Hood design-Week 2

HOOD DESIGN

OBJECTIVE

To design the Hood/bonnet of the car by using the master section provided in the challenge and using a standard procedure which is used by the OEM Manufacturers.

PROCEDURE TO CREATE HOOD OUTER AND INNER PANEL

1. The styling department gives the outer hood panel. The given outer hood panel is kept in a feature group named as parent file.
2. Trim the body to xc plane using the TRIM BODY command.
3. Offset the surface with 0 mm using OFFSET SURFACE. Keep the offset surface in the feature group and name it as a working file.
4. The hood inner panel master section is given. According to the given dimensions in the master section, the surfaces are created using commands: OFFSETSURFACES (2 mm, 4 mm, and 25 mm) OFFSET CURVE IN SURFACE(20 mm, 40 mm and 55 mm), TRIM SHEET, THROUGH CURVES, and FACE BLENDS(6 mm and 15 mm radius).
5. Now offset the curve to the inner panel and select EMBOSS command and give an angel higher than 7 degrees on the side of punching and create an emboss plane.
6. As the car collides, the forces should not travel perpendicularly, so on the embossed area, sketches are given so that the forces travel sideways.
7. To create these faces, LAW EXTENSION, TRIM & EXTEND commands are used. FACE BLEND and EDGE BLEND commands are used to give fillets.
8. TRIM SHEET command is used to cut the sheets inside the emboss.
9. Then the datum plane is created parallel to the inner panel region to create support for the hinge and latch sections.
10. The latch has attached to its position.
11. All the features are then placed in the feature group.
12. The hood outer and inner panel is extracted as a body and named Hood outer and inner panel.

MANUFACTURING METHODS TO CREATE THE HOOD INNER PANEL

EMBOSS: To create the emboss, DEEP DRAWING manufacturing methods are used.

HEMMING: The roller hemming method is used to attach the outer hood panel to the inner hood panel.

CONCLUSION

The outer hood panel and inner panel are created using the NX CAD software. The commands like EMBOSS, FACE BLEND, LAW EXTENSION, EDGE BLEND, OFFSET SURFACE, DATUM SECTION, OFFSET CURVE ON THE FACE have been studied and got a good knowledge about these commands.