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A die-casting process of magnesium-aluminum-zinc alloy

A die-casting process, magnesium-aluminum-zinc technology, applied in the field of foundry industry, can solve the problems of shrinkage porosity, thermal cracking, etc., achieve the effect of reducing shrinkage, reasonable process steps, and eliminating thermal cracking

Inactive Publication Date: 2016-08-24
深圳华晔美合金科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existence of these impurities has become the main defect of magnesium alloys: the source of shrinkage pores and hot cracks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In this embodiment, a magnesium-aluminum-zinc alloy die-casting process includes the following steps:

[0021] (1) Alloy smelting: Preheat the melting furnace to 200°C, add zinc, add aluminum after the zinc is completely melted, keep the temperature at 720°C, add magnesium after the aluminum is completely melted, and feed nitrogen after the magnesium is completely melted, Add refining agent simultaneously, refining 15min obtains molten alloy; Wherein, the percentage by weight of aluminum, zinc and magnesium is respectively: 4%, 8% and 88%; The percentage by weight content of iron, copper and silicon in the molten alloy respectively Less than 0.005%, 0.008% and 0.004%; Among them, the amount of refining agent added is 0.9% of the weight of the alloy melt. The feeding amount of nitrogen is 7% of the weight of the alloy melt, and the ventilation time is 20min.

[0022] (2) Die-casting: After the die-casting machine is closed, the molten alloy at a temperature of 700°C is ...

Embodiment 2

[0026] In this embodiment, a magnesium-aluminum-zinc alloy die-casting process includes the following steps:

[0027] (1) Alloy smelting: Preheat the melting furnace to 300°C, add zinc, add aluminum after the zinc is completely melted, keep the temperature at 680°C, add magnesium after the aluminum is completely melted, and feed nitrogen after the magnesium is completely melted, Add refining agent at the same time, refine 10min to obtain alloy melt; Wherein, the weight percent of aluminum, zinc and magnesium are respectively: 3%, 6% and 91%; The weight percent content of iron, copper and silicon in the alloy melt is less than 0.005 respectively %, 0.008% and 0.004%; among them, the amount of refining agent added is 0.6-0.9% of the weight of the alloy melt, the amount of nitrogen gas is 5-7% of the weight of the alloy melt, and the aeration time is 20min

[0028] (2) Die-casting: After the die-casting machine closes the mold, fill the alloy melt with a temperature of 680°C into...

Embodiment 3

[0032] In this embodiment, a magnesium-aluminum-zinc alloy die-casting process includes the following steps:

[0033] (1) Alloy smelting: Preheat the melting furnace to 300°C, add zinc, add aluminum after the zinc is completely melted, keep the temperature at 720°C, add magnesium after the aluminum is completely melted, and feed nitrogen after the magnesium is completely melted, Adding refining agent at the same time, refining for 15 minutes to obtain molten alloy; wherein, the weight percentages of aluminum, zinc and magnesium are respectively: 4%, 8% and 88%; wherein, the addition amount of refining agent is 0.8% of the weight of alloy molten , the amount of nitrogen feed is 6% of the weight of the alloy melt, and the aeration time is 20min.

[0034] (2) Die-casting: After the die-casting machine closes the mold, fill the alloy melt with a temperature of 700°C into the cavity at a spray speed of 35m / s. The mold pressure is 13MPa;

[0035] (3) Heat treatment: heat the casti...

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Abstract

The invention discloses a die-casting process of magnesium-aluminum-zinc alloy. The process includes the following steps: (1) Preheat the smelting furnace, add zinc, add aluminum after the zinc is completely melted, keep the temperature at 680-720 ° C, add magnesium after the aluminum is completely melted, and after the magnesium is completely melted, pass Nitrogen gas is added, and refining agent is added to obtain the alloy melt; (2) After the die-casting machine closes the mold, the alloy melt is filled into the cavity, and after the alloy melt fills the cavity, the die-casting machine is die-casting to form a whole; ( 3) Heat the casting to 300-320℃, keep warm; then continue to heat to 650-700℃, keep warm, after oil quenching and cooling, reheat to 300-320℃, keep warm, then continue to heat to 600-650℃, keep warm , rapidly cooled to 300-320 ℃, kept for 40-60min and then cooled naturally.

Description

technical field [0001] The invention relates to a die-casting process of magnesium-aluminum-zinc alloy, which belongs to the technical field of casting industry. Background technique [0002] Magnesium alloys are the most important alloys used in industrial magnesium alloys. Magnesium alloy has the advantages of light weight, shock absorption and noise reduction, anti-electromagnetic radiation, good thermal conductivity, and no environmental pollution caused by recycling. In particular, magnesium resources are particularly rich, and it is known as a lightweight green structural material in the 21st century. Magnesium is the main element in magnesium alloys. Due to the active chemical properties of magnesium, it is easy to generate magnesium oxide and magnesium oxide inclusions; the solubility of hydrogen in magnesium alloys is two orders of magnitude greater than that of aluminum; there are often solvent inclusions and metal inclusions in magnesium alloys Appear. The prese...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/04C22C1/02C22C1/06B22D17/00C22F1/06
Inventor 浦巧生
Owner 深圳华晔美合金科技有限公司
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