Unigraphics NX8 - Sweep

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Sweep View a topic Swept

Sweep along Guide

Variational Sweep

Tube

1. Swept Use the Swept command to create a solid body or a sheet by sweeping one or more sections along one, two, or three guide strings. You can:    

Control the shape of the swept body by aligning section strings along the guide strings. Control the orientation of sections as they sweep along the guide strings. Scale the swept body. Use a spine string to make the isoparametric curves on the surface uniform.

Where do I find it? Application

Modeling

Toolbar

Surface→Swept

Menu

Insert→Sweep→Swept

1.1.

Create a Swept feature using two guides

This example shows how to create a swept surface using two curves to guide the section.

Sweep

drive24ward (meslab.org/mes)

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1. On the Surface toolbar, click Swept

2

or choose Insert→Sweep→Swept.

The Swept dialog box opens. 2. In the graphics window, select the curve shown to use as the section string.

3. Click the middle mouse button. The section string selection is saved and displayed in the List box in the Sections group. Note You can select more section strings to define the swept section at this time. The strings are displayed in the List box in the Sections group. 4. Click the middle mouse button to complete the selection of the sections. The Guides group selections are now active. 5. In the graphics window, select the first guide string.

6. Click the middle mouse button to accept the first guide string. 7. Click the second guide string.

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8. Click the middle mouse button to complete the selection of guides. 9. Click the middle mouse button or OK to create the Swept surface.

1.2.

Create a Swept feature using three guides

You can use three guides to sweep a section.

Section to sweep

First guide Second guide Third guide

Swept surface

1.3.

Swept dialog box

Sections Select Curve Lets you select up to 150 section strings.

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Specify Origin Curve Lets you change the origin curve in a closed loop.

Add New Set

Adds your current selection to the List box in the Sections group and creates a new, empty section. You can also add a new set by pressing the middle mouse button when you select the section.

List Lists existing sets of section strings. The sequence of selecting the string sets determines the resulting sweep.

Section 1 Section 2 Section 3 Guide

Remove Removes the selected string from the list. Move Up Reorders the sequence of string sets by moving the selected string up in the list. Move Down Reorders the sequence of string sets by moving the selected string down in the list.

Guides (3 Maximum) Select Curve

Lets you select up to three strings to guide the sweep operation. For more information, see Guides for Swept feature.

Specify Origin Curve Lets you change the origin curve in a closed loop.

List

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Lists existing guide strings. The sequence of selection of string sets does not affect the resulting sweep. Spine Lets you select a spine curve. Use a spine curve to control the orientation of the section strings and to avoid distortions caused by the uneven distribution of the parameters on the guides. A spine string works best when it is normal to the section strings.  

Select Curve

Constructs section planes that are perpendicular to the spine and intersect the guide strings. Aligns the isoparametric curves on which the sweep is based, to these planes. For more information, see **Unsatisfied xref title**.

No spine used

Spine used

Non-uniform isoparametric curves.Uniform isoparametric curves. Section Options Available when you select a single section. When a section is in the middle of a guide, these options change the resulting sweep.  

Anywhere along Guides sweeps on both sides of the section along the guide. Ends of Guides sweeps along the guide in only one direction, starting from the section.

Section Location

Anywhere along Guides

Ends of Guides

Available when you select more than one section. Interpolation

Sweep

Determines the shape of the surface transition between sections.


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

Linear makes the surface transition from one section to the next following a linear distribution. NX creates a separate face between each pair of section strings.



Cubic makes the surface transition from one section to the next following a cubic distribution. NX creates a single face across all section strings.



Blend makes the surface transition from one section to the next so that the consecutive segments are G1 continuous. NX creates a single face across all section strings.

Alignment Method Defines the alignment of isoparametric curves between the defining curves. 



Alignment 

Parameter spaces the points through which the isoparametric curves pass at equal parameter intervals along the defining curves. NX uses the entire length of each curve. Arc Length spaces the points through which the isoparametric curves will pass at equal arclength intervals along the defining curves. NX uses the entire length of each curve. By Points aligns points between section strings that have different shapes. If the section strings contain any sharp corners, it is recommended that you use By Points to preserve them. Note By Points is available when you use more than one section strings to

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7 define the swept surface. Specify Point

option is available.



Orientation Method Available when you use a single guide string. Controls the orientation of the section as it moves along the guide.  

Fixed maintains a fixed orientation of the section string as it moves along the guide, and the result is a simple parallel or translational sweep. Face Normals aligns the second axis of the local coordinate system with the normal vector of one or more faces that specify a common base at every point along the guide. This constrains the section string to maintain a consistent relationship to the base faces or faces. Select Face




Vector Direction aligns the second axis of the local coordinate system with a vector you specify over the length of the guide string. Note The Vector Direction method is non-associative. If you select a vector for the orientation direction, and then later change that vector's direction, the Swept feature is not updated to the new direction.

Orientation  

Specify Vector options are available. Another Curve uses the second axis of the local coordinate system obtained by joining corresponding points on the guide and the other curve (as though a ruled sheet had been constructed between them) to orient the section. Select Curve



A Point is similar to Another Curve, except the second axis is obtained with the equivalent of a three-sided ruled sheet between the guide string and the point. Specify Point




options are available.

Angular Law lets you use Law Subfunction to define a law that controls the orientation. For more information, see Law Types. Note Orientation control for the rotate angle law has a maximum of 100 revolutions, and 36000 degrees.



Sweep

Angular Law is available only for sweeps with one section string. drive24ward (meslab.org/mes)

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8 Law Type options are available. Forced Direction lets you fix the orientation of the section plane with a vector as the section string is swept along the guide string. Specify Vector

Fixed Orientation

options are available.

Orientation set to Vector Direction ZC

Scaling Method Increases or decreases the size of the section as it is swept along the guide. The following options are available when you use one guide.   





Scaling



Constant specifies a scale factor that remains constant along the entire guide. Blending Function allows linear or cubic scaling between specified starting and ending scale factors, which correspond to the start and end of the guide string. Another Curve similar to the Another Curve method in the Orientation Method group. This Scaling method bases the scale at any given point on the length of the ruling between the guide string and the other curve or solid edge. A Point is the same as Another Curve, except it uses a point instead of a curve. Choose this method when you also use the same point for orientation control to construct a three sided sweep. Area Law lets you use the Law Subfunction to control the cross-sectional area of the swept body. Perimeter Law is similar to Area Law, except that it lets you control the cross sectional perimeter of the swept body instead of its area.

Following options are available when you use two guides. 

Sweep

Uniform scales the section string both laterally and vertically.


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

Lateral scales the section string in the lateral direction only.



Another Curve uses a curve as a scaling reference for controlling the height of a swept surface.

This scaling method does not control surface orientation. Use this method to avoid surface distortion problems that can occur when you use three guides to create the swept surface. 3 Guides

1. Section rectangle 2. Guides (3)

Another Curve

1. Section 2. Guides (2) 3. Another Curve

Available when Scaling is set to Constant. Scale Factor

Lets you specify a value to scale the section string before sweeping it. The section string is scaled about the point at the start of the guide. Available when Scaling is set to Blending Function.

Blending Function

Lets you set the blending between sections to Linear or Cubic. Specify values for Start and End for the Blending Function.

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Settings Lets you specify either a sheet body or a solid body for the swept feature. Body Type

 

Solid Sheet

To get a solid body, the section strings must form closed loops. Available only when Alignment is set to Parameter or By Points. Preserve Shape

Preserves sharp corners by forcing a tolerance value of 0.0. When you clear this option, NX approximates all the curves in a section to a single spline and sweeps the approximation. All Rebuild options are available for both section strings as well as guide strings. Click the Guides or Sections tab in the Settings group to select Rebuild options for Guides or Strings respectively. Note The Sections tab is not available in the following cases:  

Rebuild

When the Preserve Shape checkbox is selected in the Settings group. When Alignment is set to Arc Length in the Alignment Method group.

Constructs a high-quality surface by redefining the degree and/or segments of the section or guide curves. The strings may represent a desired shape, but if they have poor knot placement or there are differences in degree between them, the output surface may be more complex than necessary, or the isoparameteric lines may be too wavy. This may produce incorrect highlighting and prevent continuity between surfaces.  

None turns Rebuild off. Degree and Tolerance rebuilds the surface using a specified Degree. Segments are inserted to achieve the specified tolerances. The degree you specify is effective in the U and V directions. Higher degree curves reduce the chance of unwanted inflections and sharp changes in curvature. NX inserts knots as required to achieve the G0, G1 and G2 tolerance settings.



Auto Fit creates the smoothest possible surface within the required tolerances. Specify Maximum Degree and Maximum Segments. NX tries to rebuild the surface without adding segments up to the maximum degrees. If the surface is out of tolerance, NX adds segments up to the maximum number you specify. If the surface is still out of tolerance, NX creates it and displays an error message.

Tolerance Specifies the maximum distance between the input geometry and the resulting body. (G0) Position

Specifies the value of Distance Tolerance. For more information, see Modeling Preferences — General.

(G1) Tangent Specifies the value of Angle Tolerance. For more information, see Modeling Preferences

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— General.

1.4.

Guides for Swept feature

Guide strings control the orientation and scaling of the body in the sweeping direction. A guide string can consist of one or more objects, and each object can be a curve, a solid edge, or a solid face. All the objects in each guide string must be smooth and contiguous. If all the guide strings form closed loops, you can reselect the first section string as the last section string. You can select one, two, or three guides. One guide Use one guide for simple translational sweeps. You can control the orientation and scale of the section string along the sweep using the orientation and scaling options.

Section swept with one guide and scaled using constant area law Two guides Use two guides when you want to orient a section along the sweep. When you use two guides, the section string is oriented along the second guide. You can scale the section using scaling options. Scaling can be lateral or uniform.

Section swept with one Section swept with two guides and Section swept with two guides and guide scaled laterally scaled uniformly Three guides

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Use three guides when you want to shear the body on an independent axis. When you use three guides, the first and second guide define the orientation and scaling of the body. The third guide shears the body.

Section swept with one guide Section swept with two guides Section swept with three guides

2. Variational Sweep Use the Variational Sweep command to create a body by sweeping a cross section along a path where the shape of the section varies along the path. You can do the following:   

Sweep faces that are coincident, tangent, or normal to other curves and faces. Add secondary sections to vary dimensions at specific locations. Extend the body beyond the length of the path or limit it.


Modeling

Toolbar

Surface→Variational Sweep

Sweep


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Insert→Sweep→Variational Sweep

2.1.

Sweep a section along a path

This example shows how to sweep a section along a path to create a tongue that is oriented relative to the edges of a solid body.

1. On the Surface toolbar, click Variational Sweep Sweep.

or choose Insert→Sweep→Variational

2. In the Variational Sweep dialog box, in the Section group, click Sketch Section

.

The Create Sketch dialog box opens. 3. Select the curves or edges to define the path. In this example, an edge is selected with the Tangent Curves curve rule in the Selection bar.

4. In the Plane Location group, in the % Arc Length box, type a value. In this example, the sketch plane is at the start of the selected path where % Arc Length is 0.

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5. Click OK to accept the sketch plane. 6. Use sketch tools to create and constrain a section. In this example, the section is a rectangle that is positioned relative to the point on the path.

7. Click Finish Sketch . 8. In the Variational Sweep dialog box, from the Boolean list, select Unite. 9. Click OK to create the feature.

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2.2.

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Sweep a section along two paths

This example shows how to use the Variational Sweep command to sketch a section and sweep it along two paths.

1. On the Surface toolbar, click Variational Sweep Sweep.

or choose Insert→Sweep→Variational

2. In the Variational Sweep dialog box, in the Section group, click Sketch Section

.

The Create Sketch dialog box is displayed. 3. Select the curves or edges to define the first path. 4. In the Plane Location group, in the % Arc Length box, type a value. In this example, % Arc Length is 0 so the sketch plane is at the start of the selected path.

5. In the Create Sketch dialog box, click OK to accept the sketch plane. A point is created automatically at the intersection of the path and the sketch plane. 6. In the sketch, use the Intersection Point command to create another point at the intersection of the second path and the sketch plane.

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7. Use sketch tools to create and constrain the section. Constrain the ends of curves so that they are coincident with the point on the first path and the intersection point on the second path.

For more information, see Sketch on Path, and Intersection Point. 8. Click Finish Sketch . 9. In the Variational Sweep dialog box, click OK.

2.3.

Add a secondary section to a feature

You can add secondary sections to a variational sweep feature to control dimensions at specific locations. This example shows how to edit an existing variational sweep feature and add a secondary section to control a dimension.

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1. In the graphics window, right-click the variational sweep feature and choose Edit with Rollback. 2. In the Variational Sweep dialog box, in the Secondary Sections group, click Add New Set The List box has a start section, an end section, and the new secondary section. 3. From the Position Method list, select Through Point. 4. In the graphics window, select a point to define the new section location. In this example, an end point is selected.

5. In the graphics window, select the dimension on the secondary section to change. In this example, the dimension is changed to 80.

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6. In the Secondary Sections group, from the List, select End Section. 7. In the graphics window, select the dimension in the end section to change. In this example, the dimension is changed to 80.

8. Click OK to complete the edit.

2.4.

Edit the limits of a variational sweep

This example shows how to edit the limits of a variational sweep feature so that it can be trimmed to a datum plane. The existing feature was created by sweeping a section that is oriented normal to a path but it does not intersect the intended trim plane.

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1. In the graphics window, right-click the variational sweep feature and choose Edit with Rollback.

2. In the Variational Sweep dialog box, in the Limits group, specify the start and end limits. In this example, the End is set to % Arc Length and the value is changed to 110. 3. Click OK to complete the edit. The feature extends beyond the datum plane.

4. Use the Trim Body command to trim the sheet body to the datum plane.

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2.5.

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Variational Sweep dialog box

Section Lets you create an internal sketch on a curve as the primary section for the variational sweep. The point you select on the path for the sketch defines the origin of the sketch, and the path acts as a guide. You can add optional curves or edges to serve as guides for the master section as it sweeps along the path using the Intersection Point command in the Sketch task environment. Select Curve

For more information on sketch functions, see Sketch in Place and Sketch on Path. When you exit the Sketch task environment, your sketch is automatically selected as the section to sweep, and the curve is the guide. You can deselect any of the curves in the sketch to form the section. For more information on internal sketches, see Internal and External Sketches.

Limits Let you specify the start and end points of the sweep. The guide can be closed or open. For an open loop, if you specify limits beyond the end of an open path in either direction, NX extends the path to create the sweep. Start/End

  

% Arc Length starts the sweep at the specified percentage along the length of the guide curve. Arc Length starts or ends the sweep at the specified length along the guide curve. Through Point starts or ends the sweep at the specified point on the guide curve. Specify Point

options are available when you select Through Point.

Secondary Sections Secondary sections are copies of the primary section. You can change the dimensions, but not the shape, of secondary sections. If you reattach a multi-section sweep to a different path, NX maps the primary and secondary sections to the new path automatically. Creates secondary sections that you can use to adjust the sweep dimensions.

Add New Set

NX automatically creates new expressions for secondary section dimensions and sets each dimension equal to the corresponding variable in the primary section. To display secondary section dimensions, click the section in the List box. You can edit dimensions in these ways: 

Sweep

In the graphics window while you are working with the Variational Sweep feature. drive24ward (meslab.org/mes)

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21 In the Expressions dialog box. In the Part Navigator Details pane.

Lets you specify the position of the selected secondary section. Position Method

Use % Arc Length, Arc Length, and Specify Points options to position secondary sections along the path.

Boolean Lets you choose the Boolean options to control how the new sweep interacts with other bodies that it comes in contact with, after it is created. Boolean

You can also move the cursor over the variational sweep preview in the graphics window, and right-click to choose a Boolean option. For more information, see Boolean operations and Sew.

Settings Minimizes the number of faces where possible, by merging faces along the path direction. When this box is cleared, the resulting sweep has multiple faces, each corresponding to a segment of the guide curve.

Merge Faces if Possible

Merge Faces off

Merge Faces on

Displays dimensions of the primary section in the graphics window. Show Sketch Dimensions

Note To display the dimensions of a secondary section, select the secondary section in the List box in the Secondary Sections group. Lets you specify the variational sweep as a solid body or a sheet body.

Body Type

You can specify a sheet body only when the section or the guide curve is a closed loop. The default is set in the Modeling Preferences dialog box. For more information, see Modeling Preferences — General. Lets you specify a maximum distance between the input geometry and the resulting body.

Distance Tolerance

Sweep

The default value is set in the Modeling Preferences dialog box. For more information, see Modeling Preferences — General for more information. drive24ward (meslab.org/mes)

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2.6.

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Lets you specify the tolerance used to ensure that the created surfaces are within the specified angle in relation to neighboring surfaces. The default value is set in the Modeling Preferences dialog box. For more information, see Modeling Preferences — General for more information.

Use constraints to control a Variational Sweep

The section of a variational sweep can change based on the path and the sketch constraints. If the sketch is constrained so that a curve is coincident to an intersection point, the boundary of the sweep will be coincident with the corresponding guide. You can control the variational sweep by adding or removing constraints from the primary section. Note Although a simple variational sweep may not need any constraints, it is recommended that the sketch be fully constrained. In this example, an intersection point is created from a second guide. The sketch is constrained so the ends of the lines are coincident with the point on the first guide at the sketch origin and the intersection point on the second guide. The lines are also constrained to be collinear with the tangent vectors.

The dimensions you add to constrain the sketch also affect the resulting sweep. In the example below, dimensions are added to different lines to maintain their length in the sweep.

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3. Sweep along Guide Use the Sweep along Guide command to create a body by sweeping one section along one guide. You can:   

Select a section and a guide consisting of connected sketches, curves, or edges. Select a guide that contains sharp corners. Create a solid body or a sheet body.

If you want to select multiple sections, multiple guides, or control the interpolation, scale, and orientation of the sweep, use the Swept command. Where do I find it? Application

Modeling

Toolbar

Surface→Sweep Drop-down→Sweep along Guide

Menu

Insert→Sweep→Sweep along Guide

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3.1.

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Create a Sweep feature

1. Choose Insert→Sweep→Sweep Along Guide. 2. In the Sweep along Guide dialog box, in the Section group click Select Curve, and then select the section curves in the graphics window.

3. In the Guide group click Select Curve, and then select the guide curves in the graphics window.

4. In the Offsets group, in the First Offset box, specify a value. For this example, a Offset of 4 is used.

5. Click OK.

3.2.

Sweep Along Guide dialog box

Section Lets you select a curve, an edge or a chain of curves or edges for the section.

Select curve

Sweep

Note If the section curves are far from the guide curves, you may not get results that you want. drive24ward (meslab.org/mes)

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Guide Lets you select a curve, an edge or a chain of curves or edges for the guide. All the curves in a guide string must be contiguous. Note the following:  

Select Curve

   

Lines in the guide path are extruded. The sweep direction is the line direction and the sweep distance is the line length. Arcs in the guide path are revolved. The axis of revolution is the arc axis located at the arc center and normal to the arc plane. The angle of rotation is the difference between the start and end angles of the arc. For 2D and smooth guide strings constructed by lines and arcs, lateral faces are planar or cylindrical faces. Exact geometry is created for non-smooth conics, splines, and B-splines. If you sweep along a guide string which has closed, sharp corners, it is recommended that you place the section string away from a sharp corner. You cannot create a Sweep feature if two adjacent lines in the guide path meet in an acute angle, or if an arc in the guide path has a radius too small for the size of the section curve. The path must be smooth with a continuous tangent.

Offsets First Offset

Offsets the Sweep feature to add thickness.

Second Offset

Offsets the base of the Sweep feature away from the section string.

No offsets specified Only first offset specified First and second offsets specified Boolean Boolean

Specifies the Boolean operation to use to combine the Sweep feature with a target solid.

Settings Specifies whether the Sweep feature is a solid body or a sheet body when the section is closed. Body Type

The default depends on the option selected in the Modeling Preferences dialog box, General tab→Body Type. For more information, see Modeling Preferences — General.

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Specifies the maximum gap between the curves. Specifies the maximum distance between the input geometry and the resulting body. The default depends on the value set in the Modeling Preferences dialog box on theGeneral tab→Distance Tolerance option.

Distance Tolerance

For more information, see Modeling Preferences — General.

4. Tube Use the Tube command to create a single solid body by sweeping a circular cross section along a centerline path with options for outer and inner diameter. You can create wire bundles, harnesses, tubing, cabling, or piping components with this command.


Modeling

Toolbar

Surface→Sweep Drop-down→Tube

Menu

Insert→Sweep→Tube

4.1.

Create a tube

1. Choose Insert→Sweep→Tube. In the Tube dialog box, in the Path group, Select Curve

is active.

2. Select the tube centerline path. For this example, the edges of an existing solid body are selected as the path.

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3. In the Cross Section group, specify a diameter in Outer Diameter. For this example, 7 is used. 4. In the Boolean group, select the type from the Boolean list. For this example, Unite is selected. 5. Click OK or Apply to create the tube.

4.2.

Tube dialog box

Path Specifies a centerline path for the tube. You can select multiple curves or edges. Select Curve

The path must be smooth and tangent continuous. The path cannot include gaps or sharp corners. If the path is a spline, it is approximated using the specified value in Tolerance.

Cross Section Outer Diameter

Sweep

Specifies the value for the outer diameter of the tube. Note



The outer diameter cannot be zero. drive24ward (meslab.org/mes)

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28 

Inner Diameter

This value cannot be more than the value specified in Inner Diameter.

Specifies the value for the inner diameter of the tube. To create a solid cable, use a value of zero.

Boolean Specifies the Boolean operation to use to combine the feature with a target solid. Boolean For more information, see Boolean operations. Settings If the path includes a spline or conic, specifies whether that portion of the tube is created as a single segment or multiple segments. Multiple Segments

Approximates the tube surface with a series of cylindrical and toroidal faces. These are determined by approximating the path with straight lines and arcs using the value specified in Tolerance. The tube is created as a cylinder for a straight line segment of the path, or a toroid for the circular segment of the path. Note Multiple segments apply only when the path includes a spline or conic.

Output

Single Segments

Creates one face for the portion of the path containing a spline or conic. The surfaces are B-surfaces. Two faces are created if there is an inner diameter.

Multiple Segments

Single Segments

Specifies a distance tolerance. This is the maximum distance between the input geometry and the centerline of the resulting body. Tolerance The default value is taken from the Modeling Preferences. For more information, see Modeling Preferences — General for more information.

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29 Mục lục

Sweep ........................................................................................................................................................................... 1 1.

2.

3.

4.

Swept ................................................................................................................................................................ 1 1.1.

Create a Swept feature using two guides ................................................................................................ 1

1.2.

Create a Swept feature using three guides .............................................................................................. 3

1.3.

Swept dialog box ...................................................................................................................................... 3

1.4.

Guides for Swept feature ....................................................................................................................... 11

Variational Sweep .......................................................................................................................................... 12 2.1.

Sweep a section along a path ................................................................................................................ 13

2.2.

Sweep a section along two paths ........................................................................................................... 15

2.3.

Add a secondary section to a feature..................................................................................................... 16

2.4.

Edit the limits of a variational sweep ..................................................................................................... 18

2.5.

Variational Sweep dialog box ................................................................................................................. 20

2.6.

Use constraints to control a Variational Sweep ..................................................................................... 22

Sweep along Guide ......................................................................................................................................... 23 3.1.

Create a Sweep feature .......................................................................................................................... 24

3.2.

Sweep Along Guide dialog box ............................................................................................................... 24

Tube ................................................................................................................................................................ 26 4.1.

Create a tube .......................................................................................................................................... 26

4.2.

Tube dialog box ...................................................................................................................................... 27

Sweep


Unigraphics NX8 - Sweep

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