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Substitutive QT400 aluminum alloy flywheel brake caliper material and gravity casting forming method thereof

A gravity casting and brake caliper technology, which is applied in the field of replacing QT400 aluminum alloy flywheel brake caliper materials and its preparation, can solve the problems of high inertia, easy corrosion, and impact on life of ductile iron, and achieve alloy grain size refinement, The effect of rounded shape and enhanced strength

Active Publication Date: 2016-11-16
GUIZHOU HUAKE ALUMINUM MATERIAL ENG TECH RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] ⑦ From the comparison of processing technology, aluminum materials can easily obtain parts with complex shapes or cross-sections, while processing such complex parts with ductile iron requires more processes and equipment and consumes higher power than aluminum materials
[0023] Small amount is easy to break, causing accidents
[0024] ②The heat treatment process of ductile iron is complex, requires high equipment and technology, and consumes a lot of energy and emissions
[0025] ③ Along the entire life cycle of parts application, due to defects such as large inertia, bulkiness, corrosion, and brittleness of ductile iron, its material consumption, energy consumption, and maintenance costs are higher than that of steel, and its recycling value is low
[0026] There is no relevant research on aluminum alloy flywheel brake caliper housings in China, because of the limitations of ordinary aluminum alloy base materials, its mechanical properties are low, especially high temperature heat resistance, and the temperature it withstands is less than 300 ° C, which seriously affects the service life and even increases security risk

Method used

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  • Substitutive QT400 aluminum alloy flywheel brake caliper material and gravity casting forming method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0117] 1. An aluminum alloy flywheel brake caliper housing that replaces QT400. The weight percentage of the material is: Mn: 0.3%, Cd: 0.05%, Cu: 5.3%, Si: 1.3%, Mg: 0.5%, TiC0.05% , [Cd(CN) 4 ] 2- : 0.01%, LiH: 0.15%, the balance is aluminum Al;

[0118] 2. Preparation method: melt → pouring → cavity tipping → filling and solidification → solid solution → aging

[0119] (1) Melt pouring temperature ≥ 690°C;

[0120] (2) Mold preheating temperature ≥ 400°C;

[0121] (3) Filling time ≤ 25s;

[0122] (4) Cavity tipping speed ≥ 30 degrees / second, holding time ≥ 3min;

[0123] (5) Heat treatment state: T6 - solid solution plus complete artificial aging;

[0124] 3. The microstructure index of the product: the metallographic structure is equiaxed crystal, the average grain size is 120μm, and the number of combined phases (T+θH) in the grain is 5 / [μm] 2 ;

[0125] 4. Mechanical properties of castings: tensile strength 440Mpa, yield strength 336 Mpa, elongation after fract...

Embodiment 2

[0127] 1. An aluminum alloy flywheel brake caliper housing that replaces QT400. The weight percentage of the material is: Mn: 0.5%, Cd: 0.06%, Cu: 6.8%, Si: 1.8%, Mg: 0.55%, Ti: 0.03% , [Cd(CN) 4 ] 2- : 0.02%, LiH: 0.12%, the balance is aluminum Al;

[0128] 2, preparation method: with embodiment 1;

[0129] 3. Product microstructure index: the metallographic structure is equiaxed grain, the average grain size is 115μm, and the number of (T+θH) combination phases in the grain is 4 / [μm] 2 ;

[0130] 4. Mechanical properties of castings: tensile strength is 435Mpa, yield strength is 320Mpa, elongation after fracture is 12.5%, and Brinell hardness is 120.

Embodiment 3

[0132]1. An aluminum alloy flywheel brake caliper housing that replaces QT400 The weight percentage of the material composition is: Mn: 0.5%, Cd: 0.06%, Cu: 6.0%, Si: 0.8%, [Cd(CN) 4 ] 2- : 0.45%, the balance is aluminum Al;

[0133] 2, preparation method: with embodiment 1;

[0134] 3. The microstructure index of the product: the metallographic structure is equiaxed grain, the average grain size is 115μm, and the number of combined phases (T+θH) in the grain is 3-4 / [μm] 2 ;

[0135] 4. Mechanical properties of castings: tensile strength is 425Mpa, yield strength is 310Mpa, elongation after fracture is 12.5%, and Brinell hardness is 110.

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Abstract

The invention discloses a substitutive QT400 aluminum alloy flywheel brake caliper shell material. The substitutive QT400 aluminum alloy flywheel brake caliper shell material is characterized in that the material comprises, by weight, no more than 2% of Mn, 0.05%-0.5% of Cd, 4.2%-8.0% of Cu, 0.5%-2.0% of Si and the balance Al; the percentage of Cu is not smaller than 0.8*Mn+4.05%; and the total amount of Lewis acid-base pairs is 1%*10<-4> to 2%, so that the mean grain size of alloy is smaller than 120 micrometers.

Description

technical field [0001] The invention relates to a material for replacing QT400 aluminum alloy flywheel brake caliper and a preparation method thereof. Background technique [0002] Ductile iron (referred to as ductile iron) is widely used in the manufacture of parts with high strength and good wear resistance such as transmission boxes, pump casings, cylinders, pistons, hubs, transmission parts, and steering parts; the reason why ductile iron is widely used lies in It has subdivided standard grades, and each grade stipulates stricter and more precise chemical composition combinations, heat treatment specification parameters, mechanical properties and physical indicators, etc., thus corresponding to subdivided application categories. See Table 1. [0003] Table 1 The mechanical properties and structures corresponding to the grades of ductile iron determined by GB / T 1348 [0004] [0005] The mechanical performance index and classification of ductile iron can be used as t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/14B22D21/04
CPCB22D21/04C22C21/14
Inventor 张中可车云门三泉
Owner GUIZHOU HUAKE ALUMINUM MATERIAL ENG TECH RES
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