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1、 SheetMetal Design Users Guide Version 5 Release 16 1Page SheetMetal Design Version 5 Release 16 Special Notices CATIA is a registered trademark of Dassault Systmes. Protected by one or more U.S. Patents number 5,615,321; 5,774,111; 5,821,941; 5,844,566; 6,233,351; 6,292,190; 6,360,357; 6,396,522; 6
2、,459,441; 6,499,040; 6,545,680; 6,573,896; 6,597,382; 6,654,011; 6,654,027; 6,717,597; 6,745,100; 6,762,778; 6,828,974; 6,904,392 other patents pending. DELMIA is a registered trademark of Dassault Systmes. ENOVIA is a registered trademark of Dassault Systmes. SMARTEAM is a registered trademark of S
3、marTeam Corporation Ltd. Any of the following terms may be used in this publication. These terms are trademarks of: JavaSun Microsystems Computer Company OLE, VBScript for Windows, Visual Basic Microsoft Corporation IMSpostIntelligent Manufacturing Software, Inc. All other company names and product
4、names mentioned are the property of their respective owners. Certain portions of this product contain elements subject to copyright owned by the following entities: Copyright Dassault Systemes Copyright Dassault Systemes of America Copyright D-Cubed Ltd., 1997-2000 Copyright ITI 1997-2000 Copyright
5、Cenit 1997-2000 Copyright Mental Images Gmbh Use the arrow displayed on each edge to locally invert only one edge. 179Page SheetMetal Design Version 5 Release 16 5. Click Cancel Selection then, make sure that both Convex Edge(s) and Concave Edge(s) buttons are checked, and click the Select All butto
6、n. All sharp edges of the part are selected, the Select All button taking into account the chosen type (convex, concave, or both) and the chamfers previewed. 6. Click OK in the dialog box. All sharp edges of the part are cut off or filled in. 180Page SheetMetal Design Version 5 Release 16 To deselec
7、t an edge, simply click it again. For quick selection in a complex part, you can select all edges with the Select All button, then deselect one or two edges. G When you select an edge that is not sharp, such as the edge between a wall and a bend for example, a warning is issued. G As you select more
8、 edges, the Edge(s) field of the dialog box is updated. G When using the Select All button, you select all edges (whether concave, convex, or both) present at the time. If when modifying the Sheet Metal part, new edges are created, these will not be automatically chamfered. 181Page SheetMetal Design
9、 Version 5 Release 16 Mapping Elements This task shows how to create curves or points from a sketch (as designed using the Sketcher) or from existing curves or points, onto a Sheet Metal part; and to fold/unfold it, just as other Sheet Metal elements. This is especially useful when: G you want to ge
10、nerate a logotype G you want to define an area for chemical milling G you want to create a cutout (pocket) to solve the overlapping of walls for example (the overlapping can be checked with the Sheet Metal Production product). Open the Mapping1.CATPart document. These samples already contain a pre-d
11、efined sketch that will be mapped onto the part. Otherwise, you would need to defined a sketch by entering the Sketcher workbench , selecting the wall onto which the curve should lie, and drawing the sketch you wish. 1. Make sure the sketch is selected, and click the Point or Curve Mapping icon . Th
12、e Elements To Map definition dialog box is displayed, indicating which elements have been selected for mapping. 182Page SheetMetal Design Version 5 Release 16 You can manage the list of elements: G to remove an element, select it from the list and use the Clear selection contextual menu G to add an
13、element, select it directly in the geometry. Order in the list does not matter. 2. Select the Mapping Context, that is the element of the part on which the curve should be generated when folding or unfolding. The Mapping Context is not necessarily the support element on which the element to be mappe
14、d has been drawn. Indeed, by default, the Mapping Context is the last Sheet Metal feature that has been created or modified, that is the current feature in the specification tree. 3. Click OK. The curve mapping is created and added in the specification tree. Folded view of the curve mappingUnfolded
15、view of the curve mapping 183Page SheetMetal Design Version 5 Release 16 G You can select several sketches/curves/points to be mapped at a time. G Mapped curves can be created across several walls and bends. 184Page SheetMetal Design Version 5 Release 16 Saving As DXF This task shows how save the ge
16、nerated geometry as a DXF document. To perform this scenario, you can open any sheet metal sample provided in this users guide. 1. Click the Save As DXF icon . The Select a DXF file dialog box is displayed allowing you to navigate to the correct location. 2. Indicate the correct path and file name (
17、we saved it as PartSavedAsDXF.dxf). 3. If needed, modify the Tolerance with the up and down arrows. The Tolerance is used to compute circles and lines. The thinner the Tolerance is, the better circles and lines are represented in the drawing. 185Page SheetMetal Design Version 5 Release 16 DXF file s
18、aved with a 0,001mm toleranceDXF file saved with a 10mm tolerance 2. Click Save. The geometry has been saved, and can be imported as a DXF file in any system supporting this type. 4. Close the CATPart Document. 5. Click File - Open. 6. From the File Selection dialog box, choose the .dxf file type, t
19、hen select the saved part (PartSavedAsDXF.dxf). 186Page SheetMetal Design Version 5 Release 16 7. Click Open. The unfolded view of the part is opened within the Drafting workbench, because the .dxf type is recognized as being a drafting type of document. 187Page SheetMetal Design Version 5 Release 1
20、6 Note that the axes of bends and planar hems, tear drops, or flanges are automatically displayed on the drawing. Refer also to DXF/DWG Settings from the Infrastructure Users Guide. 188Page SheetMetal Design Version 5 Release 16 Interoperability With Wireframe Creating Points Creating Lines Creating
21、 Planes 189Page SheetMetal Design Version 5 Release 16 Creating Points This task shows the various methods for creating points: G by coordinates G on a curve G on a plane G on a surface G at a circle/sphere center G tangent point on a curve G between Open the Points3D1.CATPart document. 1. Click the
22、 Point icon . The Point Definition dialog box appears. 2. Use the combo to choose the desired point type. A new lock button is available besides the Point type to prevent an automatic change of the type while selecting the geometry. Simply click it so that the lock turns red . For instance, if you c
23、hoose the Coordinates type, you are not able to select a curve. May you want to select a curve, choose another type in the combo list. Coordinates 190Page SheetMetal Design Version 5 Release 16 G Enter the X, Y, Z coordinates in the current axis-system. G Optionally, select a Reference Point. The co
24、rresponding point is displayed. G When the command is launched at creation, the initial value in the Axis System field is the current local axis system. If no local axis system is current, the field is set to Default. Whenever you select a local axis system, the points coordinates are changed with r
25、espect to the selected axis system so that the location of the point is not changed. This is not the case with points valuated by formulas: if you select an axis system, the defined formula remains unchanged. This option replaces the Coordinates in absolute axis-system option. If you create a point
26、using the coordinates method and an axis system is already defined and set as current, the points coordinates are defined according to current the axis system. The current local axis system must be different from the absolute axis. On curve 191Page SheetMetal Design Version 5 Release 16 G Select a c
27、urve. G Optionally, select a reference point. If this point is not on the curve, it is projected onto the curve. If no point is selected, the curves extremity is used as reference. G Select an option point to determine whether the new point is to be created: H at a given distance along the curve fro
28、m the reference point H a given ratio between the reference point and the curves extremity. G Enter the distance or ratio value. If a distance is specified, it can be: H a geodesic distance: the distance is measured along the curve H an Euclidean distance: the distance is measured in relation to the
29、 reference point (absolute value). The corresponding point is displayed. It is not possible to create a point with an euclidean distance if the distance or the ratio value is defined outside the curve. You can also: I click the Nearest extremity button to display the point at the nearest extremity o
30、f the curve. I click the Middle Point button to display the mid-point of the curve. Be careful that the arrow is orientated towards the inside of the curve (providing the curve is not closed) when using the Middle Point option. G use the Reverse Direction button to display: H the point on the other
31、side of the reference point (if a point was selected originally) H the point from the other extremity (if no point was selected originally). G click the Repeat object after OK if you wish to create equidistant points on the curve, using the currently created point as the reference, as described in C
32、reating Multiple Points and Planes in the 192Page SheetMetal Design Version 5 Release 16 Wireframe and Surface Users Guide. You will also be able to create planes normal to the curve at these points, by checking the Create normal planes also option, and to create all instances in a new geometrical s
33、et by checking the Create in a Body option. If the latter option is not checked, instances are created in the current geometrical set. H If the curve is infinite and no reference point is explicitly given, by default, the reference point is the projection of the models origin H If the curve is a clo
34、sed curve, either the system detects a vertex on the curve that can be used as a reference point, or it creates an extremum point, and highlights it (you can then select another one if you wish) or the system prompts you to manually select a reference point. Extremum points created on a closed curve
35、 are aggregated under their parent command and put in no show in the specification tree. On plane 193Page SheetMetal Design Version 5 Release 16 G Select a plane. H If you select one of the planes of any local axis system as the plane, the origin of this axis system is set as the reference point and
36、 featurized. If you modify the origin of the axis system, the reference point is modified accordingly. G Optionally, select a point to define a reference for computing coordinates in the plane. H If no point is selected, the projection of the models origin on the plane is taken as reference. G Optio
37、nally, select a surface on which the point is projected normally to the plane. H If no surface is selected, the behavior is the same. Furthermore, the reference direction (H and V vectors) is computed as follows: With N the normal to the selected plane (reference plane), H results from the vectorial
38、 product of Z and N (H = ZN). If the norm of H is strictly positive then V results from the vectorial product of N and H (V = NH). Otherwise, V = NX and H = VN. Would the plane move, during an update for example, the reference direction would then be projected on the plane. G Click in the plane to d
39、isplay a point. 194Page SheetMetal Design Version 5 Release 16 On surface G Select the surface where the point is to be created. G Optionally, select a reference point. By default, the surfaces middle point is taken as reference. G You can select an element to take its orientation as reference direc
40、tion or a plane to take its normal as reference direction. You can also use the contextual menu to specify the X, Y, Z components of the reference direction. G Enter a distance along the reference direction to display a point. G Choose the dynamic positioning of the point: H Coarse (default behavior
41、): the distance computed between the reference point and the mouse click is an euclidean distance. Therefore the created point may not be located at the location of the mouse click (see picture below). The manipulator (symbolized by a red cross) is continually updated as you move the mouse over the
42、surface. 195Page SheetMetal Design Version 5 Release 16 H Fine: the distance computed between the reference point and the mouse click is a geodesic distance. Therefore the created point is located precisely at the location of the mouse click. The manipulator is not updated as you move the mouse over
43、 the surface, only when you click on the surface. Sometimes, the geodesic distance computation fails. In this case, an euclidean distance might be used and the created point might not be located at the location of the mouse click. This is the case with closed surfaces or surfaces with holes. We advi
44、se you to split these surfaces before creating the point. Circle/Sphere center 196Page SheetMetal Design Version 5 Release 16 G Select a circle, circular arc, or ellipse, or G Select a sphere or a portion of sphere. A point is displayed at the center of the selected element. Tangent on curve 197Page
45、 SheetMetal Design Version 5 Release 16 G Select a planar curve and a direction line. A point is displayed at each tangent. The Multi-Result Management dialog box is displayed because several points are generated. Refer to the Managing Multi-Result Operations chapter. Between G Select any two points
46、. G Enter the ratio, that is the percentage of the distance from the first selected point, at which the new point is to be. You can also click Middle Point button to create a point at the exact midpoint (ratio = 0.5). Be careful that the arrow is orientated towards the inside of the curve (providing
47、 the curve is not closed) when using the Middle Point option. G Use the Reverse direction button to measure the ratio from the second selected point. 198Page SheetMetal Design Version 5 Release 16 If the ratio value is greater than 1, the point is located on the virtual line beyond the selected poin
48、ts. 3. Click OK to create the point. The point (identified as Point.xxx) is added to the specification tree. G Parameters can be edited in the 3D geometry. For more information, refer to the Editing Parameters chapter. G You can isolate a point in order to cut the links it has with the geometry used
49、 to create it. To do so, use the Isolate contextual menu. For more information, refer to the Isolating Geometric Elements chapter. 199Page SheetMetal Design Version 5 Release 16 Creating Lines This task shows the various methods for creating lines: G point to point G point and direction G angle or normal to curve G tangent to curve G normal to surface G bisecting It also shows you how to create a line up to an element, define the len