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Light automobile steering gear aluminum alloy material replacing QT400 and gravity casting method of aluminum alloy material

A technology of automobile steering gear and aluminum alloy materials, which is applied in the field of aluminum alloy materials and their gravity casting, can solve the problems of low strength, low hardness, increased manufacturing cost, and failure to achieve the mechanical properties of ductile iron materials, etc., and achieve high product yield, Excellent casting performance

Active Publication Date: 2016-09-28
GUIZHOU HUAKE ALUMINUM MATERIAL ENG TECH RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] Most of the existing aluminum alloy material diverters are aluminum-silicon and aluminum-copper series. Aluminum-silicon (Al-Si) has good formability but low strength and hardness, and cannot reach the mechanical properties of ductile iron (QT400). Driving under the road surface cannot meet the normal steering operation of the vehicle; while the aluminum-copper series (Al-Cu) can achieve high strength, but it is very unstable and has poor casting formability (it cannot be cast with metal molds), and the low yield leads to manufacturing costs. Increase

Method used

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  • Light automobile steering gear aluminum alloy material replacing QT400 and gravity casting method of aluminum alloy material
  • Light automobile steering gear aluminum alloy material replacing QT400 and gravity casting method of aluminum alloy material
  • Light automobile steering gear aluminum alloy material replacing QT400 and gravity casting method of aluminum alloy material

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preparation example Construction

[0059] A preparation method of an aluminum alloy material replacing a QT400 light-duty automobile steering gear, comprising the following steps:

[0060] (1) 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] (2) Add aluminum ingots or molten aluminum into the smelting furnace, heat and keep it above 700°C;

[0062] (3) Add manganese Mn, cadmium Cd, copper Cu, titanium Ti, stir, add selected Lewis acid-base pair, or add selected Lewis acid-base pair combination, and stir evenly;

[0063] (4) carrying out in-furnace refining to above-mentioned alloy melt then;

[0064] (5) After refining, remove slag, let it stand still, take samples to analyze the chemical composition of the alloy, and adjust the chemical composition to the specified deviation range according to...

Embodiment 1

[0080] A kind of automobile K series aluminum alloy steering gear and its gravity casting method

[0081] 1. Steering gear parameters:

[0082]

[0083] 2. Production process: smelting → degassing → pouring → cooling → mold opening and picking → cleaning, sawing → solid solution → aging

[0084] 3. Alloy formula

[0085] weight percentage (%)

[0086]

[0087] 4. The melt pouring temperature is 700-720°C;

[0088] 5. The mold preheating temperature is 320-400°C;

[0089] 6. Switch to pouring method, filling time is 8-12s;

[0090] 7. Cooling time: 240~360s;

[0091] 8. Solid solution temperature 530-550°C, heat preservation for 10 hours, rapid water cooling <10s, water temperature 40-55°C;

[0092] 9. The aging temperature is 145-175°C, heat preservation for 4 hours, and air cooling.

[0093] 10. The microstructure index of the casting: the metallographic structure is equiaxed grain, the average grain size is 40μm, and the number of combined phases (T+θH) in the g...

Embodiment 2

[0097] A kind of automobile M series aluminum alloy steering gear and its gravity casting method

[0098] 1. Steering gear parameters:

[0099]

[0100] 2. Production process: smelting → degassing → pouring → cooling → mold opening and picking → cleaning, sawing → solid solution → aging

[0101] 3. Alloy formula weight percentage (%)

[0102]

[0103] 4. Melt pouring temperature 710~740℃;

[0104] 5. The mold preheating temperature is 380-450°C;

[0105] 6. Tilting pouring method, the filling time is 12-15s;

[0106] 7. Cooling time: 240-400s;

[0107] 8. The solid solution temperature is 560-570°C, heat preservation for 8 hours, rapid water cooling <10s, water temperature 40-55°C;

[0108] 9. The aging temperature is 120-130 ℃, heat preservation for 6 hours, and air cooling.

[0109] 10. The microstructure index of the casting: the metallographic structure is equiaxed grain, the average grain size is 45μm, and the number of combined phases (T+θH) in the grain is 1...

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Abstract

The invention discloses a light automobile steering gear aluminum alloy material replacing a QT400. The light automobile steering gear aluminum alloy material replacing the QT400 is characterized in that main components comprise, by weight percentage, 0.08%-0.25% of titanium Ti, smaller than or equal to 2% of manganese Mn, 0.05%-0.5% of cadmium Cd, 4.2%-8.0% of copper Cu, 1%x10<-4>-2.0% of Lewis acid-base pairs and the balance aluminum, wherein Cu>=0.8Mn+4.05%, and the alloy mean grain size is smaller than 120 microns.

Description

technical field [0001] The invention relates to an aluminum alloy material for replacing the steering gear of a QT400 light automobile and a gravity casting method thereof. Background technique [0002] Ductile iron (referred to as ductile iron) is one of the main materials used in the automotive steering gear industry. The reason lies in the low price, stable mechanical properties and physical indicators of ductile iron. [0003] The grade of ductile iron 400 stipulates a relatively strict and precise chemical composition combination, heat treatment specification parameters, mechanical properties and physical indicators, etc. See Table 1. [0004] Table 1 The mechanical properties and structures corresponding to the grades of ductile iron determined by GB / T 1348 [0005] [0006] The mechanical performance index and classification standard of ductile iron can be used as the benchmarking basis for innovative design and performance improvement of aluminum alloy materials...

Claims

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Application Information

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IPC IPC(8): C22C1/02C22C1/06C22C21/14C22C21/12C22F1/057
CPCC22C1/026C22C1/06C22C21/12C22C21/14C22F1/057
Inventor 车云张中可门三泉
Owner GUIZHOU HUAKE ALUMINUM MATERIAL ENG TECH RES
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