57results about How to "Improve internal quality" patented technology

The invention belongs to the technical field of manufacturing and detection of composite material parts, and particularly relates to a device and a method for manufacturing defects of a reference block for nondestructive testing of a carbon fiber part. The punches are integrated through the stretchable supporting rod, the stamping rod and the tool rotating disc, rapid replacement of the punches is achieved, meanwhile, stamping-wrapping integration is achieved, the outline precision of the cutting edge of a polytetrafluoroethylene film is guaranteed by pressing the punches downwards, the polytetrafluoroethylene film directly falls into tinfoil above a wrapping pressing nozzle after a partition plate is opened, and the production efficiency is improved. The wrapping pressing nozzle is controlled by the knob, and the tightening degree can be adjusted according to different diameters, so that the defect precision and the defect quality can be ensured by adopting the tool structure. By the adoption of the method, hard mistake proofing in the combined process is optimized, the efficiency of manufacturing the defects, especially the small-diameter defects, is improved, meanwhile, the shape follow-up degree and the wrapping compactness of the tinfoil wrapping polytetrafluoroethylene film are guaranteed, the internal quality of the defects is improved, and the manufacturing stability is improved.

The invention discloses a smelting process for regulating and controlling C-class and D-class inclusions of heavy rail steel through magnesium treatment, and belongs to the technical field of ferrous metallurgy. Smelting is carried out according to given components and a production process, the smelting process comprises the steps of converter smelting, LF refining, VD vacuum treatment, magnesium treatment and continuous casting, and the generation type and distribution of inclusions in the heavy rail steel are accurately regulated and controlled mainly by adding a proper amount of magnesium-containing cored wires in the last stage of smelting. Most inclusions in the heavy rail steel exist in the form of fine dispersed calcium-silicon-magnesium-aluminum-oxygen composite inclusions. According to the smelting process, large-size C-class and D-class inclusions with the size larger than 10 micrometers can be eliminated, intragranular acicular ferrite can be induced to be formed in the solidification process, grains are refined, the performance is improved, and the performance and quality of the heavy rail steel are improved.

The invention provides a composite material blade, a forming combined mold and a preparation method. The composite material blade comprises an upper outer layer, a lower outer layer, an inner continuous layer and a filling area, the forming combined mold is used for preparing the composite material blade and comprises a core mold, a cushion layer block, an outer compaction block and a filling strip, and the preparation method comprises the following steps that the outer surface of the core mold is laid with a composite material layer, mold pressing shaping is conducted, and the inner continuous layer is prepared; paving a composite material layer outside the inner continuous layer, and carrying out mould pressing and shaping to prepare one of an upper outer layer and a lower outer layer; paving a composite material layer at the joint of one of the upper outer layer or the lower outer layer and the inner continuous layer, and carrying out mold pressing shaping to prepare a filling area; and paving a composite material layer on the outer sides of the filling area and the inner continuous layer, and carrying out mold pressing shaping to prepare the other one of the upper outer layer and the lower outer layer. According to the method, the composite material blade with good internal densification quality and internal and external molded surface size precision can be simply and efficiently prepared.

The invention provides a shell-based mechanical metamaterial design strategy based on level set function weighted combination. The framework is inspired by a three-period minimal curved surface, and a shell-based mechanical metamaterial database is constructed by adopting a level set function weighted combination strategy. The effective elastic performance of the metamaterial is evaluated through the homogenization theory of voxel modeling. A back propagation neural network model is developed, and the model can realize reverse mapping between geometric parameters and material attributes of a shell base unit. In addition, the reliability of the homogenization theory is verified by adopting a quasi-static compression test, and the effective elastic characteristic and the compression response of the shell-based structure are evaluated. Research results show that the shell-based mechanical metamaterial not only shows isotropic elasticity and high rigidity exceeding the upper limit of the Hashin-Shtrikman theory, but also has significantly improved yield strength and energy absorption ability under compression. According to the design, a series of light-weight and high-rigidity-strength structures are finally formed, and 3D printing forming is conducted through the PolyJet technology.

The utility model discloses an automobile brake caliper support casting mold which comprises a mold cavity, a casting cavity is arranged in the mold cavity, vertical pouring gates are arranged on the two sides of the casting cavity, the upper ends of the vertical pouring gates are connected with second transverse pouring gates, the upper ends of the second transverse pouring gates are connected with pouring cups, and the lower ends of the second transverse pouring gates are connected with second transverse pouring gates. According to the casting mold for the automobile brake caliper support, the situation that molten iron turbulent flow sand washing is caused when molten iron is poured into a casting can be effectively reduced, and the appearance quality and the internal quality of the casting are improved.

The invention provides a frame type three-dimensional structure composite material forming mold, and belongs to the field of mold design and manufacturing. And a series of problems of high integral forming difficulty, multiple internal defects and the like of the longitudinal beam reinforced composite cabin are solved. The core mold, the flange plate, the inner split part, the outer split part, the upper flange, the lower flange and the outer pressurizing frame part are designed, the form and position precision of the mold is guaranteed through positioning, limiting and connecting screws of all the parts, and the purpose of integrated forming of a product is achieved. The method is mainly used for integrally forming the frame type three-dimensional structure composite cabin. By means of the frame type three-dimensional structure composite material forming mold, frame type composite material integral forming can be achieved, and the continuity of fibers is guaranteed.

The invention discloses a stepped casting system for an engine cylinder block, and belongs to the field of casting. According to the technical scheme, the stepped casting system for the engine cylinder block comprises a main pouring gate part, the main pouring gate part comprises a transverse main pouring gate, a plurality of branch pouring gate parts are arranged below the transverse main pouring gate, each branch pouring gate part comprises a first vertical pouring gate, the first vertical pouring gates are connected with middle pouring gates, the other ends of the middle pouring gates are connected with branch pouring gates, and the branch pouring gates are connected with the transverse main pouring gate. The shunting pouring gate is vertically arranged, the lower end of the shunting pouring gate is connected with a first inner pouring gate, and the upper end of the shunting pouring gate is connected with a second inner pouring gate. In the casting process, liquid metal is divided into two layers and enters a cavity in a stepped mode, scouring to the cavity is relieved, liquid metal mold filling is stable, exhausting of the cavity is facilitated, after mold filling, the temperature of the liquid metal at different height positions is guaranteed, the liquid metal mold filling speed is high, the liquid metal mold filling is stable, and solidification is balanced; the occurrence of slag holes, air holes, sand holes and shrinkage porosity defects which are not easy to find is greatly reduced, and the casting yield is improved.

The invention relates to a contrast enhancement type optical fiber image inverter and a preparation method thereof. The preparation method comprises the following steps: drawing contrast enhancement type filter glass into a light absorption wire; matching the skin material glass tube with the core material glass rod, and drawing into a monofilament and a round white filament; the drawn monofilaments are arranged into a primary composite rod with an orthohexagonal cross section, and triangular holes of the primary composite rod are evenly filled and inserted with light absorption filaments and round white filaments; drawing the combined primary composite rod into a primary multifilament; arranging the primary multifilaments into secondary composite rods with orthohexagonal cross sections, drawing the secondary composite rods into secondary multifilaments, cutting the secondary multifilaments in a fixed-length manner, and arranging the secondary multifilaments into rows of screen plate sections; and carrying out hot melt pressing forming and torsion forming to obtain the contrast enhancement type optical fiber image inverter. The contrast-enhanced optical fiber image inverter prepared by the method has the advantages of high resolution, high contrast, clear imaging, uniform transmittance, excellent internal quality and the like.

The invention relates to a low-compression-ratio S355NL super-thick steel plate with the thickness larger than 250-300 mm and a manufacturing method of the low-compression-ratio S355NL super-thick steel plate. The steel plate comprises the chemical components of 0.08%-0.12% of C, 0.20%-0.40% of Si, 1.45%-1.65% of Mn, smaller than or equal to 0.005% of P, smaller than or equal to 0.001% of S, 0.02%-0.05% of Al, 0.02%-0.05% of Nb, 0.03%-0.06% of V, 0.25%-0.45% of Ni, 0.01%-0.03% of Ti and the balance Fe and inevitable impurity elements, and the carbon equivalent Ceq is smaller than or equal to 0.45%. A large-thickness thick continuous casting slab is adopted for production, and the rolling compression ratio is smaller than 2.0. The internal quality and mechanical properties of the steel plate meet the requirements that the yield strength is larger than or equal to 275 Mpa, the tensile strength is larger than or equal to 450 Mpa, the percentage elongation after fracture is larger than or equal to 22%, the transverse Charpy impact energy unit value at the temperature of-50 DEG C is larger than or equal to 100 J, and the thickness direction tensile area reduction rate is larger than or equal to 35%. And the UT flaw detection of the steel plate can meet the NB / T47013.3 I grade requirement. The metallographic microstructure of the steel plate is a uniform and fine ferrite and pearlite structure.

This invention discloses a low-pressure casting and heat treatment process for high-strength and high-toughness aluminum alloy used in contact wire ratchet, belonging to the field of rail transit component manufacturing technology. The process uses AlSi7Mg0.3 alloy, obtaining high-purity aluminum liquid through two refining and modification treatments. In the low-pressure casting stage, a three-stage pressure control is adopted: the first stage is the liquid-raising stage, the second stage is the mold-filling stage, the third stage is the pressure-increasing and shrinkage-compensating stage, and finally, pressure holding and cooling are performed; followed by T6 heat treatment. This invention solves the casting problems of easy air entrapment in ratchet teeth and easy shrinkage porosity in the hub. The casting has a tensile strength ≥275MPa and a breaking load ≥94.5kN, meeting the requirements for a 2×10 contact wire ratchet. 5 Secondary fatigue load requirements.

The present application relates to the technical field of composite material forming, in particular to a kind of off-site gas flow guide method of composite material vacuum bag forming.It includes the following steps: after impregnating off-site flow guide agent using non-woven grid cloth, drying, preparing off-site gas flow guide net;Off-site gas flow guide net is laid in the interlayer interval of prepreg, and is cured with prepreg in the curing process.The purpose of the off-site gas flow guide method of composite material vacuum bag forming is to solve the problem of internal quality defects such as porosity that easily occurs in the vacuum forming and curing process when forming large thickness composite material using large tow high weight prepreg, reduce material process cost by reducing the number of laid layers, effectively improve the production efficiency of existing large thickness composite material products.

The present application belongs to the technical field of metal material casting and rolling, and discloses a vertical casting and rolling pouring system, which comprises a front box, a closed channel assembly arranged below the front box, a casting nozzle arranged at the bottom end of the closed channel assembly, a second runner arranged at one side of the front box, a downspout arranged at the end of the second runner away from the front box, a first runner arranged at the top end of the downspout, a first flow control device arranged at the pouring position of the first runner, and a second flow control device arranged at the pouring position of the front box. The serpentine channel composed of the first, second and third stop blocks arranged in the inner cavity of the casting nozzle can realize stable metal liquid supply. The pouring system has simple structure, convenient installation and debugging, and is suitable for mass production. In the vertical direction, the slag and bubbles in the metal liquid can float upwards and prevent entering the product, thereby improving the internal quality of the product.

The application provides a cover structure of a composite material heat curing device, which comprises a side wall, an upper cover arranged at the top of the side wall, a first rubber plate arranged at the bottom of the side wall, and a closed cavity formed by the upper cover, the side wall and the first rubber plate. A plurality of shunt pipes are arranged in the cavity and connected with air outlets of a hot air machine. The shunt pipes are provided with a plurality of air outlets in communication with the cavity. An air outlet pipe is in communication with the cavity at one end and with the outside at the other end. The cover structure cooperates with a box body of the heat curing device to play the roles of heating and pressing the preform as a negative mold. Compared with the forming mode of rigid negative mold and positive mold cooperation or the mode of vacuum bag film pressing, the cover structure uses a flexible rubber plate as the negative mold, the rubber plate is better in the effect of sticking to the mold after being heated and expanded to press the preform, the preform is more uniform in stress during the curing process, and the internal quality of the product is better. The rubber plate is more versatile in pressing, and the same rubber plate is applicable to the forming of products of different sizes without the need of manufacturing negative molds of different sizes.

The invention provides a forming process of a complex special-shaped section launching barrel. The forming process comprises the following steps of production preparation, forming of a functional layer and an inner pipe body, filling of a guide sliding groove and forming of an outer pipe body, overall curing and pre-pipe-hoop forming and aftertreatment. According to the invention, a sharp and complex geometrical shape is converted into a curved surface in smooth transition through the pretreatment procedure of filling wires into the guide chute, so that a perfect base is provided for the subsequent laying of a structural layer, and the hidden danger of overhead is fundamentally eliminated; a vacuum bag technology is combined with hand lay-up forming, and a silicone rubber block is used in a key area for local sealing and flow guiding. According to the combined process, uniform compaction pressure can be applied within the range of the whole structure, interlayer bubbles and redundant resin are efficiently removed, a product with high compactness and low porosity is obtained, and the reliability of consistency of mechanical properties of the product is greatly improved.

The invention discloses Q460C-grade angle steel with a low compression ratio and a production method of the Q460C-grade angle steel. The angle steel comprises the following chemical components in percentage by weight: 0.17 to 0.20 percent of C, 0.30 to 0.40 percent of Si, 1.35 to 1.55 percent of Mn, 0.070 to 0.085 percent of V, less than or equal to 0.020 percent of P, less than or equal to 0.020 percent of S, 0.41 to 0.46 percent of CEV, 0.0120 to 0.0150 percent of N and the balance of Fe and inevitable impurities. The production method comprises the steps of KR pretreatment, converter smelting, LF refining, continuous casting, heating and profile steel rolling. The Q460C-grade angle steel with the compression ratio ranging from 4.7 to 6.0 can be produced, the yield strength ReH of the angle steel is larger than or equal to 470 MPa, the tensile strength Rm is larger than or equal to 630 MPa and smaller than or equal to 680 MPa, the impact property KV2 at the temperature of 0 DEG C is larger than or equal to 34 J, and the percentage elongation after fracture A is larger than or equal to 18%.

The application discloses a continuous casting method of heavy section beam blank with high axis crystal rate, which comprises the following steps: controlling the superheat of the molten steel ΔT; controlling the pouring speed of the molten steel Vc; carrying out electromagnetic stirring on the web and the flange of the secondary cooling zone; controlling the secondary cooling intensity, the cooling water amount of each section and the distribution of the cooling water amount of each surface; and reasonably distributing the cooling area of each section to produce the heavy section beam blank with the axis crystal rate of 40-55%. The method is suitable for the heavy section beam blank with the weight of more than 1.5 tons per meter.

The invention discloses a pressurizing and curing method for a light III-type winding composite gas cylinder for a respirator, which comprises the following steps: S1, material preparation and pretreatment: materials comprise a fiber material and resin; s2, uniformly winding the fiber material on the surface of the gas cylinder through a preset winding process; and S3, the wound gas cylinder is pressurized and cured. According to the pressurization curing method for the light III type winding composite gas cylinder for the respirator, the problems that in an existing curing process, the weight and the performance are difficult to consider, the internal quality is poor, and the production efficiency is low are solved, and the composite gas cylinder which is light, high in performance, safe and reliable is produced.

The invention discloses a tail end electromagnetic stirring dynamic control method, system and equipment for continuous casting CrMo steel, and belongs to the technical field of ferrous metallurgy continuous casting. The method comprises the steps that firstly, working condition parameters such as the superheat degree of tundish molten steel and the casting speed of a casting machine in the continuous casting process are collected in real time; then inputting the working condition parameters into a preset F-EMS dynamic parameter matching model, and matching to obtain optimal F-EMS working parameters under the current working condition, including a working mode, current intensity and frequency; and finally, F-EMS equipment is controlled to operate according to the matching parameters, and feedback optimization is conducted on the model according to the quality result of the produced casting blank. According to the method, the working condition-parameter dynamic matching relation is established and applied, the problem that fixed F-EMS parameters cannot adapt to production fluctuation is solved, real-time accurate matching of the stirring effect and the casting blank solidification state is achieved, the high-quality CrMo steel continuous casting blank free of white bright bands and controlled in center segregation can be stably produced, and the production efficiency is improved. And the homogeneity and the stability of the internal quality of the product are obviously improved.

The present invention belongs to the technical field of battery diaphragm production, and in particular to a shaping device for battery diaphragms. Aiming at the problem that uneven extension under the same pulling force is caused by uneven cooling of the base film during the stretching process, the following scheme is proposed, including a processing box with a cavity in a rectangular structure, the vertical side walls on both sides of the processing box are provided with rectangular holes of the same height, one is a feed port and the other is a discharge port, a strip hole is provided above the feed port, and a shaft is rotatably connected to the bottom inner wall of the processing box near the feed port. The present invention can clamp the extruded base film while performing a swinging pull when the extruder is working, avoiding the traditional pulling in the same direction with a constant pulling force that cannot overcome temporary resistance. This pulling method can effectively avoid the pulling jam caused by temporary changes in resistance caused by temperature differences or other factors during pulling.

The present invention relates to a streamlined vibration quenching nucleation device and operation method, the device comprising: a crystallizer, arranged below an immersed water inlet at the bottom of an external tundish; a liquid metal cooling pool arranged on the side of the crystallizer; a cooling fan arranged on the side of the liquid metal cooling pool, thereby cooling the liquid metal cooling pool; a quenching nucleator arranged inside the crystallizer and connected with the liquid metal cooling pool, the quenching nucleator being streamlined; a cooling pipeline arranged between the liquid metal cooling pool and the quenching nucleator; a variable frequency pump arranged in the cooling pipeline; a vibration generator sleeved in the cooling pipeline and arranged between the variable frequency pump and the quenching nucleator; a baffle assembly arranged inside the quenching nucleator. The present invention sets the quenching nucleator to a streamlined shape, reduces the thickness of the solidified structure on the surface of the quenching nucleator, promotes the peeling of the crystal nucleus and the melting of the dendrite, increases the number of equiaxed crystal nucleus particles, and improves the internal quality of large continuous casting billets.

The utility model provides a pouring system of a magnesium alloy shell casting with a window structure, which comprises a shell cavity, the shell cavity comprises a cylindrical body and a window part arranged on the side of the cylindrical body, a sprue is arranged below the shell cavity, and a cross gate is arranged on the sprue; a vertical tooth-shaped pouring gate is arranged at the position, corresponding to the cylindrical body, of the transverse pouring gate, and a vertical door-shaped pouring gate is arranged at the position, corresponding to the window part, of the transverse pouring gate; the vertical tooth-shaped pouring gate is connected with the side wall and the top of the cylindrical body through a gap type flow gate, the shape of the vertical door-shaped pouring gate corresponds to that of the window part, and the vertical door-shaped pouring gate is connected with the side wall of the window part through the gap type flow gate. A feeding channel is completely opened, shrinkage cavities and looseness are avoided, the internal quality of castings is improved, and the one-time casting forming qualification rate of products is guaranteed.

The invention relates to an RPS steering gear shell die-casting technology. The technology comprises the following steps that S1, early-stage work preparation is conducted, wherein die design and pouring and discharging system design are included; s2, determining a die-casting water cooling process; s3, die-casting production; s4, demolding; by reasonably designing the die and the process, application of the RPS complex shell in the die-casting process is achieved, compared with traditional gravity casting, molten metal is pushed by an injection punch, the higher-speed mold filling and high-pressure solidification process is completed, and the ideal product internal quality is obtained; the ADC12 aluminum alloy automobile steering system castings with unequal wall thicknesses and complex structures are produced through the method, and the defects of air holes, shrinkage cavities in hot spots and the like caused by air entrapment in the high-speed filling process are effectively overcome.

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

This invention discloses a low-cost rare earth weathering steel and its production process. The chemical composition and mass percentage of the weathering steel are as follows: C 0.06%~0.12%, Si 0.25%~0.50%, Mn 0.60%~1.00%, P 0.07%~0.12%, S≤0.005%, Cu 0.15%~0.40%, Cr 0.30%~0.50%, Ce 0.002%~0.015%, Alt 0.020%~0.050%, Ti 0.02%~0.08%, N≤0.006%, with the balance being Fe and unavoidable impurities. This weathering steel uses rare earth oxides added to refining slag, and a high-alkalinity, low-oxidizing refining process to improve rare earth yield. Rare earth inclusions and nozzle turbulence are modified through calcium-magnesium composite treatment, achieving rare earth micro-alloying to replace high-alloy additions. While meeting the mechanical properties and high corrosion resistance of 355MPa grade weathering steel, it significantly reduces alloy costs by more than 15% compared to traditional weathering steel. The process flow is compatible with existing production lines and is suitable for industrial mass production.

This invention relates to the field of composite material preparation technology, and in particular to a method for preparing high-viscosity, medium-temperature curing epoxy resin castings. Using high-viscosity, medium-temperature curing epoxy resin as raw material, this invention employs a press pre-compression molding-autoclave curing process to prepare epoxy resin castings with excellent mechanical properties and density. Furthermore, this preparation method is simple, highly operable, safe, and widely applicable, effectively improving the internal quality and stability of high-viscosity epoxy resin castings, and is of great significance for promoting the overall performance improvement of epoxy-based composite materials.

The utility model relates to die casting mould technical field, especially a kind of vehicle aluminium shell die casting mould, including main mould, forming die, first driving device and second driving device, main mould includes upper die holder and lower die holder, and upper die holder and lower die holder are closed to form forming cavity, forming die is set in forming cavity, and forming die is by first fixed die holder, second fixed die holder, third fixed die holder, first movable die holder and second movable die holder, first fixed die holder is closed with second fixed die holder and third fixed die holder, and forms die casting cavity between each other, and the first direction of die casting cavity is provided with first movable slot, and the second direction is provided with second movable slot, and second movable die holder is set in second movable slot, and first movable die holder is set in first movable slot.The utility model effectively reduces the blowhole, shrinkage and other defects in the interior of aluminium shell, improves the internal quality and mechanical properties of aluminium shell.

The invention discloses a compression molding method for a quartz / phenolic aldehyde end of an embedded probe temperature sensor. The compression molding method comprises the following steps: molding and processing a probe temperature sensor protection bracket; packaging the probe temperature sensor; forming an end part; and machining the end part. According to the invention, the flexibility of the compression molding process, the designability of the material and the excellent ablation resistance of the quartz fiber and the phenolic resin are fully utilized, so that the problem that the operation cannot be carried out due to the characteristics of the molding process is avoided, and the preparation difficulty of a workpiece is reduced; the quartz / phenolic aldehyde composite material is adopted to replace a traditional conical metal piece to be internally arranged, so that the total mass of the end is greatly reduced; the formed product is high in size precision, good in internal quality and low in manufacturing cost, the overall pneumatic appearance structure of the end is not damaged under the condition that the requirement for normal use of the embedded probe type temperature sensor is met, and material selection and design of the end are obviously improved through force and heat test examination.

The invention discloses a laser remelting treatment method for an NbTi rod, and relates to the technical field of superconducting wire processing, and the laser remelting treatment method comprises the following steps: sampling on the NbTi rod, carrying out a laser remelting pre-experiment on an NbTi sample piece to obtain experiment results corresponding to different laser remelting process parameters, and selecting the optimal laser remelting process parameter according to the experiment results; carrying out laser remelting on the surface of the whole NbTi rod by adopting the optimal laser remelting process parameters; and the NbTi rod subjected to laser remelting is subjected to acid pickling. According to the NbTi / Cu composite wire, laser remelting is conducted on the surface of the whole NbTi rod, a large number of nanoscale grains and precipitated phases are introduced into the microstructure of the NbTi rod, more pinning centers can be formed during subsequent machining of the NbTi / Cu composite wire, the critical current density is improved, and meanwhile the NbTi / Cu composite wire has the advantages of being low in cost and short in period.

The application discloses a method for preparing oriented silicon steel and the oriented silicon steel, and the method comprises the following steps: continuously casting molten steel through a crystallizer to obtain a casting blank, wherein a unidirectional pulse current is applied to the molten steel in the crystallizer; hot-rolling the casting blank to obtain a hot-rolled coil; and carrying out subsequent treatment on the hot-rolled coil to obtain the oriented silicon steel. The unidirectional pulse current applied to the molten steel in the crystallizer can change the type and content of the metallographic structure in the casting blank, so that less or no banded structure is generated when the casting blank is subjected to a subsequent rolling process, thereby improving the magnetic properties and internal quality, such as linear crystal defects, of the prepared oriented silicon steel.

The application provides a high-silica / phenolic resin composite material and a preparation method thereof, and belongs to the technical field of composite materials. The preparation method of the high-silica / phenolic resin composite material comprises the following steps: performing desolventizing treatment on high-silica fiber / phenolic resin premix to obtain high-silica fiber / phenolic resin dry mix; performing pre-pressing treatment on the high-silica fiber / phenolic resin dry mix to obtain high-silica fiber / phenolic resin pre-pressing material; and laying a silicone rubber plate on the high-silica fiber / phenolic resin pre-pressing material, and then performing mold closing treatment, pre-curing treatment and curing treatment to obtain the high-silica / phenolic resin composite material. The preparation method provided by the application can realize the preparation of large-size composite materials without using a large-tonnage press during the mold pressing process, solves the problem that a large-tonnage press needs to be used for pressing during the preparation process of the existing large-size composite materials, and the prepared composite material has good internal quality stability, a small defect area and good popularization and application value.