73results about How to "Increase the granular structure" patented technology

The invention discloses a method for improving the high-cycle fatigue performance of a Ti6Al4V titanium alloy, and belongs to the technical field of metal material processing, and the method comprises the following steps: S1, determining shot peening strengthening parameters based on material performance parameters and related standards; according to the method, high-amplitude residual compressive stress is introduced through shot peening strengthening, the stress state of the surface and the depth direction of the material is changed, accordingly, crack extension can be restrained, the fatigue life is prolonged, in addition, a plastic deformation layer is induced to be generated under the surface depth in the shot peening process, the microstructure of the material is improved, and the anti-fatigue performance of the material is improved; through femtosecond laser shock, surface defects can be effectively removed, the surface compactness can be improved, microcracks can be reduced, and a refined grain structure can be generated, so that the strength and toughness of the material are further enhanced, the high-cycle fatigue performance of the material is further improved, the two are combined, the residual stress state is optimized, and the surface integrity is improved. The fatigue performance of the Ti6Al4V titanium alloy is remarkably improved.

The invention discloses low-alloy NM600-grade wear-resistant steel and a preparation method thereof. The preparation method comprises the following steps: KR desulfurization and smelting treatment; refining and continuous casting treatment; heating and hot rolling treatment; slow cooling and cutting treatment; quenching and tempering treatment; the low-alloy NM600 wear-resistant steel with the hardness of 570-630 HBW is prepared through performance regulation and control treatment, a base body of the low-alloy NM600 wear-resistant steel is nanoscale martensite, and nanoscale precipitated phases and high-density dislocation clusters are distributed in martensite laths. By optimizing chemical components and strictly controlling smelting and heat treatment processes, the wear-resistant steel has excellent wear resistance. Refining of a martensite phase and uniform distribution of a precipitated phase are achieved, and the abrasion resistance and the crack resistance of the steel are further improved. By introducing trace elements such as Nb, Ti and the like, nanoscale precipitated phases such as (NbxTiy) C, NbC, TiC and the like are formed in martensite laths, so that the strength, hardness and wear resistance of the material are greatly improved, and the service life of the steel is prolonged.

The invention belongs to the technical field of water-absorbing material preparation, and provides a crop straw-based degradable water-absorbing resin as well as a preparation method and application thereof. The method comprises the following steps: pretreating crop straws by using an alkaline solution to obtain straw cellulose; the preparation method comprises the following steps: mixing straw cellulose, a first ethanol solution and a first alkali liquor for a first reaction, then adding a second ethanol solution and chloroacetic acid for a second reaction, and then adding a second alkali liquor for a third reaction to obtain straw cellulose sodium carboxymethyl; and mixing the straw cellulose sodium carboxymethyl, acrylic acid, an initiator, a cross-linking agent and water, and reacting to obtain the crop straw-based degradable water-absorbent resin. According to the method disclosed by the invention, a reaction inert structure in the straw cellulose can be removed, a crystalline region of the cellulose is destroyed, a homogeneous reaction preparation system is constructed, the grafting efficiency of the water-absorbent resin is improved, complete degradation of the water-absorbent resin is realized, and the production cost of the water-absorbent resin is also reduced.

The invention belongs to the technical field of agriculture, and particularly relates to a method for improving thin, thin and hard black land to make nutrients and moisture efficiently utilized, in particular to a method for improving thin, thin and hard black land to make nutrients and moisture efficiently utilized. According to the method for improving the thin, thin and hard black land and improving the efficient utilization of nutrients and moisture of the thin, thin and hard black land, aiming at the characteristics of thin and hard land parcels, wide-narrow-row crop rotation, straw returning to the field and organic fertilizer applying are adopted, straw returning to the field and organic fertilizer applying are adopted to supplement soil organic matter, and a strip ploughing technology is adopted on a machine tool, so that the yield of the soil is increased; soil is not moved in a large area, and a strip tillage machine is only adopted to perform strip tillage operation at the seedling zone to form a seedbed structure with the upper part open and the lower part solid; an intertillage and deep scarification technology is adopted, a deep scarification machine for efficiently utilizing water and fertilizer in a thin and hard black soil area is used, a plow pan is broken, upper water and lower water are communicated, a rat channel component is arranged, a rat channel is formed after deep scarification, a small reservoir and a soil layer are formed below a plough layer, straw is fully returned to the field, organic fertilizer is additionally applied, and soil hardening and water and soil loss are reduced. The organic matter content and activity of the black soil layer are gradually recovered.

The invention belongs to the technical field of material science, and discloses a shape optimization method for a high-temperature alloy disc type pre-forged piece. According to the method, finite element numerical simulation, a support vector machine and a genetic algorithm are combined, a GA-SVR prediction model between an input variable and a target function is established, the optimal value of the target function is predicted, and the optimal geometric parameter combination of the pre-forged piece is obtained. Firstly, the shape of a pre-forged piece is preliminarily designed through experience, then a finite element simulation result is extracted to establish a data set, parameters of a support vector machine model serve as a target function of a genetic algorithm by means of the data set, the parameters of the support vector machine model are optimized by means of the genetic algorithm, and an optimal prediction model is obtained. And for the size parameter combination of the pre-forged piece when the best deformation uniformity evaluation index is obtained, the deformation uniformity of finish forging is effectively improved through global optimization of the genetic algorithm, so that the final performance of the forged piece is improved.

The invention discloses a saline-alkali soil improvement method based on a low-salt organic material. The method comprises six steps of saline-alkali soil detection, organic material selection, organic material pretreatment, organic material application, soil irrigation and soil pH value adjustment. According to the steps of organic material pretreatment and organic material application, it is ensured that the saline-alkali soil fertilization improvement effect is good, the method has the advantage of being good in improvement effect, and the problems that in the using process of an existing saline-alkali soil improvement method, in the using process, low-salt organic materials are inconvenient to efficiently improve the saline-alkali soil, and the soil quality is poor are solved. The problems that if low-salt organic materials cannot be fully utilized, the soil improvement effect may not be obvious, soil salinity cannot be effectively reduced, the soil structure cannot be effectively improved, supplement of the organic materials is lacked, the organic matter content of the soil is difficult to increase, and the fertility and the water and fertilizer retention capacity of the soil are affected are solved.

The invention relates to the technical field of stainless steel, in particular to a high-hardness stainless steel band which comprises a stainless steel band body, a primary nitriding treatment nitride layer, a laser cladding high-entropy alloy layer and a secondary nitriding treatment nitride layer. The laser cladding high-entropy alloy layer is obtained by cladding alloy powder on the stainless steel band with the primary nitriding treatment nitride layer through laser, and the alloy powder comprises iron, cobalt, nickel, aluminum and vanadium elements with equal molar weight. The high-hardness stainless steel band has the effect of improving the strength, hardness, wear resistance and corrosion resistance of the stainless steel band, and the high-hardness stainless steel band can keep good working performance for a long time in a severe working condition environment.

The invention discloses a high-entropy alloy composite coating material and a preparation method thereof. The method comprises the following steps: weighing powder according to the proportion of the high-entropy alloy composite coating material, and carrying out high-energy ball milling under the protection of inert gas to obtain mixed powder; preparing a high-entropy alloy coating by adopting a laser cladding process for the obtained mixed powder; and the prepared high-entropy alloy coating is subjected to heat treatment, the heat treatment temperature ranges from 800 DEG C to 1300 DEG C, the heat treatment time ranges from 1.0 h to 1.2 h, water quenching is conducted to the room temperature after heat treatment is finished, and the high-entropy alloy composite coating material is obtained. The eutectic high-entropy alloy coating is prepared through a laser cladding process method, the microstructure of the coating is changed through heat treatment and addition of ceramic particles, the hardness, wear resistance and corrosion resistance of the coating can be improved while the FCC + BCC double-phase eutectic microstructure in the coating is kept, and the coating has the advantages of being high in mechanical strength, good in corrosion resistance and the like. And the process can be adjusted according to application requirements to obtain high-entropy alloy coatings with different properties, and industrial application is facilitated.

The invention discloses a high-corrosion-resistance high-conductivity electroplated palladium / gold-plated palladium-copper bonding wire and a production process thereof, and relates to the technical field of bonding wires, in order to improve the corrosion resistance of the bonding wire, the bonding wire is improved by modifying a core material and preparing a composite coating; according to the method, firstly, the core layer is improved, the corrosion potential of a core material is greatly improved by adding graphene into the core layer, the copper core has good heat dissipation performance and high-temperature conductivity, heat is prevented from being accumulated and heated in the bonding wire, and on the basis, the coating is improved, so that the corrosion resistance of the copper core is improved, and the service life of the copper core is prolonged. The surface appearance of an electroplating coating is improved by reducing the concentration of metal ions in an electroplating solution, increasing a pore filling agent and performing pulse current electroplating, diffusion layers are formed between the graphene copper alloy core and different electroplating layers through annealing treatment, the bonding strength between the graphene copper alloy core and the different electroplating layers is improved, and the use performance of the bonding wire is improved.

The embodiment of the invention discloses a high-strength corrosion-resistant CuNi10Fe1Mn alloy copper pipe and a preparation method thereof, relates to the technical field of non-ferrous metal material manufacturing, and aims to solve the technical problem of poor production in the prior art. According to the high-strength corrosion-resistant CuNi10Fe1Mn alloy copper pipe, the content of Ni ranges from 9.0% to 11.0%, the content of Fe ranges from 1.0% to 2.0%, the content of Mn ranges from 0.5% to 1.0%, the sum of impurity elements does not exceed 0.2%, and the balance is Cu.

The utility model discloses annealing equipment for stainless steel plate production, which comprises a box body, a door plate arranged on one side of the box body, a cooling assembly arranged in the box body, a mounting box arranged on the box body, an extraction assembly arranged on one side of the mounting box, a conversion assembly arranged in the mounting box, a fixing plate arranged on one side of the fixing plate, and an inclined pipe arranged on one side of the fixing plate. A sponge block is arranged on the other side of the fixing plate and connected with one end of a mounting frame, a sponge block is also arranged at the other end of the mounting frame, an extrusion plate is arranged at the end of the sponge block, a condensation pipe is mounted in the mounting frame, a drainage pipe is arranged on one side of the mounting box, and a driving mechanism is arranged in the mounting box. According to the annealing equipment for stainless steel plate production, water vapor is conveniently recycled through the conversion assembly, so that water resources are saved, a sponge block can be regularly extruded through an extrusion plate driven by a motor, absorbed water is discharged, and the water vapor treatment efficiency is further improved.

This invention discloses a slow-release fertilizer suitable for lateritic soils in Hainan, comprising a fertilizer core and a coating layer; the fertilizer core comprises the following raw materials in parts by weight: 10-20 parts isobutylene diurea, 1-3 parts 3,4-dimethyl-1H-pyrazole dihydrogen phosphate, 1-3 parts dicyandiamide DCD, 20-30 parts humic acid, and 30-50 parts organic fertilizer; the coating layer comprises the following raw materials in parts by weight: 5-10 parts natural nanotube halloysite, 3-5 parts bentonite, 5-10 parts cyclodextrin, 1-3 parts polyglutamic acid, 1-3 parts wood vinegar, and 5-10 parts polyacrylamide. The isobutylene diurea, humic acid, and organic fertilizer of this invention can effectively replenish organic matter and nitrogen in iron-aluminate soil, maintain soil nitrogen levels, and effectively control the conversion of ammonium nitrogen to nitrate nitrogen in lateritic soil, thereby reducing nitrogen loss and achieving a stable supply of nitrogen. In addition, polyglutamic acid and polyacrylamide have strong water retention capacity, and the fertilizer core is coated with a coating layer to achieve slow release and water retention.

The invention relates to the technical field of soil improvement, and discloses a garden soil composite improver and a preparation method thereof. The soil composite improver comprises, by weight, 12-15 parts of fermented organic fertilizer, 9-20 parts of modified water-retaining adsorbent, 24-30 parts of biochar, 5-8 parts of plant ash, and 1.2-2 parts of a microbial mixture. The soil composite improver has good adsorption to heavy metal ions, can effectively remove heavy metal ions in the soil, and has excellent fertilizer and water retention, and can maintain the nutrients in the soil for a long time. It has excellent air permeability and water retention, can keep the soil loose and moist, improve soil compaction, improve soil air permeability and soil activity, provide necessary air and water for the growth of plant roots, and each component complements and promotes each other, synergizes and enhances efficiency, and can effectively improve the quality of garden soil.

The invention discloses a method for improving the wear resistance of a porcelain glazed brick by using artificial gemstone solid waste, and relates to the technical field of ceramic tile preparation. The invention relates to a method for improving the wear resistance of a porcelain glazed brick. The porcelain glazed brick is prepared from a glazed material containing artificial gem solid waste. The polishing glaze comprises the following raw materials in parts by weight: a parts of potassium feldspar (40 < = a < = 46), b parts of dolomite (10 < = b < = 13), c parts of washed soil (8 < = c < = 12), 8-10 parts of strontium carbonate, d parts of quartz (6 < = d < = 9), e parts of calcined talc (8 < = e < = 10), f parts of zinc oxide (4 < = f < = 6), g parts of aluminum oxide (1 < = g < = 3), 1-3 parts of wollastonite and h parts of artificial gemstone solid waste (2 < = h < = 5), and a + b + c + d + e + f + g = 89. According to the invention, the artificial gem solid waste is introduced into the formula of the polishing glaze, so that the pollution of the solid waste in the artificial gem industry can be reduced, the material cost of the polishing glaze is reduced, the wear resistance of the glazed brick can be improved, and a green and sustainable ecology is constructed.

The application belongs to the technical field of laser additive manufacturing, and particularly relates to an array type laser additive manufacturing method and device, which comprises the following steps: S1, digital model import and layering slicing; S2, scanning path planning and filling setting; S3, array type laser synchronous output control; S4, powder flow and powder feeding path control; S5, according to the width of the additive, the width of single track cladding is adjusted in real time; S6, according to the slice layer material of the additive, the matching material is delivered; S7, S1-S6 are repeated, and layer-by-layer accumulation is performed until the part manufacturing is completed. The application can accurately control the grain size, improve the material microstructure, and improve the mechanical properties; the generation of defects such as thermal cracks and pores is reduced, the stability of the deposition process is ensured; the interlayer bonding is optimized, the quality of multi-layer deposition is ensured; the residual stress is reduced, the size precision, shape stability and fatigue performance of the part are improved; the post-processing requirement is reduced, and the processing cost is reduced.

The invention discloses a forming method of a composite aluminum material for deep drawing of a refrigerator liner, comprising: preparing an aluminum alloy, and preparing the refrigerator liner by combining a segmented deep drawing forming technology with a rapid cooling technology. The invention reduces the degree of single deep drawing deformation by segmented deep drawing of an aluminum alloy billet, thereby reducing the internal stress and defects of the aluminum alloy billet, helping to maintain the original structural integrity of the aluminum alloy billet, avoiding the destruction of the heat conduction path caused by rapid deformation, thereby maintaining the continuity of the heat conduction path, and further refining the grain structure of the material and reducing the residual stress by combining with the rapid cooling technology, thereby further improving the thermal conductivity of the material and significantly enhancing its hardness and mechanical strength.

The invention relates to the field of metal processing, and provides a horizontal continuous casting production process of a large rotor winding double-hole copper bar, which remarkably improves the product quality and the production efficiency through innovative design and optimization. The process mainly comprises the steps of raw material preparation, smelting, heat preservation, horizontal continuous casting, casting blank forming, cold rolling, drawing, aftertreatment, quality inspection and the like. Wherein in the raw material preparation stage, the material performance is optimized by accurately controlling the proportion of alloy elements, for example, 0.03%-0.1% of silver, 0.02%-0.05% of magnesium, 0.03%-0.08% of zirconium and 0.02%-0.06% of chromium are added. And the uniformity is ensured by adopting a double-frequency induction technology for smelting. The innovation of the horizontal continuous casting link is particularly prominent, the crystallizer body made of high-heat-conductivity-coefficient copper alloy is matched with the high-purity isostatic pressing graphite double-hole mold, and accurate segmented cooling control is achieved. The most characteristic is that the middle cooling structure effectively solves the problem of non-uniform cooling in the solidification process of the double-hole copper bar by forming a spraying outlet in the rear half section of the mold rod and adopting a high-frequency pulse spraying technology.

The invention discloses a process for producing boron nickel by a carbon thermal method of a submerged arc furnace, comprising the following steps: S1, preparing the following raw materials by weight: 90-100 parts of nickel oxide, 100-110 parts of boric acid, 5-15 parts of petroleum coke, 75-85 parts of wood chips, and 1-5 parts of high-purity aluminum particles; S2, according to the weight parts described in S1, putting the boric acid, nickel oxide, wood chips and high-purity aluminum particles into a drying furnace, while the temperature is 180-200°C, and the petroleum coke and wood chips are used as combustion raw materials of the drying furnace; S3, drying the dried boric acid, nickel oxide, wood chips and high-purity aluminum particles. The pure aluminum particles are transferred to a rotary kiln for pre-reduction, and petroleum coke and wood chips are added to the high temperature zone of the rotary kiln, and the temperature is controlled between 780-830°C. After processing for 3-5 hours, a pre-reduction charge is obtained; S4, the pre-reduction charge is sent to a submersible thermal electric furnace for smelting at 1800°C for 10-24 hours; S5, and then refined at 1750°C for 30-60 minutes, and bottom oxygen is blown for 20-30 minutes through an oxygen blowing mechanism during refining; S6, after refining, it is naturally cooled for 30-60 minutes, and a casting operation is performed to obtain a boron-nickel alloy.

The invention discloses an ecological revetment maintenance agent based on reed residues, a preparation method and application, and belongs to the technical field of revetment construction. The curing agent is prepared from the following components in parts by weight: 40 to 50 parts of reed extracting solution, 1 to 2 parts of fertilizer, 8 to 20 parts of polyaspartic acid, 0.1 to 0.3 part of calcium chloride, 0.2 to 0.5 part of sodium silicate and 1 to 3 parts of water. Uniformly mixing the reed extracting solution with a fertilizer and polyaspartic acid to obtain a premix; dissolving calcium chloride and sodium silicate in water, uniformly mixing, pouring into the premix, and uniformly stirring to obtain a mixture; and compressing the mixture into particles by adopting a granulating machine to obtain the ecological bank protection curing agent. The ecological bank protection curing agent prepared by the invention not only has the characteristics of reducing the nitrogen leaching loss of bank slope soil, increasing soil nutrients, promoting plant growth and the like, but also is rich in raw material source, green, pollution-free, simple to operate, low in cost and capable of realizing resource utilization of organisms.

The invention discloses a renewable waste Cr target preparation method and a regenerated Cr target, and belongs to the technical field of target material preparation. The method comprises the following steps: firstly, removing stains on the surface of a used waste Cr target through a grinding machine, a common lathe or numerical control, further crushing the used waste Cr target into coarse particles of 1-3 microns through a jaw crusher, then crushing the coarse particles into fine powder in a range of 60-325 meshes through a jet milling manner, mixing the fine powder with 3N-grade Cr powder with the same mesh number according to a ratio of (60-80%): (20-40%), and carrying out extrusion molding to obtain a finished product. And finally, sintering in a hot isostatic pressing manner. The density of the prepared regenerated Cr target is larger than or equal to 99%, the oxygen content is smaller than 1000 ppm, and the hardness ranges from 150 HV to 180 HV. According to the invention, the waste Cr target resource is effectively utilized, the utilization rate of the Cr target is improved, and the application cost of the Cr target in the high-tech fields of microelectronic manufacturing, optical coating and the like is reduced.

The present invention relates to a cold heading forming process for a stud, and in particular to a copper alloy stud for a new energy DC motor guide and a cold heading forming process thereof. The present invention significantly improves the wear resistance, fatigue resistance and forming accuracy of the stud by adding trace elements such as yttrium, lanthanum, magnesium, titanium, zirconium, boron, etc. to an aluminum bronze matrix material, and by adding nano-tungsten carbide and nano-alumina particles, combined with double-step heat treatment and segmented multi-step cold heading forming, thereby meeting the high performance requirements of new energy DC motors for studs.

The invention relates to a manufacturing method of an ultrahigh-strength and high-toughness Ti-6Al-4V alloy plate. A preparation process comprises a high-temperature solution treatment process, a large-deformation rolling process and a structure ultrafine gradient heat treatment process. Compared with the prior art, the average grain size of the prepared ultrafine lamellar structure Ti-6Al-4V alloy ranges from 150 nm to 400 nm, the yield strength is not lower than 1200 MPa, the tensile strength is not lower than 1500 MPa, and the ductility is not lower than 8.0%. The composite material has ultrahigh strength and high toughness, and shows good comprehensive mechanical properties. According to the technology, the structure is refined through conventional equipment and a production technology, lamellar structure refining can be achieved, a large number of separated nano-particles are dispersed and distributed in a matrix, the comprehensive mechanical property of the alloy is remarkably improved, the technology is simple and easy to implement, common industrial equipment can be used for implementation, the production efficiency is high, and industrial production and application are easy.

The invention discloses an ecological protection method for a down-dip water-containing rock slope, which relates to the technical field of ecological protection slope protection, and sequentially comprises ecological restoration of the slope surface of the slope and ecological restoration of the platform surface of the slope, ecological restoration of the slope surface sequentially comprises the steps of slope surface cleaning, drilling and vine planting, water drainage hole forming and vegetation concrete spraying of a base layer and a surface layer. The ecological restoration of the platform surface sequentially comprises the steps of cleaning the platform surface, laying an impermeable layer, building an enclosure retaining wall, planting oriental arborvitae and Japanese creeper in the enclosure retaining wall, building a soil retaining ridge, planting ridge plants, arranging a soil covering layer and planting traditional Chinese medicine plants. The greening of the slope surface can be accelerated by using the vegetation concrete and the drilling planting rattan; the slope rock mass is effectively prevented from sliding along the bedding, meanwhile, the down-dip slope is greened, and the ecological protection effect of an existing down-dip rock slope is improved.

The application discloses a fastening assembly and a preparation method thereof, a battery device and an electric equipment, and relates to the technical field of batteries. The battery device comprises a first structural member and the fastening assembly. The fastening assembly comprises a first connecting part and a second connecting part. The first structural member has a first side end and a second side end, and is formed with a clearance hole penetrating in the first direction. The first connecting part is arranged at the first side end and is formed with an embedded groove. The groove opening of the embedded groove is opened towards the first direction and is communicated with the clearance hole. The second connecting part is arranged at the second side end and is formed with an embedded protrusion. The embedded protrusion extends into the groove opening of the embedded groove through the clearance hole and is embeddedly connected with the embedded groove. A fastening connecting part is arranged on the first connecting part or the second connecting part. According to the technical scheme, the fastening connecting part is arranged on the first structural member in the embedded connection mode of the first connecting part and the second connecting part, so that the setting difficulty is reduced, and meanwhile, the connection reliability of the first structural member is ensured.

The invention discloses a special compound fertilizer for saline-alkali soil rice and a preparation method thereof, and belongs to the technical field of fertilizer preparation. Comprising the following raw materials in parts by weight: 30-50 parts of nitrogen fertilizer, 10-15 parts of calcium superphosphate, 8-12 parts of modified attapulgite, 50-80 parts of biomass straw, 1-3 parts of trace elements, 0.5-2 parts of amino acid, 2-4 parts of bacillus subtilis, 3-5 parts of silicate bacteria, 2-5 parts of salt-tolerant azospirillum brasilense and 10-20 parts of desulfurized gypsum. The preparation method comprises the following steps: 1, weighing the raw materials in parts by weight, and stirring and mixing the biomass straws, the trace elements, the amino acids, the bacillus subtilis, the silicate bacteria and the salt-tolerant azospirillum brasilense to obtain a premix; 2, continuously stirring and mixing the premix, nitrogen fertilizer, calcium superphosphate, modified attapulgite and desulfurized gypsum to obtain a mixture; and 3, granulating the mixture, and drying to obtain the compound fertilizer capable of promoting crop growth and improving the soil quality of the saline-alkali soil.

The invention discloses a method for cultivating carya illinoensis, which comprises the following steps of: before germination of a walnut tree, applying a base fertilizer into soil around the walnut tree by adopting a radial furrow method, and irrigating the root of the walnut tree; when the walnut tree sprouts, applying a compound fertilizer by adopting an annular furrow application method; applying the special controlled-release fertilizer for walnuts to the walnut trees once by adopting a radial furrow method from a flowering period to a growth mature period of the walnut trees. According to the method, the walnut trees are reasonably fertilized in each growth stage of the walnut trees through a radial strip ditch method and an annular ditch application method, the utilization rate of the soil for fertilization in different stages is improved, the situation that nutrients cannot be completely absorbed in a short time is avoided, and a large amount of nutrients are accumulated in the soil or permeate into the ground or fixed in the soil; the carya illinoensis tree body is poor in growth, and the yield of the carya illinoensis is influenced.

The invention discloses a rolling and cooling process for Nb-containing medium-carbon hub bearing steel, which relates to the technical field of steel production and sequentially comprises the following procedures of heating, rough rolling, continuous rolling, temperature holding, pre-finish rolling, finish rolling and cooling. Wherein in the heating process, the continuous casting billet comprises the following chemical components in percentage by mass: 0.53 to 0.58 percent of C, 0.20 to 0.35 percent of Si, 0.75 to 0.90 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.005 percent of S, 0.20 to 0.35 percent of Cr, 0.05 to 0.050 percent of Al, 0.10 to 0.20 percent of Nb and the balance of matrix Fe and inevitable impurities. According to the controlled rolling cooling process of the Nb-containing medium-carbon hub bearing steel, the actual hot rolling grain size of finished round steel is larger than or equal to 5 grades, the austenite grain size is larger than or equal to 8.0 grades, and the hot rolling state hardness is smaller than or equal to 235 HB.

This application relates to the field of ITO target technology, and discloses a highly uniform ITO target and its preparation method. The highly uniform ITO target comprises the following raw materials in parts by weight: 96.5-99.5 parts of ITO powder and 0.5-3.5 parts of Cu / Ni nanocomposite; wherein the weight ratio of indium oxide to tin oxide in the ITO powder is 8.8-9.3:1. This application uses specific raw materials and proportions to prepare an ITO target with excellent comprehensive performance, effectively solving the problems of uneven internal microstructure and easy deformation, warping, and cracking during sintering of existing targets.

The invention relates to the technical field of straw returning machines, and discloses a mountain corn straw returning machine and a straw returning method.The mountain corn straw returning machine comprises a machine shell, a connecting piece is arranged at the upper end of the machine shell and used for being fixedly connected with the driving end of a tractor and the like, a smashing piece is arranged in the machine shell and used for conducting smashing operation on corn straw, and a feeding port is formed in the front end of the machine shell; a feeding port is formed in the front end of the machine shell, a feeding plate is arranged at the front end of the machine shell, the feeding plate is correspondingly arranged on the front side of the feeding port, a discharging port is formed in the lower end of the machine shell, and a walking piece is arranged on the side wall of the machine shell. And the method can effectively cope with landforms with larger slopes or more rocks, greatly expands the application range, can cope with operation requirements under different topographic conditions, and has the characteristics of strong practicability and good stability.

The invention discloses a casting method of a wind generating set shell with a high heat dissipation effect, and relates to the technical field of wind power generation. The method comprises the steps of material preparation and pretreatment; 2, manufacturing and processing a mold; 3, smelting and pouring; 4, forming and cooling; 5, subsequent heat treatment; the smelting and pouring process comprises the following steps: 1, metal smelting; 2, purification treatment; 3, preheating the mold; 4, vacuumizing and mold filling; and 5, boosting and maintaining the pressure. Molten aluminum alloy liquid is pressed into a mold cavity for casting through the pressure difference, the solidification process of a casting is more uniform and stable by controlling the low pressure, the cooling rate is greatly reduced, refining of the internal microstructure of the material is achieved, and then the high-performance shell material is obtained. The fine grain structure formed by rapid solidification is beneficial to improving the heat conduction performance and the mechanical performance of the material, so that the heat dissipation capability of the shell is improved, and the shell of the wind generating set can dissipate heat more effectively in the using process.