Use of External Cores

The cores are well known to be used for generating internal cavities or hollowness at the cast components. However, some typical external features are required to be obtained using external cores rather than mould surfaces. It is because that these mould zones are impossible to be released from pattern without creating any destruction.

 

01 Use of external cores

It can be seen at the illustrative figure that the projections on the vertical wall are problematic from moulding point of view. But if the problematic zone is substituted by an external core, the difficulty seems to get overcome. For introduction and fitment of the external core the concerned pattern is required to have an additional core print. This core print shall create the required space in the mould for placing the external core. Even with this extra core print, now the moulding is possible. Such arrangement can be at the drag mould or the mould depending upon the requirements.

02 Use of  external cores