Abstract: The invention relates to a printhead (1) for a 3D printer, particularly a metal printer, comprising a housing (3), a device (28) for supplying a metal (14), a reservoir (7, 27), a nozzle device (2) and a piston (5), the nozzle device (2) comprising a guide sleeve (11), a nozzle plate (9) provided with an outlet (10), and a clamping device (4). The nozzle plate (9) and the guide sleeve (11) are mutually elastically braced by means of the clamping device (4), and the guide sleeve (11) and the reservoir (7, 27) are mutually elastically braced by means of the clamping device (4).

Abstract: The invention relates to a piston (5) for a printhead (1) of a 3D printer, particularly a metal printer, comprising a piston rod (17) and a ram (18), the ram (18) having a discharge side (19) that has a convex or tapering surface (39). The invention also relates to a printhead (1) for a 3D printer, particularly a metal printer, comprising a housing (3), a device (28) for supplying a metal (14), a reservoir (7, 27) for a liquid phase (8) of the metal (14), a nozzle device (2) comprising a guide sleeve (11) and a nozzle plate (9), and a piston (5) according to one of the preceding claims, the ram (18), the guide sleeve (11) and the nozzle plate (9) forming a displacement chamber (21), and the ram (18) and the guide sleeve (11) forming at least one area (40) for conducting the liquid phase (8) between the reservoir (27) and the displacement chamber (21).

Abstract: The invention relates to a method of attaching a gasket (4) to a bipolar plate (12). The method comprises the steps of applying and aligning a first gasket foil (4a) to a second gasket foil (4b) having connection recesses (8), connecting the first gasket foil (4a) to the second gasket foil (4b), so that the gasket (4) is formed, placing the gasket (4) on the bipolar plate (12) so that the second gasket film (4b) with the bonding recesses (8) abuts the bipolar plate (12) and performing an embossing step in which an embossing force is applied with an embossing tool (20) in the region of the connecting recesses (8) so that an embossed adhesive point (24) is formed and the first gasket foil (4a) is bonded to the bipolar plate (12) via an adhesive means (16) arranged in the connecting recess (8) on the first gasket foil (4a).

Abstract: A method for assembling an electrochemical cell stack is proposed, which has the following steps: assembling a first stack component (140), which has a first adjustment opening (115), on an electrochemical substack through cooperation between the first adjustment opening (115) and a first adjustment device (110). Repositioning the first adjustment device (110) in the construction direction of the electrochemical substack for locally adjusted assembly of a second stack component, which has a corresponding first adjustment opening for locally adjusted assembly.

Abstract: The present invention relates to a bipolar plate (100, 200, 403, 405, 407, 409, 500) for a fuel cell, wherein the bipolar plate (100, 200, 403, 405, 407, 409, 500) comprises at least one fluid channel (101, 103, 105, 201, 203, 205, 207, 209, 501) for transporting operating fluids of the fuel cell, wherein the at least one fluid channel (101, 103, 105, 201, 203, 205, 207, 209, 501) comprises an inlet opening for introducing fluid into the at least one fluid channel (101, 103, 105, 201, 203, 205, 207, 209, 501) and an outlet opening for fluid exiting the at least one fluid channel (101, 103, 105, 201, 203, 205, 207, 209, 501), wherein the at least one fluid channel (101, 103, 105, 201, 203, 205, 207, 209, 501) comprises a first region (107, 211, 503) and at least one second region (109, 213, 507), and wherein the at least one second region (109, 213, 503) has a cross-section which is reduced compared to the first region (107, 211, 507) in order to adjust a volumetric flow of fluid which exits the outlet opening

Abstract: The invention relates to a fuel cell stack (100) having at least one fuel cell (101) which has a membrane (CCM) for separating an anode side (A) of the fuel cell (101) from a cathode side (K) of the fuel cell (101), an anode-side gas diffusion layer (GDLA), a cathode-side gas diffusion layer (GDLK) and a bipolar plate (BPP) for separating the fuel cell (101) from an adjacent fuel cell (101) or a housing. According to the invention, the membrane (CCM) protrudes beyond the anode-side gas diffusion layer (GDLA) and the cathode-side gas diffusion layer (GDLK) in an edge region (R) located outside an active area (AF) of the membrane (CCM), and the membrane (CCM) has a centering dam (10) in the edge region (R) of the anode side (A) or of the cathode side (K).

Abstract: The invention relates to a print head (1) for a 3D printer, in particular a metal printer, comprising a housing (3), a device (28) for feeding a metal (14), a piston (5), a reservoir (7, 27) with an outlet opening (10) and an actuator device (12) for displacing the piston (5), wherein the reservoir (7, 27) has a melt region (20) and a displacement body chamber (21) for a liquid phase (8) of the metal (14), wherein the melt region (20) adjoins an inert atmosphere (22) and is connected to the displacement body chamber (21) such that, as a result of the displacement of the piston (5), the liquid phase (8) of the metal (14) can be stimulated to pass through the outlet opening (10), said housing (3) having a multi-part design and comprising at least one cooling flange (25), an insulating plate (26) and the reservoir (7, 27). The invention is characterized in that the reservoir (7, 27) is connected to the cooling flange (25) and/or theinsulating plate (26) by a centering device (50).

Abstract: The invention relates to a device (100) for the additive manufacture of three-dimensional workpieces, in particular a 3D metal printer, comprising a print head (1) and a device (40) for generating an inert atmosphere (22) within the print head (1) by means of a gas (55), in particular inert gas, wherein the print head (1) comprises a housing (3), a device (28) for feeding a metal (14), a piston (5), a reservoir (7) with an outlet opening (10) and an actuator device (12) for displacing the piston (5), wherein the reservoir (7) has a melt region (20) and a displacement body chamber (21) for a liquid phase (8) of the metal (14), wherein the melt region (20) adjoins the inert atmosphere (22) and is connected to the displacement body chamber (21) such that, as a result of the displacement of the piston (5), the liquid phase (8) of the metal (14) can be caused to pass through the outlet opening (10).

Abstract: The invention relates to a method for the rapid manufacture of a three-dimensional workpiece from a molten material (1), in particular a molten metal, in which method the molten material (1) is supplied to a compression chamber (2) and delivered in drop form via an injector hole (4) by means of a pressure pulse which is generated with the aid of a reciprocating piston (3) that delimits the compression chamber (2). According to the invention, the compression chamber (2) is degassed before manufacturing begins and/or during a pause in the manufacturing. In a first step, ultrasonic waves are coupled into the molten material (1) in the compression chamber (2), which generate a force (FBjrk) that makes the gas in the molten material (1) sink, and in a second step, after the ultrasonic excitation has ended, the piston (3) is introduced deeper into the compression chamber (2) in order to remove the rising gas via a conduit (5) of the piston (3).

Abstract: The invention relates to a print head (1) for additively manufacturing three-dimensional workpieces, comprising a housing (3), a device (28) for feeding a metal (14), a piston (5), a reservoir (7) with an outlet opening (10) and an actuator device (12) for displacing the piston (5), wherein the reservoir (7, 27) has a melt region (20) and a displacement body chamber (21) for a liquid phase (8) of the metal (14), wherein the melt region (20) adjoins the inert atmosphere (22) and is connected to the displacement body chamber (21) such that, as a result of the displacement of the piston (5), the liquid phase (8) of the metal (14) can be stimulated to pass through the outlet opening (10), said outlet opening (10) being mounted on an insert (11) of the print head (1). The invention is characterised in that the print head (1) comprises a device (50) for feeding a protective gas (60) to the outlet opening (10) of the print head (1).

Abstract: The invention relates to a method for the additive manufacturing of a three-dimensional workpiece from a liquid material (1), in which method the liquid material (1) is fed to a displacement chamber (2) and discharged in drop form via a jet hole (4) by means of a pressure pulse which is generated with the aid of a reciprocating piston (3) delimiting the displacement chamber (2). According to the invention, in order to optimise the wetting properties of at least one surface (5, 6) which delimits the displacement chamber (2) and/or the jet hole (4), sound waves are coupled into the liquid material (1) for a limited period of time with the aid of the piston (3) which is caused to vibrate for this purpose. The invention also relates to a device for carrying out the method according to the invention.

Abstract: The invention relates to a device (100) for the additive manufacture of three-dimensional workpieces, in particular a 3D metal printer, comprising a print head (1) and a device (40) for generating an inert atmosphere (22) within the print head (1) by means of a gas (55), in particular inert gas, wherein the print head (1) comprises a housing (3), a device (28) for feeding a metal (14), a piston (5), a reservoir (7) with an outlet opening (10) and an actuator device (12) for displacing the piston (5), wherein the reservoir (7) has a melt region (20) and a displacement body chamber (21) for a liquid phase (8) of the metal (14), wherein the melt region (20) adjoins the inert atmosphere (22) and is connected to the displacement body chamber (21) such that, as a result of the displacement of the piston (5), the liquid phase (8) of the metal (14) can be caused to pass through the outlet opening (10).

Abstract: The invention relates to a piston (5) for a printhead (1) of a 3D printer, particularly a metal printer, comprising a piston rod (17) and a ram (18), the ram (18) having a discharge side (19) that has a convex or tapering surface (39). The invention also relates to a printhead (1) for a 3D printer, particularly a metal printer, comprising a housing (3), a device (28) for supplying a metal (14), a reservoir (7, 27) for a liquid phase (8) of the metal (14), a nozzle device (2) comprising a guide sleeve (11) and a nozzle plate (9), and a piston (5) according to one of the preceding claims, the ram (18), the guide sleeve (11) and the nozzle plate (9) forming a displacement chamber (21), and the ram (18) and the guide sleeve (11) forming at least one area (40) for conducting the liquid phase (8) between the reservoir (27) and the displacement chamber (21).

Abstract: The invention relates to a printhead (1) for a 3D printer, particularly a metal printer, comprising a housing (3), a device (28) for supplying a metal (14), a reservoir (7, 27), a nozzle device (2) and a piston (5), the nozzle device (2) comprising a guide sleeve (11), a nozzle plate (9) provided with an outlet (10), and a clamping device (4). The nozzle plate (9) and the guide sleeve (11) are mutually elastically braced by means of the clamping device (4), and the guide sleeve (11) and the reservoir (7, 27) are mutually elastically braced by means of the clamping device (4).

Abstract: An axial piston machine for at least one of a pump and a motor operation includes a housing, connection plate, piston drum, and working piston. The connection plate is connected to the housing. The piston drum is arranged on a rotatable drive shaft in the housing interior and defines at least one cylinder bore. The working piston is arranged in a longitudinally displaceable manner in the cylinder bore. The cylinder bore delimits a cylinder space having a changeable volume. The cylinder space is configured to connect to at least one pre-compression space via at least one hydraulic connection. The at least one pre-compression space is defined by a cavity within the connection plate. The cavity is defined by the connection plate and a closing element. The closing element is arranged between the connection plate and the housing interior.

Abstract: The invention relates to a waste heat recovery system having a working fluid circuit (1) for an internal combustion engine, comprising a first heat exchanger (2a) connected in an exhaust gas line (3) of the internal combustion engine (5) and a second heat exchanger (2b) inserted into a line, which are part of the working fluid circuit (1), which has at least an expansion machine (11), a condenser (12), and a fluid pump. According to the invention, a waste heat recovery system that is improved in particular in respect of an efficiency of the system is provided. This is achieved in that each of the two heat exchangers (2a, 2b) is assigned a fluid pump (15a, 15b). Said fluid pumps (15a, 15b) are combined in a two-stroke vane cell pump (16).

Abstract: The invention relates to a waste-heat utilisation assembly (1) of an internal combustion engine (50), comprising a working circuit (2) that conducts a working fluid. In said working circuit (2) are arranged, in the direction of flow of the working fluid, a feed pump (6), an evaporator (10), an expansion machine (3) and a condenser (4). The evaporator (10) is also arranged in an exhaust tract (53) of said internal combustion engine (50). Between the evaporator (10) and the condenser (4), an auxiliary line (2b) is connected in parallel to the working circuit (2). According to the invention, a sub-stream evaporator (12) is arranged in the auxiliary line (2b) and a pressure sensor (14) and/or a temperature sensor (13) are also arranged in said auxiliary line (2b), said pressure sensor (14) and/or temperature sensor (13) being arranged downstream of the sub-stream evaporator (12).

Abstract: An axial piston machine for at least one of a pump and a motor operation includes a housing, connection plate, piston drum, and working piston. The connection plate is connected to the housing. The piston drum is arranged on a rotatable drive shaft in the housing interior and defines at least one cylinder bore. The working piston is arranged in a longitudinally displaceable manner in the cylinder bore. The cylinder bore delimits a cylinder space having a changeable volume. The cylinder space is configured to connect to at least one pre-compression space via at least one hydraulic connection. The at least one pre-compression space is defined by a cavity within the connection plate. The cavity is defined by the connection plate and a closing element. The closing element is arranged between the connection plate and the housing interior.

Abstract: Waste heat utilization arrangement (1) of an internal combustion engine (50), comprising a main circuit (2) which carries a working medium, wherein a feed pump (6), an evaporator (10), an expansion machine (3) and a condenser (4) are disposed in the main circuit (2) in the direction of flow of the working medium. The evaporator (10) is also disposed in an exhaust duct (53) of the internal combustion engine (50). The waste heat utilization arrangement (1) comprises a secondary line (20) which can be connected to the main circuit (2). A filter element (5) is disposed in the secondary line (2b, 20, 30).

Abstract: The pump comprises at least one pump element which has a pump piston that is at least indirectly driven in a stroke movement by a drive shaft. A plunger having a plunger body is arranged between the drive shaft and the pump piston and is movably guided in a receiving device in the direction of the stroke movement of the pump piston and is supported on the drive shaft by means of a support element. Lubricant is supplied to the receiving device via a supply line and lubricant is conducted out of the receiving device via a discharge line into the plunger body to the support element. An annular gap filter is provided between the plunger body and the receiving device and is arranged between the supply line for supplying lubricant to the receiving device and the discharge line for discharging lubricant into the plunger body.