7results about How to "Retention strength" patented technology

The invention relates to the technical field of automobile plate materials, in particular to a composite automobile outer plate and a preparation method thereof.The composite automobile outer plate comprises a resin glass fiber laminated plate and a polypropylene outer layer which are hot-pressed together, a transition layer is arranged between the resin glass fiber laminated plate and the polypropylene outer layer, and a three-layer composite structure of functional layering and gradient transition is adopted; the performance bottleneck of a traditional single material is broken through, the total thickness of the three layers is 2.5-3.0 mm, the thickness of the three layers is equal to that of a traditional steel plate outer plate, but the weight is reduced by more than 70%, and the structural advantages of equal strength, half weight and controllable cost are achieved.

The invention relates to the technical field of production of vacuum insulated panel core materials, in particular to a preparation method of a vacuum insulated panel core material, which comprises the following steps: cutting raw materials by using an airflow feeding type section cutting machine, opening and mixing filaments, carding to form a net, laying the net to form a felt, hot-pressing and shaping, and cutting. According to the preparation method provided by the invention, a dry process is adopted, so that severe hydraulic shearing and mechanical friction damage to fibers caused by wet pulping are avoided; the step of cutting off the raw materials is carried out by adopting the airflow feeding type section cutting machine, the to-be-cut ends of the glass fiber filaments are downwards suspended in a discharging cavity and are attached to structures such as a second feeding roller by utilizing airflow before cutting, cutting point drifting caused by curling and bending of the fibers is effectively avoided, and the cutting efficiency is improved by being matched with cutting of a cutting knife. The length of the short cut filaments is strictly controlled within a required range, the length distribution of the short cut filaments is concentrated, and the problem that the pore uniformity of the core material and the stability of the heat insulation performance of a final product are affected due to non-uniform length of the short cut fibers is solved.

This invention proposes a brazing method for aluminum alloys based on surface activation and a pre-placed Ni layer. The method includes: Step 1, pre-treating the aluminum alloy surface to be brazed to ensure it is dust-free and oil-free; Step 2, subjecting the aluminum alloy surface to ion bombardment to remove the oxide film and activate the surface; Step 3, depositing a Ni thin film on the aluminum alloy surface to form a pre-placed Ni layer; Step 4, assembling the aluminum alloys to be brazed and placing them in a vacuum brazing furnace, with the Ni layers of the two aluminum alloys in contact. Pressure is applied to ensure the upper and lower aluminum alloys are tightly bonded and to prevent relative sliding. The furnace is then vacuum-heated to 540℃~585℃ and held for a preset time before cooling to room temperature to obtain an aluminum alloy / Ni / aluminum alloy brazed joint. The joint obtained by this surface-activated, pre-placed Ni layer-based aluminum alloy brazing method has the characteristics of no oxide film at the interface, high tensile strength, and low deformation rate.

The application discloses a multi-curvature optimized drag-reducing lateral thruster flow guide groove, and the opening (5) of the lateral thruster (1) is designed in the form of a horn-shaped flow guide groove (6). The application is based on the large-curvature characteristics of a ship line, and according to the water flow direction and the transverse gradient of the opening end, different chamfer angles are designed at different positions, multi-curvature transition and optimization are applied, and a multi-curvature optimized drag-reducing lateral thruster flow guide groove is designed. The application has the advantages that the cutting amount of the structure is reduced, the strength of the structure is retained, and the safety of the structure is ensured. According to the comparison of CFD software, under the specific speed working condition of the actual ship, the flow guide groove of the application reduces the pressure near the side thruster opening, and the overall ship resistance is reduced by 3.2%.

Provided is a polyamide core-sheath composite fiber comprising a sheath polymer formed from polyamide and a core polymer formed from polyether ester amide copolymer, wherein the core-sheath composite fiber has a strength of 3.6 cN / dtex or greater, a cross-sectional uniformity ratio d / R of the core-sheath component in the entire yarn of 0.072 or less, and an electrical specific resistance of 107 to 1010 Ω·cm. The provided polyamide core-sheath composite fiber has a humidity-absorbing property and an antistatic property, and while retaining strength, suppresses generation of fluff and has excellent high-order passability.

This application relates to an aluminum alloy structural frame, comprising multiple connectors and multiple aluminum alloy beams and columns. Each connector has multiple sets of tenons. Both ends of each aluminum alloy beam and column have mounting holes for mates with the tenons. Each aluminum alloy beam and column is equipped with a pin. The surfaces of both the beams and columns and the tenons have pin holes for mates with the pins. The connectors are connected to the aluminum alloy beams and columns via the tenons and pins. This application employs a prefabricated tenon-to-mounting-hole interlocking mechanism, combined with the lateral locking of the pins, to achieve rapid positioning and installation. The reversible pin connection method offers greater detachability compared to bolt connections, allowing for the replacement of partial components without overall disassembly. The insertion of the pins is simple and much faster than tightening multiple bolts or welding, facilitating user replacement, saving time and effort, and improving installation and replacement efficiency.

The utility model discloses a kind of pretreatment equipment for high-strength steel cable processing, it includes processing box, derusting box, cleaning tank and drying oven, the inside of the pretreatment box is provided with pretreatment cavity, fixed roller is rotated in the pretreatment cavity, three sector nozzles are fixedly connected in the both sides of the bottom of the pretreatment cavity, the bottom of the pretreatment cavity is provided with chute;The inside of the derusting box is provided with derusting cavity, inner cavity is provided in the derusting cavity, vibrator is fixedly connected outside the inner cavity, the inner cavity is filled with ceramic beads of specific particle size and hardness, and the abrasive made of ceramic beads is impacted and derusted by vibrator vibration, instead of traditional pickling process, while completely stripping the surface scale and rust layer of steel cable, the derusting mechanism can remove impurities in-depth steel cable gap, and no scratch is generated, the strength and tensile property of high-strength steel cable are completely retained, solve the problem of environmental hazards of chemical derusting.