US 11,938,542 B2
Method for finishing a workpiece made by additive manufacturing
Thomas Böckler, Würselen (DE); Matthias Dusil, Dusseldorf (DE); Bernd Hildebrandt, Tönisvorst (DE); Dirk Kampffmeyer, Linnich (DE); and Georg Selders, Weeze-Wemb (DE)
Assigned to Messer SE & Co. KGaA, Bad Soden (DE)
Appl. No. 17/291,137
Filed by Messer SE & Co. KGaA, Bad Soden (DE)
PCT Filed Dec. 10, 2019, PCT No. PCT/EP2019/084460
§ 371(c)(1), (2) Date May 4, 2021,
PCT Pub. No. WO2020/126684, PCT Pub. Date Jun. 25, 2020.
Claims priority of application No. 102018010079.1 (DE), filed on Dec. 20, 2018.
Prior Publication US 2021/0387260 A1, Dec. 16, 2021
Int. Cl. B22F 3/24 (2006.01); B22F 10/64 (2021.01); B33Y 40/20 (2020.01); C21D 1/18 (2006.01); C21D 6/04 (2006.01); C22F 1/00 (2006.01)
CPC B22F 3/24 (2013.01) [B22F 10/64 (2021.01); B33Y 40/20 (2020.01); C21D 1/18 (2013.01); C21D 6/04 (2013.01); C22F 1/002 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A method for after-treating a metallic workpiece produced by means of additive manufacturing, wherein the workpiece is, after it has been manufactured, subjected to a cold treatment in which the workpiece is cooled in a cooling phase to a lower target temperature of below −30° C., held at the lower target temperature during a hold phase, and subsequently warmed in a warming phase to an upper target temperature;
wherein the cooling phase or the hold phase is interrupted by a first intermediate warming phase in which the workpiece is warmed to a first intermediate temperature and subsequently cooled;
wherein the cooling phase or the hold phase is interrupted by a second intermediate warming phase in which the workpiece is warmed to a second intermediate temperature and subsequently cooled, wherein the second intermediate temperature is different than the first intermediate temperature; and
wherein the cooling phase is interrupted by the first intermediate warming phase and the hold phase is interrupted by the second intermediate warming phase.