244results about How to "Precise Dimensions" patented technology

A manufacturing method of electronic components includes forming a first insulation layer on a substrate, forming a plurality of passive elements on the first insulation layer, forming a second insulation layer on the passive elements, forming a plurality of conductor layers electrically connected to the respective passive elements, on the outer side of the second insulation layer to be exposed to an upper surface of each electronic component, and forming grooves between the electronic components including the respective passive elements to expose side surfaces of each electronic component and parts of the conductor layers from the side surfaces of each electronic component. The manufacturing method further including plating a plurality of external electrodes on the respective conductor layers exposed to the upper surface and the side surfaces of each electronic component, and cutting the substrate to completely separate into individual electronic components.

A microfabricated ion trap array, comprising a plurality of ion traps having an inner radius of order one micron, can be fabricated using surface micromachining techniques and materials known to the integrated circuits manufacturing and microelectromechanical systems industries. Micromachining methods enable batch fabrication, reduced manufacturing costs, dimensional and positional precision, and monolithic integration of massive arrays of ion traps with microscale ion generation and detection devices. Massive arraying enables the microscale ion traps to retain the resolution, sensitivity, and mass range advantages necessary for high chemical selectivity. The reduced electrode voltage enables integration of the microfabricated ion trap array with on-chip circuit-based rf operation and detection electronics (i.e., cell phone electronics). Therefore, the full performance advantages of the microfabricated ion trap array can be realized in truly field portable, handheld microanalysis systems.

The present invention relates to a polymer powder which comprises polyamide, and to the use of this powder for shaping processes, and also to moldings produced from this polymer powder. The shaping processes are layer-by-layer processes which use powders, where regions of the respective layer are selectively melted via introduction of electromagnetic energy. The selectivity may be achieved, with no intention of restricting the invention thereto, be achieved via masks, application of inhibitors, of absorbers, or of susceptors, or via focusing of the energy introduced. After cooling, the regions then solidified can be removed in the form of moldings from the powder bed.

A display device includes a pair of glass substrates. On the side of each of the pair of glass substrates, a press mark is formed between a first end of each of the pair of glass substrates and a position at least 0.3 mm but no more than 3 mm away from the first end, another press mark is formed between a second end of each of the pair of glass substrates and a position at least 0.3 mm but no more than 3 mm away from the second end, a scribing groove having a predetermined scribing amount is formed between the press marks, and there are rib marks in the scribing groove.

A shaping tool as depicted in exemplary FIG. 3 comprising a rotatable base member having at least one profiled bending roller (13) which is mounted on a circular track and is rotatable about a rotation axis. The bending roller (13) arranged on a radially movable slide (11) is movable from a position defining a maximum working aperture for the tool, by means of a spring-loaded lever (9) which has an axial configuration, into a position defining a minimum working aperture for the tool.

The present invention provides a precise casting technology for a green sand vacuum sealing model, which belongs the vacuum casting technical field. The invention is characterized in that the green sand is taken as a molding material, quantity of the sand core can be minimized through an effective usage of foamed materials, which is suitable for producing medium and small sized comparative precision castings. The problems of serious dust pollution, long vacuum-pumping time and production efficiency affected by using paint in a present V method can be solved. When a complex cavity is casted, the foamed material is provided at the position unsuitable for drafting to form a portion of the cavity, the foamed material is melted when casting, therefore the purposes of minimizing sand core quantity and weight can be reached, so that the production technology can be simplified as well as cost can be saved. The produced casting has the advantages of high dimensional precision, clear contour and smooth surface.

A manufacturing method of a steel structure box girder comprises steps as follows: 1), a computer is used for controlling sizes of a cover plate, webs, lining plates of the webs, a baffle and a lining plate of the baffle for blanking; 2), spot welding lining plates are assembled on back surfaces of grooves of the webs and the baffle respectively; 3), a bottom plate and the two webs are assembled into a U shape and welded on a box girder mould; 4), the baffle is placed and welded in a U-shaped groove; 5), the cover plate is assembled and welded on the U-shaped groove; and 6), the steel box girder is subjected to shot blasting and paint spraying, and paint adopts anticorrosive paint and comprises a component A and a component B. According to the steel structure box girder manufactured with the method, materials are saved, the production efficiency is improved, the integrally formed anticorrosive paint is corrosion-resistant and wear-resistant, and the requirement for inner wall coating of the steel structure box girder is met.

A reciprocal bi-directional table saw including a cutting table and a deck to secure a work piece in place; the table including a horizontally provided runway and a cutting process unit that automatically travels back and forth on the runway; an automatic travel device being each provided on both sides of a seat plate provided to the cutting process unit; a saw blade elevates as controlled by a plunger having one side pivoted to the seat plate; a circular saw blade and a device to drive the circular saw blade being provided on the saw blade holder for the table saw to reciprocally execute the cutting on the work piece to achieve precise process of the work piece and upgrade the production rate.

According to the invention there is provided a composite door including a first and a second door skin, each door skin having an interior and an exterior surface, in which the interior surface of at least the first door skin has one or more bosses formed therein for receiving a fastening element.

In a connection assembly (15) of printed-circuit board and connector, a printed-circuit board (16) and a connector (17) can be fixed positionally accurately in relation to one another by means of position holders (36, 37) provided on the connector (17). The position holders are constituted of soldering pins (36, 37) and the printed-circuit board (16) is provided with soldering pads (46, 47) which can be connected to the opposing soldering pins (36, 37) by soldering. There is provided in this manner a connection assembly (15) of printed-circuit board and connector in which the positionally accurate fixing of a printed-circuit board (16) and a connector (17) is more easily produced and more precisely assembled than has been possible to date.

A method for producing a device with at least one suspended membrane, comprising at least the following steps:

• • producing a trench through a first sacrificial layer and a second layer deposited on the first sacrificial layer, the trench completely surrounding at least a portion of the first sacrificial layer and at least a portion of the second layer,
  • filling all or a portion of the trench with at least one material capable of resisting at least one etching agent,
  • etching said portion of the first sacrificial layer with said etching agent through at least one opening made in the second layer,
  • said portion of the second layer forming at least one portion of the suspended membrane.

In a spindle motor, a capillary seal portion having a radial dimension that decreases in an axially downward direction, and a labyrinth seal portion arranged above the capillary seal portion are defined between an outer circumferential surface of a rotating member and an inner circumferential surface of a tubular portion. The capillary seal portion includes a liquid surface of a lubricating oil positioned therewithin. The radial dimension of the labyrinth seal portion is smaller than the radial dimension of an upper end portion of the capillary seal portion, so that the labyrinth seal portion contributes to reducing evaporation of the lubricating oil.

The invention discloses a technology for machining a lens cone plastic-mould precise assembly of a digital camera. The technology comprises the following steps of numerical control turning, milling machining and tapping, thermal treatment, outer surface grinding, linear cutting, grinding matching, excircle grinding, machining of a numerical control machining center, electric spark forming and machining, linear cutting and electric spark machining and ejection and product detection. The technology for machining the lens cone plastic-mould precise assembly of the digital camera is novel in design, convenient to implement and precise in part size, the machining cost and the time are saved, and the production efficiency is improved.

The invention relates to a manufacturing method for double-twist arc box structure, belonging to the steel structure field, comprising material cutting aided by computer, cutting, fabricating for clamping fixture of box-sectioned beam and assembly of box-sectioned beam so on. The method makes use of computer to assisted lofting, cutting, designing for space clamping fixture and assembling for space clamping fixture. It can solve the problem very well that when material cutting of complicated-component spiral box structure is carried out in fabrication of metal structure, the dimension of material cutting is not accurate and assembly is not easy. Component with relative accurate figuration dimension is fabricated. It takes a higher guiding role for fabrication of similar engineering in future.

The invention discloses a method for preparing a silicon carbide porous ceramics filtering element and squeezing equipment. The method comprises slurry preparing, forming, drying and baking, and the method is characterized by comprising the following steps: mixing silicon carbide powder of which the granularity is smaller than 200 mu m, ceramics binding agent, pore forming agent and plasticity agent according to certain proportion into a pug mill to prepare porous ceramics plasticity slurry; squeezing the porous ceramics plasticity slurry to obtain a silicon carbide porous ceramics plastic tube; filling the tube in the squeezing equipment; pressurizing two ends of the tube to form a flange at one end of the silicon carbide porous ceramics plastic tube, and to form an end enclosure at the other end; removing the die, drying to obtain silicon carbide porous ceramics filtering unit blank; and baking at certain temperature to obtain the silicon carbide porous ceramics filtering element. The silicon carbide porous ceramics filtering element has the advantages of high intensity, uniform pore diameter, high porosity, higher filtering precision and filtering efficiency, high temperature resistance, easy regeneration and repeated use, and is suitable for industrial bulk production.

The invention relates to a casting tool for the production of castings, particularly for the production of cores (90) for sand castings, comprising a supporting device consisting of a first and a second supporting unit (10, 20, 50, 60) capable of being moved in a joining direction (2) toward each other, and comprising at least two mold elements (30, 40), of which a first mold element (30) is attached to the first supporting unit (10, 20) and a second mold element (40) is secured to the second supporting unit (50, 60), which mold elements (30, 40) each have a mold recess (33, 43), which mold recesses (33, 43) in the mold elements (30, 40) together define the shape of at least one casting core to be produced (90) when the first and second mold elements (30, 40) bear against each other.

According to the present invention, one of the supporting units (10, 20) has a first peripheral frame (20) that surrounds the mold element (30) attached to said supporting unit (10, 20), and the frame (20), as multi-segment frame, is composed of at least two frame segments (22, 24, 26) joined together by positively effective securing means.

The use thereof as a very simply and quickly produced core-casting tool.

The invention discloses a hot isostatic pressure near-net forming method for a semi-solid complex difficult-machining compact piece. The hot isostatic pressure near-net forming method comprises the steps that a semi-solid material is used as a forming material, graphite is used as an internal form control core, the hot isostatic pressure temperature is selected as the solid-liquid two-phase interval temperature, and the compact piece in a complex shape is directly formed under coupling of temperature and pressure. According to the hot isostatic pressure near-net forming method for the semi-solid complex difficult-machining compact piece, performance defects caused by powder surface pollutants in traditional methods can be effectively overcome, and the part forming precision can be effectively ensured through high pressure at the high temperature; in addition, the temperature close to the melting point of an alloy material is adopted, and a solid-liquid coexisting phase occurs in a ladle sleeve at the temperature; due to the fact that liquid phase components exist among crystal grains or solid phase particles, the solid phase particles almost have no binding force and are very low in flow deformation resistance, and a complex runner in the form control core is filled with parent metal advantageously; and moreover, the solid phase particles are easy to separate on specification portions, and while, due to the fact that the liquid phase components exist, the separated portions are very easy to connect integrally.

The invention relates to a U-shaped bending die with a shaping function. The U-shaped bending die comprises an upper die base, a male die, a lower die base, female dies, wedges, a top plate and guide rods. The male die is fixedly connected with the upper die base through screws, the lower die base is provided with a working groove, the two symmetrical female dies and the two symmetrical wedges are arranged in the working groove, the wedges are located on the outer sides of the female dies, the female dies make contact with the inclined planes of the wedges, the lower die base is provided with kidney-shaped grooves, each female die is provided with a round pin, and each round pin is constrained in the corresponding kidney-shaped groove. The two sides of the lower die base are each provided with a screw rod, each screw rod stretches into the corresponding wedge in the working groove from the outside of the lower die base, the top plate is arranged between the female dies, the guide rods are arranged on the lower surface of the top plate, and the guide rods extend downwards, penetrate through the lower die base and stretch out of the lower die base. The U-shaped bending die is simple and reasonable in structure and convenient to operate; after the male die is pressed downwards to obtain a U-shaped stamped part, the wedges are pushed by rotating the screw rods, the female dies are pushed by the inclined planes to shape the U-shaped stamped part, and a U-shaped part accurate in boundary dimension is obtained.