Advanced Sheet Metal Design Using NX Cad Challenge_6_Bracket

TITLE:

Design of sheet metal bracket using NX-CAD

OBJECTIVE:

To design the sheet metal bracketusing NX-CAD and also draft the flattened sheet metal design.

INTRODUCTION:

Brackets are connecting devices used to join two objects. In architecture, they may be made of wood or stone and used to join walls with features like parapets or eaves. In engineering, however, they are often made of sheet metal and used to support objects like shelving, countertops, flooring, sections of furniture, and mounted televisions.

Although there are many types of brackets, they are most commonly L-shaped, with the vertical section of the bracket attached to a wall (or another large upright structure) and the horizontal section attached to a smaller object being fitted to the wall, such as a shelf.

Brackets often have holes in them, either threaded or unthreaded, so that screws or other fasteners can be fed through them, but this is not a defining feature of the bracket.

Most brackets are functional, with their purpose being to connect and support objects. However, brackets can also be decorative: since brackets are often visible (such as on shelves mounted above eye level) they may have cosmetic features and flourishes, from intricately machined decorative features to gold plating.

Flowchart:

• Contour flange
• Cutout
• Break corner
• Unbend
• Bead and hole
• Rebend
• Drafting

PROCEDURE:

1. Create Contour flange

• First of all open the NX-CAD file and create new sheet metal file with proper naming.

• Next open the sketch option from direct sketch tab and select the XZ plane, specify the horizontal vector as X vector and specify the part origin.
• Draw the front view as sketch with dimensions shown in reference diagram at origin (0,0,0).

• Modulate the skecth into contour flange by selecting the contour flange option from bend tab and choose the lines, enter the thickness value as 3 mm and width as 200 mm.

2. Create normal Cutout

• Draw outlines from the reference image using sketch from direct sketch tab.

• Cutout the outline sketch by choosing the normal cutout command on feature tab and enter the value as 35 mm depth and cut method as thickness.

3. Break corners

• The flanges has sharp edges use break corner from corner tab and radius value as 25 mm, 30 mm, 60 mm respectively by refering the corners given.

4. Unbend the 3D sheet to flat sheet

• Unbend the 3D sheet metal design to flattened sheet metal, by using unbend command from form tab and select the edges and adjacent faces.

5. Create bead and holes

• Use bead option from punch tab, to create a circular embose for 7 mm in depth,7 mm in radius, end condition as formed and also select the black triangle to expand the options where rounding section set die radius as 5 mm.

• Create holes at ends of the sheet by using direct sketch tab>sketch>points positioning one at end of bigger side and two at center of each fillets in bottom end.

• Use the reference points to create holes by using inputs like hole type as general hole, form as simple, diameter size as 20 mm and depth limit as through body.

• Verify the distance between bottom end holes using simple distance option in analysis tab which is 35 mm.

6. Rebend the flat sheet to 3D sheet

• Use rebend command to return the flattened sheet to 3D sheet design from rebend command in form tab by selecting the bend and flanges orderwise.

7. Draft the flattened sheet

• For drafting, select flat pattern command and click the base face.
• Flattened sheet is not visible, to view it untick the rebend part from part navigator and save the file.

• The flattened sheet should be of an A4 size sheet so open the new file> drawing> A4-size> select ok.

• Use base view from view tab and place the flattened sheet in draft and save the file.

RESULT:

• Draft of sheet metal bracket

• Isometric view

• Top view

• Front view

• Sideview