18results about How to "Dense tissue" patented technology

The application provides a wear-resistant composite piercing mill head manufacturing method and a piercing mill head, and the manufacturing method comprises the following steps: S1, preparing a steel base head; S2, adopting a submerged-arc welding process to make a flux-cored wire cladded on a working cone surface and a nose end surface of the steel base head, so as to form a cladding layer with a thickness of 6-8 mm; and S3, pre-oxidizing the cladding layer of the steel base head at high temperature, so that the wear-resistant composite piercing mill head is obtained. The wear-resistant composite piercing mill head manufacturing method has a dense and uniform oxide film on the surface of the cladding layer of the piercing mill head, the oxide film is firmly combined with the cladding layer, and the existence of the dense and uniform oxide film can reduce the power consumption of a steel pipe piercing mill and prolong the service life of the piercing mill head.

The application discloses a device and method for discharging additive and subtractive materials by planetary electrodes, and relates to the technical field of electric spark deposition, which comprises a shell, a bottom end of a stirring head in a semispherical shape, a feeding cavity arranged in the stirring head, a feeding port arranged at a bottom of a side wall of the stirring head, a feeding pipe arranged at a top end of the stirring head, a first driving mechanism for driving the stirring head to rotate, the stirring head penetrating through a planetary carrier, a gap being arranged between the planetary carrier and the stirring head, an axis of the stirring head being parallel to or coinciding with an axis of the planetary carrier, the planetary carrier being arranged in the shell and being rotationally matched with the shell through a bearing, a gas feeding cavity being arranged in the planetary carrier, an air filling pipe being arranged at a top end of the planetary carrier, a second driving mechanism for driving the planetary carrier to rotate, a plurality of rotary motors being fixedly connected with the planetary carrier, a gas feeding channel and a gas outlet being arranged in each rotary electrode, and an electrode ring being fixedly arranged on an inner wall of the shell. The application can improve the compactness of a coating.

This invention relates to the field of electronic paste preparation technology, and discloses a low sheet resistance tungsten-copper electronic paste and its preparation method, comprising the following steps: Step 1, preparing tungsten-copper composite powder: spherical tungsten powder with a diameter of 1-10 μm and copper powder with a size of 1-3 μm are mixed by mechanical mixing, with a tungsten to copper weight ratio of 3:1-6:1. Before mixing, the copper powder needs to undergo graphene coating pretreatment; Step 2, preparing an inorganic binder: the inorganic binder includes, but is not limited to, the following components: glass powder, CuO, TiO2, La2O3, Pu6O11; Step 3, preparing an organic carrier: the organic carrier includes a solvent, an organic binder, and a thickener; Step 4, preparing the tungsten-copper paste. The tungsten-copper paste of this invention has widely available raw materials, a simple preparation process, and is suitable for mass production. Although graphene, a high-priced material, is added, the amount added is small and the performance is particularly excellent, making the cost of the tungsten-copper paste of this invention far lower than that of similar foreign products, resulting in a very high cost-performance ratio.

This invention discloses a method for producing 8011 aluminum alloy flat ingots using a graphite crystallizer, comprising the steps of graphite crystallizer preparation, smelting, casting, sawing, and milling. The graphite crystallizer uses graphite plates prepared by hot isostatic pressing, with a carbon mass fraction ≥99.9%, density 1.6–1.85 g / cm³, average graphite particle size <25 μm, thermal conductivity 80–130 W / (m·K), porosity 13–15%, and a graphite plate thickness of 10–20 mm and a height of 95–105 mm. The large-face water cavity of the crystallizer has a length of 2450–2550 mm and a height of 155 mm, while the small-face water cavity has a width of 500–670 mm and a height of 155 mm. The cooling water pressure is controlled at 0.25–0.50 MPa. This invention improves the production quality of 8011 aluminum alloy flat ingots, reduces the defect rate, extends the service life of the crystallizer, and increases production efficiency and product qualification rate by precisely optimizing the material and structural parameters of the graphite crystallizer and designing smelting, casting, sawing and milling processes that are compatible with 8011 aluminum alloy.

The application discloses a method for electron beam fuse additive manufacturing of beta titanium alloy components, and belongs to the technical field of additive manufacturing. The application aims to solve the problems of long preparation period, low efficiency, low utilization rate, serious oxidation, significant beta spot and poor strength and toughness of the prior art. The method comprises the following steps: pretreating the printing wire and the substrate; establishing a three-dimensional entity model based on the target beta titanium alloy component, performing slice processing on the three-dimensional entity model to generate multi-layer two-dimensional slice data, and then importing the slice data into an electron beam fuse additive manufacturing equipment, and setting a scanning path, preheating parameters and printing process parameters; starting the equipment and performing vacuumization, printing the beta titanium alloy according to the set printing parameters and procedures, completing all layers, and obtaining the beta titanium alloy component. The beta titanium alloy component prepared by the application has high density, and provides a reliable technical approach for the preparation of high-performance beta titanium alloy components in the fields of aviation and aerospace.

The invention discloses injection-casting high-Zn magnesium alloy based on a two-stage corrosion-resistant barrier and a preparation method of the injection-casting high-Zn magnesium alloy, and belongs to the technical field of magnesium alloy materials and metallurgy. Aiming at the corrosion resistance bottleneck caused by looseness of a surface film of the high-Zn system injection casting magnesium alloy and strong cathode activity of a second phase of a grain boundary, a new two-stage corrosion resistance barrier design thought is provided, and through main and micro element optimization design, injection casting forming process optimization and cooperative regulation and control of a precise heat treatment system, the high-Zn system injection casting magnesium alloy is obtained. And a two-stage corrosion-resistant barrier with a compact surface passivation layer and a fine net-shaped weak cathode phase is constructed. After the magnesium alloy prepared through the method is soaked in a 3.5 wt% NaCl solution for 7 days, the weight loss corrosion rate is smaller than or equal to 0.70 mm / year, the hydrogen evolution rate is smaller than or equal to 0.40 mL / cm / day, the corrosion resistance is remarkably superior to that of an existing commercial high-Zn magnesium alloy, and the magnesium alloy is suitable for the fields, with requirements for corrosion resistance and light weight, such as 3C, unmanned aerial vehicles, robots and automobiles.

The invention discloses a friction deposition forming manufacturing method for an aluminum alloy aircraft hub, which comprises the following steps: establishing a three-dimensional model of the aircraft hub, depositing an aluminum alloy metal bar on a substrate according to a preset deposition path by adopting a friction deposition forming method according to the three-dimensional model of the aircraft hub to obtain an aircraft hub forging stock, the aircraft hub forging stock is subjected to finish forging and air cooling to the room temperature, a forging stock is obtained, the forging stock is subjected to heat treatment, and the aluminum alloy aircraft hub is obtained.The defects that in traditional forging production of the aircraft hub, the structure is uneven, and grains are coarse are effectively overcome, and the tensile strength, the ductility and other performance of the aluminum alloy aircraft hub are improved.

The application discloses a titanium carbide and element powder modification method for 5-series aluminum alloy and an aluminum alloy composite material, and aims to solve the technical problems that in the existing additive manufacturing, due to the high content of Mg element in the 5-series aluminum alloy, the additive manufacturing is difficult, and the aluminum alloy composite material obtained by additive manufacturing has crack defects and poor densification effect due to thermal cracks and evaporation of strengthening elements. The modification method comprises the following steps: obtaining 5-series aluminum alloy powder; adding titanium carbide particles and element powder to the 5-series aluminum alloy powder for mixing to obtain mixed powder; after heat preservation treatment of the mixed powder, the composite powder with small particle size is collected through screening; and the composite powder is formed by additive manufacturing, so that the modification of the 5-series aluminum alloy is completed, and the aluminum alloy composite material is obtained. The technical scheme of the application is used for providing a titanium carbide and element powder modification method for 5-series aluminum alloy and an aluminum alloy composite material.

The utility model discloses a multi-positioning step parting low-pressure casting mold which comprises a mold body, the mold body is of a left-right parting main body structure made of ZG310-570 cast steel, and the left-right parting main body structure comprises a left upper half mold, a left lower half mold, a right upper half mold and a right lower half mold. The left-right parting main body structure is transversely provided with a left-right symmetrical parting surface and is longitudinally provided with a curved surface step parting surface with a 35-degree dip angle. The repeated positioning precision of the mold is improved to + / -1mm through a three-stage positioning system, the position precision of a multidirectional boss is improved by 60%, the error rate is reduced by 30%, the product percent of pass reaches 96.5% by combining effective limiting of a curved surface step parting surface on a boss on the outer surface of a casting, and meanwhile, by means of the synergistic effect of a composite exhaust system and a longitudinal grading water gap system, the product quality is improved. And the air hole defect rate is controlled to be below 0.8%, the feeding problem at the hot spot is effectively solved, the casting quality and the production efficiency are remarkably improved, and the production requirements of high-end precision castings are met.

This invention discloses a near-net-shape aluminum-based composite material part manufacturing method and part. The manufacturing method includes: establishing a three-dimensional part model of the part to be manufactured, wherein the part model has a built-in double-helix siphon microchannel; slicing the part model to obtain slice data for each layer, wherein the slice data includes the geometry and printing path of the part in that layer; printing the part model using sand mold printing according to the slice data to obtain a preform, wherein after printing each layer, a binder is sprayed onto the powder layer used for printing; the preform is sequentially sintered, post-treated, and pre-treated to obtain a treated preform; the treated preform is placed in a pre-fabrication container, impregnated with molten aluminum, and then slowly cooled and solidified to obtain the part to be manufactured. This invention solves the problems of high processing difficulty and difficulty in controlling the precision of aluminum-based composite material parts in the prior art.

The utility model belongs to the technical field of roller casting equipment, and particularly relates to multi-channel type roller casting equipment which comprises three casting equipment bodies, a base is arranged at the bottoms of the casting equipment bodies, three auxiliary plates are evenly connected to the top end of the base, and the three auxiliary plates are arranged on the base. An annular groove is formed in the top end of the auxiliary plate, and through holes are formed in the top end of the base and the top end of the auxiliary plate. The multi-channel type roller casting equipment has the advantages that bubbles in pouring liquid are effectively promoted to rise to the surface and break, and therefore the defects of bubbles, gaps, air holes and the like in a casting after the pouring liquid is solidified are remarkably reduced; the compactness and the overall quality of the casting are improved, the pouring liquid is more uniform in the solidification process due to vibration, and the phenomena of stress concentration and non-uniform solidification caused by local premature solidification are avoided. The mechanical performance of the casting can be improved, and the surface quality and the size precision of the casting can be improved.

The invention belongs to the technical field of copper alloy materials, and relates to a preparation method of a high-strength corrosion-resistant rare earth copper-iron alloy. According to the method, 10%-20% by mass of iron, 0.2%-1.0% by mass of rare earth copper alloy and the balance copper are designed and smelted into a cast ingot in a vacuum high-frequency induction furnace protected by argon, a thick bar is obtained through homogenization treatment at the temperature of 900-1000 DEG C and hot forging at the temperature of 900-950 DEG C, and then a rare earth copper-iron alloy strip with the thickness of about 0.1 mm is prepared through multi-pass rolling; the rare earth elements are added in the form of rare earth copper intermediate alloy coated with copper powder, so that the burning loss can be reduced, and the component uniformity can be improved. Microstructure observation and performance test show that the rare earth addition can significantly refine the iron phase and improve the distribution of the iron phase, so that the tensile strength and conductivity of the alloy are improved, and the salt spray corrosion rate is significantly reduced under the appropriate rare earth content; the rare earth copper-iron alloy prepared by the method has high strength and high corrosion resistance, and is suitable for manufacturing structural parts and functional parts in a harsh corrosive environment.

The invention relates to a preparation method of low-esterification HG type passion fruit pectin, which comprises the following steps: S1, passion fruit peel is subjected to steam explosion, the steam explosion pressure is 0.2-0.5 MPa, the pressure maintaining time is 60-120 s, and passion fruit peel powder is obtained; s2, distilled water is added into the passion fruit peel powder obtained in the step S1, the pH is adjusted to be acidic, cellulase and hemicellulase are added for enzymolysis, and an enzymolysis extracting solution is obtained; s3, centrifuging the enzymolysis extracting solution obtained in the step S2, and collecting supernate; and S4, adding ethanol into the supernate obtained in the step S3, mixing, standing, centrifuging, collecting precipitate, and drying to obtain the low-esterification HG type passion fruit pectin. Compared with the prior art, through the synergistic effect of the steam explosion pretreatment and the compound enzyme composed of the cellulase and the hemicellulase, the main structure of the pectin is not damaged, the HG fragment can be completely reserved, and the extraction rate of the pectin is increased.

A method for preparing a yttrium silicide-modified M7C3-M2B reinforced H13 composite coating relates to the field of laser surface strengthening technology. The method involves mixing Cr powder, B4C powder, H13 alloy powder, and YSi2 powder, ball milling, and drying to obtain a mixed powder for laser cladding. Using a coaxial powder-feeding laser cladding method, and employing argon as both the powder-feeding gas and the protective gas, the mixed powder is conveyed to the surface of a preheated H13 steel substrate for in-situ laser cladding synthesis, resulting in a yttrium silicide-modified M7C3-M2B reinforced H13 composite coating. This invention provides a method for preparing a yttrium silicide-modified M7C3-M2B reinforced H13 composite coating.

The utility model relates to the technical field of casting, and particularly discloses a metal mold casting mold which comprises an upper mold unit, a bottom mold unit, a left mold unit, a right mold unit, a pouring structure, a loose piece, an iron core, a water inlet pipe and a water outlet pipe, the left mold unit is connected with the bottom mold unit in a sliding mode, and the right mold unit is connected with the bottom mold unit in a sliding mode and located at the upper end of the bottom mold unit. The left mold unit and the right mold unit are matched with each other, the two sets of pouring structures are embedded between the left mold unit and the right mold unit respectively, the upper mold unit is arranged at the upper ends of the left mold unit and the right mold unit, the movable block is embedded in the left mold unit, the iron core is embedded in the left mold unit, the water inlet pipe is communicated with the iron core, and the water outlet pipe is communicated with the iron core. The production efficiency is high, size machining is accurate, material consumption and energy consumption are small, and produced castings are good in inner surface quality and outer surface quality, free of impurities, air holes, shrinkage porosity and shrinkage cavity defects, compact in internal tissue and high in process yield.

The application discloses a Cr2N chromizing nitriding layer on a stainless steel surface, which is composed of a nitriding layer with Cr2N as a main phase; and the application also discloses a preparation method of the chromizing nitriding layer. ‑4 Pa, and then argon gas is introduced to prepare a chromizing layer; step two, preparation of the chromizing nitriding layer: after the preparation of the chromizing layer in step one is completed, the surface metallurgy equipment is vacuumized to 1.0*10 ‑2 Pa again, and then nitrogen gas and argon gas are introduced to prepare the chromizing nitriding layer. The preparation method of the application can effectively reduce the reaction temperature and shorten the reaction time, removes the powder loading and powder removing processes in the embedding chromizing-solid solution nitriding technology, greatly shortens the production cycle, avoids the dust pollution problem, and is suitable for industrial production.

The invention discloses a TA11 titanium alloy bar with high creep resistance and high fatigue performance and a preparation method of the TA11 titanium alloy bar, and belongs to the field of titanium alloy material processing. 2, the blank is subjected to multi-heating-number circulating forging; step 3, rolling a finished bar; and 4, surface treatment. By optimizing the proportion of the alpha stable element, the beta stable element and the trace strengthening element and carrying out multi-heating-number forging and finished product rolling to refine the alloy structure within the range above and below the phase transformation point temperature, the high fatigue performance of the TA11 alloy bar is achieved, meanwhile, the trace silicon element is introduced, the dispersion strengthening effect of silicide is utilized, and the high fatigue resistance of the TA11 alloy bar is achieved. Dislocation motion and grain growth are hindered, the high creep resistance of the TA11 alloy is achieved, and the creep resistance and the fatigue resistance of the TA11 alloy bar are synergistically improved.

The application discloses a kind of hot rolling methods of train brake beam full continuous rolling based on small square billet, comprising the following steps: (1) the billet after being heated to preset temperature is pushed out from heating furnace, and 6-9 passes of blooming rolling is carried out to small square billet by using cross-column type rolling mill;(2) the small square billet material after preliminary rolling by cross-column type rolling mill is further continuously rolled by 6-7 passes using flat-stand alternation type continuous rolling mill set.The hot rolling mode of cross-column type plus flat-stand alternation type full continuous rolling and the redesigned pass structure are used to produce train brake beam, and the rolling efficiency and yield of the product are greatly improved through continuous and rapid rolling by continuous rolling mill set, which greatly improves the rolling efficiency, and also greatly improves the stability and uniformity of the finished product, reduces the rolling cost and increases the economic benefit.