catia曲面快速重建PPT.ppt

1 曲面快速重建曲面快速重建Quick Surface ReconstructionCATIA 逆向工程逆向工程 2用户界面用户界面 3数字模型数字模型创建创建 Free Form surfaces拉伸曲面拉伸曲面修剪修剪一般过程一般过程倒角倒角 4数字模型数字模型Identify mechanical features一般过程（另一般过程（另1）5Create ScansCreate CurvesProcess curves一般过程一般过程(另另2)Create surfaces 6创建创建Scans使用曲率分析使用曲率分析Define the curvature or radius value or select a point of the polygonDefine the analysis typeIso-curvature displayReal-time display of curvature value at cursor positionThis function creates scans composed of the points where the curvature or curvature radius of the polygon has a given value 7创建创建Scans使用曲率分析使用曲率分析(2/3)Define a filtering valueFiltering value set to 500Filtering value set to 0 8创建创建Scans使用曲率分析使用曲率分析(3/3)Split of the polygone by the isocurvature scansCreation of isocurvature scans 9Using isoslope computation(1/2)Define the angle valueDefine the compass orientationThis function creates scans composed of the points where normal to the polygon has a given angle with the compass direction.10Using isoslope computation(2/2)Creation of the isoslope scanSplit of the polygon by the isoslope scan 11创建曲线创建曲线修整修整 scans创建创建 3D 曲线曲线修剪不相交曲线修剪不相交曲线清理轮廓清理轮廓 12修整修整 scans(1/2)定义精度定义精度Define manually splitting points on the scanDefine the order of each curves span通过修整通过修整 scan创建曲线创建曲线Define the maximum number of spans for each curveDefine a smoothing factor if necessaryDefine an angle value for automatic splitting 13修整修整 scans scans(2/2)Define the continuity level between two consecutive curvesRemove a splitting point 14Creating a 3D curve(1/3)Define creation option:Select points on the cloudConstraint point to snap it on the digitAdd a pointRemove a point 15Creating a 3D curve(2/3)Move the manipulator to define the connection point if the curves point is on another curve.Activate the tangency definition at a point 16Creating a 3D curve(3/3)Define the tangency direction at a point using the green circlesMake the curve tangent to the neighbour curve 17Trimming non intersecting curvesSelect the curves to process(Curves must not need extrapolation to find an intersection)Define the maximum distance between two curves to consider an intersectionDefine the maximum length of the created curves(optional)18Cleaning contourSelect the curves to processImpose the function to create a closed contour if necessaryActivate the tangency continuity constraint Define the maximum angle to activate the tangency constraintDefine if the curve is fixed or free 19创建曲面创建曲面创建规范曲面创建规范曲面创建自由曲面创建自由曲面 20创建规范曲面创建规范曲面(1/3)Activate the automatic mode for an automatic recognition of a canonical shapeInformation about the recognize featureThis function identifies a canonical surface from a set of digitized points.21创建规范曲面创建规范曲面(2/3)Choose the expected canonical shape if this one is knownDefine known information about the feature if availableDefine the orientation of the feature if it is a planeDefine the size of the feature if it is a plane 22创建规范曲面创建规范曲面(3/3)Edit the feature after its creation to keep only the necessary part 23创建自由曲面创建自由曲面(1/5)Select points only to take advantage of the fitting capabilities onlyThis function combines the power of a filling function and a fitting function.Result consists in a large surface covering the selected points 24创建自由曲面创建自由曲面(2/5)Select points and boundary curves to take advantage of both fitting and filling capabilitiesResult consists in a trimmed surface covering the selected pointsDefine the expected continuity level for each boundary curve 25创建自由曲面创建自由曲面(3/5)Define maximum deviation expected between the final surface and the selected pointsDefine the boundary curvesDefine the cloud of pointsDefine the boundary use:Constraint:the surface has to pass thru the curves and is trimmed by the curvesTrim:the surface is computed only by fitting the points.Boundary curves are then projected on the surface and the surface is trimmed by the projection.Selection:only the points located inside the boundary curves will be used for fitting.No trimming operation will be operated on the final surface.26创建自由曲面创建自由曲面(4/5)Define an initialisation surface if required.The created surface will respect the parametrisation of the init surface.Activate the display of the deviation spikes and define the minimum deviation displayed 27创建自由曲面创建自由曲面(5/5)Define the maximum order for each span of the created surfaceDefine the maximum number of spans for the created surfaceAsking for one span when filling a four-sided area will produce a single patch.Define the maximum distance between the created surface and the boundary curvesDefine the maximum tangency defect between to contiguous surfacesActivate this option to ignore points located in a pipe around the boundary curvesDefine the pipe radius Define the surface tensionInformation about the created surface