Week 8 - Challenge 4 - Coin Holder Design

CREATION OF CLASS A, B AND C SURFACES, TOOLING AXIS AND DRAFT ANALYSIS FOR COIN HOLDER

Objective:

The main objective of this project is to create the class A, B and C surfaces, tooling axis and the draft analysis for the Coin holder using Catia V5.

Introduction:

The tooling axis is very important for the component to be manufactured, keeping that tooling axis as reference the part can be manufactured without any congestion and will ease the way in manufacturing the part. The draft analysis will show the important angles of the body, it is very important to maintain positive draft angle. After the plastic part is cooled in the cavity, the part is ejected, while ejecting the part should have the draft angle for easy removal, if there is 0 degree draft the part while removing would get damaged.

Methodology/approach:

• For the creation of tooling axis and draft analysis, the first important input is the class A surface, then further using Catia V5, create the tooling axis and draft analysis, first, check the best direction (X, Y, Z) and select the direction at which the part will easy to remove from the mold. Y direction is selected for the Tooling axis. Create a dummy tooling axis for reference.

• For creating the tooling axis use the Y direction, use the bisecting method for creating the tooling axis, first draw a intersection curve in ZY plane and then use the vertical line and draw a bisecting lines for both of them to get a centre axis line so we can have the centre for the tooling axis.

• Then perform the same in the other XY plane and get the bisecting lines for the tooling axis. Then use both the tooling axis in XY and ZY plane and get the bisecting line for them to produce the main tooling axis.

• Publishing – Use the publish option to publish the Class A surface and the tooling axis, so it is easy for using it for other features.

• Thicken the coin holder using some of the surface features, since the edge fillet has to be at equal distance on the offset surface, we add the thickness to the edge fillet, the final offset will be the B surface.

• The C surface is the surface which give the thickened body surface. This is made using the sweep surface option with the reference as outer surfaces of class A surface.

• Then join and trim them to obtain the thickened part surface.

• Using part design create a solid body from the closed body feature.

• Then, use the feature draft analysis to check the draft analysis of the coin holder using the tooling axis.
• Use the analysis>Feature draft analysis toolbar to check the draft analysis, Use the compass and place in the main tooling axis direction line being upwards and lock it.

• Select the axis and the part so that the color changes according keeping the reference as tooling axis.

• On the quick analysis mode there are 3 colors green, red and blue. We can change the values as per our standards, in this coin holder part the class A surface has most of the sides with 0-degree draft which is very difficult to manufacture, it is recommended for the class A surface to be improved with minimum draft angle at the 0-degree walls.

• Analysis on running point - with the help of this option, the angles at every point can be checked easily. The area with green color can be suitable for the present tooling axis.

The draft analysis is obtained for the closed surface of coin holder.

Different views of the coin holder:

• Front view

• Left side view

• Isometric view

• Top view

Conclusion:

The draft analysis, tooling axis, B surface and C surface are created for the class A surface of the coin holder.