Method for preparing globular crystal aluminium alloy semi-solid slurry material by low rotary speed transport pipe

A technology of semi-solid slurry and conveying pipe, which is applied in the field of semi-solid slurry of near-spherulite aluminum alloy prepared by low-speed conveying pipe, which can solve the problems of low efficiency, difficulty in billet handling, high electromagnetic stirring power, etc. Short, adaptable, and simple-to-equip effects

Inactive Publication Date: 2008-03-26
NANCHANG UNIV
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Problems solved by technology

Although thixotropy has been successfully applied in industrial production, after years of production practice and in-depth research, it has been found that there are three major process defects in thixotropy: (1) high production cost, high electromagnetic stirring power, low efficiency, High energy consumption, about 40% more cost when preparing semi-solid billets; high energy consumption for remelting heating, serious oxidation of the billet surface, loss of metal accounts

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  • Method for preparing globular crystal aluminium alloy semi-solid slurry material by low rotary speed transport pipe

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Embodiment Construction

[0013] The specific implementation of the slurry preparation process of the present invention will be described below by taking the A356 alloy as an example. As shown in Figure 1, the chemical composition of the alloy is: Si-6.9%, Mg-0.35%, Fe-0.09%, Cu-0.01%, Mn-0.02%, and the rest is Al. The alloy has a liquidus temperature of 615°C and a solidus temperature of 574°C. During the whole pulping process, Ar gas is passed through the melting and holding furnace and the crystallization furnace to protect the aluminum alloy melt. The specific process is as follows:

[0014] (1) The example alloy was melted at a high temperature of 720°C in a melting and holding furnace, and refined for 1 hour; then the alloy melt was cooled to a pouring temperature of 655°C, and kept for 15 minutes to homogenize the temperature and chemical composition of the alloy melt.

[0015] (2) Low temperature pouring. When the alloy melt meets the process requirements, it is poured into the rotating conve...

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Abstract

The present invention relates to a method for preparing near-spherulite aluminium alloy semi-slid slurry by utilizing conveying pipe with low rotating speed. It is characterized by that its preparation method includes the following steps: 1, melting and refining alloy melt; 2, low-temperature pouring stage; and 3, grain growth control stage. The usable aluminium alloy includes deformation aluminium alloy and cast aluminium alloy. The forming process which can be used by the prepared slurry includes rheopectic compression casting, rheopectic extrusion, rheopectic rolling and rheopectic coupling.

Description

technical field [0001] The invention relates to a method for preparing semi-solid slurry of spherulite aluminum alloy, in particular to a method for preparing semi-solid slurry of spherulite aluminum alloy by a low-speed delivery pipe. Background technique [0002] Semi-solid forming technology is recognized as the most promising near-net forming technology for light alloys in the 21st century, including two forming routes of thixoforming and rheoforming. Although thixotropy has been successfully applied in industrial production, after years of production practice and in-depth research, it has been found that there are three major process defects in thixotropy: (1) high production cost, high electromagnetic stirring power, low efficiency, High energy consumption, about 40% more cost when preparing semi-solid billets; high energy consumption for remelting heating, serious oxidation of the billet surface, loss of metal accounts for about 5-12% of the weight of the billet; sawd...

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Application Information

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IPC IPC(8): B22D1/00B22D17/20
Inventor 杨湘杰郭洪民
Owner NANCHANG UNIV
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