Principle of separation of parts in 2 shells

To achieve the separation of part in 2 shells you only have to build up the necessary parting lines.

Once the parting lines have been built up you have to associate the necessary parting surfaces.

It is not necessary for this operation to have in consideration the undercuts and/or future mold movements.

Take as example the following part:

There are various possibilities to build up the parting surface and cavity blocks. Here we are going to examine 2 methods.

External parting surface + internal hole surface

In Blue : Upper shell

In Magenta : Lower shell

In Green : Parting surface

To better visualize the 2 shells system, imagine that the 2 shells (part surfaces) + parting surfaces must "close tight" the upper and lower part (blue zone and magenta zone). Afterwards the hole will be made by an insert.

 External parting surface + internal surface at the part base

In Blue : Upper shell

In Magenta : Lower shell

In Green : Parting surface

This method is not the most appropriate for this example but shows how the system works when considering your parting lines and surfaces.

It will not be necessary in this case to built up a parting line on the hole.

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