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Casting-rolling process and equipment for magnesium alloy slab

A magnesium alloy, casting and rolling technology, applied in metal processing equipment, metal rolling, metal rolling, etc., can solve the problems of high chemical activity of magnesium alloy solution, unsuitable production of magnesium alloy plate, reaction of magnesium alloy liquid, etc., and achieve improvement Plasticity, improvement of solidification state, and effect of improving the quality of molten magnesium

Inactive Publication Date: 2009-02-25
CHINA NON-FERROUS METALS PROCESSING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] There is no casting and rolling system specially used for the production of magnesium alloy plates at home and abroad, because there are still the following problems in the research of magnesium alloy casting and rolling technology: (1) due to the high chemical activity of magnesium alloy melt, it is easy to oxidize, Combustion, its protection, slag removal and transportation methods in the smelting furnace and launder are completely different from those of aluminum alloys. Therefore, the existing aluminum alloy casting and rolling system is not suitable for the production of magnesium alloy plates; (2) The structural design of the roll sleeve , material selection and roll surface coating lubrication and other issues, since the molten magnesium is in the roll gap of the roll center line, it needs to be cooled and solidified in a short period of time to complete the entire casting crystallization process, followed by rolling forming, in this process A large amount of heat energy of molten magnesium is quickly taken away by the roll, which requires better thermal conductivity of the roll sleeve
Therefore, the roller sleeve material is required to have good high-temperature mechanical properties and cannot react with the magnesium alloy solution; (3) Due to the high chemical activity of the magnesium alloy solution, the existing refractory aluminum silicate materials for aluminum alloy casting and rolling are not suitable for magnesium alloys

Method used

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  • Casting-rolling process and equipment for magnesium alloy slab
  • Casting-rolling process and equipment for magnesium alloy slab

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] After the AZ31 magnesium alloy ingot is preheated, it is put into the 100kg resistance melting furnace 1, and when the temperature reaches 300°C, the mixed gas (SF 6 +CO 2 + air, proportional to SF 6 : 0.1%, CO 2 : 4.9%, dry air: 95%;). When the temperature reaches 500°C, carry out stirring and refining, ventilate and blow slag and let it stand for 10 minutes. Under the protective gas, the magnesium alloy liquid is then transported to the front box 3 through the launder 2, and the front box 3 keeps the magnesium alloy liquid at a constant temperature of 600°C to control the inflow. The magnesium alloy liquid of the casting roll has a relatively constant liquid level, which is 2cm higher than the center line. The magnesium alloy liquid passes through the nozzle 5 at the same temperature and enters the casting machine 6 at a uniform flow rate. The casting temperature is controlled at 500°C under the protective gas , The diameter of the 6 rolls of the casting and rollin...

Embodiment 2

[0033] After the AZ31 magnesium alloy ingot is preheated, it is put into the 550kg resistance melting furnace 1, and when the temperature reaches 400°C, the mixed gas (SF 6 +CO 2 + air, proportional to SF 6 : 0.4%, CO 2 : 20%, dry air: 79.6%;). When the temperature reaches 600°C, carry out stirring and refining, ventilate and blow slag, and let it stand for 20 minutes. Under the protective gas, the magnesium alloy liquid is then transported to the front box 3 through the launder 2, and the front box 3 keeps the magnesium alloy liquid at a constant temperature of 700°C to control the inflow. The magnesium alloy liquid of the casting roll has a relatively constant liquid level, which is 4cm higher than the center line. The magnesium alloy liquid passes through the nozzle 5 at the same temperature and enters the casting machine 6 at a uniform flow rate. The casting temperature is controlled at 600°C under the protective gas , the roll diameter of the cast-rolling machine is 60...

Embodiment 3

[0035] After the AZ31 magnesium alloy ingot is preheated, it is put into the 1000kg resistance melting furnace 1, and when the temperature reaches 500°C, the mixed gas (SF 6 +CO 2 + air, proportional to SF 6 : 1%, CO 2 : 49%, dry air: 50% ;). When the temperature reaches 700°C, carry out stirring and refining, ventilate and blow slag, and let it stand for 30 minutes. Under the protective atmosphere, the magnesium alloy liquid is then transported to the front box 3 through the launder 2, and the front box 3 keeps the magnesium alloy liquid at a constant temperature of 800°C to control the inflow. The magnesium alloy liquid of the casting roll has a relatively constant liquid level, which is 6cm higher than the center line. The magnesium alloy liquid passes through the nozzle 5 at the same temperature and enters the casting machine 6 at a uniform flow rate. The casting temperature is controlled at 700°C under the protective gas , the roll diameter of the cast-rolling machine ...

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Abstract

The present invention relates to a casting-rolling process of magnesium alloy slab and its equipment. Said process includes the following steps: preheating magnesium alloy ingot, smelting said magnesium alloy ingot in smelting furnace with protective gas; transferring the molten magnesium alloy to front tank by means of runner rough, relaining constant temperature in front tank, feeding the molten magnesium alloy into casting-rolling machine by means of lip to make casting and rolling operation, finally using fine rolling machine to make warm-rolling and cold-rolling so as to obtain the finished product plate material with required thickness. Its equipment mainly includes smelting furnace, runner trough, front tank, lip, on-line mixed gas supply device and casting-rolling machine.

Description

technical field [0001] The invention relates to a casting and rolling system for producing magnesium alloy plates, in particular to a casting and rolling process and equipment for producing magnesium alloy plates of various thicknesses. Background technique [0002] With the enhancement of people's awareness of environmental protection and the increasing emphasis on energy, higher requirements are placed on the lightweight and recyclability of products. Due to their superior performance, the application of magnesium alloys is receiving unprecedented attention. my country is a country rich in magnesium resources and a major producer and exporter of primary magnesium in the world. However, most of my country's export products are cheap pure magnesium ingots, and the export proportion of magnesium alloy ingots is only about 15%. The export of magnesium alloy products is even more negligible, and the high-performance magnesium alloy plates and profiles required for military prod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B1/46B21B37/46B22D11/117B22D11/14B21B13/22B21B27/08B21B27/02
Inventor 闫蕴琪窦保杰张慧翁文凭陈琦钟皓
Owner CHINA NON-FERROUS METALS PROCESSING TECH CO LTD
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