52results about How to "Maintain dimensional accuracy" patented technology

An inner peripheral edge of a toroidal glass substrate for a magnetic disk is subjected to mechanical polishing in such a manner that the surface roughness is no greater than 9 nm in terms of Rmax. Then, the inner peripheral edge is subjected to chemical polishing to remove at least 2 μm of a surface layer. The inner peripheral edge has a non-conventional mirror-finished surface obtained by mechanical polishing. Thus, sufficient ring strength is obtained even when the chemical polishing depth is smaller than in the past. A polishing depth of less than 5 μm is sufficient.

A fluid dynamic bearing (1) with a rotating shaft (3) inserted into a sleeve (2) fitted into a case (7) is disclosed. Tree rotating shaft (3) rotates freely without contact with the sleeve (2) by means of dynamic pressure force generated by the lubricant fluid that fills the gap formed around the rotating shaft (3). An adhesive groove (2c) is formed around the entire outer circumferential surface of the sleeve (2). At least one hole (7a) facing the adhesive groove (2c) is formed in case (7), and case (7) and sleeve (2) are; adhered by the injection of an adhesive (13) into adhesive groove (2c) from the hole (7a). The fluid dynamic pressure bearing, manufactured in this manner provides a high-quality bearing that is easy to construct, that can be adapted to low-cost manufacturing, and that can maintain dimensional and structural accuracy and in which the case (7) and sleeve (2) can be reliably adhered together with the adhesive (13). Such bearing will maintain long-term airtightness of the joint between the sleeve (2) and the case (7) and prevent leakage of lubricant fluid during manufacture. The bearing can be used for a spindle and other compact motors for driving memory devices for magnetic discs and optical discs (such as a CD or a DVD), motors for polygon mirrors used for scanning processes of laser beam printers, and for small motors for use such as in axial flow fans.

In a fuel injection valve, an adjustment pipe made of stainless steel and for adjusting a compression amount of a spring biasing a valve member is press-fitted into a cylindrical housing made of stainless steel, and a fuel injection amount is adjusted by adjusting a spring force of the spring in accordance with a press-fitted amount of the adjustment pipe. The adjustment pipe is immersed in an oxalic acid solution so that an oxalate film is formed thereon before being press-fitted into the cylindrical housing. Therefore, the oxalate film prevents a direct press-contact between an outer peripheral surface of the adjustment pipe and an inner peripheral surface of the cylindrical housing.

The sewing machine of the present invention has a needle bar crank linked to a main shaft, a vertical movement transmission mechanism linked to the needle bar crank, and a needle swing mechanism for swinging the needle bar. The up and down movement transmission mechanism includes: a ring-shaped member having a space defined by a ring-shaped inner peripheral surface, through which the needle bar passes; and a pair of upper and lower needle bar frame members, which are fixed on the outside of the needle bar, and Arranged on the upper and lower sides of the ring member. The ring member is journally connected to the needle bar crank. A clearance for swinging is ensured between the annular inner peripheral surface of the space of the annular member and the outer periphery of the needle bar. The needle bar can swing without being in contact with the annular inner peripheral surface within the swing gap.

Disclosed is a tire vulcanizing apparatus including: upper and lower circular plates, to which sidewall dies for forming side portions of a tire are attached; respectively; and plural segments, to which tread dies separated as plural pieces for forming a tread portion of the tire are attached; respectively, in which apparatus, the upper and lower circular plates are held by engagement of lug portions, formed respectively on upper and lower portions of the segments, with protrusions on outer circumferential portions of the upper and lower circular plates so as to prevent the upper and lower circular plates from moving away from each other, the apparatus being constituted by providing adjustment plates, used for maintaining a measurement between the upper and lower circular plates, to an interface between the protrusion of each of the upper and lower circular plates and a corresponding one of the lug portions of each segment.

The invention relates to the field of the injection molding of transparent ceramics and ceramic powder, which discloses a degreasing method used for a transparent alumina ceramic injection molding product. The method comprises the following steps: firstly, injecting and molding a ceramic crude blank, wherein the assistant materials of the ceramic crude blank are alumina and an adhesive, and the adhesive comprises the following components by weight percent: 18-20% of polypropylene, 70-80% of paraffin and 1-12% of stearic acid; secondly, immersing the ceramic crude blank in an extraction solvent and extracting for 3-4h at the temperature of 45-60 DEG C, wherein the extraction solvent is prepared by mixing 20-30% of alcohol by volume and 70-80% of normal heptane by volume; then, discharging the extraction solvent and drying the ceramic crude blank in the air at room temperature; and finally, burying the ceramic crude blank in alumina powder and carrying out thermal degreasing for 56-60h hot.

This specification describes techniques for manufacturing an electronic system module. The module includes flexible multi-layer interconnection circuits with trace widths as narrow as 5 microns or less. A glass panel manufacturing facility, similar to those employed for making liquid crystal display, LCD, panels is preferably used to fabricate the interconnection circuits. A multi-layer interconnection circuit is fabricated on the glass panel using a release layer. A special assembly layer is formed over the interconnection circuit comprising a thick dielectric layer with openings formed at input/output (I/O) pad locations. Solder paste is deposited in the openings using a squeegee to form wells filled with solder. IC chips are provided with gold stud bumps at I/O pad locations, and these bumps are inserted in the wells to form flip chip connections. The IC chips are tested and reworked. The same bump/well connections can be used to attach fine-pitch cables. Module packaging layers are provided for hermetic sealing and for electromagnetic shielding. A blade server or supercomputer embodiment is also described.

The invention relates to a motor rotor die-casting manufacturing process, in particular to a motor rotor casting groove wall cleaning device. The motor rotor die-casting manufacturing process comprises a base, an intermittent transposition mechanism, a clamping and positioning mechanism, a feeding mechanism, a shifting and positioning mechanism, a groove wall cleaning mechanism, a discharging mechanism and a grabbing and feeding mechanism. The device provided by the motor rotor die-casting manufacturing process is suitable for carrying out streamlined processing treatment on motor rotor laminations, the efficiency is greatly improved, the grinding quality uniformity is high, damage to the motor rotor laminations due to improper grinding can be avoided, the grinding quality is ensured, andthe size precision and the appearance attractiveness of the motor rotor laminations are maintained.

A nozzle plate includes: a plate substrate in which a nozzle is formed, ink being ejected through an ejection port of the nozzle in the plate substrate; and a p-type doped layer which forms a whole perimeter of an edge portion defining an inner perimeter of the ejection port of the nozzle in the plate substrate.

An inducer includes a hub having an inlet end and an outlet end. At least one full size blade has an inner edge is affixed to the hub and an outer edge. This full size blade extends rearwardly from the inlet end in a helical configuration. A partial shroud encloses a first length of the full size blade outer edge adjacent the inlet end. A second length of the full size blade outer edge that is adjacent to the outlet end is free of the partial shroud. It is within the scope of the disclosure to include short blades symmetrically offset from the two full size blades. These short blades have a short blade inner end affixed to the partial shroud and a short blade outer end extending from the partial shroud towards the hub, but terminating prior to reaching the hub.

A shaft includes: two large-diameter portions; and a small-diameter portion formed between the two large-diameter portions. A bearing includes: an annular body in which to insert the shaft; two bearing surfaces being opposite the large-diameter portions; and an intervening surface located between the two bearing surfaces on an inner circumferential surface of the body, and being opposite the small-diameter portion with a clearance formed between the intervening surface and the small-diameter portion. No anti-corrosion treatment is applied to the large-diameter portions. An anti-corrosion treatment is applied to at least any one of: an exposed portion of an outer peripheral surface of the body of the bearing, which is exposed to the outside of the housing; the intervening surface of the bearing; an opposite end surface of the bearing; and the small-diameter portion of the shaft.

The speed and control over layer thickness in multi-layer 3-D printing is enhanced when producing a sample layer by projecting an image of the layer from light engine onto an optically clear membrane in contact with a printing material to prepare a sample layer in contact with the membrane, followed by moving the sample away from the membrane to separate the two, then moving the sample back toward the membrane to a point where the distance between the membrane and sample, as measured by a laser displacement sensor, is equal to the thickness of the next layer. While the sample moves back toward the membrane a dual-roller spreader or rotary roller spreader oscillates on the membrane to simultaneously to drive away printing material and flatten the membrane. A bubble scrapper is employed to remove bubbles from the printing material as they form.

The invention discloses a method for repairing micro-contact fatigue damage of a tooth surface and a repairing device. The method comprises the following steps that a to-be-repaired gear is fixed on a motion platform through a clamp; geometrical morphology characteristics of a to-be-repaired area are measured by using a three-dimensional morphology instrument, collected information is input to a comprehensive control and monitoring system, and material and mechanical characteristics of the to-be-repaired gear are compared through a database to determine optimal laser shock repair process parameters; the optimal process parameters are imported into a pulse laser generator, the laser generator emits laser according to the optimal process parameter scheme, and laser beams are exported through a light path regulation and control system and a light path system; meanwhile, a water restraint layer system controls a water nozzle to form a water restraint layer on the tooth surface; and the laser acts on the to-be-repaired area on the tooth surface, so that the gear generates the required reinforced repair effect, and the purpose of repairing the tooth surface damage is achieved. The problems that in a traditional repairing mode, the process is complex, roughness is high, abrasion resistance is poor, and the gear can be repaired only after obvious defects or faults occur to the gear are solved.