14 results about "Spray forming" patented technology

The invention discloses a preparation method for improving the corrosion resistance of a spray-formed aluminum alloy component, and belongs to the field of preparation of high-performance metal materials. According to the method, a high-frequency alternating magnetic field with specific parameters (such as the strength of 0.2 T-0. 8T and the frequency of 5kHz-50kHz) is synchronously applied in the deposition stage of spray forming, so that the magnetic field force acts on molten drops which are being solidified and a semi-solid layer. According to the method, nucleation, growth and spatial distribution of a nano precipitated phase and a nano dispersed phase are actively intervened in situ through magnetic field induced micro-area convection and interface energy regulation and control, so that the microscopic heterogeneity which is easy to cause corrosion is fundamentally optimized; compared with a conventional spray forming process without a magnetic field, according to the method, the corrosion current density of the 7075 aluminum alloy in a 3.5% NaCl solution can be reduced by about 60%, the pitting potential positive shift exceeds 80 mV, the service life of a component in a severe environment is remarkably prolonged, and the reliability of the component in the severe environment is remarkably improved.

The invention provides a manufacturing and performance verification method of a spray-formed aluminum alloy forge piece for a helicopter, and the method comprises the following steps: carrying out spray forming on uniformly mixed metal powder to obtain a spray-formed aluminum alloy ingot blank; carrying out extrusion hot processing on the spray-formed aluminum alloy ingot blank; forging the ingot blank subjected to extrusion hot processing; the forged forge piece is subjected to heat treatment; and carrying out performance verification on the forged piece subjected to heat treatment. The spray-formed aluminum alloy forge piece manufactured based on the method can meet the weight reduction design requirements of typical bearing frames and other parts of helicopters, structural weight reduction is achieved, and the development requirements of ultra-light structures and high specific strength are met.

The invention provides a semi-solid thixoforming method and system for a spray-formed aluminum alloy blank, and is applied to the technical field of aluminum alloy machining. The method comprises the following steps: heating a spray-molded aluminum alloy blank to a semi-solid temperature zone, so that the internal liquid phase fraction of the spray-molded aluminum alloy blank reaches 30-70%, and forming semi-solid slurry formed by coating solid-phase spherical particles with a uniform liquid film; placing the semi-solid slurry in a lower die of a forming die, and controlling an upper die of the forming die to press downwards by adopting a segmented pressure control process, so that the semi-solid slurry completes defect repair and forming in a closed cavity, and a deformed aluminum alloy forge piece is obtained; and the deformed aluminum alloy forge piece is cooled and solidified, and the target aluminum alloy forge piece is obtained. According to the method, precise forming of the aluminum alloy forge piece and synchronous elimination of microstructure defects are effectively completed, and the density, the mechanical property and the forming precision of the aluminum alloy forge piece are remarkably improved.

The application discloses a spray forming cold-rolled work roll blank and a preparation method thereof. By designing material components, the toughness of the base body is increased to meet the rolling requirement of ultra-high strength steel. Meanwhile, the spray forming technology is adopted, so that the prepared spray forming cold-rolled work roll blank has comprehensive improvement in normal temperature and high temperature mechanical properties, especially the high temperature toughness, wear resistance and heat crack resistance are greatly improved, so as to solve the peeling, uneven carbide and relatively insufficient wear resistance of the high-speed steel work roll prepared by ESR smelting and forging technology.

The present application belongs to the technical field of metal material processing, and relates to a densification process for spray forming high-strength aluminum alloy. After large deformation densification treatment of the spray forming ingot, subsequent solid solution treatment and aging treatment are carried out. The hot and force coupling is used to close the pores through plastic deformation and diffusion. The semi-finished product with excellent structure and density is obtained through large extrusion ratio or large deformation forging, the advantages of rapid solidification of spray forming are retained, the material is further strengthened and toughened through thermal mechanical treatment, the cost is reduced, the grain is refined, the comprehensive mechanical properties are improved, the internal loose defects of the high-strength aluminum alloy ingot prepared by spray forming are reduced, and finally the aluminum alloy material with tensile strength > 800 MPa and density > 99% is obtained. The applicable alloy composition is as follows: Cu 1.4-1.8%, Mg 2.2-2.6%, Zn 10.0-12.0%, Mn 0.02-0.05%, Zr 0.10-0.20%, Ti 0.02-0.05%, impurity element Si <= 0.10%, Fe <= 0.12%, other impurities <= 0.05% in total, <= 0.15% in total, and the balance is Al.

The utility model discloses a spray forming steel surface hardening post -treatment device, it includes work table, clamping assembly and cleaning component, the top fixed connection of work table has the guide, the output fixed connection of electric telescopic handle has clamping block, the cleaning component includes rotary disc, sliding support frame and motor, the sliding support frame slides on the guide, the inner wall fixed connection of rotary disc has damping rod, one side fixed connection of damping rod has brush, through above -mentioned structure, through the clamping assembly steady fixation work piece of four corners distribution, the compound motion of rotary disc rotation and sliding support frame horizontal movement in combination cleaning component, drive its inside circumference uniform distribution, have the brush close work piece surface of elasticity, and ensure brush rotation axis and work piece center axis alignment, have promoted the evenness and adaptability of cleaning action to work piece surface, effectively avoided the cleaning dead angle or uneven force.

The application discloses a homogenization process for super-high-strength aluminum alloy based on a pore evolution and thermal coupling simulation model and belongs to the technical field of metal heat treatment. In view of the problems of poor plasticity, high porosity and difficult organization regulation of a large-size super-high-strength aluminum alloy ingot prepared by spray forming, the application adopts a three-stage ladder homogenization, hot compression densification, thermal coupling simulation and two-stage solid solution and aging integrated process, establishes a quantitative model coupled with an Arrhenius constitutive equation, dynamic recrystallization and pore evolution, realizes the cooperative regulation of coarse precipitated phase dissolution, pore closure and organization refinement, shortens the homogenization cycle by more than 30%, reduces the residual porosity to less than 0.3%, increases the elongation by more than 50%, and is stable and excellent in mechanical properties. The simulation precision R is greater than or equal to 0.95, and the application is suitable for the preparation of large-size super-high-strength aluminum alloy components.

This invention discloses a heat treatment method for spray-formed aluminum-lithium alloys containing high lithium (Sc), comprising the following steps: Step 1: placing the spray-formed high-lithium (Sc) aluminum-lithium alloy ingot in a vacuum heat treatment furnace; Step 2: raising the furnace temperature from room temperature to 470-485℃ at a first heating rate, maintaining a core-to-surface temperature difference of less than or equal to 15℃ during the heating process; Step 3: holding the ingot at 470-485℃; Step 4: raising the furnace temperature to 495-500℃ at a second heating rate; Step 5: performing a two-stage holding treatment at 495-508℃; Step 6: progressively cooling the high-lithium (Sc) aluminum-lithium alloy ingot after the holding period. This invention solves the problems of poor alloy toughness and easy cracking during processing caused by low-melting-point phases, avoids abnormal phase coarsening caused by excessive diffusion of Sc, and significantly improves the overall rationality and stability of the phase structure.

The high-strength and high-toughness martensitic stainless steel comprises the following alloy components in percentage by mass: less than or equal to 0.05 percent of C, 13.0 to 14.8 percent of Cr, 1.2 to 1.6 percent of Mo, 1.0 to 1.4 percent of V, 0.5 to 1.2 percent of Ti, 4.8 to 5.6 percent of Ni, 0.3 to 0.6 percent of Si, 0.4 to 0.7 percent of Mn, 0.05 to 0.10 percent of Nb, 0.0015 to 0.003 percent of Ca, less than or equal to 0.025 percent of N, less than or equal to 0.010 percent of P, less than or equal to 0.002 percent of S and the balance of Fe and inevitable impurities. The preparation method of the high-strength and high-toughness martensitic stainless steel for precise spray forming comprises the steps of raw material drying pretreatment, smelting refining, precise spray forming, hot forging densification, multi-stage heat treatment and finishing detection. In this way, the martensitic stainless steel with both strength, toughness and corrosion resistance can be obtained, and the use requirement of high-end equipment is met.

This invention discloses a cold spraying molding method for the outer wall of a combustion chamber, comprising the following steps: S1, filling with filler: first, milling grooves in the inner wall of the substrate to form grooves, and then cleaning and drying them, then filling the grooves with conductive filler until they are flush with the top surface of the grooves, and obtaining the substrate surface after the conductive filler solidifies; S2, cold spraying a pure copper layer: after cleaning and drying the substrate surface, cold spraying pure copper powder onto the substrate surface to form a pure copper layer; S3, cold spraying a pure nickel layer: after cleaning and drying the pure copper layer, cold spraying pure nickel powder onto the surface of the pure copper layer to form a pure nickel layer; S4, removing filler; The cold spraying technology used in this invention has no high-temperature process, avoiding the softening of the inner wall material and residual thermal stress during the deposition process, resulting in high bonding strength; high deposition rate, greatly shortening the manufacturing cycle of the outer wall of the combustion chamber.

The present disclosure relates to a spray forming method for producing metal ingots and metal powder from a metal source of a metal or a metal alloy, comprising the steps of forming one or more streams of a metal or a metal alloy from the metal source, gas atomizing the one or more streams of a metal or a metal alloy to form a spray of one or more atomized droplets, guiding the spray of droplets through a nozzle to a rotatable hot body, depositing the droplets to the hot body to form an ingot, controlling the process parameters 1) temperature of the metal or the metal alloy, 2) inlet and outlet pressure of the nozzle, 3) rotation speed of the hot body, and / or 4) distance between the hot body and the spray of droplets, and collecting a metal powder having a predefined particle size distribution, wherein the process parameters are controlled such that the ingot yield is 60% to 80% and the metal powder yield is 40% to 20% respectively relative to the metal source.

A method for manufacturing a part by spray forming, comprising: spraying a soft magnetic composite material from a nozzle into a mold; and adjusting the position of the mold relative to the position of the nozzle to control deposition of the soft magnetic composite material into the mold. The adjusting is performed by mounting the mold on a stage such that the mold is movable relative to the nozzle and such that the spraying is controlled to provide deposition of the soft magnetic composite material such that a near-net-shape part is formed.

The invention discloses a cooling device for spray forming of an aluminum-lithium alloy, and relates to the technical field of aluminum-lithium alloy cooling, according to the technical scheme, the cooling device comprises a cooling shell, a first motor is arranged on the upper portion of the cooling shell, a short arm and a first transmission wheel are arranged at the output end of the first motor, the short arm is rotationally connected with a long arm, and the long arm is rotationally connected with a first gear; the first motor is fixedly connected with a first gear, the first gear is rotatably connected with the cooling shell, the first gear is connected with a second gear in an engaged mode, the second gear is fixedly connected with a main pipe, and the main pipe is rotatably connected with the cooling shell, in the cooling process, the short arm and the first transmission wheel can be driven to rotate by starting the first motor, and the main pipe can be driven to swing in a reciprocating mode through rotation of the short arm; and the first transmission wheel rotates to drive the second fan blades to rotate, and gas generated in the cooling process can be sucked into the second collection tank through rotation of the second fan blades.

The application discloses a spray forming 7xxx series alloy powder by-product recycling method based on DED additive manufacturing and application thereof, and belongs to the technical field of material preparation, and comprises multi-stage screening, drying treatment, powder mixing, DED laser additive manufacturing and heat treatment of the spray forming 7xxx series aluminum alloy powder by-product; the method can convert the 7xxx series waste powder generated in the spray forming process into a high-value-added powder for additive manufacturing, thereby reducing energy loss and production cost of aluminum powder preparation, reducing environmental pollution of the spray forming aluminum powder by-product, and achieving the advantages of high tensile strength, high elongation and high alloy density. 0.2 .