Week 8 - Challenge 6 - Core & Cavity Design

AIM: To create the core and cavity for the switch bezel condering the all design rules.

TOOLING AXIS:

Given Class A surface of switch Bezel:

Procedure for creating Tooling Axis

1. Intitally Creat a point on the Plane Surface.
2. The Given Class A is Fully tilted because of that create axis along Normal to surface.
3. Create a line along the point in normal to surface with surface as the point is Placed.
4. And give the top and bottom lemght to the line.

Draft Analysis of class A surface:

• First need to join the Given class A surface
• In draft analysis drag the compas on the tooling axis and select the surface of class A for draft
• The given draft angle is 3 degree.

• .

Core and cavity design:
The Mould Core & Cavity are the shaped sections in either half of the mould tool which give the plastic product its final shape.

The hot molten material is injected into the core & cavity and then sets hard into shape. The design of the core & cavity is essential in the correct formation of the product. The sequence of events during the injection mould of a plastic part is called the injection molding cycle.

The cycle begins when the mould closes, followed by the injection of the polymer into the mould cavity.

A core is usually made of the best quality sand and is placed into the desired position in the mould cavity. Core prints are added to both sides of the pattern to create impressions that allow the core to be supported and held at both ends.

Core :

• The core design is started with extracting the parting surface that becomes the datum for the core and cavity. The parting surface in most of the cases is kept at the B class surface to avoid close and tight contact between the core and cavity.
• At first, the A-class surface is extrapolated with some length and later it is trimmed with a C surface

Cavity :

• The cavity is the part where the injector and filling of the molten plastic happens. The cavity block is prepared by first extruding the outer boundary along the tooling direction.

• This outer surface is trimmed with the B class surface and then it is filled and thickened.

Parting line and Parting surface :

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. It is sometimes a starting point for the mold parting surface.

Here intersecting the parting surface, core, and cavity across the ZX plane gives the intersecting line that tells the parting line.

Parting surface:

The parting surface of a mould are those surfaces of both mould plates adjacent to the impressions which butt together to form a seal and prevent the loss of plastic material from the impression. The parting surfaces of a mould are those portion of both
mould plates, adjacent to the impressions, which butt together to form a seal and prevent the loss of plastic material from the impression.

Draft analysis of core cavity:

core:

Cavaity:

conclusion : The part will be manufcatured by This core & cavity.