Week 8 - Challenge 6 - Core & Cavity Design

Aim : To create a Core & Cavity block for Switch Bezel.

Steps for Creating Core & Cavity

• Tooling Axis
• Draft analysis for tooling Axis
• Parting Surface
• Core Side
• Cavity

Tooling Axis : Tooling Axis is the Direction/axis in which core cavity opens after injection moulding process. Steps involved in tooling axis.

1. Base of the component is extracted and a point is created at the center of the extreacted surface.
2. Tooling Axis is Created by bysecting method. two lines on the opposite surfaces and a bysecting line is created from these two line.
3. same process is caried for the other side of the walls.
4. now between these two temporary tooling axises a by-secting line is created as main tooling axis.

Draft Analysis for Class A surface : Draft analysis enables to detect the part we drafted willl be easily removed. this type of analysis performed on the base of color ranges identifying the zones on the analyses element where the deviation from the draft direction at any points, corresponds to specified values.

Parting Surface : Parting surface is the surface where two halves of the mold meet or it is the surface where core and cavity surfaces are pressed together, so that there is no leackage of molten plastic.

Parting surface should be kept as simple as possible because it will improve overall production.

Creation of parting surface

1. Extract the boundry lines of A surface.
2. Extrapolate Class A (15mm)
3. Trim Extrapolated with Class C surface
4. Now trim above extrapolate with Class B surface

Core : The core design is started with extracting the parting surface that becomes the datum for the core & cavity. Extract the A surface And C surface trim with Extrapolated B surface.

The achieved Surface is converted to enclosed rectangular box by extruding rectangular profile at a distance from the parting line along tooling direction. hence it is closed & joined to form closed surface which is converted into solid body.

Cavity : Cavity is the part where the Injector & filling of thr molten plastic happens. the cavity block is prepared by trimming extrapolated B surface and same profile used in core for rectangular block to extrude along the tooling direction.

The achieved surface is filled and joined to create closed surface.

Parting Lines

Core & Cavity