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Low-pressure casting method for thin-walled aluminum alloy parts

A low-pressure casting, aluminum alloy technology, applied in the field of aluminum casting, can solve the problem of difficult to meet the tensile and deformation resistance of thin-walled aluminum parts

Active Publication Date: 2017-05-17
佛山市顺德区甲坚金属制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the mechanical properties of castings can be improved in the process of low-pressure casting, it is still difficult to meet the mechanical properties of tensile and deformation resistance of thin-walled aluminum parts in complex and changeable environments during air transportation.

Method used

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  • Low-pressure casting method for thin-walled aluminum alloy parts
  • Low-pressure casting method for thin-walled aluminum alloy parts
  • Low-pressure casting method for thin-walled aluminum alloy parts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0011] The first step is to apply heat-conducting lubricating paint on the inner wall of the mold cavity and the riser:

[0012] Spray the thermal conductive paint colloid on the inner wall of the mold cavity and the liquid riser first, and then spray zinc oxide,

[0013] The riser pipe connects the mold cavity with the melting furnace;

[0014] The second step is to preheat the mold cavity and melt the aluminum alloy:

[0015] Use thermocouples to heat the mold, and control the temperature of the mold cavity at 250-350°C,

[0016] First use the melting furnace to heat and melt the 7A55 aluminum alloy. After the alloy is completely melted, then raise the melt temperature to 680-700°C to remove the slag on the surface, and finally raise the melt temperature to 710-720°C for the aluminum alloy melt to refine

[0017] The third step is gas replacement in the smelting furnace:

[0018] Introduce helium gas with a pressure of 0.01MPa into the melting furnace through the gas flo...

Embodiment 1

[0031] In Example 1, the mechanical properties of the thin-walled aluminum alloy casting obtained by controlling the mold cavity temperature at 255° C. in the second step and controlling the pouring pressure difference in the sixth step at 0.025 MPa in the above embodiment are as follows.

[0032]

Embodiment 2

[0033] In Example 2, the mechanical properties of the thin-walled aluminum alloy casting obtained by controlling the mold cavity temperature at 298° C. in the second step and controlling the pouring pressure difference in the sixth step at 0.03 MPa in the above embodiment are as follows.

[0034]

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PUM

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Abstract

The invention discloses a low-pressure casting method of a thin-wall aluminum alloy part, and relates to the field of low-pressure metal casting. The method comprises the following steps: 1, coating a heat conducting lubricating paint on the inner walls of a mold cavity and a riser tube; 2, preheating the mold cavity and melting aluminum alloy; 3, performing gas replacement in a smelting furnace; 4, adding strontium salt; 5, deteriorating and removing impurities; 6, pouring under low pressure; 7, maintaining pressure and cooling after the pouring is finished; 8, performing bipolar homogenization treatment; 9, cooling, opening the mold and taking the part. A thin-wall aluminum alloy casting finished by the method can adapt to the complex and variable environments in aviation flight and meets the requirement on the mechanical property of the thin-wall casting in the aviation flight.

Description

technical field [0001] The invention relates to a casting method for aluminum parts, in particular to a low-pressure casting method for thin-walled aluminum alloy parts. Background technique [0002] In the field of modern aerospace and aviation, there are more and more demands for complex thin-walled lightweight structural parts, especially for the lip of the air intake port and the vertical tail of the aircraft. The commonly used methods are casting metallurgy, which is divided into pressure casting and low-pressure casting. Pressure casting is to fill liquid or semi-liquid metal into the mold cavity at a high speed under high pressure, and under pressure The required castings are obtained by solidification. At present, nearly 90% of aluminum alloy parts are pressure castings. First of all, pressure castings are filled with liquid metal at a high speed and the flow state is unstable. heat treatment; secondly, die-casting is more difficult for complex concave castings; fin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D18/04
Inventor 唐昌兵
Owner 佛山市顺德区甲坚金属制品有限公司
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