318 results about "Semi solid" patented technology

The invention belongs to the technical field of material processing, and discloses a magnesium alloy casting semi-solid injection molding method and application, and the method comprises the following steps: checking and adjusting a semi-solid injection machine, a casting mold and other equipment to be in a normal state, and placing magnesium alloy particles in a designated area of a hopper; putting a long nozzle of the semi-solid injection platform into the center of a mold sprue; setting the temperature of each section of a mold temperature controller, a charging barrel and a nozzle; preserving heat for a period of time after the temperature of the charging barrel reaches a set value, so that the temperature of materials in the charging barrel is uniform; setting the injection rate, the cooling time, the material return distance and the melt pressure of the semi-solid injection machine; and after a release agent is quantitatively sprayed to the mold, a semi-solid injection program is started, and a casting is obtained. The AS41B magnesium alloy particles with good heat resistance are adopted as the raw material, the semi-solid injection molding method is combined, a melting furnace is not needed, only heating to the semi-solid state is needed, the melt temperature is low, energy is saved, the service life of a mold is prolonged, protective gas is not needed, and the manufactured casting is good in mechanical property and high in heat resistance.

The invention provides a magnesium-lithium alloy and a semi-solid thixotropic die-casting preparation method of the magnesium-lithium alloy. The magnesium-lithium alloy comprises the following components in percentage by mass: 5-14% of Li, 2-9% of Al, 1-3% of Zn, 1-5% of Ca, 0.3-3% of RE and the balance of Mg. The semi-solid thixotropic die-casting preparation method of the magnesium-lithium alloy comprises the steps that S1, burdening and drying are conducted according to the preset mass percent, vacuum melting is conducted in the protective gas atmosphere, and molten metal is obtained and cast into a magnesium-lithium alloy cast ingot; performing extrusion deformation on the magnesium-lithium alloy ingot, and cutting to prepare millimeter-scale long rod-shaped magnesium-lithium alloy particles; s2, the magnesium-lithium alloy particles obtained in the S1 are heated to the solidus temperature Ts or above, electromagnetic stirring is conducted, and semi-solid slurry is prepared; and S3, the semi-solid slurry is injected into a die-casting die, a die cavity is filled with the slurry by applying pressure, die opening and part taking are conducted after pressure maintaining, and the ultra-light high-strength semi-solid thixotropic die-casting magnesium-lithium alloy casting is obtained.

The invention discloses a semi-solid thixotropic injection casting method for forming a ribbed thin-wall magnesium alloy new energy automobile shell part, and relates to a semi-solid thixotropic injection casting method for forming magnesium alloy. The invention aims to solve the technical problem that the existing semi-solid thixotropic injection-cast AZ91D magnesium alloy is difficult to meet higher requirements of components on comprehensive mechanical properties. According to the feeding barrel in the semi-solid thixotropic injection casting forming machine, five sections of variable-pitch screw rods are divided into five sections along the axis from the feeding direction to the discharging direction, and the screw pitches of the five sections are sequentially reduced; the invention further provides a T6 heat treatment method for semi-solid thixotropic injection casting of the AZ91D magnesium alloy, the solid solution time in T6 heat treatment is shortened by a long time compared with other alloys, the cost is saved, and the production efficiency is improved; and the combination of parameters such as slurry temperature, mold temperature, injection casting speed and injection casting pressure is optimized to synergistically realize grain refinement, second phase dispersion precipitation and tissue density improvement, so that the mechanical property is remarkably enhanced.

The invention discloses a high-toughness corrosion-resistant semi-solid injection molding magnesium alloy and a preparation method thereof, and belongs to the technical field of metal materials. The magnesium alloy comprises the following chemical components in percentage by weight: 8.6 to 11 percent of aluminum, 0.5 to 1 percent of zinc, 0.05 to 0.4 percent of manganese, 0.05 to 0.2 percent of calcium, 0.6 to 2 percent of rare earth element RE and the balance of magnesium and inevitable impurities. The preparation method of the alloy comprises the following steps: (1) adding raw materials according to the component proportion, smelting into magnesium alloy melt, pouring into a mold, and molding to obtain a magnesium alloy ingot; (2) cutting the cast ingot into magnesium alloy semi-solid blank particles; (3) performing injection molding to obtain a molded part; (4) solid solution heat treatment; and (5) performing two-stage aging heat treatment. The magnesium alloy has high toughness and corrosion resistance, and is suitable for semi-solid injection molding. The forming process can achieve near-net forming of complex components, and castings are few in defect, compact in structure and wide in application prospect.

The invention discloses a thixotropic injection casting forming and heat treatment combined strengthening method for a complex ultrathin lightweight magnesium alloy material, and relates to a forming and heat treatment combined method for a magnesium alloy material. The invention aims to solve the technical problem that the mechanical property of the existing complex ultrathin light-weight magnesium alloy material is poor. According to the method, AZ91D magnesium alloy particles serve as raw materials, the density is improved through semi-solid thixotropic injection casting parameter regulation and heat treatment strengthening, defects are strictly controlled, the technology of low-temperature short-time solid solution + room-temperature water cooling + short-time aging + air cooling is adopted, and the tensile strength, the yield strength and the ductility after the heat treatment technology are obviously improved; the heat treatment process is an important guiding direction for thixotropic injection casting heat dissipation pieces, supporting pieces and structural pieces in the future. The thixotropic injection casting technology and the special heat treatment technology are excellent combinations for forming the complex ultrathin lightweight magnesium alloy shell, the combination can further improve the mechanical property of a structural part, and the application potential of the alloy is broken through.

The invention discloses a high-thermal-conductivity Mg-Zn magnesium alloy suitable for rheoforming and a preparation and processing method of the high-thermal-conductivity Mg-Zn magnesium alloy. The alloy comprises the following components in percentage by weight: 1-8% of Zn, 0.5-5% of Cu, 0.2-2% of Sn, 0.2-1% of Sc and the balance of Mg and inevitable impurities. The preparation and processing method comprises the following steps: (1) preparing raw materials according to the composition of the alloy components, and smelting by adopting a medium-frequency induction furnace and taking mixed gas of tetrafluoroethane and argon as a protective atmosphere; (2) mechanical stirring and ultrasonic synergistic stirring are combined to form a uniform melt; (3) preparing semi-solid slurry with a solid phase ratio of 35-50%; (4) forming; (5) cooling and opening the mold; (6) the obtained rheoforming blank is heated to 340-430 DEG C, heat preservation is conducted for 2-12 h, and after heat preservation is finished, quenching is conducted immediately, and cooling is conducted to the room temperature; (7) pre-aging; and (8) aging. By reasonably designing alloy components and optimizing rheoforming parameters, the defects of shrinkage, hot cracking and segregation of a conventional cast Mg-Zn alloy are overcome, and meanwhile, high heat conductivity and mechanical properties are guaranteed.

The invention relates to a cast-rolling casting nozzle with an electric-magnetic coupling oscillation effect. Relates to a cast-rolling casting nozzle with an electromagnetic oscillation effect, which is matched with a horizontal double-roller cast-rolling machine in the field of aluminum alloy die casting. The method is used for solving the inevitable internal macrosegregation defect of the high-alloy-content aluminum alloy cast-rolled product. The device comprises an L-shaped electrode pair 1; a side seal 2; an excitation device 3; a guide plate 4; a cooling water pipe (inlet / outlet) 5; a copper enameled wire (excitation) 6; a countersunk self-tapping screw 7; a casting nozzle upper plate 8; a rhombic shunting block 9; a nozzle lower plate 10; and a casting nozzle bottom plate 11. In the casting and rolling process, an oscillating electric field and a steady magnetic field are introduced, electromagnetic coupling force is generated at the outlet end of a casting nozzle, the electromagnetic force effectively stirs a semi-solid aluminum alloy melt, and therefore the purposes that alloy is evenly distributed, and segregation defects are reduced or even eliminated are achieved. The method is used in 4-series, 6-series and 7-series aluminum alloys, and the effect is obvious.

The invention discloses a dispersion distribution method for a micro-nano multi-scale mixed SiC particle reinforced phase in an aluminum-based composite material and the composite material, and relates to the technical field of metal-based composite material preparation. The method comprises the following steps: firstly, carrying out ultrasonic cleaning, ultrasonication and two-stage high-temperature oxidation treatment on SiC particles, and generating an oxidation film on the surfaces of the particles; ball-milling and mixing the treated micron and nano SiC particles and micron pure magnesium particles according to a specific proportion, and pressing into a precast block; then preparing an aluminum alloy melt, cooling to a solid-liquid two-phase region, carrying out semi-solid stirring, and adding the preheated precast block; and finally, raising the temperature to be above a liquidus, rewarming, stirring and molding by casting. Through the synergistic effect of ultrasonic physical dispersion, high-temperature oxidation surface modification and magnesium-induced semi-solid stirring, the problems that micro-nano particles are prone to agglomeration, wettability is poor and interface reaction is difficult to control are effectively solved, multi-scale uniform dispersion distribution of a reinforced phase in an aluminum matrix is achieved, and the comprehensive performance of the composite material is remarkably improved.

The invention relates to the technical field of aluminum alloys, in particular to a semi-solid aluminum alloy suitable for friction stir welding and a preparation method and a machining method of the semi-solid aluminum alloy. The semi-solid aluminum alloy suitable for friction stir welding comprises, by weight, 6.5%-8.0% of Si, 1.0%-1.5% of Cu, 0.2%-0.8% of Mg, 0.01%-0.05% of Sr, 0.01%-0.1% of RE and the balance Al and inevitable impurities, and the total content of the inevitable impurities is smaller than or equal to 0.2%. The semi-solid aluminum alloy can be formed through a semi-solid rheo-die-casting process and can be welded through a friction stir welding process, the mechanical property of the semi-solid aluminum alloy is excellent, and the mechanical property of a welded joint obtained through welding is excellent.

The invention relates to the technical field of magnesium alloys, in particular to a low-density, high-modulus and ultrahigh-strength magnesium-based composite material and a preparation method thereof.The preparation method comprises the steps that SiC reinforcement particles are pretreated; the raw materials are proportioned according to the mass percent of the components of the magnesium alloy; melting pure magnesium, sequentially adding alloy elements, uniformly stirring, cooling to a semi-solid temperature interval, adding the pretreated SiC reinforcement particles, and casting in a preheating mold to solidify, so as to obtain a magnesium-based composite material cast ingot; the cast ingot is sequentially subjected to solution treatment and extrusion forming; carrying out secondary solution treatment on the magnesium-based composite material bar subjected to extrusion forming; and performing rotary swaging deformation and intermediate annealing treatment on the magnesium-based composite material bar subjected to secondary solution treatment to obtain the ultrahigh-strength magnesium-based composite material. Therefore, the problems that in the prior art, magnesium alloy is insufficient in strength and modulus, a magnesium-based composite material easily generates casting defects and is difficult to deform at room temperature, and the performance of the material is weakened due to grain growth during high-temperature deformation are solved.

The invention discloses a method for preparing a magnesium-based composite material based on semi-solid injection molding and a product and application of the magnesium-based composite material, and belongs to the technical field of magnesium-based composite material preparation.The method comprises the following steps that a semi-solid injection molding method is adopted, a mixture of magnesium alloy matrix particles (millimeter-level) and high-entropy alloy powder is sequentially heated and stirred, and the magnesium alloy matrix particles (millimeter-level) and the high-entropy alloy powder are obtained; performing injection molding and cooling to obtain a sample; and the sample is annealed, and the magnesium-based composite material is prepared. Wherein the magnesium alloy matrix particles comprise the following components in percentage by mass: 1-9% of aluminum, 1-7% of zinc and the balance of magnesium and inevitable impurities (impurity elements are less than or equal to 0.1%); the high-entropy alloy powder is particles containing Al, Co, Cr, Fe and Ni elements, and the particle size is 0.5-50 microns. Magnesium alloy matrix particles and AlCoCrFeNi particles are mixed, and then a semi-solid injection molding technology is combined, so that the sedimentation problem of a high-density reinforced phase can be eliminated, the reinforced phase is uniformly dispersed in the material, and the comprehensive mechanical property of the composite material is further improved.

The invention discloses a semi-solid die-casting high-strength and high-conductivity aluminum alloy and a die-casting method thereof, and relates to the technical field of semi-solid die-casting aluminum alloys, and the aluminum alloy comprises the following components in parts by weight: 3.86 to 4.32 percent of silicon, 0.24 to 0.32 percent of magnesium, 0.35 to 0.45 percent of copper, 0.42 to 0.56 percent of manganese, 0.26 to 0.38 percent of iron, 0.07 to 0.09 percent of zinc, 0.30 to 0.40 percent of molybdenum, 0.18 to 0.22 percent of strontium, 0.05 to 010 percent of yttrium, 0.03 to 0.05 percent of scandium and the balance of aluminum. The die casting method of the aluminum alloy comprises the steps of raw material smelting, degassing, stirring vibration, die casting, heat treatment and the like. The problems that an existing aluminum alloy is poor in casting fluidity, and a semi-solid die-casting aluminum alloy with high strength and high thermal conductivity cannot be obtained are solved, the tensile strength of the semi-solid die-casting aluminum alloy obtained through the formula and the technology is not lower than 314 MPa, the yield strength is not lower than 263 MPa, the thermal conductivity is not lower than 182 W / (m.K), and the service life of the semi-solid die-casting aluminum alloy is prolonged. And the requirements and application of high-strength and high-thermal-conductivity aluminum alloy parts required in the fields of communication, automobiles, electronic appliances and the like are met.

The utility model discloses a kind of magnesium alloy semi-solid die-casting forming equipment, including slurry supply device, die-casting device and the forming die with forming cavity, slurry is supplied to pressure equipment after being supplied by slurry supply device, and the required magnesium alloy product is formed by being pressed into forming cavity by die-casting device, feature is that slurry supply device includes slurry preparation mechanism and ration supply mechanism, slurry preparation mechanism is sealingly connected by ration supply mechanism between die-casting device, slurry preparation mechanism is used to prepare magnesium alloy slurry of semi-solid from solid raw material, and the magnesium alloy slurry of semi-solid prepared by slurry preparation mechanism is ration supplied to die-casting device by ration supply mechanism. Advantage is simple structure, and it is convenient to obtain the magnesium alloy product with more excellent mechanical property.

The application belongs to the technical field of metal materials, and particularly relates to a kind of multi-element micro-alloyed Al-Zn series magnesium alloy for semi-solid injection and a preparation method thereof, which comprises the following steps: raw materials and pretreatment; vacuum induction melting and purification are carried out on the raw materials to obtain a melt containing multi-element micro-alloyed Al-Zn series; the melt is rapidly solidified and powdered to obtain petal-shaped magnesium alloy granules; the magnesium alloy granules are subjected to semi-solid injection molding to obtain a magnesium alloy molded part; the magnesium alloy molded part is subjected to special gradient heat treatment to obtain a magnesium alloy heat-treated part; and finishing treatment is carried out on the surface of the magnesium alloy heat-treated part. In addition, the application also prepares a multi-element micro-alloyed Al-Zn series magnesium alloy by using the above preparation method. The application realizes the synergistic improvement of strength-plasticity-corrosion resistance by constructing a unique grain boundary dispersed micro-tube core-shell structure and combining semi-solid injection molding and special heat treatment process.

This invention relates to the field of metal die casting technology, and more specifically, to an ultrasonic-assisted vacuum die casting apparatus and method for non-ferrous metals. The apparatus includes a forming mold, a casting system, a vacuum system, and a vibration demolding system. The forming mold has a cavity. The casting system is connected to the forming mold and is used to inject liquid metal into the cavity. The vacuum system is connected to the forming mold and is used to evacuate the cavity. The vibration demolding system is connected to the forming mold and is used for ultrasonic vibration and demolding. Evacuating the cavity allows the molten metal to fill it more easily, reducing porosity and increasing density. The vibration demolding system vibrates the semi-solid metal material cooled to a certain point within the cavity, breaking up grains and venting air, thereby producing die-cast parts with clear interfaces, high density, and high strength and quality. The vibration also automatically cuts off the small gate point of the casting and solidified material.

The invention discloses a forging forming process for an aluminum casting chassis supporting arm implanted with a steel plate framework, and relates to the technical field of metal composite material forming. The method comprises the following steps: 1, pretreating a steel plate framework; 2, assembling the mold; 3, performing semi-solid extrusion; 4, sequentially carrying out segmented heat treatment of solid solution at 535 DEG C for 2 hours, water quenching and aging at 175 DEG C for 8 hours; and 5, the cooling rate is controlled to be 5 DEG C / min under a 0.15 T rotating magnetic field, and solidification is completed. Through a quadruple synergistic mechanism of micro anchoring structure-gradient coating-semi-solid extrusion-segmented heat treatment, the shear strength of a composite interface reaches 60-105 MPa, the tensile strength of a final component reaches 311-322 MPa, the fatigue life is prolonged to 120 million times from 500 million times, the lightweight target that the weight is reduced by 50% compared with that of a pure steel part is achieved, and the production cost is reduced. The defects of insufficient strength, infirm aluminum / steel interface bonding, pore shrinkage and brittle phase of a traditional aluminum casting piece are overcome.

The invention relates to the technical field of metal material processing, and discloses a manufacturing method for continuous cast rolling of an aluminum strip for a 3104 aluminum louver, which comprises the following steps: S1, melting and refining 3104 aluminum alloy, and then stably conveying molten aluminum with the temperature maintained at 680-720 DEG C; s2, the molten aluminum is introduced into a high-frequency electromagnetic induction suspension molding area, the molten aluminum is suspended under the action of a main suspension coil, and a semi-solid strip blank with the solid outer layer and the liquid inner layer is formed; s3, the semi-solid strip blank sequentially passes through a non-contact high-energy ultrasonic energy field and an atomization cooling area; and S4, the treated semi-solid strip blank is guided into a flexible synchronous rolling roller to be rolled, and the strip with the set thickness is obtained. The semi-solid strip blank is formed by the molten aluminum in a non-contact state in an electromagnetic induction suspension mode, direct contact between the molten aluminum and a low-temperature mold is avoided, and therefore formation of strip surface defects caused by the chilling effect is restrained.

The invention discloses a magnesium alloy semi-solid forming method and system. The method comprises the steps that target physical parameter data of a magnesium alloy to be machined are obtained; extracting general physical parameter data matched with the set physical parameter data of the sample magnesium alloy from the target physical parameter data, and determining specific physical parameter data except the general physical parameter data in the target physical parameter data; universal simulation data matched with the universal physical parameter data are obtained from a simulation database, the simulation database is used for storing semi-solid forming simulation data of the magnesium alloy sample, and the semi-solid forming simulation data are obtained by conducting semi-solid forming simulation through CAE according to the set physical parameter data; cAE is used for semi-solid forming simulation based on the specific physical parameter data and the general simulation data to obtain a semi-solid forming simulation result, and the simulation result is used for optimizing the semi-solid forming process parameters of the magnesium alloy to be machined, so that the simulation operation amount can be reduced, and the simulation operation duration can be shortened.

The invention discloses a preparation method for improving the corrosion resistance of a spray-formed aluminum alloy component, and belongs to the field of preparation of high-performance metal materials. According to the method, a high-frequency alternating magnetic field with specific parameters (such as the strength of 0.2 T-0. 8T and the frequency of 5kHz-50kHz) is synchronously applied in the deposition stage of spray forming, so that the magnetic field force acts on molten drops which are being solidified and a semi-solid layer. According to the method, nucleation, growth and spatial distribution of a nano precipitated phase and a nano dispersed phase are actively intervened in situ through magnetic field induced micro-area convection and interface energy regulation and control, so that the microscopic heterogeneity which is easy to cause corrosion is fundamentally optimized; compared with a conventional spray forming process without a magnetic field, according to the method, the corrosion current density of the 7075 aluminum alloy in a 3.5% NaCl solution can be reduced by about 60%, the pitting potential positive shift exceeds 80 mV, the service life of a component in a severe environment is remarkably prolonged, and the reliability of the component in the severe environment is remarkably improved.

Method for manufacturing a component (11) wherein an aluminum-based alloy (20) is provided and converted into a semi-solid state and the component (11) is manufactured from it by a semi-solid process, characterized in that the alloy (20) contains less than 1.3 wt.% iron and at most 0.2 wt.% silicon.

The application belongs to the field of magnesium alloy semi-solid injection molding, and specifically discloses a high-quality and high-efficiency magnesium alloy wheel hub semi-solid injection molding method. The method is implemented by using a semi-solid forming device with a material dispersion chamber, a grain spheroidization chamber, an injection chamber, a double-screw stirring shaft and a plunger pusher. The method comprises the following steps: adding raw material particles into the material dispersion chamber; controlling the temperature and the rotating speed of the stirring shaft in the material dispersion chamber, so that the raw material particles form premixed slurry in the material dispersion chamber; controlling the temperature and the rotating speed of the stirring shaft in the grain spheroidization chamber, so as to promote the spheroidization of the grains in the premixed slurry and form semi-solid composite slurry; opening the one-way valve on the plunger pusher, and transferring the slurry into the injection chamber; closing the one-way valve and controlling the stirring shaft to push the plunger pusher to move, so as to inject the slurry into the mold cavity. The application can solve the problems of high purity and mechanical property requirements and low production efficiency in the current wheel hub forming process.

The invention discloses a semi-solid die-casting method for a thin-wall aluminum-magnesium alloy for an automobile, and relates to the technical field of semi-solid die-casting, and the method comprises the following steps: S1, adding the prepared aluminum-magnesium alloy into a heat preservation cylinder, starting a rotating motor to stir and shear the aluminum-magnesium alloy, meanwhile, cooperating with an electric heating plate, keeping the aluminum-magnesium alloy in a semi-solid temperature interval, preparing semi-solid slurry, and S2, the movable mold and the positioning mold are tightly closed through an electric control hydraulic rod, and meanwhile one end of a drainage channel is sealed. The quantitative injection die-casting mechanism is scientific and reasonable in structure and safe and convenient to use, the quantitative injection die-casting mechanism is arranged, a sealing cover plate is pushed to ascend through an electric control ejector rod, sealing of a discharging channel is relieved, and the sealing effect is good. The semi-solid aluminum magnesium alloy can conveniently flow into the quantitative injection barrel through the discharging channel and the feeding pipe, and when the liquid level in the quantitative injection barrel reaches the preset height, the liquid level pressing barrel and the supporting ejector rod are hydraulically pushed to descend and make contact with the touch switch, and the electric control ejector rod is controlled in time.

The invention discloses a rare earth magnesium alloy semi-solid recovery method, which relates to the technical field of magnesium alloy recovery, and comprises four steps of reclaimed material preparation, vacuum hot pressing, semi-solid heating and thixotropic extrusion. By adopting vacuum hot pressing and semi-solid thixotropic extrusion technologies, the problems of serious oxidation and combustion of the rare earth magnesium alloy in traditional liquid recovery are avoided, and environmental pollution and resource waste are avoided; through vacuum hot pressing, high-temperature oxidation of the recycled material in the hot pressing process is avoided while the density of the vacuum hot pressing blank is ensured; by adopting semi-solid thixotropic extrusion, liquid phase flow in the forming process is promoted, an original interface between cuttings is eliminated, new metallurgical bonding is formed again, and the interface bonding force between the cuttings is greatly improved.

This invention belongs to the field of magnesium-lithium alloy material preparation technology, specifically relating to an ultralight magnesium-lithium alloy suitable for semi-solid die casting of thin-walled parts and its preparation method. This invention proposes an economical and effective magnesium-lithium alloy suitable for the semi-solid die casting process of ultra-thin-walled parts by adjusting the alloy composition and process method. The semi-solid die casting ultralight magnesium-lithium alloy for thin-walled parts described in this invention is composed of the following components by mass percentage: Li: 4.0-7.0%, Al: 2.5-5.5%, Ca: 0-1.0%, Zn: 0-1.0%, Mn: 0-0.3%, RE: 0-1.0%, with the balance being Mg and unavoidable impurity elements; RE is one or more of Ce, Y, Nd, Sm, and Er, and the sum of the contents of all elements except magnesium is <13%. The method of this invention can realize the low-temperature semi-solid molding and manufacturing of ultra-thin wall parts of 0.3~0.8mm, with a semi-solid die casting yield of over 98%; it has good molding performance, high efficiency, good product rigidity, and excellent performance; and it is easy to realize mass industrial production.

The invention relates to the technical field of preparation of aluminum alloy forgings, in particular to a preparation method of a high-performance 6-series aluminum alloy forgings based on semi-solid pretreatment and fog cooling-oil cooling composite quenching, which comprises the following steps: step 1, smelting; step 2, cooling the melt, carrying out ultrasonic treatment to a semi-solid temperature, and standing for solidification; thirdly, the cast ingot is subjected to heat preservation treatment; fourthly, the cast ingot subjected to heat preservation treatment is subjected to hot die forging; fifthly, the forge piece is subjected to composite quenching, water mist is adopted for first-stage rapid cooling, and then oil cooling is adopted for second-stage slow cooling; and sixthly, the cooled forge piece is subjected to aging treatment. And the precipitation behavior of second-phase particles is regulated and controlled by adopting a process of fog cooling first and then oil cooling, the residual stress in the forge piece is reduced, the alloy strength is improved, and the synergistic effect of fine grain strengthening and solid solution strengthening is fully exerted.

The application relates to a processing technology for an integrated lightweight rear triangle of a vehicle frame, which comprises the following steps: step one, preparation of a rear triangle metal material of the vehicle frame and a mold, the rear triangle metal material of the vehicle frame needs to be heated to a liquid state or a semi-solid state, meanwhile, the mold is preheated, the mold cavity can integrally form the rear triangle of the vehicle frame, the rear triangle of the vehicle frame comprises a rear upper fork, a rear lower fork and a hook claw; step two, pouring, cooling and solidification; step three, pipe extraction processing of the formed piece; step four, bending of the formed piece to a triangular structure; and step five, hydraulic water expansion and numerical control processing of the formed piece. The application can integrally form the rear upper fork, the rear lower fork and the hook claw, does not need welding, improves the lightness of the product, reduces hidden troubles such as deformation and false welding caused by welding, controls the thickness of the product, reduces the weight of the product, realizes the lightness of the product, saves materials, and reduces the cost.

This invention provides an ultrasonic electromagnetic rheological composite grinding and polishing method for ultra-large aspect ratio pipes. The method is characterized by: using a composite polishing method combining ultrasound, electric field, and magnetic field to simultaneously perform ultra-precision machining on the inner and outer surfaces of the ultra-large aspect ratio slender pipe (21); forming a composite field of ultrasound and electromagnetic field on the outer surface of the slender pipe, forcing the electromagnetic composite rheological fluid in the composite field to transform from a liquid into a high-strength semi-solid chain structure, forming a flexible polishing brush head to complete the outer surface machining; forming a composite field of ultrasound and magnetic field inside the slender pipe, forcing the grinding fluid (15) and its contained abrasive particles in the composite field to rotate along the inner pipe wall under the action of the composite field, completing the inner pipe machining; the same electromagnetic composite rheological fluid is used for both the inner and outer surface machining of the slender pipe. This method achieves simultaneous machining of the inner and outer surfaces in one process, greatly reducing machining time and improving machining efficiency while meeting the pipe machining requirements.

The application discloses a kind of semi-solid aluminum alloy die-casting composite feeding device, it is related to the field of die-casting machine feeding device, including feeding device, injection chamber and push rod, the injection chamber outside is equipped with fixed shell, and fixed shell inner wall is equipped with storage cavity.The application can continuously stir semi-solid molten metal throughout the process by the cooperation of storage cavity and rotatable lifting stirring blade structure, effectively suppresses the stratification and specific gravity segregation problem of metal raw materials due to the difference in component proportion, keeps the internal composition of molten metal uniform and consistent at all times, avoids the drawbacks of traditional mechanical watch layer material taking, stabilizes the internal structure of casting, significantly improves the overall forming quality of product, the temperature control of heat supplement pipe and heat preservation layer outside storage cavity, the heat insulation shell outside feeding pipe and the high-temperature steam waste heat reuse structure of storage cavity are matched, realize the closed conveying of molten metal and whole process heat preservation, substantially reduce the heat loss in the process of material conveying and storage, reduce the heat supplement energy consumption.

The utility model discloses a semi-solid injection molding mold with a cooling mechanism, and belongs to the technical field of semi-solid injection molding molds. The mold mainly comprises an upper mold body and a lower mold body, the lower mold body comprises a bottom plate and a bottom mold body, the bottom mold body is fixedly installed on the bottom plate, a liquid inlet pipe and a liquid outlet pipe are installed on the two sides of the bottom mold body in a threaded mode respectively, a cooling cavity is formed in the bottom mold body, and a lower forming cavity for finished product forming is formed in the top face of the bottom mold body; a cooling cavity is formed in the enclosure frame, a cooling groove is formed in the enclosure frame and communicates with the cooling cavity, a first heat conduction assembly is arranged in the cooling cavity, a second heat conduction assembly is arranged in the cooling groove, and by arranging the double heat conduction assemblies and the layered cooling structure, the cooling effect is greatly improved; the defects that the cooling speed of semi-solid metal is inconsistent due to too high mold temperature or non-uniform cooling are effectively avoided, shrinkage cavities, deformation and the like are reduced, the product size precision and the forming quality are improved, meanwhile, the forming period is shortened, and the production efficiency is improved.

The application discloses a kind of metal polymer composite for 3D printing and preparation method thereof, the composite is prepared by compounding semi-solid metal alloy modified by coupling agent with polymer material.The preparation method is: modified semi-solid metal alloy, polymer material, functional additive are mixed, and are processed into shape to be prepared;Or modified semi-solid metal alloy, polymer material, functional additive are mixed, material for 3D printing, and are solidified into shape again.The composite of the application is used at temperature of 20-230 DEG C, viscosity is 1-10 5 Pa·S, resistivity is 10 ‑6 ~10 6 Ω·cm;Preparation method is simple, raw material cost is low, non-toxic, post-processing is simple, so that material is applied to 3D printing when extruding evenly, speed is controllable, warpage is low, and the prepared conductive polymer material is easy to store, small in density, stable in conductive effect, compared with traditional conductive printing material, and conductive performance is obviously improved.