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Semicontinuous casting crystallizer for restraining cracking of magnesium alloy ingot blank and use method of semicontinuous casting crystallizer

A technology for casting crystallizers and magnesium alloys, applied in the field of casting, can solve the problems such as insufficient attention paid to a cold condition, and achieve the effects of reasonable methods and equipment, prevention of cracking, and easy control.

Active Publication Date: 2015-12-02
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current semi-continuous casting of magnesium alloys still mainly borrows the method of suppressing cold cracking in aluminum alloy ingot casting from the technical point of view, such as reducing the strength of the secondary cooling water, which is of great importance to the solidification and hot cracking of magnesium alloys. The influence of cold condition control has not attracted enough attention

Method used

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  • Semicontinuous casting crystallizer for restraining cracking of magnesium alloy ingot blank and use method of semicontinuous casting crystallizer
  • Semicontinuous casting crystallizer for restraining cracking of magnesium alloy ingot blank and use method of semicontinuous casting crystallizer
  • Semicontinuous casting crystallizer for restraining cracking of magnesium alloy ingot blank and use method of semicontinuous casting crystallizer

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Semi-continuous casting crystallizer structure for inhibiting cracking of magnesium alloy billets such as figure 1 As shown, including the inner sleeve, insulation layer, cooling water tank, excitation coil and crystallizer shell, the insulation layer is set on the top of the inner wall and the outer wall at the same time; The bottom surface of the top plate is connected, and the height of the outer insulation layer is 50% of the height of the inner sleeve; the insulation layer set above the inner wall is the inner insulation layer, and its top is the same height as the top surface of the inner sleeve, and the height of the inner insulation layer is 50% of the height of the inner sleeve. %; the inner insulation layer is embedded in the inner sleeve and bonded to the inner wall, and the embedding depth is 20% of the thickness of the side wall of the inner sleeve; the outer insulation layer is embedded in the inner sleeve and bonded to the outer wall of the inner sleeve, a...

Embodiment 2

[0063] The structure of the semi-continuous casting crystallizer that suppresses the cracking of the magnesium alloy billet is the same as in Example 1, the difference is that:

[0064] (1) The insulation layer is set above the outer wall and is the outer insulation layer; the height of the outer insulation layer is 80% of the height of the inner sleeve; the embedding depth of the outer insulation layer is 40% of the thickness of the side wall of the inner sleeve;

[0065] (2) The inner sleeve is made of stainless steel;

[0066] (3) The material of the inner insulation layer is ceramic fiber paper, and the side of the ceramic fiber paper surface contacting the melt is coated with boron carbide paint;

[0067] (4) The inner surface of the inner insulation layer extends 8mm from the inner wall surface of the inner sleeve; the transition zone is made of a mixture of fatty acid glycerides and talcum powder at a weight ratio of 1:2; the angle between the inclined side of the trans...

Embodiment 3

[0074]The structure of the semi-continuous casting crystallizer that suppresses the cracking of the magnesium alloy billet is the same as in Example 1, the difference is that:

[0075] (1) The insulation layer is set above the inner wall of the inner sleeve as the inner insulation layer; the height of the inner insulation layer is 80% of the height of the inner sleeve; the embedded depth of the inner insulation layer is 40% of the thickness of the side wall of the inner sleeve;

[0076] (2) The inner sleeve is made of copper alloy;

[0077] (3) The material of the inner insulation layer is ceramic fiber paper, and the side of the ceramic fiber paper surface contacting the melt is coated with molybdenum disulfide coating;

[0078] (4) The inner surface of the inner insulation layer extends 10mm from the surface of the inner wall of the inner sleeve; the transition zone is made of a mixture of fatty acid glycerides and talcum powder at a weight ratio of 1:3; the angle between th...

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Abstract

The invention discloses a semicontinuous casting crystallizer for restraining cracking of a magnesium alloy ingot blank and a use method of the semicontinuous casting crystallizer and belongs to the technical field of casting. The crystallizer comprises an inner sleeve, heat preservation layers, a cooling water tank, a magnet exciting coil and a crystallizer shell. The heat preservation layers are arranged above the inner wall of the inner sleeve or arranged above the outer wall of the inner sleeve or arranged above the inner wall and the outer wall of the inner sleeve at the same time. The inner heat preservation layer is embedded into the inner sleeve and spliced to the inner wall. The outer heat preservation layer is embedded into the inner sleeve and spliced to the outer wall of the inner sleeve. The use method comprises the steps that 1, a dummy ingot is lifted into the crystallizer; 2, cooling water is opened, and the magnet exciting coil is provided with alternating current; 3, magnesium alloy melt is stirred through Lorentz force generated by the magnet exciting coil; and 4, after a stable solidified shell is formed, a casting machine is started, and the ingot blank is pulled out of the crystallizer. The method and crystallizer are reasonable, and the cracking tendency of alloy ingot blanks prone to crack and flat blanks and round blanks of large specifications in the semicontinuous casting process can be effectively lowered.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a semi-continuous casting crystallizer for suppressing cracking of a magnesium alloy billet and a method for using the same. Background technique [0002] Deformation of magnesium alloys is an important aspect of the industrial application of magnesium alloys. Generally speaking, profiles, plates and forgings of magnesium alloys are made of slabs or round billets for deformation through extrusion, rolling or forging, extrusion or plate rolling. Therefore, the preparation of slabs or round billets is the prerequisite for the production of deformed magnesium alloy deformed materials. Direct water-cooled casting (i.e. semi-continuous casting) is a technical method widely used in casting non-ferrous metal ingots; at present, this method is also used in the preparation of wrought magnesium alloy ingots; compared with aluminum, the unit volume of magnesium and its alloys T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/055B22D11/059
Inventor 胡文义乐启炽张志强宝磊柏媛媛
Owner NORTHEASTERN UNIV
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