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Novel cooling method and device applied to semi-continuous casting of magnesium alloy

A cooling method and cooling device technology, applied in the field of magnesium metal smelting, can solve the problems affecting the quality and safety of magnesium metal smelting, the surface color becomes black, yellow and green, and the surface of magnesium rods is oxidized and corroded, so as to prevent combustion and explosion accidents, Low oxidation corrosion and high bar utilization

Pending Publication Date: 2019-02-22
威海万华镁业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the special activity of magnesium metal, the method of direct cooling by spraying water can easily lead to: first, the magnesium liquid reacts violently with water, resulting in accidents such as combustion or even explosion; second, the magnesium rod encounters water at high temperature A strong chemical reaction will occur, which will cause oxidation and corrosion on the surface of the magnesium rod, resulting in pits and unevenness, and the surface color will turn black, yellow and green, etc.
The above problems have affected the quality and safety of magnesium metal smelting

Method used

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  • Novel cooling method and device applied to semi-continuous casting of magnesium alloy
  • Novel cooling method and device applied to semi-continuous casting of magnesium alloy
  • Novel cooling method and device applied to semi-continuous casting of magnesium alloy

Examples

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Effect test

Embodiment 1

[0042] Such as figure 1 , Figure 4 , Figure 5 , Image 6 , a novel cooling device applied to semi-continuous casting of magnesium alloys, comprising a crystallizer 10 and a dummy head 20 . The crystallizer is installed on the lifting table 13 of a rod pulling machine 12 . The dummy head pulls out the magnesium alloy billet when the lifting table moves down.

[0043] The crystallizer is provided with a primary cooler 11 for primary cooling of the magnesium liquid, and the primary cooler is a primary cooling water jacket. The primary cooling water jacket is provided with an input interface 14 and an output interface 15 . The input interface 14 is connected to a water source, and the water source in this embodiment is normal temperature water extracted from a cooling water pool by a water pump 16 .

[0044] Below the crystallizer is provided a secondary cooler 30 for secondary cooling of the magnesium alloy slab. The secondary cooler is provided with a secondary cooling a...

Embodiment 2

[0052] Such as figure 2 , a new cooling device applied to semi-continuous casting of magnesium alloys. This embodiment is an improvement of the first embodiment.

[0053] In this embodiment, a protective gas storage tank 60 and a protective gas circulation fan 61 are provided. Preconfigured shielding gas is stored in the shielding gas tank. The shielding gas circulation fan circulates the shielding gas through the secondary cooling chamber 31 and the shielding gas storage tank. In this embodiment, the protective gas circulation fan is installed on the pipeline connecting the dry ice cooling chamber 32 and the output port of the protective gas storage tank.

[0054] An exhaust valve 66 is provided at the outlet port 38 of the secondary cooling chamber. Before the work process starts, open the exhaust valve first, start the protective gas circulation fan, and discharge the air in the secondary cooling air chamber.

[0055] In this embodiment, the shielding gas can be recyc...

Embodiment 3

[0057] Such as image 3 , a new cooling device applied to semi-continuous casting of magnesium alloys. This embodiment is an improvement of Embodiment 1 or Embodiment 2.

[0058] In Embodiment 1 or Embodiment 2, the method of cooling the protective gas before secondary cooling is to use dry ice to cool down, but the cooling efficiency of dry ice is low, and it is difficult to greatly cool down a large flow of gas in a short period of time.

[0059] In this embodiment, cooling liquid is used to cool the protective gas, and a refrigerator 40 , a cooling tank 50 , a protective gas storage tank 60 and a protective gas circulation fan 61 are provided. The refrigerant is a liquid that does not freeze at a low temperature, and ethylene glycol solution can be used. Refrigerating equipment is installed on the refrigerator, and the refrigerator cools the refrigerant liquid. After being cooled by the refrigerator, the temperature of the refrigerant can reach -25°C to -20°C. The chill...

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Abstract

The invention relates to a novel cooling method and device applied to semi-continuous casting of magnesium alloy. The novel cooling method comprises the following steps: a, performing primary coolingon liquid magnesium for orderly condensation; and b, orderly pulling the condensed liquid magnesium downwards, and performing secondary cooling to form a casting blank. In the step b, a protective gasis adopted to perform secondary cooling and is cooled down. The novel cooling device comprises a crystallizer and a dummy bar head, wherein a secondary cooler for secondary cooling of a magnesium alloy casting blank is arranged below the crystallizer and provided with a secondary cooling gas cavity which surrounds the dummy bar head and allows the protective gas to be pumped therein. The novel cooling method and device have the following beneficial effects: since the protective gas is adopted to perform secondary cooling on the magnesium alloy casting blank, the casting blank is prevented from oxidation corrosion; the protective gas is cooled down, so that the magnesium alloy casting blank can be quickly cooled down; the quality of the magnesium alloy casting blank can be remarkably improved; and meanwhile, combustion and explosion accidents can be prevented.

Description

technical field [0001] The invention belongs to the field of magnesium metal smelting, and in particular relates to a novel cooling method and device for semi-continuous casting of magnesium alloys. Background technique [0002] Semi-continuous casting technology is widely used in the rod-making process of the magnesium alloy industry. The specific process is: after the molten magnesium (actually the molten magnesium alloy, usually called molten magnesium or molten magnesium) is condensed into a semi-solidified state through a crystallizer Pull it out from below, and then continue to spray water to cool it to make a billet with a certain cross-sectional shape and a certain length. During the casting process, a certain tensile stress is applied mechanically and a rapid condensation process is adopted, so that the finished product has better mechanical properties than conventional casting. However, due to the special activity of magnesium metal, the method of direct cooling b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/055B22D11/124
CPCB22D11/055B22D11/1245
Inventor 候冰洋邢志功
Owner 威海万华镁业有限公司
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