CN103014463B - Processing method of anti-fatigue aluminum alloy foaming die cast - Google Patents

Abstract

The invention discloses a processing method of an anti-fatigue aluminum alloy foaming die cast. The processing method comprises the four steps of compounding, smelting, pouring, and thermal treatment. According to the invention, an appropriate amount of rare earth elements La, Ce and Y are added to the aluminum alloy, so that the hydrogen content in the alloy and the alloy yielding anisotropy can be reduced, the alloy plasticity and the anti-fatigue property of the alloy are obviously increased, and at the same time the wear resistance, thermal resistance and high-temperature strength of the alloy can also be improved. The processed aluminum alloy refrigerator foaming die cast has the advantages of good mechanical properties, high strength, good thermal resistance, good usability, good internal structure compactness, no pore and peeling defects, good wear resistance, good corrosion resistance and oxidation resistance, small expansion coefficient and the like.

Description

The complete processing of antifatigue aluminium alloy foaming mould foundry goods

Technical field

The complete processing that the present invention relates to a kind of antifatigue aluminium alloy foaming mould foundry goods, belongs to aluminum alloy materials processing technique field.

Background technology

?an important mould of the manufacture that refrigerator foaming mould is produced as refrigerator, the quality of its processing and manufacturing, will be directly connected to the quality of whole product, even can affect the success or failure that whole product is manufactured.The material that can be used as at present refrigerator foaming mould has metal and nonmetal two classes, and the foaming mould that adopts metal to manufacture can apply in enormous quantities and high-speed production undoubtedly, and foaming mould metallic substance has aluminium, copper, low melting point alloy, nickel, iron, zinc alloy etc.The foaming mould that wherein aluminium alloy is manufactured is most widely used general, and it has good heat conductivity, easily regulates die temperature, be difficult for getting rusty and being corroded, easily maintenance, keeping, cheap, manufacture the advantages such as time period.But aluminium alloy foaming mould also exists the shortcomings such as matter is soft, intensity is low, dense internal organization is poor, therefore, be badly in need of a kind of high performance aluminium alloy refrigerator foaming mould of research and development.

Summary of the invention

The object of the invention is to for the deficiencies in the prior art, a kind of complete processing of antifatigue aluminium alloy foaming mould foundry goods is provided, improve the over-all properties of aluminium alloy refrigerator foaming mould.

The technical solution used in the present invention is as follows:

The complete processing of high heat-resisting aluminium alloy foaming mould, comprises the following steps:

(1) batching

Meet following requirement according to element mass percent: Si≤0.5%, Fe≤0.5%, Cu 3.6-4.5%, Mn 0.40-0.8%, Mg 1.2-1.6%, Cr≤0.1%, Zn≤0.25%, Ti≤0.15%, La 0.04-0.06%, Ce 0.05-0.08%, Y 0.03-0.04%, all the other are that other impurity elements of Al add up to≤0.15%, all the other are Al, prepare burden;

(2) melting

Batching is dropped into successively and in smelting furnace, carries out melting, in stove, be controlled at 720-750 ℃, feed intake after 30-50min, there is aluminium water in stove time, add insulating covering agent to cover, start to stir, add refining agent through refining, skimming obtains, after qualified composition, aluminium liquid being injected to holding furnace from smelting furnace, furnace temperature under 710-730 ℃ of condition leave standstill keep 20-30min, then utilize argon gas to take the hydrogen in aluminium liquid and fine impurities to surface, thereby reduce the hydrogen richness in aluminium liquid;

(3) casting

Aluminium liquid enters crystallizer by the relief hole of smelting furnace through aluminium groove, casts out needed foundry goods, and casting temp is controlled at 670-720 ℃, casting speed control 36-42mm/min, and cooling water flow is controlled at 1050-1250 l/min;

(4) thermal treatment

Foundry goods is carried out after surface treatment, carry out homogenizing annealing processing, detailed process is as follows: be first warming up at 320-340 ℃, insulation 2-3h, a 70-90 per hour ℃ intensification is heated to be incubated 6-8h at 540-560 ℃, then air cooling, then a 60-80 per hour ℃ intensification is heated to 350-380 ℃, and degree of insulation 5-6h; Be cooled at 150-170 ℃ again and be incubated 3-4h, air cooling is to room temperature.

Described insulating covering agent is the mixture of the attapulgite of 40-50% and the borax of 50-60% composition; Described refining agent is made by following raw materials in part by weight: sodium-chlor 5-8, Calcium Fluoride (Fluorspan) 3-5, salt of wormwood 3-5, Graphite Powder 99 5-8, Sodium Silicofluoride 8-10, magnesium oxide 5-8, sepiolite 8-10, trees ash 5-8, NaBF ₄8-10, NaF 5-8;

Described refining agent preparation method is as follows:

A, by 10-15% salt acid soak 3-4 hour for the sepiolite of above-mentioned weight part, deionized water wash, then soak 3-4 hour with 10-12% sodium hydroxide solution, then with deionized water wash to neutral, then at 500-530 ℃, calcine 2-3 hour, be ground into nanometer powder;

B, by after the each heating raw materials melting beyond sepiolite, clarification 1-2 hour, is poured into water cold quenching by clear liquor above, obtains broken particle;

C, the mixing of materials that step a, b are obtained stir and obtain described refining agent.

Beneficial effect of the present invention:

In aluminium alloy of the present invention, add appropriate rare earth element La and Ce, Y, can reduce the anisotropy of hydrogen content in alloy and alloy surrender, obviously improved alloy plasticity and fatigue performance, also can put forward heavy alloyed antiwear heat resisting and hot strength simultaneously.The aluminium alloy refrigerator foaming mould cast that the present invention processes has good mechanical property, intensity high, and good heat resistance, workability are good, and dense internal organization is good, there is not pore and peeling defect, wear resistance is good, corrosion resistance, good in oxidation resistance, the advantage such as the coefficient of expansion is little.

embodiment

The complete processing of antifatigue aluminium alloy foaming mould foundry goods, comprises the following steps:

(1) batching

Meet following requirement according to element mass percent: Si≤0.5%, Fe≤0.5%, Cu 3.6-4.5%, Mn 0.40-0.8%, Mg 1.2-1.6%, Cr≤0.1%, Zn≤0.25%, Ti≤0.15%, La 0.04-0.06%, Ce 0.05-0.08%, Y 0.03-0.04%, other impurity elements add up to≤0.15%, all the other are Al, prepare burden;

(2) melting

Batching is dropped into successively and in smelting furnace, carries out melting, in stove, be controlled at 735 ℃, feed intake after 50min, there is aluminium water in stove time, add insulating covering agent to cover, start stir, after adjusting component, add refining agent through refining, skimming obtains after qualified composition, aluminium liquid is injected to holding furnace from smelting furnace, furnace temperature leaves standstill and keeps 30min under 720 ℃ of conditions, then utilizes argon gas to take the hydrogen in aluminium liquid and fine impurities to surface, thereby reduces the hydrogen richness in aluminium liquid;

(3) casting

Aluminium liquid enters crystallizer by the relief hole of smelting furnace through aluminium groove, casts out needed foundry goods, and casting temp is controlled at 710 ℃, casting speed control 40mm/min, and cooling water flow is controlled at 1200 l/min;

(4) thermal treatment

Foundry goods is carried out, after surface treatment, carrying out homogenizing annealing processing, and detailed process is as follows: be first warming up at 330 ℃, insulation 2.5h, 80 ℃ of intensifications per hour are heated to be incubated 7h at 550 ℃, then air cooling, 80 ℃ of intensifications per hour are heated to 380 ℃ again, and degree of insulation 5h; Be cooled at 160 ℃ again and be incubated 4h, air cooling is to room temperature.

The mixture of the attapulgite that wherein, described insulating covering agent is 40% and 60% borax composition; Described refining agent is made by following raw materials in part by weight: 7 parts, sodium-chlor, 4 parts, Calcium Fluoride (Fluorspan), 4 parts, salt of wormwood, 6 parts of Graphite Powder 99s, 8 parts of Sodium Silicofluorides, 7 parts, magnesium oxide, 9 parts of sepiolites, trees ash 6 parts, NaBF ₄8 parts of 9 parts, NaF;

Described refining agent preparation method is as follows:

A, by 15% salt acid soak 3 hours for the sepiolite of above-mentioned weight part, deionized water wash, then soak 4 hours with 10% sodium hydroxide solution, then with deionized water wash to neutral, then at 520 ℃, calcine 2.5 hours, be ground into nanometer powder;

B, by after the each heating raw materials melting beyond sepiolite, clarify 1.5 hours, clear liquor is above poured into water to cold quenching, obtain broken particle;

C, the mixing of materials that step a, b are obtained stir and obtain described refining agent.

Through check, product chemical composition is: Si 0.412%, Fe 0.364%, Cu 4.257%, Mn 0.649%, Mg 1.498%, Cr 0.072%, Zn 0.206%, Ti 0.098%, La 0.053%, Ce 0.066%, Y 0.037%, and other impurity elements add up to 0.114%, all the other are Al; Mechanical property is: tensile strength 442Mpa, 0.2% yield strength 336Mpa, elongation 13%, Young's modulus 66Gpa.

Claims (1)

1. a complete processing for antifatigue aluminium alloy foaming mould foundry goods, is characterized in that comprising the following steps:

(1) batching

Meet following requirement according to element mass percent: Si≤0.5%, Fe≤0.5%, Cu 3.6-4.5%, Mn 0.40-0.8%, Mg 1.2-1.6%, Cr≤0.1%, Zn≤0.25%, Ti≤0.15%, La 0.04-0.06%, Ce 0.05-0.08%, Y 0.03-0.04%, other impurity elements add up to≤0.15%, all the other are Al, prepare burden;

(2) melting

Batching is dropped into successively and in smelting furnace, carries out melting, in stove, be controlled at 720-750 ℃, feed intake after 30-50min, there is aluminium water in stove time, add insulating covering agent to cover, start to stir, add refining agent through refining, skimming obtains, after qualified composition, aluminium liquid being injected to holding furnace from smelting furnace, furnace temperature under 710-730 ℃ of condition leave standstill keep 20-30min, then utilize argon gas to take the hydrogen in aluminium liquid and fine impurities to surface, thereby reduce the hydrogen richness in aluminium liquid;

Described insulating covering agent is the mixture of the attapulgite of 40-50% and the borax of 50-60% composition;

Described refining agent is made by following raw materials in part by weight: sodium-chlor 5-8, Calcium Fluoride (Fluorspan) 3-5, salt of wormwood 3-5, Graphite Powder 99 5-8, Sodium Silicofluoride 8-10, magnesium oxide 5-8, sepiolite 8-10, trees ash 5-8, NaBF ₄8-10, NaF 5-8;

Described refining agent preparation method is as follows:

A, by 10-15% salt acid soak 3-4 hour for the sepiolite of above-mentioned weight part, deionized water wash, then soak 3-4 hour with 10-12% sodium hydroxide solution, then with deionized water wash to neutral, then at 500-530 ℃, calcine 2-3 hour, be ground into nanometer powder;

B, by after the each heating raw materials melting beyond sepiolite, clarification 1-2 hour, is poured into water cold quenching by clear liquor above, obtains broken particle;

C, the mixing of materials that step a, b are obtained stir and obtain described refining agent;

(3) casting

Aluminium liquid enters crystallizer by the relief hole of smelting furnace through aluminium groove, casts out needed foundry goods, and casting temp is controlled at 670-720 ℃, casting speed control 36-42mm/min, and cooling water flow is controlled at 1050-1250 l/min;

(4) thermal treatment

Foundry goods is carried out after surface treatment, carry out homogenizing annealing processing, detailed process is as follows: be first warming up at 320-340 ℃, insulation 2-3h, a 70-90 per hour ℃ intensification is heated to be incubated 6-8h at 540-560 ℃, then air cooling, then a 60-80 per hour ℃ intensification is heated to 350-380 ℃, and degree of insulation 5-6h; Be cooled at 150-170 ℃ again and be incubated 3-4h, air cooling is to room temperature.