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US 12,521,935 B2Granted
Method for minimizing stress-related deformations in 3D printed and sintered parts
AssigneeMarkforged, Inc.
InventorsGregory Thomas Mark, Rick Bryan Woodruff
Life of this patent
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Abstract
A method for printing three-dimensional parts includes building a three-dimensional part by printing counter-wound slices. By winding adjacent slices in alternating directions, offsetting stored torques can be produced for each printed slice. The stored torques then neutralize one another during the debinding and sintering process, reducing part twists and deformations.
Claims10
A method for building a green part with a deposition-based additive manufacturing system, the method comprising the steps of:
- depositing a first layer of the green part in a first winding direction along at least one first toolpath, the first layer including a polymer and a powdered sinterable metal, each first toolpath in the first layer being deposited in the first winding direction and producing a tendency to twist about a vertical axis;
- and
- depositing a second layer of the green part in a second winding direction opposite to the first winding direction and along at least one second toolpath, the second layer including the polymer and the powdered sinterable metal, each second toolpath in the second layer being deposited in the second winding direction,
- wherein depositing the second layer of the green part includes depositing the second layer of the green part in the second winding direction such that, when the polymer is removed from the first layer and the second layer permitting the first and second layers to relax, a directional stress in the second layer offsets a directional stress in the first layer offsetting the tendency to twist about the vertical axis.
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Dependencies are inferred from the claim text.