A polishing method for an inner wall of a hollow metal part, including: firstly, placing a coaxial cathode in an inner hole of a metal part when a metal part model is designed, and printing the metal part model and the coaxial cathode together; then, sealing two ends of an inner hole cavity of the metal part by using a light curing part, fixing the coaxial cathode, filling the cavity with a polishing solution, and performing polishing treatment by using an electrochemical polishing method; and finally, reversing an electrode to break the coaxial cathode and take out the broken coaxial cathode to obtain a polished metal part. The polishing of a complex-shaped inner hole of a 3D-printed metal part is realized, the defect that an inner hole of a 3D-printed metal part with a complex-shaped hollow part cannot be polished by using a traditional machining method is overcome, the problem that an inner wall of a metal part polished by using an electrochemical method is non-uniform is solved, the surface quality of the inner hole of the 3D-printed metal part with the complex-shaped hollow part is improved, and the application prospect and postprocessing technology of the 3D-printed metal part are expanded.

A polishing method for an inner wall of a hollow metal part, including: firstly, placing a coaxial cathode in an inner hole of a metal part when a metal part model is designed, and printing the metal part model and the coaxial cathode together; then, sealing two ends of an inner hole cavity of the metal part by using a light curing part, fixing the coaxial cathode, filling the cavity with a polishing solution, and performing polishing treatment by using an electrochemical polishing method; and finally, reversing an electrode to break the coaxial cathode and take out the broken coaxial cathode to obtain a polished metal part. The polishing of a complex-shaped inner hole of a 3D-printed metal part is realized, the defect that an inner hole of a 3D-printed metal part with a complex-shaped hollow part cannot be polished by using a traditional machining method is overcome, the problem that an inner wall of a metal part polished by using an electrochemical method is non-uniform is solved, the surface quality of the inner hole of the 3D-printed metal part with the complex-shaped hollow part is improved, and the application prospect and postprocessing technology of the 3D-printed metal part are expanded.

The present disclosure relates to an additive manufacturing system. In one embodiment the system makes use of a reservoir for holding a granular material feedstock. A nozzle is in communication with the reservoir for releasing the granular material feedstock in a controlled fashion from the reservoir to form at least one layer of a part. An excitation source is included for applying a signal which induces a controlled release of the granular material feedstock from the nozzle as needed, to pattern the granular material feedstock as necessary to form a layer of the part.

Methods and apparatus for the fabrication of solid three-dimensional objects from liquid polymerizable materials at high resolution. A material is coated on a film non-digitally, excess material is removed digitally, by laser, leaving an image of a layer to be printed, and the image is then engaged with existing portions of an object being fabricated and exposed to a non-digital UV curing light source. Since the only part of the process that is digital is the material removal, and this part is done by laser, the speed of printing and the robustness of the manufacturing process is improved significantly over conventional additive or 3D fabrication techniques.

A three-dimensional shaping method includes a molded body forming step of forming a molded body having a plurality of projection portions using a material containing a powder and a binder, a supporting step of supporting the molded body by a support having groove portions at positions configured to insert each of the projection portions in a state where the plurality of projection portions are inserted into the groove portions, and a sintering step of sintering the powder by heating the molded body in a state of being supported by the support, wherein the groove portion is extended from an insertion position of the projection portion in a specified direction that specifies a direction of shrinkage of the molded body by performing the sintering step.

Network enabled 3D printing and automated processing techniques for oral devices are disclosed herein. An example technique includes receiving, via a network, a data file representative of a mouth of a user, and printing, by a 3D printer, a 3D oral device based on the data file. The example technique may further include automatically ejecting, from the 3D printer, the 3D oral device, and scanning the 3D oral device to generate a 3D scan file of the 3D oral device. The example technique may further include comparing the 3D scan file with the data file to determine at least one feature represented in the 3D scan file that exceeds a deviation threshold relative to a corresponding respective feature represented in the data file; and finishing, by a finishing module, the 3D oral device by smoothing the at least one feature on the 3D oral device.

Network enabled 3D printing and automated processing techniques for oral devices are disclosed herein. An example technique includes receiving, via a network, a data file representative of a mouth of a user, and printing, by a 3D printer, a 3D oral device based on the data file. The example technique may further include automatically ejecting, from the 3D printer, the 3D oral device, and scanning the 3D oral device to generate a 3D scan file of the 3D oral device. The example technique may further include comparing the 3D scan file with the data file to determine at least one feature represented in the 3D scan file that exceeds a deviation threshold relative to a corresponding respective feature represented in the data file; and finishing, by a finishing module, the 3D oral device by smoothing the at least one feature on the 3D oral device.

A mirrored apparatus includes a substrate having a surface and including an additive manufactured aluminum and about 2 to about 30 weight % (wt. %) silicon. The mirrored apparatus also includes a finish layer arranged directly on the surface of the substrate. The finish layer includes a polished surface opposite the substrate. The mirrored apparatus further includes a reflective layer arranged on the polished surface of the finish layer.

A mirrored apparatus includes a substrate having a surface and including an additive manufactured aluminum and about 2 to about 30 weight % (wt. %) silicon. The mirrored apparatus also includes a finish layer arranged directly on the surface of the substrate. The finish layer includes a polished surface opposite the substrate. The mirrored apparatus further includes a reflective layer arranged on the polished surface of the finish layer.

A high melt superalloy powder mixture is provided for use with additive manufacturing or welding metal components or portions thereof. The high melt superalloy powder may include by weight about 7.7% to about 18% chromium, about 10.6% to about 11% cobalt, about 4.5% to about 6.5% aluminum, about 10.6% to about 11% tungsten, about 0.3% to about 0.55% molybdenum, about 0.05% to about 0.08% carbon, and at least 40% nickel.