A method for swirling and blowing refining of low-pressure casting aluminum alloy melt with argon protection

An aluminum alloy melt and argon protection technology, which is applied in the field of argon blowing and refining aluminum alloy melt, can solve the problems of differences in refining effects, etc., and achieve the effects of reducing oxidation slag inclusions and suction, isolating contact, and simple production

Active Publication Date: 2021-03-23
XIAN SUPERCRYSYAL SCI TECH DEV CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The instability of each factor in the aluminum alloy refining process will lead to differences in the refining effect

Method used

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  • A method for swirling and blowing refining of low-pressure casting aluminum alloy melt with argon protection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044]Taking a casting with a size of 560×245×190mm as an example, the material is ZL114A, there are 11 oil pipes in total, there are many bosses, and the shapes are different. The 3D printing sand mold + low-pressure pouring method is adopted, and there are many sand mold blocks. The implemented Specific steps are as follows:

[0045] Step 1: The surface of the aluminum alloy used materials must be dry blasted, and the used materials are baked at 450°C for 1 hour before use.

[0046] Step 2: Add the aluminum alloy material baked in step 1 into the 150Kg graphite crucible, use a bell jar to cover the mouth of the crucible during the materialization process, and pass argon gas into the aluminum alloy crucible at the center of the upper end of the bell jar. The gas inlet should be 5cm higher than the upper end of the crucible.

[0047] Step 3: Improve the argon cyclone blowing refining device, and improve the structure of the refining device: there are vent holes 2 along the ax...

Embodiment 2

[0058] Taking a casting with a size of 150×130×57mm and an overall wall thickness of 8mm as an example, the material is ZL105, and there are two hydraulic channels in the casting. The specific steps are as follows:

[0059] Step 1: The surface of the aluminum alloy used materials must be dry blasted, and the used materials are baked at 450°C for 1 hour before use.

[0060] Step 2: Add the aluminum alloy material baked in step 1 into the 150Kg graphite crucible, use a bell jar to cover the mouth of the crucible during the materialization process, and pass argon gas into the aluminum alloy crucible at the center of the upper end of the bell jar. The gas inlet should be 5cm higher than the upper end of the crucible.

[0061] Step 3: Improve the argon cyclone blowing refining device, and improve the structure of the refining device: there are vent holes 2 along the axis of the graphite rod 3, and the diameter of the vent hole 2 is 14mm, and there are 9 vent holes evenly distribute...

Embodiment 3

[0072] by size Take a casting with an overall wall thickness of 16mm as an example. The material is ZL114A. The casting is in the shape of a basin with a large curvature and a hollow inner cavity. Its implementation specific steps are as follows:

[0073] Step 1: The surface of the aluminum alloy used materials must be dry blasted, and the used materials are baked at 450°C for 1 hour before use.

[0074] Step 2: Add the aluminum alloy material baked in step 1 into the 150Kg graphite crucible, use a bell jar to cover the mouth of the crucible during the materialization process, and pass argon gas into the aluminum alloy crucible at the center of the upper end of the bell jar. The gas inlet should be 5cm higher than the upper end of the crucible.

[0075] Step 3: Improve the argon cyclone blowing refining device, and improve the structure of the refining device: there are vent holes 2 along the axis of the graphite rod 3, and the diameter of the vent hole 2 is 14mm, and there...

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Abstract

The invention discloses an argon gas protection rotary blowing refining method for low-pressure casting of aluminum alloy melt. The method comprises the following steps that an aluminum alloy materialis melted; a refining device is adopted for carrying out argon gas blowing refining on molten aluminum after melting is finished, and molten aluminum alloy metal is left to stand after refining is finished; and a mold shell model waits to be poured; and a casting is poured by adopting a low-pressure casting device connected with an air compressor through a low-pressure casting process. The problem that the content of the aluminum alloy melt casted by low-pressure casting is large is solved, the density and pressure bearing capacity of the aluminum alloy are improved, the situation that the metallurgical quality is unstable and even scrapping occurs due to the fact that the aluminum alloy melt is large in gas content is avoided, so that the production cost of castings is greatly reduced; and the hydrogen content of every 100 g of a sample after refining is less than 0.1 mL, and the production efficiency is improved while the gas content of the aluminum alloy melt is reduced.

Description

technical field [0001] The invention relates to a low-pressure pouring aluminum alloy melt swirl-blow refining method with argon protection. The method is suitable for low-pressure pouring and uses argon swirl-blow to refine the aluminum alloy melt. Background technique [0002] With the rapid development of the aerospace field, the requirements for the performance of materials and the production efficiency of parts are getting higher and higher. Aluminum alloy parts have been used more and more in recent years because of their light weight, good corrosion resistance, good tensile properties, and easy rapid casting production. In particular, Al-Si alloys have the characteristics of high mechanical properties, easy forming, and excellent volume stability, and have been widely used in various domestic light engines. In recent years, the production of high-performance aluminum alloy castings in China mostly adopts the anti-gravity pouring method. Anti-gravity casting uses exte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02C22B9/05B22D18/04
CPCB22D18/04C22B9/05C22C1/026
Inventor 薛祥义张晓冬何益可周中波杨国娟林琳
Owner XIAN SUPERCRYSYAL SCI TECH DEV CO LTD
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