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Low pressure casting process of aluminum alloy wheel hub

A technology of aluminum alloy wheel hub and low-pressure casting, which is applied in the field of auto parts processing, to achieve the effect of improving tensile strength and elongation, and improving the excellent rate of finished products

Active Publication Date: 2017-08-25
山东金马汽车装备科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The inventors of the present invention have found through research that the mechanical properties of the aluminum alloy hub can be effectively improved by increasing the magnesium content in the aluminum alloy, and the problem of excessively high magnesium content in the aluminum alloy can be overcome by the low-pressure casting process of "heat preservation-differential cooling". Incomplete mold, shrinkage cavity, hot crack and shrinkage defects make the structure compact, thus significantly improving the mechanical properties of aluminum alloy castings

Method used

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  • Low pressure casting process of aluminum alloy wheel hub

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The low-pressure casting process of an aluminum alloy wheel hub comprises the following steps:

[0023] 1) Melting the aluminum alloy material to obtain aluminum liquid, the weight percentage of the main components of the aluminum liquid is Si 7.1, Mg4.9, Ti 0.13, Fe 0.05 and the balance of Al, and the melting temperature is 850°C;

[0024] 2) Preheat the mold to 500°C and keep it warm for 0.5 hours;

[0025] 3) The molten aluminum in step 1) is taken out of the furnace at 730°C, degassed with high-purity nitrogen for 15 minutes, and then transferred to the holding furnace of a low-pressure casting machine at 680°C for 1 hour; pressurize to 0.04Mpa and the molten aluminum enters the riser Lift the liquid for 5-10s; pressurize to 0.09Mpa until the liquid aluminum fills the mold cavity, then adjust the pressure to 0.07Mpa for pressure holding, and the holding time is 280s.

[0026] 4): After the molten aluminum fills the mold cavity, the lower mold of the mold is cooled ...

Embodiment 2

[0029] The low-pressure casting process of an aluminum alloy wheel hub comprises the following steps:

[0030] 1) Melting the aluminum alloy material to obtain aluminum liquid, the weight percentage of the main components of the aluminum liquid is Si 6.8, Mg4.5, Ti 0.15, Fe 0.08 and the balance of Al, and the melting temperature is 900°C;

[0031] 2) Preheat the mold to 500°C and keep it warm for 0.5 hours;

[0032] 3) The molten aluminum in step 1) is taken out of the furnace at 730°C, degassed with high-purity nitrogen for 15 minutes, and then transferred to the holding furnace of a low-pressure casting machine at 670°C for 1 hour; pressurize to 0.06Mpa and the molten aluminum enters the riser Carry out liquid raising, the liquid raising time is 5-10s; pressurize to 0.1Mpa until the aluminum liquid fills the mold cavity, and then adjust the pressure to 0.06Mpa to hold the pressure, the holding time is 300s.

[0033] 4): After the molten aluminum fills the mold cavity, the l...

Embodiment 3

[0036] The low-pressure casting process of an aluminum alloy wheel hub comprises the following steps:

[0037] 1) Melting the aluminum alloy material to obtain aluminum liquid, the weight percentage of the main components of the aluminum liquid is Si 7, Mg 4.5, Ti 0.14, Fe 0.07 and the balance of Al, and the melting temperature is 900°C;

[0038] 2) Preheat the mold to 500°C and keep it warm for 0.5 hours;

[0039] 3) The molten aluminum in step 1) is taken out of the furnace at 720°C, degassed with high-purity nitrogen for 15 minutes, and then transferred to the holding furnace of a low-pressure casting machine at 695°C for 1 hour; pressurize to 0.05Mpa and the molten aluminum enters the riser Carry out liquid raising, the liquid raising time is 5-10s; pressurize to 0.1Mpa until the aluminum liquid fills the mold cavity, and then adjust the pressure to 0.06Mpa to hold the pressure, the holding time is 280s.

[0040] 4): After the molten aluminum fills the mold cavity, the lowe...

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Abstract

The invention discloses a low-pressure casting technology for aluminum alloy hubs. The low-pressure casting technology includes the steps of 1, smelting aluminum alloy and obtaining molten aluminum, wherein the molten aluminum mainly comprises, by weight percentage, 6.8-7.2% of Si, 4.5-5% of Mg, 0.1-0.15% of Ti, 0.05-0.1% of Fe and the balance Al, and the smelting temperature is 800-950 DEG C; 2, preheating a mold to 500 DEG C and maintaining the temperature; and 3, starting discharging the molten aluminum at 720-730 DEG C, carrying out degasification through high-purity nitrogen gas, maintaining the molten aluminum in a holding furnace of a low-pressure casting machine for one hour at 670-695 DEG C, rising the molten aluminum for 5-10 seconds when the pressure is increased to 0.04-0.06 Mpa, increasing the pressure to 0.08-0.1 Mpa until a mold cavity is filled with the molten aluminum, then adjusting the pressure to 0.06-0.07 Mpa and maintaining the pressure for 200-300 seconds. The aluminum alloy hubs manufactured through the technology have high hardness, high tensile strength, high ductility and high toughness, the defects such as incompleteness, shrinkage cavities, heat cracks and shrinkage cracks of the hubs are few, and the rate of finished products is greatly increased.

Description

technical field [0001] The invention relates to the field of auto parts processing, in particular to a low-pressure casting process of an aluminum alloy wheel hub. Background technique [0002] With the development of society, automobiles have become an indispensable means of transportation for people to travel. As important accessories in automobiles, the quality of automobile wheels not only affects the appearance of automobiles, but also affects the safety of automobiles. Aluminum alloy wheels have been widely used in the field of automobile wheel manufacturing due to their light weight, high strength, good braking balance, high precision, good thermal conductivity, and low fuel consumption. [0003] Although the performance of aluminum alloy wheels is much better than that of steel wheels, the difference in aluminum alloy composition and casting process also makes the performance of aluminum alloy wheels quite different. At present, the main aluminum alloy wheel hub pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/02B22D18/04B22D27/04
CPCB22D18/04B22D27/04C22C21/02
Inventor 李政霖
Owner 山东金马汽车装备科技有限公司