US 12,434,349 B2
Surface treatment method
Fumiaki Kumeno, Nagoya (JP); and Hayato Taniguchi, Nagoya (JP)
Assigned to SINTOKOGIO, LTD., Nagoya (JP)
Filed by SINTOKOGIO, LTD., Nagoya (JP)
Filed on Jul. 8, 2021, as Appl. No. 17/370,368.
Claims priority of application No. 2020-119888 (JP), filed on Jul. 13, 2020.
Prior Publication US 2022/0009054 A1, Jan. 13, 2022
Int. Cl. B24C 1/00 (2006.01); B23K 26/352 (2014.01)
CPC B24C 1/003 (2013.01) [B23K 26/352 (2015.10)] 14 Claims
OG exemplary drawing
 
1. A surface treatment method comprising:
a step of irradiating a workpiece with a pulsed laser beam through a transparent liquid; and
a step of causing particles each having a core made of an elastic body and abrasive grains provided on a surface of the core to collide with a heat-affected layer developed on a surface layer portion of the workpiece in the step of irradiation, wherein
the step of causing collision includes:
causing the particles to collide with a surface of the workpiece from an oblique direction to grow a microcrack in a direction along the surface of the workpiece; and
causing the particles to collide with the microcrack of the heat-affected layer to remove the heat-affected layer using the microcrack as a starting point.