CN103014463A - 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 present invention relates to a kind of complete processing of antifatigue aluminium alloy foaming mould foundry goods, belong to the aluminum alloy materials processing technique field.

Background technology

The refrigerator foaming mould is as an important mould of the manufacturing of refrigerator production, and 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 made.The material that can be used as at present the refrigerator foaming mould has metal and nonmetal two classes, and the foaming mould that adopts metal to manufacture can apply to reach in enormous quantities in the high-speed production undoubtedly, and the foaming mould metallic substance has aluminium, copper, low melting point alloy, nickel, iron, zinc alloy etc.Wherein the foaming mould manufactured of aluminium alloy is most widely used general, and it has good heat conductivity, regulates die temperature easily, be difficult for getting rusty and being corroded, easily maintenance, keeping, cheap, manufacture the advantage such as time period.But the aluminium alloy foaming mould also exists the shortcomings such as matter is soft, intensity is low, dense internal organization is poor, therefore, is 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 may further comprise the steps:

(1) batching

Satisfy following requirement: 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% according to the element mass percent, all the other are that other impurity elements of Al add up to≤0.15%, all the other are Al, prepare burden;

(2) melting

To prepare burden to drop into successively and carry out melting in the smelting furnace, be controlled at 720-750 ℃ in the stove, feed intake behind the 30-50min, when treating to occur aluminium water in the stove, add insulating covering agent and cover, begin to stir, add refining agent through refining, skim obtain qualified composition after, aluminium liquid is injected holding furnace from smelting furnace, furnace temperature leaves standstill under 710-730 ℃ of condition and keeps 20-30min, then utilize argon gas to take the hydrogen in the aluminium liquid and fine impurities to surface, thereby reduce the hydrogen richness in the aluminium liquid;

(3) casting

Aluminium liquid enters crystallizer by the relief hole of smelting furnace through the 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

After foundry goods carried out surface treatment, carrying out homogenizing annealing processes, detailed process is as follows: be warming up to first under 320-340 ℃, insulation 2-3h, per hour 70-90 ℃ of intensification is heated to 540-560 ℃ of lower insulation 6-8h, then air cooling, per hour 60-80 ℃ of intensification is heated to 350-380 ℃ again, and insulation degree 5-6h; Be cooled to 150-170 ℃ of lower insulation 3-4h, air cooling to room temperature gets final product again.

Described insulating covering agent is the mixture that the borax of the attapulgite of 40-50% and 50-60% forms; 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, with the sepiolite of above-mentioned weight part with 10-15% salt acid soak 3-4 hour, deionized water wash soaked 3-4 hour with the 10-12% sodium hydroxide solution again, and is extremely neutral with deionized water wash again, then 500-530 ℃ of lower calcining 2-3 hour, be ground into nanometer powder;

B, with after each the heating raw materials melting beyond the sepiolite, clarify 1-2 hour, top clear liquor is poured into water cold quenching, obtain the particle of fragmentation;

C, the mixing of materials stirring that step a, b are obtained namely get described refining agent.

Beneficial effect of the present invention:

Add an amount of rare earth element La and Ce, Y in the aluminium alloy of the present invention, can reduce the anisotropy of hydrogen content in the 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 are not pore and peeling defective, 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 may further comprise the steps:

(1) batching

Satisfy following requirement: 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% according to the element mass percent, other impurity elements add up to≤0.15%, all the other are Al, prepare burden;

(2) melting

To prepare burden to drop into successively and carry out melting in the smelting furnace, be controlled at 735 ℃ in the stove, behind the 50min that feeds intake, when treating to occur aluminium water in the stove, adding insulating covering agent covers, begin to stir, behind the adjusting component, add refining agent through refining, skim obtain qualified composition after, aluminium liquid is injected holding furnace from smelting furnace, furnace temperature leaves standstill under 720 ℃ of conditions and keeps 30min, then utilizes argon gas to take the hydrogen in the aluminium liquid and fine impurities to surface, thereby reduces the hydrogen richness in the aluminium liquid;

(3) casting

Aluminium liquid enters crystallizer by the relief hole of smelting furnace through the 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

After foundry goods carried out surface treatment, carry out homogenizing annealing and process, detailed process is as follows: be warming up to first under 330 ℃, insulation 2.5h, per hour 80 ℃ of intensifications are heated to 550 ℃ of lower insulation 7h, then air coolings, per hour 80 ℃ of intensifications are heated to 380 ℃ again, and insulation degree 5h; Be cooled to 160 ℃ of lower insulation 4h, air cooling to room temperature gets final product again.

Wherein, described insulating covering agent is the mixture that the borax of 40% attapulgite and 60% forms; Described refining agent is made by following raw materials in part by weight: 7 parts in sodium-chlor, 4 parts in Calcium Fluoride (Fluorspan), 4 parts in salt of wormwood, 6 parts of Graphite Powder 99s, 8 parts of Sodium Silicofluorides, 7 parts in 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, with the sepiolite of above-mentioned weight part with 15% salt acid soak 3 hours, deionized water wash soaked 4 hours with 10% sodium hydroxide solution again, again with deionized water wash to neutral, then 520 ℃ of lower calcinings 2.5 hours, be ground into nanometer powder;

B, with after each the heating raw materials melting beyond the sepiolite, clarify 1.5 hours, top clear liquor is poured into water cold quenching, obtain the particle of fragmentation;

C, the mixing of materials stirring that step a, b are obtained namely get described refining agent.

Through check, the product chemical ingredients 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%, 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 (2)

1. the complete processing of an antifatigue aluminium alloy foaming mould foundry goods is characterized in that may further comprise the steps:

(1) batching

Satisfy following requirement: 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% according to the element mass percent, other impurity elements add up to≤0.15%, all the other are Al, prepare burden;

(2) melting

To prepare burden to drop into successively and carry out melting in the smelting furnace, be controlled at 720-750 ℃ in the stove, feed intake behind the 30-50min, when treating to occur aluminium water in the stove, add insulating covering agent and cover, begin to stir, add refining agent through refining, skim obtain qualified composition after, aluminium liquid is injected holding furnace from smelting furnace, furnace temperature leaves standstill under 710-730 ℃ of condition and keeps 20-30min, then utilize argon gas to take the hydrogen in the aluminium liquid and fine impurities to surface, thereby reduce the hydrogen richness in the aluminium liquid;

(3) casting

Aluminium liquid enters crystallizer by the relief hole of smelting furnace through the 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

After foundry goods carried out surface treatment, carrying out homogenizing annealing processes, detailed process is as follows: be warming up to first under 320-340 ℃, insulation 2-3h, per hour 70-90 ℃ of intensification is heated to 540-560 ℃ of lower insulation 6-8h, then air cooling, per hour 60-80 ℃ of intensification is heated to 350-380 ℃ again, and insulation degree 5-6h; Be cooled to 150-170 ℃ of lower insulation 3-4h, air cooling to room temperature gets final product again.

2. the complete processing of high heat-resisting aluminium alloy foaming mould according to claim 1 is characterized in that, described insulating covering agent is the mixture that the borax of the attapulgite of 40-50% and 50-60% forms; 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, with the sepiolite of above-mentioned weight part with 10-15% salt acid soak 3-4 hour, deionized water wash soaked 3-4 hour with the 10-12% sodium hydroxide solution again, and is extremely neutral with deionized water wash again, then 500-530 ℃ of lower calcining 2-3 hour, be ground into nanometer powder;

B, with after each the heating raw materials melting beyond the sepiolite, clarify 1-2 hour, top clear liquor is poured into water cold quenching, obtain the particle of fragmentation;

C, the mixing of materials stirring that step a, b are obtained namely get described refining agent.