Hood design-Week 2

Design Explanation

• NX Cad Design start from given Class A outer pannel surface
• Initially start design of hood inner pannel using given master section
• Hood inner pannel consist of hinger ,striker locking positions, reinforcement structures and emboss.
• Offset cure in face,offset surface,trim and extend,law extension,projected curve,face blend,trim sheet,mirror geometry, sew and thicken tools are mostly used design in NX CAD .

Hood Inner Pannel

• Same us to create hood outer pannel .

Hood Outer Pannel

Hood Assembly

• Assembly workbench used to assemble the hood inner pannel,outer pannel,Latch striker and hinger components.
• Move components, constraints(touch,rotate,translate) tools are used to Assemble the process

Master solid Section

Hemming assembly

Hinger & Striker Asembly

Reinforment Structure

Hood

• The hood or bonnet is the hinged cover over the engine of cars.
• Hoods can open to allow access to the engine compartment for maintenance and repair.
• The hood consist of Outer pannel,inner pannel, striker, mastic and hinger components.

Latch Trajectory

• Its is used for lock the hood with another pannel.
• Its weld inner pannel bottom side of the hood.
• Common using U shape.

Hemming Process: -

• 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.
• Two types of hemming process

1. Conventional die hemming

2. Roll Hemming

Emboss

• Emboss has been given to create extra strength in inner panel and embosses design needs to be inspired by force dissipation.

Mastic Points-

• Mastic point are areas where the inner hood panel is joined with the outer panel hem using a mastic glue. This mastic glue keeps the inner panel stuck to the outer panel.
• The main purpose of the outer panel is for the aesthetic look. Thus, we cannot use bolt or welding.
• This has to be done with the helps of the hemming and mastic sealants.
• Mastic sealants are elastic compound that behaves like rubber.
• It is placed between the outer and inner panel.
• Initially is it in paste form but after the hot furnace bath it gets hardened thus joining the outer and inner panel.