Week 8 - Challenge 3 - Coin Holder Design

Coin Holder Design & Analysis

Input : Class A Surface

Class B Surface

Class C Surface

Tooling Axis:

For tooling axis creation Class A surface is first investigated and check that there are no gaps between the surfaces. In plastic product design tooling direction is essential as it decides the direction for separation of mould.

For creating tooling axis we will first create a point on middle of surface by using point on surface command then create a intersection for the surface and then create lines aligned to it and then we will use the bisecting method and our main tooling axis will be created.

In Bisection method bisecting line will bisect the two lines if they are perpendicular and will show some error if they are parallel this will decide that whether the surface is toolable or not .

Class A Surface with tooling axis.

Draft Analysis:

Draft is the angle in which the part is tapered to allow it to release from the mold properly and as the part is cooled it has a tendency to shrink towards the core side of the mold due to this we need to add draft angles.Nominal draft angles is usually around 3 degrees and more than 3 degrees can also be manufactured like 5 degrees but it will unecessarily increase the costing of manufacturing and final product.

Procedure used for draft analysis in Catia cad software:

1) In display frame first we need to change it to material mode

2) Click on insert then analysis and select feature draft analysis

3) Then we will click on compass and and align it with tooling direction.

4) Then we will click on the lock symbol and then click on the surface of the part the colour will change

5) Different color codes are identified and there we can apply draft angle which will reflect us minimum draft angle in green color.

6) We can also have running point analysis on different regions of the part body for permissible draft angle.

Draft Analysis Report on Class A surface

Minimum Draft of 3 degrees

Running Point Analysis

On inversing the draft direction color changes to red

Draft Analysis on Final soild body (Coin Holder)

Minimum Draft 3 Degrees

Running Point Analysis on higlighted surface

Tree Structure with part body( Close Surface) and surface geometries:

Different views of the solid body in various orientations :

1) Isometric View:

2) Front view

3) Side View

Left View

Right View

4) Top View

Final plastic component

Publications:

• Class A Surface
• Class B Surface
• Class C Surface
• Tooling Axis