24results about How to "Improve service performance" patented technology

The invention discloses modified high-carbon alloy steel and a preparation method and application thereof, and belongs to the technical field of high-carbon alloy steel for aluminum alloy forming dies. The preparation method disclosed by the invention comprises the following steps: carrying out electroslag remelting on a high-carbon alloy steel rod to obtain a casting blank; carrying out thermoplastic deformation on the casting blank to obtain a blank; the blank is annealed, so that carbides in the blank are eliminated or become fine particles, spherical graphite can be separated out, and the modified high-carbon alloy steel is obtained; the particle size of the fine particles is smaller than 10 microns. According to the method, coarse and large carbides which are difficult to eliminate in the high-carbon aluminum alloy forming die steel containing strong carbide forming elements such as Cr, Mo and V or medium-strong carbide forming elements are subjected to rapid and basic graphitization through a thermoplastic deformation and high-temperature graphitization combined process; the technical problem that carbide decomposition and graphite precipitation control are difficult to realize in the existing method is solved.

This invention provides a low-cost, bimodal particle size distribution titanium-based powder for additive manufacturing, titanium-based parts, and a method for preparing the same. The method utilizes two different medium particle sizes D... 50 Using near-spherical titanium-based powder as raw material, a near-spherical bimodal particle size distribution titanium-based powder with good uniformity is obtained by wet mixing of suspension and rotary degreasing in a furnace. Various near-spherical bimodal particle size distribution titanium-based powders can also be prepared. The difference between these powders lies in the different particle size ratios and mass ratios of the two raw material powders used. The bulk density and flowability of each bimodal powder are tested to determine the range of particle size ratios and mass ratios of the two powders in near-spherical bimodal particle size distribution powders with high bulk density and flowability. This guides the preparation of high-quality near-spherical bimodal particle size distribution titanium-based powders for additive manufacturing. Ultimately, additive manufacturing technology is used to prepare high-performance, low-cost titanium-based parts to meet the stringent performance requirements of titanium components in high-end fields such as aerospace.

This invention discloses a multi-process synergistic method for strengthening and toughening titanium alloys. The method includes: firstly, pre-treating the titanium alloy surface with sandblasting; then, subjecting the pre-treated titanium alloy to solid embedding carburizing treatment; subsequently, under inert atmosphere protection, sequentially subjecting the carburized titanium alloy to solution treatment, rapid cryogenic treatment, and aging treatment; and finally, shot peening the surface of the heat-treated titanium alloy. This invention solves the problem in existing technologies where a single process is insufficient to synergistically improve the strength and toughness of titanium alloys, achieving a synergistic match between high strength and high hardness on the surface of the titanium alloy material and high toughness in the matrix.

The invention discloses a special ultrahigh corrosion-resistant high-pressure cast aluminum alloy for marine equipment and a preparation process of the special ultrahigh corrosion-resistant high-pressure cast aluminum alloy. The aluminum alloy is designed by taking aluminum as a matrix and synergistically adding silicon, magnesium, various transition elements and rare earth elements of cerium and lanthanum in a specific proportion. The preparation process sequentially comprises the steps of smelting and refining, high-pressure die casting, heat treatment and surface treatment. Through the unique component design and the systematic combination of the whole-process technology, the high-pressure casting manufacturability of the alloy is kept, meanwhile, the marine corrosion resistance and the mechanical property are comprehensively improved, and the alloy is suitable for structural parts such as marine ship engine parts in the severe environment.

The application discloses a kind of surface micro-arc oxidation dense ceramic film aluminum alloy and its preparation method.After annealing treatment of aluminum alloy base material, it is in turn treated by oil and grease removal, micro-arc oxidation and drying, and obtained;The conditions of the annealing treatment are as follows: temperature is 200-300 DEG C, time is 50-80 min;The conditions of the micro-arc oxidation are as follows: current density is 8-10 A / dm 2 , time is 15-20 min;The method forms dense ceramic film on the surface of alloy base material through the synergistic effect of annealing and maintenance oxidation, which can effectively improve the comprehensive performance of the material;The aluminum alloy obtained by the technical scheme of the application has excellent corrosion resistance and wear resistance, and solves the corrosion problem of aluminum alloy welding structure in high temperature, high humidity and high salt mist environment.

The application discloses an aero-engine hot-end component full-life-cycle management method and system, and belongs to the technical field of aero-engines.The system constructs a full-life-cycle closed loop system of material gene optimization-precision forming process-service health monitoring-life prediction and active repair, can realize service life improvement of more than 200% of the aero-engine hot-end component, and improves the production yield rate from the conventional 60% in the industry to more than 90%.The application fills the core short board of short life, poor reliability and low yield rate of the aero-engine hot-end component in China, breaks through the core technical bottleneck of the "industrial crown pearl" of the aero-engine, and is 100% domestically produced and controllable in material and process, and can be widely applied to scenes such as army armed helicopter turboshaft engines, military unmanned aircraft turbojet / turbofan engines and the like.

The application relates to the technical field of part machining, in particular to a connecting hole surface rolling device and a rolling method. The connecting hole surface rolling device comprises a mandrel, a sleeve and a plurality of rolling balls, the sleeve is sleeved on the mandrel, and the plurality of rolling balls are uniformly and intervally arranged on the sleeve. The mandrel can move along the axial direction and rotate along the circumferential direction, the mandrel has an equal-diameter section, a variable-diameter section and a limiting ring which are sequentially connected from top to bottom, the cross-sectional area of the variable-diameter section gradually increases from top to bottom, the sleeve can move on the equal-diameter section and the variable-diameter section, and the limiting ring limits the sleeve from separating from one end of the variable-diameter section away from the equal-diameter section. The sleeve penetrates the connecting hole of a workpiece from top to bottom, the workpiece drives the sleeve to move to the equal-diameter section, so that the rolling balls roll against the hole wall of the connecting hole. The sleeve penetrates the connecting hole from bottom to top, the workpiece drives the sleeve to move to the variable-diameter section, so that the outer circumferential surface of the mandrel forces the rolling balls to press against the hole wall of the connecting hole, and the rolling pressure of the rolling balls against the hole wall of the connecting hole gradually increases from top to bottom.

The invention discloses a laser shock marking method for a gear transmission component. The laser shock marking method comprises the steps that the to-be-marked position of the gear transmission component is determined; forming a light-transmitting restraint layer capable of allowing high-amplitude plasma shock waves to propagate on the surface of the position to be marked; adjusting the distance between the position to be marked and the laser to a preset distance; performing laser impact marking on the to-be-marked position based on a laser; a pit is introduced into the surface of the position to be marked based on laser spot impact induced plastic deformation; and forming a mark based on continuous lap joint of the pits. According to the impact marking method, an absorption layer is not used in the marking process, the marking efficiency is improved, the marking width is increased, the mechanical property of the material is greatly improved, and the fatigue life of the material is greatly prolonged.

A method for preparing gradient cemented carbide based on differentiated ball milling and using pre-alloyed cobalt-nickel as the binder phase includes the following steps: (1) preparation of pre-alloyed cobalt-nickel binder powder; (2) preparation of surface mixed powder; (3) preparation of core mixed powder; (4) spark plasma sintering. This invention pre-alloys Co powder and Ni powder, which is beneficial for improving the compositional uniformity and distribution uniformity of the CoNi binder phase, and for ensuring stable distribution of the binder phase during sintering; differentiated ball milling of the surface layer and core layer establishes the interlayer structure basis of the gradient cemented carbide from the powder source; the gradient structure gives the surface layer higher hardness and wear resistance, and the core layer better toughness and crack resistance, achieving a unified matching of high surface hardness and high core toughness; densification is achieved by pre-pressing combined with spark plasma sintering, resulting in a gradient cemented carbide with clear layered structure characteristics and excellent comprehensive service performance.

The invention discloses a composite device and method for preparing a double-metal gradient structure circular pipe through single-step deformation. The composite device comprises a first half die, a second half die, a first forming die, a second forming die, a clamp, a punch, a supporting rod and a taking-out rod, modular integrated design is adopted, and disassembly and combination are convenient. Through cooperative plastic flowing of the forming channel, the outer layer metal material and the inner layer metal material are stably combined in the one-time forming process, the problems of multi-pass machining, mold replacement and the like in a traditional technology are solved, and the production efficiency is remarkably improved. The gradient structure can effectively improve stress distribution between the inner metal layer and the outer metal layer, and the fatigue life and the overall service performance of the pipe are improved. The method is suitable for combination of various metal materials, has wide application prospects, and particularly has important application values in the fields requiring high strength, corrosion resistance, wear resistance and the like.

The application discloses a high-strength wear-resistant steel welding method, which uses a welding wire with components in percentage by mass as follows: C 0.08-0.11%, Si 0.66-0.82%, Mn 1.85-2.30%, Ni 0.01-0.32%, S ≤0.02%, P ≤0.02%, Cr 0.02-0.04%, Cu 0.09-0.12%, and Mo 0.10-0.25%. The welding wire is applied to a high-strength wear-resistant steel welding process to perform CO2 gas shielded welding, and a three-pass welding process method is adopted, so that the Vickers hardness difference of a weld zone and a heat-affected zone can be controlled within 40, the service performance of a welded joint is improved, the welding requirement of the high-strength wear-resistant steel is met, the application field of the high-strength wear-resistant steel is expanded, and the rapid development of new equipment manufacturing industry can be promoted.

The application provides a low-friction high-wear-resistance solid lubricating film, which comprises a substrate, a transition layer and a functional layer arranged in sequence from bottom to top; the transition layer comprises a bottom layer, an intermediate layer and an upper layer in sequence from bottom to top; the bottom layer is composed of Ta; the intermediate layer is composed of Ta and MoS2; the upper layer is composed of Ta, Pb and MoS2; and the functional layer is composed of Ta, Pb and MoS2. The transition layer of the application adopts a gradient structure, and the thermal expansion coefficients of Ta, Ta-MoS2 and Ta-Pb-MoS2 are changed layer by layer, which is more conducive to reducing stress concentration, thereby avoiding cracking and peeling of the solid lubricating film on the substrate and improving the bonding strength with the substrate; the functional layer has the functions of friction reduction and wear resistance, is based on MoS2, combines the high hardness of Ta metal, improves the wear resistance, and further reduces the friction coefficient of the soft metal Pb, thereby greatly improving the service performance and service life of the solid lubricating film.

This invention discloses a method for synergistic control of residual stress and microstructure in a pulsed current-assisted metal additive manufacturing process, belonging to the field of metal material additive manufacturing technology. The method includes the following steps: S1, setting the process parameters for metal additive manufacturing and planning the area and timing for synchronously applying pulsed current; S2, during the layer-by-layer deposition process of the component, when a high-energy laser beam, electron beam, or electric arc acts on the deposition area to form a molten pool, a pulsed power supply is triggered by a synchronous control unit to apply a pulsed current with preset parameters to the molten pool and the heat-affected zone; S3, through the synergistic effect of the electroplasticity and Joule heating of the pulsed current, thermal stress relaxation, grain refinement, and microstructure homogenization are simultaneously achieved during the manufacturing process. This invention, by employing the above method and precisely controlling the electrical pulse parameters, simultaneously achieves stress relaxation and solidification microstructure optimization during the manufacturing process, significantly improving the dimensional stability, fatigue life, and mechanical properties of the formed component.

The application discloses a high-temperature superconducting tape with non-uniform distribution of critical current density and a preparation method thereof, and belongs to the technical field of high-temperature superconducting materials. The critical current density of the high-temperature superconducting tape is non-uniformly distributed in the width direction, and the current distribution can be regulated according to requirements. The high-temperature superconducting tape comprises a high-temperature superconducting layer, and the chemical formula of the high-temperature superconducting layer is Re 1+a Ba 2+b Cu 3+c O 7‑d +x% (mol) BaMO3, wherein Re is selected from Y, Gd, Eu and Sm; M is selected from Hf, Zr and Sn; the preparation method comprises the following steps: depositing the high-temperature superconducting layer on a tape substrate; depositing a silver layer on the deposited tape; and performing heat treatment on the deposited tape in an oxygen environment, and further comprising the step of performing laser heat treatment after slitting and / or copper plating. The critical current density of the high-temperature superconducting tape of the application is non-uniformly distributed in the width direction and controllable, the failure risk of the tape is effectively reduced, and the service performance of the tape is improved.

The application relates to the technical field of alloy materials, in particular to a 4341E high-speed steel and a preparation method thereof. The high-speed steel is characterized in that Ti, B and N elements are introduced for ternary micro-alloying and synergistic modification on the basis of a W-Mo-V-Co component system, nanoscale particles generated in-situ by Ti-N are used as heterogeneous cores to significantly refine grains, the grain boundary is strengthened by the grain boundary segregation effect of boron elements, and the reticular carbide is effectively broken. The obtained steel material realizes perfect matching of high hardness, excellent red hardness and excellent impact toughness, solves the problem that the strength and toughness of traditional high-speed steel are difficult to be compatible, and is particularly suitable for manufacturing high-performance cutting tools, cold and hot precision dies and high-temperature wear-resistant parts.

The application discloses a liquid static pressure bearing with oil sealing surface air cushion drag reduction structure, which comprises a bearing body, an oil sealing surface air cushion drag reduction structure, a circumferential oil return groove and an axial oil return groove. A plurality of oil sealing surface air cushion drag reduction structures are arranged on the circumferential and axial holes of the bearing body. Each oil sealing surface air cushion drag reduction structure is composed of a rectangular oil sealing surface, a rectangular oil inlet groove, an oil inlet hole and a plurality of air inlet holes. The air inlet holes are densely distributed on the rectangular oil sealing surface close to the rectangular oil inlet groove. An air flow control unit is arranged in each air inlet hole. The circumferential oil return groove separates the circumferentially distributed oil sealing surface air cushion drag reduction structures, and the axial oil return groove separates the axially distributed oil sealing surface air cushion drag reduction structures. The oil sealing surface air cushion drag reduction structure can be widely applied to liquid static pressure linear bearings, radial bearings and thrust bearings, has good drag reduction effect and compact structure, and can obtain a liquid static pressure bearing with low heat generation, high stiffness and super-precision.

This invention discloses a construction process for mining anchor bolts, relating to the field of mining anchor bolt construction technology, including the following steps: raw material preparation and pretreatment; preparation of functionalized rolling penetrant; heating and roughing / intermediate rolling; online reactive finishing rolling; cooling and shaping; and post-treatment. This invention constructs a gradient composite modified layer on the anchor bolt surface through online reactive rolling, achieving interfacial chemical bonding and grain boundary indentation of nano-functional units. This not only reduces installation frictional resistance but also enhances the material's corrosion resistance and hydrogen embrittlement resistance through a dense shielding network and self-healing mechanism, ensuring the reliability of support in complex environments.

The invention discloses a method for reducing the precipitation temperature of a nano copper-rich phase and application of the method, and relates to the technical field of metal material precipitation strengthening. Rare earth metal elements are added into the copper-containing steel, and the precipitation temperature of a nano copper-rich phase is reduced to be not higher than 480 DEG C by regulating and controlling the copper precipitation behavior through the rare earth metal elements. According to the method, based on a 9R-Cu phase low-temperature precipitation mechanism of rare earth element micro regulation and control, the effective precipitation temperature of the 9R-Cu phase is reduced to 480 DEG C or below through the heterogeneous nucleation promotion effect of Ce atoms in the Cu precipitation process, so that it is guaranteed that a base material obtains the excellent strengthening effect, meanwhile, formation of a brittle phase on the interface of the composite material is avoided, and the service life of the composite material is prolonged. And coordination and unification of base material strengthening and interface stability are realized.

The invention discloses a cylinder part precision honing in-place finishing device and method. The cylinder part precision honing in-place finishing device comprises a machine tool base, and a cylinder part is installed on the upper surface of the machine tool base through a positioning clamp; the transmission system corresponds to the cylinder part; the multi-oilstone honing head is connected to the output end of the transmission system; the ball screw type linear module is arranged in the vertical direction relative to the machine tool base and is connected with the high-precision displacement control system; the honing dresser is mounted on the ball screw type linear module and is arranged corresponding to the multi-oilstone honing head; a displacement measuring unit is arranged on the ball screw type linear module and used for measuring the spatial position of the honing trimmer. The multi-oilstone honing head in-place coaxial finishing device achieves in-place coaxial finishing of multiple oilstone honing heads, avoids positioning errors caused by disassembly and assembly, has the advantages of being high in reliability, high in finishing precision, good in repeatability, low in dependence on skills of operators and the like, and is suitable for industrial honing finishing of high-precision cylinder parts.

The present application relates to a kind of variable wall thickness curved generatrix parts spinning method, belong to pipe precision forming field.This method combines the principle of plastic deformation volume invariable and the geometric structure characteristics of final part, by the mandrel spinning of initial cylindrical blank, realize the pre-preparation of quantitative difference thick pipe blank;Then the trajectory of spinning wheel is quantitatively calculated, and spinning deformation is carried out according to the calculated trajectory parameters, finally realize the processing of variable wall thickness curved generatrix pipe with neck-in structure on both sides.Compared with the traditional reducing forming process, the method can realize the quantitative control of wall thickness;Compared with the ordinary spinning forming pipe with neck-in structure on one side by re-welding forming mode, effectively avoid welding defects, ensure the consistency and surface quality of part.With the accurate control system of spinning equipment and the accurate calculation of blank structure size, the dimensional accuracy and surface quality of part are effectively guaranteed, and the forming precision and efficiency are improved.

The invention discloses a high-elastic damping composite asphalt material as well as a preparation method and application thereof, and belongs to the crossing field of road engineering and a new energy technology. The high-elastic damping composite asphalt material is prepared from the following raw materials in parts by weight: 100 parts of matrix asphalt, 4.4 to 4.6 parts of rock asphalt, 4.3 to 8.2 parts of rubber and 5.3 to 5.5 parts of SBS (Styrene Butadiene Styrene) modifier. The high-elastic damping composite asphalt material has high-temperature stability, high damping performance, vibration absorbability, low-temperature toughness and environmental durability, stress buffering and energy dissipation of a photovoltaic structure system can be achieved, load damage to a photovoltaic module is effectively relieved, the fatigue resistance and vibration reduction capacity of a photovoltaic road are remarkably improved, and the service life of the photovoltaic road is prolonged. And thus, the overall service performance and life cycle of the photovoltaic road are remarkably improved.

The present application relates to the technical field of rubber sealing material, and particularly relates to a modified fluorine rubber, a preparation method thereof and a semiconductor sealing assembly. The preparation method provided by the present application comprises the following steps: mixing vinylidene fluoride, hexafluoropropylene, tetrafluoroethylene, long-chain modified flexible monomers and vulcanization point monomers in a predetermined proportion to obtain mixed monomers; mixing the mixed monomers, a solvent and a fluorine-containing surfactant, and then performing first stirring treatment to obtain a monomer pre-emulsion; mixing the monomer pre-emulsion, an additive and the solvent, and then performing second stirring treatment to obtain a product to be treated; placing the product to be treated at a first temperature, heating to a second temperature under predetermined conditions, and then performing reaction to obtain a reaction product; recovering the mixed monomers that do not participate in the reaction in the reaction product, adding a magnesium nitrate aqueous solution, performing third stirring treatment, and then drying to obtain the modified fluorine rubber. Under the premise of maintaining the excellent chemical resistance of the fluorine rubber, the present application significantly improves the elastic recovery performance of the fluorine rubber in a wide temperature range.

The application discloses an Inconel pipe gradient coating laser remelting micro-peening composite strengthening method and belongs to the technical field of metal material surface treatment. The application sequentially carries out mechanical sand blasting, ultrasonic cleaning and vacuum drying pretreatment on an INCONEL600 substrate. A pure nickel transition layer, a NiCrCoMo intermediate layer and an Al content gradient changing NiCrCoMo-Alx functional layer are deposited layer by layer by using a multi-target magnetron sputtering to form a three-layer composite gradient coating. The coating is subjected to laser remelting or micro-peening post-processing strengthening. The application relieves the thermal mismatch stress between the coating and the substrate, eliminates the internal porosity defects of the coating, introduces residual compressive stress, significantly improves the high-temperature hardness, wear resistance, corrosion resistance and high-temperature oxidation resistance of the coating, solves the problems of easy cracking, peeling and imbalance of strength and toughness of the traditional homogeneous coating, is suitable for long-acting protection of INCONEL600 pipes and containers under high-temperature and high-pressure working conditions in chemical refining, coal chemical industry and the like, prolongs the service life of equipment and improves the operation safety.