Week 8 - Challenge 6 - Core & Cavity Design

Core and Cavity design

Introduction:

The acitivity involves design of core and cavity for Switch bezel component. The Class A, B and C surfaces are used to form Core and Cavity.

Cavity:

Cavity is the fixed half of the injection moulding machine. It consists of runner and gates through which molten plastic is injected into the cavity at high pressure. Cavity side of the component form the Class B surface.

Core:

Core is the movable half of the moulding machine. It moves along the tooling axis. Before molten plastic is injected, it moves into the cavity aided by hydarulic pressure. The same pressure seals core into cavity till the molten plastic is pushed in and cooled down. Then Core disengages with Cavity and the ejector pins within core sub-assembly push the part awasy from core and separate it. Core side of the part is Class-A surface.

Parting Surface:

Injection mould has two major parts: Core and Cavity. These parts are interlocking and form a sealed hollow volume at high pressure where the mould is poured in and thus preventing it to flow out. The surface which the molten plastic touches is the parting surface that seperates the two halves of the moulding machine.

Depiction of Core, cavity and parting surface:

Core in diferent views:

Cavity in different view: