Why perform fillet treatment on neodymium iron boron magnets?

Why do NdFeB magnets need corner rounding (chamfering)?

Before shipment, all magnets require corner rounding / chamfering treatment. This process grinds sharp right-angle edges into smooth arcs and polishes the surface of unplated, unmagnetized blank magnets. It greatly improves coating adhesion and delivers a smoother electroplated finish.

What machine is used for magnet rounding, and how long does the process take?

Cut blank magnets are loaded into a chamfering machine for rounding, which normally takes nearly half a day to finish.

What will happen if we skip corner rounding?

Without chamfering, the sharp corners are prone to chipping and cracking. It also ruins electroplating quality: the plating layer peels off easily at edges, eventually leading to magnet oxidation and rust.