Week 9 - Attachment Feature Creation - Challenge 1

AIM : To create Ribs Design of a Centre Console Coin Holder :-

Given Centre Console Coin Holder

RIBs

Ribs are thin wall structure which is provided for extra Stiffness & Strength in the mould without increasing the overall wall thickness of the component.

• Ribs Design - always in B-surface
• Located and arresting component of an assembly
• providing allignment in mating parts.
• Acting as Stop or Guides for mechanism.

Guidelines for RIBs design :-

• Ribs Draft Angle = 0.5 degree per side (minimum)
• Ribs Thickness = 0.4*t (where t=thickness of material) Minimum Thickness = 0.75mm (Top edge)
• Ribs Height = < 5t
• Fillet Radius = 0.25mm (maximum)

{ Eg- if Thickness of a surface (t) = 2.5mm

then Ribs thickness = 0.4*t = 0.4*2.5 = 1mm

Ribs Height = 5t = 5*2.5 = 12.5mm }

Proper Ribs Design involves :-

• Thickness
• Height
• Location
• Quantity / No. of Ribs
• Manufacturability

Procedure:-

• Extract the surface to create the Ribs.
• use Positional sketch to create a line.

• Extrude the line accordiing to the Ribs Designing rule.ie, Thickness =1 mm and height = 12.5mm

• Make the solid profile by using Part Design - Thick surface

• now, apply the Draft angle =0.5degree on all side face of solid profile.

• Measure the Top edge = 0.75mm or more than this

• Apply Fillet radius = 0.25mm

• Assemble this solid body in main part ie; coin Holder body

(Ribs Root Thickness)

• use Intersect the body in XY-plane

• use Tritangent Circle - element= create extract

• for proper circle; use Tools - Option - decrease 3D proportionaly limit 0.01mm

(We got proper Rib which follows our designing rule)

Creating another Ribs

Two Ribs are having certain distance gap between each other.

Eg-

if Height = 12.5mm

Y/X = 3 mm

so, X = Y/3 = 12.5/3 = 4.16 ie; (5mm acceptable)

so, Offset Distance between Two Ribs = 5mm

Repeat the above steps to get Second Ribs -

• Offset (5mm) - Extrude - Insert body - Thick Solid surface - Draft - Fillet angle

• Check Intersection again for spacing/gap

Draft Analysis

The axis along which Core-Covity; Opening/Closing takes place.

• Draft analysis of the coin solid body along tooling axis
• Draft angle = 3degree

• For clearing surface of Ribs, create a dummy axis on ribs along X-direction.

Different View

Front view

Left view/Right View

Top View

Isometric view