4results about How to "Uniform plastic deformation" patented technology

The invention discloses a cavitation shot peening surface strengthening method and system based on cooperation of high hydrostatic pressure and spherical focused ultrasound. The method comprises the following steps: establishing and maintaining a hydrostatic pressure environment higher than 0.1 MPa in a high-pressure processing cavity filled with a degassing liquid medium; the to-be-machined surface of the workpiece is positioned in a sound field focal region of the spherical focused ultrasound transducer; and in the high hydrostatic pressure environment, a transducer is driven to work so as to generate a cavitation bubble group in a space confinement range in a focal region of the transducer, and meanwhile, the workpiece is controlled to move according to a preset path, so that cavitation collapse impact acts on a target region on the surface of the workpiece. The device comprises a high-pressure processing cavity, a spherical focused ultrasonic transducer, a multi-degree-of-freedom movement mechanism and a control system. Through cooperation of high hydrostatic pressure constraint and the spherical focusing sound field, precise localization and energy strengthening of the cavitation effect are achieved, a plastic deformation layer can be efficiently and controllably introduced to the surface of a metal material, the surface hardness can be remarkably improved, a residual compressive stress layer is formed, surface layer grains are refined, and the method is suitable for precise surface strengthening of complex components.

This invention relates to a hot-rolled wire rod for 2330MPa grade stranded wire and its manufacturing method. The method involves rolling high-carbon, high-silicon Cr-V wire rods into wire rods, followed by online molten salt isothermal toughening treatment. This process involves a pre-treatment molten salt stage followed by rapid cooling, transitioning the wire rod from an austenitic state to a sorbite phase, forming a predominantly sorbite microstructure. A subsequent molten salt stage further increases the molten salt temperature and reduces the molten salt circulation rate, promoting the continued transformation of untransformed residual austenite into sorbite and isothermal tempering, while also promoting partial melting of sorbite lamellars. Finally, the wire rod undergoes slow cooling on a roller conveyor, resulting in a hot-rolled wire rod with a microstructure consisting of tempered sorbite, ferrite, and melted sorbite. This method controls material costs, achieving a tensile strength of 1558~1608MPa and a reduction of area of ​​34%~39%, while balancing production efficiency and energy consumption. It eliminates the need for offline heat treatment, enabling efficient and stable production of ultra-high strength stranded wire.

The application discloses a process method for rivet buckling and pressure riveting of a main plate of a heat exchanger, and relates to the technical field of heat exchanger manufacturing in a new energy automobile thermal management system. A servo pressure riveting device with a longitudinal ultrasonic excitation function is adopted, a flat head sinking type pressure riveting connection is performed on the main plate and the flow channel plate after pretreatment and coating through multi-stage variable pressure control, ultrasonic energy is synchronously applied during pressure riveting, shear thinning and self-adaptive flow leveling of the pre-coated heat conduction coating medium are caused, the resident air in the microscopic rough gap of the interface is discharged, and internal residual stress is eliminated through the acoustic plastic softening effect of the material. The application has the advantages that the ultrasonic auxiliary pressure riveting process is combined with the preposition of the phase change heat conduction coating medium, the acoustic control and thermal effect of the ultrasonic wave promote the self-adaptive flow leveling of the heat conduction medium, and the air micro gap remaining in the traditional buckling riveting is completely eliminated. Quantitative comparison tests show that.

The invention relates to a cold-press forming and heat treatment method for a spherical composite metal plate. The method comprises the steps of cold-press forming of the spherical composite metal plate, detection after cold-press forming, charging and heat preservation of a heat treatment part, discharging and air cooling of the part, and inspection after heat treatment. The plate is subjected to annular cold pressing from the edge to the center according to preset parameters in stages, gradual uniform plastic deformation of the plate is achieved, and local stress concentration and elastic resilience are remarkably reduced. And in combination with detection after cold pressing forming, the problems that precision control is difficult and the rebound amount is large in the spherical composite metal plate machining process are fundamentally solved. And meanwhile, the heat treatment process is optimized, the residual stress of the spherical composite metal plate is fully released, and then the forming precision and the surface quality of the spherical composite metal plate subjected to heat treatment are improved.