35results about How to "Improve grain refinement" patented technology

The invention discloses a large-diameter moderately-strong heat-resisting magnesium alloy thick-wall barrel-shaped piece forming process. The process includes the steps of large-furnace smelting, semi-continuous casting, homogenizing annealing, varying-temperature multi-direction forging, mechanical punching, ring rolling forming and aging treatment. The varying-temperature multi-direction forging is conducted on an oil press, pressing speed is 200-400mm/min, upsetting reduction in pass is 30-40%, drawing down reduction in pass is 5-10%, blank before ring rolling forming is kept at the temperature of 380-400 DEG C for 4-8 hours, and rolling deformation is 60-80%. The thick-wall barrel-shaped piece 700-1100mm in outer diameter, 50-100mm in wall thickness and 300-700mm in height is manufactured. The thick-wall barrel-shaped piece is high in strength and good in heat resistance and meets size and performance requirements of structural parts in the aerospace field.

The invention discloses a system and a method for continuous extrusion production of a fine-grain magnesium alloy strip. The system comprises a decoiling emptying device, an on-line straightening device, an on-line heating device, a continuous extrusion device, a cooling device and a winding displacement collection device. Through control of a temperature of a rod, a good extrusion driving force is produced between the rod and an extrusion wheel groove. Through an expansion mold cavity and a flow-blocking mold, magnesium alloy expansion flowing in a width direction is realized. In order to extrude a plate having larger width, the system adopts a two/three rod feeding-type extrusion mode so that joining and intermetallic welding of multiple rods in a corresponding multi-rod mold cavity are realized. The system and the method have the advantages that a process route is short; production efficiency is high; a grain refinement degree of a product microstructure is high; plate formability is good; and a continuous production line provided by the invention is suitable for industrial application.

The invention relates to a highly-polished prehardened die steel, and a preparation method thereof. The highly-polished prehardened die steel is composed of, by mass, 0.21 to 0.25% of C, Si<=0.30%, 1.40 to 2.00% of Mn, 1.30 to 1.70% of Cr, 0.60 to 1.00% of Ni, 0.40 to 0.60% of Mo, V<=0.10%, P<0.015%, S<0.005%, 0.02 to 0.04% of Nb, and the balance Fe. The preparation method comprises following steps: material blending, smelting, casting, and hot charging; high temperature diffusion heat treatment, multi-directional forging heat processing, after-forging heat treatment, and sawing; and hardeningand tempering heat treatment. The hardness of the obtained tempered martensite structure ranges from 38 to 42HRC. The advantages of the highly-polished prehardened die steel are that: cost is low, hardenability and hardness are high, and polishing properties and cleavage line etching performance are excellent.

The invention relates to the technical field of remanufacturing and repairing of aeronautical parts, in particular to a double-laser forging remanufacturing and repairing device for damaged mortises of a high-temperature alloy small-size structure turbine disc and an application method thereof. Firstly, the damaged surface of the turbine disc is cleared, and damaged residues and the like are removed; a numerical model is generated by scanning the surface of a component point by point, then a complete component three-dimensional model is generated on a computer through three-dimensional software, the complete component three-dimensional module is compared with an original three-dimensional model, and the positions of all points and the related sizes are determined; a short-pulse laser is utilized to conduct impact strengthening processing on notch parts firstly, so that material structures at the notch parts are refined, and the bondability of notches is improved; and then, double laserbeams are utilized to repair the damaged parts, wherein the first-beam continuous pulse laser serves as heat source molten metal powder to repair the damaged parts such as tenon teeth of the turbinedisc, and the second-beam short pulse laser directly acts on the surface of high-temperature laser cladding metal. The pulse width is changed according to the variable section size of the repaired mortises, and macroscopic deformation is controlled.

The invention belongs to the field of chemical materials and particularly relates to an aluminum alloy material, a preparation method and application of the aluminum alloy material in a solar energy photovoltaic support. The aluminum alloy material is composed of the following components of, by mass, 0.2%-0.4% of Si, 0.08%-0.20% of Cu, 0.6%-0.8% of Mg, 0.15%-0.25% of Zr, 0.15%-0.25% of Ti, 0.01%-0.15% of Mn and the balance aluminum and inevitable impurities. According to the designed aluminum alloy material, by adding metal elements of Si, Cu, Mg, Zr, Ti, Mn and the like, the grain refinementdegree is improved by a large margin, and the effect in the aspect of promoting the comprehensive properties such as tensile strength, the elongation and the corrosion-resistant property of the aluminum alloy material is significant. The aluminum alloy material is used for preparing a solar energy photovoltaic support profile, so that the corrosion-resistant property of the photovoltaic support prepared from the aluminum alloy material is better than that of a traditional aluminum alloy photovoltaic support component.

The invention relates to a molten soup forging method and a molten soup forging die. The molten soup forging method and the molten soup forging die comprise an upper die, a lower die and side dies, to-be-produced wheel-shaped die cavity is formed among the upper die, the lower die and the side dies, wherein the molten soup forging method and the molten soup forging die are characterized in that a lower die assembly formed by coaxially enclosing the plurality of side dies and the lower die is coaxially embedded in a pressure bearing die sleeve, and a hydraulic pressure lifting mechanism which is vertically upward and used for lifting products is coaxially arranged at the lower end of the lower die. The molten soup forging method and the molten soup forging die have the advantages of improving product quality, reducing molten soup dosage, improving inner structure refined grain of metals, improving product mechanical property, tensile property and other overall properties, shortening product production time, reducing equipment maintenance cost, increasing output, improving production efficiency and prolonging die service life.

The invention relates to a foamed aluminum material, in particular to high-impact-toughness foamed aluminum based on A356 aluminum alloy and a production process of the high-impact-toughness foamed aluminum. The production process comprises the steps that (1) 12-20 parts, by weight, of a foaming agent is ground and screened through a sieve with 100-180 meshes; (2) 100 parts, by weight, of A356 aluminum alloy ingots are crushed, ground into particles and then evenly mixed with 8-15 parts, by weight, of inorganic nano-whiskers and 10-12 parts, by weight, carbon nano-tubes, then a mixture is placed into a smelting furnace and completely molten in an inert gas atmosphere, afterwards, the foaming agent is sucked in to the smelting furnace under negative pressure, and a molten aluminum mixture is obtained after uniform mixing; (3) the molten aluminum mixture obtained in the step (2) is poured into a mold, the mold is then pushed into a foaming furnace, and heat preservation is conducted for1-2h at the temperature of 680-700 DEG C; and (4) the mold enters a cooling system to be cooled, and thus the foamed aluminum is obtained. According to the high-impact-toughness foamed aluminum basedon the A356 aluminum alloy and the production process of the high-impact-toughness foamed aluminum, the mixture of the inorganic nano-whiskers and the carbon nano-tubes is added in the forming processof the foamed aluminum, and thus the impact toughness of the aluminum is remarkably improved.

The invention relates to a laser-assisted liquid metal synchronously-casting mould-free forming method. The laser-assisted liquid metal synchronously-casting mould-free forming method comprises the steps that (1) a laser device is made to aim at a movement front area to be covered with a melt, the time when the laser device is started and the time when the laser device is stopped are set to be synchronous with the time when a base plate starts to move and the time when the base plate stops moving in control software, a laser device power source is started, the parameters of the laser device are adjusted, and the preparation is made for light emitting; (2) a movement switch is turned on, the melt is squeezed out of a crucible under pressure and falls onto the base plate below an outlet of the crucible, and laser light is irradiated onto the movement front area, of the melt, on the base plate at the same time; and (3) forming is ended, the movement switch is turned off, pressurizing of the melt in the crucible is stopped, the melt stops flowing, and laser light irradiation is stopped at the same time. According to metal formed through cast rolling according to the method, the fineness of grains is high, and the compact degree approximates to or reaches the rolling level or the forging level; meanwhile, metallurgical bonding of interlayer interfaces can be well achieved, and the quality of formed products is high.

The invention discloses an improved CTP plate base aluminum alloy strip based on a 1052# aluminum alloy. The improved CTP plate base aluminum alloy strip is manufactured through the procedures of melting, refining, cast rolling, finish rolling, stretch bending and straightening. To save the production time and improve the production efficacy, a 1052# aluminum alloy strip is directly selected as araw material, the excellent physical and mechanical performance is reserved, meanwhile, an Al-Ti-B wire and a titanium-magnesium alloy strip are selected in a grain refining agent, the integral feeding amount of the titanium element is increased, and the grain refining degree is improved; due to the mixed magnesium element, the electrolysis quality is better improved, a sand mesh layer can be better finely and evenly improved, the sand mesh value Ra is greatly improved, and the CTP plate base quality requirement is completely met; and through the improvement on a runner, the feeding frequencyof aluminum molten liquid is improved, and rolling efficiency and quality improving is ensured as well. As a whole, the product CTP plate base aluminum alloy strip completely meets the CTP plate basequality requirement, and meanwhile the beneficial effects of the simple technology and the high production efficiency are achieved.

The invention provides a quick extruding and rolling reduction forming device and method for a titanium alloy tube blank. The device comprises a hydraulic cylinder, a sleeve assembly, a fixed rack, arotary turnplate and a mandrel which are successively arranged in a horizontal direction. By means of reasonable design and arrangement of a roll profile curve of a roller and a mandrel structure, thecross diameter of an oblique roller is decreased from middle to two sides, so that the roller has a certain feeding angle, a relatively large inlet taper angle and a relatively small outlet taper angle. Three oblique rollers fixed to the rotary turnplate are matched with the mandrel, so that an extruding and rolling reduction process of the tube blank is achieved. The device integrates the structural and movable characteristics of oblique rolling perforation, planetary rolling and extrusion, so that the preparation period can be shortened greatly, large plastic deformation of the metal tube blank is achieved, and a complex stress state needed by grain crushing and dynamic recrystallized grain refining is established, and therefore, the comprehensive performance of the tubular product is further improved.

The invention belongs to the field of chemical engineering materials and particularly discloses a treatment technique of aluminum alloy profiles for photovoltaic assembly supports. The technique comprises the steps of preparation of alloy raw materials, fused mixing of the alloy raw materials, refining and deslagging of molten aluminum, pouring of the molten aluminum, acid pickling of castings, plating assisting of the castings, and passivating treatment of the surfaces of the castings. According to the treatment technique, aiming at existing aluminum alloy materials, by adding metal elementssuch as Mn, Cu, Si, Mg and Ta and through reasonable formula design, the alloy strength is effectively improved, the grain refinement extent is greatly increased, and the effects on improvement of comprehensive properties such as the tensile strength, the elongation and the anti-corrosion property of aluminum alloys and the firm forming quality of oxidation films are remarkable.

The invention discloses a multi-directional extrusion strong deformation die. The multi-directional extrusion strong deformation die comprises a female die, an upper die pressure head and side pressure heads; and the female die is provided with a female die cavity. The invention further provides a multi-directional extrusion strong deformation process. The upper die pressure head moves downwards to extrude a blank; then the blank is extruded through four of the side pressure heads at intervals, and moving is stopped when the four pressure heads are connected in an abutted mode; and the blank continues being extruded through the other four side pressure heads at intervals till the four side pressure heads are connected in an abutted mode, and the extruding step is repeated till deformationis completed. The blank is synergistically extruded in multiple directions through the upper die pressure head and the multiple side pressure heads, the evenly-distributed excellent structure with thehigh grain refinement degree can be obtained, and the comprehensive performance of materials is remarkably improved; and the eight side pressure heads provide deformation in the eight loading directions, the problem that manual overturning is needed between times of a tradition process is solved, and because of the special process setting, the uniformity of structure refinement of all parts of the block materials is also improved.

The invention discloses a martensitic steel copious cooling and high-pressure twisting mold and method, and relates to the technical field of high-strength steel fine grain treatment. A mold with a groove formed in a lower mold is adopted, a USIBOR1500 martensitic high-strength steel plate is contained in liquid nitrogen in the groove of the lower mold, an upper mold descends to be pressed on theplate, the groove of the lower mold is filled with liquid nitrogen, then the upper mold and the lower mold are sealed, copious cooling treatment is carried out on a sample, and the treatment time is 20 min or 30 min; after copious cooling treatment, high-pressure twisting is carried out under the pressure being 4 GPa or 5 GPa, and the twisting angle is 360 degrees; and the USIBOR1500 martensitic high-strength steel plate subjected to copious cooling treatment of different processes and high-pressure twisting is subjected to vacuum electric field assisted recrystallization annealing treatment,the temperature is 750 DEG C, the soaking time is 20 min, and air cooling is carried out after heat preservation is finished. Grains of finally-prepared USIBOR1500 martensitic high-strength steel areeven tiny martensitic grains, and the yield strength, tensile strength and ductility of the steel are all improved to a certain degree by being compared with steel before treatment.

The invention discloses a treatment method for improving the supporting strength for an automobile storage battery, and belongs to the technical field of automobile machining. Specifically, special modified treatment is carried out on a supporting frame for supporting the automobile storage battery; and the treatment method comprises the steps of (1) cleaning the supporting frame, (2) drying the supporting frame, (3) carrying out variable temperature treatment, and (4) carrying out surface treatment. According to the treatment method for improving the supporting strength for the automobile storage battery, the characteristics of the final treated supporting frame are improved, the strength, the wear resistance, the corrosion resistance and the like are well improved, and therefore the supporting strength and the installation stability for the storage battery are effectively guaranteed, and a good significance is achieved on the improvement of the overall performance of an automobile.