Week 8 - Challenge 4 - Coin Holder Design
COIN HOLDER DESIGN
INTRODUCTION
Tooling axis is the direction in which the mould opens or the core cavity opens. By providing tooling axis to the component we can also do the draft analysis of the component. Draft analysis is performed on components where the ejection of materials happen after the material is made inside the tools.
Class B surfaces are the secondary surfaces that you can see sometimes, but are less important.
Class C surface are the surfaces which connects the class A and Class B surfaces.
OBJECTIVE
To create the Coin holder Plastic component through the given Class-A surface. To begin with, the tooling axis for the given Class-A Surface should be created meeting the requirements of the draft angle and at the end perform the Draft analysis on the model.
To also create the class B and class C surface of the component.
METHODOLOGY
Skin data would be provided to us by the styling team to us.
The first step is to check the continuity of the class A surface. This is to ensure that there is no gap between surfaces. If we find any then we should fix that first.
The second step is to find the tooling axis of the component.
Then we can make the component by creating the class B and class C component.
After that we can do the draft analysis of the component.
DESCRIPTION
Class A surface-
Class A surfaces is a term used in most in automotive design to describe a set of freeform surfaces of high efficiency and quality.
Class B surface-
Class B surfaces are the secondary surfaces that you can see sometimes, but are less important.
Class C surface-
Class C surface are the surfaces which connects the class A and Class B surfaces.
Draft analysis-
Draft analysis is performed on components where the ejection of materials happen after the material is made inside the tools.
Tool Axis-
For the tooling axis we first inspect by taking a section and then decide which direction would be better for the tool axis.
Then we create a point at the centre of the base and create an axis system. Then we intersect the surface A with the YZ plane.
With the intersection we get what we observe is that the side walls of the class A surface are parallel with the vertical axis i.e. there is 0° degree angle between them.
But since it’s a class A surface we have to go the same design since we do not have the authority to change the class A surface design. So we have to go with this draft angle inself.
We create a vertical line along the point created and the vertical axis and this will be our main tooling axis.
Draft analysis of Class A -
After creating a tool axis we do the draft analysis. Before drafting we have to make sure that in the view mode it is selected to the materials.
After selecting the feature draft analysis tool we drag the compass from its position to the tool axis. Then lock the compass. After that select anywhere on the component and it will give you the result.
We change the minimum draft for the component to 3°.
We can use the running point option to check the angle of the component.
We can even modify the colour according to our preference.
Class B surface-
Since this is a complex component we separate some surfaces accordingly by giving some colours to the surfaces for our ease and then create the class B surface.
We start creating the class B surface for that we offset all the flat surface to 2.5mm and then we use the untrim tool to untrim the surface and then use the extrapolate tool to extend the surfaces. We do this the for all the separate sections we created and then we trim all the sections together.
Then we use edge fillet to fillet the corners.
Class C surface-
For this model the class C would be parallel to the horizontal plane because of the design of class A and class B.
We first extract the edges from the Class A surface with the help of which we create the path for sweep for class C and the we even extract the adjacent surfaces to use it as a reference plane.
So we select the sweep tool and in that we select with reference surface option and then we change the angle to 90° for it to be horizontal.
For the hole also we go with the same procedure.
After completing the class C surface we trim the class C with the Class B surface.
Then we join the A surface with the rest of the surface. This will make sure that we get a closed surface. We can check it using the boundary tool, if it gives an error that means that the component is closed.
We the go to the part design workbench and use to closed surface tool to create a solid body of the closed surface component. We can also do a draft analysis on that.
Draft analysis of the component -
For the solid component also we will follow the same steps as we did for the class A surface.
CONCLUSION
With this we got to learn about the draft analysis option and how to create the tool axis for the draft analysis and also to create class B and class C surfaces.