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A kind of aluminum alloy material and its sand casting method for replacing qt450 automobile turbocharger shell

A technology of turbocharger and aluminum alloy materials, which is applied in the direction of casting molding equipment, casting mold components, casting molds, etc., and can solve problems such as low mechanical properties, affecting the life of turbochargers, and increasing vehicle use costs

Active Publication Date: 2018-06-29
GUIZHOU HUAKE ALUMINUM MATERIAL ENG TECH RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] There are also relevant researches on aluminum alloy turbochargers in China. Due to the limitations of basic materials, their mechanical properties are low, especially the high-temperature heat resistance. It increases the cost of using the vehicle and even increases the safety risk

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0058] A method for preparing an aluminum alloy material replacing a QT450 automobile turbocharger housing, comprising the following steps:

[0059] (1) Modeling, using molding sand and wooden molds to make molds and preheating.

[0060] (2) within the scope of the aforementioned Lewis acid-base pair and element ratio, select a group of material combinations, determine the weight ratio, and calculate the weight of each required material according to the total amount of alloy prepared as required;

[0061] (3) Add aluminum ingots or molten aluminum into the smelting furnace, heat and keep it above 700°C;

[0062] (4) Add manganese Mn, cadmium Cd, copper Cu and potassium hexafluorosilicate and stir, add selected Lewis acid-base pair, or add selected Lewis acid-base pair combination, and stir evenly;

[0063] (5) carrying out in-furnace refining to above-mentioned alloy melt then;

[0064] (6) After refining, remove slag, leave it still, take samples to analyze the chemical com...

Embodiment 1

[0081] 1. An aluminum alloy automobile turbocharger shell material component weight percent that replaces QT450 is: Cu: 6.0%, Mn: 1.3%, Cd: 0.33%, Co: 0.009%, Zr: 0.13%, Ti: 0.1%, Mn(CO) 6 + :0.01, [Ag(CN) 2 ] － :0.01%, K 2 [SiF 6 ]: 1.4%, Na 2 TiO 3 : 0.04%.

[0082] 2. Preparation method: modeling → preheating → box closing → melting → refining → standing → pouring → solidification → mold opening → cleaning → solid solution → aging

[0083] (1) Modeling: machining allowance > 0.5mm, draft angle: > 1°, casting fillet > R2.

[0084] (2) Sand mold preheating: temperature > 100°C (heat preservation > 1 hour), warm and cool to room temperature before pouring.

[0085] (3) Pouring temperature: >690°C

[0086] (4), filling time: <10s

[0087] (5), solidification time: <10min.

[0088] (6) Heat treatment state: T5-solid solution plus incomplete artificial aging.

[0089] (7) The microstructure index of the product: the metallographic structure is equiaxed grain, the ave...

Embodiment 2

[0092] 1. An aluminum alloy automobile turbocharger shell material component weight percent that replaces QT450 is: Cu: 6.3%, Mn: 1.0%, Cd: 0.38%, Co: 0.01%, Zr: 0.09%, Ti: 0.11%, Mn(CO) 6 + :0.01, [Ag(CN) 2 ] － :0.01%, K 2 [SiF 6 ]: 1.1%.

[0093] 2. The specific preparation method is the same as in Example 1.

[0094] 3. The microstructure index of the product: the metallographic structure is equiaxed crystal, the average grain size is 75-115 μm, and the number of combined phases (T+θH) in the grain is 5-7 / [μm] 2 .

[0095] 4. Mechanical properties of the casting: the resistance strength is 480Mpa, the yield strength is 455Mpa, the elongation after fracture is 5%, and the Brinell hardness is 155.

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Abstract

The invention discloses an aluminum alloy material replacing a QT450 automobile turbocharger shell. The aluminum alloy material is characterized in that the aluminum alloy material is mainly prepared from, by weight percent, 0.5%-1.5% of potassium fluosilicate K2[SiF6], not larger than 2% of manganese (Mn), 0.05%-0.5% of cadmium (Cd), 4.2%-8.0% of cuprum (Cu), 1%*10<-4>-2.0% of Lewis acid and alkali pairs and the balance Al, wherein the percent of Cu is larger than or equal to 0.8Mn+4.05%, and the average alloy grain size is smaller than 120 micrometers.

Description

technical field [0001] The invention relates to an aluminum alloy material for replacing the casing of a QT450 automobile turbocharger and a preparation method thereof. Background technique [0002] Ductile iron (referred to as ductile iron) is one of the main basic materials in the iron and steel industry. , agriculture, automobile, casting, textile, machine tool, electric power, petrochemical, ship parts, etc. The main forms and types are hydraulic housing, pump body, pipeline, valve body, cylinder block, hub, shaft, ball connection, transmission part, Suspension pieces, hook fasteners, deflectors, steering pieces, etc. [0003] The production and manufacture of ductile iron products need to be carried out at a very high temperature, and the corresponding energy consumption is also high, and the pollution is large. With the requirements of automobile lightweight and energy saving and environmental protection, related ductile iron products urgently need to find early new s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/12C22C21/14C22C1/02C22C1/06C22F1/057B22C9/02B22C9/22
CPCB22C9/02B22C9/22C22C1/026C22C1/06C22C21/12C22C21/14C22F1/002C22F1/057
Inventor 车云门三泉张中可
Owner GUIZHOU HUAKE ALUMINUM MATERIAL ENG TECH RES