Challenge

Week 8 - Challenge 4 - Coin Holder Design

GGokul Shyam25 Jun 2021

Center console Coin Holder

A class - A surface has been provided to me for designing a full solid body out of a surface and Validate it.

In this given surface first I need to check any open boundaries that may create errors while designing.

After checking I need to create a Tooling Axis for the Class - 'A' surface.
Then I need to create the Class - 'B' and Class- 'C' surface with the help of the Class - 'A' surface

Tooling axis creation

The tooling axis is the direction of drawing a sheet metal where the finished component is easily ejected on a particular direction and axis. The tooling axis is important for removing the material when finished.

First, I will create An Axis system, from that axis system I will get two cross-sections. by using that cross-section lines I will create the tooling axis for the surface.

Taken Cross-section along ZY plane

Clearing toling Axis along Y direction

Now creating a Cross-section along the ZX plane

Clearing tooling axis along the X direction

then using both tooling axis I can now create the main tooling axis for the class - A surface by the bisecting method.

Main tooling Axis

After the creation of tooling Axis, I will now perform the draft analysis for the provided class - A surface.

From the created tooling axis, if I see the model from the top, then it has no negative draft.

but if I examine the model briefly it has some negative draft.

after the errors now I may create a secondary tooling axis ( side core tooling Axis), but for that also there should be a minimum of 3-degree draft angle on all the negative sides of this model.

So when I briefly examined the model I observed that the sides have 0 or negative degrees from the tooling axis.

As we can see, these blue surfaces are almost or equal to 0 degrees.

Now, this is an issue because it will not compete with the recommended classifications of a plastic part manufacturer.
If the surfaces are at 0 degrees the plastic part won't eject at the end due to contraction after the cooling process.

To tackle this problem there are mainly two reasons which I have come to know.

one way is to create a secondary and tertiary side core tooling axis to overcome this problem, but the overall point is to manufacture the product with fewer expenses.
So what I would recommend to the Class - A surface creator to give some draft angles on these sides for 3 to 7 degrees draft to negative sides.

Now keeping the draft issues aside, I Will now Create the Class - B and Class - C surface.

Creation of class - B surface.