Advanced Sheet Metal Design Using NX Cad Challenge_1_Casing Design
MODELLING OF SHEET METAL CASING
OBJECTIVE
In this challenge we are going to modelling a sheet metal Casing using Siemens NX CAD and also a detailed explain about the sheet metal tools used for the operation.
DESIGN METHODOLOGY
DESCRIPTION
Create new file of sheet metal model
Then set the Sheet metal preference to 1mm
Then start new sketch the draw a rectangle of 60 X 50 mm dimension.
The sketch is the fundamental base element for any feature in the design of any sheet metal component. The very first step is to create sketch which is then used to create tab or the base feature.
then Tab
The tab is the very first feature in any sheet metal process. All the other feature of the sheet metal in Siemens NX are based on the base feature or tab. A tab is created after sketch is created in any of the plane. The tab is always the parent feature for other feature following it.
Then create another sketch
Then Normal Cutout.
The normal cutout helps to cut or remove material by projecting a sketch into the model and then cutting perpendicular to the faces. In the design of casing we used a rectangular sketch and applied normal cut-out with reference to it. We can specify sketches or 3D curves to apply normal cutout.
Then another sketch for bending
Then Bend
Bend feature is added wherever the bend in the sheet metal required. A sketch is required to create a bend. It can be an open profile and it can be either a straight line or curve.
Create Flange
The flange is an additional face created automatically from any edge of the existing sheet metal component. It is additional materials connected to any face or edge which is bent from the respective face or edge.
For inner flange select outer liene and
for outer flange select the iinner line
Filet the sharp corner using the Break corners
The Break corner feature breaks the sharp edge in the corner and make it round or adds chamfer. It prevents the fracture breaking of the sharp corners.
Unbend the feature
Unbend is the very powerful and useful tool in the Siemens NX. It allows all the bend made by various feature to the unbend state at once.
Draw sketch for hole
Then hole using Hole tool
Hole feature in the sheet metal workbench is just like in the model workbench. It can be created simple, counter bore, counter sink or tapered holes.
Draw sketch for emboss
Add dimpel for the emboss
Dimple in the sheet metal component provides more strength and rigidity to the flat structure of the component. Dimple features is created using the sketch created in any face or any flange in the sheet metal components.
Create sketch for bead operation with diameter 5mm
Then Bead operation
Beads are the features added in the 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 open or closed profile. Mirror feature is used to make symmetry by selecting a feature in respect of user defined plane or sketch.
Then rebend
All feature added after the unbend feature are added in the unbend state itself. After the addition of sketches and additional features are completed, the sheet metal components has to be re bend to the required position.
then do flat pattern and create the drafting
Flat pattern is the representation of the entire sheet metal component in the 2D form of the flat sheet metal with all the additional feature in the form of lines or edges. It removes the possible errors such as interference or collision with in the same component.
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.
Model screenshots
Front view
side view
Isometric view
Top view
CONCLUSION
Finally the modelling of the sheet metal casing using NX CAD has successfully completed and though this project I can able to know the various GUI of NX and different comments and tool use in various sheet metal modelling.