Additive machine utilizing rotational build surface

1. An apparatus for manufacturing an axi-symmetric part, the apparatus comprising:

a vessel configured to contain a powder, one or more walls of the vessel defining supports configured to rotatably receive a workpiece such that at least a portion of the workpiece contacts the powder contained within the vessel;

a first energy source configured to generate a first beam of energy to melt the powder at a first radial location such that the melted powder fuses to the workpiece at the first radial location; and

a means for rotating the workpiece around an axis between the first radial location and a second radial location such that at least a portion of the workpiece at the second radial location contacts the powder contained within the vessel and the first radial location of the workpiece is submerged in the powder.

2. The apparatus according to claim 1 , wherein the first energy source is configured to generate the first beam of energy to melt the powder at the second radial location such that the melted powder fuses to the workpiece at the second radial location.

3. The apparatus according to claim 2 , wherein the means for rotating the workpiece around the axis includes an indexing motor that is configured to move the workpiece radially a predetermined distance.

4. The apparatus according to claim 3 , further comprising a computer control configured to activate the first energy source such that the first beam is directed to an intersection of a powder level and a surface of the workpiece at a first location.

5. The apparatus according to claim 4 , further comprising a second energy source configured to generate a second beam of energy to fuse the powder at a second location within the intersection of the powder level relative to the workpiece.

6. A method for manufacturing an axi-symmetric part using a powder-fed additive manufacturing system that includes a vessel that is configured to contain a powder, one or more walls of the vessel defining supports to rotatably support a workpiece and that includes a first energy source configured to generate a first energy beam sufficient to melt the powder at a predetermined location, the method comprising the steps of:

operating the first energy source;

fusing the powder onto a surface of the workpiece when the workpiece is at a first radial position to form a first fused layer;

rotating the workpiece to a second radial position such that the first radial location of the workpiece is submerged in the powder;

fusing the powder onto a surface of the workpiece when the workpiece is at the second radial position;

rotating the workpiece to the first radial position; and

fusing the powder onto the first fused layer to form a second fused layer.

7. The method according to claim 6 , further comprising the steps of:

rotating the workpiece to the second radial position and fusing the powder onto the previously fused material at the second radial position.

8. The method according to claim 6 , further comprising the steps of operating a second energy source to generate a second energy beam;

fusing the powder to the workpiece at a third radial location.

9. The method according to claim 8 , further comprising the steps of:

rotating the workpiece;

fusing the powder at a fourth radial position on the workpiece; and

fusing the powder at a fifth radial position on the workpiece.

10. The method according to claim 6 , further comprising a step of cleaning a surface of the workpiece after the fusing step.

11. The method according to claim 10 , wherein the step of cleaning occurs while the workpiece is rotating.

12. The method according to claim 6 , wherein the axi-symmetric part includes a non-sacrificial hub held by a mandrel.

13. The method according to claim 6 , wherein the workpiece is configured as a mandrel about which an axi-symmetric part is manufactured and the mandrel is removed from the part to form a bore within the part.

14. An apparatus for manufacturing an axi-symmetric part, the apparatus comprising:

a box defining a reservoir configured to contain a powder;

supports defined by one or more walls of the box for supporting the part such that the part is rotatable;

the supports being configured such that the part is in contact with the powder;

a motor for indexing the part between multiple predetermined radial positions; and

an energy source configured to fuse the powder to the part at each radial position while another of the radial positions is submerged in the powder.

15. The apparatus according to claim 1 , further comprising:

a gas source fluidly connected to the vessel for providing a flow of gas into the vessel.

16. The method of claim 6 , further comprising a step of providing a flow of fluidizing gas into the vessel.

17. The apparatus according to claim 14 , further comprising:

a gas source fluidly connected to the reservoir for providing a flow of gas into the reservoir.

18. The apparatus according to claim 1 , further comprising:

a powder-fed laser tip for depositing and fusing additive powder onto the workpiece at a location above a powder level within the vessel, the additive powder being deposited in a uniform stream concentrically around the powder-fed laser tip.

19. The method of claim 6 , further comprising a step of:

depositing and fusing additive powder onto the workpiece at a location above a powder level within the vessel using a powder-fed laser tip, the additive powder being deposited in a uniform stream concentrically around the powder-fed laser tip.

20. The apparatus according to claim 14 , further comprising:

a powder-fed laser tip for depositing and fusing additive powder onto the part at a location above a powder level within the reservoir, the additive powder being deposited in a uniform stream concentrically around the powder-fed laser tip.