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Low-pressure casting process for aluminum alloy hub

An aluminum alloy wheel, low-pressure casting technology, applied in the field of auto parts processing, can solve the problems of poor compactness, low elongation, low tensile strength, etc., and achieve the effect of improving the excellent rate of finished products, tensile strength and elongation.

Inactive Publication Date: 2018-04-13
张永
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the castings produced by low-pressure casting have low hardness, poor compactness, low tensile strength and low elongation, which are also obvious shortcomings of low-pressure casting.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A low-pressure casting process for an aluminum alloy wheel hub, comprising the following steps:

[0022] 1) Melting the aluminum alloy material to obtain aluminum liquid, the weight percentage of the main components of the aluminum liquid is Si7.1, Mg4.9, Ti0.13, Fe0.05 and the balance of Al, and the melting temperature is 850 °C;

[0023] 2) Preheat the mold to 550°C and keep it warm for 1 hour;

[0024] 3) The molten aluminum in step 1) is taken out of the furnace at 710°C, degassed with high-purity nitrogen for 15 minutes, and then transferred to the holding furnace of a low-pressure casting machine at 650°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.

[0025] 4): After the molten aluminum fills the mold cavity, the lower mold of the mold is cooled to 3...

Embodiment 2

[0027] A low-pressure casting process for an aluminum alloy wheel hub, comprising the following steps:

[0028] 1) Melting the aluminum alloy material to obtain aluminum liquid, the weight percentage of the main components of the aluminum liquid is Si6.8, Mg4.5, Ti0.15, Fe0.08 and the balance of Al, and the melting temperature is 900 °C;

[0029] 2) Preheat the mold to 550°C and keep it warm for 1 hour;

[0030] 3) The molten aluminum in step 1) is taken out of the furnace at 700°C, degassed with high-purity nitrogen for 15 minutes, and then transferred to the holding furnace of a low-pressure casting machine at 650°C for 1 hour; pressurized to 0.06Mpa, 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.

[0031] 4): After the molten aluminum fills the mold cavity, the lower m...

Embodiment 3

[0033] A low-pressure casting process for an aluminum alloy wheel hub, comprising the following steps:

[0034] 1) Melting the aluminum alloy material to obtain aluminum liquid, the weight percentage of the main components of the aluminum liquid is Si7, Mg4.5, Ti0.14, Fe0.07 and the balance of Al, and the melting temperature is 800 °C;

[0035] 2) Preheat the mold to 550°C and keep it warm for 1 hour;

[0036] 3) The molten aluminum in step 1) starts to be released at 710°C, degassed with high-purity nitrogen for 15 minutes, and then transferred to the holding furnace of a low-pressure casting machine at 650°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.

[0037] 4) After the molten aluminum fills the mold cavity, the lower mold of ...

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PUM

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Abstract

The invention discloses a low-pressure casting process for an aluminum alloy hub and belongs to the technical field of automobile part machining. The process comprises the following operating steps of1, conducting smelting on an aluminum alloy material, so that molten aluminum is obtained, wherein the smelting temperature is 750-900 DEG C; 2, preheating a mold to 550 DEG C, and conducting heat preservation for one hour; and 3, starting to discharge the molten aluminum obtained in step 1 out of a furnace at the temperature of 700-710 DEG C, conducting degassing for 15 minutes through high-purity nitrogen gas, then, transferring the molten aluminum into a low-pressure casting machine heat preservation furnace, conducting heat preservation for one hour at the temperature of 670-695 DEG C, increasing the pressure to 0.04-0.06 MPa till the molten aluminum enters a liquid ascending pipe for liquid ascending which lasts for 5-10 seconds, increasing the pressure to 0.08-0.1 MPa till a cavityof the mold is filled with the molten aluminum, and then adjusting the pressure to 0.06-0.07 MPa for pressure maintaining which lasts for 200-300 seconds. The aluminum alloy hub produced through the process has the beneficial effects of being high in hardness, tensile strength and elongation and good in toughness; in addition, the hub defectiveness problems such as incompleteness, shrinkage cavities, heat cracks and shrinkage cracks are reduced; and the yield is greatly increased.

Description

technical field [0001] The invention belongs to the technical field of auto parts processing, and in particular relates 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 alumin...

Claims

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Application Information

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IPC IPC(8): B22D18/04C22C21/02
CPCB22D18/04C22C21/02
Inventor 张永
Owner 张永
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