55 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.

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.

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.