Free Siemens NX (Unigraphics) Tutorial - Surface Modeling

Intellectual Technology Limited Siemens NX 6 Surface Modeling - Mouse

Provide Expertise to Siemens NX Users in China and Hong Kong

Siemens NX 6 Surface-modeling (Tutorial 2 – Mouse)

Surface-modeling Solid-modeling Assembly Design Design with a Master Model Design in Context Version 1a – Feb 2010

Copyright © 2010 by Intellectual Technology Limited

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Tutorial 2A - Import 2D outline drawing into Siemens NX 6 - Build 3D curves based on the imported drawing - Build the upper surfaces of the mouse Tutorial 2B - Do the draft analysis to search any undercut portion on the upper surfaces - Build the lower surfaces of the mouse - Convert the surfaces into a solid (Master Model) Tutorial 2C - Build the parting surfaces based on the imported drawing - Create components from the finished model - Create a new part in the assembly (Design in Context) - Modify a part design while looking at other parts (Design in Context)

Please be reminded that this series of tutorials is designed to demonstrate a design approach with Siemens NX, rather than the command itself. For the details of commands, please read the online help or attend the software training.

Version 1a – Feb 2010


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Let’s Start!

Tutorial 2A

•

Create a new project folder (e.g. C:\projects\mouse) and copy the drawing file (mouse_outline_b.dxf) into the folder

•

Enter Siemens NX 6 by double-clicking its icon on the desktop

•

Select “Roles Essential with full Menus”, then click ok

• • •

File/New Select Model as Type Enter “master_model_a.prt” as file name Select the path of the project folder Click ok

• •




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Tutorial 2A • • •

Double-click on the default Datum coordinates system Select “Absolute CSYS” as type Click ok

Double-click to edit

To Import the outline drawing:• File/Import/DXF • Select the file “mouse_outline_b.dxf” • Select “WORK” as “Import to Part” • Click ok (the imported curves will be pasted on the XY plane)



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Tutorial 2A To confirm that the size of the drawing is correct:• Double-click on the scale line of the drawing • Check if the displayed length is 50mm; if not, we need to enlarge or shrink the drawing into the correct size • Delete the scale line ( we don’t need it anymore)

To Reposition the 3 views (offset from absolute datum by 150mm):• Edit/Move Objects… • Select all the curves of Top View • Select “Move Handle Only” • Drag the handle to the midpoint of the arc • Deselect “move handle only” • Select “Move Original” • Enter x =0. y=0, z=150 • then rotate about z by 90deg (clockwise) • Click “Apply”



Handle (free to move)

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Tutorial 2A • • • • • • •

Select all curves of Front View Select “Move Handles Only” Draft the handle to the midpoint of the line Deselect “move handles only” Enter x =0, y= -150, z=0 Then rotate about x by 90deg (as shown ) Click apply

• • •

Select all curves of Right View Select “Move Handles Only” Draft the handle to the endpoint of the line

• • • • •

Deselect “move handles only” Enter x =150, y= 2.85, z=0 Then rotate about x by 90deg (as shown Rotate about z by 90deg (as shown ) Click ok to complete


Top View

Right View

Front View

)

Result


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Tutorial 2A To Change all curve colors to Yellow:• Select all curves • Right-click on a curve, select “edit display” • Select “Yellow” as Color • Click ok To Move all curves to a layer99:• Select all curves • Select “Format/ Move to Layer…” • Enter 99 • Click ok To make all layers Invisible, except layer 1, 61&99:• Format/Layer Settings… • UnTick all layers, except 1, 61, & 99 • Select “visible only” for layer99 • Click close Version 1a – Feb 2010


unTick Page 8



Tutorial 2A • • • •

Insert Datum/Datum plane Select xy plane Distance 50mm Click ok

• • • • • •

Insert/Sketch… Select the offset plane Click ok Draw a point as shown Mirror the point around y axis Draw a 3-point arc (start & end at the existing points, middle at the origin) Drag the endpoint to make it longer (the arc should match the reference) Click icon “Finish Sketch”

• • •



Mirrored point

Draw a point here

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Tutorial 2A • • • • •

Insert Datum/Datum plane Select xz plane Reverse Direction Distance 50mm Click ok

• • • • • •

Insert/Sketch… Select the offset plane Click ok Draw a point as shown Mirror the point around z axis Draw a 3-point arc (start & end at the existing points, middle on the yellow arc) Drag on the curve to adjust radius Drag an endpoint to make it longer Click icon “Finish Sketch”

• • •


drag drag


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Tutorial 2A To build a 3d curve by combined projection :• Insert/ Curve from Curves/ Combined Projection • Select sketch.0 as curve.1 • Select sketch.1 as curve.2 • (projection direction = normal to curve) • Click ok

• •

Sketch.0

Sketch.1

Hide Sketch.0 & Sketch.1 (right-click, select “hide”) Hide Plane1 & Plane2

(This combined curve can fit the shapes of both top view and front view) Version 1a – Feb 2010


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Tutorial 2A • • • • • •

• • • • • • • •

Insert/Datum/Datum plane Select yz plane Switch to Top View Drag the plane onto the plane (we can drag the green ball to make the plane bigger) (offset value = 30.5) Click ok

drag

Insert/Sketch Select the offset plane, click ok Draw two arcs (tangent to each other) Click icon “Constraints” Select the end point and the absolute y axis Select “point on curve” (the endpoint is now on y-axis) Adjust the shape & position of the arcs so that they can match the yellow reference Click icon “finish sketch”



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Tutorial 2A To Create an extruded surface:• Insert/Design Feature/Extrude… • Select the combined curve as Section • Select +Z as the direction • Enter 20 mm as distance • Click ok

To Create a Draft 5 deg (from parting line):• Insert/Detail Feature/Draft • Select “From Edges” as type • Select +Z as Draw Direction • Select the lower edge • Enter 5 deg as Angle 1 • Click ok Version 1a – Feb 2010


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Tutorial 2A To Create an extruded surface with Draft:• Insert/Design Feature/Extrude • Select “Sketch.2” as Section • Select +Z as the direction • Enter 20 mm as distance • Select “From Start Limit” as Draft • Enter 5 deg as Angle • Click ok To • • • •

Mirror a surface:Insert/Associative Copy/Mirror Body Select this surface as body Select yz plane as mirror plane Click ok result



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Tutorial 2A • • • • • • • •

Insert/Detailed Feature/Face Blend Select surface as Chain1 Select surface as Chain2 (Both arrows should point inward; if not, reverse it) Enter 5mm as Radius Select “Trim to all input faces” Click ok Repeat the above steps for the opposite side

result Version 1a – Feb 2010


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Tutorial 2A •

Hide Datum.3

• • •

Insert/Sketch Select XZ plane, click ok Insert/ Curve from Curves/Offset from curve Select the combined curve 3.5 mm as offset value Click ok (We can create an offset curve from any entity that is out of the sketch.) Click icon “Finish Sketch”

• • • • •



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Tutorial 2A To create a sketch mating with an external sketch:• Insert/Sketch • Select yz plane • Draw two arcs as shown (tangent to each other) • Draw a horizontal line starting from the connecting point , then make either one tangent to it; Convert the line to a reference line • • • •

Create an intersection point on the offset curve (Insert/Curve-from-curves/intersection point) Make a “Point on curve” constraint Adjust the shape & position of the arcs so that they can match the yellow reference (just drag on curves or points) Click icon “finish sketch”


Horizontal line(reference)

Offset curve


Coincided with y axis

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Insert/Datum/Datum plane Select XZ plane Select the endpoint Select “Associative” Click ok

• • • • •

Insert/Sketch Select the offset plane, click ok Draw a point as shown Mirror the point around Z axis Draw a 3-point arc (start & end at the two points, middle at the point ) Drag on the curve to adjust radius Drag the endpoint to make it longer Click icon “Finish Sketch”

• • •



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Tutorial 2A To Create a Swept surface ( 1section & 2 guides):• Insert/Sweep/Swept • Select “Single Curve” on selection filter • Select Curve as Section • Select Curve as Guide 1 • Click “Add new set” • Select Curve as Guide 2 • Click ok • • • • • •

Insert/Trim/Trim-and-Extend Select “Make Corner” as type Select a surface as Target Select the other surface as Tool Reverse arrows so that the result is as shown Click ok



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• •

Insert/Trim/Trim body Select the surface as Target Select Plane as Tool (arrow should point backward; if not, reverse it) Click ok

Insert/Detail-Feature/Edge Blend Select an edge (all tangent edges are selected automatically; selection filter = tangent curves) 7mm

• • •

Specify four points as variable radius points Enter values as shown Click ok

3mm 7mm 3mm



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Tutorial 2A • Draw one horizontal line at point (Insert/Curve/Line , select “associative”) • Draw one vertical line at point • • • • • •

Insert/ Curve-from-Curves/Bridge Select horizontal line as start object Select vertical line as end object Select G1 (tangent) as start Select G1 (tangent) as end Select “Associative”

• •

Orient View to Top View Drag the arrows to match the yellow reference Click ok

•



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Tutorial 2A • • • •

Insert/Curve-from-Curves/Mirror Select the bridge curve as Curve Select YZ plane as Mirror Plane Click ok

• • • •

Insert/Curve-from-Curves/Mirror Select Sketch.3 as curve Select YZ plane as mirror plane Click ok

•

Hide Sketch.6

• • • • •

Insert/Mesh Surface/Through-Curve-Mesh Select Primary Curve 1 &2 Select Cross Curve 1 , 2 & 3 (Refer to next page) Select “G1 tangent” as first primary continuity, select the surface Click ok

•



Sketch.6

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Tutorial 2A

2 Primary Curves

Primary curve1

Selection filter = Tangent curves Select an edge of Primary curve1 Add New Set

Primary curve 2

Selection filter = Single Curves Select the two arcs of Primary curve 2 (Arrow direction same as Curve1) Add New set

3 Cross Curves

File/Save Version 1a – Feb 2010


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Tutorial 2A To Check if the whole skin can meet the required shape… • • • • • •

Orient view to Top View Check Orient view to Front View Check Orient view to Right View Check

Take a Rest!

• File/ Save



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Tutorial 2B • • • • •

Insert/Sketch Select Plane.1 , click ok Draw a vertical line, then mirror it Draw two arcs (tangent to lines) Click icon “finish sketch”

• • • • •

Insert/Trim/Trimmed-Sheet Select the surface as Target Select the last sketch as Boundary Object “Normal to Curve Plane” Click ok



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Tutorial 2B • • • • • • • •

Insert/Mesh Surface/Sections… Select “Two Point Radius” as Type Select Start guide Select End guide Select Spine curve Law type = Constant Value = 5mm Click ok

• • • • • • • •

Insert/Mesh surface/Through Curves Select section1 Select section2 Select G2 curvature as First section continuity Select the last surface Select G0 curvature as last section continuity Flow direction = Perpendicular Click ok

•

Repeat the above steps to close another opening



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Tutorial 2B • • • •

Insert/ Combine Bodies/ Sew Select the biggest surface as Target Select other surfaces as Tool Click ok

• • •

Analysis/Shape/Draft Change draft angle to 3 deg An error is found (not enough 3 deg)

• • •

Double-click the line Add 10 deg The bridge curve will be updated (if it is associative)

•

(If you forgot to make the bridge curve “associative”, double-click to edit, drag the end point out and snap onto the endpoint of the line again, select G2.)

•

Do Draft analysis again to see if the error is corrected.



undercut

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Tutorial 2B We are going to build a lower skin… • • • •

Insert/Design Feature/Extrude Select the curve Enter -20mm as End Limit distance Click ok

• • • • • •

Insert/Design Feature/Draft Select “From edges” as type Select +z as Draw Direction Select the top edge Orient View to Right View Drag the draft angle to 10 deg (to match the Yellow reference) Click ok

•


drag


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Tutorial 2B • • • • • • •

Insert/Flange Surface/Law Extension Select the sketch as base profile Select –Z as reference vector Length law = constant, 30mm Select “Linear” as Angle Law type Start = 10 deg, End = 2 deg Click ok

• • • •

Insert/Associative Copy/Mirror Body Select the surface Select yz plane as mirror plane Click ok



end

start

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Tutorial 2B • • • • • • •

•

Insert/Detail Feature/Face Blend Select surface as Chain1 Select surface as Chain2 (Both arrows should point inward; if not, reverse it) Enter 4.5mm as Radius Select “Trim to all input faces” Click ok

Repeat the above steps for the opposite side



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Tutorial 2B • • • • • •

Insert/Curve/Line Select the origin as start point Select any point on x-axis Enter -50mm as start limit Enter 50 mm as end limit Click ok

• • • •

Insert/Design Feature/Extrude Select the line as section Select y as direction Drag the handle to define the length, longer than the model Click ok

• • • •

Insert/Combine Bodies/Sew Select all surfaces, except the last extruded surface Click ok



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Tutorial 2B • • • • • •

Insert/Trim/Trim-and-Extend Select “Make Corner” as type Select Target surface Select Tool surface Reverse arrows so that the result is as shown Click ok

To check if the solid can be created:• Right-click “Name”, deselect “Timestamp order” • One Sheet Body is found, but not a solid!



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Tutorial 2B To find out the surface gaps that lead to the failure of surface-to-solid conversion:• Insert/Offset-Scale/Sheets-to-Solid-assistant • Enter 0mm as First Offset & Second Offset • Select the surface • Click Apply • Select “Show Sheet Boundary” (two gaps are found) • Click Cancel •

Right-click “Name”, select “Timestamp order”

•

Double-click to edit the last SEW feature on tree Increase Tolerance from 0.025 to 0.05 Click ok (Now a solid can be created)

• •



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Tutorial 2B • • • •

Insert/ Design Feature/Edge Blend Select the edge Enter 1mm as radius Click ok

• • • • • •

Insert/Offset-Scale/Shell Select “Shell all Faces” as type Select the solid (arrow should point inward) Enter 2.5mm as thickness Click ok

•

Show all sketches/curves/ datums

• •

Move all sketches/curves to Layer 41 Move all offset datum planes to Layer 61

•

File/Save

Take a Break! Version 1a – Feb 2010


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Page 36



Tutorial 2C We’ve built the overall shape of the mouse. Now, we are going to create parting surfaces, and then split the master model into separate components. Check Top View Check Front View Check Right View (the model should match the three reference views)



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Tutorial 2C •

Make Layer 41 visible

• • • • •

Insert/Sweep/ Swept Select Section curve Select Guide curve Select “Anywhere along guide” as section location Click ok

• • • • •

Insert/Design Feature/Extrude Select the two surface edges Select +z value as direction Enter 3 mm as start limit, -10mm as end limit Click ok

• • • •

Insert/Offset Scale/Offset Face Select the extrude surface Enter 2.5mm as offset (arrow pointing inward) Click ok


guide section


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Tutorial 2C • • • • •

Insert/Trim/Trim-and-Extend Select “By Distance” as type Select the surface edges Enter 10mm as extension Click ok

Hide the solid body •

Draw a line (from point to point); select associative

• • •

Insert/Mesh Surface/N-sided Surface Select the line & the edges Click ok



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Tutorial 2C • • • •

Insert/Trim/Trim-and-Extend Select the surface edge Enter 20mm as extension Click ok

• • •

Insert/Combine Bodies/Sew Select the two surfaces Click ok

• • • • •

Insert/Trim/Trim-and-Extend Select “Make Corner” as type Select Target surface Select Tool surface Reverse arrows so that the result is as shown Click ok

•

result Version 1a – Feb 2010


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Tutorial 2C • • • • •

Insert/Sketch Select Datum plane1 on tree, click ok Draw a symmetrical arc as shown Click icon “finish sketch”

• • • •

Insert/Design Feature/Extrude Select the sketch Reverse Direction Enter 80mm as distance , click ok.

• •

Create a sketch on Datum plane 1 Create an extrude surface (80mm downward)



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Tutorial 2C •

Show the Solid

• • •

Format/Layer settings Make layer 41 (curves) invisible Make layer 61 (datums) invisible

• • • •

Select all remaining curves/sketches Format/Move to Layer Move them to layer 42 File Save

• •

File/New/Assembly Enter “Mouse_assembly_a.prt” as file name; in the same project folder Click ok Select “master_model_a.prt” on the list Select “Absolute Origin” as Positioning

• • •



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Tutorial 2C We are going to split the Master Model into separate parts (part files)… The outlook of the mouse is controlled by the Master Model. If we make any change on it, the linked parts will be updated automatically. Also, because all components are created from one model, their surfaces & boundaries can always match among themselves when assembled together.


With Link


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Tutorial 2C To Create Upper Body:• Assemblies/Components/Create New Component • Select “model” as type • Enter “upper_body_a.prt” as filename • Click ok, click ok •

Double-click Upper_body on tree (Jump into part level from assembly level)

• • • •

Insert/Associative Copy/WAVE geometry linker Select the solid & three surfaces Click ok Hide master model (untick it on tree)

•

Insert/Trim/Trim Body (3 times) to get this shape

• •

Move all surfaces to Layer 11 Hide all layers except layer 1



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Tutorial 2C To Create Right Button:•

• • • • •

Double-click mouse_assembly into assembly level from part level) Hide (unTick on tree) Upper Body Show (Tick on tree) mastermodel

(Jump

•

Create a new component (refer to previous steps) Enter ”right_button_a.prt” as filename Copy the solid & parting surfaces from master model Hide mastermodel

• • •

Create an Offset Surface (one face only) (0.5mm) Offset face (1mm, forward) Offset face (1mm, upward)

• •

Do 3 Trims Move all surfaces to Layer 11



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Tutorial 2C To Create Left Button:• • •

Double-click mouse_assembly Hide other component Show mastermodel

• • • •

Create a new component Enter “left_button_a.prt” as filename Copy the solid & parting surfaces from master model Hide mastermodel

• • •

Offset Surface (one face only) (0.5mm) Offset face (1mm) Offset face (1mm)

• •

Do 3 Trims Move all surfaces to Layer 11



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Tutorial 2C To Create Middle Button:• • •


• •

•

Create a new component Enter “middle_button_a.prt” as filename Copy the solid & parting surfaces from master model Hide mastermodel

• •

Do 2 trims Move all surfaces to Layer 11

•



Page 47



Tutorial 2C To Create Lower Body:• • •


• • • •

Create a new component Save it as “middle_button_a.prt” Copy the solid & parting surfaces from master model Hide mastermodel

• •

Offset face (0.5mm, downward) Trim body

•

Move all surfaces to Layer 11



Page 48



Tutorial 2C To Create a Wheel (New Part):• •

Double-click mouse_assembly Show all components, except mastermodel

• •

Create a new component Enter “wheel_a.prt” as filename

• • • • •

Double-click wheel_a Insert/Sketch Select yz plane (zoom in to view), click ok Draw a circle at origin (dia 20mm ) Click “finish sketch”

• • • •

Insert/Design feature/Extrude Select the sketch Enter 3mm as start, -3mm as end Click ok

• •

Add Edge Blends 2mm Move sketch to layer 21



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Tutorial 2C •

Double-click mouse_assembly

•

Assemblies/Components/Move component Select Wheel model Click “specify orientation” on the command menu Drag the wheel to the correct position

• • • •

Switch to top view, the wheel is nearly in the middle of the slot

•

Switch to right view, the wheel position is roughly as shown



Page 50


“Design in Context” – make a design change while looking at other parts


Tutorial 2C

•

Double-click middle_button_a

• • • •

Insert/Sketch Select xy plane Draw a profile slightly bigger than the wheel Click icon “finish sketch”

• • • • • •

Insert/Design Feature/Extrude Select the sketch Select “symmetric value” as limits Enter 100mm Select “Subtract”, select the solid Click ok

•

Double-click “mouse_assembly” on tree

• File/Save all Version 1a – Feb 2010


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Tutorial 2C • •

• • • • •

Click tab page “System materials” on the left Apply material texture one by one (just drag and drop) Upperbody, leftbutton & rightbutton (aluminium) Middle button & wheel (plastic black) Lowerbody (plastic shiny resin red)

Drag & drop

Double-click any material on list, then we can see “Materials in part” Edit “Plastic Black”, change roughness to 0.05

•

View/Perspective

• • • •

View/Visualization/High-Quality-Image Click icon “basic scene editor” Deselect “Use Image based lighting” Start Shade, then save it as tif



Finished! Well Done! Page 52

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Free Siemens NX (Unigraphics) Tutorial - Surface Modeling

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