ODD SHAPED ENCLOSURE Design Using NX Cad Challenge_2_Box Assembly

DESIGN SHEET METAL ODD SHAPED ENCLOSURE USING SIEMENS NX_CAD 12

OBJECTIVE

• To learn how to convert a solid body to sheet metal
• To create a odd shaped enclouser design using siemens nx_CAD wth industrial work flow

INTRODUCTION

The sheet metal parts can be found from the small light fixtures to the automotive body parts because of their high strength despite having low weight and its resistance to corrosion. Based on the requirements and the standards sheet metals of varying thickness are used. The sheet metal comes from various materials such as steel, aluminium, brass, titanium and more. sheet metal application provides an the envinornment for the design of the sheet metal part in machinery, automotive, enclosures, brackets and other parts normally manufactured with a barke press

Sheet metal application widely used in

• Aircraft Bodies
• Automobiles
• Utensils used for domestic purpose
• Beverage cans

SOFTWARE USED

• SEIMENS NX_CAD

Unigraphics NX (also known as Siemens nx) is an advanced High-end CAD/CAM/CAE software package originally developed by UGS Corporation, But since 2007 it is owned by Siemens PLM Software. It is used, among other tasks, for Design ,Engineering analysis ,Manufacturing finished design by using included machining modules

DESIGN METHODOLOGY

The design methodology used for this projet is summarized in the below flow chart.

DESCRIPTION

CREATION OF SOLID BODY

Sketch the appropriate shape in XY plane and with the help of EXTRUDE commend extrude the shketch to 200mm to form a solid.The solid feature can be created either in modeling environment or sheetmetal workbench

SHEET METAL CONVERTON

This is a very powerful and useful tool offered by NX. It can form a sheet metal part from any dumb solid part or from any parametric solid body. It requires an adjacent plane face to be able to apply this feature. In this first the faces has to selected for web or flanges then the edges has to be seleted for bends.

FLANGE

The flange is an additional face created from any edge of the existing sheet metal component. It is additional material connected to any face or edge which is bent from the respective edge or face. It can be at any position or at any angle.

JOG

This feature allows a flange or a tab to bend following a specific curve on the surface of the flange or tab and extend it to its original length. It is like lifting one side of the flange or tab from the curve.In this a stright line is drawn in the right side face of the enclouser then the jog feature is applied with the reference to the line

UNBEND

This feature allows all the bends made by the various features to the unbent state at once. In order to achieve a flat configuration of the sheet metal as per the design intent, it is necessary to choose the bends in order.

BEAD

Beads are the features added in sheet metal components in order to increase the stiffness of the component. Beads require a sketch in order to apply the feature. It can be either an open or closed profile.

HOLE

This feature helps to create holes in the sheet metal. This requireds one face and points to position the holes. In this six general holes of 10 mm radius are created while in the unbent state.

REBEND

After adding all the feature in the sheet metal with the help of REBEND feature we can rebend all the unbent the sheet metal to its orgnal form

Flat Pattern:

Flat pattern is the representation of the entire sheet metal component in the 2D form of the flat sheet metal with all the bends, cut-outs, holes, and additional features in the form of lines or edges. The flat pattern ensures the ability to cut the sheet metal out of the raw sheet metal plate. It removes the possible errors such as interference or collision within the same component. The flat pattern of this enclosure indicating the bend radius, bend angle, and bend direction are shown below.

Drafting:

Once the design is completed, the execution or the manufacturing of the component requires a technical drawing of the component with the provided scale and with accuracy. The necessary details such as annotations, callouts, bend tables can be added as per the requirement. For this box assembly design project, a drawing is created out of the flat pattern in a 1:2 scale in an A4 sheet.

DIFFERENT VIEWS OF THE DESIGN

FRONT VEW

RIGHT VIEW

TOP VIEW

ISOMETRIC VIEW

CONCLUSION

Thus the modeling of the sheet metal odd shaped enclouser has been succussfully completed and the bacis features like sheet metal from solid, flanges, bead, jog, holes, replace view are learnt and applied in the design using SIEMENS NX_CAD 12.