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.

Low-pressure casting method of aluminum alloy automobile hub

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.

Aluminum-silicon-magnesium casted aluminum alloy and casting process thereof

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.

Automobile wheel hub machining method

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.

Aluminum alloy automobile wheel hub composite reinforcement technology

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.

Low-pressure cast spinning short process of aluminum alloy hubs

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.

Haiyan Wang

Papers

Process for casting aluminum alloy wheel and heat treatment process