Week 9 - Attachment Feature Creation - Challenge 1

RIBS FOR THE CENTRE CONSOLE COIN HOLDER

Tooling Axis: It is the axis along which the core or cavity moves.

Class-A: It is a term used specifically in automotive design. It describes the final production surface data for the aesthetic parts of the car.

Class-B: Class B surfaces are the secondary surfaces that you can see sometimes, but are less important, such as the inside of your glovebox, ash tray, etc.. These must be smooth and "error-free" as well, but are not held to the standards that class A surfaces are.

Class-C: The Class C finish allows more imperfections than Class A or B. Class C is often specified for interior surfaces not readily visible, surfaces that will be covered by another part when assembled, or surfaces which the Customer feels do not need to meet a high cosmetic finish.

PROCEDURE:

TOOLING AXIS:

• After analysing the component, the component features seems to be clearing the tooling in Z-axis(perpendicular to base).
• Usually, a perpendicular axis to large flat surface or hole is considered as a tooling axis.
• Extract base, Create a line with point and direction perpendicular to the base.

RIB DESIGN:

• Create a position sketch, create geometry of rib, isoconstrain it.

• Extrude the line for 12.5mm, as hight of the rib must be <= 5*wall thickness.
• So hight of rib, 2.5*5 => 12.5mm
• Switch to Part workbench and give thickness of 1mm, as thickness of rib must be 40% of wall thickness.
• So Rib thickness = 2.5*0.4 => 1mm

• Give draft of 0.5 degrees. Rib draft must >=0.5 degrees.

• Give fillet of 0.25mm. Maximum fillet radius must be 0.25mm.
• Then translate this rib. The spacing guideline is such that the Hight/Width ratio should be maximum of 3:1, 2:1 is preferred.
• So following 2:1, we get 12.5/2 = 6.25mm.

• Assemble the ribs to the main part.
• Final component, Coin holder with ribs.

• Draft Analysis of the coin holder with ribs attached.
• In below figure we can see the 0.5 degree draft on the rib face.
• The green surfaces are having draft angle of more than 3 degrees and they can clear the tooling direction.
• The red surfaces are having draft angle more than 0 degrees and less than 3 degrees.
• The blue surfaces are having negative draft angle. As the Class A surface is not manufacturable, the same problem can be seen in the solid part. The Class A surface has to be modified and the walls should have some positive draft angle.

• In below figure we can see the measurements of the ribs satisfying the design rules.

ORIENTATION VIEWS:

TREE STRUCTURE: