Week 8 - Challenge 6 - Core & Cavity Design

Create the Core and cavity blocks for the switch bezel designed in the earlier challenge.

Aim:

• To design core and cavity for switch bezel design.

PROCEDURE

• In core and cavity design, there are 4 major elements considered; 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 one is movable.
• During injection moulding, core and cavity is pressed against each other tightly to create hollow space and avoid leaking of material.
• The surface where the two halves are joined is called parting surface. The outline of the component at the parting surface is called parting line.

DRAFT ANALYSIS

• In the draft analysis, component is observed for parting line. The surfaces having positive draft will be cleared in core side. In switch bezel, parting line is observed at B surface side.

PARTING LINE AND PARTING SURFACE

• To get the parting 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 split with the parting line. The resulting surface is parting surface.

These two surfaces are then trimmed to get core shape. Top of the extrude is closed using fill surface operation to get the closed volume.

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

core and cavity are both closed volume is then should be converted into the solid body.

MOULD OPEN POSITION

ISOMETRIC VIEW

TREE STRUCTURE