915 results about "Fine grain" patented technology

A pore pressure prediction method for fine-grained hybrid sedimentary rock based on variable P-wave velocity includes: carrying out a P-wave velocity test of rock under different effective stresses, determining a function form of the relationship between acoustic velocity and effective stress, fitting the parameters in the function by optimization, and establishing an evaluation model of effective stress influence term by lithology. According to the measured formation pressure data and the effective stress influence term model, the acoustic velocity background value is deduced, the logging curve is preferred, and the acoustic velocity background value logging evaluation model is established. According to the logging curves of DT and DEN, combined with the lithology identification results, the acoustic velocity background value is calculated, and then the effective stress of the formation is obtained, and then the pore pressure is determined according to the overburden pressure.

The invention belongs to the technical field of alloy materials, and particularly relates to a preparation method of a fine-grain near-alpha high-temperature titanium alloy. The preparation method of the fine-grain near-alpha high-temperature titanium alloy comprises the following steps that (1) a construction platform of SLM machining equipment is filled with alloy powder, and SLM machining is started; during SLM machining, the laser power ranges from 260 W to 380 W, the scanning speed ranges from 1000 mm / s to 1500 mm / s, and the scanning interval ranges from 0.05 mm to 0.15 mm; the alloy powder is a mixture of Ti60 alloy powder, boron powder and iron powder; (2) sequentially carrying out destressing treatment, solution treatment and aging treatment on a product obtained by SLM processing; the temperature of the destressing treatment and the temperature of the aging treatment are independently selected from 600-1000 DEG C, the temperature of the solution treatment is 1000-1300 DEG C, and the temperature of the solution treatment is larger than the temperature of the destressing treatment and larger than the temperature of the aging treatment. By adjusting and controlling the laser power, the scanning speed and the scanning interval in the SLM machining and forming process and combining a reasonable and effective heat treatment process, the alloy material with the density superior to 99.95% is obtained.

The invention discloses a Cu-Cr-Zr-TiB2 copper-based composite material and a preparation method and application thereof. A blank containing TiB2 particles is subjected to rotary forging to obtain a rotary forging piece, the rotary forging piece is subjected to primary aging treatment and then subjected to electric pulse drawing to obtain a drawing piece, and then the drawing piece is subjected to secondary aging treatment to obtain the Cu-Cr-Zr-TiB2 copper-based composite material. According to the Cu-Cr-Zr-TiB2 copper-based composite material prepared through the preparation method, the copper matrix is of a gradient structure with the surface layer being a nanocrystalline layer of 50-200 nm and the core part being fine grains of 0.5-1 micron, TiB2 particle reinforced phases are distributed in the copper matrix in a fibrous mode in the axial direction, and Cr / Zr nano precipitated phases are distributed in gaps of the TiB2 particle reinforced phases and in crystals of the copper matrix in a dispersed mode; therefore, the high-hardness, high-strength, high-conductivity, high-softening-temperature, excellent high-temperature performance and excellent arc extinguishing performance are achieved.

A wear-resistant and low-friction coated piston ring and a preparation method therefor are provided. The OD surface diamond-like carbon coating consists sequentially of a first metal interlayer, a second metal interlayer, a gradient DLC layer, alternating high / low hardness DLC layers, and an outer running-in DLC layer. The side surface diamond-like carbon coating consists sequentially of a metal interlayer, a gradient DLC layer, and alternating high / low hardness DLC layers. The preparation method employs physical vapor deposition to sequentially deposit composite DLC coatings on the OD surface and side surface of the piston ring. The coating is a tetrahedral amorphous carbon structure, exhibiting good thickness uniformity and fine grain structure. This improves the wear resistance of the piston ring's OD surface and side surface, reduces the aggressiveness of the piston ring side surface against the piston ring groove, and meanwhile avoids adhesion.

The invention provides a fine grain flotation machine impeller of a three-layer structure, and relates to the technical field of ore dressing. The impeller comprises a framework disc, the outer end face of the framework disc is provided with a connecting flange used for being installed with a power component of the flotation machine in a matched mode, and the inner circumferential face of the framework disc is provided with a circle of outer-layer blades which are evenly arranged at intervals. A closed ring is arranged at the end, away from the connecting flange, of the framework disc, the bottom ends of the outer-layer blades are arranged on the inner side of the closed ring, and a circle of inner-layer blades are evenly arranged on the outer side of the center hole in the framework disc at intervals. A circle of middle blades which are evenly arranged at intervals and fixedly connected with the inner end face of the framework disc are arranged between the outer-layer blades and the inner-layer blades. The structure of the outer-layer blade, the framework disc and the closing plate forms a gradually-shrinking closed flow channel, so that the initial kinetic energy and local turbulent kinetic energy of mineral particles and bubbles are increased, the collision mineralization probability of the bubbles and the mineral particles is increased, the pressure at the outlet of a gradually-shrinking opening is released, nano-bubble precipitation is facilitated, and the recovery of micro-fine particle mineralization is improved.

The invention belongs to the field of stainless steel. Specifically, the invention relates to soft magnetic stainless steel containing Cr, Cu, Mo, Nb and rare earth elements, and a soft magnetic stainless steel profile and a product prepared from the soft magnetic stainless steel. The Cu element contained in the soft magnetic stainless steel can be separated out to form nano Cu when the soft magnetic stainless steel is subjected to aging treatment, so that the mechanical property of the obtained soft magnetic stainless steel profile can be effectively improved, and the soft magnetic stainless steel profile has excellent low-temperature toughness and soft magnetic property; in addition, microalloy precipitation is optimized through Nb and rare earth element compounding, so that the proper fine grain size is obtained, and the soft magnetic stainless steel profile has excellent low-temperature toughness; and meanwhile, the tensile strength of the soft magnetic stainless steel profile is improved through the solution strengthening effect of Mo, and the corrosion resistance of the soft magnetic stainless steel profile is improved. The soft magnetic stainless steel profile can be effectively applied to electromagnetic valves and related products which serve in low-temperature media and require certain strength, and has good popularization prospects and application value.

The invention relates to a high-permeability ultralow-coercive-force soft magnetic stainless steel heat treatment process which comprises the following steps: in a nitrogen atmosphere, firstly heating a hot-rolled wire rod to 900-950 DEG C at a heating rate of 30-50 DEG C / h, preserving heat for 4-6 hours to obtain a fine grain structure of equiaxial recrystallization ferrite, then cooling to room temperature at a cooling rate of less than or equal to 15 DEG C / h to homogenize the ferrite structure, and finally cooling to room temperature at a cooling rate of less than or equal to 15 DEG C / h to obtain the high-permeability ultralow-coercive-force soft magnetic stainless steel. The soft magnetic stainless steel is obtained. The method has the advantages that the maximum magnetic conductivity of the soft magnetic stainless steel is improved, the coercive force of the soft magnetic stainless steel is reduced, and the plasticity index of the soft magnetic stainless steel is improved.

The invention discloses a heat treatment method for improving the low-temperature impact performance of 12Cr13 martensitic stainless steel in the technical field of heat treatment. The heat treatment method comprises the following steps that S1, water quenching pretreatment is conducted, specifically, a forge piece is heated to 940-960 DEG C, and heat preservation is conducted for 1-2 h; s2, quenching cooling: after heat preservation of the forge piece is finished, discharging and water-cooling; s3, quenching and heating: heating the forge piece to 830-850 DEG C, and keeping the temperature for 1-2 hours; s4, quenching cooling: discharging and water-cooling the forged piece after heat preservation is finished; s5, high-temperature tempering is conducted, specifically, the forge piece is heated to 600-680 DEG C, and heat preservation is conducted for 3.5-4.5 h; and S6, tempering and cooling, wherein after heat preservation is finished, discharging and air cooling are conducted, and cooling is conducted to the room temperature. According to the method, the material fastener forge piece is subjected to water quenching pretreatment and fine grain treatment, then the fastener forge piece is heated at the temperature lower than the conventional austenitizing temperature for subcritical quenching, a small amount of retained austenite structures are obtained, and the 0 DEG C impact toughness of the 12Cr13 material fastener forge piece is improved.

The invention discloses a processing method of a high-toughness stainless steel / carbon steel composite plate, which comprises the following steps: compounding a high-strength carbon steel plate and a stainless steel plate through a rolling compounding process under the action of laser-assisted heating; then, the stainless steel / carbon steel composite sheet is subjected to temperature control type online periodic laser surface annealing treatment, so that a corrosion-resistant structure with a non-uniform structure in which coarse grains (a soft region) and fine grains (a hard region) are alternately arranged can be obtained on the stainless steel surface layer, and the corrosion resistance of the composite plate is improved; and meanwhile, the stress relief effect induced by laser surface annealing treatment is combined with high-temperature tempering softening of a martensitic structure on the carbon steel side part at the interface, and a heterogeneous structure induced by laser surface annealing treatment can synchronously improve the obdurability of the stainless steel / carbon steel composite plate.

The invention belongs to the field of advanced metal plastic processing, and particularly relates to a difficult-to-deform metal ultra-thin strip rolling device and method.The device comprises an uncoiler, a high-strength rolling mill and a coiler which are sequentially arranged, and the inlet side and the outlet side of the high-strength rolling mill are each provided with a pair of equal-diameter rollers; the equal-diameter roller is composed of a copper conductive roller and a ceramic insulating roller, the copper conductive roller on the inlet side and the copper conductive roller on the outlet side are electrically connected to the positive electrode and the negative electrode of the pulse power source respectively, and a strip blank on the uncoiling machine sequentially penetrates through the equal-diameter roller on the inlet side, the high-strength rolling mill and the equal-diameter roller on the outlet side and then is wound on the coiling machine. And a working roll, which is in contact with the strip blank, on the high-strength rolling mill is an insulating ceramic working roll. The pulse current in the method can induce dynamic recrystallization, an ultra-fine grain or nanocrystalline structure is obtained, and the strength and plasticity matching of the product is superior to those of a traditional process. Meanwhile, long-time high-temperature oxidation can be avoided by adopting pulse current to heat the strip blank, and the surface is bright.

The invention provides a system calibration and verification method for a discontinuous graded cohesive soil DEM model. The system calibration and verification method comprises the following steps: (1) preliminarily determining microscopic parameter values of the DEM model; (2) sensitivity analysis of microscopic parameters of each DEM model; (3) gradually optimizing and iteratively analyzing each factor in combination with a sensitivity analysis result to obtain a microscopic parameter optimization value range of the DEM; (4) further optimizing the microscopic parameters of the DEM model based on Box-Behnken test design to obtain multiple groups of optimization parameter combinations; and (5) parameter verification. The method is reasonable in conception, integrates parameter calibration, precision verification and actual experiments, enables the purpose of parameter calibration to be clearer, can provide a more efficient and directional parameter calibration thought for cohesive soil with complex parameter calibration and fewer references, especially fine-grained soil or granular materials with extremely uneven grain size distribution, and is suitable for popularization and application. And meso-scale parameter calibration under quasi-static stress can be converted into parameter calibration and verification under dynamic load stress simulation.

The invention discloses a semi-solid ultrasonic rolling synchronous auxiliary electric arc additive manufacturing device and method, and the device comprises an ultrasonic rolling device, and further comprises an electric arc welding gun device, an automatic wire feeding device, a manipulator, a control system device, a protective gas cylinder and a clamp device. When semi-solid ultrasonic rolling synchronous auxiliary electric arc additive manufacturing is carried out, the electric arc welding gun is fixed to one mechanical arm, the synchronous ultrasonic rolling device is fixed to the other mechanical arm, and the two mechanical arms are controlled by the control system device to move synchronously. The invention provides a structure regulation and control method of applying ultrasound and rolling composite to a semi-solid area of an electric arc additive manufacturing near-molten pool, and utilizes stirring and cavitation effects of the ultrasound and a deformation-induced recovery recrystallization effect to promote escape of bubbles, effective welding of pores and full crushing and refining of dendritic crystals, so that the mechanical property of the electric arc additive manufacturing near-molten pool is improved. And finally, regulation and control of the compact equiaxed fine grain structure in electric arc additive manufacturing are achieved.

The invention discloses fine-grained soil in-situ permeability test equipment and a permeability coefficient determination method.The fine-grained soil in-situ permeability test equipment comprises a base, an adjusting sliding base is arranged at the upper end of the base in a sliding mode, a vertical sliding base is arranged above the adjusting sliding base and connected with a lifting mechanism, a rotating shaft rotating horizontally is arranged on the vertical sliding base, and a fixed base is arranged at the end of the rotating shaft; the outer side of the fixed base is connected with a rotating cylinder through a rotating outer ring, the two ends of the rotating cylinder are of opening structures, the upper end of the rotating cylinder is connected with a drilling cutter set used for drilling through a connecting frame, a rotating driving piece used for driving the rotating cylinder to rotate is arranged on the fixed base, and the rotating cylinder is connected with a water supply mechanism. All the components interact with one another, an in-situ permeability test of the fine-grained soil is carried out, and the permeability coefficient is measured. The problems that in the prior art, the permeability coefficient measuring process is not convenient enough, and measured data are not real enough are solved. And after the test is completed, the device can be quickly moved to the next test target position by utilizing the maneuverability of the device, so that the test efficiency is improved.

The invention belongs to the technical field of bimetallic composite materials, and provides a copper-aluminum bimetallic composite material and a preparation method thereof. The method comprises the following steps: coating an aluminum material with a copper strip, sealing through continuous electron beam welding, carrying out continuous equal channel angular extrusion on the copper-aluminum bimetallic material, carrying out heat treatment on the deformed copper-aluminum bimetallic material, and then carrying out extended extrusion or drawing to obtain the copper-aluminum bimetallic composite material. Aluminum is used for replacing part of copper, the overall weight of the material is reduced on the premise that the high conductivity of pure copper is kept, copper resources are saved, and the production cost is reduced. After ECAP extrusion, the strength performance of the material is improved by 3-5 times; after heat treatment, work hardening disappears, and subsequent machining treatment is facilitated; after expansion extrusion, the copper-aluminum bimetallic material is processed into a copper-aluminum bimetallic bar; and after further rolling and drawing, a bimetal plate or an ultra-fine grain wire is formed, and the material is restrained by a roller and a die hole to form an accurate size and a smooth surface.

The invention relates to an upper and lower roller reducing independent transmission universal rolling mill and a control method thereof, and belongs to the technical field of metallurgy. The rolling mill comprises a universal rolling rough rolling unit, a middle rolling unit and a universal rolling finish rolling unit which are sequentially arranged along a rolling line, a horizontal roller set of each unit is of an upper and lower roller reducing structure and is provided with an independent transmission system, and a gearbox and a transmission shaft are driven by an independent motor to achieve roller separation control. The middle rolling unit is a reducing edging mill, and temperature control units are arranged in front of and behind the rough rolling unit and the finish rolling unit respectively. The rolling method comprises the steps of adjusting the roller diameter ratio, synchronously adjusting the dip angle of the universal spindle and the basic height of the rolling mill, conducting gradient deformation rolling, dynamically adapting to a rolling model and the like. Through cooperation of independent transmission and reducing, accurate matching of the speeds of the upper roller and the lower roller is achieved, deformation uniformity is improved, the total motor power is reduced, an adjustable cooling nozzle and intelligent model optimization are combined, a product has the surface layer ultra-fine grain structure and core toughness, and the yield and market competitiveness are remarkably improved.

The medium-temperature radial forging method comprises the steps that pretreatment is conducted, specifically, a niobium-tungsten alloy extrusion bar blank is heated for 60-180 minutes at the temperature of 750-950 DEG C, rapid forging and straightening are conducted, and a medium-temperature radial forging bar blank is obtained and annealed for 60-120 minutes at the temperature of 1250-1450 DEG C; medium-temperature radial forging is conducted, specifically, a two-step method is adopted, in the first step, a bar blank is preheated to 80-100 DEG C and coated with Ta1350 high-temperature glass powder, heat preservation is conducted for 90-180 minutes at the temperature of 1050-1150 DEG C, and the bar blank is forged into a bar with the diameter of 70 + / -1 mm in the mode that the diameter is reduced by 7-10 mm every time; and in the second step, the heating and coating processes are repeated, the diameter is reduced by 5-7 mm every time, and the bar with the required specification is manufactured. By optimizing the medium-temperature forging and annealing process, the fine grain structure is controlled, the high-temperature mechanical property, creep resistance and oxidation resistance of the material are improved, and the material is suitable for aerospace engines and other high-temperature and high-pressure scenes. Compared with a traditional method, the technology improves the yield, shortens the production period, reduces the labor intensity, is suitable for large-scale production, reduces surface air suction, oxidation and burning loss, and improves the production efficiency and the finished product quality.

The invention belongs to the technical field of metal preparation, and particularly relates to a Fe-Al-Nb alloy and a preparation method thereof. Comprising the following steps: mixing ferric oxide, niobium pentoxide powder and a metal diluent, performing ball milling, and pressing into a green body; and the blank is put into a reaction kettle, then an ignition agent is added, protective gas is inflated, a self-propagating reaction is conducted at the temperature of 260-300 DEG C, and the Fe-Al-Nb alloy is obtained. The Fe-Al-Nb alloy is prepared through the self-propagating reaction, the reaction temperature is reduced, the thermal stress during forming is improved, the temperature of the self-propagating reaction is only 260-300 DEG C, meanwhile, the self-propagating reaction mode is adopted, the alloy is rapidly cooled after reacting, the fine grain strengthening effect is promoted to be more obvious, a microstructure of a Fe3Al matrix phase and a C14 Laves reinforced phase is formed, and the Fe-Al-Nb alloy is obtained. And the distribution of a reinforced phase is more uniform, and the wear resistance of the material is improved.

The invention belongs to the field of additive manufacturing, and particularly relates to an additive manufacturing method of a WC-reinforced high-entropy alloy-based composite material. According to the method, a used base material is Ti3Zr1. 5NbVAl0. 25 high-entropy alloy, WC powder is added into the base material, and the mixed powder of the Ti3Zr1. 5NbVAl0. 25 high-entropy alloy and the WC powder is rapidly melted and reacts through a high-energy laser beam to form a reinforcement phase so as to achieve the reinforcement effect. The molten powder is uniformly deposited on a substrate layer by layer to form a deposited composite material, and then the deposited composite material is subjected to proper heat treatment to obtain the solid solution composite material with excellent performance. The composite material prepared through the method is high in relative density and fine in grain, no obvious defects such as cracks and air holes exist in the composite material, and the strength, the hardness and the abrasion resistance are greatly improved compared with pure high-entropy alloy. The composite material can be used in the fields of aerospace, anticorrosive coatings, light alloys and the like, and is a green and efficient material preparation method.

The invention discloses a breathable anti-seepage structure layer suitable for roadbed slope protection. The breathable anti-seepage structure layer comprises a coarse grain layer, a fine grain layer, plant straw and a drainage ditch. The coarse-grained layer is laid on the roadbed slope, the fine-grained layer is laid on the coarse-grained layer, the plant straws are inserted into the fine-grained layer and are inserted into the interface of the fine-grained layer and the coarse-grained layer, and the drainage ditch is arranged at the position where the toe of the roadbed slope is in contact with the interface of the fine-grained layer and the coarse-grained layer; according to the invention, through two special methods of inserting the plant straws into the fine grain layer and doping the expansion material particles into the coarse grain layer, high air permeability and ultra-strong seepage prevention of the structural layer are realized, the problems of'pot cover effect 'and capillary retardation failure are effectively prevented, and the method has good economic, environment-friendly and social benefits.

The invention discloses a high-purity ruthenium target material for sputtering and a preparation method thereof, and belongs to the technical field of target material preparation. The density of the high-purity ruthenium target for sputtering is larger than or equal to 99.5%, the oxygen content is smaller than 200 ppm, and the average grain size of ruthenium is smaller than 10 micrometers. The preparation method comprises the steps that ruthenium powder is put into a die to be pre-pressed after being put into a vacuum hot-pressing sintering furnace, then under the vacuum condition, gradient heating is conducted to the sintering temperature of 1000-1200 DEG C, then heat preservation is conducted, gradient pressurization is conducted to the hot-pressing pressure of 35-40 MPa, hot-pressing sintering is conducted for 90-150 min, then furnace cooling is conducted, a ruthenium pre-target blank is obtained, the ruthenium pre-target blank is put into a hot isostatic pressing sintering furnace after being subjected to sheathing degassing, and the ruthenium target blank is obtained. And sintering for 3-5 hours at the temperature of 1300-1450 DEG C under the pressure of 110-160 MPa under the vacuum condition, cooling along with the furnace, recovering the pressure, and machining to obtain the finished ruthenium target with high density, high purity, low oxygen content and uniform and fine grain structure.

The invention relates to a multi-source iron-containing solid waste cold solid ball and a preparation method, and belongs to the technical field of solid waste treatment. The cold bonding ball comprises the following raw materials in parts by weight: 40-70 parts of iron-containing dust mud, 15-40 parts of a secondary metal material, 1-5 parts of a binder and 5-12 parts of a liquid modifier. A consolidation system with continuous and reasonable gradation is formed by utilizing pore filling of the fine-grained iron-containing dust mud and an aggregate bridging effect of the coarse-grained secondary metal material, so that the compactness and the compressive strength are improved; chloride ions in high-salinity wastewater are used for modifying raw materials, oxidation phase change of metal iron and low-valence iron oxide in a secondary metal material is promoted, a high-strength binding phase is generated, the compressive strength of the pellets is effectively improved, co-treatment of wastewater and multi-source solid waste is achieved, and under the condition that the cost of a binding agent is not additionally increased, the cost of the binding agent is reduced. And the cold consolidation strength of iron-containing solid wastes with different components is improved.

The invention belongs to the technical field of resource utilization of engineering residue soil, and particularly discloses an adjustable backfill material based on low-viscosity fine-grained soil and a preparation method of the adjustable backfill material. The adjustable backfill material comprises the following components in percentage by mass: 65-85% of low-viscosity engineering waste soil, 5-10% of a high-strength curing material system, 0-1% of a fluidity promoting material system, 0-1.5% of a compactness reinforcing material system and 5-25% of water, wherein the sum of the percentages of the components is 100%. According to the backfill material, low-viscosity fine-grained soil serves as base soil, three different material systems including a high-strength curing material system, a fluidity promoting material system and a compactness enhancing material system are doped, and cured soil with the properties of high fluidization, self-compaction, controllable strength, low permeability and the like is obtained; the raw materials of the backfill material are simple and easy to obtain, the process is simple and convenient, different engineering requirements can be met by regulating and controlling the proportion of different material systems, and the problems that the muck containing area is insufficient and the disposal cost is high can be effectively solved.

The invention discloses a shield muck heavy metal pollution intelligent sorting system and method based on multi-parameter online detection, and relates to the field of shield muck sorting, the shield muck heavy metal pollution intelligent sorting system comprises a muck sample pretreatment module, an online detection module, a pollution evaluation analysis module, a sorting execution module and a linkage control feedback module; the muck sample pretreatment module is used for separating coarse particles with the particle size larger than 50 mm and impurities in shield muck through a vibrating screen. According to the method, the initial value of the fine-grained soil content is detected in real time, data is automatically corrected based on a preset intelligent densimeter and a traditional densimeter difference correction model, rapid measurement is achieved, the detection efficiency is improved, a dynamic correlation model of fine-grained soil component changes is constructed by combining auxiliary parameters such as the muck weight, the water content and coarse grain grading, and the detection accuracy is improved. And the working condition adaptation module is linked to automatically improve the fine-grained soil detection frequency when the stratum mutation is identified by the shield PLC parameters, so that the data is ensured to closely follow the stratum change.

The invention relates to the technical field of nuclear fusion surface plasma W materials, in particular to nano rare earth oxide ceramic-Ti microalloy composite reinforced W powder, a composite material and a preparation method of the nano rare earth oxide ceramic-Ti microalloy composite reinforced W powder. The composite powder is of a nearly spherical core-shell hierarchical structure, and the particle size is 30-50 nm; according to the composite powder, refractory metal W serves as a matrix, nano rare earth oxide ceramic particles are evenly dispersed in matrix W crystal grains, Ti mainly forms an enrichment area on the surface of the matrix or a matrix / rare earth oxide interface in a simple substance or oxide mode, the phase interface structure is effectively improved, W crystal boundary migration and dislocation motion are hindered, W crystal grains are remarkably refined, and the composite powder is prepared. Part and W form semi-coherence, fine grain and interface strengthening and toughening are achieved, and a brand new thought and a technical method are provided for synergistically improving the strength and toughness of the W composite material. The composite powder is subjected to organic reduction synthesis and low-temperature reinforced sintering to prepare the composite material, the tensile strength at the room temperature reaches 500-610 MPa, and the ductility is 5%-8%.

The present invention relates to the technical field of heavy medium beneficiation, in particular to an all-particle-size heavy medium beneficiation system and beneficiation method. The system is characterized by comprising a grading unit, a heavy medium coarse fraction separation unit, a fine fraction desliming unit, a heavy medium fine fraction separation unit, and a fine fraction demediation / dehydration unit. The grading unit is a unit for dividing a material into a coarse fraction and a fine fraction. A coarse fraction outlet of the grading unit is connected to the heavy medium coarse fraction separation unit, and a fine fraction outlet of the grading unit is sequentially connected to the fine fraction desliming unit, the heavy medium fine fraction separation unit, and the fine fraction demediation / dehydration unit. The present invention overcomes the defects of the particle size lower limits of heavy medium separation and has advantages such as having a high selection comprehensive yield, a good separation effect, and low production costs, requiring little equipment investment, and being energy-saving and environmentally friendly.

The invention discloses intelligent forging equipment and method based on seamless steel pipe machining, and relates to the technical field of needing modification. The intelligent forging equipment comprises a titanium alloy cylindrical blank roller and a temperature control mechanism used for heating the titanium alloy cylindrical blank roller; a supporting and straightening mechanism used for conducting shaping and straightening on the titanium alloy cylindrical blank roller is arranged on one side of the interior of the temperature control mechanism, and a supporting frame is arranged on one side of the temperature control mechanism. Metal can be forced to flow through the hammering acting force of the forging hammer mechanism, small gaps and holes in the metal can be filled, air holes and shrinkage porosity in materials are reduced, the overall density of the materials is improved, potential stress concentration points are reduced, and therefore the reliability of the materials is enhanced; the titanium alloy is subjected to repeated plastic deformation, so that original coarse grains are crushed into finer grains, and grain refinement is beneficial to improving the strength and toughness of the material.

According to the production method, an extremely-cold fine grain layer with the thickness being 10 mm or above and a large-size rectangular blank are obtained by means of the large specific water flow of primary cooling water, and the two-phase region controlled rolling, rapid cooling and isothermal slow cooling processes are matched, so that the low-carbon free-cutting steel wire rod capable of being subjected to large-deformation cold heading is obtained. And a structure of fine grain ferrite with large deformability and a very small amount of sorbite is obtained, and the 1 / 3 cold upsetting non-cracking requirement is met. After the produced free-cutting steel wire rod is subjected to oxide scale removal, drawing sizing and blanking, direct large-deformation cold heading and punching machining can be achieved, and the requirement for high-speed cutting machining is met.

The composite force field magnetic separation column comprises a separation cone frustum, the separation cone frustum is of a hollow structure, and a magnet device and a rotating shaft are arranged in the separation cone frustum; the magnet device is cylindrical and is arranged between the sorting cone frustum and the rotating shaft, and the rotating shaft is movably connected with the magnet device; a sorting screw is wound on the outer side of the sorting cone frustum, a blade of the sorting screw is fixedly connected with the rotating shaft, and the sorting screw can rotate relative to the sorting cone frustum; the bottom of the rotating shaft is connected with the transmission device and used for driving the sorting screw to rotate. The bottom of the sorting spiral is close to the feeding belt, and materials on the feeding belt are conveyed upwards through rotation of the sorting spiral. And an air blowing device is arranged on one side of the separation screw, so that non-magnetic materials or weakly magnetic materials on the separation cone frustum or the separation screw are blown away from the separation screw, fall to a tailing falling area and are taken away from a working area through a tailing belt, and magnetic concentrate products at the uppermost end of the separation screw are conveyed to a concentrate product area through a concentrate belt.

The invention relates to a stirring friction pretreatment method for an aluminum alloy diffusion welding grain refinement surface, which comprises the following steps: starting from edge lines of a pair of to-be-welded surfaces of an aluminum alloy to-be-welded part, respectively carrying out multi-pass continuous equidistant stirring friction processing on the pair of to-be-welded surfaces, and ensuring that the translation overlapping rate of a stirring needle track between passes is 25-50%; during friction stir processing, water is continuously added for cooling, so that a spiral deformed fine grain layer with the grain size of 50-80 microns and the thickness of 1-2 mm is generated on a pair of to-be-welded surfaces at the position of a columnar stirring needle; and milling the pair of surfaces to be welded after the stirring friction processing is completed until the roughness is Ra 0.1-Ra 0.3, so as to obtain the aluminum alloy diffusion welding grain refinement surface. Compared with a welding seam obtained through a direct diffusion welding method, the welding seam obtained through the method has the higher welding rate and the higher strength, a new thought is provided for production and manufacturing of aluminum alloy, and the method has important significance in improving performance indexes and enhancing service reliability.

The invention discloses a preparation method of a tungsten-nickel target material for electrochromic intelligent glass, and relates to the technical field of tungsten-nickel target materials, and the preparation method comprises the following preparation steps: uniformly mixing N powder and W powder to obtain W-N mixed powder; the W-N mixed powder is put into a graphite mold to be flatly laid; putting the graphite grinding tool filled with the W-Ni mixed powder into a vacuum hot-pressing sintering furnace, firstly increasing the pressure to 6-10MPa, maintaining the pressure for 10-15min, and then releasing the pressure; the method comprises the following steps: vacuumizing a vacuum hot-pressing sintering furnace to below 5Pa, then carrying out three-stage heating to 1250-1300 DEG C, carrying out heat preservation for 30-60 minutes after heating is finished, then carrying out two-stage pressurization to 35-40 MPa, carrying out heat preservation and pressure preservation for 90-150 minutes, and then cooling to 100-200 DEG C along with the furnace to obtain a WNi alloy target blank; the temperature field is uniform through three-section heating, radial shrinkage is inhibited through pressure supplement, and finally, uniform and fine grain structures are obtained while the density of the target material is improved through a two-section pressurizing mode.