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Cast aluminum alloy for automobile metal casting and processing technology of cast aluminum alloy

A technology for casting aluminum alloys and metal castings, which is applied in the field of mechanical parts processing, and can solve problems such as coarse grains, decreased comprehensive performance of aluminum alloys, and reduced yields

Active Publication Date: 2022-03-01
江苏瑞振压铸有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the existing process, defects such as intragranular segregation and coarse grains occur in casting and rolling; these defects easily lead to a decline in the overall performance of the aluminum alloy, and cause the processed products of the aluminum alloy to be damaged due to cracks, dark extrusion lines, granular burrs, etc. Become a waste product, thereby reducing the yield;

Method used

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  • Cast aluminum alloy for automobile metal casting and processing technology of cast aluminum alloy

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Effect test

Embodiment 1

[0049] A cast aluminum alloy for automotive metal castings. In terms of percentages, the composition of the aluminum alloy is: Si 0.5%, Mg2%, Cu 2%, Mn 0.25%, Fe 0.2%, Y 0.08%, Zn 0.4%, Yb 0.1 %, Er 0.1%, Sr 0.1%, the total amount of unavoidable impurity elements does not exceed 0.3%, and the balance is Al;

[0050] A processing technology for casting aluminum alloys for automobile metal castings, comprising the following steps:

[0051] S1: Preheat the crucible to 400°C, put in an aluminum block, raise the temperature until the aluminum block is completely melted, heat to 730°C, remove slag and gas, stir and keep warm for 60 minutes, put yttrium aluminum alloy, magnesium aluminum alloy, zinc sheet, copper The flakes and ytterbium aluminum alloy are crushed, ball-milled into powder and wrapped in aluminum foil, pressed into the melt with a bell jar, stirred by a graphite rod to discharge gas;

[0052] S2: Dip the preheated ultrasonic horn into the melt surface at 15mm for ult...

Embodiment 2

[0061] A cast aluminum alloy for automotive metal castings. In terms of percentages, the aluminum alloy components are: Si 1%, Mg 2.3%, Cu 2.5%, Mn 0.42%, Fe 0.35%, Y 0.08%, Zn 0.6%, Yb 0.2%, Er 0.2%, Sr0.22%, the total amount of unavoidable impurity elements does not exceed 0.3%, and the balance is Al;

[0062] A processing technology for casting aluminum alloys for automobile metal castings, comprising the following steps:

[0063] S1: Preheat the crucible to 405°C, put in an aluminum block, heat up until the aluminum block is completely melted, heat to 745°C, remove slag and degassing, stir and keep warm for 50 minutes, put yttrium aluminum alloy, magnesium aluminum alloy, zinc sheet, copper The flakes and ytterbium aluminum alloy are crushed, ball-milled into powder and wrapped in aluminum foil, pressed into the melt with a bell jar, stirred by a graphite rod to discharge gas;

[0064] S2: Dip the preheated ultrasonic horn into the melt surface at 16mm for ultrasonic trea...

Embodiment 3

[0072] A cast aluminum alloy for automotive metal castings. In terms of percentages, the aluminum alloy components are: Si 1.5%, Mg 2.5%, Cu 3%, Mn 0.65%, Fe 0.5%, Y 0.08%, Zn 0.9%, Yb 0.3%, Er 0.25%, Sr0.3%, the total amount of unavoidable impurity elements does not exceed 0.3%, and the balance is Al;

[0073] A processing technology for casting aluminum alloys for automotive metal castings, characterized in that it comprises the following steps:

[0074] S1: Preheat the crucible to 410°C, put in the aluminum block, raise the temperature until the aluminum block is completely melted, heat to 750°C, remove the slag and gas, stir and keep it warm for 40 minutes, put the yttrium aluminum alloy, magnesium aluminum alloy, zinc sheet, copper The flakes and ytterbium aluminum alloy are crushed, ball-milled into powder and wrapped in aluminum foil, pressed into the melt with a bell jar, stirred by a graphite rod to discharge gas;

[0075] S2: Immerse the preheated ultrasonic horn at...

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Abstract

According to the cast aluminum alloy for the automobile metal casting and the machining technology of the cast aluminum alloy, the comprehensive performance of the cast aluminum alloy is improved by limiting the element composition and content in the aluminum alloy and matching with the optimal design of the machining technology; the aluminum alloy is defined as follows: Zn + Cu < = 2Mg, Er + Sr + Y + Yb < = 0.7%, and the mass ratio of Mn to Fe is 1.1-1.3. The tensile strength of the aluminum alloy is greatly improved through the synergistic effect of Er, Sr, Y and Yb elements; according to the process, second-phase particles are distributed more uniformly and dispersed through high-temperature intermittent ultrasonic treatment, and intra-crystalline segregation is eliminated through homogenizing annealing; the annealed aluminum alloy is subjected to solid solution two-stage aging treatment to eliminate lattice distortion; after the formed aluminum alloy is subjected to arc oxidation, the hole sealing liquid obtained by compounding the potassium fluozirconate, the basic chromium sulfate, the acetic acid and the tartaric acid is used for hole sealing, and compared with existing hole sealing through boiling water, the hole sealing time is short, the hole sealing temperature is low, and the corrosion resistance of the aluminum alloy is effectively improved under low energy consumption.

Description

technical field [0001] The invention relates to the technical field of mechanical parts processing, in particular to a casting aluminum alloy for automobile metal castings and a processing technology thereof. Background technique [0002] Aluminum alloy and processed materials have excellent characteristics such as wear resistance, heat conduction, corrosion resistance, low density, good elasticity, high specific strength and specific stiffness, excellent impact resistance, easy surface coloring, good processing formability and high recycling and regeneration; Can reduce the weight of the car to a greater extent, and aluminum alloys are increasingly used as lightweight materials for the manufacture of auto parts; [0003] The application of aluminum alloys in the automotive field is mainly the casting of engine components and wheel hubs. According to the processing methods, aluminum alloys are divided into two categories: deformed aluminum alloys and cast aluminum alloys; mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/08C22C21/14C22C21/16C22C21/18C22F1/047C22F1/057C22C1/03
CPCC22C21/08C22C21/14C22C21/16C22C21/18C22C1/026C22C1/03C22F1/047C22F1/057
Inventor 张麟雄
Owner 江苏瑞振压铸有限公司
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