32results about How to "Overcome casting cracks" patented technology

The invention provides a high-intensity aluminum alloy material for an automobile hub and a production technology thereof. The aluminum alloy material comprises the following components in percentage by mass: 2.2-3.7% of Si, 0.4-0.8% of Mg, 0.05-0.12% of Mn, 0.2-0.35% of Ti, 0.02-0.04% of W, 0.01-0.025% of Sr, 0.05-0.09% of Y, 0.02-0.07% of Cu, 0.12-0.26% of Ni, 0.05-0.12% of Zr, and the balance Al and inevitable impurities. The aluminum alloy material produced by the technology is high in mechanical intensity, and outstanding in processing performance, casting performance and corrosion resistance, and can meet the requirement of modern science development on high-load and light-mass aluminum alloy structural components.

The invention relates to the field of metallurgy, in particular to a process for producing electronic aluminium alloy from recycled aluminium. The process comprises the following steps of (1) smelting, (2) stirring and slagging off; (3) standing; (4) sampling analysis; (5) burdening; (6) degassing and refining; (7) alloy replenishing; (8) segregating modifier adding; (9) filtering and secondary sampling; and (10) ultrasonic casting. An aluminium alloy product comprises the following elements in percentage by mass: 0.3%-0.6% of Si, 0.5%-0.6% of Fe, 0.45%-1.32% of Mg, 0.12%-0.27% of Cu, 0.11%-0.13% of Mn, 0.10%-0.22% of Zn, 0.03%-0.13% of Cr, and the balance of Al and inevitable impurity elements. The recycled aluminium produced through the process can reach the performance index of the aluminium alloy for an electronic product, and has higher economy and higher environment-friendly value.

The invention provides an antibacterial aluminum alloy material and a preparation method thereof. The antibacterial aluminum alloy material is composed of the following components by weight percentage: 2.3-3.4% copper, 0.5-1.2% manganese, 0.3-0.5% Cobalt, 0.5-1.1% magnesium, 0.13-0.25% samarium, 0.08-0.14% ytterbium, 0.22-0.34% gadolinium, 0.15-0.36% silver, 0.12-0.32% nickel, 0.5-0.9% titanium , 0.28-0.50% zirconium, 0.15-0.27% molybdenum, 0.08-0.2% scandium, 1.2-2.6% silicon, and the rest is aluminum and a small amount of unavoidable impurities. In the present invention, by adding samarium, ytterbium, gadolinium, and silver into the aluminum alloy material, the antibacterial performance of the aluminum alloy material is improved, and the growth of bacteria is inhibited; the aluminum alloy material is improved by adding zirconium and molybdenum to the aluminum alloy material. The strength and plasticity of the material, and adding cobalt and scandium to the aluminum alloy material can effectively overcome casting cracks, improve the quality of the aluminum alloy, and increase the cost rate of the aluminum alloy product. According to the experimental results, the antibacterial rate of aluminum alloy products is above 99.999%, the hardness is above 88HRA, the strength is above 552MPa, the elongation rate is above 8.1%, and the pass rate of flaw detection is above 99%.

The invention discloses a liquid extrusion forming method for liquid extrusion of a steel ball. The forming method comprises the following steps of smelting, liquid die forging and heat treatment, wherein liquid extrusion comprises the following steps that after a liquid extrusion die is fixed to an indirect extrusion casting machine, a smelted steel ball solution is quantitatively poured into theliquid extrusion die, the casting temperature is 1500-1600 DEG C, the pressurization speed is 20-50 mm / s, the filling time is 1-8 s, the specific pressure is 150-250 mpa, and the pressure is maintained for 10-40 seconds under the pressure to obtain the near-final steel ball; and the residual-temperature quenching and low-temperature tempering of the liquid-state extruded near-end steel ball are utilized. According to the liquid-state extruded steel ball, the cost is reduced, and the production efficiency is improved; and meanwhile the microstructure state of the steel ball can be effectivelyensured, and the comprehensive mechanical property is improved.

The invention discloses high-strength wear-resistant aluminum alloy prepared from the following components in percentage by weight: 0.23% of yttrium oxide and neodymium oxide, 1.52% of silicon, 1.4% of copper, 0.37% of iron, 0.88% of cobalt and nickel, 0.14% of magnesium, 0.028% of titanium, strontium and beryllium, 0.14% of manganese, 0.02% of chromium and the balance of aluminum. The elements including titanium, strontium and beryllium which are at a fixed ratio are added into the aluminum alloy, so that the strength, wear resistance and toughness of the aluminum alloy are effectively improved; in addition, after the elements including cobalt and nickel which are at a fixed ratio are added into the aluminum alloy, a cast product can generate a favorable grain refinement function, casting cracks are effectively overcome, the appearance of a casting and the surface quality are improved, and the hardness of the aluminum alloy is improved; yttrium oxide and neodymium oxide which are at a fixed ratio are added and take a synergistic effect, so that the corrosion resistance of the aluminum alloy is improved; and the impact toughness of the aluminum alloy is effectively improved by 25.2%.

The invention discloses an aluminum alloy ingot. The aluminum alloy ingot comprises, by weight , 9.6%-12.0% of Si, 1.5%-3.5% of Cu, less than 0.3% of Mg, less than 1.3% of Fe, less than 1.0% of Zn, less than 0.5% of Mn, less than 0.5% of Ni, less than 0.3% of Sn, 1%.-2%. of Sr, 1%.-2%. of Ti, 1%.-2%. of B and the balance Al. The Si element is added to the aluminum alloy ingot so that strength and toughness of the aluminum alloy ingot are effectively improved, and the Ti and B elements added into the aluminum alloy ingot enables a die-casting product to generate good grain refinement, casting cracks are effectively avoided, the appearance of a casting is improved, the surface quality of the ingot is improved, particularly cold shut of the ingot is reduced, and the impact toughness of the aluminum alloy ingot is effectively improved by 15%-20% on the condition that the strength of the aluminum alloy ingot is not reduced.

A centrifugal casting technology for manufacturing roller of high-speed steel, which is composed of the roller body made of high-C high-W high-speed steel and the core made of cast iron, includes such steps as pouring the molten high-speed steel in the rotating mould of centrifugal machine, applying an electromagnetic field in the pouring and solidifying procedure, adding protecting agnet to the inner surface of roller body, pouring molten iron, cooling to lower than 100 deg.C, demoulding, coarse machining, quenching, tempering, and fine machining. Its advantages are high uniformity without segregation, and compact structure.

The application relates to the technical field of magnesium-aluminum alloy and its manufacture, and specifically discloses a high-strength, high-magnesium-aluminum alloy and its casting process. The high-magnesium aluminum alloy casting process includes the following steps: S1. Prepare raw materials for high-magnesium aluminum alloy preparation: prepare high-magnesium aluminum alloy raw materials in mass percentages, including Mg 7.96-11.02%, Mn 0.50-0.80%, Zr 0.1-0.9 %, Sc 0.30~0.56%, Fe 0.01~0.15%, Cd 0.02~0.16%, Ti 0.03~0.12%, Cr 0.3~0.52%, the balance is Al and other unavoidable impurities; S2, add after smelting aluminum ingot Other alloy raw materials and smelting; S3, refining; S4, adding grain refiner and removing slag; S5, casting; S6, annealing. The high-magnesium aluminum alloy of the present application has the advantage of excellent mechanical properties.

The invention relates to a production process of an aluminum alloy shell for an electronic product. The production process comprises the following steps of molten aluminum alloy melting, grain refinement, blowing refining in a furnace, online degassing filtering, semi-continuous casting, extrusion, quenching, aging treatment, hot isostatic pressing treatment and the like. The aluminum alloy product comprises the following elements in percentage by mass, including 9-11% of Si; 5-6% of Mg; 1.5-2.0% of Cu; 1.0-1.3% of Zn; 0.5-0.7% of Cu; 0.21-0.26% of Mn; 0.13-0.16% of Zr; 0.15-0.25% of Y; 0.015-0.03% of Ti; 0.003-0.006% of B; and the balance of Al and inevitable impurity elements. On the basis of ensuring the anodic oxidation performance of the aluminum alloy, the strength of the aluminum alloy is improved, and the aluminum alloy is an ideal material for manufacturing shells for electronic products and has very wide market application prospects.

The invention discloses a large-specification aluminum alloy round bar and a casting method thereof. according to the invention, raw materials are blended according to a formula, and are added into a smelting furnace; smelting and deslagging are carried out; the obtained material is delivered into a holding furnace, and on-line degassing and refining are carried out; degassing, deslagging, and purifying are carried out; an aluminum-titanium-boron grain refining agent is added for carrying out grain refinement; the obtained material is cast into an aluminum alloy round bar; and the aluminum alloy round bar is subjected to a homogenization treatment, such that an obtained aluminum alloy round bar can be prevented from cracking, and the tissue of the aluminum alloy round bar is refined. With the method provided by the invention, a diameter of the produced round bar can reach phi1320mm. Also, coring and casting stress of the round bar are eliminated, and product quality is ensured. Mechanical properties of the round bar can satisfy requirements of large structural parts.

The invention provides an insulation lifting platform. The insulation lifting platform comprises a base 7, a stand rod frame 2, a lifting frame 4 and an operation table 5 coaxially arranged in sequence from bottom to top, and is characterized in that a lifting basket 1 is arranged in the lifting frame 4. The insulation lifting platform is excellent in electric insulation performance, can satisfy the requirements of 1000 kilovolt electrified operation, is light in weight, is firm, satisfy safe operation demands, and is convenient to operate, use and transport.

The invention provides a high-strength aluminum alloy material and a preparation method thereof. The high-strength aluminum alloy material is composed of the following components by weight percentage: 2.3-3.4% copper, 0.8-1.4% manganese, 0.5-1.0% iron, 0.2-0.4% cobalt, 0.03-0.06% calcium, 0.15-0.42% nickel, 0.5-0.8% titanium, 0.15-0.42% nickel, 0.25-0.51% zirconium, 0.1-0.3% Molybdenum, 0.08-0.2% scandium, 2.1-4.2% silicon. In the present invention, the strength and plasticity of the aluminum alloy material are improved by adding zirconium and molybdenum to the aluminum alloy material, and the addition of cobalt and scandium to the aluminum alloy material can effectively overcome casting cracks, improve the quality of the aluminum alloy, and improve the quality of the aluminum alloy product. Cost rate. According to the experimental results, the strength of aluminum alloy products is above 547MPa, the elongation rate is above 7.9%, and the qualified rate of flaw detection is above 99%.

The invention discloses an aluminum alloy material for an automobile hub. The material comprises the following components in percentage by mass: 12-15% of Si, 14.4-22.5% of Mg, 1-1.5% of Cu, 0.2-1.3% of Fe, 0.3-0.9% of Zn, 0.1-0.4% of Mn, 0.3-0.6% of Nb, 0.1-0.3% of Ni, 1-1.8% of Li, 0.1-1.5% of Re, 0.1-0.3% of Cr, 0.5-1% of Sr, 0.3-0.5% of Sn, 1-2% of mixed rare earth and the balance of Al. As aluminum is used as a main substance of the alloy, the density of the material is reduced, and the purpose of lightening the automobile hub is achieved; due to adoption of the element Sr added into the aluminum alloy, the strength and the toughness of the aluminum alloy are effectively improved; due to adoption of elements Ti and B, good grain refinement can be achieved for a pressure cast product, cast crack can be effectively overcome, and meanwhile good heat radiation properties are achieved.

The invention discloses a super large specification aluminum alloy slab ingot and a casting method. The method comprises the following steps: preparing raw materials according to ratio, then adding in a melting furnace for melting and removing the slag; conversing to a heat preserving furnace for on-line degassing and refining, degassing, removing the slag and purifying, adding an aluminum titanium boron grain-refining agent for refining the crystal grains; then casting to the aluminum alloy slab ingot; and finally homogenizing to obtain the aluminum alloy slab ingot with difficult cracking and refined tissue. The produced 650*2750mm slab ingot is capable of eliminating the segregation and casting stress of the slab ingot, and guaranteeing the product quality, the mechanical properties can satisfy the requirements of the large-scale structural members.

The present invention relates to a LF 2R High-neck flange, obtained by extrusion casting, has no weld seam, and its microstructure presents a continuous streamlined structural feature, and its streamlined shape is consistent with the direction of the flange shape; a preparation method of a LF2R high-neck flange of the present invention , the metal liquid crystallizes and solidifies under the pressure in the mold casting cavity composed of the upper pressure head, the female mold (5), the mold core (4) and the ejector pin (9); the extrusion casting process is: pouring at 700±15°C , The mold temperature is 250±50°C. When the mold is closed, the pressure gradually rises for no more than 5 seconds. When it reaches 25MPa, the pressure is kept for 1 minute 30 seconds to 2 minutes. The necked flange casting of the present invention has few internal defects, compact structure and high mechanical properties. The squeeze casting process has strong applicability, wide range of material selection, simple process, good stability, high casting quality, and easy casting. Implement automation.

The invention relates to an aluminum alloy ingot. The aluminum alloy ingot is prepared from, by weight percent, 7.2%-11.4% of Si, 1.2%-1.5% of Cu, 0.1%-0.3% of Mg, 0.2%-0.4% of Fe, 1.2%-1.4% of Zn, 0.2%-0.4% of Ni, 0.1%-0.3% of Sn, 1.2%-2.4% of Sr, 2.1%-2.4% of Ti, 2.1%-2.4% of B, 1.2%-1.4% of Sb, 0.3%-0.5% of As, 0.22%-0.44% of RE, 0.4%-1.4% of LaCe, 0.3%-0.5% of Pr and the balance Al and inevitable impurities, wherein the content of the impurities is not larger than 0.1%. The aluminum alloy ingot is good in comprehensive performance, resistant to corrosion and stable in performance.

The invention discloses a process for manufacturing an aluminum alloy ingot, which is characterized by including the steps of a, proportioning raw materials according to the proportion of each element of the product, b, placing proportioned raw materials into a smelting furnace for smelting, c, sampling and assaying, and adding silicon metal according to the results of assay, d, adding a cooling material to reduce the temperature of an aluminum liquid, e, stirring for uniform composition, f, sampling and assaying, and adding aluminum strontium alloy, aluminum titanium boron alloy and nontoxic refining agent according to the results of assay, g, purification, refining and deaeration, h, still standing for 15 min to 25 min, i, drossing slags onto a slag car, j, sampling and assaying, and supplementing or diluting in case of incompliance with standard requirements on composition, k, filtering for improved cleanliness of the aluminum liquid, and l, casting a portable ingot. Ingots cast from the process have less cold laps and cracks, and are characterized by high tenacity and strength.

The invention provides aluminum alloy for an automobile part. The aluminum alloy comprises the following components of Mg, Si, B, Ti, Cu, Cr, Zr, Fe, Sn, Co, Sc, Hf, and the balance Al and unavoidable impurities. Compared with the prior art, the Mg, Si, Cu, Cr and Zr elements are added into the aluminum alloy, so that the strength and toughness of the aluminum alloy are improved effectively; and through the Co, Sc, Hf, Ti and B elements added into the aluminum alloy, a die casting product can generate good grain refinement, the defect of casting cracks is overcome effectively, and the appearance of a casting and the surface quality of a cast ingot are improved. The invention further provides a die casting method for the automobile part, and the aluminum alloy for the automobile part is adopted. According to the aluminum alloy and the die casting method, the casting prepared through die casting, the defects such as pores or shrinkage cavities or misrun or unclear appearance outlines are overcome, and the product yield is high.

The invention discloses a hot-top casting process for a 7xxx series superhard aluminum alloy round rod with a diameter of 784mm. The aluminum alloy round rod contains the following chemical components by mass: Si 0.25%; Fe 0.4%; Cu 1.55-1.65%; Mn 0.25%; Mg 2.55-2.65%; Cr 0.19-0.25%; Zn 5.6-5.7%; Ti 0.15%; Zr 0.03%; d, refining; e, slag removal; f, heat preservation and standing; g, on-line refinement; h, on-line degassing; i, filtration; j, casting; k, homogeneous treatment. The process disclosed by the invention solves the defects such as cracks, component segregation, bright crystal grains, coarse grains, and loose pores that often occur when the large-diameter superhard aluminum alloy adopts the direct condensation casting technology, and the hot top casting solves the surface segregation Defects such as nodules and coarse grain thickness.