US 11,890,680 B2
Piston for a printhead of a 3D printer and printhead for a 3D printer
Benjamin Schaeuffele, Vaihingen/Enz (DE); Benjamin Schweizer, Horb (DE); Eberhard Maier, Koengen (DE); and Viktor Friedrich, Sersheim (DE)
Assigned to Robert Bosch GmbH, Stuttgart (DE)
Appl. No. 16/766,839
Filed by Robert Bosch GmbH, Stuttgart (DE)
PCT Filed Oct. 15, 2018, PCT No. PCT/EP2018/078002
§ 371(c)(1), (2) Date Oct. 19, 2020,
PCT Pub. No. WO2019/101438, PCT Pub. Date May 31, 2019.
Claims priority of application No. 10 2017 221 156.3 (DE), filed on Nov. 27, 2017; and application No. 10 2017 221 959.9 (DE), filed on Dec. 5, 2017.
Prior Publication US 2021/0146430 A1, May 20, 2021
Int. Cl. B22D 23/00 (2006.01); B33Y 30/00 (2015.01); B22F 3/115 (2006.01); B22F 10/22 (2021.01); B22F 12/13 (2021.01); B22F 12/00 (2021.01); B22F 12/50 (2021.01); B22F 12/53 (2021.01)
CPC B22F 3/115 (2013.01) [B22D 23/003 (2013.01); B22F 10/22 (2021.01); B22F 12/13 (2021.01); B22F 12/38 (2021.01); B22F 12/50 (2021.01); B22F 12/53 (2021.01); B33Y 30/00 (2014.12)] 5 Claims
OG exemplary drawing
 
1. A printhead (1) for a 3D printer, the printhead (1) comprising:
a piston (5) for a printhead (1) of a 3D printer, the piston (5) comprising a piston rod (17) and a plunger (18) connected to the piston rod (17), wherein the plunger (18) has a pressure side (19), which has a surface (39) that is convex or tapers to a point,
a housing (3);
a device (28) for supplying a metal (14);
a reservoir (7, 27) for a liquid phase (8) of the metal (14); and
a nozzle device (2) having a guide sleeve (11) and a nozzle plate (9),
wherein the plunger (18), the guide sleeve (11) and the nozzle plate (9) form a displacement space (21), wherein the plunger (18) and the guide sleeve (11) form at least one region (40) for conducting the liquid phase (8) between the reservoir (27) and the displacement space (21),
wherein the region (40) has a gap (46) for a discharge of gas inclusions from the displacement space (21) into the reservoir (7, 27), and
wherein the gap (46) is formed as an annular gap in a first plane (41) arranged on the pressure side (19) of the plunger (18) and is formed as at least one axial recess in a second plane (42).