Advanced Sheet Metal Design Using NX Cad Challenge_1_Casing Design

Modelling of Casing in Siemens PLM NX 12

By

Santhoshsivan.G

Introduction:

In this model, we learn how to create casing model on siemens PLM NX 12 by using some tools like tab, datum, Cutout, Bend, unbend, flange, etc.

This are the following tools use to create casing model.

1. Tab
2. Datum
3. Bend
4. Unbend
5. Flange
6. Break corner
7. Dimple
8. Bead
9. Mirror feature

Step by step procedure to creating this model as shown in flowchart.

1.Datum coordinate system:

Datum coordinate system is the base plane for creating the components, which means the objects are created relative to some aspects, such as point, plane or axis. In this system have three categories. They are,

• Machine coordinate system
• Absolute coordinate system
• Work coordinate system

In machine coordinate system mainly used for CAM. CAM stands for computer aided manufacturing which means it’s used in this sectors CNC, VMC, etc.

In absolute coordinate system means to define a parametric location for an object such as point, or centre of an arc. In absolute coordinate system does not change or move. It provides a fixed point in space from which to begin modelling

In work coordinate system means the object is still used to determine the orientation and the origin. In WCS is moved nothing else go with it.

2.Tab:

Tab means, the command which is used to create a base feature by extruding the sketch along a vector by a thickness value or by add material to existing face and bend the region of a sheet metal part.

3.Bend:

Bend means to turn the model reference of a line that lies on the sheet metal. To select the command by select menu-->Inser-->Bend-->Bend.

4.Flange:

Flange means to create abend between two walls. The flange ca only be made on a straight edge. By creating flange select menu-->Insert-->Band-->Flange. In flange they are three types is there as following below

1. Contour flange
2. Lofted flange
3. Hem flange

5.Break corner:

Break corner means which use to round or chamfer the sharp corners of a tab or flange (similar to fillet).

6.Dimple:

Dimple command adds a dimple to a flat sheet by deforming it. To activate dimple command, click Home-->Punch-->Dimple on the ribbon bar.

7.Bead:

Bead is nothing but it similar to punch and dimple. By creating the bead select the sketch and click Home-->Punch-->Bead on ribbon bar.After that bead propertie manager appears, then give the value (depth,radius,etc) then click ok or apply.

8.Mirror face:

Mirror feature is useful application for creating the objects and also improve the accuracy of the sketches and reduce time for creating.

Modelling of casing:

By modelling the casing, they are some commands are used for complete the casing model. Flow chart shows the process and how to create step by step.

First select the sketch and create it. After creating the sketch select the tab and give the required values in tab property manager. Then make the cut out by using normal cut out.

Draw two horizontal lines for bending. Click bend option and select the line, after selecting give required value (angle, directions etc) and click ok. Then rebend the sketch for flange by creating flange select the corner after selecting the flange option. As usual give or modify the values and click ok.

Most important thing is removing any sharp edges in our model by using break command option. In break corner property manager select all corners by dragging or indidual selection. Give radius value and click ok.

Simple screw hole means to creating the hole on the model. By using hole command. Click hole option in ribbon bar and select the sketch for hole after selecting give value and select type of hole and click ok.

Then draw the sketch for dimple and beads. Dimple and bead mean to make the punch/profile of that sketch in the model. Dimple/bead as discussed previously. After creating dimple and bead in the model. Use mirror command to create other beads on the sketch.

Creating the component start drafting. It means it is a two-dimensional drawing used by engineers for identifying the dimensions and required tools for creating product.

Casing Model:

Drafting:

Conclusion:

The modelling of casing as completed in PLM NX12. While creating the casing, understood the function and uses of the tools.

Casing:

1.Front view:

2.Right side view:

3.Top view:

3.History tree:

5.History tree 1: