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Ellipsoid air pressure forming method based on electric current self-resistance heating

An air pressure and ellipsoid technology, which is applied to non-electric welding equipment, arc welding equipment, metal processing equipment, etc., can solve the problems of difficulty in realizing large-scale heating furnace without mold pressure forming, high technical risks, and high equipment cost, and is conducive to high efficiency. and uniform heating, optimized layout, improved formability

Active Publication Date: 2019-06-21
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For a large-diameter ellipsoid (such as a diameter greater than 3m, or even 10m), if the method of heating in a heating furnace is used, not only a large-sized heating furnace is required, the equipment cost is extremely high, and the temperature uniformity of the large-sized heating furnace needs to be checked. Strict control, very high technical risk, it is difficult to realize moldless air pressure forming in a large-size heating furnace

Method used

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  • Ellipsoid air pressure forming method based on electric current self-resistance heating
  • Ellipsoid air pressure forming method based on electric current self-resistance heating
  • Ellipsoid air pressure forming method based on electric current self-resistance heating

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Embodiment 1

[0034] figure 1 It is a schematic diagram of the closed polyhedral shell structure of the embodiment of the present invention, such as figure 1 As shown, this embodiment provides an aluminum alloy ellipsoid air pressure forming method based on current self-resistance heating. The closed multi-faced shell is assembled and welded by current self-resistance heating plate 1 and ellipsoid side shell plate 2. Welds 3 are formed between the shell plates of the two ellipsoidal side petals to improve the plasticity of the aluminum alloy and the welded joints, and the multi-faced shell is formed into an ellipsoid by pressurizing the multi-faceted shell at high temperature.

[0035] figure 2 It is a flow chart of the method for forming an ellipsoid by air pressure in an embodiment of the present invention, as figure 2 Shown, the ellipsoid air pressure forming method provided by the invention, concrete steps are as follows:

[0036] Step 1. Obtain two polar plates and multiple ellips...

Embodiment 2

[0052] combine Figure 1-5 To illustrate, this embodiment provides a method for air pressure forming of an aluminum alloy ellipsoid based on current self-resistance heating. It does not use a heating furnace, and the multi-faceted shell is heated by current self-resistance to improve the plasticity of the aluminum alloy and the welded joint. Pressing shapes the faceted shell into an ellipsoid. Among them, the material of the pole plate and the ellipsoid side shell plate is 2219 aluminum alloy plate with a thickness of 8.0mm; the diameter of the major axis of the ellipsoid is 3350mm, and the axial length ratio is 1.4. The ellipsoid air pressure forming method that the present embodiment provides, concrete steps are as follows:

[0053] Step 1: Obtain two polar plates 1 and multiple ellipsoid side valve shell plates 2 according to the preset axial length ratio.

[0054] According to the axial length ratio of 1.4, two polar plates and multiple ellipsoidal side lobes are obtaine...

Embodiment 3

[0064] combine Figure 1-5 To illustrate, this embodiment provides a method for air pressure forming of an aluminum alloy ellipsoid based on current self-resistance heating. The multi-face shell is heated by current self-resistance to improve the plasticity of the aluminum alloy and the welded joint. At high temperature, compressed gas is used to pressurize the multi-face shell The body is shaped like an ellipsoid. Among them, the material of the pole plate and the ellipsoid side shell plate is 6061 aluminum alloy plate with a thickness of 8.0mm; the diameter of the major axis of the ellipsoid is 5500mm, and the axial length ratio is 1.4. Different from the second embodiment, this embodiment optimizes the arrangement of electrodes in the central region of the side lobe (equatorial zone) and the pole plate, forming multiple closed current loops, and achieving efficient and uniform heating of the closed multi-faceted shell. Ellipsoid air pressure forming method provided by the ...

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Abstract

The invention discloses an ellipsoid air pressure forming method. The plasticity of an aluminum alloy and a welded joint is improved through an electric current self-resistance heating shell, and compressed gas is used for pressurizing the sealed multi-face shell to form an ellipsoid under the heating condition. In specific, two polar plates and ellipsoid side lobe shell plates are assembled and welded to form the closed multi-face shell; electrodes are arranged on the closed multi-faceted shell, energizing and heating to a preset temperature, and introducing a compressed gas into the shell; the closed multi-face shell, electrification is carried out for heating to the preset temperature, and then the compressed gas is led into the shell; and the closed multi-face shell deforms under the action of internal gas pressure, leading of the gas is stopped until the shell with the desired curvature is obtained, the gas is discharged, the electrodes are removed, and the formed ellipsoid is obtained. According to the ellipsoid air pressure forming method, an electric current self-resistance heating manner is adopted, a large-sized heating furnace is prevented from being used, and the manufacturing cost and the technical risk of the large-diameter ellipsoid are greatly reduced; and an aluminum alloy base material and the welded joint are subjected to air pressure bulging under the heating state, the forming property is remarkably improved, and the problem of cracking of a welded zone during normal temperature forming of the large-diameter aluminum alloy ellipsoid is solved.

Description

technical field [0001] The invention relates to the technical field of ellipsoid forming, in particular to an ellipsoid air pressure forming method based on current self-resistance heating. Background technique [0002] Ellipsoidal containers are widely used in thin-walled containers such as large water towers, petrochemical containers, and cylindrical container heads because of their advantages such as low center of gravity, uniform force, and high load-carrying capacity. With the improvement of lightweight requirements, large-diameter aluminum alloy ellipsoids with high specific strength and good corrosion resistance have gradually been widely used, such as the aluminum alloy ellipsoid bottom of the launch vehicle fuel storage tank, and the aluminum alloy ellipsoid bottom of the upper stage fuel storage tank. , Marine liquefied gas aluminum alloy storage tanks, etc. [0003] Traditional ellipsoid container forming usually adopts the method of firstly molding the petals an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D51/18B21D26/053
CPCB23K2103/10B23K26/30B23K20/122B23K9/032B21D51/18B21D26/033B21D51/08B23K26/26B23K9/025B23K20/129
Inventor 苑世剑凡晓波
Owner DALIAN UNIV OF TECH
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