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Aluminum alloy splicing welding plate forming technology

A technology for forming and processing aluminum alloy sheets, which is applied in the field of material processing, can solve the problems of AGG, many times of heating, and long holding time in welds, etc., to simplify the traditional hot stamping process, reduce deformation resistance and springback, The effect of improving formability

Active Publication Date: 2018-10-16
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of many times of heating, long holding time, large energy consumption, low production efficiency and AGG of weld seam due to welding-solid solution-stamping-quenching-aging-trimming in the existing aluminum alloy tailor welding forming process, The invention provides a forming process of aluminum alloy tailored welded blanks, which adopts age-hardened aluminum alloy sheets as raw materials, and obtains finished products through welding-short-time heat preservation-stamping-cooling-trimming-machining, because there is no need for traditional The long-term solid solution heat preservation treatment of hot stamping does not require time-consuming age hardening treatment after forming, which greatly simplifies the traditional hot stamping process, improves production efficiency, reduces costs, and avoids the occurrence of AGG at the same time, and because the weld seam after stamping is completed The cooling rate is greater than that of the base metal, which can make the overall strength of the stamping parts more uniform and meet the requirements of use

Method used

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  • Aluminum alloy splicing welding plate forming technology
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  • Aluminum alloy splicing welding plate forming technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Tailor welding and forming of 2024 aluminum alloy plates by the present invention comprises the following steps:

[0045] The first step is to carry out friction stir welding of two 2024 aluminum alloy plates, the welding speed is 100mm / min, and the rotation speed of the stirring head is 800r / min;

[0046]The second step is to put the plates obtained after welding in the first step into the furnace for heat preservation, the temperature is 450°C, and the heat preservation time is 5 minutes;

[0047] The third step is to quickly transfer the heat-preserved tailored welded blank to the stamping die for stamping treatment, and quench and hold the pressure in the die for 10 seconds;

[0048] The fourth step is to perform cold trimming on the stamped sheet;

[0049] The fifth step is to carry out machining to obtain the finished product.

Embodiment 2

[0051] Adopting the present invention to carry out tailor welding forming to 7075 aluminum alloy plate, comprises the following steps:

[0052] The first step is to carry out friction stir welding of two 7075 aluminum alloy plates, the welding speed is 100mm / min, and the rotation speed of the stirring head is 800r / min;

[0053] The second step is to put the plates obtained after welding in the first step into the furnace for heat preservation, the temperature is 300 ° C, and the heat preservation time is 5 minutes;

[0054] The third step is to quickly transfer the heat-preserved tailored welded blank to the stamping die for stamping treatment, and quench and hold the pressure in the die for 10 seconds;

[0055] The fourth step is to perform cold trimming on the stamped sheet;

[0056] The fifth step is to carry out machining to obtain the finished product.

Embodiment 3

[0058] Tailor welding and forming of 7075 and 2024 heterogeneous aluminum alloy plates using the present invention comprises the following steps:

[0059] The first step is to perform friction stir welding of 7075 and 2024 aluminum alloy plates, wherein 7075 is placed on the forward side, 2024 is placed on the backward side, the welding speed is 50mm / min, and the rotation speed of the stirring head is 1000r / min;

[0060] The second step is to put the plates obtained after welding in the first step into the furnace for heat preservation, the temperature is 350°C, and the heat preservation time is 5 minutes;

[0061] The third step is to quickly transfer the heat-preserved tailored welded blank to the stamping die for stamping treatment, and quench and hold the pressure in the die for 10 seconds;

[0062] The fourth step is to perform cold trimming on the stamped sheet;

[0063] The fifth step is to carry out machining to obtain the finished product.

[0064] From the above th...

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Abstract

The invention discloses an aluminum alloy splicing welding plate forming technology by friction stir welding. The technology comprises the following steps that S1, at least two aging hardening state aluminum alloy plates are subjected to friction stir welding; S2, a splicing welding plate is placed in a heating furnace to be subjected to short-time insulation treatment with the holding temperaturelower than the abnormal grain growth temperature of a joint welding joint; S3, the splicing welding plate is rapidly transferred to a stamping die after the insulation treatment and is subjected to stamping forming, and quenching pressure maintaining in a stamping die; S4, the stamped splicing welding plate is subjected to trimming treatment after cooling; and S5, the cut splicing welding plate is subjected to machining treatment and thus a finished product is obtained. A traditional hot stamping technology is simplified greatly, the production efficiency is improved, the cost is lowered, AGGis avoided and the strength of a stamped part is ensured.

Description

technical field [0001] The invention belongs to the technical field of material processing, and in particular relates to a heat treatment-strengthened aluminum alloy tailor welded blank forming process for automobiles. Background technique [0002] With the intensification of energy crisis and environmental pollution, lightweight has become the development trend of automobile manufacturing, and the application of aluminum alloy materials is an important way to realize the lightweight of automobiles. Aluminum alloy tailor welding forming technology is to weld several aluminum alloy sheets of the same or different materials, thicknesses, coatings, etc. Advantages such as the production of ultra-wide panels are considered to be an effective production method for lightweight vehicles. In the manufacturing process of tailor-welded blanks, because aluminum alloys are difficult-to-weld metals, traditional welding methods are prone to defects such as pores and cracks when welding a...

Claims

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Application Information

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IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 胡志力张嘉恒华林
Owner WUHAN UNIV OF TECH
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