What is the process called that changes the shape of the entry side of a hole to remove burrs and sharp edges?

The process that changes the shape of the entry side of a hole to remove burrs and sharp edges is referred to as edge breaking. This technique specifically involves smoothing out the edges and corners of a hole or part to enhance safety and improve the fit of mating components. Edge breaking is critical in aerospace applications, where metal components must fit together precisely, and any sharp edges could lead to injury during assembly or operational failure due to stress concentration.

The options that involve deburring or chamfering can often cause confusion. Deburring typically deals with removing imperfections from surfaces that may not necessarily have sharp angles, while chamfering specifically refers to creating a beveled edge at the intersection of two surfaces. Polishing is primarily about achieving a smooth and shiny surface finish, rather than specifically addressing sharp edges or burrs.

Understanding these distinctions in manufacturing processes is essential for maintaining quality and safety standards in aerospace assembly and mechanics.