Week 8 - Challenge 6 - Core & Cavity Design

Tooling axis :

To create the tooling axis, we need the proper orientation or view that gives the correct features and draft available in the component. So here the component view from the Z direction gives the proper view for the tool to see the features present in the geometry. To create the tooling axis from the Z direction we need the tooling axis from the other X direction since it gives the draft available at the slanted part. The tooling axis is created from the X direction by following the steps The base surface is extracted. Then the center point is created using the point > on the surface at 0 At the point created the axis system is created After that switching the view of the model is to the X direction and creating the tooling axis. Using the intersect in the ZY plane to get the boundary lines. Then the lines are created along the slant surfaces. Then these two lines are bisected to get the tooling axis for the X or the final Next, switching in the Y direction and intersecting the switch bezel part in ZX the direction to get the intersecting lines. Using the axis center point, a line is drawn in sketch mode and it is constrained at an angle of 4 degrees. (this angle value is an arbitrary value and can be changed to get the final tooling axis that provides a positive draft )At last, both the lines are bisected to get the final tooling axis.

Core and cavity design:
The Mould Core & Cavity are the shaped sections in either half of the mold 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 mold of a plastic part is called the injection molding cycle.

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

A core is usually made of the best quality sand and is placed into the desired position in the mold 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 by extracting the parting surface that becomes the datum for the core and cavity. In most cases, the parting surface 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 This A and C surface is again trimmed with the B surface to form the core face. Now, the final core block is made by drawing the boundary sketch and extruding it along the tooling axis direction followed by the filling and thickening.

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 borderline in which draft angles change direction. That is, the dividing line 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 mold is those surfaces of both mold 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 mold are those portions of both
mold plates, adjacent to the impressions, which butt together to form a seal and prevent the loss of plastic material from the impression.