30results about How to "Meet the needs of specific occasions" patented technology

The invention relates to a preparation method for a refined magnesium alloy solidification tissue, which is suitable for preparing thin wall magnesium alloy structural components of high requirements and complicated performance in the industrial fields of automobiles, communication electronics, aerospace and the like. The preparation method comprises the following steps of: adding magnesium alloy raw materials cleaned by using acetone into a crucible resistance furnace; adding a refining agent for refining after smelting under the protection of mixed gas of tetrafluoroethane (CH2F4) and CO2 and maintaining the temperature for 20min; uniformly stirring and mixing; maintaining the temperature for 20min when the melt temperature reaches the smelting temperature again; pouring the smelted magnesium alloy melt into a high-speed rotating metal casting mold in a vertical centrifugal field; stopping the centrifugal rotation after the pouring is completed for 20min; and taking out when a magnesium alloy casting is cooled to the room temperature to prepare the magnesium alloy casting. The preparation method refines the solidification tissue of a magnesium alloy, enhances the performance of the casting and enlarges the application field of the magnesium alloy casting.

The invention provides a novel manual electromagnetic material which comprises a piece-shaped substrate and at least one pair of artificial micro-structures. Each pair of artificial micro-structures comprises a first artificial micro-structure and a second artificial micro-structure which are adhered to the substrate, and a plurality of artificial micro-structures are arranged on the piece-shaped substrate in an array mode. Two harmonic peaks are obtained through two different artificial micro-structures, and smooth gradual change of epsilon from zero can be achieved between the two harmonic peaks. In addition, according to comparison of simulated images, we can know that the size of the artificial micro-structures can enable the harmonic peaks to move forward or backward in a certain frequency range, and then a smooth gradual-changing frequency range of a dielectric constant from zero is adjusted, wherein a change rule is specifically that the harmonic peaks move backward if size of the artificial micro-structures is decreased; and the harmonic peaks move forward if size of the artificial micro-structures is increased.

The invention discloses a high-strength heatproof and soundproof door which comprises a frame, an inner heatproof layer, an outer heatproof layer, an inner side plate and an outer side plate, wherein the inner heatproof layer and the outer heatproof layer are connected with an inner side frame of the frame; a soundproof space is formed between the inner heatproof layer and the outer heatproof layer; the inner side plate is covered on the surface of the inner heatproof layer, and welded with the frame; and the outer side plate is covered on the surface of the outer heatproof layer, and welded with the frame. An aluminum alloy prepared by a formula serves as the frame, the inner side plate and the outer side plate, so that the overall strength of the door is greatly improved, and the heat resistance is better; and glass prepared by the formula serves as the inner heatproof layer and the outer heatproof layer, so that a heatproof effect is very good, and a soundproof effect is excellent. Therefore, the door has high strength, has heatproof and soundproof functions, and fully meets a special occasion demand.

The invention discloses a method for preparing a small-aperture magnesium alloy pipe fitting. The method comprises the following steps of: putting a qualified magnesium alloy straight pipe raw material pipe into a band sawing machine, and processing a standard magnesium alloy straight pipe blanket according to a material preparation size; uniformly smearing a lubricating agent, preheating to 60 to 100 DEG C, and keeping the heat for 10 to 20min; quickly putting the preheated magnesium alloy straight pipe blanket into a bent pipe cold-pushing forming machine, starting a jacking rod to gradually pressurize the magnesium alloy straight pipe blanket, when a magnesium alloy straight pipe reaches a required bent angle, opening a die, and taking the pipe blanket down; performing destressing and annealing on the bent pipe blanket, and finally taking out the pipe blanket to prepare the magnesium alloy pipe fitting. By the method, the texture compactness and uniformity of the magnesium alloy pipe fitting are improved, and the mechanical property of the pipe fitting is improved; and the method is particularly suitable for preparation of high-quality and small-size magnesium alloy pipe fittings required in the industrial field such as aerospace, automobiles, 3C products and nuclear power.

The invention discloses a braze welding process for a hard alloy and low-alloy and high-strength steel, which belongs to a braze welding method for high-strength base steel. The method comprises the following steps of: preparing the low-alloy and high-strength steel, the hard alloy and a manganese brass flaky brazing filler metal qualified in raw material inspection; removing oxide layers on the surfaces of the low-alloy and high-strength steel, the hard alloy and the manganese brass flaky brazing filler metal with sand paper; coating a soldering flux QJ-302 on the two faces of the brazing filler metal; placing the brazing filler metal between the low-alloy and high-strength steel and the hard alloy; fixing by using a clamp; placing into a KSL-1100X box type furnace; setting the heating speed at 10 DEG C per minute; heating till the solidus temperature of the brazing filler metal is 909 DEG C, and preserving heat for 30 minutes; setting a heating speed at 9 DEG C per minute; heating to 960 DEG C, and preserving heat for 10 minutes; cooling to 300 DEG C, and preserving heat for 30 minutes; and performing furnace cooling to the room temperature to obtain a weldment. The hard alloy is welded on the surface of the low-alloy and high-strength steel, so that the surface hardness and wear resistance of the low-alloy and high-strength steel can be enhanced, the mechanical property and mechanical performance are improved, and the application fields of the low-alloy and high-strength steel and the hard alloy are expanded.

The invention relates to a novel metamaterial which comprises at least one material plate layer. Each material plate layer comprises a substrate and artificial microstructures attached onto the substrate. The substrate is virtually divided into a plurality of substrate units arranged in array mode. A pair of artificial microstructures is attached onto each substrate unit. First artificial microstructures are of snowflake-shaped structures. Each second artificial microstructure comprises a first open ring structure, a second open ring structure and an I-shaped structure. Each I-shaped structure comprises a first metal line, a second metal line and a third metal line, wherein the first metal line and the second metal line are parallel to each other, and two ends of the third line are connected with the first metal line and the second metal line respectively. The third metal lines penetrate through the first open ring structures and the second open ring structures. The material has broadband high dielectric constant in a certain frequency band, has distribution of dielectric constants gradually increasing from zero in another frequency band and can meet requirements of a specific situation.

Disclosed is a transformable motorcycle frame which is formed by combining a left frame, a linkage mechanism, a right frame, connecting shafts and a connecting square block. The left frame and the right frame are of an independent structure in mirror symmetry and are connected to form a firm spatial frame structure under simultaneous connecting action of a crossed connecting shaft, the connecting square block, a main connecting block, a rear connecting shaft and a lower connecting shaft; the linkage mechanism is mounted between the left frame and the right frame by utilizing the crossed connecting frame, a bottom fork connecting shaft and the main connecting shaft and composed of the crossed connecting shaft, a bidirectional hydraulic cylinder, a hydraulic power unit, a pull rod, a rocker arm, a single damper and a bottom fork; under acting force of extension and contraction of the hydraulic cylinder, an included angle between central axis of a vertical pipe of the crossed connecting shaft and the horizon and an included angle between a plane on which the bottom fork is positioned and the horizon are increased or decreased at the same time, and barycenter of a motorcycle body is lifted or lowered accordingly, so that front-wheel dragging distance of a motorcycle is changed, shape of the motorcycle is changed as well, driving posture is changed, and driving fatigue is relieved.

The invention discloses a high-temperature-resistant flame-retardant composite material, which includes component A and component B, and the dosage ratio of each component is calculated in parts by mass: component A: 80-90 parts of organic fluorine silicon modified polyurethane, 1-5 parts Parts of polytetrafluoroethylene micropowder, 1-5 parts of antimony trioxide, 5-10 parts of hexafluoropropylene trimer, component B: 5-10 parts of polycarbodiimide, 1-5 parts of hexafluoroisopropanol , 90-95 parts of hexafluoropropylene trimer, and specifically define the preparation method of organic fluorine silicon modified polyurethane. The invention also discloses its preparation method and application. The composite material of the present invention has high heat-resistant and flame-retardant properties. The composite material is sprayed on a wooden board, and the composite material is subjected to a combustion test at a high temperature of 1000°C. The flame is extinguished within 30 seconds, and no combustibles fall, reaching the flame-retardant standard V -Level 0. The composite material of the invention has better physical properties at the same time. As a paint sprayed on the wood board, the wood board has good flame retardancy, so as to meet the needs of specific occasions.