69results about How to "Large plastic deformation" patented technology

The invention relates to a system for repairing a heart valve comprising a catheter, said catheter comprising an engagement member, the engagement member having at its distal end a hook capable of engaging with the surface of a prolapsed heart valve leaflet; and a fastener capable of deploying a fastening means to said leaflet.

The invention provides an ultrasonic and micro-forging composite device for improving the microstructure and performance of additively manufactured metal and an additive manufacturing method. The ultrasonic and micro-forging composite device comprises an energy converter, a pneumatic slider, a pneumatic slider connection frame, an amplitude transformer, a tool head and a roller. The energy converter is arranged in an energy converter shell, the energy converter shell is provided with an inserting piece and a pipeline connector, the amplitude transformer is connected to the lower end of the energy converter, the tool head is connected below the energy converter, the roller is located between the tool head and a workpiece, and the pneumatic slider is connected with the energy converter shell and the amplitude transformer through the pneumatic slider connection frame. By means of the ultrasonic and micro-forging composite device, the advantages that ultrasonic impact frequency is high and deformation generated by mechanical rolling is large are combined, the composite effect of ultrasonic impact and continuous rolling micro-forging can be achieved, and the purpose of improving the microstructure of the additively manufactured metal and the mechanical performance of parts is achieved. Through organic combination of the ultrasonic and micro-forging composite device and the additive manufacturing method with an existing additive manufacturing technology, the technical bottleneck that structure control is easy while performance control is difficult in existing metal additive manufacturing is solved, and innovation and development of metal rapid forming and manufacturing technologies are induced.

The invention discloses an electromagnetic vibrating, stirring and friction-welding stirring-head and a corresponding welding method thereof. An electromagnetic vibrating device is adopted to assist electromagnetic vibration during the process of stirring, and friction-welding to lead the stirring-head to vibrate at high frequency simultaneously when the stirring-head rotates at a high speed to transfer energy to the metals in a stirring and friction area so as to lead the metals to achieve plastic state more quickly; the thermoplastic metals receive the composite effects of a friction force and the high-frequency vibrating energy during the rotating process of a stirring needle, thus being capable of effectively improving the velocity of the thermoplastic metal flow, improving the forming efficiency and quality of welding seams and being more effectively used for the welding and processing of high-melting point materials and thick boards.

The invention relates to a method for preparing a semisolid blank, utilizes an improved SIMA (strain induced melt activation) method to prepare the semisolid blank, and belongs to the technical field of metal semisolid blank. The method comprises the following steps of: firstly, measuring a liquid solid phase line point of the semisolid alloy to be prepared, then, heating an alloy blank so as to carry out asynchronization multitrack rolling or pillar squeezing transformation, finally, remelting, and carrying out heat preservation for a long time so as to obtain the required semisolid blank. The asynchronization rolling or pillar squeezing transformation is capable of generating large deformation amount, group bough crystal formed in the blank is destroyed, the asynchronization rolling is utilized to replace pre-deformation processes such as the existing upset, compression, equal diameter angle compression, and the semisolid blank is prepared and has the advantages of uniform formation, high nodularity, and accurate control solid phase rate.

The invention discloses a manufacturing process for a high-strength corrosion-resistant aluminum alloy forged piece. The process comprises the following steps of material preparation, heating, multi-axial forging, mechanical machining, heating, trestle bearizing, heating, ring rolling, mechanical machining, annealing, solid-solution water-quenching, cold pressing deformation, aging and the like. The aging treatment method comprises the steps of first-grade aging, specifically, a ring forged piece subjected to cold pressing is put into a furnace at the room temperature and heated to 90-110 DEGC, heat preservation is performed for 1-3 hours, and air cooling is performed; second-grade aging, specifically, the ring forged piece is put into the furnace when the temperature is reached, heat preservation is performed for 4-8 hours at the temperature of 150-160 DEG C, and air cooling is performed after aging is ended.

The invention relates to the field of the preparation of semi-solid slurry, in particular to a method for preparing semi-solid slurry by a new strain induced melt activation (SIMA) method. By the method, the problem of quality defects during the preparation of the semi-solid slurry in the prior art is solved. The method comprises the following steps of: heating an alloy to above the recrystallization temperature according to liquidus and solidus points of a semi-solid slurry alloy to be prepared; drawing out and upsetting the alloy for multiple times by utilizing a cogging forging process; and heating the alloy to a semi-solid temperature interval to prepare the semi-solid slurry with a certain solid-phase rate. By the method, the semi-solid slurry of multiple alloys can be prepared, so the method has the advantages of simplicity of operation, convenience for control, high nodulizing rate, accurate control of the solid-phase rate and the like.

The invention relates to an electric device (1) for interdental cleaning and for treating teeth and gingivae comprising a casing (2) containing an eccentric mass (23) which is driven by an electric motor (22) and whose vibrations are transmitted to a tool holding fixture (5). A coupling area (A, B) for the tool holding fixture is connectable to a coupling area (34, 38) of a mouth cavity treating tool such as an interdental cleaner (31), a dental floss holder (37), friction and polishing discs, etc by means of connecting means. According to said invention, the tool holding fixture (5) consists of a pivot-shaped segment (48) and a coupling area (B) formed on the free front end face (61) of said segment, wherein said coupling area (B) is embodied in the form of a polygonal, preferably rectangular, reception orifice (26) in which the coupling area (34) of the tool (31) can be formed by plastic deformation. A toothpick (31) and a dental floss holder (37) are also disclosed. Said invention makes it possible to carry out a particularly soft interdental cleaning.

The invention provides a copper thin material ultrasonic spot welding connecting method. When ultrasonic spot welding connection is carried out on copper thin materials, nano-copper particles with a thickness of 2-50 [Mu]m are added between copper thin materials; and when the nano-copper particles are added between the copper thin materials for ultrasonic spot welding connection, the welding timeis 0.2-1.6 s, the welding pressure is 20-70 psi and the welding amplitude is 20-65 [Mu]m. According to the copper thin material ultrasonic spot welding connecting method, the nano-copper particles areadopted as an interlayer to solve the problem in the ultrasonic spot welding connection process, in specific, in the previous research of copper thin material ultrasonic spot welding, the problem that the effective thickness of a welded joint is greatly reduced while increasing the bonded area of welding interfaces is solved; and with adoption of the copper thin material ultrasonic spot welding connecting method, the purpose of increasing the bonded area of ultrasonic spot welding interfaces without reducing the effective thickness of the welded joint is realized, so that the purpose of improving the mechanical property of the ultrasonic spot welded joint is realized.

A pipe connection arrangement for the connection of pipelines, in particular of motor vehicle pipelines to a connection element, wherein a connection fitting is provided which encompasses the pipeline to be connected in the region of one of its pipeline ends and which, with a front side press surface of a of a rear side surface facing a flange connected to the pipeline end. The flange exhibits a sealing surface on its front side, wherein the sealing surface can be pressed by means of an axial movement of the connection fitting to a contact surface of the connection element or to a second sealing surface of a second flange of a second pipeline, wherein a stop element is arranged between the contact fitting and contact surface of the connection element and wherein this stop element limits or interrupts the axial movement of the connection fitting.

The invention discloses an assembled frame structure beam-column energy-consumption connecting key. End plates include the first end plate and the second end plate which are parallel to each other inthe vertical direction; the first end plate and the second end plate are detachably fixed to a frame concrete beam and a frame concrete column correspondingly; steel tube concrete connectors are perpendicularly fixedly arranged between the first end plate and the second end plate; the steel tube concrete connectors include the first steel tube concrete connector and the second steel tube concreteconnector which are parallel to each other in vertical direction; webs are vertically disposed between the first steel tube concrete connector and the second steel tube concrete connector; and the webs are perpendicularly welded and fixed to the steel tube concrete connectors and the end plates. The two steel tube concrete connectors and the webs are arranged between end plates, and then the energy-consumption connecting key is formed; the end plates and the steel tube concrete are combined to form the connecting key so as to improve the bearing force as much as possible, the steel tube concrete has high plastic deformation and energy-consumption property after yielding; and the end plates are detachably fixedly connected to the frame concrete beam and column, and timely replacement and repair of the energy-consumption connecting key are guaranteed.

Provided is a resistance spot welding method that inhibits, in accordance with the degree of axis misalignment between electrodes, the occurrence of cracking in a weld regardless of the steel grade. In resistance spot welding methods according to the present invention, H (ms) is an electrode force retaining time after completion of current passage, D (mm) is an amount of axis misalignment between the electrodes, t (mm) is a total sum of sheet thicknesses of a plurality of overlapping steel sheets, T (MPa) is a tensile strength of a steel sheet having a highest tensile strength among the plurality of steel sheets, F (N) is an electrode force, and d (mm) is a tip diameter of one electrode of the pair of electrodes that has a smaller tip diameter. The electrode force retaining time H is specified to be a predetermined value or greater.

The invention relates to a honeycomb sandwich composite material with high-speed impact resistance and wave-absorbing stealth functions and a preparation method of the honeycomb sandwich composite material. The honeycomb sandwich composite material is formed by compounding a wave-transparent layer, a wave-absorbing layer and a reflecting layer in sequence, the wave-transparent layer is prepared from low-dielectric-constant continuous fiber cloth and low-dielectric-constant resin and can provide good impedance matching performance, so that incident electromagnetic waves can enter the material as much as possible; the middle wave-absorbing layer is a honeycomb filled with a mixture of pure shear thickening glue and wave-absorbing functional particles/shear thickening glue with a certain height ratio, and can endow the material with strong electromagnetic wave loss capability; and the bottom reflecting layer is made of a carbon fiber cloth reinforced resin matrix composite material, so that the electromagnetic waves which are not absorbed can be reflected and secondarily lost. According to the invention, the defects of difficulty in controlling the coating thickness, difficulty in ensuring the uniformity and the like in the process of coating the wave-absorbing agent on the honeycomb wall can be solved.

The invention relates to an electric arc spraying method. The electric arc spraying method comprises the following steps that S1, construction preparation is conducted; S2, pretreatment is conducted on the surface to be sprayed, specifically, sand blasting treatment is conducted on the surface of a workpiece through pneumatically-controlled sand blasting equipment, and the roughness of the workpiece reaches 90-120 microns; S3, pretreatment is conducted on a metal wire, specifically, the metal wire is cleaned through a rust remover, straightened through a straightening machine after being cleaned and dried, and polished after being straightened, so that the surface of the metal wire is smooth; S4, electric arc spraying is conducted; S5, coating hole sealing is conducted; and S6, coating inspection is conducted, specifically, the appearance surface obtained after spraying is inspected. According to the electric arc spraying method, the metal wire is cleaned, dried, straightened and polished before spraying, so that the outer surface of the workpiece obtained after spraying is smooth, a coating is uniform, flat and compact, the coating and a base body are well combined, bubbling, cracking, pitted surfaces and peeling are avoided, and accordingly the corrosion resistance and structural strength of the workpiece are improved.

The invention discloses a copper alloy rheoforming method, and belongs to the technical field of metal semi-solid formation. The method comprises the steps of heating copper alloy in a vacuum or inert gas protecting atmosphere until reaching the temperature exceeding recrystallizing temperature under the liquid-solid temperature intervals of the copper ally; plastically forming; feeding the plastically-formed blank into a die of which the temperature is accurately controlled; heating to reach the semi-solid temperature interval; maintaining the temperature; directly extruding the heated blank, or performing die forging and other deformation; cooling by the air until reaching the room temperature; performing corresponding thermal treatment to obtain the a copper alloy rheoforming product. The method has the advantages of being small in process and high in formation efficiency; the obtained product is complex in structure, dense and uniform in structure, and high in performance.

The invention discloses a metal surface treatment spiral roller and treating device and method, and belongs to the field of metal surface treatment. The metal surface treatment spiral roller comprisesa roller body and a spiral line machining blade; and the device of the metal surface treatment spiral roller comprises the spiral roller, a worktable, a central control system, a tool displacement sensor, a tool load sensor and a metal component displacement sensor. The method for conducting metal surface treatment through the spiral roller comprises the steps: a metal component and the spiral roller are adjusted; the spiral roller moves in a self-rotating mode and moves in the normal direction relative to the surface of the metal component; and the horizontal displacement of the metal component is adjusted. The surface of the metal component is treated through the method, oxidized scale and a decarburized layer of the surface of metal or the metal component can be removed, meanwhile a surface layer structure with the obvious gradient feature can be obtained, the surface of the metal is strengthened, and the situation that in the long-time service process of the metal component underthe alternating load or cyclic load effect, fatigue cracks are produced in the surface of the metal is restrained; and meanwhile, abrasion resistance of the surface of the metal component is improved,and the service life of the metal component is prolonged.

The invention discloses a machining technology of cold rolled alloy flat steel. The machining technology of cold rolled alloy flat steel comprises the process steps of heat treatment, shot blasting, cold rolling, phosphorus saponification treatment, cold drawing, secondary heat treatment, secondary cold drawing, packaging and the like, wherein the carbon content of a raw material is 1.5-2.3%; thecold rolled alloy flat steel has high forming speed and high yield, does not damage a coating, and can be made into various cross-sectional forms to meet the requirements of using conditions; and coldrolling can cause large plastic deformation of the steel, so that the yield point of the steel is improved.