Week 8 - Challenge 5 - Core & Cavity Design

OBJECTIVE :

To design the core and cavity for switch bezel and to design the parting surface and parting line for switch bezel.

In core and cavity design there are four main things to consider core, cavity, parting surface and parting line. Core and cavity are the two halves of complete mould in which either of them is fixed and other is movable. Core and cavity are pressed against each other tightly to create hollow space and avoid leaking of material. The surface where two halves are joins is called parting surface. The outline of the component at the parting surface is called parting line.

In the draft analysis, we can see that the surface having positive draft will be cleared in core side.

For trimming line, trim having class A and C surface is intersected with class B surface. The intersection boundary is called the parting line, then the B surface is with the parting line. The resulting surface is parting surface.

For core design, class A surface trimmed with class C surface is taken. The required trim is taken from component design constructions.

Then it is trimmed with B surface considering outside of B surface as parting area.

A sketch of rectangle is drawn in top view and it is extruded along the tooling direction.

These two surfaces are trimmed together to get core shape. After that we fill the top of the extrude to get the closed surface and then we create the solid body.

For cavity design, B surface is trimmed with the rectangular extrude. The bottom open part is closed to get closed volume and then converted to solid body.