Types of fenders:

Full Bumper Type:

The full bumper type is the traditional type of fender where more material consumption is observed. This type is used in the old designs of automobiles where it increases the overall weight and thus reduces performance. The maintenance also relatively more due to more surface.

Half Bumper Type:

Half bumper type is the modern design where less material consumption is observed, so productivity increases by reducing the size of the blank and thus providing more performance. The maintenance also relatively low compared to the full bumper type.

We are changed from full bumper type to half bumper type to reduce the scrap rate per blank. In the full bumper, we can only produce one Fender per blank, whereas as a half bumper type we can produce 2 fenders per blank.

Wheel arch :

Te wheel arch is a semicircular paret positioned above the wheel of a vehicle. The design of the wheel arch will be different based on countries and the main goal is 

designing of fender wheeel arch should satisfy the regulations and standards as per the countries

REGULATIONS PRESCRIBED BY THE COUNTRIES :

JAPAN REGULATIONS STANDARD:

• The clearance L is more than 5 mm should be following in the japan regulation 

and standard

• Take an angle of 30 degree, 50  degree and 90 degree and from then centre of the wheel and create a vertical line B , A , C as shown below  L value has been measured between point of B,A, C  and edge boundary of the fender wheel arch 

US REGULATIONS STANDARD:

• The section that we are going to measure L ewill be divided from -10deg to 190 deg from the centre of the wheel as shown in the below fig
• The clearance L is more than 5 mm should be followed in US regulation and standard

EUROPEAN REGULATION STANDARD:

• The clearance L will be more than 10mm at the section of SB, SA, SC, SD , SE 
• The section SA will be 90 deg from the centre of the wheel 
• The section SB will be 30deg from the line SA
• The section SC will be 50deg from the line SA
• The section SE will be 150mm from the horizontal from the point of centre
• The section SD will be at a distance between SC  and SE.

European standard calculations on the provided fender wheel arch fender

The provided wheel arch is 

First of all create a point by taking the reference of the outer most circle and mark the point on the gender wheel arch centre.

Then create an datum plane  by using the point and the direction commnad .

Then creat a sketch according to the standard sketch followed in the European standards

Now mark the SA, SB, SC, SD, SE pooints in the sketch 

Now calculate the distance of the gap between each line with respect to the fender wheel arch edge 

Distance of SA with the wheel arch edge 

Distance of SB with the wheel arch edge 

Distance of SC with the wheel arch edge 

Distance of SD with the wheel arch edge 

Distance of SE with the wheel arch edge

Now compare with the required regulation and standard values of the Europe and comes to conclude whether is good or need modification

 Basically the value of the gap needs to be measured from the lines of SC, SD, SE   to the wheel arch edge from inside but the gap here is measured from the outside as the lines are protruded to the wheel arch from ouside  so it is  a positive difference which clarly shows that the lines SC, SD,  SE clarly fails the European standards of regulations 

Conclusion:

After all measuring the values of the gaps bewteen the lines SA, SB, SC, SD, SE the respective values of the gaps arenoted and observed that the line SB only clars the European regulation and the standard desifn of the fender arch by claiming a gap of 10mm between the wheel arch edge and the projected line  and the remaining lines SA, SC, SD, SE clarly fails and hence we need to report to the fender designer to make changes in the dimensions so, that the European standard of regulations is satisfied