Hood design-Week 2

HOOD DESIGN : 

Car HOOD or also known as BONET , is the cover part of the engine, as it protects the engines from outside environments. The basic function of this hood design is to  reduce the accidents of people on the pedestrain as design in this way that whenever hit by something , force coming from hitting will get absorbed by the hood  pannel , as we have given the cut outs shape by doing emboss in the inner hood pannel.

 

 THIS hood design made up of various components :

1. Hood outer pannel:  It is the outer part of the hood, it is the cover of the hood inner pannel and design to give aesthetic look. Thickness of the outer pannel is 0.75.

 

FEATURES USED:

2.  Hood inner pannel:

Hood inner pannel design from the parent hood  of outer pannel , hood inner pannel design in such a way that it protects from the happening of accidents . It gives strength to the hood outer pannel , in this embosses  is design for the hinge section and lach and striker section. The thickness of the inner pannel is 0.75 .

2D Design of the inner pannel is given below .

 

FEATURESS USED  IN THE INNER HOOD PANNEL:

feature Tools are used while designing the hood  are :

1.Wave geometry linker : it is used to bring any object into present sketch .

 2. Trim body : it is used to trim the body .

3. Offset in face : it is used to offset the curve in that face only .

4. Offset surface : it is used to offset the whole surface .

5. Trim sheet : it is used to trim the sheet part. 

6. Through curve : it is used to fill the gap between two curves.

7. Edge blend : it is used to give smoothness to the edges by giving edge blend.

8.  Projected curve : is used when we do sketch then to project the sketch curve wherever we required.

9. Mirror geometry : it is used to mirror the same geometry .

10.  Sew : it is used to join the two object together to form one .

 11. LATCH TRAJECTORY : It is given so that , striker will come in the middle of the hood , trajectory is given in such that , line drawn to hinge axis and datum plane created in the middle of the line , from there a circle is created for trajectory and also the opening angle of hood , in addition to this , a line drawn to the striker middle and will gives constraints relation between them, to place the emboss of the striker position.

12. EMBOSS  :

EMBOSS is given to the inner pnnel in a differnt different shapes and sizes , it increases stiffness to the inner pannel and also emboss shapes and sizes design in such a way that force is distributed , which  protects from frontal collision .

 

13. Thicken : it is used to the thicken the sheet .

 Some other operation done in the hood paanel according to design consideration 

 

1. Mastic seal : it is used for joining the surface between the inner pannel hood to outer pannel hood. This mastic seal are elastic compound , which behaves like a rubber.  it is provided ,where we have given the cut outs in semicircular shape in the emboss region , as every region of mastic sealants has its effects around a circular region of approx 80mm diameter. in this other operation of joining these surfaces , cannot be performed , because of suface finish will not come in a correct manner , so for aesthatic look , we provide with these mastic sealants.

 

 

2. Hemming :   It is a forming operation , in which joing the boundaries of two surfaces, in order to achieve a transition fit. here we have provided the inner hood pannel to the outer hood pannel boundaries by doing law extension of outer hood pannel then by folding them to the inner pannel. hemming process done mainly by the rolling the hem part , to obtain a better accuracy.

 

   3.   Relief : It is given after the hemming operation done in the outer pannel , to avoid the crumbled of the hemming operation at ther corner side , therefore  relief is provided.

here, front and real relief provided in the outer pannel.

 4. REINFORCEMENTS : reinforcements is done to provie the strength to weaker section of hinge left and right part and striker part. As after placinf the hing and striker after embosing the sheet becomes thin there , so to provide reinforcements , having thickness value of 1.5 mm. 

. HING REINFORCEMENTS LH ( LEFT HAND )

 

HINGE REINFORCEMENTS RH ( RIGHT HAND )

 STRIKER REINFORCEMENTS :

ASSEMBLY :

In this nx cad software, in assembly section only we did everything , like the part inner panel  created. then hinge and striker has to place in thier position by applying the assembly constraints .

conclusion :

I have designed the car hood pannel along with the assembly using nx cad software.