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High-strength coarse-grain-ring-free aluminum alloy bar for automotive control arm and preparation method of aluminum alloy bar

An automobile control arm and aluminum alloy technology, applied in the field of alloy materials, can solve problems such as insufficient mechanical properties and fatigue resistance

Active Publication Date: 2017-01-25
JIANGSU ASIA PACIFIC LIGHT ALLOY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the defects of insufficient mechanical properties and fatigue resistance of existing automotive aluminum alloy steering control arm materials, and provide a Rh blood group antigen detection card

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A high-strength aluminum alloy bar material for automobile control arms without coarse-grained rings, comprising the following components:

[0021] Si0.9%, Fe0.3%, Cu0.15%, Mn0.4%, Mg0.7%, Cr0.17%, Zn0.15%, Zr0.02%, and the balance is Al.

[0022] The preparation method of the aluminum alloy bar comprises the following steps:

[0023] 1) Melting Put the aluminum ingot into the furnace and heat it to 720°C to melt it;

[0024] 2) Slag removal Sprinkle the slag removal agent evenly into the furnace at 715°C and stir it fully for 20 minutes, and remove the scum on the surface of the aluminum liquid with a rake; the amount of the slag removal agent is 0.3KG per ton of aluminum;

[0025] 3) Add Si, Fe, Cu, Mn, Mg, Cr, Zn, Zr when the melt temperature is 740℃, and stir for 20 minutes to mix the ingredients in the melt evenly; the content of Si, Mg, Fe, Zn is as follows This ratio, and the addition of an appropriate amount of Cu elements can improve the mechanical properties...

Embodiment 2

[0032] A high-strength aluminum alloy bar material for automobile control arms without coarse-grained rings, comprising the following components:

[0033] Si1.2%, Fe0.3%, Cu0.2%, Mn0.6%, Mg0.7%, Cr0.25%, Zn0.15%, Zr0.04%, and the balance is Al.

[0034] The preparation method of the aluminum alloy bar comprises the following steps:

[0035] 1) Melting Put the aluminum ingot into the furnace and heat it to 760°C to melt it;

[0036] 2) Slag removal Sprinkle the slag removal agent evenly into the furnace at 760°C and fully stir for 25 minutes, then use a rake to remove the scum on the surface of the molten aluminum; the amount of the slag removal agent is 0.3KG per ton of aluminum;

[0037] 3) Add Si, Fe, Cu, Mn, Mg, Cr, Zn, Zr when the melt temperature is 760℃, and stir for 25 minutes to mix the ingredients in the melt evenly; the contents of Si, Mg, Fe, Zn are as follows This ratio, and the addition of an appropriate amount of Cu elements can improve the mechanical propertie...

Embodiment 3

[0044] A high-strength aluminum alloy bar material for automobile control arms without coarse-grained rings, comprising the following components:

[0045] Si 1.0%, Fe 0.3%, Cu 0.17%, Mn 0.5%, Mg 0.7%, Cr 0.21%, Zn 0.15%, Zr 0.03%, and the balance is Al.

[0046] The preparation method of the aluminum alloy bar comprises the following steps:

[0047] 1) Melting Put the aluminum ingot into the furnace and heat it to 740°C to melt it;

[0048] 2) Slag removal Sprinkle the slag removal agent evenly into the furnace at 735°C and fully stir for 22 minutes, remove the scum on the surface of the molten aluminum with a rake; the amount of the slag removal agent is 0.3KG per ton of aluminum;

[0049] 3) Add Si, Fe, Cu, Mn, Mg, Cr, Zn, Zr when the melt temperature is 750℃, and stir for 20-25 minutes to mix the ingredients in the melt evenly; Si, Mg, Fe, Zn According to this ratio, and adding an appropriate amount of Cu elements can improve the mechanical properties of the material. Addin...

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PUM

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Abstract

The invention discloses a high-strength coarse-grain-ring-free aluminum alloy bar for an automotive control arm. The high-strength coarse-grain-ring-free aluminum alloy bar for the automotive control arm comprises the following components: 0.9-1.2% of Si, 0.3% of Fe, 0.15-0.2% of Cu, 0.4-0.6% of Mn, 0.7% of Mg, 0.17-0.25% of Cr, 0.15% of Zn, 0.02-0.04% of Zr and the balance of Al. By fusing, drossing, alloy preparing, refining, standing, casting, homogenizing and extruding, the finished bar is obtained finally. When the high-strength coarse-grain-ring-free aluminum alloy bar for the automotive control arm is in an extruded state, coarse grain rings do not exist, after forging and T6 heat treatment, the grain size in the center of a forge piece reaches level-one grain (inspection is carried out according to the standard of GB / T 3246.2, and the average area of the grain is smaller than or equal to 0.026 mm<2>), a coarse grain ring on the outer ring of the force piece is smaller than 2 mm, after forging and heat treatment, grains cannot be expanded easily, the mechanical property of a material can be as follows: the tensile strength is greater than or equal to 385 Mpa, the specified non-proportional extension strength is greater than or equal to 365 Mpa, and the elongation A is greater than or equal to 11%. Requirements on strength of a high-end automotive aluminum alloy steering control arm material are met.

Description

technical field [0001] The invention relates to an alloy material, in particular to a high-strength aluminum alloy bar material for an automobile control arm without coarse crystal rings and a preparation method thereof. Background technique [0002] With the lightweight design of automobiles, the use of aluminum alloys in automobiles has increased. Automobile control arms are an important component of automobile suspension systems, because control arms are safety components. Many mid-to-high-end models on the market currently use steering control arms. Aluminum alloy forgings require materials with high mechanical properties and good fatigue resistance. Mechanical properties are usually achieved by adding strength-increasing alloys to aluminum alloys in China, such as Si, Mg elements, etc. However, if the material has good fatigue resistance, the material must have a good grain structure and cannot have coarse grains or large coarse grains. Crystal rings appear, which is o...

Claims

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Application Information

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IPC IPC(8): C22C21/02C22C1/02C22F1/043
CPCC22C1/026C22C21/02C22F1/043
Inventor 史俊强
Owner JIANGSU ASIA PACIFIC LIGHT ALLOY TECH CO LTD
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