Week 8 - Challenge 6 - Core & Cavity Design

REPORT

Draft Analysis

• Draft allows a part to release from the mold. Draft is required on all parts in the direction of the mold movement in order to allow parts to release or eject from the mold properly.
• Draft is the angle in the part is tapered to allowed it to release. As the part cools it tends to shrink to the core side of the mode. • The given Class-A-Surface is analised for draft angle.
• The Draft Analysis Toolbar in CATIA V5 is used. After importing the Class-A-Surface the View Mode Customization is selected and in the custumization windows, in the shading section Material is selected.
• After that the Draft Analysis Toolbar is selected and in the draft analysis window the Compass is selected and it is repositioned at top side of the Tool Axis.
• Then the surface is selected and the surface colour is shown according to the draft given to it
• For Draft angle above 29 degrees the surface is colored Green, for Draft angle with 0 degrees the surface is colored Red and for draft angle less than o degrees the surface is colored Blue.
• It is observed that for the given Class-A-Surface the observed Color is green, so the draft given to the surface is sufficient and the surface below is shown Blue which is correct.
• After the surfacing and close surfacing, the Final Plastic Part is Analysed and the draft is observed to be above 2.9 degrees which is sufficient.

Draft analysis for the switch bezel plastic component

Core and cavity blocks in various orientations

Tooling Axis

• Tooling axis indicates the direction through which the tooling (molding, core and cavity movement) is done.
• The axis should be created in such a way that all the parts of the body can be created through that axis.
• For the given Class-A-Surface the tooling axis is in the Z direction.
• For finding the tooling axis first create two Dummy Tooling Axis through the base surface in the YZ and XZ planes. Using the two adjecent walls a line is created in the YZ plane. The line created is a bisecting line of the two lines tangent to the adjesent surface.
• For the wall behind the base, a line is created in the XZ plane such that the line falls at an angle of 6 degrees from the line tangent to the wall.
• Now a line is created in the Z direction which passes through the point of intersection between these two lines created earlier.
• This formed line is the required Tooling Axis. Creation of Class-C-Surface is done through this line to form the required plastic body.