SHEET METAL BRACKET USING SIEMENS NX CAD 12

3D CAD MODELING OF AN SHEET METAL BRACKET USING SIEMENS NX CAD 12

OBJECTIVE

The purpose of this project is to design an aesthetic CAD model of an sheet metal BRACKET using siemens NX_CAD sheetmatal workbench.Also to perform the drafting for the model.

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

Contour Flange:

The contour flange is a flange created using the open sketch created in a plane. It is different from regular flange because it can be created in any shape and it does not require choosing the edge of any tab or existing flange. It can be at any position or at any angle. For this bracket design, a contour flange is created using the earlier sketch as the curve.

NORMAL CUT-OUT:

A sketch is drawn on the plane to cut away the unnecessary material. Then the operation normal cut out is carried out. It removes away the material with respect to the sketch plane.

Break Corner:

This feature breaks the sharp edges in the corners and makes it round or adds chamfer. It is like the fillet feature in some other CAD software. It prevents the fracture breaking of the sharp corners.

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.In this a stright line drawn in the top face and with the referance of the line bead feature is applied

HOLE

This feature helps to create holes in the sheet metal. This requireds one face and points to position the holes. In this 3 general holes of 25 mm radius are created while in the unbent state.

Local Radius Analysis:

The radius value of the parts can be easily measured or analyzed by using the local radius tool under the tab ‘Analysis’. Here, the local radius of the bead and the bend radius is measured and shown.

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:

After the design is complete, 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.

DIFFERENT VIEWS OF THE SM BRACKET

FRONT VIEW

RIGHT VIEW

TOP VIEW

ISOMETRIC VIEW

CONCLUSION

Thus the modeling of the sheet metal BRACKET has been succussfully completed and the bacis features like contour flanges, normal cut out, break corner, bead, holes, local radius analysis are learnt and applied in the design using SIEMENS NX_CAD 12.