Week 8 - Challenge 6 - Core & Cavity Design

Core and Cavity Design for a switch bezel

Aim :

To create the core and cavity blocks for the switch bezel we have already designed it as the solid part.

Objective :

• Create the required Tooling axis by using the bisecting method.
• Perform the Draft analysis on the solid model.
• Create the parting line and parting surface.
• And create the core and cavity blocks for the switch bezel.

Creation of tooling axis

Tooling direction is important for plastic product design as it decides the direction for mold separation.

The first step is to observe the given class-A surface deeply and we can say the larger flat area which is perpendicular to the Tooling axis. so by cosidering, this things for this class-A surface tooling direction is near to the Z-axis.

The next step is to create the reference axis from X-axis and Y-axis. so for that, we take the two sides flat surface as the reference and create lines along the faces in the Y-direction by using the intersecting line and by using the bisect line tool the reference axis from Y-direction is created.

By bisecting this two dummy tooling axis we can have the main tololing axis.

Drafting the class A

After creating the tooling axis draft analysis is done for the class A. To ensure the feasibility of tooling axis.

Insert featured draft analysis option fron insert menu. Click on the compass in the direction section. Try to place the compass in the direction of tooling axis, click on the component.The green colour area shows the surface clearing the draft analysis, red indicates the zero draft angle, where blue indicates the negative draft angle along the tooling axis.

After combining class A, B and C do the same draft analysis for the component.

Core and cavity :

A core is the one part of the mold and it is responsible for half of the molded part. Core is the projection of the body and cavity is the depression of the body. These core and cavity combine to form a mold. Then the plastic material is injected into this mold to get a plastic part.

Parting surface :

Generally, injection mold has two major components the movable halve and the fixed halve, during the injection molding process, these two halves are pressed tightly and form a sealed hollow to avoid the melt flow leakage and maintain certain holding pressure, the pressed surface is called parting surface, usually parting surface are the biggest projection outline of the part.

Parting line :

It is the area in which the parting surface and component meets or it is a junction between core and cavity.

Creating parting surface

Parting surface is created by trimming the A and C join with B

Creation of parting line

Parting line is crated by intersecting the AC join with the B.

Diffrent views

Conclusion

Core and cavity design has been done for the switch bezel by maintaining proper tree structures.