23 results about "Refined grains" patented technology

The invention discloses a refined grain crop yield prediction method and system, belongs to the technical field of agricultural yield prediction, and solves the problems that the prediction precision is low and day-by-day prediction and overfitting cannot be realized when the crop yield of a small plot scale is predicted. The method comprises the following steps: obtaining food crop data, wherein the food crop data comprises meteorological data and crop emergence period data; dividing the prediction area into a plurality of parameter adjustment areas, and establishing a simulation algorithm based on a WOFOST crop mechanism model for each parameter adjustment area; performing day-by-day simulation by using a WOFOST-based crop mechanism model simulation algorithm to obtain a crop development process, a leaf weight, a stem weight, an ear weight, an overground part dry matter weight and a leaf area index; and taking the output data based on the WOFOST crop mechanism model simulation algorithm, the meteorological elements, the statistical yield data, the field test data and the agrometeorological observation data as the input of an LSTM algorithm, and obtaining a prediction result of the yield of the food crops. The method is suitable for real-time and refined prediction of the crop yield.

The invention provides a preparation method of a hollow directional solidification blade, and relates to the technical field of precision casting. Specifically, a pouring cup, a first composite wax mold and a second composite wax mold are configured; wherein the first composite wax mould comprises a blade wax mould, a seeding straight section wax mould and a seeding draft section wax mould which are integrally pressed, and the second composite wax mould comprises a seeding stepped draft section wax mould and a base plate which are integrally pressed; and then the procedures of wax mold welding, mold shell preparation, pouring and crystal pulling, shell cleaning and cutting, depoling, checking and heat treatment are conducted in sequence, and the hollow directional solidification blade is obtained. The invention designs and provides a draft stepped seeding section module, which is combined with a pouring process with an underneath blade tip of the blade and can be assisted by a special-shaped heat screen to improve the local temperature gradient, so that the high-quality blade with refined grains, few cracks and few mixed crystals or monotectic is prepared, and the draft stepped seeding section module is particularly suitable for preparation of large-size complex hollow blades. The method has a good application prospect in the aspect of heavy-duty gas turbines.

The present invention provides fine grain structures for rare earth permanent magnets (REPMs) and their production in a manner to significantly enhance flexural strength and fracture toughness of the magnets with no or little sacrifice in the hard magnetic properties. The tough REPMs can have either homogeneous or heterogeneous refined grain microstructural architectures achieved by introducing a small amount of additive particle materials into the magnet matrix, such as fine-sized, insoluble, chemically stable, and non-reactive with the magnet matrix. These additive materials can act effectively as both heterogeneous nuclei sites and grain growth inhibitors during the heat treatment processes, which in turn resulting in refined grain structures of the REPMs. Alternatively, the fine grain structures were also achieved by using magnet alloy feedstock powders with finer particle sizes. The fine grains acting as the strengthening sites can inhibit the crack nucleation and can also slow down the propagation of micro-cracks, which in turn increasing magnet's fracture toughness.

The invention discloses a method for optimizing parameters for a steel pipe expanding process by using a thermal simulation experiment technology. The method comprises the following steps: S1, sample preparation: cutting out a plurality of cylindrical thermal simulation samples from a target steel pipe; s2, designing a scheme, namely setting a plurality of groups of process parameter combinations including a heating temperature T, a heat preservation time t, a deformation rate epsilon 1 and a deformation epsilon 2; s3, performing thermal compression experiments: performing multiple groups of thermal compression experiments on the sample on a thermal simulation experiment machine according to the parameter combination; s4, structure analysis: analyzing the metallographic structure of the test sample after the experiment, and determining process parameters corresponding to the test sample which is completely recrystallized and has refined grains; and S5, window determination: based on an analysis result of S4, determining an optimal process parameter window for enabling the steel pipe to be subjected to complete recrystallization and grain refinement. The invention further discloses a diameter expanding method. The purpose of the invention is to realize accurate control of the expanding process by combining a thermal simulation experiment with industrial production.

The application provides a processing method of a cemented carbide material, comprising the following steps: cooling a cemented carbide sample from 20 DEG C to -190 DEG C within 210-420 min; after the cooling, keeping the sample at -190 DEG C in a liquid nitrogen atmosphere for 2 h; after the keeping, heating and tempering the sample to 30 DEG C and keeping the sample at 30 DEG C for 1 h. The processing method provided by the application increases the number of refined grains of the processed cemented carbide material and increases the content of grains with a particle size less than 0.5 μm.

The present application relates to the technical field of high-strength deep-drawing cold-rolled steel sheet preparation, and particularly relates to a cold-rolled 780-grade DH steel with refined grains and uniform structure and a production method thereof.The chemical composition of the steel is as follows in terms of percentage by weight: C: 0.08%-0.12%, Si: 0.4%-0.6%, Mn: 1.6%-2.0%, Nb: 0.02%-0.04%, P: ≤0.012%, S: ≤0.005%, Ti: 0.01%-0.02%, Als: 0.025%-0.050%, N: ≤0.0035%, and the balance being Fe and inevitable impurities.The ferrite grain size of the steel is 5-8 mu m, and the grain size standard deviation is ≤1.2 mu m, thereby solving the problem of uneven structure.The finished steel has a tensile strength of ≥780 MPa, an elongation after fracture of ≥22%, and a earing rate of ≤1.5%, thereby meeting the requirement of complex deep-drawing.

To provide a husking and sorting machine that is able to shorten the time taken for a residual grain discharge step to be executed after the completion of a husking and sorting step.SOLUTION: A husking and sorting machine (10) includes: a husking unit that performs husking; a shaking and sorting unit (22) that sorts mixed grains into husk and refined grains; a mixed grain elevator (18) that sends the mixed grains to the shaking and sorting unit (22); a refined grain elevator (26) that emits the sorted refined grains; and a control unit (40) that controls each device (18, 22, 26). The mixed grain elevator (18) and the refined grain elevator (26) have air nozzles (44, 64) capable of jetting compressed gas toward each bottom portion. The shaking and sorting unit (22) includes a shaking and sorting plate (50) disposed at a predetermined inclination angle and an angle adjustment unit (52) that adjusts the inclination angle. The control unit (40) determines an injection condition for the compressed gas and the inclination angle, controls the air nozzles (44, 64) according to the determined jetting condition during execution of a residual grain discharge step, and adjusts the inclination angle.SELECTED DRAWING: Figure 4

The invention discloses a manufacturing method of a mushroom head forge piece of a miter gate bottom pivot of a ship lock of a large hydropower station, and relates to the technical field of heat treatment methods, and the manufacturing method comprises the following steps: S1, smelting: smelting the mushroom head forge piece by adopting an electric furnace, external refining and vacuum degassing smelting; s2, forging is conducted, specifically, the initial forging temperature is 1200 DEG C, and the final forging temperature is 850 DEG C; forging deformation: drawing out, chopping a riser and a water port, upsetting, drawing out, upsetting, drawing out, upsetting and forging a mushroom head by a die, and shaping; s3, heat treatment after forging is conducted, refined grains are annealed at 680 DEG C, and tempering is conducted at 600-620 DEG C; s4, rough machining; s5, performance heat treatment is conducted, specifically, quenching is conducted at 1020 DEG C, and tempering is conducted at 520-540 DEG C; and S6, machining is carried out, after sampling detection is completed after heat treatment, one-time rough turning is carried out on the spherical end and the large-plane end, hoisting bolt holes are machined, and finish turning is carried out. The manufactured mushroom head forge piece meets the requirements of high working strength, corrosion resistance and wear resistance of the bottom of the ship lock.

The invention discloses an ingot high-Al-content high-strength low-temperature A633D steel plate and a production method thereof. The A633D steel plate comprises the following chemical components in percentage by mass: 0.14 to 0.17 percent of C, 0.20 to 0.45 percent of Si, 1.45 to 1.60 percent of Mn, less than or equal to 0.012 percent of P, less than or equal to 0.003 percent of S, 0.25 to 0.50 percent of Alt and the balance of Fe and trace unavoidable impurities. The production method comprises the working procedures of smelting, die casting, heating, rolling, stacking and slow cooling and normalizing heat treatment. In the normalizing heat treatment process, heating must be sufficient, the normalizing temperature is 900-910 DEG C, and the heat preservation time is 1.8-2.1 min / mm; and after normalizing and discharging, water cooling is carried out for accelerating cooling, and the cooling speed is 0.8-2 DEG C / s. Tapping conditions are strictly controlled, a fine smelting process is adopted, ultrahigh-aluminum-content refined grains are adopted, and the internal quality of the steel plate is improved.

The invention provides a grain fine processing device, and belongs to the technical field of grain fine processing, the grain fine processing device comprises a processing shell; the reaction shell is fixedly connected to one end of the processing shell; the translation groove is formed in one end of the processing shell; when grains need to be processed, the grains are placed in the processing shell, at the moment, the processing mechanism conducts roller grinding type shelling treatment on the grains for the first time, the grains are divided into refined grains and rice bran, the rice bran is left at the upper end of the processing mechanism through the filter plate, and due to the fact that the grains of the refined grains are small, due to the design, the grains of the refined grains are separated from the rice bran through the filter plate. By means of the device, the high utilization rate of grains can be achieved with few structures, cost and energy consumption are reduced, and on the contrary, the processing completeness of the grains can be improved.

The present invention belongs to the technical field of gear heat treatment, and discloses a rotary kiln large gear heat treatment process optimization system and method; the method comprises: performing normalizing forging twice on a preselected material to obtain a preselected material with refined grains, processing the preselected material with refined grains to obtain a gear, performing vacuum nitriding treatment on the naturally cooled gear to obtain a first gear; performing gradient quenching treatment on the first gear to obtain a second gear; performing carburizing treatment and isothermal tempering treatment on the second gear to obtain a third gear; presetting a scanning range, scanning step length and scanning speed, and collecting X-ray diffraction patterns, neutron diffraction data and eddy current signals on the surface of the third gear; the present invention can effectively eliminate stress, dynamically adjust process parameters such as tempering, so that the heat treatment process is in a precisely controllable state throughout the entire process, and comprehensively improve gear performance.

The invention discloses a high-purity oxygen-free copper rotating target material pipe and a preparation method thereof, the preparation method comprises the steps of heating extrusion, acid liquor cleaning, stretching, straightening and the like, and finally the high-purity oxygen-free copper rotating target material pipe with the pipe diameter being 178 + / -1 mm, the wall thickness being 27.5 + / -1 mm, the hardness being 80-100 HV, the length being larger than or equal to 3010 mm and the average grain size being smaller than 60 microns is obtained. According to the method, a low-temperature rapid heating method is adopted firstly, growth of oxygen-free copper ingot crystal grains is inhibited, the crystal grains are fine and uniform, and the structure uniformity is better; then, the tensile deformation is controlled through extrusion, diameter-reducing stretching and wall-reducing stretching, so that the dimensional tolerance and tensile deformation are reduced, meanwhile, the internal structure and performance of metal are improved, defects are reduced, and the hardness of the pipe is synchronously improved in combination with refined grains; and meanwhile, the straightness of the pipe is ensured by controlling the stretching machining rate through a stretching method, so that the problem that the average grain size, dimensional tolerance, hardness and straightness of the target pipe are difficult to control is solved.

The invention discloses a method for predicting the performance of a formed part of an additive manufacturing and rolling composite process, and belongs to the field of material performance characterization and prediction.The method comprises the steps that thermal response of a metal part to moving laser is simulated through modeling by means of a finite element method, and real-time temperature field data are obtained; establishing a temperature-dependent phase field model, and importing the additive parameters and the temperature field data output by the finite element method into the temperature-dependent phase field model to output microstructure data; establishing a rolling grain growth recrystallization model coupled with crystal plasticity and a phase field method by using the microstructure data; the grain size after recrystallization refining is output according to a grain growth recrystallization model of a phase field method; and predicting the performance of the formed part according to the grain size after recrystallization and refinement. According to the method, efficient prediction of the performance of the formed part is realized through accurate simulation of the grain size.

The invention discloses a production process of a high-strength and high-conductivity aluminum rod. The production process comprises alloy component design, casting process optimization and rolling cooling control. According to the method, Zr is added into matrix aluminum, the Zr element achieves fine grain strengthening by forming a nanoscale Al3Zr precipitated phase, meanwhile, grain boundary scattering is reduced to maintain high conductivity, gradient water cooling is adopted in the continuous casting cooling stage, rapid solidification of refined grains can be achieved, atomization water cooling is adopted in the second stage of the hot rolling stage, and therefore Al3Zr coarsening is restrained, and the conductivity of the aluminum alloy is improved. Through low-cost process adjustment, the comprehensive performance of the aluminum rod is remarkably superior to that of a conventional product, the tensile strength of the aluminum rod is improved by 30% or above, the conductivity loss is smaller than 1.5% IACS, and the aluminum rod is suitable for the fields of high-voltage transmission wires and new energy automobile cables.

The invention belongs to the technical field of gear heat treatment, and discloses a rotary kiln large gear heat treatment process optimization system and method. The method comprises the following steps: carrying out normalizing forging on a pre-selected material twice to obtain a grain-refined pre-selected material, processing the grain-refined pre-selected material to obtain a gear, and carrying out vacuum nitriding treatment on the naturally cooled gear to obtain a first gear; carrying out gradient quenching treatment on the first gear to obtain a second gear; the second gear is subjected to carburizing treatment and isothermal tempering treatment, and a third gear is obtained; presetting a scanning range, a scanning step length and a scanning speed, and collecting an X-ray diffraction pattern, neutron diffraction data and an eddy current signal on the surface of the third gear; stress can be effectively eliminated, tempering and other process parameters are dynamically adjusted, the whole heat treatment process is in an accurate and controllable state, and gear performance is comprehensively improved.

The invention discloses a preparation method of an ultrahigh-toughness large-length-diameter-ratio deep blind hole component. The preparation method comprises the following steps: preparing an ultrahigh-toughness steel bar, preparing a large-length-diameter-ratio deep blind hole blank, carrying out toughening treatment on the obtained blank, and then carrying out precise cutting processing to obtain the ultrahigh-toughness large-length-diameter-ratio deep blind hole component. The ultrahigh-toughness large-length-diameter-ratio deep blind hole component prepared through the scheme is low in impurity content, the grain size is remarkably refined, almost no component segregation exists, the internal quality grade of the component is grade A through ultrasonic flaw detection, the impact absorbing energy of all parts of the component is not lower than 80 J, the structure uniformity and the performance consistency are high, and the advantage of being high in material utilization rate is further achieved.

The invention discloses a hundred-bone refined grain meal and a preparation method thereof. The nutritional powder is prepared from the following raw materials in parts by weight: 4.70 to 4.75 parts of maltodextrin, 12.5 to 12.8 parts of soybean protein isolate, 9.2 to 9.4 parts of soybean meal, 9 to 9.2 parts of maltitol, 9 to 9.2 parts of black bean meal, 9.5 to 10.5 parts of resistant dextrin, 5 to 5.2 parts of rice meal, 3.9 to 4.1 parts of black rice, 2.9 to 3.1 parts of coix seeds, 2.20 to 2.24 parts of oat, 2 to 2.2 parts of oat bran, 2 to 2.2 parts of konjak, 1.9 to 2.1 parts of red beans, 1.9 to 2.1 parts of round-packed semen plantaginis husks and 4.9 to 5.1 parts of 196 mixed materials, the nutritional powder is prepared from the following raw materials in parts by weight: 1.9 to 2.1 parts of white kidney bean powder, 4.9 to 5.1 parts of sedum aizoon, 1.6 to 1.8 parts of red dates, 4.9 to 5.1 parts of whey protein, 2.4 to 2.6 parts of milk basic protein, 0.49 to 0.51 part of compound fermented fruit and vegetable powder, 0.05 to 0.15 part of phaseolus calcaratus, 0.05 to 0.15 part of poria cocos, 0.05 to 0.15 part of selenium-enriched malt flour, 0.05 to 0.15 part of soybean peptide type II, 0.005 to 0.015 part of a guarana extract and a turmeric extract. The invention can reduce the body weight of people and supplement protein, and has the effects of low calorie, high protein, physique improvement, chronic disease conditioning and the like.

The invention relates to hydrogen embrittlement-resistant 1200 MPa-grade dual-phase steel and a preparation method, and belongs to the technical field of steel manufacturing. The dual-phase steel comprises the following chemical components in percentage by mass: 0.1%-0.15% of C, 0.2%-0.6% of Si, 2.2%-2.6% of Mn, less than or equal to 0.01% of P, less than or equal to 0.005% of S, 0.02%-0.05% of Al, 0.1%-0.6% of Cr, 0.1%-0.4% of Mo, 0.01%-0.04% of Nb, 0.02%-0.05% of Ti and a matrix element Fe. A certain amount of Mo element is added, a small amount of (Ti, Mo) C is segregated at the grain boundary to be separated out so as to strengthen the grain boundary, improve the hydrogen diffusion barrier and reduce the damage capacity of hydrogen to a material, a certain amount of Nb element is added to form a large amount of nanoscale precipitates, refined grains and uniform structures, meanwhile, a large amount of hydrogen traps are provided, diffusion of hydrogen is hindered, and finally good hydrogen embrittlement resistance is obtained.

This invention relates to the field of high-strength cold-rolled steel sheet preparation technology, and particularly to a cold-rolled 780 grade DH steel with refined grains and uniform microstructure, and its production method. The chemical composition of the steel, by weight percentage, is: C: 0.08%–0.12%, Si: 0.4%–0.6%, Mn: 1.6%–2.0%, Nb: 0.02%–0.04%, P≤0.012%, S≤0.005%, Ti: 0.01%–0.02%, Als: 0.025%–0.050%, N≤0.0035%, with the balance being Fe and unavoidable impurities. The ferrite grain size in the steel of this invention is 5–8 μm, with a grain size standard deviation ≤1.2 μm, solving the problem of uneven microstructure. The finished steel has a tensile strength ≥780 MPa, elongation after fracture ≥22%, and earing rate ≤1.5%, meeting the requirements of complex deep drawing.

The present invention provides fine grain structures for rare earth permanent magnets (REPMs) and their production in a manner to significantly enhance flexural strength and fracture toughness of the magnets with no or little sacrifice in the hard magnetic properties. The tough REPMs can have either homogeneous or heterogeneous refined grain microstructural architectures achieved by introducing a small amount of additive particle materials into the magnet matrix, such as fine-sized, insoluble, chemically stable, and non-reactive with the magnet matrix. These additive materials can act effectively as both heterogeneous nuclei sites and grain growth inhibitors during the heat treatment processes, which in turn resulting in refined grain structures of the REPMs. Alternatively, the fine grain structures were also achieved by using magnet alloy feedstock powders with finer particle sizes. The fine grains acting as the strengthening sites can inhibit the crack nucleation and can also slow down the propagation of micro-cracks, which in turn increasing magnet's fracture toughness.

The present invention discloses a method for manufacturing a turbine mold shell with refined grains for investment casting, comprising the steps of preparing a coating, the coating comprising a surface coating, a transition coating, and a back coating; applying the surface coating; applying the transition coating; applying the back coating; dewaxing the mold shell; and sealing the inner and outer edges of the pouring nozzle. This investment casting silica sol mold shell manufacturing process reinforces the granular filler bonded to the inner and outer edges of the pouring nozzle by adding an inner and outer slurry sealing process to the pouring nozzle, preventing the granular filler on the pouring nozzle from falling into the mold shell. The mold shell coating is divided into three different coatings, and the surface coating uses a finer-grained cobalt aluminate powder additive, thereby increasing the smoothness of the mold shell surface layer, making the surface layer more dense, resulting in a mold shell with refined grains on the inner surface, thereby making the cast turbine casting a fine-grained casting with a smoother surface and higher precision.

The invention provides a treatment method of a hard alloy material, which comprises the following steps: cooling a hard alloy sample from 20 DEG C to-190 DEG C within 210-420 min; after cooling, carrying out heat preservation for 2 hours in a liquid nitrogen atmosphere of-190 DEG C; and after heat preservation, heating and tempering to 30 DEG C, and preserving heat for 1 hour. By means of the treatment method, the number of refined grains of the treated hard alloy material is increased, and the content of the grains with the grain size smaller than 0.5 micrometer is increased.

The invention relates to the technical field of steel for a casing pipe and a pipeline for hydrogen storage and transportation and a preparation process of the steel, and provides a casing pipe and a preparation method of the casing pipe, and the casing pipe comprises the following components in percentage by mass: 0.08-0.12% of C, less than or equal to 0.3% of Si, 0.6-0.8% of Mn, less than or equal to 0.010% of P, less than or equal to 0.005% of S, 0.6-1.2% of Cr, 0.6-0.8% of Mo, 0.01-0.05% of Nb, 0.05-0.08% of V, 0.05-0.15% of Ti, 0.001-0.003% of Ca, 0.002-0.009% of Re and the balance of Fe. By adding Cr, Mo, Nb, V, Ti and other refined grain sizes and steel purified Ca, rare earth Re and other elements, the cleanliness of the pipe body is high, the structure grains are fine, and the grain size reaches the level 9 or above. The yield strength is 655-724 MPa, the tensile strength is larger than or equal to 700 MPa, the ductility is larger than or equal to 25%, the transverse impact energy at the temperature of 0 DEG C is larger than or equal to 190 J, and the longitudinal impact energy at the temperature of 0 DEG C is larger than or equal to 220 J. Under the environment that the total pressure is 5MPa and the mixed medium of 10% hydrogen and 90% methane, the pulling / pressing alternating load R is equal to-1, the cycle number is 1 * 10 < 5 >, the fatigue strength sigma-1 of the pipe is larger than or equal to 485MPa, and the requirement for long-term use of the pipe in an underground hydrogen storage warehouse is met.