Week 8 - Challenge 6 - Core & Cavity Design
Aim: to create core and cavity for the switch bezel
Creation of core and cavity block:
Parting surface: Parting surface designed for the removal of the plastic products and cold slug, the parting surface in which the core meets the cavity, and usually located at the larger section of the product.
When designing a plastic injection mold, the selection of the parting surface is an important design factor. With a reasonable parting surface selection, the mold structure can be simpler, making it easier to mold and release the plastic product, with product quality guaranteed. If the parting surface is inappropriately selected, mold structure becomes complex, making it difficult to mold the plastic product, thus affecting product quality. Therefore, the selection of the parting surface is of great importance to the design of mold structure.
A, B, C surfaces are extracted and trimmed
This surface is split with a parting line to create an actual parting surface
Parting line: A parting line, in the industrial casting of molds, is the borderline in which draft angles change direction. That is, it is the dividing line that splits the core and cavity halves of a molded part.
CORE DESIGN
Core - Cores are normally designed on the moving half of the mold base. This is the ejection side. On this side of the mold, there is the ejection system of the injection molding machine. This system connects to the ejector system of the mold. The core has the projection.
For creating core a rectangle is extruded which fits the actual part
It is then trimmed with the parting surface with a part area
Finally, its top is filled and joined together
cavity - Cavities are normally designed in the fixed half of the mold base, the injection site. Sometimes, however, cavities may be mounted on the moving side. The cavity has depression. Cavities are normally the "nice side" of the plastic part: well finished, without marks.
The same rectangular sketch is extracted for the cavity
This is trimmed with B surface of a switch bezel
the bottom is filled and joined to for cavity surface
