How to get the pos of the intersection point of a tube and a volume

Have you considered using "Pipe Splitting" OOTB functionality ?

You must specify a cutting plane.

In your case you must define two planes, box top and box bottom .

The functionality will add a piping assembly (i.e. a pair of flanges) at splitting points.

Thank you Galluzzi, Do you mean like this, create a virtual PANE in BOX TOP, then select this PANE and BRAN, then create the parts

You can define a splitting plane in the Split Pipe Form directly

NEW FLANGE CHOO ALL CONN POS PA DIST 1000 FROM PL OF PREV

This is the command I found from the forum to add the flange, please ask how can I use the command to add flange in the PANE and PIPE focus POS?