US 12,076,782 B2
Manufacturing of a three-dimensional workpiece from a liquid material
Benjamin Schweizer, Horb (DE); Eberhard Maier, Koengen (DE); Peter Voehringer, Kornwestheim (DE); and Roland Bleher, Benningen (DE)
Assigned to Robert Bosch GmbH, Stuttgart (DE)
Appl. No. 17/281,655
Filed by Robert Bosch GmbH, Stuttgart (DE)
PCT Filed Sep. 27, 2019, PCT No. PCT/EP2019/076205
§ 371(c)(1), (2) Date Mar. 31, 2021,
PCT Pub. No. WO2020/070002, PCT Pub. Date Apr. 9, 2020.
Claims priority of application No. 10 2018 216 930.6 (DE), filed on Oct. 2, 2018.
Prior Publication US 2021/0387253 A1, Dec. 16, 2021
Int. Cl. B22D 23/00 (2006.01); B05B 1/08 (2006.01); B22F 10/22 (2021.01); B33Y 10/00 (2015.01); B33Y 30/00 (2015.01); B22F 12/53 (2021.01)
CPC B22D 23/003 (2013.01) [B05B 1/083 (2013.01); B22F 10/22 (2021.01); B33Y 10/00 (2014.12); B33Y 30/00 (2014.12); B22F 12/53 (2021.01)] 16 Claims
OG exemplary drawing
 
1. A method for the additive manufacturing of a three-dimensional workpiece from a liquid material (1), the method comprising
feeding the liquid material (1) to a displacement chamber (2),
in an initialization process prior to a start of an actual printing operation, vibrating a piston (3) to couple ultrasonic soundwaves into the liquid material (1) to optimize wetting properties of at least one surface (5, 6) delimiting the displacement chamber (2) and/or a spray hole (4),
after the initialization process, discharging the liquid material in droplet form via the spray hole (4) during the actual printing operation by a pressure pulse, which is created by moving the piston back and forth.