CN105603270A

CN105603270A - Die-casting aluminum alloy for engine components and production method of die-casting aluminum alloy

Info

Publication number: CN105603270A
Application number: CN201610054771.8A
Authority: CN
Inventors: 梁健
Original assignee: GUANGXI PINGGUO ALUMINUM PRECISION CASTING Co Ltd
Current assignee: GUANGXI PINGGUO ALUMINUM PRECISION CASTING Co Ltd
Priority date: 2016-01-27
Filing date: 2016-01-27
Publication date: 2016-05-25
Anticipated expiration: 2036-01-27
Also published as: CN105603270B

Abstract

The invention discloses die-casting aluminum alloy for engine components. The die-casting aluminum alloy is prepared from, by mass, 3.6%-6.0% of Si, 2.2%-2.9% of Mg, 0.9%-1.3% of Cu, 0.28%-0.39% of Fe, 0.08%-0.16% of Sr, 0.12%-0.25% of Zn, 0.08%-0.10% of Ga, 0.01%-0.03% of Er, no more than 0.5% of other metal or non-metal impurity elements and the balance Al. The production method of the die-casting aluminum alloy comprises the steps of melting, refining, standing, die casting, solid-solution quenching treating and aging treating. Accordingly, the produced aluminum alloy material has the advantages that the interior is free of pores, the tensile strength and the yield strength are significantly improved, the toughness is high, the compression resistance is good, the good corrosion resistance is achieved, and the requirements of the engine components can be met.

Description

A kind of engine component pack alloy and production method thereof

Technical field

The present invention relates to aluminium alloy manufacture field, particularly pack alloy and production method thereof for a kind of engine component.

Background technology

Over nearly 20 years, worldwide energy problem becomes more and more serious, and this makes to alleviate automotive dead weight, reduction oil consumption has become eachThe key that large auto producer is improved the competitiveness. According to relevant data introduction, the every minimizing of vehicle weight 50kg, every liter of fuel oil travelsDistance can increase 2km; Vehicle weight often alleviates 1%, and fuel consume declines 0.6%～1%. Aluminium has that density is little, corrosion resistanceThe feature such as good, and the plasticity of aluminium alloy is good, and casting, forging, Sheet Metal Forming Technology are all suitable for, the die casting that the most applicable auto parts and components are producedTechnique. From several aspects comparisons such as production cost, part quality, material uses, it is indispensable that aluminium alloy has become automobile productionImportant materials; There is data to show, by aluminium alloy structure replacement conventional steel structure, can make car mass alleviate 30%～40%,Manufacture engine and can alleviate 30%, make wheels and can alleviate 50%. Adopt aluminium alloy be automotive light weight technology and environmental protection, energy-conservation, carryOne of speed and the efficient important channel of transport.

The cylinder block of engine and cylinder cap all require the good heat conductivity of material, resistance to corrosion strong, and aluminium alloy in these areasThere is very outstanding advantage; But aluminium alloy, compared with steel construction, is short of to some extent aspect intensity, therefore, improve aluminium alloy materialThe intensity of material, the emphasis that hardness becomes research.

Summary of the invention

The invention provides a kind of engine component pack alloy and production method thereof, make aluminium alloy there is good mechanicalnessCan, can be widely used on the member such as cylinder body, framework, oil cylinder of engine.

For achieving the above object, technical scheme of the present invention is:

A kind of engine component pack alloy, the mass percent of its component and each component is: Si3.6～6.0%,Mg2.2～2.9％、Cu0.9～1.3％、Fe0.28～0.39％、Sr0.08～0.16％、Zn0.12～0.25％、Ga0.08～0.10％、Er0.01～0.03%, other metals and nonmetallic impurity element total amount are no more than 0.5%, and all the other are Al.

Preferably, described engine component by the component of pack alloy and the mass percent of each component is: Si4.9%,Mg2.5%, Cu1.1%, Fe0.35%, Sr0.13%, Zn0.2%, Ga0.09%, Er0.02%, other metals and nonmetalImpurity element total amount be no more than 0.5%, all the other are Al.

A production method for pack alloy for engine component, comprises the following steps:

(1) fusing: first fine aluminium, pure magnesium, alusil alloy are added in smelting furnace, be heated to 730～750 DEG C and also stir and make alloyFusing, then adds cathode copper, alfer, alumin(i)um zinc alloy and magnesium strontium alloy completely, continues to be warming up to 770～780 DEG C, treatsAlloying element all obtains molten aluminium alloy after fusing;

(2) refining: the temperature of molten aluminium alloy is adjusted to 750～770 DEG C, sprays into refining agent and carry out refining treatment, refining is completeAfter becoming, leave standstill 5～10min, the surperficial slag of molten aluminium alloy is clawed, be then warming up to 750-760 DEG C, add fining agent and aluminiumGallium alloy, Al-Er alloy, pass into argon gas and carry out refinery by de-gassing, and the degasification time is 12～16min, and the complete inspection aluminium alloy of degasification is moltenLiquid composition, to be testedly skims after qualified for the second time, completes refining process;

(3) leave standstill: the molten aluminium alloy after refining is left standstill, treat that molten aluminium alloy temperature is down to 690～710 DEG C;

(4) die casting: the die cavity of mould is preheated to 220～230 DEG C, then will presses after step (3) molten aluminium alloy after treatmentBe mapped in the die cavity of mould, the liquation flow velocity when wherein filling type and starting is that 0.26～0.30m/s, casting pressure are 30～35MPa, fillsAfter type rate exceedes 60%, flow velocity to the 1.7～1.9m/s, the casting pressure that improve liquation are 55～60MPa, until fill type die casting knotBundle;

(5) solution hardening processing: quenching temperature is 520～530 DEG C, and Quenching Soaking Time is 50～60min, and quenching turnsShift time≤28s, after quenching, the storage period is 3.5h;

(6) one-level Ageing Treatment, temperature is 180～190 DEG C, the time is 5h; Secondary time effect processing, temperature is 70～80 DEG C,Time is 3h; After completing, obtain pack alloy finished product.

The present invention has the following advantages:

(1) by the rational proportion of the elements such as Al, Mg, Si, and added especially Ga, Er element, aluminium alloy is hadGood processing characteristics and higher thermal conductivity factor, and obtained the aluminum alloy organization through modifying-refining, improve the machine of aluminium alloyTool performance;

(2) selected suitable melting and heat treatment process parameter, made the inner pore-free of aluminum alloy materials of production, in tensionIntensity, yield strength also have significantly lifting, and toughness is large, compressive property is good, also has good corrosion resistance, can meetThe requirement of engine component.

Detailed description of the invention

Below in conjunction with specific embodiment, the invention will be further described, but protection scope of the present invention and range of application be not limited toLower embodiment:

Embodiment 1

A kind of engine component pack alloy, the mass percent of its component and each component is: Si4.9%, Mg2.5%,Cu1.1%, Fe0.35%, Sr0.13%, Zn0.2%, Ga0.09%, Er0.02%, other metals and nonmetallic impurity elementTotal amount is no more than 0.5%, and all the other are Al.

The production method of pack alloy for above-mentioned engine component, comprises the following steps:

(6) one-level Ageing Treatment, temperature is 185 DEG C, the time is 5h; Secondary time effect processing, temperature is 75 DEG C, the time is3h; After completing, obtain pack alloy finished product.

The aluminium alloy that adopts said method to make, at room temperature tests its performance: hot strength is 336MPa, and yield strength is221MPa, percentage elongation is 14.9%; Recording in addition its thermal conductivity factor is 269W/mK.

Embodiment 2

A kind of engine component pack alloy, the mass percent of its component and each component is: Si3.6%, Mg2.2%,Cu0.9%, Fe0.28%, Sr0.08%, Zn0.12%, Ga0.08%, Er0.01%, other metals and nonmetallic impurity elementTotal amount is no more than 0.5%, and all the other are Al.

(6) one-level Ageing Treatment, temperature is 180 DEG C, the time is 5h; Secondary time effect processing, temperature is 70 DEG C, the time is3h; After completing, obtain pack alloy finished product.

The aluminium alloy that adopts said method to make, at room temperature tests its mechanical performance: hot strength is 293MPa, and surrender is strongDegree is 205MPa, and percentage elongation is 13.9%; Recording in addition its thermal conductivity factor is 241W/mK.

Embodiment 3

A kind of engine component pack alloy, the mass percent of its component and each component is: Si6.0%, Mg2.9%,Cu1.3%, Fe0.39%, Sr0.16%, Zn0.25%, Ga0.10%, Er0.03%, other metals and nonmetallic impurity elementTotal amount is no more than 0.5%, and all the other are Al.

(6) one-level Ageing Treatment, temperature is 190 DEG C, the time is 5h; Secondary time effect processing, temperature is 80 DEG C, the time is3h; After completing, obtain pack alloy finished product.

The aluminium alloy that adopts said method to make, at room temperature tests its mechanical performance: hot strength is 333MPa, and surrender is strongDegree is 229MPa, and percentage elongation is 15.0%; Recording in addition its thermal conductivity factor is 269W/mK.

Claims

1. an engine component pack alloy, is characterized in that:

The component of described aluminium alloy and the mass percent of each component are: Si3.6～6.0%, Mg2.2～2.9%, Cu0.9～1.3%,Fe0.28～0.39%, Sr0.08～0.16%, Zn0.12～0.25%, Ga0.08～0.10%, Er0.01～0.03%, other metals andNonmetallic impurity element total amount is no more than 0.5%, and all the other are Al.

2. engine component pack alloy according to claim 1, is characterized in that:

The component of described aluminium alloy and the mass percent of each component are: Si4.9%, Mg2.5%, Cu1.1%, Fe0.35%,Sr0.13%, Zn0.2%, Ga0.09%, Er0.02%, other metals and nonmetallic impurity element total amount are no more than 0.5%,All the other are Al.

3. the production method of pack alloy for engine component according to claim 1 and 2, it is characterized in that comprising withLower step:

(4) die casting: the die cavity of mould is preheated to 220～230 DEG C, then will presses after step (3) molten aluminium alloy after treatmentBe mapped in the die cavity of mould, the liquation flow velocity when wherein filling type and starting is that 0.26～0.30m/s, casting pressure are 30～35MPa,Fill after type rate exceedes 60%, flow velocity to the 1.7～1.9m/s, the casting pressure that improve liquation are 55～60MPa, until fill type die castingFinish;