6 - surface modeling nx sw

Ken Youssefi ME Dept. 1

Surface Modeling in SW

Open sketch

(spline)

Starting with a sketch, you can

create a surface using Extrude,

Revolve, Loft, Boundary Surface,

planar, and Fill.



Extrusion direction

Profile

Extruded surface

(Tabulated surface)

Revolved surface (surface

of revolution)

Axis of rotation



Swept surface using

a Guide Guide

Spline

Spline


Surface Modeling in SW - Ruled Surfaces

Guide 1

Guide 2 Loft surface, no

guide curve

Loft surface using two

guide curves.


Surface Modeling in SW- Boundary Surface

Sketch1,

Direction 2

Sketch2,

Direction 2

Sketch5,

Direction 1

Open loop

3D sketch,

Direction 1

Four curves defining the boundary of the surface, Coons surface

Make sure all curves are intersecting, then

select curves for directions 1 and 2



Boundary surface

The order of direction has no

effect on the surface shape

Direction 2

Direction 2

Direction 2

Direction 2



Direction 1 Direction 1


Surface Modeling in SW- Boundary Surface Boundary Surface option using profiles and directions. This results in the

same surface as Loft, smoother surface appearance.

Single curve to a

point in one direction

Direction 1

Direction 1

Direction 1

Direction 2

Direction 2


Surface Modeling in SW- Fill Surface


Thickening the

patched surface


Patching a freeform hole

Surface Modeling in SW- Freeform


Select the surface to

reshape



Four controls



Adding control

points to the edge

curve, select

Movable and click

on Add Points, pick

location

Surface Modeling in Creo



Sweep (constant cross section)

Sweep dashboard

select surface option

Sweep (constant cross section)

Ken Youssefi MAE 19

Constant cross section sweeps

a) Section (profile)

b) Trajectory (path)

Swept Blend (variable cross sections)

Ken Youssefi MAE 20

Swept Blend

Ken Youssefi MAE 21

All sections must contain the same number of

entities

A swept blend can have two trajectories: an Origin

Trajectory (required) and a Secondary Trajectory

(optional). Each Swept Blend feature must have at

least two sections and sections may be added

between these two sections.

Creating a Swept Blend Feature

Ken Youssefi Mechanical Engineering Dept., SJSU 22

Swept Blend Dashboard

Sweep type


Creating a Swept Blend Feature

option keeps each of the

features cross sections normal to the trajectory of the

feature. Each section is created normal to a vertex of the

trajectory or normal to a datum point on the trajectory. It

requires the definition of a trajectory and the definition of

one or more sections

option keeps the features

cross sections normal to a selected planar pivot plane, edge,

curve, or axis. Each section of the feature is created normal

to the selected pivot plane. It requires the definition of a

trajectory a normal plane and the definition of one or more

sections.

Constant Normal Direction

option keeps the features cross

sections normal to a second trajectory. Each section of the

feature is created perpendicular to the normal trajectory. The

option requires the definition of a sweep trajectory, a normal

trajectory, and two or more sections.

The Normal to Projection

The Normal to Trajectory


Creating a Swept Blend Feature - Examples

The Normal to

Projection

The Normal to Trajectory

Parallel Blend Feature Creo 2.0

(Parallel Plane Loft)

Ken Youssefi MAE ME20 25

Blend Creating the Datum Planes


Create two datum plans

offset from the Front

plane by 400 mm.

The three profiles will be

sketched on each plane Datum 1

Datum 2

Front plane

400 mm

400 mm

Parallel Blend


Sketch

the three

profiles

on each

plane

Parallel Blend


Select Sections

Choose Selected Sections

Click on Section1

Parallel Blend


Select the first

profile and then

click on Insert

Parallel Blend


Select the

second profile,

preview should

appear. Click on

Insert

Parallel Blend


Select the third

profile and Insert

End Options


Blends (Parallel)

Ken Youssefi MAE dept. ME20 33

Straight parallel blend

Wireframe showing the three sections

Blends (Parallel)

Ken Youssefi MAE dept. ME20 34

Create datum planes to sketch the sections

Parallel Blend Surface


Sections must have the same number if entities


Surface - Fill


A Fill feature is

simply a flat surface,

closed-loop feature

that is defined by its

boundaries and is

used to thicken

surfaces.

Surface - Style


Patching


Surface Style Edit Menu


Select Surface Edit Select the Surface

Freestyle Surface


Select a primitive

to start

Control points

(8x3=24)


Click on a Control point and

move the handle to reshape

the primitive selected. Grab

the center for free movement

or the tip of the arrows for

translation only

Surface Modeling in Unigraphics (NX)


Ken Youssefi PDM I,SJSU 45

Use this command to create a solid or sheet body feature that sweeps a

master cross section variably along a path. The master cross section

should be created using the Sketch on Path option in the Sketcher.

Sweep Command Variational Sweep



Sketch the rails

Select one of the rails to sketch the

section



Sketch the master cross

section, apply constraints as

desired, dimension the legs

Master

profile

Rails

Attachment points

to the rails

You can control the length

of the sweep by specifying

start and end values. You

can also control the sweep

by adding or removing

constraints from the master

cross section sketch



Surface model

The surface could be

thickened

4 Point Surface


Swoop Surface


Boundary Surface




Mesh Surfaces

This command creates a sheet or solid

body through a set of up to 150 section strings.

A section string can consist of a single object

or multiple objects, and each object can be a

curve, a solid edge, or a solid face. Through

Curves is similar to a Ruled Surface, except

that you can specify more than two section

strings.

Through Curves option


Surface Modeling in Unigraphics (NX) Desired curve sections



Through Curve option

This command creates a body from sets

of primary and cross strings. Strings in each

set must be roughly parallel to each other and

non-intersecting. Primary strings must be

roughly perpendicular to crossing strings

Cross strings

Primary strings



Sample of a Multiple Triangular

Patch Surface

N-Sided Surface option

This option lets you build a surface

with an unrestricted number of curves or

edges that form a simple, open or closed

loop, and assign continuity to outside

faces. You can remove holes in surfaces

that are not four-sided. Shape control

options are available to refine sharpness at

center point, while maintaining continuity

constraints.



You can use the Section option to construct

bodies through sections that you define using

conic construction techniques.

You can think of a section free form feature as

an infinite family of section curves lying in

prescribed planes, starting and ending on, and

passing through, certain selected control

curves. Additionally, the system obtains conic

end slopes directly from the control curves, and

uses a continuous 2D conic shape parameter to

vary the fullness of the sections along the body.

A typical application for using a section free form feature would be in the design of

an aircraft fuselage. The control curves would run along the top and along the

side of the fuselage, and the section curves would lie in planes perpendicular to

the centerline.

Another example would be in creating an automobile body panel design, where

you know the start and end edges and slopes, and a smooth curve without

inflections is required



Section Body Dialog Options

ends-

apex-

shoulder

The feature starts on the first curve selected, passes through an interior

curve known as the shoulder curve, and ends on the third curve. The slope at each

end is defined by a selected apex curve. See ends-apex-shoulder for details.

ends-

slopes-

shoulder

The feature starts on the first curve selected, passes through the shoulder

curve, and ends on the third curve. Slopes are defined at the start and end by two

independent slope control curves. See ends-slopes-shoulder for details.

fillet-

shoulder

The feature starts on the first curve selected, is tangent to the first body

selected, ends on the second curve, is tangent to the second body, and passes

through the shoulder curve. See fillet-shoulder for details.

three-

points-arc

Lets you create a section free form feature by selecting a starting edge

curve, an interior curve, an end edge curve, and a spine curve. See three-points-

arc for details.

ends-

apex-rho

The feature starts on the first curve selected and ends on the second curve.

The slope at each end is defined by a selected apex curve. The fullness of each

conic section is controlled by the corresponding rho value. See ends-apex-rho for

details.



Use the Studio Surface command to create swept or lofted surfaces

from a network of section strings, or a network of section strings and up to

three guide strings.

Section string (1), guide strings (2), and

resulting studio surface

You can modify a Studio Surface without rebuilding it by adding, removing,

reordering, or swapping section and guide strings. Studio Surface also lets

you specify constraining faces and continuity, edit surface alignment points,

and control the transitions between surface sections.

Three section strings and

resulting studio surface

Studio Surface


Add sections to the model

Add controls

Studio Surface


Transition Control options let you

choose how a surface transitions from

one section to another, and are

available only when you choose the

By Points Alignment option.

Consider the following sample surface

built from four section strings:

Studio Surface


To specify a tangent constraint face, choose G1 from the Start list, click Constraint Face , and se

Snipping


Lets you divide a surface at a specific point, or snip off unneeded portions of a surface.

Snipping a surface with a curve at a specific point, or snip off unneeded

portions of a surface.

6 - surface modeling nx sw

Documents

patched surface ken

sw swept surface

coons surface

sw boundary surface

surface shape direction

direction direction

location surface modeling

controls surface modeling