Door Arm Rest Week 8 Challenge

Aim/Objective:

Creation of Door Arm rest and add thickness to it.

Considerations:

Material thickness:2.5mm

Minimum Draft Angle:3 degree

Description:

Class A surface: It is outermost surface of automobile which gives aesthetic look to vehicle. It is physically touchable. It is obtained from clay modeling by reverse engineering. This surface is given input to plastic product designer to work.

Class B surface: This surface is created by taking offset from class A surface. It is surface on which all engineering feature like screw bosses, dog house, ribs & mounting are created.

Class ‘C’ surface: This is surface which joins class A & class B together.

Tooling axis: It is the direction in which core & cavity opens & closes.

Slider Direction: Due to the special requirements of a product, the mold release direction of a particular part may not be consistent with the mold opening direction of the injection molding machine (product undercut), the slider, also known as slide, is a mold mechanism that is developed to solve the issues with the undercut. The basic principle is to turn the vertical movement of mold opening / closing into a horizontal motion. In order to cope with the situation that the undercut is located in the core or cavity,
different structural forms are developed.

Method followed:
1. Checking continuity of class A surface.
2. Deciding feasible tooling direction & creating tooling axis.
3. Performing draft analysis on class A surface.
4. Creating class B surface from given class A surface.
5. Creating class C surface to join A & B class surface.
6. Creating solid feature by using closed surface.
7. Performing draft analysis on final plastic component.

Tooling Axis and Slider axis derived for Class A surface.

Class B Surface

Class C Surface.

Final Trim.

Final Part Body:

Draft Analysis Along Main tooling Axis.

Green Colour- Above 3 degree draft

Blue Colour- 0-2.9 degree draft

Red Colour- Below ) degree

Draft analysis along sliding axis

Feature Tree:

Conclusion: Arm rest plastic component is designed from the given Class A surface and draft anlysis is carried out on final output part.