Defect control method in solidification of molten aluminum alloy

A technology of aluminum alloys and control methods, applied in the field of aluminum-based alloys, can solve the problems of reducing the bearing capacity of aluminum alloys, unfavorable quality of aluminum alloy castings, poor control level, etc., and achieve the goal of improving mechanical properties and scope of application, and reducing solidification defects Probability, the effect of reducing the possibility of shrinkage

Inactive Publication Date: 2017-06-27
泉州市中知信息科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the molten aluminum is cast in the metal mold, due to the unreasonable mold design, it is prone to insufficient pouring, which makes the shape of the casting incomplete; after casting, during the solidification process of the casting, due to insufficient feeding and the influence of the solidification sequence , in the formed castings, it is easy to have obvious shrinkage porosity in the middle and widely distributed shrinkage cavities, resulting in defective products; and in the process of forming normal temperature aluminum alloy castings from the high temperature molten aluminum solidification, due to the huge temperature difference, the castings Considerable structural thermal stress remains, which is easy to form thermal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A defect control method during solidification of molten aluminum alloys, comprising a melting process control method and a solidification heat preservation control method; wherein, the melting process control method includes a gas content control method in molten aluminum and a slag inclusion control method; the solidification heat preservation control method includes a riser A feeding method, a sequential solidification method and a crack control method; specifically comprising the following steps:

[0026] Step S1, gas content control method: use a reverberatory furnace to heat the aluminum alloy to 660°C and melt it into liquid alloy aluminum liquid I; according to the volume ratio of 4.5:2.8:2.2:1.5:0.8, flow Ar at a flow rate of 10L / min , Ne, N 2 , CO, Cl 2 The mixed gas is formed for 25 minutes, and the impurity gas in the liquid alloy aluminum liquid I is removed to obtain the liquid phase alloy aluminum liquid II; wherein, the oxygen content in the mixed gas is...

Embodiment 2

[0033] A defect control method during solidification of molten aluminum alloys, comprising a melting process control method and a solidification heat preservation control method; wherein, the melting process control method includes a gas content control method in molten aluminum and a slag inclusion control method; the solidification heat preservation control method includes a riser A feeding method, a sequential solidification method and a crack control method; specifically comprising the following steps:

[0034] Step S1, gas content control method: use a reverberatory furnace to heat the aluminum alloy to 700°C and melt it into a liquid phase alloy aluminum liquid I; according to the volume ratio of 5.5:3.4:2.6:2:1:1.2, pass through it at a flow rate of 20L / min Into Ar, Ne, N 2 , CO, Cl 2 The mixed gas is formed for 40 minutes, and the impurity gas in the liquid alloy aluminum liquid I is removed to obtain the liquid phase alloy aluminum liquid II; wherein, the oxygen cont...

Embodiment 3

[0041] A defect control method during solidification of molten aluminum alloys, comprising a melting process control method and a solidification heat preservation control method; wherein, the melting process control method includes a gas content control method in molten aluminum and a slag inclusion control method; the solidification heat preservation control method includes a riser A feeding method, a sequential solidification method and a crack control method; specifically comprising the following steps:

[0042] Step S1, gas content control method: use a reverberatory furnace to heat the aluminum alloy to 680°C and melt it into liquid alloy aluminum liquid I; according to the volume ratio of 5:3.1:2.4:1.8:1.0, flow Ar at a flow rate of 15L / min , Ne, N 2 , CO, Cl 2 The mixed gas is formed for 32 minutes, and the impurity gas in the liquid alloy aluminum liquid I is removed to obtain the liquid phase alloy aluminum liquid II; wherein, the oxygen content in the mixed gas is 0...

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Abstract

The invention discloses a defect control method in solidification of a molten aluminum alloy. The defect control method consists of a melting process control method and a solidification insulation control method, wherein the melting process control method includes a molten aluminum gas content control method and a slag inclusion control method; and the solidification insulation control method includes a riser feeding method, a sequential solidification method and a crack control method. The defect control method comprehensively uses gas and slag removal, riser feeding, sequential solidification and aging treatment methods, can effectively reduce the solidification defect probability in cast aluminum alloy, improves the mechanical performances of the cast aluminum alloy, and widens the application range of the cast aluminum alloy.

Description

technical field [0001] The invention relates to the field of aluminum-based alloys, in particular to a defect control method during solidification of molten aluminum alloys. Background technique [0002] Casting is one of the most important methods of manufacturing aluminum alloys. Casting aluminum alloy includes two major steps: smelting of charge and casting of molten aluminum. Among them, the most important process and technology control means during furnace charge smelting can be summarized as: removal and control of dissolved hydrogen and impurity gases, control of molten aluminum refining and effective control of oxide inclusions. The most important process of molten aluminum casting includes: casting control technology, solidification defect control technology and thermal stress control technology. [0003] Due to the high chemical reactivity of aluminum with hydrogen and oxygen, it is easy to dissolve part of hydrogen in molten aluminum and oxidize to form alumina ...

Claims

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Application Information

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IPC IPC(8): C22B9/05C22B9/10C22B21/06B22C9/06C22F1/04C22C1/06B22D27/04B22C9/08
CPCC22B9/05B22C9/065B22C9/088B22D27/04C22B9/10C22B21/062C22B21/064C22C1/06C22F1/04
Inventor 洪铮铮
Owner 泉州市中知信息科技有限公司
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