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A casting method for improving the mechanical properties of large-size aluminum alloy wheels

An aluminum alloy, large-size technology, applied in the field of aluminum alloy casting, can solve problems such as insufficient feeding, achieve the effect of improving feeding capacity, improving feeding efficiency, and ensuring sequential solidification

Active Publication Date: 2021-03-26
QINGDAO RES INST OF BEIHANG UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The present invention aims at the problem of insufficient feeding of large-sized aluminum alloy automobile wheels in the low-pressure casting process, and proposes a casting method for improving the mechanical properties of large-sized aluminum alloy automobile wheels. The casting method adopts a large gradient in the direction from the wheel core to the spokes. Cooling design and pressurized feeding combined with solidification path of castings

Method used

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  • A casting method for improving the mechanical properties of large-size aluminum alloy wheels
  • A casting method for improving the mechanical properties of large-size aluminum alloy wheels
  • A casting method for improving the mechanical properties of large-size aluminum alloy wheels

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Embodiment 1

[0034] Example 1: A casting method for improving the mechanical properties of large-sized aluminum alloy automobile wheels

[0035] The implementation object is a 20-inch automobile wheel, the material is A356.2 alloy, and the composition range is shown in Table 1. Common defects in the production of this wheel by conventional low-pressure casting are spoke defects and "R" corner defects. The spoke defects are mainly due to the thin wall thickness of the spokes of this type of wheel. When the temperature field of the mold is not controlled properly, the thin areas of the spokes will solidify first, and the center of the thin areas will solidify later due to the lack of aluminum liquid feed shrinkage and porosity. . The "R" corner defect mainly occurs at the junction of the spoke and the rim, where the thermal joint is thick and is the area where the thickness of the casting transitions, and this part often forms shrinkage cavity defects due to lack of feeding.

[0036] Table...

Embodiment 2

[0053] Example 2: A casting method for improving the mechanical properties of large-size aluminum alloy automobile wheels

[0054] The implementation object is a 20-inch automobile wheel, the material is A356.2 alloy, and the composition range is shown in Table 1. Common defects in the production of this type of wheel by traditional low-pressure casting are similar to those in Example 1, mainly wheel spoke defects and "R" corner defects.

[0055] According to the method of the present invention, the wheel described in embodiment 2 is trial-manufactured, and the cooling layout of the wheel mold is shown in the appendix image 3 As shown, the specific usage is as follows:

[0056] Pre-treatment: A356.2 aluminum ingots are melted, refined (refined and deteriorated), degassed, the composition of the molten aluminum meets the range in Table 1, and the density is 2.61g / cm 3 ; After the mold is sandblasted and sprayed with paint, it is heated to 365°C and then put on the machine. ...

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Abstract

The invention discloses a casting method for improving the mechanical property of a large-size aluminum alloy wheel. The casting method is characterized by comprising the following steps that in the liquid lifting stage, aluminum liquid in a heat preservation furnace is lifted to the position near a sprue of a wheel mold; air cooling of the position, close to an inner rim, of an upper mold of thewheel mold is opened; a mold cavity is stably filled with aluminum liquid near the sprue in a mold filling stage; water cooling of the position, close to an outer rim, of a side mold of the wheel moldis opened; a rapid supercharging mode is adopted in a supercharging stage; pressure is maintained; when the solidification front edge is pushed to a spoke area of the wheel mold, water cooling and air cooling of the position, close to a spoke, of the upper mold are opened; cooling water at a diversion cone is opened; after the spoke portion completes solidification, water cooling at the position,close to a wheel boss, of a lower mold of a road mold is opened; and cooling is carried out, the mold is opened, and a casting is ejected out. Common R corner defects in low-pressure cast wheels canbe effectively eliminated, the mechanical properties of two key parts comprising the wheel boss and the spoke are remarkably improved, and the casting method is particularly suitable for producing large-size aluminum alloy wheels.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy casting, and specifically relates to a casting method for improving the mechanical properties of large-size aluminum alloy wheels, more particularly, a casting method that can greatly improve the aluminum alloy wheels, especially the large-size aluminum alloy wheel core and Method for mechanical properties of spoke parts. Background technique [0002] Automobile wheels are very important bearing parts and safety parts, which directly affect the handling, braking, stability and comfort of the vehicle. The service environment of the wheel requires it to have high bearing capacity, high fatigue, high precision and low weight. In the past, car wheels were mostly made of steel materials, but now with the continuous acceleration of the lightweight process of cars, and the advantages of aluminum alloy wheels in terms of dimensional accuracy, heat dissipation, vehicle safety, and style, aluminum w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D18/04B22D18/08C22C21/02
CPCB22D18/04B22D18/08C22C21/02
Inventor 宋炜范震张花蕊张虎
Owner QINGDAO RES INST OF BEIHANG UNIV
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