1579 results about "Quenching" patented technology

The invention relates to the technical field of roller type quenching machine cooling parameter optimization, and discloses a hybrid model-based roller type quenching machine billet cooling process parameter optimization method, which comprises the following steps of: performing parameter optimization on a flow set value and a roller way speed by adopting an improved particle swarm optimization algorithm to obtain a new flow set value of each section and an optimal roller way running speed; the new flow setting output by the improved PSO algorithm and the roller way speed serve as BP neural network input, and the water-cooling convective heat transfer coefficient is calculated; calculating boundary node temperature, solving an equation set through a TDMA numerical method, updating the position of a steel plate, calculating steel plate temperature distribution in the quenching process according to the position of the steel plate until the steel plate goes out of a quenching machine, constructing an optimized objective function of quenching cooling flow of the quenching machine, introducing a penalty function to perform constraint processing until iteration is terminated, and finally obtaining the quenching cooling flow of the quenching machine. And finally obtaining the set values of the regional flow and the roller speed corresponding to the minimum target function value of the steel plate, and outputting the corresponding temperature distribution of the steel plate.

The invention discloses a thermomechanical treatment method for an Al-Mg-Si alloy rolled plate, and relates to the technical field of aluminum alloys, and the thermomechanical treatment method comprises the following working procedures of fusion casting, head and tail cutting, surface milling, homogenizing heat treatment, temperature-controlled rolling, solid solution quenching and pre-aging treatment, and after a cast ingot obtained by fusion casting of an aluminum alloy raw material is subjected to head and tail cutting and surface milling, the Al-Mg-Si alloy rolled plate is obtained; and after homogenization heat treatment is conducted, temperature control rolling is directly conducted through waste heat, quenching and pre-aging treatment are conducted after temperature control rolling is completed, and the alloy rolled plate is obtained. According to the method, the purposes of saving energy, simplifying the process flow and improving the production efficiency are achieved, the microstructure of a cast ingot can be regulated and controlled, crystal grains are refined, wrong distribution is improved, the strength of a rolled plate is further improved, the problem that mechanical properties are unstable is solved, and the generation of a rib line is avoided.

The invention relates to the technical field of inorganic non-metal coating materials, in particular to high-stain-resistance enamel matte glaze and a preparation method thereof.The high-stain-resistance enamel matte glaze is prepared from selected quartz sand, feldspar and other basic raw materials by adding a composite additive Y and a rare earth activator Z. The preparation method comprises the steps that the basic raw materials are mixed and subjected to ball milling, then the additives are added for continuous ball milling, high-temperature melting, water quenching and secondary ball milling are conducted, and the high-stain-resistance enamel matte glaze is obtained. The granularity is controlled, and the stain resistance is improved. The enamel matte glaze has the advantages of obvious advantages, high stain resistance, difficulty in stain attachment, easiness in cleaning, capability of prolonging the service life of a product and reducing the maintenance cost, photocatalytic self-cleaning and environment-friendly characteristics, good matte effect and capability of improving the competitiveness of the product.

The invention discloses a method for rolling a TA21 titanium alloy sheet. The method comprises the following steps: 1, coating the surface of a TA21 titanium alloy plate blank with an anti-oxidation coating; 2, rolling for the first heating number; 3, cutting treatment; 4, rolling for the second heating number; and 5, cutting. 6, quenching treatment; 7, rolling for the third heating number; 8, cutting treatment; 9, annealing the semi-finished product; 10, cold rolling; and 11, annealing a finished product. According to the method, first two-heating-number rolling is carried out in a two-phase region, coarse beta grains are formed in combination with quenching and heat preservation, a long-strip-shaped alpha phase is separated out from a coarse beta phase through rapid water cooling to form a needle-shaped widmannstatten structure, then one-heating-number reversing large-deformation rolling and cold rolling are carried out in the two-phase region, a large number of structures are crushed and refined, the needle-shaped widmannstatten structure is spheroidized, and the needle-shaped widmannstatten structure is obtained. The TA21 titanium alloy thin plate with fine and uniform tissue is obtained, the plate blank is fully utilized, and the production efficiency is greatly improved.

The invention relates to a glass composition, inorganic glass powder and a preparation method thereof, and automobile pressed glass conductive silver paste and a preparation method thereof. The glass composition comprises a first glass composition and a second glass composition, wherein the first glass composition and the second glass composition respectively comprise Bi2O3, SiO2, B2O3, Sb2O3, Na2O, Al2O3, K2O, Li2O and CaO; the glass is prepared from the following raw materials: Bi2O3, B2O3, ZnO, SiO2, CaF2, Al2O3, MgO and Sb2O3. The preparation method of the inorganic glass powder comprises the following steps: mixing two glass compositions, heating, melting, quenching with water, and ball-milling into powder. The preparation method of the conductive silver paste for the automobile pressed glass comprises the following steps: mixing the organic carrier, the inorganic glass powder, the functional additive and the spherical silver powder, and grinding to obtain the conductive silver paste for the automobile pressed glass. Compared with the prior art, the silver paste has the advantages of being low in sintering process window, good in acid and alkali resistance, welding performance, wear resistance and ink matching performance and the like by adopting a silver powder system of a polycrystalline-gap structure, low-melting-point glass powder and various special functional auxiliaries, and the technical requirements of'pressing method 'process production can be met.

The invention discloses a production method of a high-performance sintered neodymium-iron-boron magnet. The production method comprises the steps of rapid quenching flaking, hydrogen decrepitation mixing, magnetic field forming, multi-stage treatment and composite coating. A nanocrystalline sheet is prepared through a rapid quenching technology, and uniform distribution of a grain boundary phase and rare earth elements is achieved through hydrogen decrepitation and material mixing; forming in a strong magnetic field and applying high pressure to improve the orientation degree; through high-temperature sintering, medium-temperature annealing and low-temperature aging treatment, magnet densification, grain boundary phase reconstruction and a magnetic domain structure are optimized; and finally, the corrosion resistance is improved by adopting a composite coating. The high-performance sintered neodymium-iron-boron magnet produced by the method comprises a main phase alloy, a grain boundary phase additive and a rare earth supplementary phase. Through low-oxygen nanocrystal preparation, grain boundary coordinated regulation and green process integration, compatibility of high performance, low cost and environmental protection is realized, and sustainable development of the rare earth permanent magnet material is promoted.

The invention belongs to the field of rare earth magnetic materials, and particularly relates to a rare earth high-entropy alloy, an annular magnet and a preparation method of the rare earth high-entropy alloy. The invention discloses a rare earth high-entropy alloy, the component of which is (HEA-Re) 2Fe14B, HEA-Re is more than four of rare earth elements La, Ce, Pr, Nd, Y, Gd, Ho, Dy and Tb, and the content proportions of the rare earth elements are the same; meanwhile, the invention discloses a preparation method for preparing the annular magnet by adopting the rare earth high-entropy alloy through the steps of smelting, solution rapid quenching, annealing heat treatment, magnetic powder preparation, magnet pre-forming, hot pressing, thermal deformation and the like, and the prepared annular magnet. According to the annular magnet prepared through the components and the method, the magnetic performance and the mechanical performance are obviously improved, the content of high-price rare earth elements is reduced, and the cost is effectively saved.

The invention relates to the technical field of automatic control, in particular to a monitoring method and system for synthesizing ceramide based on alpha-hydroxy fatty acid, and the monitoring system for synthesizing ceramide based on alpha-hydroxy fatty acid comprises a raw material feeding module, a reaction control module, a quenching-crystallization joint control module and a data integration module; carrying out dynamic weighing monitoring on the raw materials based on the received synthesis instruction, and starting a reaction kettle according to weighing data; performing multi-dimensional data acquisition in real time according to the set reaction data, and performing dynamic feeding control according to the set reaction data; when the TLC detection substrate reaction is completed, the cooling process and the crystallization process are regulated and controlled in real time according to the reaction data until the end point judgment standard is met; according to a received synthesis completion instruction, product quality data is obtained, a monitoring data packet is generated, the synthesis instruction is marked and then stored, process control is accurately monitored and controlled, and the purity and crystal form of the product are ensured.

The invention discloses a purification method for removing quartz inclusion, which comprises the following steps: calcining a quartz sand raw material at high temperature for a certain time, then taking out and quickly putting into cold water for cold quenching; dehydrating quartz sand, feeding into a microwave reactor, heating to a set temperature, and keeping for a period of time; after the reaction is finished, cleaning the quartz sand with ultrapure water; filling the quartz sand into a high-temperature and high-pressure reactor, introducing supercritical carbon dioxide and hydrogen fluoride mixed gas, and keeping the temperature and the pressure for a period of time; and after the reaction is finished, discharging gas to obtain the high-purity quartz. Through two-stage heat treatment, a channel between gas-liquid inclusions in quartz particles and the outside can be efficiently opened, and meanwhile, the supercritical method ensures that impurities in the inclusions can be effectively dissolved out; the treatment time is short, the required temperature is low, the acid consumption is less than 10%, and the method has the advantages of high efficiency and low cost.

To provide a quenching simulation method for steel with high accuracy.SOLUTION: Provided is a quenching simulation method for steel, comprising: a calculation section 1 calculating a distribution of temperatures by a heat conduction analysis using a finite element method after inputting each of steel phases and physical properties at each of steel temperatures to separate a shape model; a calculation section 2 calculating distribution of strain or stress by an elastoplastic analysis; a calculation section 3 calculating distribution of phase fraction through calculation of a basic equation representing phase transformation; and a calculation section 4 calculating distribution of cooling speed from time change of temperature of each of elements, the method comprising a step of carrying out coupled analysis using phase transformation parameters of the steel calculated from the cooling speed calculated with the calculation section 4 on a procedure to calculate the phase fraction in the calculation section 3.SELECTED DRAWING: Figure 1

The invention discloses a layered ternary selenide, a layered ternary selenide single crystal material and a preparation method of the layered ternary selenide single crystal material, and belongs to the technical field of crystal materials. The chemical formula of the layered ternary selenide is In2Ge2Se6, indium powder, germanium powder and selenium powder in a specific ratio are adopted as raw materials, synthesis of the layered ternary selenide In2Ge2Se6 single-phase material is achieved through the processes of high-temperature melting, heat preservation in a specific temperature interval and quenching, and the material has a narrow band gap and low heat conductivity and can be used for preparing the high-temperature-resistant layered ternary selenide In2Ge2Se6 single-phase material. And the thin-layer nanosheet single crystal material with the millimeter-level area can be prepared by a mechanical stripping method, and can be applied to the fields of semiconductor photoelectric devices, solar cells, thermoelectric devices and the like.

The invention discloses a production process of tempered laminated glass, which belongs to the technical field of tempered glass, and comprises the following steps: strictly screening raw sheets, carrying out three-zone gradient tempering, namely, mutually combining 680-700 DEG C temperature zone temperature control and 8-12kPa gradient wind pressure quenching, and precisely compounding by using a PVB interlayer to obtain the tempered laminated glass. 23 DEG C / 30% RH pre-balancing, 0.5 mm vacuum positioning and 120-140 DEG C rolling initial pressing are combined, and then high-pressure kettle staged curing, namely, the process of heat preservation for 120 minutes at 1.2 MPa / 135 DEG C and the process of gradient cooling at the temperature smaller than or equal to 15 DEG C / h are combined, so that the finally prepared tempered glass product has high optical performance, namely distortion smaller than or equal to 0.1 mm / mm, high impact resistance, namely no penetration in 1m steel ball falling and excellent weather resistance; degumming is avoided in the environment of 85 DEG C / 85% RH / 500 h, and accurate control over the whole process from materials to finished products is achieved. Therefore, the production process of the tempered laminated glass solves the technical problem of how to improve the production efficiency of the tempered laminated glass.

The invention discloses a polyurethane foaming material with a gradient density skin-core structure and a preparation method thereof, and the preparation method comprises the following steps: step 1, injecting a mixed polyurethane foaming raw material into a preheated foaming mold, and closing the mold; step 2, synchronously starting a mold rapid cooling system and an air pressure balance system for foaming and curing when the reaction raw materials are injected; and step 3, taking out the product after curing, standing at room temperature, and curing to obtain the polyurethane foam material. The surface temperature of the mold is suddenly reduced through quenching temperature control so as to form a compact skin layer, and an in-mold pressure curve is controlled by using an air pressure balance program so as to accurately regulate and control foaming of a core layer. The prepared material has a continuous gradient density structure, the skin layer density is high, the core layer density is low, a transition interface with strong binding force is arranged between the skin layer and the core layer, and the extreme performance combination of'hard outside and soft inside 'is successfully realized.

The invention relates to a steel pipe for a drill pipe body, comprising the following components in mass percentage: C: 0.26% to 0.28%; Si: 0.25% to 0.28%; Mn: 0.85% to 0.90%; Ni: ≤0.04%; Cr: 1.00% to 1.05%; Mo: 0.24% to 0.27%; Cu: ≤0.02%; Al: 0.020% to 0.030%; V: 0.07% to 0.0 9%; P: ≤0.013%; S: ≤0.003%; H: ≤0.0002%; the rest are iron and unavoidable impurities; the present invention realizes high-precision dimensional tolerance through component design and seamless steel pipe preparation, and then undergoes a heat treatment system of water quenching + air quenching + oil quenching + tempering of the blank sample. The three-medium quenching can make the material enter the martensite phase region faster and last for a longer time, providing a wider quenching and tempering temperature control range and performance margin for the heat treatment of the whole pipe.

The invention discloses a quenching treatment device for belleville springs and belongs to the technical field of belleville spring machining, an erecting assembly is driven by a supporting rod to rotate, the erecting assembly can drive a plurality of belleville springs to rotate, a plurality of rotating gears are in meshed connection with a gear ring, and the rotating gears can rotate and revolve around a center gear at the same time; the quenching heat treatment mechanism can conduct heat treatment on the belleville springs arranged outside the erecting assembly in a sleeving mode, the belleville springs are in a movable state, so that the belleville springs can be evenly heated, the heating effect cannot be affected by stacking or placing positions of the belleville springs, the product quality is guaranteed, and along with continuous rotation of the center gear, the service life of the belleville springs is prolonged. The belleville springs subjected to heat treatment can be moved out of the working area of the quenching heat treatment mechanism, the belleville springs to be subjected to heat treatment can be conveyed into the working area of the quenching heat treatment mechanism by the erecting assembly, the purpose of continuously carrying out heat treatment on the batched belleville springs is achieved, and then the machining efficiency of the belleville springs is improved.

The multi-field coupling collaborative modeling and parameter autonomous intelligent decision-making method for the roller type quenching process comprises the steps that four key process parameters including the nozzle flow, the water ratio, the roller gap distance and the plate passing speed are collected and subjected to normalization preprocessing, and a training set and a test set are divided; the four key process parameters of the training set serve as input, the water-cooling convective heat transfer coefficient and the phase change plasticity coefficient serve as output, a BP neural network is trained, and the workpiece surface water-cooling convective heat transfer coefficient and the material internal phase change plasticity coefficient are predicted through the trained BP neural network; a multi-field coupling model composed of a temperature field, a structure phase change field and a stress-strain field is solved, and quantitative calculation of quenching core quality indexes is achieved; by taking water consumption minimization as a target, constructing a nonlinear optimization model under the condition that multiple core quality index constraints of the plate temperature, the outlet hardness and the plate shape are met; and performing global optimization on the optimization model by adopting a differential evolution algorithm, and autonomously deciding an optimal process parameter set value.

The invention provides a preparation method of magnesium niobate, which comprises the following steps: carrying out wet ball milling on MgO and Nb2O5, uniformly mixing, and drying to obtain mixed powder; the mixed powder is heated to 1500-1700 DEG C for 1-3 h and then subjected to water quenching, and solid particles of a core-shell structure inclusion are obtained; and heating the solid particles to 1000-1200 DEG C, and carrying out heat preservation to obtain the magnesium niobate. Solid particles of a core-shell structure inclusion are formed through a water quenching process, then MN obtained through rapid heating sintering is high in purity and stability, Mg < 2 + > and Nb < 5 + > in the MN are high in uniformity and large in reaction activity, sufficient mixing with PbO and TiO2 at a high temperature is facilitated to form a liquid phase, the formed raw material for PMNT crystal growth is better in singleness and uniformity, and the preparation method is simple and easy to implement. Furthermore, the PMNT single crystal with a single perovskite structure, high purity and excellent piezoelectric property can be obtained, and the yield is improved.

The invention discloses fluoride-salt-free and nitrate-free medium-temperature semitransparent glaze for steel plate enamel as well as a preparation method and application of the medium-temperature semitransparent glaze, and belongs to the technical field of enamel. The semitransparent glaze is prepared from quartz, potassium feldspar, anhydrous borax, sodium carbonate, titanium dioxide, monopotassium phosphate and zinc oxide according to a specific mass ratio. The preparation method comprises the steps of raw material mixing, high-temperature melting under a pure oxygen condition, wiredrawing detection, quenching and the like. The semitransparent glaze is completely free of fluoride salt and nitrate, the problems of fluoride emission and environmental protection equipment blockage are avoided from the source, the fluorine content of the product is not detected through detection, the product meets the requirements of European Union REACH regulations, meanwhile, the product has good porcelain surface, luster and firing adaptability, is suitable for a steel plate matrix, has the firing temperature of 800-840 DEG C and the firing time of 20-30 minutes, and is suitable for a steel plate. The method can be used for producing green and environment-friendly enamel products.

The hot gas bulging forming system comprises a pipe bending device, a feeding device, a pre-forming device, a heating device, a bulging quenching device and a discharging device which are sequentially arranged, the heating device comprises a heating cavity, and an electrode chuck used for clamping the end of a metal pipe is arranged in the heating cavity; the electrode chuck is connected with an IGBT induction heating device, an infrared thermometer is arranged in the heating cavity, and the infrared thermometer and the IGBT induction heating device are both in communication connection with a controller. According to the hot air bulging forming system, materials with different thicknesses and pipes with complex shapes can be conveniently heated, the heating rate of the materials with different coatings can be adjusted through the controller according to coating characteristics, accordingly, the coatings are protected to the maximum extent, the better product surface quality is obtained, the application range is wide, the heating speed is high, and the production efficiency is high. And the heating efficiency is greatly improved. The invention further discloses a hot gas bulging forming method.

The invention relates to the technical field of tempered glass production, in particular to a tempered glass air grid quenching blowing control method which comprises the following steps: step 1, parameter acquisition: acquiring key parameters of tempered glass to be quenched and current state parameters of an air grid in real time through a sensor group; wherein the thickness sensor adopts a laser displacement sensor, is arranged in front of an air grid inlet, collects thickness data of different positions of glass, takes an average value as a thickness parameter d, and ensures that the data can reflect the overall thickness condition of the glass; according to the tempered glass air grid quenching air blowing control method, the air blowing pressure, the air speed, the air blowing angle and the air grid distance of the air grid can be dynamically adjusted by collecting parameters such as the thickness, the temperature distribution and the transmission speed of glass in real time and combining an intelligent control algorithm; accurate control over the quenching process of the tempered glass is achieved, and the stress distribution uniformity and flatness of the glass are improved.

The invention discloses a method for regulating and controlling the strength and plasticity of a FeMnCrCo-series high-entropy alloy based on pre-introduction of multi-dimensional crystallography defects, and relates to the technical field of high-entropy alloy materials. Cleaning in the vacuum induction furnace; performing vacuum melting; casting is conducted; carrying out homogenization treatment; forging treatment; carrying out six-pass hot rolling treatment; first-pass cold rolling treatment; first low-temperature annealing treatment; performing second-pass cold rolling treatment; carrying out secondary low-temperature annealing treatment; third-pass cold rolling treatment; and annealing treatment. Inter-pass annealing treatment is introduced into a cold rolling link of a traditional plate preparation process, and water-cooling quenching is assisted. According to the method, the multi-dimensional crystallographic defects generated in the cold rolling process are reserved in an initial microstructure of the alloy before a mechanical property test, the crystallographic defect type, density and spatial distribution in the initial microstructure of the alloy are regulated and controlled, a multi-dimensional defect strengthening mechanism is constructed, and good strength and plasticity matching of the alloy is achieved.

The invention particularly discloses a deep removal method for lattice impurities and inclusion in high-purity quartz sand. The method comprises the steps of calcination water quenching, ultrasonic acidification, first-stage roasting, second-stage roasting, secondary water quenching, hot-pressing acid leaching and cleaning and drying. According to the method, through calcination water quenching, ultrasonic acidification, two-stage roasting, secondary water quenching and hot-pressing acid leaching, lattice impurities and tiny inclusion bodies in the high-purity quartz sand can be deeply removed, the purity of the purified quartz sand reaches 4N8 and even 5N grade or above, and then the technical problems existing in the prior art are solved.

The utility model discloses a water residue and water quenching prevention system for polycrystalline silicon broken material packaging, and particularly relates to the technical field of polycrystalline silicon processing, the system comprises an integrated control unit, a water quenching module, a water residue and water treatment module, a packaging module, a crushing module, a screening module, a drying module, a quality detection module and an environmental adaptability module. According to the water quenching system for preventing moisture residue in the polycrystalline silicon broken material packaging, the utilization rate of materials is improved through efficient crushing and accurate screening, the waterproof performance of products is enhanced through vacuum degassing and automatic humidity control, the consistency of product quality is ensured through automatic quality detection, and the production efficiency is improved. And the safety of the system is improved through integrated control and an emergency discharge device. The characteristics jointly improve the production efficiency, and ensure the stability and reliability of the product in a changeable environment.

The invention discloses a multi-component atomic level oxide solid solution integrated electrode for electrolyzed water and a preparation method thereof, and belongs to the field of metal material surface plating. The electrode is composed of a gas diffusion layer, a nano array substrate and an atomic level oxide solid solution catalyst layer. The preparation method comprises the following steps: constructing a nano array microreactor on the surface of the gas diffusion layer; the method comprises the following steps: driving an atomic hierarchy solid solution to reconstruct by utilizing an array confinement effect through combination of precursor directional spraying and a heat treatment-rapid quenching process, and constructing a three-dimensional conformal ionomer network on the surface of the atomic hierarchy solid solution; and performing gold plating treatment on the back side of the electrode. Through the synergistic effect of spatial constraint and thermodynamic regulation of the nano microreactor, the traditional electrode interface mismatch bottleneck is broken through, and while precise construction of atomic-scale active sites is realized, the mechanical stability and oxygen evolution reaction kinetics of the electrode are improved. The preparation process has the advantages of controllable flow, strong large-scale expansibility and good industrial preparation prospect.

The utility model discloses a quenching heat treatment device for metal material processing, and relates to the technical field of metal material processing equipment. The quenching heat treatment device for metal material processing comprises a box body, a partition plate is fixedly installed on the inner wall of the box body and divides the interior of the box body into a heating bin and a cooling bin vertically, a guide frame is fixedly installed in the center of the partition plate, a placement frame is slidably installed on the inner wall of the guide frame, and cooling water is placed at the bottom of the inner side of the box body; the heating wire is fixedly mounted between the partition plate and the top of the inner side of the box body. According to the quenching heat treatment device for metal material machining, the interior of the box body is divided into the heating bin and the cooling bin through the partition plate, metal is heated and cooled in a sealed environment through the heating wire and cooling water on the inner side of the box body, in the heat treatment process of the metal, the safety of workers is guaranteed, and the heat treatment efficiency is improved through the air pump; and water vapor generated during quenching can be extracted, so that the water vapor is prevented from diffusing into a plant, and the internal environment of the plant is guaranteed.

The present invention discloses a heat treatment method for a high-toughness high-carbon chromium bearing, and belongs to the technical field of bearing heat treatment. The present invention sequentially performs solid solution pretreatment, spheroidizing annealing, austenitizing and isothermal quenching treatment on the high-carbon chromium bearing; the steps of the isothermal quenching treatment are: the austenitized high-carbon chromium bearing is rapidly cooled to a temperature of Ms-(10-40)°C and kept warm for 10-20 minutes, then placed at a temperature of Ms+(30-50)°C and kept warm for 50-70 minutes, and then cooled to Ms+(5-10)°C and kept warm for 180-220 minutes. The metallographic structure obtained by the above-mentioned heat treatment method has good uniformity, and the high-carbon chromium bearing after heat treatment has greatly improved toughness while maintaining high hardness, and has high strength and good wear resistance; at the same time, the heat treatment process is relatively simple, with low energy consumption and low cost.

The invention relates to a red copper thick plate and a preparation method thereof. The preparation method comprises the steps of smelting, casting, hot rolling, online quenching, cold rolling, finished product annealing, sampling detection, finished product sawing and packaging and warehousing. In the smelting process, Cu-La intermediate alloy is added, and the adding amount is 5-200 ppm; in the hot rolling process, the finish rolling temperature is controlled to be larger than or equal to 600 DEG C, rapid cooling is conducted after hot rolling, and online quenching solid solution is achieved; and when a finished product is annealed, the annealing temperature is controlled to be 200-450 DEG C, the time is 5-8 hours, and a protective atmosphere is adopted. According to the method, the problem of coarse grains of the soft red copper thick plate is solved, the fine and uniform soft red copper thick plate is obtained through a process test, and a good effect is achieved in application practice; the problem that the production difficulty of the products is large is solved, batch production can be achieved, and the industrial production target is achieved.

The invention provides a U-shaped von Karman variable curvature curve profile frame roll bending forming process. The U-shaped von Karman variable curvature curve profile frame roll bending forming process comprises the following steps that S1, hard material roll bending forming is adopted for raw materials of a U-shaped frame; s2, the blanking size of the U-shaped frame is limited; s3, performing segmentation processing on the U-shaped frame curve by adopting a radius fitting method; s4, roll bending is conducted on the U-shaped frame, and the arc length compensation of each section is prolonged; and S5, different reduction values are added to the radius of each section of each pass of roll bending of the U-shaped frame, and the von Karman curve U-shaped frame is obtained. The von Karman curve variable curvature U-shaped frame has the beneficial effects that a hard material roll bending forming process is adopted to replace a stretch bending forming process, the part forming precision can be improved, the production efficiency is improved, the quenching procedure in the stretch bending forming process is omitted, and the production cost is reduced.

The invention discloses a method for separating and recycling a silver-copper composite material through selective interface oxidation. The method comprises the following steps that the material is crushed and sheared, and a crushed material is obtained; the crushed material is pretreated and then fed into an oxidation fluidized bed, an internal oxidation reaction is conducted in a gas phase at the temperature of 400-700 DEG C and the oxygen pressure of 0.2-0.6 MPa, the reaction time is 20-60 h, and a high-temperature material is obtained; quenching the high-temperature material to generate stress cracks on an oxidation interface to obtain a cooled material; and stripping the cooled material under the mechanical action to obtain a recycled copper material and a recycled silver material, oxidizing the electrical contact material or leftover materials of the electrical contact material in the oxygen atmosphere to oxidize an interface between the silver-copper composite materials to form an oxidation film, separating the two materials of the silver-copper composite materials under the quenching and mechanical actions, and then, obtaining the recycled copper material and the recycled silver material. The method is high in recovery rate, high in recovery purity and environment-friendly.

The invention relates to a preparation method of high-purity quartz sand, which is applied to the field of quartz sand preparation and comprises the following steps: during preparation of the high-purity quartz sand, performing targeted magnetic separation treatment on a quartz sand material which enters a magnetic separator and is subjected to water quenching and drying, performing normal magnetic attraction on quartz sand blocks, and performing normal magnetic attraction on powdery materials. The magnetic material conveying belt is moved into the powdery materials to be rubbed, so that the magnetic attraction sufficient degree of the magnetic materials in the powdery materials is enhanced, in addition, the problem that the thickness of the material conveying belt is not uniform is solved through a limiting piece structure, and through cooperative use of a limiting plate, a movable pocket plate and an intercepting plate, the magnetic attraction sufficient degree of the magnetic materials in the powdery materials is improved. The powdery materials are uniformly laid on the surface of the material conveying belt, so that the magnetic separation efficiency and the preparation efficiency and quality of the high-purity quartz sand are further improved.