Hood design-Week 2

Design Considerations:

Hood is an automotive body panel that covers the engine compartment. Hood consists of Inner panel and outer panel; Inner panel is used to provide strength whereas the outer panel works as a metal cover for the engine compartment.

The inner panel (0.75 mm thick ) and outer panel (0.75  mm thick ) are joined by process of Hemming, where the outer panel wraps around the inner panel, and the mastic sealant is applied between them.

Embosses are provided in the inner panel to improve the strength of the inner panel and to dissipate the energy outside of the car body rather than inside the car body.

For Latch emboss a trajectory circle should be drawn based on the Hinge axis.

Master Section considered

Hood Assembly

Hemming :

Hemming: Hemming is a forming operation in which the edges of the sheet are folded or folded over another part in order to achieve a tight fit. Normally hemming operations are used to connect parts together, to improve the appearance of a part, and to reinforce part edges.

In-car part production, hemming is used in assembly as a secondary operation after deep drawing, trimming and flanging operations to join two sheet metal parts (outer and inner) together. Typical parts for this type of assembly are hoods, doors, trunk lids, and fenders.

Hemming is created with the required relief:

Inner Panel with embosses to dissipate energy 

The Trajectory of Latch

Mastic Points: The Mastic Sealant is placed between inner and outer panel which oozes out and bonds both the panels.