Week 8 - Challenge 3 - Coin Holder Design

Aim: Create closed body of given Class A surface of Coin holder.

Objective :

• To design coin holder as per automotive OEM Standard.
• Create B Class and C Class and tooling axis.
• Convert close lose the surface into the solid body and provide the thickness of 2.5mm.
• Performing draft analysis to verify the creation of the Tooling axis and C Class surface.

Software :

• CATIA V5 (Generative Shape Design)

Material : Polypropylene has high flexural strength due to its semi-crystalline nature. Polypropylene has a relatively slippery surface. Polypropylene is very resistant to absorbing moisture. Polypropylene has good chemical resistance over a wide range of bases and acids.

Design Methodology with images:

Procedure for creating Tooling Axis

1. Extract the plane surface
2. Take a point on surface of plane.
3. Create a line according to normal to surface.
4. Rename it as Tooling Axis.

Draft Analysis

• Select the Material option and select the surface.
• The given Draft angle is 3 degree,.
• initially place the compass and lock it select the surface.
• But it in catia It worked at 2.9 degree.

Procedure for creating B Class surafce

Side Walls:

• Extract the side walls with no propagation in extract option.
• Untrim them.
• Extrapolate the walls with point continuity of distance 20mm.
• Trim the walls to get the required shape.
• Offset those trimmed walls with thickness value.

Top & Bottom Surfaces:

• Extract the surfaces separately and untrim them.
• Extrapolate the surfaces with required distances.
• Offset them with thickness value.
• Trim them for required shape.
• Measure the fillets, calculate it and create fillets.

Procedure for creating Class C Surface:

• Get the boundary lines of Class A surface separately.
• Smooth the curves with a smooth option as boundary lines have a lot of vertices.Sweep the curves with tooling axis as direction in Sweep option.(Perpendicular)

Procedure for creating Closed Body

• Join the Class A and Class C surfaces.
• Trim those joined surfaces with Class B surfaces.
• Go to Part Design and insert a Body.
• Create a closed surface.

Procedure for creating Draft Analysis:

• Go to the Insert menu and select the Analysis option.
• Select Feature Draft Analysis.
• Select the Material option and select the surface.
• Drag the compass and place on tooling axis.
• Make sure that the top surface is in green colour as draft angle should not exceed 3deg.
• Click on Okay after confirm the model.