Hood design-Week 2
Design of an Automotive hood
Automotive Hood:
Is the hinged cover over the engine of the motor vehicle that allows access to the engine compartment, or trunk for maintenance and repair. It is split into two sections, one each side, each hinged along the centerline. A further variant combines the bonnet and wheel arches into one section and allows the entire front bodywork to tilt forwards around a pivot near the front of the vehicle.
Hoods are typically made of the same material as the rest of the bodywork. This may include steel, aluminum, fiberglass, or carbon fiber.
Release/safety and security mechanisms
The hood release system is common on most vehicles and usually consists of an interior hood latch handle, hood release cable, and hood latch assembly. The hood latch handle is usually located below
the steering wheel, beside the driver’s seat, or set into the door frame.
The Mechanism and assembly
The above diagram shows us how the latch and striker are assembled in a given vehicle, through which the latch is held securely in place on the hood and as it makes it way down the strike the lock, its held tightly and firmly in place without any rattle or vibrations. Image for example
Master section for the hood design and hemming region
Hemming
Is a sheet metal forming process in which sheets are joined by bending it, usually to 180`@`Automotive body panels and parts such as deck-lids, trunk-lids, doors, hood, and tailgates are formed by the hemming process.
Types of hemming process are press hemming, table-top hemming, and roller hemming
Design of the outer panel
This Design was made possible through the help of a surface, which was later offset to a distance and the necessary hemming along with the corner relief. Finally, the section was mirrored and sewed. The two sections together forming the complete outer panel of the hood
Design of the inner panel
This design was done through a layer of offset surface, which was joined to each edge through law extension and extend sheet command. The later was then filleted giving it face blend and edge blend. Emboss was made on the panel giving it strength and stability. Later, the hinge mount, latch reinforcement was created giving the panel strength for its mount brackets. Finally, the section was mirrored across and sewed together creating the inner panel.
Emboss
Is simply to raise the surface of it, with the form of relief. This process can be made employing matched male and female roller dies, or by-passing sheet or strip of metal between rolls of the desired pattern.
Forces and mastic zones on the inner panel
The arrows directed towards the hinge show that the forces dissipate towards the hinge so that the force delivered to the passenger is compared less during the frontal crash. The mastic points shown on the diagram denoted by the black points indicate that the outer panel and inner panel are glued together during the process to give it stability and strength.
Assembly of the hood
Reinforcements were added to the latch and hinge mounts, giving it a thickness of 1.5mm.
Next, the hinges were mounted, keeping its axis aligned with the mirrored assembly
Finally, the assembly was complete having its assembly constraints.
Making sure the trajectory of the rotating hood is perpendicular to the mid-point of the hinge axis.
Therefore, the hood was completed keeping all the dimensions well and fully defined.
Images of the hood
Therefore, this completes the report on how the hood was designed from scratch
Link to the models that were created
https://drive.google.com/drive/folders/1itvkh8F6R_4kKKCQA8B-YAw1B74hVIUM?usp=sharing