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

AIM : To make a model of door handle from given class B , class C surface and perform draft analysis and Creating the rib for the Drill Handle considering the design rules .

Objective :

• To perform draft analysis on class A surface .
• To create class B surface .
• To create class c surface .
• To create a solid body using close surface feature .
• To create draft analysis in final product .
• Creating the rib and screw boss for the Drill Handle considering the design rules

Introduction :

Class A surface :

• It is given as input to plasticdesigner .
• It is a aesthatic surface .

Class B surface :

• It is surface which is used for engineering purpose.

Class C surface :

• It is the surface joining class A and class B .

Methodology :

• Creating tooling axis.
• Draft analysis.
• class B surface .
• class C surface.
• MAking solid from it using close surface feature.
• Creating the rib for the Drill Handle considering the design rules

Tooling axis :

• First ensure that the class A surface is join.
• As it has 2 hole in Z direction , so Z direction is most suitble for tooling direction .
• First we create dummy tooling direction.
• Now intersecting ZY plane and creating line by bisceting command .

Given Class A surface :

Tooling Axis :

• tooling axis is created by extracting the surface and untriming it and and creating point at the centre.

Draft analysis :

• Change the view mode to custamize view parameter and select material .
• Align the compass with the tooling direction.
• now click on the surface .
• Surface colour is green which mean that it has minimum 3 degree draft angle , which is sufficient in plastic component manufacturing .
• here we have given 0.5 degree draft angle to pass draft analysis test .

class B surface :

• class B surface is created by offseting class A surface by 2.5 mm which is thikness of the body.
• it has patches which is repair using fill command .

Creating class C surface :

• it is created by using sweep comand.

Creating solid :

• Now use close surface command to create solid from it.

Creation of engineering feature :

rib :

• Rib provides an economical way to increase stiffness and strength to the mould parts without increasing overall thickness of the wall .
• it is the thin portrusion perpendicular to the wall .

ss of rib :

RIb root thickness analysis :

• To check the root rib thickness , first take perpendicular intersection across the body and the rib and then draw tritangent circle to root area .
• the value must be within 30 % greater of the wall thickness.

Screw boss :

• they are used as a point for attachment and assembly in as cylindrical projection with hole design to receive screw screw or other types of fastening hardware .

Design consideration of screw boss :

screen short of screw boss :

Draft analysis of final solid body :

Tree structure view :

Publications :

Different views :

Isometric view :

front view :

side view :

top virew :

Conclusion :

• Created class B and class C surface .
• Created a solid body .
• Perform draft analysis .
• created engineering features rib and screw boss .