ROTARY ROLLER SURFACE CLEANING METHOD AND ROTARY ROLLER SURFACE CLEANING APPARATUS

摘要

A rotary roller surface cleaning method and a rotary roller surface cleaning apparatus which, when foreign matter is detected on a surface of a rotary roller of a quenched ribbon manufacturing apparatus, remove the foreign matter by irradiating the foreign matter with a laser having an output value corresponding to a thickness of the foreign matter. At least one of a rotation speed of the rotary roller and a laser response time is adjusted such that the rotation speed of the rotary roller and the laser response time satisfy a relational expression V×S≦D/1000 (D≧0.1 mm), where the rotation speed of the rotary roller is V (m/sec), the laser response time is S (sec), and a length of the foreign matter along a circumferential direction of the rotary roller is D (mm).

主权项

1. A rotary roller surface cleaning method for a quenched ribbon manufacturing apparatus including: a furnace that contains a molten metal constituted by a rare earth magnet material; and a rotary roller that is supplied with the molten metal from the furnace during rotation and quenches the supplied molten metal to manufacture a quenched ribbon for a rare earth magnet, the method comprising:
emitting a laser onto a surface of the rotary roller; receiving a reflection laser obtained when the laser emitted onto the surface of the rotary roller is reflected; measuring an intensity of the reflection laser; detecting foreign matter on the surface of the rotary roller on the basis of the intensity of the reflection laser; when the foreign matter is detected, controlling an output of an emission laser to be emitted to have an output value corresponding to a thickness of the foreign matter; removing the foreign matter by irradiating the foreign matter with a controlled laser to clean the surface of the rotary roller; and adjusting at least one of a rotation speed of the rotary roller and a laser response time, which is a time required to control the output of the emission laser to have the output value corresponding to the thickness of the foreign matter after receiving the reflection laser, such that the rotation speed of the rotary roller and the laser response time satisfy a relational expression V×S≦D/1000 (D≧0.1 mm), where the rotation speed of the rotary roller is V (m/sec), the laser response time is S (sec), and a length of the foreign matter along a circumferential direction of the rotary roller is D (mm).