1900 results about "Peening" patented technology

Tungsten/polymer composites comprising tungsten powder, another metal powder having a high packing density, and organic binder have high density, good processibility and good malleability. Such composites are useful as lead replacements, particularly in the manufacture of shot.

The invention relates to a process for producing an ultra-thick plate and belongs to the field of rolling and producing an ultra-thick steel plate in the metallurgical industry. The invention mainly overcome the defect of producing the ultra-thick steel plate by a traditional model casting manufacturing blank and an electro-slag remelting manufacturing blank. The method comprises the following steps: cutting and fixing lengths of the blanks, mechanically conditioning the blanks (eliminating, leveling and cleaning a single-surface oxide layer of a casting blank with a milling machine, a planer or a shot blast); clamping an assembly (relatively superposing the cleaning surfaces of the two blanks after processing, placing the two blanks oppositely and clamping the blanks); mounting the blanks in a vacuum chamber of an electronic beam welding machine for purpose of vacuuming; sewing the assembly on the electronic beam welding seal edge, heating the assembly in a furnace and rolling the assembly through temperature control; and then producing the ultra-thick steel plate. Compared with the traditional electro-slag remelting production process, the process has the advantages of high production efficiency, reduced electric power consumption, less investment of production devices and low production cost. Compared with the traditional die casting production process, the process solves the problem of segregation and looseness of a large-scale die casting ingot center part; the finished product ratio is high; and the finished product ratio of blank assembly is over 90 %.

A laser shock peening process for producing one or more compressive residual stress regions in a medical device is disclosed. A high-energy laser apparatus can be utilized to direct an intense laser beam through a confining medium and onto the target surface of a workpiece. An absorption overlay disposed on the target surface of the workpiece absorbs the laser beam, inducing a pressure shock wave that forms a compressive residual stress region deep within the workpiece. Medical devices such as stents, guidewires, catheters, and the like having one or more of these compressive residual stress regions are also disclosed.

The invention discloses a multi-point forming method for a whole aluminum alloy wall plate of an aircraft. The multi-point forming method comprises the following steps of arranging the whole aluminum alloy wall plate with ribs between an upper multi-point die and a lower multi-point die of a quick reconstructing die surface, filling a filling material between the ribs, arranging an elastic cushion between the wall plate and the multi-point die, and gradually forming a whole aluminum alloy wall plate part with ribs by a die pressing method along a controllable deformation path. The multi-point forming method has the advantages that by utilizing the quick and adjustable characteristic of the reconstructing multi-point die surface, the wall plate parts with different geometric shapes and double curvatures can be processed by one set of equipment; compared with the traditional rolling and bending forming method and the pressing and bending forming method, the stress of the wall plate is uniform, and the forming quality can be guaranteed; compared with the shot peen forming method and the aging forming method, the deformation amount is large, and the forming efficiency is high; the method can be used for forming the whole aircraft wall plate with different rib structures and the double curvatures, the problems of large size and high rib in the whole wall plate forming process are solved, and the method can be applied to the manufacturing of other large ribbed curvature parts of aircrafts, rockets and the like.

Methods for repairing nickel based alloy articles such as gas turbine rotors generally includes a removing a damaged portion of the articles and laser cladding a high temperature nickel based alloy powder thereto to form a solid layer. The process can be repeated until a desired thickness is obtained. Optionally, a peening process subsequent to laser cladding can be implemented to introduce compressive stress to the solid layer formed by laser cladding.

A method for producing a prosthetic having metal articulating surfaces is disclosed. The method includes impinging at least a portion of the articulating surface with high energy laser electromagnetic radiation, to form a lasershot peened surface. A hardened portion of the surface is then post-processed to form a layer having a predetermined finish.

Shot for use in a peening installation, the shot having: hardness greater than or equal to 800 HV;

density greater than or equal to 8 g/cm³; and pieces having a maximum dimension less than or equal to 1.5 mm.

The invention discloses a manufacturing method of an integral herringbone gear shaft, which comprises the following steps that: material preparation: a center hole is drilled on one end of a work piece; primary machining; primary detection; heat treatment; secondary machining; secondary detection; rough milling; chamfering at the gear end; coating anti-carburizing layers on both ends of the herringbone gear shaft so that the depth of a carburized layer is 3.55 to 3.95mm, and quenching so as to enable the hardness of a gear part to reach HRC58 to 62, and to enable the hardness of the heart to reach HRC28 to 33; carrying out shoot peening on a gear surface; tertiary machining; gear shaping; external grinding; fine milling; and inspection. The manufacturing method of the integral herringbone gear shaft has the advantages of improving the bending strength of the gear root, reducing the manufacturing cost and improving the manufacturing precision.

An environmental coating suitable for use on turbine components, such as turbine disks and turbine seal elements, formed of alloys susceptible to oxidation and hot corrosion. The environmental coating is predominantly a solid solution phase of nickel, iron, and/or cobalt. The coating contains about 18 weight percent to about 60 weight percent chromium, which ensures the formation of a protective chromia (Cr₂O₃) scale while also exhibiting high ductility. The coating may further contain up to about 8 weight percent aluminum, as well as other optional additives. The environmental coating is preferably sufficiently thin and ductile to enable compressive stresses to be induced in the underlying substrate through shot peening without cracking the coating.

A method for preparing calibration test sample of X ray stress measurement includes removing phenomenon of crystal particle coarsening and crystal face preferred orientation, carrying out short blasting treatment for semiproduct of the sample, stripping layer by layer for portion with greater stress gradient by electrochemical corrosion, carrying out X ray stress measurement and calibrating out work surface of the sample by utilizing relation curve of stress to layer depth.

Articles of bulk-solidifying amorphous alloys with improved durability and fatigue resistance, and more specifically articles of bulk-solidifying amorphous alloys subjected to a surface treatment, such as shot-peening, which creates deformations in the exterior surface, and methods of improving the durability and fatigue resistance of bulk-solidifying amorphous alloys using a surface treatment, such as shot-peening.

The invention relates to a crack-controlling method of metal parts by laser melting formation in laser material processing domain, which comprises closed-loop control of fused bath temperature, which comprises the two specific steps of exerting closed-loop feedback control on fused bath temperature by using optical imaging system and PID control device with calorific radiation transmitted from melting zone and adjusting horsepower of laser, and introduction of ultrasonic vibration, which comprises the specific steps of introducing ultrasonic vibration under the piece of work when forming by laser melting. The invention can deduce residual stress and crack, improve structure and can be used in multiple relative domains such as forming, manding and surface peening by laser melting.

The present invention relates to a roller cone drill bit that includes a bit body adapted to be rotated about a longitudinal axis, where the bit body has at least one leg depending therefrom, wherein the leg comprises a treated portion that provides a residual compressive stress, and a roller cone rotatably mounted on a journal. The treated portion treatment may comprise one selected from shot peening, laser-shock peening, and hammer peening. Further, the present invention relates to a method of manufacturing a roller cone drill bit that includes inducing a compressive stress, through plastic deformation, in at least a portion of at least one leg depending from a bit body. The inducing a compressive stress may comprise one selected from shot peening, laser-shock peening, and hammer peening.

The present invention: provides a steel material that withstands bending work after blasting or the like and has weather resistance while securing an ultra-high strength of 700 MPa or higher in terms of yield strength, and a method for producing said steel sheet; and is a weather-resistant high strength steel sheet excellent in bendability, said steel sheet containing, in mass, C: 0.05 to 0.15%, Si: 0.5% or less, Mn: 0.5 to 2.0%, p: 0.02% or less, S: 0.005% or less, Ni: 0.2 to 2.0%, Cu: 0.2 to 0.5%, and Cr: 0.2 to 1.0%, and one or more of Ti: 0.03 to 0.2%, Nb: 0.01 to 0.07%, V: 0.01 to 0.07%, and B: 0.0005 to 0.0050%, with the balance consisting of Fe and unavoidable impurities, and being produced by heating it to a temperature of 1,200 DEG C or higher, thereafter finish-rolling it in the temperature range from 850 DEG C to 950 DEG C, and coiling it in the temperature range from 500 DEG C to 650 DEG C. <IMAGE>

The invention relates to a method for eliminating residual stress in welding by ultrasonic peening and use thereof. The method is implemented mainly by using an ultrasonic peening device which comprises an ultrasonic wave generator, an acoustic system and a machine frame, wherein the ultrasonic wave generator and the acoustic system are arranged on the machine frame; the acoustic system has an energy transducer; the ultrasonic wave generator converts 50Hz power frequency alternating current power in a grid into ultrasonic frequency 20kHz alternating current power for exciting the energy transducer of the acoustic system; and the energy transducer of the acoustic system converts electric energy into mechanical vibration at the same frequency and transmits the ultrasonic frequency mechanical vibration to a weld joint in a workpiece at the temperature of 400 to 800 DEG C, so that a deep enough plastic deformation is formed on the surface of the weld joint part. The method which adopts a simple process has high-efficiency, energy-saving and environmentally-friendly characteristics and other characteristics in the elimination of the residual stress generated in a repair and welding process of a cast steel piece such as a swing bolster and a side frame. In addition, the method improves the stress distribution and fatigue strength of the weld joint.

The present invention relates to a device in the technical field of material processing, in particular to a peener which carries out the surface deformation strengthening process on magnesium alloy samples. The present invention comprises a main peening system, an upper whirlwind separation system, a dedusting system, an air compression system and an electric system, wherein, the upper whirlwind separation system is positioned on the upper end of the main peening system, the lower part of the upper whirlwind separation system is communicated with the main peening system, the upper part is connected with the dedusting system, which is positioned outside the main peening system, the air inlets of both the dedusting system and the main peening system are connected with the air compression system, and the electric system is connected with the main peening system, the upper whirlwind separation system, the dedusting system and the air compression system. The present invention can conveniently assemble and disassemble the samples of the shaft class, the range of the generated peening strenghth is wide, the effect and uniformity of peening is good, and moreover, pollution can be prevented.

A method and apparatus for improving the properties of a material of a workpiece by laser shock peening in which an overlay which is opaque to a laser beam, and an overlay which is translucent to said laser beam, are applied to a surface of a workpiece. The translucent overlay being applied on top of and over the opaque overlay. A laser beam is then directed at the said surface to which the overlays have been applied to vaporize the opaque overlay and laser shock peen the surface of the workpiece to produce a region of compressive residual stress in said surface. The overlays and the laser beam being applied concurrently, in a single operation, as the surface of the workpiece is traversed so that as each point on the surface to be treated is traversed the opaque overlay, translucent overlay, and laser shock peening are applied sequentially to that point. The opaque overlay is preferably an ink layer which is applied by printing on the surface. The apparatus, which in particular is arranged for carrying out this method, comprises the means for applying the overlays and for directing the laser beam at the surface all mounted upon a common tool head.

A pre-stressing and grit-blasting technique for shaping a double-curvature plate wall used as the thick jacket of large airplane features that a pre-stressing fixture unit is used to pre-bend a plate longitudinally and transversely and fix it for applying a pre-stress to it while the grits are blasted onto said plate for obtaining a needed shape.