US 12,257,625 B2
Method and device for rapid three-dimensional workpiece from a molten 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. 17/600,260
Filed by Robert Bosch GmbH, Stuttgart (DE)
PCT Filed Feb. 7, 2020, PCT No. PCT/EP2020/053103
§ 371(c)(1), (2) Date Sep. 30, 2021,
PCT Pub. No. WO2020/200552, PCT Pub. Date Oct. 8, 2020.
Claims priority of application No. 10 2019 204 566.9 (DE), filed on Apr. 1, 2019.
Prior Publication US 2022/0176451 A1, Jun. 9, 2022
Int. Cl. B22F 10/22 (2021.01); B22D 23/00 (2006.01); B22F 12/53 (2021.01); B33Y 10/00 (2015.01); B33Y 30/00 (2015.01); B22F 12/57 (2021.01)
CPC B22F 10/22 (2021.01) [B22D 23/003 (2013.01); B22F 12/53 (2021.01); B33Y 10/00 (2014.12); B33Y 30/00 (2014.12); B22F 12/57 (2021.01); B22F 2202/01 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for the generative manufacture of a three-dimensional workpiece from a molten material (1), wherein the molten material (1) is fed to a compression chamber (2) and discharged in drop form via a spray hole (4) by a pressure pulse generated by a reciprocating piston (3) that delimits the compression chamber (2), the method comprising
degassing the compression chamber (2) before manufacturing begins and/or during a pause in manufacture, wherein,
in a first step, ultrasonic waves are continuously applied into the molten material (1) present in the compression chamber (2), which generate a force (FBjrk) that makes gas in the molten material (1) sink, and,
in a second step, after ultrasonic excitation has ended, the piston (3) is moved deeper into the compression chamber (2) in order to discharge the gas, which is then rising, via a guide (5) for the piston (3).