Fender Design

FENDER DESIGN USING NX CAD

INTRODUCTION

The fender is the side frontal portion of the vehicle, which protects the pedestrians

from small dust particles. There are five mounting regions in the fender

1. Body mounting

2. A-pillar mounting

3. Sill mounting

4. Cowl mounting

5. Drip mounting

The master section of the fender is given as

PROCEDURE TO DESIGN FENDER IN NX CAD

The fender master section is obtained from the styling department. The mounting

regions have to be designed in NX CAD.

As given in the master section, the drip area in the fender is designed.

1. Offset the curve with a 5 mm distance on the surface of the fender using OFFSET

CURVE ON SURFACE command.

2. Draw the curve on the surface where the A-pillar has to be mounted using CURVE

ON SURFACE command by taking the end of the curves as intersections. So a

smooth curve can be drawn, but for dimensioning purposes, the sketch can be drawn

and projected.

3. Draw the curve near the sill mounting.

4. Using the TRIM SHEET command, cut the extra sheet between the A-pillar

mounting and sill mounting.

5. Now, from the car front bumper side with a 10 mm distance, draw a DATUM

PLANE with a curve on surface selection and 150 mm distance create a datum plane.

6. Same create a datum plane from the A-pillar mounting with a 200 mm distance.

7. Between these two regions draws two curves using CURVE ON SURFACE

command.

8. Trim the sheet from the bumper mounting and the A-pillar mounting to get the drip

area.

9. Using LAW EXTENSION command, create the drip area the same as given in the

master section.

10. Use FACE BLEND and EDGE BLEND commands to make the smooth curves.

11. For mounting, the screws flat surfaces are required. For the flat surface, create a

datum plane with DATUM PLANE command and choosing three points on curves.

12. Daw a rectangle and a circle. The circle should be 5 mm, and there must a 5 mm

clearance surface around the circle.

13. project the curve on to the surface using the PROJECT CURVE command.

14. Use EMBOSS command with end cap option as datum plane at an offset of 3.5

mm and 15º draft angle (a minimum of 7º is required).

15. Trim the sheet to form the holes.

16. For smooth curved edges, give an edge blend of a 3 mm radius for all the

embossed edges.

17. Ribs can be created on the mounting region were ever required to increase the

mounting strength. DART command is used to create the ribs.

18. The same procedure is followed in all the mounting regions.

19. The fender is thickened with 0.75 mm using the THICKEN command.

20. For signal lights, the hole can be created on the fender panel.

CONCLUSION

From the fender design challenge using NX CAD, the design offender and drip area

are learned using different commands. The A-pillar mounting, spill mounting, splash

mounting, bumper mounting is designed.