摘要:
Machine tools combine material addition via ultrasonic object consolidation and subtractive techniques for imparting high-dimensional accuracy to a finished object. A material supply and feeder, ultrasonic horn, and feedstock cutting device are integrated with a material removal subsystem preferably including a cutting tool and an excess material removal system. Any metal, plastic or composite material suitable for ultrasonic joining may be employed as a feedstock, and these material may assume the form of tapes, sheets, wires, filaments, dots or droplets, with the feeding and material cutting components being designed for the specific feedstock employed. The cutting tool for excess material removal, may be a knife, drill/mill, grinding tool, or other tool capable of accurately cutting the external contour of a cross section of the part being built, and for removing excess feedstock remaining following the application process. The material removal could consist of a vacuum or blower system, chip auger, or other suitable apparatus. A machine disclosed as part of the preferred embodiment is able to deposit material in one step, and optionally and selectively remove it in another. Through the expeditious combination of deposition and removal, the fabrication of objects of arbitrary shape may be realized.
摘要:
Anti-tamper enclosures for electronic devices incorporate a variety of passive and active anti-tampering techniques in a novel way, using highly specialized manufacturing techniques that uniquely and innovatively allow such enclosures to be fabricated. Different embodiments include, alone or in combination, enclosures that prevent x-ray and field-ion-beam characterization of the device; detect attempts to mechanically open the enclosure via prying, cutting, machining, etc.; support wireless communication out of the enclosure so that attempts to tamper with the device can be reported to a user; allow insertion of “decoy” devices; and provide a method of destroying the device as a response to a tampering attempt.
摘要:
Methods of fabricating a metal-matrix composite materials comprise the steps of providing a plurality of fibers, providing a plurality of metal wires, positioning the wires and fibers in alternating fashion on a substrate, covering the wires and fibers with a layer of metal to create a multi-layer composite, and ultrasonically consolidating the composite. Titanium, aluminum and alloys and other metals are applicable to the process. The fibers may be boron, silicon carbide, glass, alumina and other common reinforcements or, alternatively, optical fibers, shape-memory fibers, piezo-ceramic fibers may be used. The fibers or the wires may be of uniform or varying composition, and may b are applied to a working surface separately or simultaneously, in which case they may be collimated and delivered to a working surface in aligned fashion.
摘要:
Provided are electro-hydrodynamic (EHD) system for extracting energy from wind. Also provided are injectors for producing particles in an EHD system. Additionally, methods for producing particles in an EHD system is also provided. Further provided are displays comprising an EHD wind energy system. Also, an electro-hydrodynamic wind energy system integrated with a display is provided. A method of generating electricity is also provided. Additionally, a method of displaying a message is provided.
摘要:
A continuous, single-step, low-temperature process combines metal coating with the splicing of fibers, producing a single, continuous low-cost process for embedding fibers in metal, and/or the splicing of fibers with a joint featuring uniform composition and high strength requiring no additional adhesives. The method can be used to create terminations for cables, or it can be used as a method of splicing or joining optical fibers by positioning the ends of the two fibers under the foils, so that they abut prior to creating the bond. The consolidation material may be provided in sheets, with or without fiber-locating grooves or, alternatively, droplets may be used. In the preferred embodiment, ultrasonic vibrations are used as the source of consolidation energy. A range of metals are suited to the process, including aluminum, copper, titanium, nickel, iron and their alloys as well a numerous other metals of more limited structural utility.
摘要:
A system and a method of fabricating a three-dimensional object on a substrate includes adding material layers incrementally and consolidating the layers by using ultrasonic vibrations and pressure. The layers are placed in position to shape the object by a material feeding unit, and they come in various forms, including flat sheets, segments of tape, strands of filament or single dots of material. The material may be plastic or metallic, and composition may vary discontinuously or gradually from one layer to the next, creating a region of functionally gradient material. The invention permits the construction and repair of dense objects, including fiber-reinforced composites and aerospace structures. Excess material may be removed one or more layers are bonded, including following end of the process after the final object is fabricated. The layers are fed sequentially and additively according to a layer-by-layer computer-model description of the object, which is generated by a computer-aided design/manufacturing (CAD/CAM) system. Ultrasonic welding equipment applicable to the invention preferably includes an ultrasonic generator, a transducer, a booster and a head unit or sonotrode.
摘要:
A system for electro-hydrodynamically extracting energy from wind includes an upstream collector that is biased at an electric potential and induces an electric field. An injector introduces a particle into the electric field. The wind drag on the particle is at least partially opposed by a force of the electric field on the particle. A sensor monitors an ambient atmospheric condition, and a controller changes a parameter of the injector in response to a change in the atmospheric condition.
摘要:
Solid-state bonding technologies are combined with other solid-state consolidation techniques to create new processes, applications, and structures. One embodiment uses metal or plastic spraying techniques with the intention of only partially bonding the droplets to the substrate, while employing a secondary process such as ultrasonic and/or electrical resistance consolidation to achieve complete agglomeration and eliminate porosity. This opens new opportunities with regard to materials, powder types, applications, and automated machinery. Some examples of these hybrids and their applications are provided, however, along with the identification of other combinations.
摘要:
In ultrasonic object consolidation, the location of the sonotrode may be independent, and selected (like other processing parameters such as amplitude, frequency, force, and speed), for optimum processing. According to one preferred embodiment, the improvement includes welding certain regions of the object multiple times. Alternatively or in conjunction with other steps, the method includes the act of selecting sonotrode position to minimize bulk motion of the object. The invention improves upon the existing art by optimizing the positioning of the sonotrode relative to the geometry. This may, for example, comprise independently positioning the horn to treat one or more features within a cross section of the object differently, or determining tape placement location and tacking the feedstock in advance of welding. The feedstock may be provided in any suitable form, including wires, tapes and dots.
摘要:
Fibers and layers are co-applied using ultrasonic consolidation and providing steps and/or materials to maintain collimation of the fibers. According to one preferred embodiment the mechanism is a scrim. Alternatively the mechanism may include a material having one or more fibers under a foil layer. The mechanism may further include embedding a layer of fibers in a foil in a “tacking” process, and consolidating the result with an underlying substrate. Yet a further alternative includes interspersing metal fibers between reinforcing fibers. The reinforcing fibers may include SiC, B or Al2O3 fibers. A different preferred method of co-applying fiber and metal using ultrasonic consolidation, comprises the steps of alternating either an encapsulation material or another metal with optical, ceramic, shape-memory, or other fibers of interest, and encapsulating the result between layers of foil.
摘要翻译:使用超声波固结共同施加纤维和层,并提供步骤和/或材料以保持纤维的准直。 根据一个优选实施例,机构是稀松布。 或者,该机构可以包括在箔层下方具有一个或多个纤维的材料。 该机构可以进一步包括在“固定”过程中将一层纤维嵌入箔中,并将结果与底层基底固结。 另一种替代方案包括在增强纤维之间散布金属纤维。 增强纤维可以包括SiC,B或Al 2 O 3 N 3纤维。 使用超声波固结共同施加纤维和金属的不同优选方法包括以下步骤:将封装材料或另一种金属与光学,陶瓷,形状记忆或其它感兴趣的纤维交替,并将结果封装在箔层之间 。