所计算的轴与当前系统的坐标轴平行。

I.原点Origin

Insteadofselectingthegeometrytodefinetheoriginpoint,youcanuseoneofthefollowingcontextualcommandsavailablefromtheOriginfield:

⏹CreatePoint:

formoreinformation,refertoPoints

⏹Coordinates:

formoreinformation,refertoPoints

⏹CreateMidpoint:

theoriginpointisthemidpointdetectedbytheapplicationafterselectionofageometricalelement.

⏹CreateEndpoint:

theoriginpointistheendpointdetectedbytheapplicationafterselectionofageometricalelement

II.坐标轴系统类型AxisSystemType

Youcanchoosefromdifferenttypesofaxissystem:

⏹

Standard:

definedbyapointoforiginandthreeorthogonaldirections（bydefaultthecurrentdirectionsoftheccompass）.通过一个原点和三条直角方向（缺省与指南针方向相同）

Hereonlythepointwasselectedandnothingspecifiedfortheaxes.在这里，只选择了一个点，没有指定轴。

⏹

Axisrotation:

definedasastandardaxissystemandaanglecomputedfromaselectedreference.定义方式如同标准轴系统（StandardAxisSystem），并且利用一个选定的参考来计算一个角度。

HeretheYaxiswassettothestandardaxissystemYaxis,anda15degreesanglewassetinrelationtoanedgeparalleltotheXaxis.这里Y轴的设置方式如同标准轴系统Y轴的设置方式，15度表示绕X轴转动的角度。

（操作方式：

选定一轴；然后选定过此轴的面作为参考；在设定围绕此轴的转角即可。

）

⏹Eulerangles:

definedbythreeanglevaluesasfollows.

Angle1=（X,N）

arotationaboutZtransformingvectorXintovectorN.

Angle2=（Z,W）

arotationaboutvectorNtransformingvectorZintovectorW.

Angle3=（N,U）

arotationaboutvectorW.

3．Ifyouarenotsatisfiedwithxaxis,forinstanceclicktheXaxisfieldandselecttheedgeasshowntodefineanewdirectionforxaxis.

Thexaxisbecomescolinearwiththisedge.

4．ChecktheReverseoptiontoreversethexaxisdirection.Clickingtheaxisreversesitsdirectiontoo.

Notethattherearetwotypesofaxissystems,right-handedandleft-handed.ThedialogboxindicatesthetypeclosetotheCurrentoption.

5．Theapplicationalsoletsyoudefineaxesthroughcoordinates.

Right-clicktheYAxisfieldandselecttheCoordinates...contextualcommand.TheYAxisdialogboxappears.

6．完成原点与坐标轴的建立之后，点击OK。

Theaxissystemiscreated.Itisdisplayedinthespecificationtree.Whenitissetascurrent,itishighlightedasshownbelow.（当它设置为当前坐标系的话，它在树中显示的亮的。

）

设置的局部坐标系时固定的，如果项约束它，则先要使它与系统的其它要素隔离开，否则会过约束。

（Localaxesarefixed.Ifyouwishtoconstrainthem,youneedtoisolatethem（usingIsolate隔离contextualcommand）beforesettingconstraintsotherwise（否则）youwouldobtainover-constrainedsystems.）

Thedisplaymodeoftheaxesisdifferentdependingonwhetherthethree-axissystemisright-handedorleft-handedandcurrentornot.

Right-clickAxisSystem.1andselecttheSetascurrentcontextualcommand.AxisSystem.1isnowcurrent.Youcanthenselectplanexyforinstance,todefineasketchplane.

III.编辑一个坐标系统EditinganAxisSystem

Youcanedityouraxissystembydouble-clickingitandenteringnewvaluesinthedialogboxthatappears.Youcanalsousethecompasstoedityouraxissystem.Formoreaboutthecompass,refertoCATIA-InfrastructureUser'sguideVersion5.

Notealsothateditingthegeometricalelementsselectedfordefiningtheaxesortheoriginpointaffectsthedefinitionoftheaxissystemaccordingly.

Right-clickingAxisSystem.Xobjectinthespecificationtreeletsyouaccessthefollowingcontextualcommands:

⏹Definition...:

redefinestheaxissystem

⏹Isolate:

setstheaxissystemapart（分开）fromthegeometry

⏹SetasCurrent/SetasnotCurrent:

defineswhethertheaxissystemisthereferenceornot.

IV.CreatinganAxisSystemwhenCreatingaNewPart

Anoptionletsyoucreateanaxissystemwhenyouarecreatinganewpart.Toknowhowtoaccessthisoption,refertoCustomizingaCATPartdocument.

5.13测量Measuring

测量工具条MeasureToolbar

，包括三种测量类型：

MeasureMinimumDistancesandAngles:

Clickthisicon,setthedesiredmeasuretype,themeasuremodeandselectasurface,edgeorvertex.

MeasureProperties:

Selectthedesireditemandclickthisicon.

MeasureInertia:

Clickthisiconandselectthedesireditem

1.测量距离和角度MeasuringDistances&AnglesbetweenGeometricalEntities

Thistaskexplainshowtomeasureminimumormaximumdistancesand,ifapplicable,anglesbetweengeometricalentities（points,surfaces,edges,verticesandentireproducts）.

（1）测量类型measuretype：

⏹Between（defaulttype）:

measuresdistanceand,ifapplicable,anglebetweenselecteditems.

⏹Chain

:

letsyouchainmeasureswiththelastselecteditembecomingthefirstselectioninthenextmeasure.

⏹Fan

:

fixesthefirstselectionasthereferencesothatyoualwaysmeasurefromthisitem.

（2）DefiningSelection1&Selection2Modes：

Anygeometry（defaultmode）:

measuresdistancesand,ifapplicable,anglesbetweendefinedgeometricalentities（points,edges,surfaces,etc.）.

Note:

TheArccentermodeisactivatedinthisselectionmode.

（3）DefiningtheCalculationMode：

⏹Exactelseapproximate（defaultmode）:

measuresaccessexactdataandwhereverpossibletruevaluesaregiven.Ifexactvaluescannotbemeasured,approximatevaluesaregiven（identifiedbya~sign）.

⏹Exact精确:

measuresaccessexactdataandtruevaluesaregiven.Notethatyoucanonlyselectexactitemsinthegeometryareaorspecificationtree.

Incertaincases,inparticularifproductsareselected,awarningdialogboxinformsyouthattheexactmeasurecouldnotbemade.

⏹Approximate近似:

measuresaremadeontessellatedobjectsandapproximatevaluesaregiven（identifiedbya~sign）.

（4）CustomizingYourMeasure

Youcan,atanytime,customizethedisplayoftheresultsinboththegeometryareaandthedialogbox.

Todoso,clickCustomize...intheMeasureBetweendialogboxandsetyourdisplayintheMeasureBetweenCustomizationdialogbox.

Note:

Measuringminimumdistance,maxiumdistanceandmaximumdistancefrom1to2aremutuallyexclusiveoptions.Eachtimeyouchangeoption,youmustmakeyourmeasureagain.

Point1andpoint2givethecoordinatesofthetwopointsbetweenwhichthedistanceismeasured.

2.测量MeasureItem

用于测量选择元素的特性。

Thistaskexplainshowtomeasurethepropertiesassociatedtoaselecteditem（points,edges,surfacesandentireproducts）.

（1）定义Selection1模式（DefiningtheSelection1Mode）

⏹Anygeometry（defaultmode）:

measuresthepropertiesoftheselecteditem（point,edge,surfaceorentireproduct）.

⏹Pointonly:

measuresthepropertiesofpoints.Dynamichighlightingislimitedtopoints.

⏹Edgeonly:

measuresthepropertiesofedges.Alltypesofedgearesupported.

⏹Surfaceonly:

measuresthepropertiesofsurfaces.

Inthelastthreemodes,dynamichighlightingislimitedtopoints,edgesorsurfacesdependingonthemodeselected,andisthussimplifiedcomparedtotheAnygeometrymode.

（2）定义计算模式DefiningtheCalculationMode

⏹Exactelseapproximate（defaultmode）:

measuresaccessexactdataandwhereverpossibletruevaluesaregiven.Ifexactvaluescannotbemeasured,approximatevaluesaregiven（identifiedbya~sign）.

⏹Exact:

measuresaccessexactdataandtruevaluesaregiven.Notethatyoucanonlyselectexactitemsinthegeometryareaorspecificationtree.

Incertaincases,inparticularifproductsareselected,awarningdialogboxinformsyouthattheexactmeasurecouldnotbemade.

⏹Approximate:

measuresaremadeontessellatedobjectsandapproximatevaluesaregiven（identifiedbya~sign）.

ClickCustomize...intheMeasureItemdialogboxtoseethepropertiesthesystemcandetectforthevarioustypesofitemyoucanselect.Bydefault,youobtain:

3.测量惯性距MeasureInertia

Thistaskexplainshowtomeasuretheinertiapropertiesofanobject.

Youcanmeasuretheinertiapropertiesofbothsurfacesandvolumes,aswellasretrievethedensityorsurfacedensityifvaluatedfromV4modeltypedocuments.YoucanalsoretrieveinertiaequivalentssetinKnowledgewareformulas.

Thearea,density,massandvolume（volumesonly）oftheobjectarealsocalculated.

Measuresarepersistent:

aKeepMeasureoptionintheMeasureInertiadialogboxletsyoukeepthecurrentmeasureasafeatureinthespeci