Patent•
Process for casting aluminum alloy wheel and heat treatment process
08 Aug 2012-
TL;DR: In this paper, a process for casting an 8356 type A356 aluminum alloy wheel and a heat treatment process is described, where a filter screen is arranged at a riser tube to effectively prevent inclusions.
Abstract: The invention discloses a process for casting an 8356 type A356 aluminum alloy wheel and a heat treatment process. The process comprises the following steps of: a, adopting a metal mold low-pressure casting process, wherein the pouring temperature is between 690 and 735 DEG C, and the die preheating temperature is between 250 and 350 DEG C; b, performing thinning in a smelting furnace, adjusting the content of iron and silicon in aluminum liquid, performing metamorphosis in a refining pack and nitrogen-blowing refining outside the furnace, and adjusting the content of magnesium, strontium andtitanium in the aluminum liquid; c, adding a cooling pipe to a thick and big part of the wheel to perform quick cooling, and filling insulation cotton on the periphery of a side die to slow down the cooling speed of the middle part of a wheel rim so as to realize solidification in order; and d, cooling a wheel cast and putting the wheel cast into a heat treatment kiln to perform solution and aging treatment. In the process, suitable pouring temperature and reasonable cooling measures are adopted to effectively realize feeding and shrinkage of the cast; in the pouring process, a filter screen is arranged at a riser tube to effectively prevent inclusions; and through the control of key technological parameters, the product quality of the 8356 type A356 aluminum alloy wheel cast is ensured.
Citations
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07 Mar 2012
TL;DR: In this article, a low-pressure casting method of an aluminum alloy automobile hub is presented, by optimizing alloy component design, adding a proper amount of Al-Ti-B-C refining agent and rare-earth modifying agent, low pressure casting process parameters and thermal treatment parameters.
Abstract: The invention discloses a low-pressure casting method of an aluminum alloy automobile hub. In the method, by optimizing alloy component design, adding a proper amount of Al-Ti-B-C refining agent and rare-earth modifying agent, low-pressure casting process parameters and thermal treatment parameters are optimized, so that the prepared automobile hub is provided with a tissue consisting of fine and uniform a dendritic crystal and fine and uniform worm-shaped or spherical silicon, and the performance of the aluminum alloy automobile hub is improved.
30 citations
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11 Jan 2012
TL;DR: In this paper, a casting process for aluminum-silicon-magnesium casted aluminum alloy is described, which enables the aluminum alloy to have the advantages of low cost and good corrosion resistance.
Abstract: The invention relates to aluminum-silicon-magnesium casted aluminum alloy and a casting process thereof. The aluminum alloy contains the following elements by mass: silicon 6.5 to 7.5, magnesium 0.40 to 0.60, titanium 0.10 to 0.30, strontium 0.01 to 0.03, iron no more than 0.20, copper no more than 0.10, zinc no more than 0.20, manganese no more than 0.10, beryllium no more than 0.01 and vanadium no more than 0.20, with the balance being aluminum. The casting process for the aluminum alloy comprises the following steps: putting A356.2 aluminum ingots in a furnace for melting; adding a modification material for refining; standing the product obtained in the previous step for a predetermined time and carrying out casting; sequentially carrying out solid solution, cooling, transfer and aging treatment. The invention enables the problems of low strength and elongation percentage of aluminum-silicon alloy and poor casting performance and corrosion resistance of aluminum-copper alloy and aluminum-zinc alloy to be overcome and tensile strength, toughness and casting performance of the aluminum alloy to be improved, and enables the aluminum alloy to have the advantages of low cost and good corrosion resistance.
24 citations
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09 Oct 2013
TL;DR: In this paper, a wheel hub machining method based on low-pressure casting is presented. But the method is not suitable for wheel hub fabrication, as it requires high-purity nitrogen to be added to the aluminum liquid.
Abstract: The invention provides an automobile wheel hub machining method. The automobile wheel hub machining method comprises the following steps of a smelting process, low-pressure casting, heat treatment, precision machining and surface coating. In the smelting process, silicon metal is added to aluminum liquid when the temperature of the aluminum liquid rises to 760DEG C, the silicon metal and the aluminum liquid are stirred for 25-30 minutes in an electromagnetic mode, wherein the content of the silicon metal is between 6.5% and 7.5%. When the aluminum liquid flows out of a furnace, AlSr alloy, AlTi5B alloy and magnesium are added to a flowing groove, wherein the content of Sr is between 0.008% and 0.012%, the content of Ti is between 0.1% and 0.2%, and the content of the magnesium is between 0.24% and 0.34%. In the low-pressure casting process, the aluminum liquid starts to flow out of the furnace under the temperature between 740DEG C to 750DEG C, refining and degassing are conducted on the aluminum liquid through high-purity nitrogen by 12 minutes, and then the aluminum liquid is conveyed to a low-pressure casting machine heat preserving furnace and is cast. In the heat treatment process, solid solution treatment, aging treatment and hardening treatment are conducted on a semifinished wheel hub formed after casting so as to obtain mechanical properties required by a wheel hub. The automobile wheel hub machining method can improve strength, hardness and forming of the wheel hub and meet requirements for safety performance of a wheel.
24 citations
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13 Feb 2013
TL;DR: In this paper, an aluminum alloy automobile wheel hub composite reinforcement technology is presented, where trace elements are added on the basis of original alloy components to carry out a reasonable component optimization, and effective purification, crystal grain refinement, deterioration treatment and finished product heat treatment are carried out in the melting process to simultaneously guarantee the good casting performance and the better mechanical performances of the alloy.
Abstract: The invention discloses an aluminum alloy automobile wheel hub composite reinforcement technology. Trace elements (comprising Mg, Ti, B, RE and the like) are added on the basis of original alloy components to carry out a reasonable component optimization, and effective purification, crystal grain refinement, deterioration treatment and finished product heat treatment are carried out in the melting process to simultaneously guarantee the good casting performance and the better mechanical performances of the alloy. The tensile strength, the yield strength and the elongation rate of aluminum alloy wheel hub products produced through utilizing the technology reach 262MPa, 179MPa and 9% respectively, and exceed strength performance standards in the Chinese wheel hub industry, so the technology has the advantages of certain practical production meaning, heat treatment period shortening, and substantial saving of the production cost.
9 citations
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05 Nov 2014
TL;DR: In this article, a low-pressure cast spinning short process of aluminum alloy hubs is presented, which includes the steps of smelting, casting, spinning, and heat treatment.
Abstract: The invention provides a low-pressure cast spinning short process of aluminum alloy hubs. The process includes the steps of 1, smelting; 2, performing low-pressure casting; 3, heating semi-finished products, to be specific, controlling furnace gas temperature of a semi-finished product heating furnace to be 435-485 DEG C and temperature of semi-finished products to be 380-400 DEG C; 4, performing spinning; 5, performing heat treatment, to be specific, performing solid solution treatment, namely controlling the furnace gas temperature of a solid solution furnace to be 580-600 DEG C and temperature of semi-finished products to be 535+/-5 DEG C, and performing ageing treatment, namely controlling furnace gas temperature of an ageing furnace to be 210-230 DEG C and temperature of semi-finished products to be 155-160 DEG C; 6, performing cooling, to be specific, cooling the semi-finished products to normal temperature and performing surface inspection to the products; 7, drilling center holes, to be specific, machining the products according to an operating process of an automatic drilling machine and the diameters of drilled holes. The low-pressure cast spinning short process of the aluminum alloy hubs has the advantages that quality of cast products can be improved, and energy saving and process shortening can also be achieved.
9 citations
References
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10 Oct 2007
TL;DR: In this article, a method for thermal treatment of high efficiency and high performance low-pressure die casting A356 alloy wheel was proposed, which comprises: performing solid solution treatment at 535-545 deg.C for 5-7 h, quenching, performing low-temperature pre-aging treatment, and then performing aging treatment at 175-185 deg.c for 3-5 h immediately.
Abstract: This invention relates to a method for thermal treatment of high-efficiency and high-performance low-pressure die casting A356 alloy wheel. The method comprises: performing solid solution treatment at 535-545 deg.C for 5-7 h, quenching, performing low-temperature pre-aging treatment, and then performing aging treatment at 175-185 deg.C for 3-5 h immediately. The method has such advantages as shortened solid solution treatment time, shortened aging treatment time, high strength of low-pressure die casting A356 alloy wheel, shortened thermal treatment period, increased production efficiency, and improved mechanical properties of low-pressure die casting A356 alloy wheel.
15 citations
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21 Mar 2000
TL;DR: In this paper, the compositional amt. of the Al-Ti-C aluminum alloy for casting, based on pure aluminum contg. inevitable impurities, is specified.
Abstract: PROBLEM TO BE SOLVED: To obtain an alloy in which the Al3Ti structure formed in the solidifying stage is refined, thereby shrinkage cavities are reduced, plastic working is hardly needed, and cracking is hard to be generated even if plastic working is executed, to pure aluminum contg. inevitable impurities, by specifying the compositional amt. of carbon and the compositional amt. of titanium with respect to pure aluminum with inevitable impurities. SOLUTION: In an Al-Ti-C aluminum alloy for casting, based on pure aluminum contg. inevitable impurities, the compositional amt. of carbon is controlled to 0.1 to 1.5 wt.%, and the compositional amt. of titanium lies in the range in which the value subtracted four times of the carbon compositional amt. (weight%) from the titanium compositional amt. (weight%) is made 1.6 to 13 wt.%. In this aluminum alloy for casting, the Al3Ti structure formed in the solidifying stage is refined and uniformized, so that shrinkage cavities in the cast product can remarkably be reduced to improve the productive yield, furthermore, defects in the product are few, the quality and strength are improved, and cracking in the product is hard to be generated even if plastic working is executed.
11 citations