Attachment Feature Creation - Ribs

AIM :

To create the rib for the Centre Console Coin Holder.

OBJECTIVE :

• To make sure that the model meets the design rules for rib creation.
• To create the Tooling axis using bisecting method.
• To perform Draft analysis on the component.

RIB :

• Rib is a feature which provides stiffness and strength to molded parts.
• They are thin extensions that run perpendicular from a wall or plane.
• They provide these features without increasinbg the overall thickness.
• If the wall is too thick, warping and sinking can result so that the entire design may need to be rejected.

• Taller Ribs provide great support, Rib height might approximately taken as 5 times the base thickness.
• For wall thickness less than 1 mm, rib thickness is same as the wall thickness.
• A Draft of 0.5 degrees per side is the minimum limit.
• Rib thickess can be taken as 0.4 times the base thickness.
• Minimum thickness at the rib tip is 0.75 mm.
• Optimum rib fillet radius can be taken as 0.25 mm which is optional.

PROCEDURE :

Creating Tooling Axis

• Initially a base surface was extracted from the Class A to create a center point.
• An axis system was created upon this point.
• The Intersect feature was used to obtain a boundary of the Class A intersecting at the mid plane.
• Once the check for the discrepencies in the boundary is done, the Tooling axis was created from thr mid-point.

Creating Rib feature

• Ibitiallt the base surface from the plastic component was extracted.
• A sketch for the rib was created on the surface.
• An additional sktech was also created through offset for another rib.
• These sketches were extruded and thickened using Thick Sucface command.
• The necessary drafts and fillets were provided to the ribs.

Draft Analysis

• The Drafting analysis was performed using the Feature Draft Analysis command.
• Using this command the compass was set on the main tooling axis and the Draft angle was changed to 3 degree.

MODEL RESULTS :

Feature tree

Front view

Top view

Side view

Isometric view

CONCLUSION :

• The creation of Tooling axis and Draft analysis were performed.
• The Rib features were created.
• The necessary screenshots and files were attached.