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1. (WO2018197888) POWDER BED FUSION APPARATUS AND METHODS

Pub. No.:    WO/2018/197888    International Application No.:    PCT/GB2018/051109
Publication Date: Fri Nov 02 00:59:59 CET 2018 International Filing Date: Sat Apr 28 01:59:59 CEST 2018
IPC: B22F 3/105
B33Y 30/00
Applicants: RENISHAW PLC
Inventors: MEINERS, Wilhlem
EIBL, Florian
KEMAKOLAM, Nneji
SUTCLIFFE, Christopher, John
DERRER, Jan-Peter
HUESKEN, Carlo
Title: POWDER BED FUSION APPARATUS AND METHODS
Abstract:
This invention concerns a powder bed fusion apparatus in which an object is built in a layer-by-layer manner. The apparatus comprises a build sleeve (290, 690, 790, 890, 990, 1090, 1190), a build platform (230, 630, 830, 930, 1030, 1130) for supporting a powder bed and the build platform 230, 630, 830, 930, 1030, 1130 lowerable in the build sleeve (290, 690, 790, 890, 990, 1090, 1190). A heating element (201, 801, 901, 1001, 1101, 895, 896, 995, 996, 1095, 1096, 1195, 1196) is integrated in or located on the build platform (230, 630, 830, 930, 1030, 1130) or the build sleeve (290, 690, 890, 990, 1090, 1190). A seal (209, 210, 211, 809, 810, 811) is provided for sealing a gap between the build platform (230, 630, 830, 930, 1030, 1130) and the build sleeve (290, 690, 890, 990, 1090, 1190) to prevent powder from passing through the gap. A build chamber (202) is provided for maintaining an inert atmosphere both above and below the build platform (230, 630, 830, 930, 1030, 1130).