8results about How to "Improve performance uniformity" patented technology

This invention discloses a method for controlling the uniformity of gear steel microstructure, including hot metal desulfurization and vanadium extraction, semi-steel converter smelting, LF refining, RH refining, and continuous casting processes. The method controls the solidification process of the molten steel in the molten pool during continuous casting, ensuring solidification is completed within a 1 / 4 arc-shaped region of the slab, and implementing a specified cooling and solidification control process. This method effectively improves the macroscopic solute concentration uniformity in all directions of the cross-section of the gear steel continuous casting slab, improves the regional symmetry of the solidified microstructure, and promotes more uniform phase transformation and stress distribution in the gear microstructure during gear processing and subsequent heat treatment. The range of distance between the equiaxed crystal zone boundary and the slab surface is reduced from 30-40 mm to 10-15 mm. After rolling into a round bar, the range of distance between the equiaxed crystal trace zone boundary and the round bar surface is controlled to ≤5 mm, and the range of solute segregation (circumferential) at the same radial distance from the surface of the round bar is ≤0.02. The resulting gear steel grain size stabilizes from grade 6.0-7.0 to grade 7.0.

This invention discloses a rapid design method for low-sidelobe reflector antennas applied to complex requirements, comprising the following steps: S1: Calculate the initial focal coordinates of the long-axis reflector based on the structural parameters of the long-axis reflector, and calculate the half-angle of the main reflector and the distance from the feed to the vertex of the sub-reflector; S2: Calculate the initial focal coordinates of the short-axis reflector based on the principle of equal optical path length; S3: Introduce a coefficient set to construct a normalized focal distribution feature; S4: Keep the focal points fixed and dynamically reconstruct the focal distribution of the long and short axes within the full illumination angle range; S5: Calculate the coordinates of the main reflector and the sub-reflector; S6: Iteratively adjust the boundary focal points and the coefficient set to converge and obtain a reflector antenna that meets the low-sidelobe index. This invention has strong adaptability and extremely low algorithm freedom, with only 7 degrees of freedom; it can quickly achieve high-performance optimization of complex reflectors, perfectly adapt to irregularly shaped reflector antennas with large aspect ratios, and solve the design problem of asymmetric structures.

This application provides a quenched and tempered steel plate and its production method. The quenched and tempered steel plate comprises the following components by mass percentage: C: 0.15–0.20%; Si: 0.20–0.40%; Mn: 1.20–1.50%; Cr: 0.20–0.50%; Ni: 0.10–0.20%; Nb: 0.020–0.040%; Ti: 0.010–0.040%; Mo: 0.30–0.50%; B: 0.0010–0.0025%; P≤0.015%, S≤0.004%; N≤0.004%, Als: 0.010–0.060%, with the remainder being Fe and unavoidable impurities. This application manufactures a thick, high-strength quenched and tempered steel plate with high surface quality by adjusting the elemental composition and content of the quenched and tempered steel plate, specifically by adding certain amounts of Ni, Cr, and B.

This invention discloses an irradiation crosslinking device for the production of special cables using irradiation crosslinking technology, comprising a housing (1), an electron accelerator irradiator (2) located in the upper part of the housing (1), reflective magnet structures (3) located on both sides below the ray outlet of the electron accelerator irradiator (2) located inside the housing (1), an air outlet (4) located on the side of the electron accelerator irradiator (2) located in the upper part of the housing (1), an ozone adsorption component (6) located at the air outlet (4), and a cold air curtain structure (5) located on the wire inlet side of the housing (1), with the air outlet of the cold air curtain structure (5) forming an angle of 25-40° with the wire core axis. This invention has the characteristics of effectively improving irradiation uniformity and reducing thermal effects.

The application discloses a fractal structure functional integration heat protection system containing composite phase change material, which comprises a fractal structure web plate fixedly arranged on the inner side of an outer plate, an inner plate fixedly arranged on the lower side of the fractal structure web plate, an intermediate partition plate fixedly arranged on the fractal structure web plate between the outer plate and the inner plate, a cavity between the intermediate partition plate and the outer plate filled with a heat insulation material, and a cavity between the intermediate partition plate and the inner plate filled with the composite phase change material. Through the synergistic effect of the nano wetting effect of the modified low-melting-point metal-based alloy and the micron-level framework of the expanded graphite, a "alloy-graphite" two-stage heat conduction network is constructed, the heat conduction coefficient is greatly improved, the heat of the fractal structure web plate can be quickly transmitted to the composite phase change material for storage, the problem of heat short circuit does not occur, the heat protection performance and temperature uniformity are improved, and a reliable guarantee is provided for the safe flight of the aircraft in the environment with serious aerodynamic heating.

This application discloses a thickened steel pipe sleeve, its heat treatment method, and its application, belonging to the field of metallic materials technology. The method includes: subjecting the thickened sleeve forming part to a first-heated sleeve by quenching at a temperature of 880-900℃; subjecting the first-heated sleeve to a first-water quenching to obtain a first-water-quenched sleeve; subjecting the first-water-quenched sleeve to a second-heated quenching at a temperature of 920-940℃; subjecting the second-water-quenched sleeve to a second-water quenching to obtain a second-water-quenched sleeve; cooling the primary and secondary sleeve bodies with external spraying and internal spraying, and cooling the thickened end with external spraying, internal spraying, and supplementary water; the external spraying flow rate is 2800-3200 m³ / h; the internal spraying flow rate is 1000-1500 m³ / h; and the supplementary water flow rate is 400-600 m³ / h. 3 / h; The secondary heating and tempering treatment of the sleeve yields a thickened steel pipe sleeve. The yield strength and tensile strength deviation of the tube body and the thickened end of the thickened sleeve after heat treatment in this application are ≤30MPa.

This invention discloses an aluminum alloy sheet / strip and its heat treatment method, including a solution treatment step, a graded quenching step, and an aging treatment step. The graded quenching step includes a slow cooling stage, an isothermal stage within the quenching precipitation-sensitive temperature range, and a rapid cooling stage. This invention, through graded quenching followed by slow cooling after solution treatment, isothermal treatment within the quenching precipitation-sensitive temperature range to achieve a discontinuous and discrete distribution of grain boundary precipitates, and rapid cooling, effectively reduces the internal residual stress of aluminum alloy sheets / strips with a thickness of 30-80 mm, improves corrosion resistance, and enhances the uniformity of performance in the thickness direction. The prepared aluminum alloy sheet / strip exhibits a core tensile strength not less than 90% of the surface tensile strength, a surface residual compressive stress greater than 50 MPa, and intergranular corrosion resistance reaching PC level, demonstrating excellent overall performance.

This invention relates to the field of metal surface cladding technology, specifically disclosing a method for controllable distribution of ceramic reinforcing phase in a metal-based cladding layer and the metal-based cladding layer itself. The invention involves preparing a pre-layer on the surface of a metal substrate; the material of the pre-layer includes a ceramic reinforcing phase or its corresponding raw material; metal-based alloy powder is clad onto the surface of the pre-layer, and during the cladding process, the pre-layer is melted to form the metal-based cladding layer. By employing the unconventional process sequence of "pre-preparing the ceramic reinforcing phase layer and then cladding the metal-based alloy powder," the density difference between the ceramic reinforcing phase and the molten metal, as well as the directional solidification characteristics of the molten pool, are actively utilized to achieve homogenization using physical laws. This results in a general improvement in the hardness and wear resistance of the lower part of the cladding layer, a significant improvement in performance uniformity, and a substantial increase in the service reliability of the metal-based cladding layer under harsh, high-wear conditions.