CN103484731A - Aluminum alloy for automobile wheel hubs and preparation method thereof - Google Patents

Abstract

The invention discloses an aluminum alloy for automobile wheel hubs and a preparation method thereof. The aluminum alloy is composed of the following elements in percentage by mass: 6-8% of Si, 0.4-0.6% of Mg, 0.5-1.0% of Fe, 0.15-0.25% of Cu, 0.1-0.3% of Zn, 0.3-0.5% of Mn, 0.15-0.25% of Ti, 0.06-0.12% of Mo, 0.04-0.08% of Sn, 0.03-0.06% of Nb, 0.015-0.025% of Sr, 0.01-0.02% of Ta, 0.04-0.06% of Ce, 0.03-0.05% of Er, 0.02-0.03% of Yb and the balance of aluminum. A technique combining modification using Ce, Er, Yb and other rare-earth elements with argon degassing refinement is utilized to refine the silicon phase, thereby enhancing the impact ductility and high-temperature strength of the alloy. The aluminum alloy has the advantages of excellent comprehensive properties, high heat conductivity, quick heat dissipation, high mechanical strength, high machinability, excellent wear resistance, excellent heat resistance, excellent impact resistance, high reliability and high durability.

Description

A kind of aluminum alloy for automobile wheel hub and preparation method thereof

Technical field

The present invention relates to a kind of aluminum alloy for automobile wheel hub and preparation method thereof, belong to the aluminum alloy materials field.

Background technology

?aluminium alloy quality is light, intensity is high, plasticity is good, moderate, the rate of recovery is high, to reducing automotive dead weight, reduce oil consumption, alleviate environmental pollution and have great significance with improving processing property etc., has become the preferred material of automotive hub.The safety and reliability of automobile depends on over-all properties and the work-ing life of aluminium alloy wheel hub used to a great extent.Rapid raising and the large development of producing of industry along with aluminium alloy wheel hub output.The problems such as limited such as rotten treatment effect, that over-all properties is unstable have been shown gradually in production process.

Summary of the invention

The object of the invention is to aluminum alloy for automobile wheel hub and preparation method thereof, the performances such as the impelling strength of raising aluminium alloy wheel hub, high-temperature stability, wear resistance.

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

A kind of aluminum alloy for automobile wheel hub, its each element consists of by mass percentage: Si 6-8, Mg 0.4-0.6, Fe 0.5-1.0, Cu 0.15-0.25, Zn 0.1-0.3, Mn 0.3-0.5, Ti 0.15-0.25, Mo 0.06-0.12, Sn 0.04-0.08, Nb 0.03-0.06, Sr 0.015-0.025, Ta 0.01-0.02, Ce 0.04-0.06, Er 0.03-0.05, Yb 0.02-0.03, surplus are aluminium.

The preparation method of aluminum alloy for automobile wheel hub: aluminium ingot is put in smelting furnace, be heated to 660-680 ℃, after the aluminium ingot fusing, add the Al-Si alloy, be warming up to 690-710 ℃, after alloy melting, add again magnesium ingot, zinc ingot metal, foundry returns, Al-Cu alloy, Al-Mn alloy, stir 35-45min, then be warming up to 750-780 ℃, add refining agent refining 10-15min, rear standing 5-10min skims; Be cooled to 710-730 ℃, add rare earth alloy ingot and Al-Ti-C-Sr master alloy, stir 10-15min, then use argon gas refinery by de-gassing 5-10min, the rear standing 2-3min that skims, casting at 720-740 ℃ of temperature; The alloy pig of gained is warming up to 450-480 ℃ with 220-240 ℃/h speed, insulation 4-8h, then be cooled to 330-360 ℃ with 80-100 ℃/h speed, insulation 2-3h, put into 80-100 ℃ of water and be incubated 10-15h, take out the high wind air cooling to room temperature, with 150-180 ℃/h speed, be warming up to 320-350 ℃, insulation 3-4h, be warming up to 510-530 ℃ with 100-120 ℃/h speed again, insulation 5-10h, then be cooled to 150-170 ℃ with 180-220 ℃/h speed, insulation 2-3h, air cooling to room temperature gets final product;

Described refining agent preparation method is as follows: a. takes the raw material of following weight part: magnesium chloride 10-15, bariumchloride 5-10, potassium sulphide 5-10, vermiculite 8-12, sodium aluminum fluoride 5-10, quartz sand 3-6, bauxitic clay 4-8, water glass 20-30, nano-silicon nitride 5-10, nano silicon carbide calcium 8-12; B. vermiculite, sodium aluminum fluoride, quartz sand, bauxitic clay were pulverized to the 400-500 mesh sieve, mix, add again water glass, nano-silicon nitride, nano silicon carbide calcium and appropriate water, 3000-5000rpm speed lapping 5-10min, granulate, then by the particle that makes at 450-480 ℃ of lower roasting 3-5h, be cooled to room temperature, stand-by; C. magnesium chloride, bariumchloride, potassium sulphide are mixed, be heated to 930-950 ℃, after its whole meltings, the particle that above-mentioned steps (b) is made adds in fused solution and stirs, and pours into bulk, treats that it is cooled to room temperature and is the gained refining agent.

The de-percentage of admixture of refining agent of the present invention between 65-75%, remove the inclusion in aluminium alloy and make inclusion modification effective, purify aluminium alloy and improved internal soundness, degree of porosity reduces the 1-2 degree, is controlled effectively.

 

Beneficial effect of the present invention:

The present invention adopts the rare earth elements such as Ce, Er, Yb to go bad and processes the technique combined with the argon gas refinery by de-gassing, refinement silicon phase, to put forward heavy alloyed impelling strength and hot strength, the aluminium alloy excellent combination property that the present invention makes, high heat conduction, rapid heat dissipation, physical strength is high, easily shapes, and has good wear resistance, thermotolerance, shock resistance, fully reliable, durable in use.

Embodiment

a kind of aluminum alloy for automobile wheel hub, its each element consists of by mass percentage: Si 6-8, Mg 0.4-0.6, Fe 0.5-1.0, Cu 0.15-0.25, Zn 0.1-0.3, Mn 0.3-0.5, Ti 0.15-0.25, Mo 0.06-0.12, Sn 0.04-0.08, Nb 0.03-0.06, Sr 0.015-0.025, Ta 0.01-0.02, Ce 0.04-0.06, Er 0.03-0.05, Yb 0.02-0.03, surplus are aluminium.

The preparation method of aluminum alloy for automobile wheel hub: aluminium ingot is put in smelting furnace, be heated to 680 ℃, after the aluminium ingot fusing, add the Al-Si alloy, be warming up to 705 ℃, after alloy melting, add again magnesium ingot, zinc ingot metal, foundry returns, Al-Cu alloy, Al-Mn alloy, stir 40min, then be warming up to 760 ℃, add refining agent refining 15min, rear standing 8min skims; Be cooled to 7120 ℃, add rare earth alloy ingot and Al-Ti-C-Sr master alloy, stir 15min, then use argon gas refinery by de-gassing 10min, the rear standing 3min that skims, casting at 720-740 ℃ of temperature; The alloy pig of gained is warming up to 480 ℃ with 240 ℃/h speed, insulation 5h, then be cooled to 350 ℃ with 100 ℃/h speed, insulation 3h, put into 80 ℃ of water and be incubated 10h, take out the high wind air cooling to room temperature, with 160 ℃/h speed, be warming up to 330 ℃, insulation 4h, be warming up to 515 ℃ with 120 ℃/h speed again, insulation 8h, then be cooled to 160 ℃ with 220 ℃/h speed, insulation 2h, air cooling to room temperature gets final product;

Described refining agent preparation method is as follows: a. takes the raw material of following weight (kg): magnesium chloride 15, bariumchloride 10, potassium sulphide 6, vermiculite 10, sodium aluminum fluoride 7, quartz sand 4, bauxitic clay 6, water glass 27, nano-silicon nitride 8, nano silicon carbide calcium 10; B. vermiculite, sodium aluminum fluoride, quartz sand, bauxitic clay were pulverized to 500 mesh sieves, mixed, then added water glass, nano-silicon nitride, nano silicon carbide calcium and appropriate water, 4000rpm speed lapping 8min, granulate, then by the particle that makes at 450 ℃ of lower roasting 5h, be cooled to room temperature, stand-by; C. magnesium chloride, bariumchloride, potassium sulphide are mixed, be heated to 935 ℃, after its whole meltings, the particle that above-mentioned steps (b) is made adds in fused solution and stirs, and pours into bulk, treats that it is cooled to room temperature and is the gained refining agent.

The aluminium alloy made is through check, and its salient features is: tensile strength 314Mpa, yield strength is 189Mpa, impelling strength 18 kg/cm2, thermal conductivity 216W/mk, unit elongation 9.4%.

Claims (2)

1. an aluminum alloy for automobile wheel hub, it is characterized in that: its each element consists of by mass percentage: Si 6-8, Mg 0.4-0.6, Fe 0.5-1.0, Cu 0.15-0.25, Zn 0.1-0.3, Mn 0.3-0.5, Ti 0.15-0.25, Mo 0.06-0.12, Sn 0.04-0.08, Nb 0.03-0.06, Sr 0.015-0.025, Ta 0.01-0.02, Ce 0.04-0.06, Er 0.03-0.05, Yb 0.02-0.03, surplus are aluminium.

2. the preparation method of aluminum alloy for automobile wheel hub according to claim 1, it is characterized in that: aluminium ingot is put in smelting furnace, be heated to 660-680 ℃, after the aluminium ingot fusing, add the Al-Si alloy, be warming up to 690-710 ℃, after alloy melting, then add magnesium ingot, zinc ingot metal, foundry returns, Al-Cu alloy, Al-Mn alloy, stir 35-45min, then be warming up to 750-780 ℃, add refining agent refining 10-15min, rear standing 5-10min skims; Be cooled to 710-730 ℃, add rare earth alloy ingot and Al-Ti-C-Sr master alloy, stir 10-15min, then use argon gas refinery by de-gassing 5-10min, the rear standing 2-3min that skims, casting at 720-740 ℃ of temperature; The alloy pig of gained is warming up to 450-480 ℃ with 220-240 ℃/h speed, insulation 4-8h, then be cooled to 330-360 ℃ with 80-100 ℃/h speed, insulation 2-3h, put into 80-100 ℃ of water and be incubated 10-15h, take out the high wind air cooling to room temperature, with 150-180 ℃/h speed, be warming up to 320-350 ℃, insulation 3-4h, be warming up to 510-530 ℃ with 100-120 ℃/h speed again, insulation 5-10h, then be cooled to 150-170 ℃ with 180-220 ℃/h speed, insulation 2-3h, air cooling to room temperature gets final product;

Described refining agent preparation method is as follows: a. takes the raw material of following weight part: magnesium chloride 10-15, bariumchloride 5-10, potassium sulphide 5-10, vermiculite 8-12, sodium aluminum fluoride 5-10, quartz sand 3-6, bauxitic clay 4-8, water glass 20-30, nano-silicon nitride 5-10, nano silicon carbide calcium 8-12; B. vermiculite, sodium aluminum fluoride, quartz sand, bauxitic clay were pulverized to the 400-500 mesh sieve, mix, add again water glass, nano-silicon nitride, nano silicon carbide calcium and appropriate water, 3000-5000rpm speed lapping 5-10min, granulate, then by the particle that makes at 450-480 ℃ of lower roasting 3-5h, be cooled to room temperature, stand-by; C. magnesium chloride, bariumchloride, potassium sulphide are mixed, be heated to 930-950 ℃, after its whole meltings, the particle that above-mentioned steps (b) is made adds in fused solution and stirs, and pours into bulk, treats that it is cooled to room temperature and is the gained refining agent.