US 11,938,568 B2
Method for processing superfine blade edge using femtosecond laser
Sung Hwan Kim, Suwon-si (KR)
Assigned to 21 TH CENTURY CO., LTD, Hwaseong-si (KR)
Appl. No. 16/972,484
Filed by 21TH CENTURY CO., LTD, Hwaseong-si (KR)
PCT Filed May 22, 2019, PCT No. PCT/KR2019/006105
§ 371(c)(1), (2) Date Dec. 4, 2020,
PCT Pub. No. WO2020/111411, PCT Pub. Date Jun. 4, 2020.
Claims priority of application No. 10-2018-0148258 (KR), filed on Nov. 27, 2018.
Prior Publication US 2021/0268606 A1, Sep. 2, 2021
Int. Cl. B23K 26/352 (2014.01); B23K 26/03 (2006.01); B23K 26/042 (2014.01); B23K 26/06 (2014.01); B23K 26/0622 (2014.01); B23K 26/073 (2006.01); B23K 101/20 (2006.01)
CPC B23K 26/3576 (2018.08) [B23K 26/032 (2013.01); B23K 26/042 (2015.10); B23K 26/0624 (2015.10); B23K 26/0648 (2013.01); B23K 26/0732 (2013.01); B23K 26/0665 (2013.01); B23K 2101/20 (2018.08)] 6 Claims
OG exemplary drawing
 
1. A method of processing a superfine blade edge using a femtosecond laser, the method comprising:
primarily grinding a blade edge portion by using a grinding wheel, a blade edge being primarily ground in a direction vertical to a rotational direction of the grinding wheel; and
secondarily grinding at least a part of the blade edge portion by emitting a femtosecond laser to the ground blade edge portion in a lengthwise direction,
wherein the secondarily grinding comprises: oscillating the femtosecond laser; increasing a size of energy distribution of the femtosecond laser; modifying the energy distribution of the femtosecond laser; aligning a central portion of the energy distribution of the femtosecond laser to an end portion of the blade edge portion; changing an advancing direction of the femtosecond laser and emitting the femtosecond laser to the blade edge portion via a movable objective lens; and emitting the femtosecond laser while moving, in a lengthwise direction of the blade, a stage on which the blade is placed, and
wherein the blade edge portion has a first inclined surface and a second inclined surface, the second inclined surface is formed through the primarily grinding, the first inclined surface is formed through the secondarily grinding, and the first inclined surface is formed in such a manner as to have a gentler slope than that of the second inclined surface.