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

AIM: -

TO CREATE THE RIB FOR THE DRILL HANDLE CONSIDERING DESIGN RULE.

Rib & Screw Boss are the Engineering Features which is on "B surface”, They have some Design Rules to avoid Plastic defects.

1)RIBS: - Ribs are usually designed to Improve Strength of Plastic Part without increasing the thickness of the component.

2)Screw Boss: - It helps to screw component together. Screws are secondary features which is on B surface. Bosses are used to attached & assembly features of many components.

DRAFT ANALYSIS: - Draft analysis is required to check if a part has required draft or not. The Draft analysis refers to a Tool that allows us to determine if we can remove the part, we are designing from the tool being used to design it.

TOOLING AXIS: -

The Tooling Direction is basically the direction that the mold pulls apart. The mold is built in two separate pieces. Basically, we have a Cavity & Core side. The Core pulls apart from the Cavity.

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 the most easily ejectable direction is somewhere close to the Z direction,(might be inclined to it) so we have made a sketch on the YZ plane of Axis System) to create a bisecting line considering the 2 faces which might be difficult to be tooled.

Creation Of Class B surface:

Creation Of Class C surface:

CLOSED SURFACE:-

Creation of Door Handle:-

B SIDE FEATURES CREATION

RIB 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

• 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

  
• Sketch Used For Rib Creation
• 
• SCREW BOSS DESIGN
• 
• Sketch Used For Screw Boss Creation

Draft Analysis:

Draft analysis of Class A surafce:

Draft Analysis of Door Handle:

Tree Structure:

ISOMETRIC VIEW

TOP VIEW

SIDE VIEW

CONCLUSION:

• The Tooling axis and the SolidCAT part with B Side Features is created from the given Class A Surface and Draft Analysis is Performed.