Advanced Sheet Metal Design Using NX Cad Challenge_5_Odd Shaped Enclosure

Title(‘Procedure to design sheet metal part for odd shapes using siemens NX- Sheet metal Application’)

Click to view Project                                                                     Shaik_Thasleem_Ansari

Objective:

The main objective of this project is to Create a sheet metal of odd shapes by using Sheet Metal from solid feature.

Introduction:

NX, formerly known as "Unigraphics", is an advanced high-end CAD/CAM/CAE, which has been owned since 2007 by Siemens PLM Software.[1][2] In 2000, Unigraphics purchased SDRC I-DEAS and began an effort to integrate aspects of both software packages into a single product which became Unigraphics NX or NX.

It is used, among other tasks, for:

Design (parametric and direct solid/surface modelling)

Engineering analysis (static; dynamic; electro-magnetic; thermal, using the finite element method; and fluid, using the finite volume method).

Manufacturing finished design by using included machining modules.

Design methodology:

The above shown flow chart explains about the design methodology of designed sheet metal casing. First we need to create a tab of required dimensions later we have to use some features like Flange, Break Corner, dimple, etc. to design a sheet metal casing.

Features used:

Sketch: This feature is used to draw line, circle, rectangle, etc.

Extrude: this feature is used to create a solid block from the sketch.

Sheet metal from solid: Builds a sheet metal model that takes the shape of dumb body.

Bead: this feature is used to lift an area of model inside a sketch which simulates a stamping tool.

Hole: this feature is used to create Hole to the block.

Unbend: this feature is used to unbend the sheet metal.

Rebend: this feature is used to reminds original form of the sheet metal.

DESIGN PROCESS:

Units:

This project has been done using Millimeters as the base unit.

Processes:

Creating a solid body;

Exturde modeling feature is used to create a solid body, this body further used to creat a sheet metal by using sheet metal from solid feature.

Sheet metal from solid:

Builds a sheet metal model that takes the shape of dumb body. The edges of the solid feature is considered as bends during converting solid body in to sheet metal.

Flanges

Using proper edges as a reference, the corners of the bent faces were modified to include flanges. This was done using the Flange feature.

Jog:

This feature is used to create flanges according to sketch given by the user, with this kind of feature it is easy to create difficult sheet metal structures. With single use of jog we can create double flanges which can be modified.

Unbend

For the creation of additional features like holes, the bent portions were straightened using the Unbend

feature which was done by the systematic selection of the bent corners.

Adding Beads

Using a similar algorithm to that of a dimple, the Bead feature creates a proper modification using a circle as the base sketch. Four beads are created in total, with the first one being mirrored about the proper plane to create the remaining. Both the dimple and the bead are features under the Punch category in Sheet Metal and signifies a stamping process.

Holes:  

this feature is used to create holes on the sheet metal at where ever we want.

Rebending:

The final process consisted of reverting the model back to its original configuration by modifying the unbent edges using the Rebend feature. The path followed while unbending was repeated in a similar manner while rebending to ensure proper result.

Views of Sheet-Metal Casing:

Front View:

Top View:

Isometric view:

Side view;

Flat pattern view:

Drawing Sheet Image:

Conclusion:

Complex sheet metal shapes has been obtained by using sheet metal from solid feature of NX CAD software.