10results about How to "Good extrudability" patented technology

The invention relates to the technical field of concrete preparation, in particular to solid waste based 3D printing concrete which comprises the following raw materials: cement, mineral powder, modified tungsten tailings, water glass, steel slag, tungsten tailing sand, composite fibers, dispersible latex powder, a water reducing agent, an early strength agent, a retarder and water. The preparation method comprises the following steps: mixing the cement, the mineral powder and the modified tungsten tailing powder to obtain a cementing material component A; mixing steel slag, tungsten tailing sand, dispersible latex powder, an early strength agent, a retarder and composite fibers to obtain a solid component B; adding a water reducing agent and water glass into water, diluting and uniformly stirring to obtain a liquid component C; adding the solid component B and part of the cementing material component A, stirring, then adding part of the liquid component C, mixing, adding the rest of the cementing material component A, adding the rest of the liquid component C, and stirring again to obtain the 3D printing concrete. The prepared concrete is good in mechanical property, and solid waste cooperative treatment is achieved.

This invention discloses a method for constructing thin-walled components based on cement-based 3D printing, comprising the following steps: Step S1, placing cement-based material into the extrusion equipment of a concrete 3D printer; the extrusion equipment is equipped with a first temperature control system, which controls the temperature inside the extrusion equipment to 10℃±5℃; Step S2, setting the printing parameters of the extrusion equipment according to the model of the thin-walled component, and printing layer by layer from bottom to top on the printing platform using 3D printing technology to form an initial component; the printing platform is equipped with a second temperature control system, which is used to control the temperature of the cement-based material printed on the printing platform; Step S3, curing the initial component on the printing platform at 45℃±5℃ to obtain the thin-walled component. The construction method of this invention is applicable to printing thin-walled components in any temperature and humidity environment, with more than 100 stacked layers and a stacking height of more than 1m, and the resulting printed component has a stable structure.

The invention belongs to the technical field of aluminum alloy extruded profiles, and relates to a high-strength aluminum alloy profile with low quenching sensitivity and good bending performance and a preparation method thereof. According to the method, the strengthening effect of the aluminum alloy profile is optimized by controlling the formation of the beta phase and the Mg / Si ratio, especially in the peak aging state, the performance of the material in a bending test is improved by avoiding Si excess and reducing the risk of grain boundary embrittlement, and the tensile strength of the aluminum alloy profile is improved by reasonably selecting and controlling the adding amount of alloy elements (Mn, Zr, Sn and Cu). The bending performance, the surface quality and the extrudability are comprehensively optimized, the yield strength of the prepared aluminum alloy profile is larger than or equal to 350 Mpa, the bending angle in the L direction can be larger than 70 degrees, and the bending angle in the T direction can be larger than 50 degrees.

The invention provides a 7-series aluminum alloy backward extrusion automobile bar production method which comprises the steps of burdening, casting, cast bar homogenization, extrusion, bar quenching, stretching and cutting, aging treatment and the like, a first-stage homogenization system and a second-stage homogenization system are adopted in cast bar homogenization, in the extrusion process, a backward extrusion die comprises a rear chamber and a working belt which are connected in sequence, and the working belt is provided with a first-stage homogenization system, a second-stage homogenization system and a second-stage homogenization system. The rear chamber comprises a first conical area, a cylindrical area and a second conical area which are sequentially connected. By optimizing the alloy components, improving the casting process, adjusting the structural design of the die and accurately controlling the extrusion process parameters, the continuous online quenching production is realized, the surface quality defects are obviously reduced, the rejection rate and the production cost are reduced, and the production efficiency is improved.

The present application relates to the technical field of aluminum alloy production and processing, and particularly relates to an easily-extruded high-strength corrosion-resistant aluminum alloy, a manufacturing method thereof and an application thereof. The present application realizes the purpose of improving the material performance by using a higher Zn element while ensuring the corrosion resistance of the material by reasonably adjusting the proportion of Mg, Si and Zn elements. This method can not only improve the strength of the aluminum alloy, but also improve its corrosion resistance, thereby solving the problem of adding a large amount of alloy elements in the prior art, reducing the production cost and the difficulty of alloy element recovery. By controlling the alloy composition and the total aluminum content, the present application ensures that the extrusion deformation resistance of the aluminum alloy is small, has excellent extrudability, and controls the content of some elements to reduce the quenching sensitivity, so that the alloy can produce more complex thin-walled section shapes. The aluminum alloy material of the present application can still maintain good corrosion resistance in a high-humidity and high-salinity environment.

The invention belongs to the technical field of aluminum alloy extruded profiles, and relates to a 6-series high-strength aluminum alloy profile with high extrudability and a preparation method of the 6-series high-strength aluminum alloy profile. According to the aluminum alloy profile, the good extrudability of the aluminum alloy profile is kept by limiting the content of Mg and Li, the aluminum alloy profile can be machined into various complex shapes under the low pressure, the design possibility is widened, the production cost is greatly reduced, the production efficiency is greatly improved, and the aluminum alloy profile is particularly important for large-scale industrial production. In addition, the aluminum alloy profile further has excellent mechanical properties including excellent ductility and fatigue resistance, the stable performance under the dynamic load is ensured, and the service life of the product is prolonged. And meanwhile, the composite material also has good corrosion resistance and surface treatment performance, can effectively resist the influence of the external environment, and enhances the durability while keeping attractive appearance.

The invention discloses a device and method for preparing a magnesium alloy wire. The device comprises a heating cabin, an extrusion unit and a wire mold. The extrusion unit is arranged in the heating cabin, a blank to be extruded is arranged in the extrusion unit, an outlet is formed below the extrusion unit, and the wire mold is mounted at the outlet below the extrusion unit. The device and the method in the technical scheme both reflect innovation and practicability. The device is reasonable in design and complete in function, and powerful support is provided for preparation of the magnesium alloy wires; according to the method part, high quality and stability of the wire are ensured through a scientific technological process and strict management and control measures. The preparation process is expected to have good economic benefits and application prospects in the market.

The invention provides a 3D printing concrete material containing a composite filler and a preparation method of the 3D printing concrete material. The 3D printing concrete material is prepared from the following components: a cementing material, fine aggregate, coarse aggregate, a water reducing agent, the composite filler and water, the composite filler is prepared by adopting a method comprising the following steps: (1) uniformly stirring water-absorbent resin, polyacrylamide and cellulose ether; (2) putting the composite filler precursor obtained in the step (1) into water, adding flaky clay, fully stirring, and drying into powder; and (3) adding the composite filler intermediate obtained in the step (2) into a water-based polymer monomer and a curing agent, and uniformly stirring. The 3D printing concrete material containing the composite filler can automatically fill the internal defects caused by a printing process in a printing forming stage, the internal microstructure compactness of the 3D printing concrete is improved after the 3D printing concrete is hardened, and the mechanical and anti-permeability properties of the hardened 3D printing concrete are improved.

The application provides a kind of anti-freezing high-performance concrete for building 3D printing and a preparation method thereof, the concrete contains cement 80-100 parts by mass, fly ash 80-100 parts, slag powder 220-270 parts, silica fume 15-30 parts, fine aggregate 1200-1500 parts, and polycarboxylic acid high-performance water reducing agent, thickening agent, polypropylene fiber and / or modified cellulose ether, water-binder ratio 0.55~0.67, fine aggregate is natural sand, granite waste sand or mixture thereof, replacement rate 0%~100%. During preparation, accurate measurement, dry mixing, solution preparation, wet mixing fluidization, high-speed slurry, printing forming and moisture curing are carried out. The application adopts microstructure self-optimization active anti-freezing design, without coarse aggregate, which greatly reduces carbon emission, the anti-freezing grade of concrete reaches F125-F150, with excellent printability and mechanical properties, without printing head blockage problem, the preparation process is controllable, and is suitable for building 3D printing engineering in cold and seasonal freeze-thaw areas.

The utility model discloses a purity keeping device for a medical oxygen generator, which comprises a tower A and a tower B. The tower A and the tower B are respectively connected with an air outlet valve through an air outlet pipe, the tower A and the tower B are also connected through a return pipe, and a cut-off mechanism is arranged at the joint of the return pipe. By arranging the return pipe between the tower A and the tower B and arranging the cut-off mechanism at the joint of the return pipe, the problem that the oxygen production purity is reduced when the oxygen generator is started after shutdown and energy conservation can be effectively prevented, and the output purity of medical oxygen is ensured.