Week 9 - Attachment Feature Creation (Ribs & Screw Boss) - Challenge 1

OBJECTIVES :

Creating a RIB and Screw boss in the door handle in followed the design rules

TOOLING AXIS :

Tooling Axis creation:

It is defined as the direction in which the mould/core and cavity open. Selection of the direction of the tooling axis depends on the ease at which components can be easily ejected by analysing the component z direction is easily ejectable so to take a yz plane to create a intersection line and create the bisecting in both lines to we get tooling axis

DRAFT ANALYSIS :

CLASS B SURFACE :

CLASS C SURFACE :

DRAFT ANALYSIS :

RIBS CREATION :

Design Principle for Rib Creation

• Ribs are thin wall protrusions that extend perpendicularly from a wall or plane. They are usually found in clusters offering support to a plane that would have otherwise been too thick, but can also be stand-alone support for a single wall. They are commonly used to provide additional support and strength to a part. Thickness and location are essential to rib design.

  First, the base surface where the rib has to be created is extracted using the Extract command. A positioned sketch is created and the profile for the rib is drawn.

• Next, the profile is extruded, to find the height,h=Wall thickness * 5

  =2.5*5

  = 12.5 mm

  Therefore, the height is 12.5 mm

• The extruded surface is thickened,

  Thickness,w=0.4*t

  =0.4 2.5

  =1mm

  Therefore, the thickness of the rib is 1 mm

RIBS :

SCREW BOSS CREATION :

• Used in many part designs as points for attachments and assembly
• the most common variety is of cylindrical projections with holes designed to receive screws fastening hardware
• Bosses that merge into sidewalls should be avoided

DESIGN RULES :

• Draft - 0.5 degrees on walls of boss
• Thickness - Typically 40%* of the nominal wall at the base.
• Height to Diameter Ratio - 3:1
• Radii - 0.25mm maximum radii.

SCREW BOSS :

GEOMENTRICAL TREE :

FINAL DRAFT ANALYSIS :

CONCLUSION:

TO CREATED THE CLASS B and C surface and created the RIBS and SCREW BOSS to following the design rules