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

AIM: To Create the rib for the Drill Handle considering the design rules.

Take the Thickness of the component to be 2.5 mm

PROCEDURE FOR DESIGNING THE CLOSED DOOR HANDLE COMPONENT :

Class A surface: Class A surface is a Styling surface or aesthetic surface get it from the styling team. we will design the plastic component by using the Class A surface as input.

• Check all the views of the given class A surface that can help us to understand and get more understanding of the component.
• Connectivity of the class A surface that there is no gap between the component, by using joining command or boundary command we can check.

CREATING THE CLASS B SURFACE

Class B surface is to be creating the engineering features and offsetting the surface of class A. Firstly we will extract surfaces by using the extract command and from the class A surface. And if there are any patches we have to make it a smooth surface and finally get the complete boundary

CREATING THE CLASS C SURFACE

• Class C surface is connected the Class A and Class B, For the class C surface, we need to create the entire boundary of the component by using the boundary command.
• And also creating the best way for the tooling direction to manufacturing easily in an effective way.
• By using the sweep command we can combine them and trim the surfaces so we can get the completed closed surface body and draft angle given as min 3 degrees.
• Before trimming the most important things join them all.
• After the body has to be closed by using the closed surface in part modeling.

TOOLING DIRECTION & BISECTING

The tooling direction would be at the axis at that direction it is very easy to manufacture and all the and all faces and the entire surface are to be covered in that direction without adding any other equipment
Bisecting, the articular surface is a tool or not we intersect the surface with the respective plane and get a sketch which consists of two lines, and with the help of bisecting line option, we bisect the line which creates a line at the midpoint of the two lines. Likewise, we create a tooling clearing axis for x and y which will be used to create the main tooling axis using the bisecting line option in the line command.

VARIOUS ORIENTATIONS OF THE FINAL COMPONENT

DRAFT ANALYSIS

Draft Analysis for the Final Plastic body:

DESIGNING OF THE RIB

RIB is an engineering feature mostly used to provide stiffness and strength in molded parts without increasing the wall thickness

There are many design factors considered to design a RIB:

• Rib draft angle is to be 0.5 degrees( minimum per side)
• Rib thickness at the tip is to be greater than the 0.75
• Rib thickness - 0.4 x t (Thickness)
• Rib fillet Radius 0.25mm (max)
• Height of RIb = 5 x t
• Spacing Rib = 2 x t

DESIGNING OF THE SCREW BOSS

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

Final Rib and Screw Boss component:

CONCLUSION: Finally the DOOR HANDLE component has been created through the given Class-A surface, with the Rib and Screw Boss following the design rules, with the tooling axis for the given Class-A Surface created meeting the requirements of the draft angle and at the end performing the Draft analysis on the model.