37results about How to "Reduce internal defects" patented technology

The invention belongs to the technical field of ceramic materials, and particularly discloses whisker toughened zirconium oxide-aluminum oxide composite ceramic and an additive manufacturing method thereof, the composite ceramic comprises the following components by mass: 94 parts of zirconium oxide toughened aluminum oxide ceramic and 5 parts of silicon carbide whisker; the zirconium oxide toughened aluminum oxide ceramic is prepared from the following components in parts by mass: 76 parts of aluminum oxide and 24 parts of zirconium oxide, and 3mol% of yttrium oxide is added into the zirconium oxide. According to the whisker toughened zirconium oxide-aluminum oxide composite ceramic and the additive manufacturing method thereof, the preparation method has unique design of components and process, and the preparation of a high-density and high-performance ceramic-based composite material part based on a fused deposition modeling technology is successfully realized. Further, the prepared silicon carbide whisker toughened zirconium oxide-aluminum oxide-based composite ceramic has relatively high density and excellent obdurability.

This invention discloses a method for preparing a novel ultra-high voltage high-performance composite insulating material, belonging to the field of composite insulating material preparation technology. The technical solution includes the following steps: S1, preparing a modified epoxy-silicone rubber composite resin matrix: 40-50 parts by weight of bisphenol A type epoxy resin (E-51) are placed in a reaction vessel, heated to 60-70℃, and continuously stirred at a stirring rate of 300-500 r / min. 10-15 parts by weight of terminal hydroxyl polysiloxane (molecular weight 5000-10000) are added, and the temperature is kept constant for 1.5-2 hours; subsequently, the system temperature is lowered to 40-50℃. The beneficial effects of this invention are: by setting up a resin matrix system of "terminated hydroxyl polysiloxane modified epoxy resin + nano-alumina / boron nitride composite reinforcement," the problem of imbalance between high voltage resistance and aging resistance in existing materials is solved. It exhibits significantly improved dielectric strength, greatly reduced dielectric loss, and excellent high and low temperature cycling performance, meeting the long-life operation requirements of ultra-high voltage equipment.

This invention belongs to the field of laser additive manufacturing technology, specifically relating to a dual-spot parallel scanning additive manufacturing system and method. A laser generation unit dynamically distributes a laser beam to the first and second optical paths according to a preset energy ratio through polarization beam splitting. The spot generation unit uses two spatial light modulators to modulate the two beams into patterned spots and dot spots respectively. The filtering and imaging unit filters and images the two beams. The parallel scanning unit drives the dual spots to scan synchronously on a powder bed. The control unit performs model slicing and patterned region segmentation, and dynamically allocates energy and synchronously controls all units to work together based on the segmentation results. This achieves a single laser, dual optical paths, irregularly shaped spots, and parallel scanning, simultaneously balancing processing efficiency and forming accuracy, effectively solving the technical problem of traditional single-spot methods that struggle to achieve both efficiency and accuracy.

The invention relates to the technical field of brake disc materials, and discloses a brake disc material prepared from a carbon-ceramic composite material and a processing technology thereof.The processing technology comprises the following steps that phenolic resin, carbon powder, metal oxide, composite carbon fibers and a pore forming agent are evenly mixed and then placed in a mold, and a composite material prefabricated body is obtained through compression molding and cold water demolding; processing the composite material preform to form a carbon-ceramic brake disc rough blank, and then performing carbonization treatment to obtain a carbonized composite material; and mixing the carbonized composite material with silicon powder, carrying out siliconizing treatment, soaking in a protective solution, sintering, taking out, polishing and perforating to obtain the brake disc material prepared from the carbon-ceramic composite material. The composite carbon fiber contains a large number of silicon hydroxyl groups and can be tightly combined with phenolic resin, carbon powder, metal oxide and a pore-forming agent, and the polycarbosilane layer generates a nanoscale silicon carbide phase, so that the mechanical property and wear resistance of the brake disc material prepared from the carbon-ceramic composite material can be improved.

The invention relates to the technical field of preparation of lead-free metal halide scintillator crystal powder, and particularly discloses chlorine zirconium cesium crystal powder for a composite scintillator and a confinement growth method of the chlorine zirconium cesium crystal powder. The cesium zirconium chloride crystal powder is cesium zirconium chloride-gas phase oxide composite powder formed on the micro-nano scale by means of in-situ crystallization, and the cesium zirconium chloride crystal powder is composed of 50-95.3 wt% of cesium zirconium chloride and 4.7-50 wt% of gas phase oxide. The preparation method comprises the following steps: preparing zirconium chloride-gas phase oxide powder, preparing a cesium chloride solution, mixing zirconium chloride-gas phase oxide slurry, and growing chlorine zirconium cesium crystal powder in an in-situ crystallization confinement range. The cesium zirconium chloride crystal powder prepared by the method has the advantages of adjustable particle size, stable suspension and efficient scintillation luminescence performance, solves the problem of crystal powder-polymer phase separation in a composite scintillator, and can be used for large-scale preparation of the composite scintillator in the field of radiation detection.

The utility model relates to steel ingot casting technical field especially no step heat preservation cap mouth structure, it includes mud cap mouth, iron cap mouth and heat preservation cover. Mud cap mouth is conical, and the inner chamber adopts octagonal plum blossom shape taper structure, and the taper range is 0.8% 1.5%, iron cap mouth includes circular ring and lug, and is installed in close cooperation with mud cap mouth, heat preservation cover is composed of stone wool heat preservation board and metal sheet, and covers in the periphery to reduce the cooling rate. The utility model discloses through optimizing the inner chamber shape and cancelling step structure, reduces stress concentration and slag inclusion defect, significantly improves the billet yield, is applicable to electric furnace ingot and other metal ingot casting process.

This application relates to the field of sensor encapsulation, specifically disclosing an encapsulation composition with both high hydrophobicity and easy permeability, its preparation method, and its application. The raw materials used include epoxy resin, a curing agent, and a hydrophobic additive in a weight ratio of 1:1:(3-4). The epoxy resin includes bisphenol A type epoxy resin or bisphenol F type epoxy resin. The hydrophobic additive is prepared from quartz sand and a surface-modified paraffin oil emulsion in a weight ratio of 100:(0.99-4.75), with the quartz sand having a mesh size of 10-1500 mesh. The preparation method involves continuously dispersing the quartz sand while simultaneously spray-mixing the surface-modified paraffin oil emulsion with the quartz sand until the surface-modified paraffin oil emulsion is completely consumed, followed by drying to obtain the hydrophobic additive. The composition of this application can be used for encapsulating sensors, exhibiting both good hydrophobicity and permeability, ensuring good insulation reliability and initial discharge voltage for the sensor.

The utility model discloses a slide block glue feeding structure of a plastic mould, which comprises a diving gate assembly and a slide block of the mould, the diving gate assembly comprises a diving port and a runner, the runner is arranged in an upper mould of the mould, the diving port is arranged in the slide block, and when the mould is closed and the slide block enters a core, the runner is arranged in the slide block. The diving opening is communicated with a cavity of the injection mold, a connecting section is arranged between the diving opening and the runner, the end, away from the cavity, of the diving opening is communicated with the end, located in the mold, of the runner through the connecting section, and the connecting section is vertically arranged; the diving opening is obliquely arranged relative to the horizontal plane, and the included angle between the diving opening and the connecting section is an obtuse angle. According to the utility model, the arrangement of cold runners is reduced, the length of the whole runner is shortened, and the forming period is shortened, so that the efficiency is improved.

The application relates to the technical field of food packaging materials, and discloses an antibacterial taro silk cake food packaging bag and a preparation method thereof. The antibacterial taro silk cake food packaging bag comprises an inner laminating layer and an outer functional layer. The preparation method of the antibacterial taro silk cake food packaging bag is as follows: prepared inner laminating layer material and outer functional layer material are respectively added into two hoppers of a two-layer co-extrusion blow molding machine, the extrusion temperature of the inner laminating layer is set to 160-180 DEG C, the extrusion temperature of the outer functional layer is set to 180-200 DEG C, the composite film is obtained by blow molding after head compounding, the composite film is cut into the required size, and then heat sealing is carried out under the conditions that the heat sealing temperature is 140-150 DEG C and the heat sealing time is 2-3 seconds to obtain the antibacterial taro silk cake food packaging bag. The antibacterial taro silk cake food packaging bag has good mechanical, barrier and antibacterial properties.

This invention discloses a method for preparing in-plane test specimens of composite materials and its product. The method includes providing a composite prepreg and laying it at a preset lamination angle to form multiple laminated modules; vacuuming each laminated module and then ironing its surface with an electric iron; stacking at least two ironed laminated modules and vacuuming them again to obtain a laminated structure; hot-pressing and curing the laminated structure to form a composite material layer, forming an integral plate; fixing the integral plate to a first PVC pad with a first pressure-sensitive double-sided adhesive to form a cut sample; fixing a second PVC pad to a cutting equipment worktable with a second pressure-sensitive double-sided adhesive; and using a grinding wheel disc cutter to cut and grind the fixed cut sample in an integrated manner to obtain a test specimen, effectively overcoming the drawbacks of traditional integral vacuuming.

The application relates to the technical field of metal additive manufacturing, in particular to an SLM additive manufacturing method and system based on ultrafast laser in-situ assistance and application, which comprises the following steps: a three-dimensional model of a part to be formed is established and slice processing is carried out to generate a scanning path of a main laser; an ultrafast laser is coaxially combined with the main laser, and working parameters of the main laser and the ultrafast laser are set; a layer of metal powder is laid in a forming area, the main laser scans and melts the metal powder according to the scanning path to form a molten pool, and the ultrafast laser acts on the tail of the molten pool or the solidification front of the point after the main laser scans the point at a preset time interval; layer-by-layer processing is carried out until the whole part is manufactured. The ultrafast laser is coaxially integrated with the main laser, and in a preset time interval after the main laser scans a point to melt the metal powder and form a molten pool, the ultrafast laser is used to impact and inject energy into the tail of the molten pool or the solidification front which is advancing, so that grain refinement, defect elimination and stress regulation can be realized, and high-performance metal parts with small and uniform microstructure, few internal defects, low residual stress, excellent mechanical properties and significantly improved isotropy can be prepared.

This invention discloses a preparation process for a high-density tungsten-cobalt cemented carbide, relating to the field of cemented carbide preparation technology. The process includes the following steps: S1: Batching: Tungsten carbide powder, cobalt powder, and a forming agent are precisely weighed according to a preset mass percentage and placed in a high-efficiency mixing device for pre-mixing to ensure that the components are initially and uniformly dispersed, resulting in a stable tungsten-cobalt mixture. This invention employs a multi-stage densification process involving wet ball milling, spray drying, die pressing, and cold isostatic pressing. This not only ensures that the mixture particles are sufficiently refined and uniformly dispersed, producing spherical composite powder with excellent flowability and significantly reducing internal defects in the formed blank, but also further enhances the density and uniformity of the blank through cold isostatic pressing, providing a good foundation for subsequent full densification during sintering, effectively reducing the porosity of the finished alloy and improving the overall structural stability.

This invention provides a copper-phosphorus alloy target and its preparation method. The preparation method includes the following steps: sequentially subjecting a copper-phosphorus alloy billet to hot forging, forging and stretching, a first water cooling treatment, a first heat treatment, rolling, a second heat treatment, and a second water cooling treatment to obtain the copper-phosphorus alloy target; the phosphorus content in the copper-phosphorus alloy billet is 400-500 ppm. The preparation method provided by this invention can reduce internal defects in the copper-phosphorus alloy target, avoid abnormal grain structure, refine internal grains, improve grain uniformity, and thus improve the quality and performance of the copper-phosphorus alloy target.

The application discloses a preparation method of high-hardness and high-wear-resistance magnesium-based composite material, which comprises the following steps: preparing materials, remelting, casting, and extruding; AZ91 alloy semi-solid-state temperature is added with B4C for stirring and cooling to form a casting rod for standby; an AZ91 alloy solution is prepared; a mold with a proper diameter is selected, the standby casting rod is placed at a center position of the mold, the AZ91 alloy solution is poured into the mold, meanwhile, the mold is placed on a vibration platform to continuously vibrate until the solution completely solidifies, so that the magnesium-based composite material is formed; and the magnesium-based composite material after complete solidification is subjected to heat treatment and cooling, and then is heated again to be extruded and deformed. The application effectively solves the extrusion difficulty of the existing composite material, greatly improves the hardness of the alloy layer, significantly reduces internal defects, improves the material density, uniformly disperses B4C particles in the matrix, avoids local agglomeration, improves the hardness and wear resistance of the composite material, and effectively reduces the cracking risk in the extrusion process.

The invention relates to a two-dimensional metal material for an ultraviolet photoelectric detector and a preparation method of the two-dimensional metal material, and belongs to the technical field of detector preparation, a sapphire substrate is activated through high-activity particles through plasma treatment, hydroxyl active sites are introduced, a clean interface foundation is laid for heteroepitaxial growth of an ultra-wide forbidden band Ga2O3 film, and the performance of the detector is improved. The method comprises the following steps: performing chemical vapor deposition on Ga2O3 to ensure the specific absorption capacity of Ga2O3 to ultraviolet light, annealing in a mixed atmosphere after chemical vapor deposition, repairing the oxygen vacancy defect of a Ga2O3 film by using the high activity of ozone, improving the crystallization quality, effectively reducing dark current noise, and performing in-situ growth of a WSe2 layer in a high vacuum environment through a pulse laser deposition technology to form a van der Waals heterojunction without lattice mismatch. And an efficient carrier separation channel can be constructed by virtue of energy level matching of WSe2 and Ga2O3, so that the problem that ultraviolet absorption and carrier transmission are difficult to consider by virtue of a single material is solved, and the light response capability of the device is remarkably enhanced.

This application discloses a method for 3D printing aluminum alloy bearing cages, belonging to the field of cage production technology. The method includes the following steps: (1) preparing a matrix powder; (2) pretreating untreated SiC nanoparticles with nickel-phosphorus plating to obtain SiC nanoparticles coated with an average layer thickness of 60-100 nm nickel-phosphorus layer, mixing them evenly with the obtained matrix powder to obtain a powder, and then using laser powder bed 3D printing to perform layer-by-layer printing to obtain a preliminary blank; (3) heat-treating the preliminary blank to obtain the aluminum alloy cage. The aluminum alloy bearing cage prepared by adding SiC nanoparticles and using laser powder bed 3D printing has high hardness and good wear resistance, which not only extends the service life of the cage but also enables rapid short-term production of the cage.

The invention discloses portland cement clinker based on marlstone and a preparation method thereof, and relates to the technical field of cement. The method comprises the following steps: crushing, grinding and drying natural marlstone, spraying and activating by using a mixed steeping liquor containing sodium hydroxide, lanthanum nitrate and cerous nitrate, and drying and roasting at low temperature to obtain modified marlstone powder; mixing the powder with calcium carbonate, quartz powder, ferric oxide, dihydrate gypsum, calcium fluoride and barium carbonate, and pressing into a green body; and finally, sequentially carrying out two-stage mineralization calcination on the green body, introducing oxygen-enriched air in a heat preservation stage, continuously calcining, and cooling to obtain the cement clinker. According to the invention, marlstone is used as a main raw material, and the obtained cement clinker has excellent sulfate corrosion resistance through dipping activation and multi-stage calcination processes.

The invention relates to the technical field of concrete vibration, in particular to an end-side-cloud system for monitoring and controlling the concrete vibration quality of nuclear power engineering, which comprises a vibration terminal device for performing multi-modal data acquisition and end-side early warning in the vibration process and executing concrete vibration operation; the edge computing terminal is used for performing real-time processing, vibration energy distribution analysis and concrete compactness intelligent evaluation on the multi-modal data uploaded by the vibration terminal device, and generating a control suggestion for the vibration process; the cloud platform is used for carrying out centralized storage and modeling analysis on data from the edge computing terminal and the vibrating terminal device; and the communication module is used for realizing two-way communication of data and control instructions among the vibrating terminal device, the edge computing terminal and the cloud platform. According to the invention, the detection and control of the vibrating process are realized, and the vibrating quality is improved.

The application relates to the technical field of seamless steel pipe manufacturing, and discloses a seamless steel pipe skew rolling equipment and a process, wherein the seamless steel pipe skew rolling equipment comprises a base and a PLC controller; a skew rolling mechanism, the skew rolling mechanism comprises a driving disc and an annular frame which are respectively fixed on the upper surface of the base, the inner wall of the annular frame is provided with six support frames in a circumferential array, the inner wall of each of the six support frames is rotationally provided with a roller, and the skew rolling mechanism further comprises a driving motor which is arranged on the side of the driving disc and used for driving the six rollers to rotate simultaneously. Through the arrangement of the skew rolling mechanism, the steel billet for manufacturing seamless steel pipes can be processed in a way that the six rollers are used for oblique rolling, the production efficiency of the seamless steel pipes is effectively improved, the energy consumption is reduced, the occurrence of internal defects is reduced, the quality and stability of the products are improved, the production equipment is simplified, and the maintenance cost is reduced.

This invention relates to the field of architectural ceramics, disclosing a glaze with a uniform crackle effect, a glaze preparation process, a ceramic tile, and the same preparation process. The glaze comprises a base glaze and a gradient expansion agent, with the base glaze comprising 68-88 parts by mass and the gradient expansion agent comprising 8-20 parts by mass. The base glaze comprises, by mass percentage, 45%-49% kaolin, 22%-25% quartz, 10-15% albite, and 14%-18% calcium carbonate; the gradient expansion agent comprises, by mass percentage, 25%-35% nano-zirconium oxide, 25%-35% borosilicate glass, and 40%-50% nepheline. The glaze is applied to a ceramic body, dried, and sintered to obtain a ceramic tile with a uniform crackle effect. The crackle-effect glaze and ceramic tile prepared by this invention effectively overcome the defects of uneven crack distribution in traditional processes; the density, width, and depth of the cracks exhibit uniformity and stability, thereby further enhancing the overall aesthetics of the crackle glaze.

The application provides a device and method for vacuum-assisted pultrusion of thermoplastic composite rods, and belongs to the field of civil engineering. The device solves the problem of bubbles generated by melt flow of thermoplastic resin, which reduces the forming quality of the thermoplastic composite rod. The device comprises a preheating module for preheating a thermoplastic prepreg tape, a heating module, a cooling module and a vacuum pumping device. The heating module comprises a first heating cavity, a vacuum cavity and a second heating cavity connected in sequence. The vacuum cavity is connected with the vacuum pumping device through a vacuum pumping port. The vacuum cavity adopts a gradient vacuum pumping design. Second heating components are arranged in the first heating cavity, the vacuum cavity and the second heating cavity. The cooling module is connected with the second heating cavity and used for cooling a thermoplastic composite rod product. Conical constraint components are arranged in the first heating cavity, the second heating cavity and the cooling module. The conical constraint components are used for narrowing the transmission path of the thermoplastic prepreg tape in the corresponding module. The device is mainly used for forming the thermoplastic composite rod.

The utility model discloses a high -speed copper cable integration injection moulding frock, include: for fixed installation high -speed copper cable each group wire core's injection assembly still include: for the fixed clamping assembly of high -speed copper cable's each group wire core starting end, the injection assembly includes: the movable connection injection upper cover, injection lower cover, the contact surface of injection lower cover, injection upper cover, respectively be provided with the multiple groups of guide groove group that the each group wire core of high -speed copper cable is defined to, and each guide groove group is comb -tooth shape in space, wherein, injection upper cover is provided with multiple injection port I that communicates with outside injection molding machine, and the middle part of each guide groove group is provided with injection recess in the perpendicular cable direction, and each injection port I and corresponding injection recess are in space intercommunication state. The utility model discloses utilize the comb -tooth guide groove group to ensure that each group wire core spacing is even, and the injection recess that sets up in each guide groove group reduces the overflow risk in the injection process.

The application discloses a manufacturing method of aileron bonding parts in the technical field of aerial unmanned planes, and comprises the following steps: S1, preparing laminated plate parts and edge strip parts; S2, pretreating a bonding tool; S3, pretreating bonding surfaces of the laminated plate parts and the edge strip parts; S4, preparing a honeycomb core and a foam core, laying a rubber film or foaming rubber on a preset bonding surface, positioning a lower skin on the bonding tool, and sequentially assembling a preformed framework to be subjected to pre-foaming treatment. By adopting a carbon fiber composite laminated structure, a composite layout of a foam sandwich and a honeycomb sandwich, and an integrated structure design of a single beam and multiple ribs, the application greatly reduces the number of independent parts and standard parts, significantly reduces the overall weight of the aileron bonding parts, effectively improves the flight maneuvering flexibility and endurance of the unmanned plane, and simultaneously reduces flight energy consumption and manufacturing cost.

The invention discloses a high-strength flame-retardant phenolic aldehyde fireproof thermal insulation integrated board and a preparation method thereof, and belongs to the technical field of building materials. Phenolic resin, modified expanded vermiculite, polyphenyl particles, graphite polyphenyl particles, perlite particles and hexamethylenetetramine are mixed and stirred to obtain a mixture, and the mixture is subjected to hot press molding to obtain a structural layer phenolic board; taking a phenolic aldehyde insulation board as a middle layer, sequentially laying non-woven fabric on the surface of one side of the core material, smearing bonding mortar, attaching a structural layer phenolic aldehyde board, laying alkali-resistant glass fiber mesh cloth, smearing anti-crack mortar, and standing for 15 minutes; laying a non-woven fabric on the other side of the core material according to the same process, coating the non-woven fabric with adhesive mortar, attaching a second structural layer phenolic aldehyde plate, laying an alkali-resistant fiberglass mesh, and coating anti-crack mortar to obtain a prefabricated integrated plate; and standing and curing the prefabricated integrated plate to obtain the integrated plate. The obtained integrated plate has good mechanical property, flame retardant effect and heat preservation performance, and meets the requirement for integration of fire prevention and heat preservation of buildings.

This invention discloses a 635MPa grade niobium-vanadium-chromium composite reinforced high-performance steel bar and its smelting method. By controlling the chemical composition and V / N mass ratio of the steel bar within the range of 3.35 to 3.75, and employing a multi-element composite strengthening formula of niobium, vanadium, and chromium to replace the traditional single vanadium-nitrogen alloy addition mode, production costs are reduced. During the smelting process, a dedicated dry powder stirring device is used to pre-mix the microalloying reinforcing agent, achieving uniform mixing of powder components and removal of magnetic impurities. Simultaneously, a composite desulfurizing agent is introduced and a step-by-step addition process is adopted, combined with a gradient ladle bottom-blowing argon stirring system, to effectively reduce the sulfur content in the steel. The steel bar prepared by this invention has a uniform microstructure, high grain size, and excellent mechanical properties such as tensile strength, yield strength, strength-to-yield ratio, and elongation. It exhibits good product consistency, low production costs, and can stably mass-produce high-performance 635MPa grade high-strength earthquake-resistant steel bars.

The utility model discloses a high-reflection powder coating producing and processing device, which relates to the technical field of powder coatings and comprises a mounting frame, and a plurality of cooling roller groups which are sequentially arranged at intervals and are used for cooling, tabletting and conveying continuously conveyed molten materials step by step are arranged in the mounting frame. The rear part of each cooling roller group is provided with a separating mechanism which is used for separating the cooling pressed sheets adhered to the roller surfaces of the cooling roller groups and horizontally guiding the cooling pressed sheets, and the rear part of the middle cooling roller group is provided with a slitting mechanism which is used for slitting the cooling pressed sheets; according to the utility model, not only can the internal defects of the material be effectively reduced by cooling and tabletting the molten material step by step, but also the material can be efficiently and stably cut and conveyed in the cooling and tabletting process, so that the cooling and tabletting efficiency and quality of the molten material are greatly improved.

This invention belongs to the field of thermal barrier coating technology, and particularly relates to a method for preparing an MCrAlY coating. The method first uses a powder metallurgy HY3 target and employs multi-arc ion plating technology to prepare an MCrAlY coating on the surface of a high-temperature alloy. The coating is then subjected to vacuum heat treatment, shot peening, and surface conversion layer treatment. The MCrAlY coating prepared by this method has a uniform microstructure, few internal pores and other defects, and a dense surface conversion layer that forms a diffusion barrier layer. This layer resists oxidation and prevents diffusion between the MCrAlY coating and the Pt layer, enabling the study of MCrAlY underlayers with low infrared emissivity and long-term stability.

The application discloses a casting method of a cast-state QT700-3 gear hub, and comprises the following steps: step one, determining the placing state of the gear hub in the sand mold as a placing mode with a small opening downward and a large opening upward; step two, determining that one gear hub is placed in the sand mold of each sand box; step three, determining a riser structure, the riser is designed to be integrated with the gear hub, the cross section of the riser extends along the large opening direction of the gear hub, and the cross section is Y-shaped; step four, determining that the parting mode of the gear hub during casting is horizontal parting along the top of the riser of the gear hub, and the sand mold is divided into two parts; and step five, determining a gating system structure, the sprue gate and the runner are located on the upper sand mold, and the position, at which the top of the sprue gate is connected with the outside of the mold, is a funnel-shaped top structure of the sprue gate. The casting method of the cast-state QT700-3 gear hub can reduce casting defects such as inclusions, pores and loose in the gear hub during the casting process, improves the internal quality of the gear hub, and meets the performance requirements of the QT700-3 material in the cast state.

The application discloses a conductive wire core aluminum alloy and a manufacturing method and application thereof, relates to the technical field of conductive wire core materials, and comprises the following components by percentage of weight: A 0.003-1.465 wt%, rare earth elements 0.001-7.670 wt%, aluminum 88.005-99.999 wt% and inevitable impurities; the conductive wire core aluminum alloy and the manufacturing method and application thereof precisely control the proportion of iron, copper and magnesium alloy elements, especially control the total content of iron and the mass ratio of copper and magnesium, and combine the grain refining effect of rare earth elements, so that the alloy has high strength and high conductivity, solves the problem that the strength and conductivity of a traditional alloy are restricted by each other, and is suitable for large-scale production.

The utility model provides a quartz tube tail supporting cover welding device which comprises a base, a first clamping mechanism, a second clamping mechanism, an inner side welding mechanism and an outer side welding mechanism, a sliding rail is arranged on the base, and the second clamping mechanism is movably arranged on the sliding rail. The second clamping mechanism is internally provided with an installation channel, the inner side welding mechanism comprises a first support and an inner ring lamp, the first support is arranged in the installation channel in a penetrating mode, and the inner ring lamp is arranged on the first support. The outer side welding mechanism comprises a bottom frame, a second support and an outer ring lamp, and the outer ring lamp and the inner ring lamp are coaxially arranged. The inner ring lamp heats the inner contact surface of the quartz tube and the supporting cover, and the outer ring lamp heats the outer contact surface of the quartz tube and the supporting cover, so that uniform heating in the wall thickness direction of the quartz tube and synchronous internal and external melting are ensured, deep welding is realized, the welding strength, the sealing property and the welding seam uniformity are remarkably improved, and bubbles and internal defects are reduced; and meanwhile, the welding efficiency and the automation degree can be improved.