1376 results about "Fatigue resistance" patented technology

The invention relates to the technical field of metal powder processing, and discloses a high-performance dissimilar metal powder precision forming process which comprises the following steps: filling powder into a mold cavity, applying vibration disturbance, monitoring the change rate of a phase lag angle, judging that the powder is dense when the change rate is lower than an offset threshold value, outputting a pressing mode switching signal, an induction heating device is used for applying transient thermal load to induce cracks of an oxide film on the surfaces of particles, the pressure load is applied, the side wall is adjusted to generate shear displacement to peel off the oxide film, and metallurgical bonding is achieved through fresh metal surface contact. An interface is activated through thermal expansion mismatch and mechanical friction synergistically, a high-density uniform green body is obtained at low temperature, generation of brittle intermetallic compounds is inhibited, and the fatigue resistance of a formed part is enhanced.

The invention discloses fiber reinforced concrete for bridge deck pavement and a preparation method thereof, and belongs to the technical field of concrete. The fiber reinforced concrete is prepared from the following raw materials: Portland cement, modified basalt fiber, a slow-release mineralizer, a stress-oriented dispersing aid and the like. The modified basalt fiber is a basalt fiber which is subjected to amino silanization through a silane coupling agent KH-550 and then is catalytically grafted with ethylenediamine tetraacetic acid and hydroxyethyl methylacrylate through DCC (dicyclohexylcarbodiimide); the slow-release mineralizer comprises calcium sulphoaluminate and silicon-based coated nano calcium sulfate; the silicon-based coated nano calcium sulfate is core-shell structure powder formed by coating a nano calcium sulfate core material with a silicon dioxide shell layer; the concrete is strong in interface bonding, excellent in dynamic fatigue resistance, good in durability and stable in volume, and the problem that the mechanical property, the durability and the dynamic anti-interference capability of the concrete cannot be considered at the same time is solved.

The invention relates to the technical field of welding, and particularly discloses an anti-fatigue welding process for a long-distance pipeline supporting steel structure. The process comprises the steps that a font groove structure is determined, and pre-welding polishing pretreatment and layered welding are conducted; fatigue samples of weld toe areas with different arc radiuses are collected, crack feature coordinates and stress concentration coefficients are extracted, failure modes are divided based on clustering, the arc radiuses are verified as main control factors of fatigue failure through multiple linear regression, and a core control range is determined by combining process capability indexes; carrying out fatigue verification on the basis of core parameter extension radius gradient, carrying out process compatibility matching in combination with a controllable interval and a thermal deformation interval of equipment, and outputting a radius candidate value through a response surface method; on-site construction constraints are collected, laboratory path space compatibility is analyzed, a formed track is optimized in a segmented mode, and constraint compensation factors are embedded. The anti-fatigue performance of the weld toe area of the supporting steel structure can be improved, and quality guarantee is provided for welding of the long-distance pipeline supporting steel structure.

The invention discloses an ultra-flexible stretchable dimming film and a preparation method thereof, and relates to the technical field of dimming films, and the ultra-flexible stretchable dimming film comprises an upper transparent electrode layer, a dimming function layer and a lower transparent electrode layer which are sequentially stacked from top to bottom; the preparation method comprises the following steps: 1) preparing a main matrix material / ultraviolet curing resin mixture; 2) assembling the dimming film; and 3) ultraviolet light curing. According to the invention, through surface phosphonic acid functionalization treatment, covalent bond anchoring of cerium oxide nanoparticles is realized on a thermoplastic polyurethane fiber network; by constructing a full-thermoplastic polyurethane material system, the breakthrough of interfacial compatibility between a fiber reinforced phase and a polymer matrix is realized, so that the film has high tensile strain capacity and excellent fatigue resistance on the premise of keeping high transparency.

The invention discloses an ejector pin anti-fatigue strengthening method based on multi-section variable-temperature treatment, and relates to the technical field of ejector pin anti-fatigue strengthening, and the ejector pin anti-fatigue strengthening method comprises the following steps: austenitizing high-temperature quenching: heating an ejector pin to an austenitizing temperature, and then carrying out zoned cooling on the ejector pin; medium-temperature tempering and thermal-state mechanical strengthening are conducted, specifically, the ejector pin is tempered at the medium-temperature tempering temperature, and thermal-state shot blasting or laser shock is conducted on the ejector pin in the heat preservation period or after heat preservation is completed; intermediate low-temperature plasma nitriding: carrying out plasma nitriding in a nitrogen-hydrogen gas environment; subzero treatment: placing the ejector pin in liquid nitrogen; and finally, low-temperature tempering and cold-state mechanical strengthening are conducted. Through multi-section temperature gradient treatment, phase change distribution control over different temperature sections is achieved, too high internal stress and brittleness generated by one-time quenching are avoided, sudden size change and hot cracks induced by phase change are prevented, a controllable surface-core hardness and toughness gradient is formed, the surface crack initiation tendency is reduced, and the surface quality is improved. And the consistency and controllability of anti-fatigue basic conditions are improved.

The invention provides corrosion-fatigue-resistant ultrahigh-strength maritime work steel and a preparation method thereof, and relates to the technical field of maritime work steel manufacturing. The maritime work steel comprises the following components in percentage by mass: 0.04 to 0.07 percent of C, 0.20 to 0.26 percent of Si, 1.45 to 1.60 percent of Mn, less than or equal to 0.01 percent of P, less than or equal to 0.015 percent of S, 1.44 to 1.52 percent of Cr, 1.44 to 1.52 percent of Ni, 0.88 to 0.96 percent of Cu, 0.08 to 0.12 percent of Nb, 0.08 to 0.12 percent of Sb and the balance of Fe and inevitable impurities. The corrosion-fatigue-resistant ultrahigh-strength maritime work steel is prepared through raw material smelting and casting, austenitizing heat treatment, multi-pass hot rolling and cooling and temperature control. The corrosion resistance, the fatigue resistance and the corrosion fatigue resistance of the ultrahigh-strength maritime work steel are remarkably improved while the mechanical property of the ultrahigh-strength maritime work steel is improved, and the ultrahigh-strength maritime work steel has great significance in guaranteeing safe and stable operation of ocean engineering.

The invention discloses a flexible three-degree-of-freedom platform with attitude adjustment, impact resistance and vibration isolation functions, and relates to the technical field of heavy-load precision assembly and attitude adjustment, the flexible three-degree-of-freedom platform comprises a fixed base, a movable platform and a plurality of branch chains connected between the fixed base and the movable platform, the branch chains are flexible branch chains, and each flexible branch chain comprises a composite flexible hinge, a plurality of flexible connecting rods and a plurality of flexible connecting rods, the two ends of the composite flexible hinge are connected with the fixed base and the movable platform respectively, and the composite flexible hinge comprises a metal core and a composite material jacket wrapping the metal core; the transmission rod is in transmission connection with the composite flexible hinge; the hydraulic buffers are integrated in the flexible branch chains and used for absorbing impact loads; the buffering assembly is installed on the fixed base and used for buffering the movable platform through the flexible branch chains; by arranging the composite flexible hinge, the strength of metal and the anti-fatigue characteristic of a composite material are combined, the fatigue problem of a metal hinge is avoided, the service life of the platform under the heavy-load working condition is prolonged, and the reliability of the platform under the heavy-load working condition is improved.

The invention discloses a special cable for a complex environment and a preparation method of the special cable. The special cable comprises a cable core, a composite protection layer, an armor layer and an outer coating layer, the composite protective layer comprises an inner sheath layer, a middle reinforcing layer and an outer sheath layer; the armor layer is formed by wrapping a metal belt, the inner side of the armor layer is provided with a continuous bulge structure, and the continuous bulge structure is embedded with the spiral grooves in the surface of the outer sheath layer to form mechanical interlocking, so that displacement and looseness of the armor layer are effectively prevented; the reinforcing core body is embedded in the groove in the outer side of the metal belt, and the reinforcing core body and the metal belt are fixed through the spring piece, so that reinforcing buffering is formed, the anti-fatigue and anti-impact performance is remarkably improved, and the cable is suitable for complex working conditions of dynamic bending, torsion and frequent vibration, such as ocean cables, trailing cables and robot cables. The device has the advantages of being stable in structure, high in fatigue resistance and long in service life. The preparation method comprises the steps of spiral groove processing, metal belt pre-forming, reinforcing core inlaying, spring piece fixing, wrapping and armoring and the like, the process is reliable, and the method is suitable for large-scale production.

The utility model relates to the technical field of oil field underground oil extraction tools, and discloses a deep well fracturing packer rubber sleeve, which comprises an outer layer flexible sealing ring, an inner layer flexible sealing ring, an inner layer flexible sealing ring and an outer layer flexible sealing ring, and the outer layer flexible sealing ring is used for adapting to the surface of a well wall and realizing sealing; the middle composite buffer layer is used for buffering external pressure and absorbing stress generated by expansion; the inner-layer rigid supporting framework is used for providing structural support and limiting the expansion range of the rubber sleeve; the outer layer flexible sealing ring is of a gradient type flexible protruding structure. According to the utility model, the outer-layer flexible sealing ring adapts to an irregular well wall and realizes tight sealing through a gradient structure and micro lines, the middle composite buffer layer absorbs external pressure and disperses expansion stress, the anti-fatigue capability of the rubber sleeve is enhanced, and the inner-layer rigid supporting framework controls deformation through the supporting ribs and the compensation grooves; and the long-term stability of the rubber sleeve under high-pressure and high-temperature conditions is ensured.

The invention discloses a low-temperature curing photoresist applied to a flexible display panel and a preparation method of the low-temperature curing photoresist, and belongs to the technical field of energy conservation and environmental protection. The photoresist is prepared by compounding a reactive organic-inorganic mixed nano filler, a photosensitive resin matrix, a benzocyclobutenyl silicone oligomer (BSA resin) and an additive. The preparation method comprises the following steps: preparation and surface modification of the nanofiller; synthesizing a photosensitive resin matrix; compounding the oligomer with an additive; dispersing the slurry and adding a nano corrugated template; spin coating, ultraviolet pre-curing, low-temperature baking and heat post-curing are carried out. The curing temperature of the photoresist is lower than 120 DEG C, the resolution ratio is superior to 3 microns, and the bending tolerance frequency is gt; the adhesion strength is gt after 20000 times; 15 Kgf / cm < 2 >, and the water vapor permeability is lt; 10 <-6 >, heat resistance gt; the temperature is 150 DEG C, and the dielectric constant is lt; 3.5, VOC (Volatile Organic Compounds) emission lt; the organic light-emitting material has excellent flexibility, thermal stability and environmental protection performance, is suitable for a pixel definition layer of an OLED flexible display panel, and improves the light extraction efficiency and the anti-fatigue performance.

The hydrogen transmission pipeline steel comprises the following chemical components in percentage by mass: 0.020%-0.045% of C, 0.11%-0.19% of Si, 1.45%-1.65% of Mn, less than or equal to 0.0010% of S, less than or equal to 0.008% of P, 0.015%-0.045% of Al, 0.040%-0.060% of Nb, 0.020%-0.035% of Ti, 0.30%-0.50% of Cr, 0.0040%-0.0080% of RE, less than or equal to 0.004% of N, less than or equal to 0.0015% of O, less than or equal to 0.0001% of H and the balance of Fe and other inevitable impurities, the conditions that the carbon equivalent Ceq = C + Mn / 6 + (Cr) / 5 is less than or equal to 0.35%, the Nb / Ti = the rare earth element is selected from at least one of lanthanum, cerium and neodymium. The invention aims to solve the technical problems that the existing hydrogen transmission pipeline steel is easy to generate hydrogen embrittlement, short in fatigue life and high in production cost in a high-pressure hydrogen environment, and meets the core requirements of hydrogen energy long-distance transmission pipeline engineering on high strength, high hydrogen embrittlement resistance, high fatigue performance and low cost of materials.

The invention discloses an energy-absorbing and shock-reducing rubber material for an ocean platform and a preparation method of the energy-absorbing and shock-reducing rubber material. The rubber material is prepared from the following raw material components: a rubber matrix, a reinforcing filler, a vulcanizing aid, a vulcanizing agent, a silane coupling agent, a vulcanizing activator, an anti-aging agent, protective wax, tear-resistant resin and paraffin oil, the preparation method comprises the following steps: plastifying, preparing master batch, preparing final mixed rubber, and vulcanizing and molding. The natural rubber and butadiene styrene rubber blend is used as a matrix, the natural rubber endows the material with high elasticity, and the butadiene styrene rubber is used for improving the aging resistance of the material; the carbon black and the fumed silica are used as reinforcing fillers, and the dispersion state of the fumed silica is optimized through the silane coupling agent, so that the mechanical properties of the energy-absorbing and shock-reducing rubber material are effectively enhanced. The prepared energy-absorbing and shock-reducing rubber material for the ocean platform can effectively overcome the defects of natural rubber in the aspects of aging resistance, seawater corrosion resistance, oil resistance and chemical corrosion resistance, and meanwhile, the excellent high-damping characteristic and fatigue resistance of the natural rubber are reserved.

The invention relates to the technical field of preparation of stimuli-responsive hydrogel, in particular to sea cucumber ion skin imitating double-dynamic topology hydrogel as well as a preparation method and application of the sea cucumber ion skin imitating double-dynamic topology hydrogel. The thermo-sensitive poly (N-isopropylacrylamide) hydrogel is used as a continuous matrix and is used for simulating the dynamic adaptability of sea cucumber skin; and the ionic conductive microgel is used as a rigid dispersion phase and is used for simulating a collagenous fiber network of a connective tissue layer of the sea cucumber. The microgel is dispersed in the poly (N-isopropylacrylamide) hydrogel and is physically entangled with the poly (N-isopropylacrylamide) hydrogel to form a cross-linking point, so that a dynamic network of'rigid node-flexible matrix 'is constructed. The dynamic network structure endows the double-dynamic topological hydrogel with force and heat double toughening properties and ultralow mechanical hysteresis, so that the double-dynamic topological hydrogel has excellent elasticity, fatigue resistance, low hysteresis and strain rate insensitivity, and further shows wide application prospects in the fields of flexible sensing and wearable equipment.

The utility model discloses automatic welding equipment for the end face of a spiral plate, which relates to the technical field of welding, aims to solve the technical problem that the welding path of a spiral plate heat exchanger is single, and comprises a base, a rotating mechanism, a control operation cabinet, a cross module mechanism, a laser tracking sensor and a composite welding holder. The composite welding holder is composed of a bearing table, an indexing assembly and an execution assembly, the indexing assembly can provide two working modes of continuous rotation and intermittent rotation, and the execution assembly drives the welding gun to be overlapped on a reference spiral track to form a wavy spiral welding track and a bevel spiral welding track. Automatic welding of two kinds of high-performance welding seams is achieved through one set of equipment, the anti-fatigue advantage of a wave-shaped track and the high-strength characteristic of a bevel-shaped track are both achieved, stress distribution of the welding seams is effectively improved, and welding quality, efficiency and equipment universality are remarkably improved.

The invention relates to a high-temperature-resistant reusable self-aligning roller bearing, and belongs to the technical field of bearings. A roller is arranged between an inner ring and an outer ring, and the inner ring is made of Al0. 5CrCoFeW0. 5Ni high-entropy alloy; the oxidation resistance, the strength, the stability and the wear resistance during working are met; the outer side surface of the inner ring is subjected to ion implantation modification to form a modified layer of the inner ring; the TiAlN coating reduces energy loss, and the first Ag coating is used for conducting heat and reducing oxidation loss; the outer ring is made of an Al < 0.5 > CoCrFeV < 0.5 > Ni high-entropy alloy; the high bearing capacity, the wear resistance, the fatigue resistance, the dimensional stability and the corrosion resistance in the working process are met; the modified layer on the inner side surface of the outer ring is used for improving the surface hardness and enhancing the wear resistance; the CrAlN coating is used for improving oxidation resistance, and the second Ag coating is used for conducting heat and reducing oxidation loss; the roller is made of an AlCoCrFeNi2. 1Nb0. 6 high-entropy alloy; a lubricating structure on the surface of the roller comprises an annular groove and graphite fluoride; a lubricating film is formed when the raceway and the roller rub each other, and the integrity of the lubricating film is maintained.

The invention provides a glass fiber impregnating compound for reinforcing epoxy resin as well as a preparation method, a product and application of the glass fiber impregnating compound. The impregnating compound comprises effective components and water, the solid content is 5.0%-10.0%, and the balance is water; the impregnating compound comprises the following effective components in percentage by mass: 5%-32% of the silane coupling agent, 35%-80% of the film-forming agent, 10%-30% of the lubricant, 1%-6% of the surface additive, 2%-10% of the cross-linking agent and 1%-6% of the pH value regulator. The silane coupling agent is a mixture of a cationic aminotoluene functionalized silane coupling agent and a cationic benzimidazole silane coupling agent. The glass fiber yarn produced by adopting the impregnating compound is less in hairiness, good in flexibility, good in interface compatibility with epoxy resin, excellent in transverse tensile property and suitable for producing a wind power blade base material, and when the base material and the epoxy resin are used for vacuum infusion, the resin is rapidly and completely soaked, and the service life of the resin is prolonged. And the poured composite material has few forming defects and excellent static mechanical properties and fatigue resistance.

The invention relates to the technical field of reinforced concrete, in particular to a preparation technology of a reinforced concrete telegraph pole, the performance of the concrete telegraph pole is improved through a multi-scale fiber synergistic toughening method, when the telegraph pole bears a bending load, steel fibers firstly play a role to restrain large cracks, and when micro cracks appear, the steel fibers play a role to restrain the large cracks. The denser composite fiber network bears stress to realize multi-stage crack resistance, which is combined with the high early strength characteristic of the sulphoaluminate cement, so that the telegraph pole has excellent impact resistance and fatigue resistance while obtaining extremely high early strength; the surface of the aggregate modified by the silicon dioxide aerogel is covered with a high-activity and high-specific-surface-area nano silicon dioxide layer, and in an alkali-rich and calcium-rich environment provided by sulfo-aluminate water cement hydration, the nano silicon dioxide and a cement hydration product are subjected to a violent pozzolanic reaction, so that the surface of the aggregate is modified by the sulfo-aluminate water cement; therefore, the compressive strength and the flexural tensile strength of the concrete are remarkably improved.

The invention discloses a pressing clamp for automobile half axle machining, and relates to the technical field of automobile half axle machining, the pressing clamp comprises moving seats which are arranged in a bilateral symmetry mode, the moving seats are used for being installed on a machine tool and can move towards or away from each other along a guide rail of the machine tool, and clamping mechanisms are installed on the moving seats through first driving mechanisms; and a bearing mechanism is mounted on the moving seat through a second driving mechanism. The device has the advantages that the process integration of positioning, machining and online deburring is realized; the adjusting unit drives the cleaning ring to axially move, the deflection seat drives the cleaning ring to circumferentially deviate, the cleaning ring is matched with the inner limiting ring, the cleaning ring and the inner limiting ring are matched in a staggered mode before milling groove machining operation so as to circumferentially wrap and press the spline end, rigid clamping without circumferential sliding is provided during machining, and the angular precision of milling grooves is guaranteed. And after the clamp spring notch is milled in the spline end, burrs at the joint of the spline end tooth groove and the clamp spring notch and burrs on the inner wall of the clamp spring notch are scraped off, and the fatigue resistance and reliability of the automobile half shaft piece are improved.

A kind of pentacene field effect transistor of improving anti-fatigue characteristic, n-type semiconductor layer and charge trapping layer with shallow energy level trap are arranged in pentacene field effect transistor structure;Device has bottom gate type structure: gate electrode / gate insulating layer / n-type semiconductor film / charge trapping dielectric layer with shallow energy level trap / tunneling layer / pentacene / source (drain) electrode;Gate electrode is conductor, resistivity is between 0.1-0.001 Ω·cm;Gate insulating layer dielectric film is insulator, thickness range is 5-150nm;The thickness of n-type semiconductor film layer is 1-200nm;Charge trapping dielectric layer with shallow energy level hole trap, thickness is 1-100nm;Tunneling layer is insulator, thickness range is 1-20nm;Pentacene thickness range is 1-100nm;Source-drain electrode is conductor, thickness range is 50-200nm;Gate electrode is conductor.

The invention discloses a surface coating for prolonging the fatigue life of metal and a preparation method of the surface coating. According to the coating, face-centered cubic structure layers and hexagonal system structure layers are alternately stacked to form a superlattice structure, the total thickness ranges from 1.0 micrometer to 1.5 micrometers, and a base material is titanium alloy. The thickness of the face-centered cubic structure layer is 4-6 nm, the thickness of the hexagonal system structure layer is 1-3 nm, the Mohs hardness difference between the two layers is not larger than 2, and the average grain size is 1-2 nm. According to the coating, a stable high-toughness interface phase is obtained through a specific crystal structure and thickness regulation and control, and dislocation slippage and crack propagation are effectively prevented. A magnetron sputtering method is adopted for preparation, and the process comprises the steps of substrate surface pretreatment, bias cleaning and alternate deposition. The coating shows excellent anti-fatigue performance under the cyclic load condition, and the service life of the titanium alloy component can be remarkably prolonged.

The invention provides an interface-stable and anti-fatigue Janus conductive hydrogel, a preparation method and sensing application, and the preparation method comprises the following steps: uniformly mixing acrylic acid, ethylene glycol dimethacrylate, a photoinitiator, ferric chloride hexahydrate and deionized water to obtain a support layer precursor solution; mixing acrylic acid, lauryl methacrylate, N, N '-methylene bisacrylamide and the nanocellulose suspension, performing ultrasonic treatment to obtain a Pickering emulsion, adding a photoinitiator into the Pickering emulsion, and uniformly mixing to obtain an adhesion layer precursor solution; and pouring the support layer precursor solution into a mold, then slowly pouring the adhesion layer precursor solution onto the support layer precursor solution, carrying out ultraviolet curing, taking out from the mold, and cleaning to obtain the Janus conductive hydrogel. According to the method, the Pickering emulsion phase separation and the charge shielding effect are combined through a simple and convenient one-step method, and the problems that a traditional multi-layer assembly process is complex in operation and unstable in interface are effectively solved.

The invention discloses a stirring assembly and a stirrer. The stirring assembly comprises at least one stirring blade and a fastening assembly; each stirring blade comprises an integrally formed connecting seat and at least one blade, and the plurality of stirring blades are stacked in an axially aligned manner through the connecting seats; and the fastening assembly is suitable for detachably and fixedly connecting the connecting seat of the stirring blade with the transmission shaft. The stirrer comprises the stirring assembly. The reaction kettle has the beneficial effects that the mounting mode of the stirring blades is converted from welding to fastening connection, so that the mounting procedure of the stirring blades can be carried out in the reaction kettle, and the problem of complicated mounting of the stirring blades caused by the size limitation of a manhole of a container can be avoided. The stirring blades and the transmission shaft are connected through the mechanical fastening assembly, the problem of inherent stress concentration at the connecting position in a traditional welding mode can be solved, and the anti-fatigue performance of components under alternating loads is greatly improved.

The invention relates to the technical field of motor clamp springs, and particularly discloses a high-strength ultrathin titanium alloy for a motor clamp spring and a preparation method thereof.The preparation method comprises the steps that firstly, a titanium alloy cast ingot is subjected to hot forging machining, coarse and large crystal grains are crushed, then hot rolling is conducted, and in the hot rolling process, pulse current is adopted for assisting, and the high-strength ultrathin titanium alloy is obtained through the electroplastic effect; the method comprises the following steps: carrying out hot rolling to obtain a grain structure finer and more uniform than traditional hot rolling, then carrying out shot blasting treatment and carbonitriding treatment on the surface of a titanium alloy matrix to enhance the hardness, strength, wear resistance and fatigue resistance of the material, and finally, introducing a residual compressive stress field while eliminating surface defects and increasing surface compactness by adopting a heat-assisted ultrasonic rolling process, so as to improve the wear resistance of the material. The generation and expansion of fatigue microcracks are inhibited, and the anti-fatigue performance of the material is enhanced.

The utility model relates to a composite photovoltaic inhaul cable, which comprises a composite anti-corrosion cable body, two ends of the composite anti-corrosion cable body are respectively wrapped in a variable cross-section extrusion sleeve of an inner cavity structure, one end of the variable cross-section extrusion sleeve is open, and the opening is sealed by an arc-shaped gland. The variable cross-section extrusion sleeve is divided into a guide arc-shaped conical surface, a first extrusion surface, an excessive pressure relief section, a second extrusion surface and a non-extrusion surface which are sequentially arranged backwards from an opening, the composite anti-corrosion cable body comprises a zinc-aluminum alloy steel strand or an epoxy coating steel strand, and the surface of the steel strand is wrapped with an extrusion bond-wrapping type polyurea layer. Due to the design of a brand-new anchoring mode and the improvement of anti-corrosion measures, the corrosion resistance of the inhaul cable is achieved, and the inhaul cable has the advantages of being high in stress fatigue resistance, good in shock resistance, reliable in anchoring performance, compact in anchorage device structure, convenient to manufacture, install and replace and the like.

The invention discloses a production method of 590MPa-grade high-fatigue-resistance acid pickling rim steel. The production method comprises the working procedures of smelting, continuous casting, hot rolling and acid pickling. Key process control and parameters are disclosed; the high-fatigue-resistance pickling rim steel comprises the following chemical components in percentage by mass: 0.06%-0.10% of C, less than or equal to 0.08% of S i, 1.20%-1.60% of Mn, less than or equal to 0.018% of P, less than or equal to 0.003% of S, 0.020%-0.060% of Alt, 0.030%-0.055% of Nb, 0.010%-0.040% of Ti, less than or equal to 0.0050% of N, less than or equal to 0.0020% of O, and the balance of Fe and impurities, wherein T i is greater than 3.42 N + 3S. The steel provided by the invention not only has high strength and good formability, but also has excellent high cycle fatigue resistance.

The invention discloses a silicon nitride ceramic formula and a preparation process of a bearing roller matched with the silicon nitride ceramic formula, belongs to the technical field of ceramic materials, and aims to solve the problem of rolling contact fatigue failure caused by insufficient fracture toughness and microscopic crack propagation of an existing silicon nitride bearing roller under high-speed and heavy-load working conditions. The core formula of the invention comprises an alpha-Si3N4 matrix, a composite rare earth additive, a nano TiC modifier and an MgO heat conduction enhancer. The fracture toughness and fatigue resistance of the material are remarkably improved through process nano powder ultrasonic pre-dispersion, closed nitrogen circulation spray granulation, two-step air pressure sintering and cryogenic-thermal tempering gradient stress treatment.

The invention discloses high-strength nylon for a humanoid robot and a preparation method of the high-strength nylon. According to the composite material, MXD6 nylon and PA66 nylon are used as a composite matrix, chopped carbon fibers are used as a main reinforcement body, and a flexibilizer, an antioxidant, a lubricant and a nucleating agent are added. The preparation method comprises the following steps: performing vacuum drying on the raw materials, putting the dried raw materials into a double-screw extruder according to a specific ratio, and performing melt blending and granulation at a precisely controlled temperature interval (240-285 DEG C) and a screw rotating speed; and drying the obtained particles, and molding the dried particles into the required structural member through an injection molding machine under specific process parameters. Through synergistic interaction of MXD6 and PA66 and optimization of a processing technology, the composite material with high strength, high rigidity, high fatigue resistance, excellent impact toughness and extremely low water absorption is successfully prepared, and the technical problem that performance of an existing humanoid robot structural part material is unbalanced is perfectly solved; and the motion precision, the load capacity and the long-term reliability of the robot are obviously improved.

The invention belongs to the technical field of foaming polyurethane, and provides a microsphere foaming polyurethane material, a base plate and a preparation method and application of the base plate, raw materials are prepared from a polyol component and an isocyanate component according to the proportion that the isocyanate index is 1.05-1.15; wherein the polyol component is prepared from the following components in parts by mass: 60 to 65 parts of polytetrahydrofuran polyol, 10 to 15 parts of poly trimethylene ether glycol, 6 to 8 parts of polypropylene oxide polyol A, 6 to 10 parts of polypropylene oxide polyol B, 4 to 6 parts of 1, 4-butanediol, 0.5 to 1.5 parts of trimethylolpropane, 0.3 to 0.5 part of a catalyst, 0.8 to 1.5 parts of a foam stabilizer, 0.5 to 0.7 part of a dispersing agent EFKA-4040 and 0.1 to 0.3 part of polyether modified polysiloxane BYK-333; 0.4 to 0.6 part of expansion microspheres and 0.1 to 0.3 part of water. According to the technical scheme, the problem that a polyurethane material in the prior art cannot have low compression set and excellent fatigue resistance at the same time is solved.

The invention relates to corrosion-resistant spring steel for a high-speed railway elastic strip and a production method thereof, and belongs to the technical field of metallurgy. The spring steel comprises the following chemical components in percentage by mass: 0.55 to 0.60 percent of C, 1.6 to 2.0 percent of Si, 0.70 to 0.90 percent of Mn, 0.015 to 0.035 percent of P, less than or equal to 0.005 percent of S, 0.10 to 0.30 percent of Ni, 0.50 to 0.70 percent of Cr, 0.10 to 0.20 percent of Cu, 0.02 to 0.04 percent of Nb, less than or equal to 0.03 percent of Al, 0.01 to 0.03 percent of RE and the balance of Fe and inevitable impurities. The production method comprises the steps of smelting, continuous casting, heating, rolling and heat treatment. An elastic strip processed from the spring steel has the advantages of high surface decarburization resistance, excellent fatigue resistance, excellent corrosion resistance, excellent hydrogen embrittlement resistance and the like, and meets the requirements of complicated and harsh working conditions of railways.

The utility model relates to the technical field of automobile door supports, in particular to an automobile door hinge support device which comprises a body support, a first butt-joint plate, a second butt-joint plate, a welding assembly and a reinforcing rib assembly, the first butt-joint plate is fixedly welded to the top of the body support, the welding assembly comprises a welding plate, the welding plate is arranged in a triangular shape, and the reinforcing rib assembly is arranged on the body support. The top of the welding plate is fixedly connected with a second butt joint plate through an aluminum plate, and the reinforcing rib assembly comprises a set of supporting plates. According to the automobile door hinge, the main body support, the reinforcing rib assembly and the welding assembly are arranged to form an integrated structure, the aluminum alloy casting structure is adopted, the requirement for the support of the automobile door hinge with light weight and high strength is met, the anti-fatigue performance of an automobile door is improved in cooperation with multi-bolt connection, the installation process is simplified, and meanwhile the maintenance cost is reduced.