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344 results about "Additive process" patented technology

Additive process. (Photography) a photographic process in which the desired colours are produced by adding together appropriate proportions of three primary colours.

Spinning machining method for aluminium alloy thin-walled revolution body

The invention discloses a spinning machining method for an aluminium alloy thin-walled revolution body. The spinning machining method comprises the following steps: producing an aluminium alloy spun blank with required dimensions, and carrying out annealing treatment on the aluminium alloy spun blank; carrying out shearing spinning on the aluminium alloy spun blank to obtain a primary conical barrel; carrying out annealing treatment on the primary conical barrel, and cutting a process allowance at a large end to form a secondary conical barrel; carrying out common spinning on the secondary conical barrel on a spinning machine to obtain a pre-spun aluminium alloy thin-walled revolution body; and carrying out annealing treatment and surface polishing treatment on the pre-spun blank, and then cutting process allowances at the two ends of a spun part by using a plasma cutting machine, so as to obtain the aluminium alloy thin-walled revolution body meeting process requirements. According to the invention, the aluminium alloy thin-walled revolution body is machined by virtue of the technologies of shearing spinning and common spinning; the dimension and structural performance requirements of a bullet shell are met; a machining method and a stamping-welding method can be replaced; and a low-cost and efficient machining method is provided for machining for an aluminium alloy shell of a bullet.
Owner:湖北三江航天江北机械工程有限公司

Method for manufacturing printed circuit board by using novel and improved semi-additive process

The invention relates to a method for manufacturing a printed circuit board by using a novel and improved semi-additive process. The method includes the following steps that: a) a dielectric layer is prepared, and copper foil is pressed on the dielectric layer, so that a copper foil conductive layer can be formed, and as a result, a composite structure substrate can be formed, the roughness of the rough surface of the copper foil being smaller than 4 microns; b) the thickness of the copper foil conductive layer is reduced to 0.2 to 5 microns; c) through holes or blind holes are formed in the dielectric layer and the copper foil conductive layer; d) conductive treatment is performed on the copper foil conductive layer and the hole walls of the blind holes or through holes, so that a seed layer can be formed; e) a photosensitive film is bonded on the surface of the substrate, and an electroplating barrier layer is formed on the substrate through pattern transfer; f) electroplating is performed on the substrate; g) a metal protective layer is formed on the surface of a circuit pattern through using a chemical plating or electroplating method; h) the electroplating barrier layer is removed; i) the bare seed layer and copper foil conductive layer are removed through adopting a flash rusting method, and the circuit pattern formed through electroplating is reserved; j) the metal protective layer is removed; and k) processing in steps from a) to j) is performed on the circuit board repeatedly, so that a multi-layer circuit board can be formed.
Owner:SHANGHAI MEADVILLE SCI & TECH

Electric arc additive and electric auxiliary ultrasonic impact reinforcing composite manufacturing method and device

The invention relates to an electric arc additive and electric auxiliary ultrasonic impact reinforcing composite manufacturing method and device. The method is characterized in that an electric arc isused for melting a metal wire material; after the wire material is settled on a base sheet by one or more layers through a welding gun and a wire feeding mechanism, the base sheet and the settled layer are heated through a direct-current pulse power supply; and the temperature of the surface of the settled layer is acquired by a temperature sensor, and an ultrasonic impact device is used for carrying out ultrasonic impact on the surface of the settled layer when the temperature reaches a preset value. The device comprises the base sheet, a clamp, a workbench, the welding gun, the wire feedingmechanism, the temperature sensor, an ultrasonic generator, the ultrasonic impact device, an electrode, a wire, the direct-current pulse power supply and an insulating spacer. According to the method, pulse current auxiliary heating, ultrasonic impact reinforcing and an electric arc additive process are organically combined, the multi-field coupling effect of electricity, heat, sound and force isused for improving the forming precision of the settled layer and refining the grain size, so that the defects such as air holes and cracks and internal residual tensile stress generated in the electric arc additive process are eliminated, and the mechanical property of material is improved.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS

Multiplier and shift device using signed digit representation

InactiveUS7257609B1Consuming only a minimum area of semiconductor chip areaReduce in quantityComputation using non-contact making devicesDigital computer detailsFinite impulse responseSigned-digit representation
The present invention proposes a multiplier device performing multiplication of different powers of two serially in time (not in parallel) in order to further reduce the area needed for a hardware realization. By virtue thereof, it is enabled to use only one adder in connection with the multiplication which contributes to a reduced hardware amount and reduced required area for the hardware. A shifter means based on binary weighted shifting is used for shifting in connection with the multiplication, thereby reducing the required hardware amount (number of multiplexers and hardwired shifting elements) and thus reducing the area for hardware implementation still further. The present invention can be used in applications using digital multiplication, such as in digital signal processing DSP, digital filters and / or finite impulse response filters FIR filters as well as programmable and / or adaptive digital filters. As the multiplier is represented in CSD coding, the number of necessary shifting operations can be reduced and the number of necessary additions can be reduced, thus contributing to a reduced area needed for a hardware realization of a shifting means and a multiplier device on a silicon chip.
Owner:NOKIA SOLUTIONS & NETWORKS OY

Manufacturing method of novel printed circuit board

The invention relates to a manufacturing method of a novel printed circuit board, which can form fine circuits and laminated interconnection based on the improved semi-additive process and the process of pore filling under pattern plating. The specific steps of the method are as follows: a) preparing a dielectric layer and laminating a conductive layer on the dielectric layer, thereby forming a substrate of a composite structure with the dielectric layer and the conductive layer; b) manufacturing conduction blind holes on the dielectric layer and the conductive layer; c) carrying out conduction treatment for the conductive layer and the walls of the conduction blind holes, thereby forming a seed layer; d) adhering a light-sensitive film to the surface of the substrate and forming a plated blocking layer on the substrate through pattern transfer; e) plating the substrate with the plated blocking layer, forming a conductor pattern, and filling the conduction blind holes through plating, thereby forming a solid conductive pole; f) removing the plated blocking layer; g) removing the exposed seed layer and the conductive layer below the seed layer, and reserving the conductor pattern and circuits formed through plating, thereby forming a circuit board; and h) repeating the steps from Step a) to Step g) on the circuit board, so as to realize the multi-layer superposition.
Owner:SHANGHAI MEADVILLE SCI & TECH
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