A die casting method includes stirring an aluminum alloy liquid in a stirrer under an airtight vacuum condition. The stirrer includes an electromagnetic inductor and a stirring rod. The aluminum alloy liquid is simultaneously subjected to an electromagnetic stirring in a direction of a magnetic field generated by the electromagnetic inductor and a mechanical stirring under a rotation action of the stirring rod. The aluminum alloy liquid is stirred for 20-80 minutes until the aluminum alloy liquid becomes semisolid to obtain a semisolid aluminum alloy slurry. The method further includes injecting the semisolid aluminum alloy slurry into a filter die to perform die casting molding at an injection speed of 1.5-2.5 m/s, an injection specific pressure of 30-80 MPa, a pressurization pressure of 60-80 MPa, and a temperature of the filter die of 250-400° C., and maintaining pressure for 7-30 seconds to obtain the filtering cavity.
C22F 1/04 - Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
B22F 9/08 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
A slurrying device includes a slurrying tank and a rotor stirrer. The rotor stirrer includes a stirring drum, a transmission gear arranged at an end face of the stirring drum configured to face the slurrying tank, and a rotor stirring rod configured to extend from the stirring drum and into the slurrying tank to stir a slurrying liquid in the slurrying tank. The rotor stirring rod is meshed with the transmission gear and configured to revolve along a planar trajectory of the transmission gear while simultaneously rotating. The rotor stirrer further includes a driving device provided at the stirring drum and configured to drive the rotor stirring rod to rotate via the transmission gear.
B01F 27/95 - Mixers with rotary stirring devices in fixed receptaclesKneaders with stirrers rotating about a substantially vertical axis with stirrers having planetary motion, i.e. rotating about their own axis and about a sun axis
B01F 27/00 - Mixers with rotary stirring devices in fixed receptaclesKneaders
B01F 35/00 - Accessories for mixersAuxiliary operations or auxiliary devicesParts or details of general application
B22D 1/00 - Treatment of fused masses in the ladle or the supply runners before casting
B22D 17/00 - Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
B22D 17/20 - AccessoriesPressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure Details
3.
HIGH-PERFORMANCE ALUMINUM ALLOY FOR SEMI-SOLID DIE CASTING, AND PREPARATION METHOD THEREOF
Disclosed is a high-performance aluminum alloy for semi-solid die-casting, and a preparation method thereof. The aluminum alloy comprises the following components, where the content of each component by weight percentage is as follows: 6.00-13.50% of Si, 0.15-1.00% of Mg, 0.05-0.50% of Cu, 0.01-0.10% of Ti, 0.10-1.00% of Mn, 0.01-0.10% of Sr, and Fe ≤0.20%, with the sum of impurity elements being <0.15%, and the remainder being aluminum. The weight percentage ratio C1 is in the range of 0.75-1.50, where C1=Mg/Mn. In the high-performance, semi-solid aluminum alloy, for the purpose of optimizing the main alloy elements, i.e., Si, Mg, and Mn, elemental Ti is added to refine α-AL crystal grains, while elemental Sr is added to refine the metamorphic eutectic Si phase. The contents of the elements and impurities are controlled to achieve synergy therebetween, and as a result the aluminum alloy has high strength, excellent plasticity and excellent semi-solid die-casting process performance.
The present invention provides a high thermal conductivity aluminum alloy, which comprises the following components in percentage by weight: Al: 80%-90%; Si: 6.5%-8.5%; Fe: 0.2%-0.5%; Zn: 0.8%-3%; V: 0.03%-0.05%; Sr: 0.01%-1%; graphene: 0.02%-0.08%. In the high thermal conductivity aluminum alloy of the present invention, alloying elements including Si, Fe, and Zn are optimized; Sr, V, graphene, among others are added. The amount of each component is controlled so that they coordinate to ALLOW high thermal conductivity, good casting performance and excellent semi-solid die-casting property. Graphene is introduced to the high thermal conductivity aluminum alloy of the present invention to exploit the good thermal conductivity of graphene, allowing the formation of a high thermal conductivity aluminium alloy.
A stepless adjustable telescopic device includes a first support, a second support, and a folding arm connecting the first support to the second support. The folding arm includes a first quadrangular structure, a second quadrangular structure, and a power support device connected to the first quadrangular structure. A first end of the first quadrangular structure is rotatably connected to the first support. A first end of the second quadrangular structure is rotatably connected to the second support, and a second end of the second quadrangular structure is rotatably connected to a second end of the first quadrangular structure via a rotary connection structure. The power support device and the first quadrangular structure form a triangular structure, and the power support device is configured to drive the first quadrangular structure to rotate such that the first quadrangular structure drives the second quadrangular structure to rotate synchronously with the first quadrangular structure.
A47B 21/02 - Tables or desks specially adapted for use at individual computer workstations, e.g. for word processing or other manual data entryTables or desks specially adapted for typingAuxiliary devices for attachment to such tables or desks characterised by adjustable parts, e.g. universally adjustable leaves, arm rests, wrist supports or mouse platforms the parts being vertically-adjustable only
6.
CAST ALUMINUM ALLOY OF HIGH-STRENGTH HIGH-TOUGHNESS THIN-WALL STRUCTURAL MEMBER AND PREPARATION METHOD THEREFOR
The present invention relates to the technical field of aluminum alloy processing, and in particular relates to a cast aluminum alloy of a high-strength high-toughness thin-wall structural member and a preparation method therefor. The aluminum alloy comprises the following components, the content of each component being shown in percentage by weight: 86.98%-96.73% Al, 3.00%-10.00% Si, 0.10%-1.00% Mg, 0.10%-1.00% Mn, 0.01%-0.10% Sr, 0.01%-0.12% B, 0.05%-0.20% Ti, Fe≤ 0.60%; and in percentage by weight, the ratio C1＝B/Sr≥1.00. According to the high-strength high-toughness aluminum alloy in the present invention, Ti and B elements are added to refine α-Al crystal grains on the basis of optimizing the main alloy elements of Si, Mg and Mn, and Sr elements are added to refine the modified eutectic Si phase. In addition, the content of the foregoing elements and impurity elements is controlled, and the elements and the impurity elements match each another, so that the aluminum alloy has high strength, good toughness and an excellent die-casting process performance.
B22D 17/00 - Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
C22C 1/03 - Making non-ferrous alloys by melting using master alloys
C22F 1/047 - Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with magnesium as the next major constituent
A high-conductivity aluminum alloy, comprising the following components in percentage by weight: 85 to 90% of Al, 6.5 to 8.5% of Si, 0.5 to 0. 8% of Fe, 0.1-0.5% of Zn, 0.01-0.015% of V, and 0.012-0.03% of Sr. According to the high-conductivity aluminum alloy, alloying elements such as Si, Fe, and Zn are optimized, elements such as Sr and V are added, the content of each component is controlled, and the components coordinate with each other. The aluminum alloy has high conductivity, good casting performance, and excellent semi-solid die casting performance. In the high-conductivity aluminum alloy, strontium (Sr) is introduced to replace the sodium (Na) in a conventional process to refine and modify eutectic silicon. Compared with conventional aluminum alloy to which Na is added, the high-conductivity aluminum alloy has the advantages of stability, long duration, and good reproducibility while avoiding gettering caused by the refinement and modification of conventional element Na.
A coated material for light alloy pulping, comprising the following components in parts by weight: 7-10 parts of modified dimethyl silicone oil, 8-15 parts of anionic and nonionic surface active complexing agent, 0.5-1 part of auxiliary emulsifier, 0.2-0.4 part of water-soluble polymer, 1.5-3 parts of conditioning agent, and 1-2 parts of defoamer. The preparation method for the coated material comprises: 1S, preparing the material, 2S, adding the anionic and nonionic surface active complexing agent to the water-soluble polymer for stirring, 3S, adding the modified dimethyl silicone oil, the auxiliary emulsifier, and the defoamer to the solution in 2S for stirring 10-30 minutes, 4S, adding the conditioning agent to the solution obtained in step 3S for stirring 60-80 minutes which are set, and 5S, measuring the pH of the emulsion to obtain the coated material for light alloy pulping.
Disclosed in the present invention is a die casting method for a filtering cavity, comprising: (1) transferring aluminum alloy liquid to a stirrer that is internally provided with an electromagnetic inductor and a stirring rod, the stirring rod penetrating an inner part of the stirrer; (2) covering the stirrer and pumping out air at the inner part of the stirrer; (3) initiating the stirrer to stir the aluminum alloy liquid under closed vacuum conditions, so that the aluminum alloy liquid is electromagnetically stirred in the direction of a magnetic field generated by the electromagnetic inductor, and while performing mechanical stirring under the action of the rotation of the stirring rod, stirring the aluminum alloy liquid to a semi-solid state and stopping the stirring to obtain a semi-solid aluminum alloy slurry; and (4) injecting the semi-solid aluminum alloy slurry obtained in step (3) into a filtering cavity die, die casting and molding at an injection speed of 1.5-2.5 meters per second, an injection specific pressure of 30-80 megapascals, and a boost pressure of 60-80 megapascals, and maintaining for 7-30 seconds to obtain a filtering cavity, wherein the temperature of the filtering cavity die is set to 250-400 degrees Celsius.
Provided is a preparation method for a low density metal matrix composite: (1) preparing a metal or alloy having a density of 1.8-8.9 g/m3, and heating until molten to obtain a liquid metal; (2) preparing a non-metallic material having a density of 0.3-1.2 g/m3, and crushing the non-metallic material into non-metallic granules having a granularity of 500-800 mesh; (3) dispersing the non-metallic granules in step (2) in the liquid metal obtained in step (1) to form a mixed melt; (4) mechanically stirring the mixed melt obtained in step (3) with a stirring rod while adding argon to the mixed melt, the stirring speed of the stirring rod being set at 1200-2200 r/min, the stirring time being set at 10-180 seconds, to obtain a semi-solid metal matrix composite slurry, the flow of the compressed gas being set at 8-25 l/min; (5) die-casting the semi-solid metal matrix composite slurry obtained in step (4) to obtain a low density metal matrix composite.
Provided is a high thermal conductivity aluminium alloy, containing the following components in percentage by weight: 80-90% Al, 6.5-8.5% Si, 0.2-0.5% Fe, 0.8-3% Zn, 0.03-0.05% V, 0.01-1% Sr, and 0.02-0.08% graphene. The high thermal conductivity aluminium alloy optimises alloy elements such as Si, Fe and Zn, elements such as Sr, V and graphene are added, and the amounts of the various components are controlled in a coordinated and matched manner, so as to obtain high thermal conductivity, good casting performance and excellent semi-solid die-casting performance. Graphene is added to the high thermal conductivity aluminium alloy, and the good thermal conductivity of the graphene is applied to the aluminium alloy, so as to obtain the high thermal conductivity aluminium alloy.
A slurry production apparatus for a semi-solid slurry, said apparatus comprising a rotor stirring machine (1) and a slurry production tank (2), the rotor stirring machine (1) comprising a stirring drum (9) and a rotor stirring rod (4) extending from the stirring drum (9) into the slurry production tank (2), the inside of the stirring drum (9) being provided with a drive apparatus used for driving the rotor stirring rod (4) to rotate, the end surface of the stirring drum (9) facing the slurry production tank (2) being provided with a transmission gear (6), the rotor stirring rod (4) being in a meshed connection with the transmission gear (6), the transmission gear (6) being provided with n teeth, the distance between adjacent front teeth and rear teeth being a, the tooth width of each tooth being b, the end of the at least one rotor stirring rod (4) connected to the transmission gear (6) being provided with meshing teeth matched with the transmission gear (6), each rotor stirring rod (4) comprising m meshing teeth, the distance between adjacent front meshing teeth and rear meshing teeth being b, the tooth width of each meshing tooth being a. The slurry production apparatus uses the combined mechanical stirring means of the rotation and the revolution of the stirring rod, and a prepared slurry has dense, fine and evenly distributed grains, so that the quality and performance of a produced semi-solid slurry can be controlled.
B22D 1/00 - Treatment of fused masses in the ladle or the supply runners before casting
B22D 17/20 - AccessoriesPressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure Details
A semi-solid die-cast heat dissipation casing, comprising a semi-solid die-cast casing body, several heat dissipation tooth grooves arranged on a back surface of the semi-solid die-cast casing body, and semi-solid die-cast heat dissipation fins embedded within the heat dissipation tooth grooves. The semi-solid die-cast heat dissipation fins form three heat dissipation areas, which are respectively a first heat dissipation area and a third heat dissipation area symmetrically arranged on two ends of the back surface of the semi-solid die-cast casing body, and a second heat dissipation area arranged between the first heat dissipation area and the third heat dissipation area. The height of the semi-solid die-cast heat dissipation fins of the first heat dissipation area and the third heat dissipation area is 50-150 millimetres, the height of the semi-solid die-cast heat dissipation fins of the second heat dissipation area is 120-180 millimetres, and the height ratio of the semi-solid die-cast heat dissipation fins of the first and third heat dissipation areas and the second heat dissipation area is 1:1.5-1.7.
A method for continuous semisolid die casting. The method is achieved using an apparatus for continuous semisolid die casting. The apparatus includes: a first preparation device for producing a nucleating agent, a second preparation device for producing semisolid slurry, a semisolid die casting machine, and a central controller. The second preparation device includes a slurry generator. The method includes: controlling, by the central controller, the first preparation device to produce a solid nucleating agent, and delivering the solid nucleating agent to the slurry generator of the second preparation device; controlling, by the central controller, the second preparation device to produce semisolid slurry, and delivering the semisolid slurry to the semisolid die casting machine; and controlling, by the central controller, the semisolid die casting machine to perform semisolid die casting.
C22B 9/10 - General processes of refining or remelting of metalsApparatus for electroslag or arc remelting of metals with refining or fluxing agentsUse of materials therefor
B22D 1/00 - Treatment of fused masses in the ladle or the supply runners before casting
A method for preparing semisolid slurry. The method is achieved using a device for preparing semisolid slurry. The device includes a slurry vessel and a mechanical stirring rod. The mechanical stirring rod includes a first end and a second end extending into the slurry vessel. The method includes: S1. putting a molten alloy having a first preset temperature into the slurry vessel; S2. cooling the molten alloy to a second preset temperature, positioning the second end of the mechanical stirring rod to be 5-25 mm higher than the bottom wall of the slurry vessel, rotating the mechanical stirring rod and injecting a cooling medium into the mechanical stirring rod; and S3: allowing the temperature of the molten alloy to be 10-90 degrees centigrade lower than the liquidus temperature of the molten alloy, stopping stirring and cooling, to yield a semisolid slurry.
A die-casting process method for die-cast molding of a metal in a semi-solid state, wherein a semi-solid state die-casting machine is used as a processing device and a pulper is used as a device for preparing and delivering a slurry in a semi-solid state; the method comprises the steps: spraying a mold release agent and mold clamping; melting the raw material and keeping the temperature; adding a metal modificator into the molten raw material to prepare the slurry in a semi-solid state; transferring the slurry in a semi-solid state into a mold by the pulper; die-casting, opening the mold and exporting a die-cast; removing the sprue to obtain the final die-cast. In the process method, a metal modificator is added to the liquid metal raw material during the preparation of the slurry in a semi-solid state so as to generate more crystal nuclei, so that die-cast products have better mechanical properties; by way of die-casting the slurry in a semi-solid state, during mold stripping the die-cast is low in temperature and small in deformation quantity, and the best shapes and surface smoothness of the product can be guaranteed; and the die-cast is compact interiorly with producing air holes, and the best interior structure and mechanical properties of the die-cast product are guaranteed.
An alloy modifying agent for use in preparing a metal semisolid slurry, where the components and mass ratio thereof is silicon:iron:copper:manganese:magnesium:zinc:titanium:lead:aluminum having a mass ratio of (6.05-6.95):(0.15-0.45):(0.12-0.65):(0.002-0.006):(0.001-0.5):(0.025-0.05):(0.002-0.08):(0.002-0.06):(90.5-93.2). Also, a method for preparing the alloy modifying agent and a method for using the alloy modifying agent. The alloy modifying agent is capable of increasing the solid-liquid ratio and the spherical crystal content of the semisolid slurry, increasing the preparation efficiency of the semisolid slurry and the quality of the slurry, and ensuring the quality of a final die casting product.
B22D 21/00 - Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedureSelection of compositions therefor
B22D 17/00 - Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
19.
SEMISOLID PRODUCTION METHOD AND SYSTEM USING CONTINUOUS DIE CASTING TECHNIQUE
Provided is a semisolid production method using a continuous die casting technique, and execution of the following steps of the method is controlled by a central controller (1): controlling a nucleating agent preparation device (2) to produce a solid nucleating agent and to deliver the solid nucleating agent to a liquid slurry holding container of a semisolid slurry preparation device (3); controlling the semisolid slurry preparation device (3) to produce a semisolid slurry and to deliver the semisolid slurry to a semisolid die casting machine (4); and controlling the semisolid die casting machine to perform die casting. A semisolid production system using a continuous die casting technique comprises a nucleating agent preparation device, a semisolid slurry preparation device, a semisolid die casting machine, and a central controller. The production method and the production system can reduce the time required for preparing a slurry, increase a solid content in the slurry, provide refined and uniform globular grains, improve efficiency in preparing a semisolid slurry, enable quality of the semisolid slurry to remain stable, and realize stable production of an integrated semisolid device using a die casting technique.
A method of preparing a semi-solid slurry, in which combined mechanical stirring and liquid cooling phases are used to prepare a semi-solid slurry, the method comprising control processes for stirring speed, cooling medium temperature and cooling medium flow amount at different slurry temperatures. The method prepares a semi-solid slurry spherical wafer with high regularity and good quality. Further provided is a slurry-preparing device suitable for the preparation method, comprising structures such as a slurry-accommodating receptacle (2), a mechanical stirring rod (3), a stirring blade member (8), a cooling medium controller (7), a cooling medium inlet pipe (4) and a cooling medium liquid return pipe (6), wherein, the stirring blade member (8) is inserted in mechanical stirring rod (3), such that during the stirring process it can function as a heat exchange element. The method and device for preparing a slurry has high efficiency, is suitable for preparation of a semi-solid slurry of multiple types of alloys such as an aluminum alloy, a magnesium alloy, a zinc alloy or a copper alloy, and resolves the problem of a low solid content in a semi-solid slurry and poor slurry quality.
A die-casting process method for die-cast molding of a metal in a semi-solid state, wherein a semi-solid state die-casting machine is used as a processing device and a pulper is used as a device for preparing and delivering a slurry in a semi-solid state; the method comprises the steps: spraying a mold release agent and mold clamping; melting the raw material and keeping the temperature; adding a metal modificator into the molten raw material to prepare the slurry in a semi-solid state; transferring the slurry in a semi-solid state into a mold by the pulper; die-casting, opening the mold and exporting a die-cast; removing the sprue to obtain the final die-cast. In the process method, a metal modificator is added to the liquid metal raw material during the preparation of the slurry in a semi-solid state so as to generate more crystal nuclei, so that die-cast products have better mechanical properties; by way of die-casting the slurry in a semi-solid state, during mold stripping the die-cast is low in temperature and small in deformation quantity, and the best shapes and surface smoothness of the product can be guaranteed; and the die-cast is compact interiorly with producing air holes, and the best interior structure and mechanical properties of the die-cast product are guaranteed.
An alloy modifying agent for use in preparing a metal semisolid slurry, where the components and mass ratio thereof is silicon : iron : copper : manganese : magnesium : zinc : titanium : lead : aluminum having a mass ratio of (6.05-6.95):(0.15-0.45):(0.12-0.65):(0.002-0.006):(0.001-0.5):(0.025-0.05):(0.002-0.08):(0.002-0.06):(90.5-93.2). Also, a method for preparing the alloy modifying agent and a method for using the alloy modifying agent. The alloy modifying agent is capable of increasing the solid-liquid ratio and the spherical crystal content of the semisolid slurry, increasing the preparation efficiency of the semisolid slurry and the quality of the slurry, and ensuring the quality of a final die casting product.
patents
