Plug for closing holes in pieces during deep drilling

摘要

The invention concerns a plug for closing holes in pieces during deep-drilling or threading mechanical operations in the presence of a liquid under pressure, such as cutting fluid. It comprises a metal body (11) in the shape of a cylindrical sleeve having along a part of its length a series of flexible fins (16) that expand radially starting from a contracted position, and an expansion stem (12) passing through and translating axially in the body and featuring a conical head (20) that engages and expands said flexible fins when the plug is fitted and has to be blocked in a respective hole.