发明人：
AMMANN, THOMAS | HIBBITT, IAN | BAUER, DOMINIK | COROADO, JULIO
摘要：
The present invention relates to a device and a method for DED or WAAM, comprising a welding torch (1 ) configured to generate an arc for generating a melt pool on a surface of a workpiece (2), and a wire feeder configured to feed a wire towards the melt pool to generate a weld seam on said surface, and an enclosure (4) enclosing at least part of the workpiece (2) and comprising a process atmosphere with a process gas, wherein a sucking device (5) sucks part of the process gas out of the enclosure (4) and thereafter re-introduces the process gas into the process atmosphere, and wherein the enclosure (4) comprises or consists of a flexible housing or a tent and in the sucking device (5) is connected to a buffer volume or a pressure stabilizing unit (10).
权利要求：
Claims
1. A device (1 ) for direct energy deposition additive manufacturing, in particular for wire-arc additive manufacturing, comprising:
- a welding torch (1 ) configured to generate an arc for generating a melt pool on a surface of a workpiece (2), and
- a wire feeder configured to feed a wire towards the melt pool to generate a weld seam on said surface, and
- an enclosure (4) enclosing at least part of the workpiece (2) and comprising a process atmosphere with a process gas,
- a sucking device (5) configured to suck part of the process gas out of the enclosure (4) and thereafter to re-introduce the process gas into the process atmosphere, characterized in that the enclosure (4) comprises or consists of a flexible housing or a tent and in that the sucking device (5) is connected to a buffer volume or a pressure stabilizing unit (10).
2. Device according to claim 1 , characterized in that a nozzle (7) is provided for re introducing the gas into the process atmosphere wherein the nozzle (7) is placed next to the welding torch (1 ).
3. Device according to any of the preceding claims, characterized in that the sucking device (5) is connected to a cleaning unit (8) for cleaning the process gas prior to re-introduction into the process atmosphere.
4. Device according to claim 4, characterized in that the cleaning unit (8) comprises a cyclone.
5. Device according to any of the preceding claims, characterized in that the sucking device (5) is connected to a heat exchanger or a cooling unit (9) for cooling the process gas prior to re-introduction into the process atmosphere.
6. Device according to any of the preceding claims, characterized in that the sucking device (5) comprises a pump or a compressor.
7. A method for direct energy deposition additive manufacturing, in particular wire- arc additive manufacturing, of a workpiece layer by layer (3a, 3b, 3c), wherein a melt pool is generated on a surface of the workpiece (2) to be formed and a metal wire is fed towards the melt pool to generate a weld seam, wherein the melt pool is enclosed by an enclosure and a process atmosphere with a process gas is provided within the enclosure, and wherein part of the process gas is withdrawn from the process atmosphere and subsequently re-introduced into the process atmosphere, characterized in that the enclosure (4) comprises or consists of a flexible housing or a tent and in that the pressure within the enclosure is maintained at an over-pressure between 2 and 50 mbar, preferably between 2 and 25 mbar, preferably between 5 and 20 mbar.
8. Method according to claim 7, characterized in that the process gas is withdrawn from the process atmosphere and passed out of the enclosure.
9. Method according to any of claims 7 or 8, characterized in that the process atmosphere comprises argon, nitrogen and/or helium.
10. Method according to any of claims 7 to 9, characterized in that the process gas is cleaned and/or cooled prior to being re-introduced into the process atmosphere.