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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 fine grain size, improved comprehensive performance, high yield strength and elongation

Inactive Publication Date: 2007-11-21
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 alloy is 200 kg, and the alloy ingot is preheated to 200 in an oven ℃, the refining agent is dried in a 160℃ holding furnace. 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 pass the content of 0.1~ 1vol.% R32 inhibitor mixed with dry air (protective gas flow rate is 3% / min of the closed volume of the crucible) to prevent magnesium alloy from burning. After the alloy is completely melted, continue to heat up to 720~730℃, and add 0.5wt% modifier Carry out modification and refinement treatment for 10 minutes, then heat to 740℃, add refining agent (the amount of refining agent accounts for 2.5% of the total magnesium liquid volume) for refi...

Embodiment 2

[0024]Prepare the following alloy components by weight percentage: 7% Al, 0.17-0.4% Mn, 0.45-0.9% Zn, 0-0.5% RE, the rest is Mg, the total alloy is 300 kg, and the alloy ingot is preheated to 200 in an oven ℃, the refining agent is dried in a 160℃ holding furnace. 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 pass in 1vol. % Inhibitor R152a mixed with dry air (protective gas flow rate is 1-10% / min of the closed volume of the crucible) to prevent magnesium alloy from burning. After the alloy is completely melted, continue to heat up to 720-730℃, and add 0.3wt% modifier Carry out modification and refinement treatment for 10 minutes, then heat to 740~750℃, add refining agent (the amount of refining agent accounts for 2.0% of the total magnesium liquid volume) for refining trea...

Embodiment 3

[0030] Prepare the following alloy components 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 alloy is 300 kg, and the alloy ingot is preheated to 200 in an oven ℃, the refining agent is dried in a 160℃ holding furnace. 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 pass in 1vol. % SF6 inhibitor mixed with dry air (protective gas flow rate is 5% / min of the enclosed volume of the crucible) to prevent the magnesium alloy from burning. After the alloy is completely melted, continue to heat up to 720~730℃, and add 1wt% modifier for fine modification. Chemical treatment for 10 minutes, and then heated to 740 ~ 750 ℃, adding refining agent (the amount of refining agent accounts for 2.0% of the total magnesium liquid volume) for refinin...

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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 extrusion casting, and 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 performance, automobiles are now being developed in the direction of lightweight. From the perspective of structural materials, the main means to achieve lightweight vehicles is to replace traditional materials with lightweight materials with high specific performance. Magnesium alloy is the lightest metal structural material, which has the characteristics of low price, high specific performance (specific strength and specific rigidity), and outstanding damping and vibration reduction performance. The use of magnesium alloys in automobile structures can reduce vehicle weight and fuel consumption, reduce vehicle vibration and noise, and imp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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