Module for additive manufacturing apparatus and method

1. An additive manufacturing apparatus comprising a build chamber that includes a build chamber window, and a module that includes more than one optical train, each optical train providing a route for a laser beam to pass through the module and comprising steering optics for steering the laser beam towards material to be consolidated as part of a layer-by-layer additive manufacturing process,

wherein the module comprises a single aperture common to the more than one optical train, and the module is configured to deliver laser beams from the more than one optical trains through the single aperture and the build chamber window, and wherein the build chamber window comprises a single window comprising optically transparent material.

2. The additive manufacturing apparatus of claim 1 , wherein the more than one optical train of the module includes (i) a first optical train providing a first route for a first laser beam to pass through the module and comprising first steering optics for steering the first laser beam towards the material to be consolidated as part of the layer-by-layer additive manufacturing process, and (ii) a second optical train providing a second route for a second laser beam to pass through the module and comprising second steering optics for steering the second laser beam towards the material to be consolidated as part of the layer-by-layer additive manufacturing process.

3. The additive manufacturing apparatus of claim 2 , the module comprising a fixing point or points for attaching the module to the build chamber of the additive manufacturing apparatus so the module bridges the build chamber window.

4. The additive manufacturing apparatus of claim 2 , the module comprising a single aperture common to the more than one optical train.

5. The additive manufacturing apparatus of claim 2 , further comprising a common thermal circuit thermally connecting each of the more than one optical trains, and wherein the common thermal circuit is a cooling circuit comprising cooling channels.

6. The additive manufacturing apparatus of claim 5 , the module comprising a single aperture common to the more than one optical train wherein the cooling circuit cools the module in a vicinity of the single aperture common to the more than one optical trains.

7. The additive manufacturing apparatus of claim 2 wherein each of the first and second optical trains defines an irradiation volume of its laser beam in use, and wherein an irradiation volume overlap of the first and second optical trains encompasses at least part of the build chamber window.

8. The additive manufacturing apparatus of claim 2 wherein the module comprises an additively built housing.

9. An additive manufacturing apparatus comprising the module of claim 2 further comprising a plurality of modules arranged as an array.

10. The additive manufacturing apparatus as claimed in claim 9 wherein the array is a one-dimensional array.

11. The additive manufacturing machine as claimed in claim 10 wherein the plurality of modules of the array are elongate modules and arranged together along a minor axis.

12. The additive manufacturing machine as claimed in claim 1 wherein the module is movable along a linear axis.

13. The additive manufacturing apparatus as claimed in claim 9 wherein the array is a two-dimensional array.

14. The additive manufacturing apparatus as claimed in claim 13 wherein the two-dimensional array comprises more than two modules in a first direction.

15. The additive manufacturing apparatus as claimed in claim 14 wherein the two-dimensional array comprises more than two modules in a second direction.

16. The additive manufacturing apparatus according to claim 15 wherein the first and second directions are orthogonal directions.

17. The additive manufacturing apparatus as claimed in claim 1 wherein the module is arranged such that a footprint of the module on a build chamber is not greater than the area which may be irradiated by the module on a working plane.

18. A module for an additive manufacturing apparatus in which material is consolidated as part of a layer-by-layer additive manufacturing process;

the module comprising more than one optical train and a single aperture common to the more than one optical train, each optical train providing a route for a laser beam to pass through the single aperture and be directed towards the material to be consolidated;

wherein the more than one optical trains are provided within a single piece housing.

19. A module as claimed in claim 18 wherein the housing is an additively built housing.

20. A module for an additive manufacturing apparatus comprising:

more than one optical train, each optical train providing a route for a laser beam to pass through the module and comprising steering optics for steering the laser beam towards material to be consolidated as part of a layer-by-layer additive manufacturing process; and

a common thermal circuit that thermally connects each of the more than one optical trains,

wherein the module is configured to deliver laser beams from the more than one optical trains through a single window in a build chamber of the additive manufacturing apparatus.

21. A module for an additive manufacturing apparatus in which material is consolidated as part of a layer-by-layer additive manufacturing process, the module comprising a lower face having an aperture, a module window closing the aperture, and more than one optical train, each optical train providing a route for a laser beam to pass through the module and be directed towards the material to be consolidated,

wherein the laser beams are directed through the aperture and the aperture is a single aperture common to the more than one optical trains provided by the module, and wherein the module is configured to deliver laser beams from the more than one optical train through a single window in a build chamber of the additive manufacturing apparatus.