Surface Modeling NX

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.


Surface Modeling in SW – Ruled Surfaces

Extrusion direction

Profile

Extruded surface

Revolved surface

Axis of rotation


Surface Modeling in SW

Guide

Swept surface using a Guide


Surface Modeling in SW - Ruled Surfaces

Guide 1

Guide 2Loft surface, no guide curve

Loft surface using two guide curves.


Surface Modeling in SW- Boundary Surface

Sketch1, Direction 2



Open loop 3D sketch, Direction 1

Four curves defining the boundary of the surface, Coon’s 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 SurfaceBoundary 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


Surface Modeling in Unigraphics (NX)

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

Documents

Surface Modeling NX