Aluminum alloy for casting engine cylinder cover and preparation method of aluminum alloy

An engine cylinder head and aluminum alloy technology, which is applied in the field of aluminum alloy materials, can solve problems such as the inability to meet the design performance requirements of the cylinder head, and achieve the effect of high strength and high toughness

Inactive Publication Date: 2016-11-09
CHONGQING CHANGAN AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

AC4CH is an aluminum alloy material commonly used in engine cylinder heads, and its main components are Si6.5-7.5%, Mg0.25-0.45%, Fe≤0.20%; however, after T6 heat treatment, its tensile strength is >250MPa, el

Method used

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  • Aluminum alloy for casting engine cylinder cover and preparation method of aluminum alloy
  • Aluminum alloy for casting engine cylinder cover and preparation method of aluminum alloy

Examples

Experimental program
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Example Embodiment

[0025] Example 1:

[0026] The first step is to prepare 624Kg of pure aluminum ingots, 49Kg of pure silicon, 2.5Kg of pure magnesium, 23.8Kg of aluminum-titanium master alloy, and 0.7Kg of aluminum-strontium master alloy. The total weight of raw materials is 700Kg.

[0027] In the second step, add the pure aluminum ingot and pure silicon prepared in the first step into the crucible furnace and heat it to 760℃±10℃ to melt;

[0028] In the third step, after the added pure aluminum ingot and pure silicon are all melted, the pure magnesium and aluminum-titanium master alloy prepared in the first step are pressed into the bottom of the aluminum and silicon solution with a bell jar, and the temperature is controlled at 860 Alloying is carried out at around ℃.

[0029] In the fourth step, after the alloying is completed, the temperature is controlled between 740℃±10℃, and the aluminum strontium master alloy AlSr prepared in the first step is added as a modifier;

[0030] In the fifth step, hi...

Example Embodiment

[0034] Example 2:

[0035] The first step is to prepare 612Kg of pure aluminum ingots, 52Kg of pure silicon, 3Kg of pure magnesium, 32Kg of aluminum-titanium master alloy, and 1Kg of aluminum-strontium master alloy. The total weight of raw materials is 700Kg.

[0036] In the second step, add the pure aluminum ingot and pure silicon prepared in the first step into the crucible furnace and heat it to 760℃±10℃ to melt;

[0037] In the third step, after the added pure aluminum ingot and pure silicon are all melted, press the pure magnesium and aluminum-titanium intermediate alloy prepared in the first step into the bottom of the aluminum and silicon solution with a bell jar, and control the temperature at 810 Alloying is carried out at around ℃.

[0038] In the fourth step, after the alloying is completed, the temperature is controlled between 740℃±10℃, and the aluminum strontium master alloy AlSr prepared in the first step is added as a modifier;

[0039] In the fifth step, high-purity ni...

Example Embodiment

[0043] Example 3:

[0044] The first step is to prepare 639.5Kg of pure aluminum ingots, 46Kg of pure silicon, 2Kg of pure magnesium, 12Kg of aluminum-titanium master alloy, and 0.5Kg of aluminum-strontium master alloy. The total weight of raw materials is 700Kg.

[0045] In the second step, add the pure aluminum ingot and pure silicon prepared in the first step to the crucible furnace and heat it to 760±10℃ to melt;

[0046] In the third step, after the added pure aluminum ingot and pure silicon are all melted, press the pure magnesium and aluminum-titanium intermediate alloy prepared in the first step into the bottom of the aluminum and silicon solution with a bell jar, and control the temperature at 840 Alloying is carried out at around ℃.

[0047] In the fourth step, after the alloying is completed, the temperature is controlled between 740℃±10℃, and the aluminum strontium master alloy AlSr prepared in the first step is added as a modifier;

[0048] In the fifth step, high-purity n...

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Abstract

The invention relates to an aluminum alloy for casting an engine cylinder cover. The aluminum alloy is prepared from the following components in percentage by mass: 6.5 to 7.5 percent of Si, 0.25 to 0.45 percent of Mg, less than or equal to 0.17 percent of Fe, 0.08 to 0.25 percent of Ti, 0.005 to 0.015 percent of Sr and the balance of Al. The invention further relates to a preparation method of the aluminum alloy. The preparation method comprises the following steps: preparing the materials according to the above component requirements; heating pure aluminum ingots and pure silicon in a crucible furnace to 760 +/- 10 DEG C to melt the pure aluminum ingots and the pure silicon; pressing a pure magnesium, aluminum and titanium intermediate alloy into the bottom of an aluminum and silicon solution with a bell jar, and controlling the temperature at 810 to 860 DEG C for alloying; after the alloying is completed, controlling the temperature between 740 +/- 10 DEG C, and adding an aluminum-strontium intermediate alloy AlSr; feeding high-purity nitrogen for gas removal; adding a covering agent; performing stewing and drossing; and pouring an alloy solution into a preheating die to obtain the aluminum alloy for casting the engine cylinder cover. After the aluminum alloy is subjected to T6 thermal treatment, the tensile strength of the aluminum alloy is 305 to 325 MPa, the yield strength is 240 to 260 MPa, the hardness is 90 to 110 HBS, and the ductility is up to 6 percent; and the strength and the toughness can meet the performance requirements of an engine cylinder cover product.

Description

technical field [0001] The invention relates to an aluminum alloy material, in particular to an aluminum alloy used for casting an engine cylinder head and a preparation method thereof. Especially aluminum alloy materials with excellent mechanical properties (high strength, high toughness). Background technique [0002] At present, when various companies produce automobile engine cylinder head products, their production equipment such as smelting, casting, and heat treatment differs, and the casting and heat treatment process parameters adopted have their own use systems; The material performance requirements are inconsistent, so the aluminum alloy materials used by various companies are optimized on the basis of general material grades to form special material grades. [0003] With the integrated application of new technologies such as engine TC (turbo charging technology), GDI (gasoline direct injection technology), VVT (engine variable valve timing technology), the struc...

Claims

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Application Information

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IPC IPC(8): C22C1/03C22C1/06C22C21/04
CPCC22C1/026C22C1/03C22C1/06C22C21/04
Inventor 何平项正波高亮李文仲
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD
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