54 results about "Autofrettage" patented technology

A connection head structure of a high pressure fuel injection tube is provided to avoid an interference between an annular flange and an opposing part by sufficiently maintaining an tube axial direction length of the connection head and to obtain a good sealability to prevent leaking during autofrettage processing with a high pressure of not less than 300 MPa. A connection head structure of a high pressure fuel injection tube includes, on a connection end portion of a thick walled fine steel tube, a spherical seat face, an annular flange, and a circular conic face that continuously extends from the seat face, wherein a washer and a fastening nut are assembled, characterized in that when a thick walled fine steel tube has t (wall thickness) / D (outer diameter)<0.3, an tube axial direction distance L1 from a connection head end to the back face of the annular flange is from 0.38 D to 0.7 D, a spherical body radius R of the seat face is from 0.45 D to 0.65 D, and an outer diameter D1 of the annular flange is from 1.2 D to 1.4 D, wherein an inner circumferential face of the connection head includes a two stage tapered face having a cross section outline in a tube axial direction of the steel tube that broadens toward the aperture of the tube.

A manufacturing method includes a first step of performing swage autofrettage on an object; a second step of heat soaking the object; and a third step of performing hydraulic autofrettage on the object. The second and third steps may be repeated one or more times. A final step may be heat soaking the object. The object may be, for example, a pressure vessel or gun barrel.

An inventive process is provided for creating residual compressive stress at a surface of a structure without resort to custom mandrels and dangerous high-pressure fluids. The inventive process yields autofrettage of a structure such as a tube, gun barrel and the like, the structure having an outer surface and an inner surface.

The present application relates to devices for the vitrification of biological samples, including embryos, oocytes and biological tissues. Suitably, the devices are automated devices which require little if any operator intervention or sample handling, thereby reducing contamination, improving success rates and increasing efficiency. Also provided are methods of vitrifying a biological sample, suitably using the disclosed devices.

The present invention relaters to a system and methods for automated vitrification of mammalian oocytes or embryos. The system and methods enable automated processing of oocytes or embryos in vitrification solutions; robotically moving vitrification devices that carry processed cells for freezing in liquid nitrogen; automated sealing of the frozen devices; and transferring the sealed devices to an automated storage system for long-term cryopreservation.

A common rail, in which a flow passage in a main pipe rail and portions of branch holes are improved in durability while the portions of branch holes are enhanced in fatigue strength for inner pressures, is provided. A common rail for diesel engines, comprising branch holes made in a main pipe rail having therein a flow passage in an axial direction, to be communicated to the flow passage, wherein stress concentration in the vicinity of the branch holes is relaxed, and then a whole inner peripheral surface of the main pipe rail and the branch holes are subjected to autofrettage processing.

A common-rail injection system is provided for a diesel engine and has excellent internal pressure fatigue resisting characteristics, vibrational fatigue resisting characteristics and cavitation resisting property and sheet face flawing resisting property, and can be made thin and light in weight. A main pipe rail is manufactured by transformation induced plastic type strength steel. After the main pipe rail is processed, residual austenite is generated by heat treatment, and the reduction processing of stress concentration of a branch hole and a main pipe rail side flow passage crossing portion is performed. Further, it is preferable that an induced plastic transformation is generated on the inner surface of the main pipe rail by autofrettage processing, and compression residual stress is left.

The invention discloses a novel liquid-expansion molding device and a liquid-expansion molding process. The novel liquid-expansion molding device comprises an autofrettage pressure mould and a floating pressure mould. The autofrettage pressure mould is provided with a molding cavity; a through hole matched with the molding cavity is formed in the middle of the floating pressure mould which is mounted in a liquid-expansion pressure cavity; the edges of a plate to be molded are pressed by the adjoining plane of the floating pressure mould and the autofrettage pressure mould which is connected with a press machine; the liquid-expansion pressure cavity is connected with high-pressure liquid; in the molding process, the press machine is used for pressing and sealing the edges of the plate to be molded, and the high-pressure liquid is input into the liquid-expansion pressure cavity and acts on the plate to be molded, so that the plate to be molded deforms toward the molding cavity of the autofrettage pressure mould and is molded. The structures of the liquid-expansion molding moulds can achieve liquid-expansion molding of the plate, and the structure of the novel liquid-expansion molding device can also be conveniently used for liquid-expansion molding of the plate. The process is simple, requirements for the moulds are low, and the precision of molding can also be improved. Further, the structure can reduce the work load of the press machine, the work pressure of the press machine is reduced at the same time, and use requirements are lowered.

An inventive process is provided for creating residual compressive stress at a surface of a structure without resort to custom mandrels and dangerous high-pressure fluids. The inventive process yields autofrettage of a structure such as a tube, gun barrel and the like, the structure having an outer surface and an inner surface.

A manufacturing method for a high pressure tank includes preparing a liner including a cylindrical body portion and a pair of side end portions, forming a reinforcing layer by winding fiber-reinforcedresin around an outer peripheral surface of the liner, carrying out shot peening by shooting a shot material towards an inner periphery region of a boundary between the body portion and each of the side end portions, and carrying out autofrettage after the reinforcing layer is formed and the shot peening is carried out. The autofrettage is carried out by applying internal pressure to the liner such that the liner is plastically deformed and then eliminating the internal pressure such that compression stress is applied to the liner.

The invention relates to a manufacturing method in the oil pipe processing field, in particular to a process for preparation of a supercritical heat insulated oil tube. The technical proposal is that the invention comprises material selecting and preprocessing of an inner tube and an outer tube, welding wires for nesting and welding are flux-cored wires, protective gas for welding is the mixture gas of argon gas and argon gas, autofrettage is done after being welded and heat preservation for a certain time, the control thermal conductivity factor of X-ray flaw on-line detection, heating vaccum pumping, vacuum blocking welding, and magnaflux inspection are 0.01W / m DEG C to 0.04 W / m DEG C, and normal temperature anti-inner pressure test pressure of screw cutting on two ends, coating sealinggrease for mounting sealing ring, an upper coupling, a path, and an integral test are more than 40MPa, a normal temperature anti-external crowded test pressure is more than 45MPa, and the invention also comprises an upper screw thread protector. Modification and tackling of the invention are from material selecting and technological condition to improve performance indicating of the insulated oiltube, the invention can satisfy steam injection pressure 26MPa, steam injection temperature 400 DEG C, the downhole depth can achieve a behavior with 2300m through process combination.