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Extrusion casting process for making automobile engine rack of magnesium alloy

A technology for automobile engines and engine brackets, which is applied in the field of alloy manufacturing to achieve the effects of performance enhancement, material structure refinement, and low consumption

Inactive Publication Date: 2007-01-03
鄂尔多斯市天旭轻合金有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, magnesium alloy squeeze casting method is used to prepare automobile engine bracket products, and there is no public report at home and abroad.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Prepare the following alloy composition by weight percentage: 6% Al, 0.17-0.4% Mn, 0.45-0.9% Zn, 0-0.5% RE, the rest is Mg, the total amount of the alloy is 200 kg, and the alloy ingot is preheated in an oven to 200 ℃, the refining agent is dried in a holding furnace at 160 ℃. Preheat the resistance melting furnace to 200°C, sprinkle a layer of covering agent on the bottom of the crucible, add the preheated alloy ingot, adjust the thermocouple to heat step by step, and when the temperature in the furnace rises to 400°C, start to feed the Mix dry air with 1vol.% R32 inhibitor (the protective gas flow rate is 3% / min of the closed volume of the crucible) to prevent the magnesium alloy from burning. After the alloy is completely melted, continue to heat up to 720-730°C and add 0.5wt% modifier Carry out metamorphic refining treatment for 10 minutes, then raise the temperature to 740°C, add refining agent (the amount of refining agent accounts for 2.5% of the total magnesium ...

Embodiment 2

[0025]Prepare the alloy composition in the following weight percentages: 7% Al, 0.17-0.4% Mn, 0.45-0.9% Zn, 0-0.5% RE, the rest is Mg, the total amount of alloy is 300 kg, and the alloy ingot is preheated in an oven to 200 ℃, the refining agent is dried in a holding furnace at 160 ℃. Preheat the resistance melting furnace to 200°C, sprinkle a layer of covering agent on the bottom of the crucible, add the preheated alloy ingots, adjust the thermocouple to heat step by step, and when the temperature in the furnace rises to 400°C, start to feed 1 vol. % inhibitor R152a mixed with dry air (the flow rate of the protective gas is 1-10% / min of the closed volume of the crucible) to prevent the magnesium alloy from burning. After the alloy is completely melted, continue to heat up to 720-730°C and add 0.3wt% modifier Carry out modification and refining treatment for 10 minutes, then raise the temperature to 740-750°C, add refining agent (the amount of refining agent accounts for 2.0% o...

Embodiment 3

[0031] Prepare the following alloy composition by weight percentage: 8% Al, 0.17-0.4% Mn, 0.45-0.9% Zn, 0-0.5% RE, the rest is Mg, the total amount of alloy is 300 kg, and the alloy ingot is preheated in an oven to 200 ℃, the refining agent is dried in a holding furnace at 160 ℃. Preheat the resistance melting furnace to 200°C, sprinkle a layer of covering agent on the bottom of the crucible, add the preheated alloy ingots, adjust the thermocouple to heat step by step, and when the temperature in the furnace rises to 400°C, start to feed 1 vol. % SF6 inhibitor mixed with dry air (the protective gas flow rate is 5% / min of the closed volume of the crucible) to prevent the magnesium alloy from burning. Chemical treatment for 10 minutes, then heat up to 740-750°C, add refining agent (the amount of refining agent accounted for 2.0% of the total magnesium solution) for refining treatment, the refining time is 10 minutes, after the refining is completed, remove the slag, and the surf...

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Abstract

The extrusion casting process for making automobile engine rack of magnesium alloy includes designing magnesium alloy composition, smelting and modifying magnesium alloy, quantitatively casting alloy liquid, indirect extrusion casting and heat treating casting. The metal materials Mg, Al, Mn, Zn, RE, etc in certain weight proportion are compounded, molten in crucible furnace, refined and modified; the alloy liquid is then conveyed through a quantitatively casting pump to an extrusion casting machine, pushed into the mold and pressurized with the punching head, so as to form extrusion cast automobile engine rack of magnesium alloy; and the rack is finally solid solution ageing treated to obtain the rack with excellent mechanical performance. The automobile engine rack of magnesium alloy has reduced weight, fined material structure and raised comprehensive performance.

Description

technical field [0001] The invention relates to a method for preparing a magnesium alloy automobile engine bracket by squeeze casting. Magnesium alloy is used as a material. After smelting, modification and refinement, and refining treatment, squeeze casting and heat treatment of the casting are carried out to obtain a magnesium alloy with superior mechanical properties. Car engine mount. It belongs to the technical field of alloy manufacturing. Background technique [0002] In order to save energy and reduce consumption, reduce exhaust emissions, improve driving comfort and vehicle mechanical properties, cars are now developing in the direction of lightweight. From the perspective of structural materials, the main means to achieve vehicle lightweight is to replace traditional materials with lightweight materials with high specific performance. Magnesium alloy is the lightest metal structure material, which has the characteristics of low price, high specific performance (s...

Claims

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Application Information

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IPC IPC(8): B22D17/02B22D18/02B21C33/02
Inventor 彭立明曾小勤杨艳玲丁文江刘六法丁怀新
Owner 鄂尔多斯市天旭轻合金有限责任公司
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