Cellular fabrication and apparatus for additive manufacturing
Freeform, additive manufacturing equipment, processes and products, including residential, commercial and other buildings. A movable extruder places extrudate that solidifies in open space to create “scaffolding” or “skeletons” of buildings and other products. Elongated extrudate elements are fused to each other or connected by other means to form a cellular structure. Filler material such as polymeric insulating foam may simultaneously or thereafter be placed within the cellular structure to contribute desired strength, rigidity, insulative, barrier or other properties. Finish materials may also be applied.
1. A process for freeform fabrication of a three-dimensional cellular matrix, the process comprising:
using an extrusion system to freeform extrude and join a plurality of individual struts into a cellular pattern defining the three-dimensional cellular matrix, the cellular pattern including a plurality of interstitial spaces;
locating at least one septum on or in the three-dimensional cellular matrix; and
at least partially filling at least some of the interstitial spaces with a first filler material;
wherein the at least one septum limits movement of the first filler material into portions of the three-dimensional cellular matrix; and
wherein the extrusion system includes at least one extruder including an extrusion head mounted on a multiple degree-of-freedom movement device.
2. The process of claim 1 , further comprising at least partially filing at least some of the interstitial spaces with a second filler material different from the first filler material, wherein the septum at least partially separates the first filler material from the second filler material.
3. The process of claim 1 , wherein the extrusion system extrudes material to form the septum.
4. The process of claim 1 , wherein the septum is a separately applied material.
5. A process for freeform fabrication of a three-dimensional cellular matrix, the process comprising:
using an extrusion system to freeform extrude and join a plurality of individual struts into a cellular pattern defining the three-dimensional cellular matrix; and
incorporating a reinforcing material into at least some of the individual struts during or prior to the freeform extruding;
wherein the extrusion system includes at least one extruder including an extrusion head mounted on a multiple degree-of-freedom movement device.
6. The process of claim 5 , further comprising applying the reinforcing material to at least some of the individual struts after the freeform extruding.
7. The process of claim 6 , wherein the reinforcing material coats outer surfaces of at least some of the individual struts.
8. The process of claim 7 , wherein applying the reinforcing material comprises spraying the reinforcing material.
9. The process of claim 5 , wherein incorporating the reinforcing material comprises adding a fiber or wire material during or prior to the freeform extruding.
10. The process of claim 5 , wherein extruding the individual struts comprises extruding the individual struts from at least two different material sources.