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Method for manufacturing aluminum alloy hollow section for sedan bumper

The technology of a hollow profile and a manufacturing method, which is applied in the manufacturing field of aluminum alloy hollow profiles, can solve the problems of high-grade car bumpers relying on imports, low non-proportional elongation strength, low tensile strength, etc., and achieves good flatness and mechanical properties. Stable and good formability

Active Publication Date: 2012-06-13
NORTHEAST LIGHT ALLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for manufacturing aluminum alloy hollow profiles for car bumpers, so as to solve the problems of high-end car bumpers relying on imports, low tensile strength, low non-proportional elongation strength and low safety factor of some domestic car bumpers

Method used

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Examples

Experimental program
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Effect test

specific Embodiment approach 1

[0021] Specific embodiment one: the manufacture method of the aluminum alloy hollow profile for the car bumper in the present embodiment is to carry out as follows:

[0022] 1. According to the mass percentage, Mg: 2.2%~2.8%, Cr: 0.15%~0.25%, Si≤0.25%, Fe≤0.30%, Cu: 0.05%~0.20%, Mn: 0.20%~0.50%, Zn: 4.0% to 4.8%, Ti: 0.05% to 0.18%, Zr: 0.05% to 0.15%, and the balance is the proportion of Al. Weigh aluminum alloy ingots, magnesium ingots and zinc ingots and add them to a dry melting furnace. Melting for 2.5 to 4.5 hours at a temperature of 720°C to 760°C to obtain an aluminum alloy melt;

[0023] 2. The aluminum alloy melt prepared in step 1 is cast at a casting temperature of 720°C to 735°C, a casting speed of 80mm / min to 85mm / min, a cooling water strength of 0.04MPa to 0.06MPa and a cooling water temperature of 10°C to Casting at 20°C into rods with a diameter of 172±2mm;

[0024] 3. Cut off the cast rod obtained in step 2, and the length after breaking is 500+5mm;

[002...

specific Embodiment approach 2

[0036] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 1, Mg: 1.0% to 2.8%, Cr: 0.06% to 0.35%, Si: 0.05% to 0.30%, and Fe: 0.05%~0.35%, Cu: 0.05%~0.18%, Mn: 0.05%~0.7%, Zn: 4.0%~5.0%, Ti: 0.05%~0.18%, Zr: 0.05%~0.18%, and the balance is Al The proportion of aluminum alloy ingots, magnesium ingots and zinc ingots were weighed. Other steps and parameters are the same as in the first embodiment.

[0037] In step 1 of this embodiment, the mass percentages can also be Mg: 2.3%, Cr: 0.29%, Si: 0.20%, Fe: 0.20%, Cu: 0.11%, Mn: 0.52%, Zn: 4.3%, Ti: 0.14%, Zr: 0.14% and the balance are the proportions of Al, and aluminum alloy ingots, magnesium ingots and zinc ingots are weighed.

specific Embodiment approach 3

[0038] Embodiment 3: This embodiment is different from Embodiment 1 or Embodiment 2 in that: in step 1, the melting temperature is 730° C. to 750° C., and the melting time is 3 to 4 hours. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

[0039] In step 1 of this embodiment, the melting temperature is preferably 740° C., and the melting time is preferably 3.5 hours.

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Abstract

The invention discloses a method for manufacturing an aluminum alloy hollow section for a sedan bumper, relates to a method for manufacturing an aluminum alloy hollow section, and aims to solve the problem that domestic limousine bumpers are low in tensile strength and non-proportional extension strength and dependent on import. The method comprises the following steps of: 1, preparing alloy melt; 2, casting an alloy cast rod; 3, cutting the cast rod off; 4, turning the cast rod to remove oxide; 5, performing homogenizing annealing; 6, heating a cast ingot; 7, extruding; 8, pre-straightening;9, quenching; 10, straightening; 11, aging; and 12, cutting according to length to obtain the aluminum alloy hollow section for an automobile bumper. The straightness and size of the hollow section prepared by the method completely meet the standards of imported bumpers, and the hollow section has high comprehensive mechanical properties. The method can be used for processing and manufacturing sections for limousine bumpers.

Description

technical field [0001] The invention relates to a method for manufacturing aluminum alloy hollow profiles. Background technique [0002] At present, imported materials have been used for aluminum alloy hollow profiles for the bumpers of high-end cars in my country, and the materials are expensive; some domestic car bumpers have low tensile strength, low non-proportional extension strength, low safety factor, and high safety factor car bumpers Not for use by the general public. Contents of the invention [0003] The purpose of the present invention is to provide a method for manufacturing aluminum alloy hollow profiles for car bumpers, so as to solve the problems of high-end car bumpers relying on imports, low tensile strength, low non-proportional elongation strength and low safety factor of some domestic car bumpers . [0004] The manufacturing method of aluminum alloy hollow profiles for car bumpers is carried out as follows: [0005] 1. According to the mass percentag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00C22C21/10C22F1/053
Inventor 宋微马琳王丽薇冯正海刘记伟
Owner NORTHEAST LIGHT ALLOY CO LTD
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