Solution treatment and granular medium cold forming method for high-strength aluminum alloy pipe fitting

A solid solution treatment and granular medium technology, applied in heat treatment furnaces, heat treatment equipment, improvement of process efficiency, etc., can solve problems such as poor stability and low strength of formed pipe fittings, and achieve low hardness, low investment cost, and low energy consumption. Effect

Active Publication Date: 2016-09-28
YANSHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At this time, the formed pipe has low strength and poor stability, which can be compensated for by artificial aging

Method used

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  • Solution treatment and granular medium cold forming method for high-strength aluminum alloy pipe fitting
  • Solution treatment and granular medium cold forming method for high-strength aluminum alloy pipe fitting
  • Solution treatment and granular medium cold forming method for high-strength aluminum alloy pipe fitting

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Effect test

Embodiment 1

[0023] The high-strength aluminum alloy pipe fitting solid particle medium cold expansion forming method of the present invention is as follows, as figure 1 Shown:

[0024] (1) First cut the AA6061 extruded pipe to make a pipe blank, such as image 3 As shown, put it into a box-type heating furnace for solid solution treatment, the heating temperature is generally 560 ° C, the holding time is 2 hours, water quenching after the treatment, the transfer time is 4 seconds, and the water temperature is 25 ° C. In order to avoid the influence of natural aging, The treated tube blank needs to be stored at -10°C low temperature, such as Figure 4 shown;

[0025] (2) The tube blank after solid solution treatment is subjected to high pressure bulging in the granular medium at room temperature, the outer wall of the tube blank is wrapped with polytetrafluoroethylene for lubrication, the tube blank is put into the mold, filled with granular medium, and the mold is installed The indente...

Embodiment 2

[0028] The high-strength aluminum alloy pipe fitting solid particle medium cold expansion forming method of the present invention is as follows, as figure 1 Shown:

[0029] (1) First cut the AA7075 extruded pipe to make a pipe blank, and put it into a box-type heating furnace for solid solution treatment. The heating temperature is generally 470°C, and the holding time is 1.5h. After the treatment, it is quenched in water and the transfer time is 3s. ,, the water temperature is 25°C, in order to avoid the influence of natural aging, the treated tube blanks need to be stored at -15°C, such as Figure 5 shown;

[0030] (2) The tube blank after solid solution treatment is subjected to high pressure bulging in the granular medium at room temperature, the outer wall of the tube blank is wrapped with polytetrafluoroethylene for lubrication, the tube blank is put into the mold, filled with granular medium, and the mold is installed The indenter and the gland are closed until they c...

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Abstract

Disclosed is a solution treatment and granular medium cold forming method for a high-strength aluminum alloy pipe fitting. Forming of complex parts from a high-strength aluminum alloy extruded pipe at a room temperature is realized through the process of solution treatment, granular medium pressure forming and artificial aging. The process is easy and convenient to control, the input cost is low, product design is flexible, energy consumption is low, production efficiency is high, the size of a target workpiece is precise, and high use strength and stability are achieved. After a pipe blank is subjected to solution treatment, the strength and hardness are lowered, the plasticity is remarkably improved, parts in complex shapes can be formed only at the room temperature, and the bearing capacity requirement for equipment is low. The strength of the formed pipe fitting is low, the strength of the pipe fitting can be recovered to the original state through artificial aging, and the service life of the target pipe fitting is prolonged. Solid granular media are stable in chemical property, environmentally friendly, free of pollution and reusable, and have the characteristic of uneven distribution of internal pressure, and the use strength of the formed pipe fitting is guaranteed while the plastic processing capacity of the pipe blank is improved.

Description

technical field [0001] The invention relates to a method for solid solution treatment and cold expansion of granular media. Background technique [0002] With the continuous development of the level of science and technology, in the technical fields of aerospace, automobile industry and petrochemical industry, it is constantly required to reduce the weight, high strength and high efficiency of parts and components. The light-weight structural features of high-strength aluminum alloy tubular members such as integration, thin shells, and hollow variable cross-sections are meeting the needs of technological development. At the same time, key components are often used in extremely harsh environments. High-strength aluminum alloy materials have become the material of choice for key components due to their low density, high strength, high hardness, heat resistance, wear resistance, and corrosion resistance. High-strength aluminum alloy materials mainly include 6xxx aluminum alloy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/06B21D26/033C22F1/04C21D9/08
CPCB21C37/06B21D26/033C21D9/08C22F1/04Y02P10/20
Inventor 董国疆赵长财毕江
Owner YANSHAN UNIV
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