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A Processing Technology for Precise Forming of Hemispherical Body of Large Thin-wall Storage Tank

A technology of precision forming and processing technology, which is applied in the field of precision forming processing technology of large thin-walled storage tank hemispheres. It can solve problems such as difficult measurement and clamping, easy instability, wrinkling and cracking of flange parts, and achieve improvement. The effect of processing difficulty

Active Publication Date: 2021-08-27
贵州航天朝阳科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the prior art, the material of the upper and lower hemispheres of the storage tank is aluminum alloy (5A06), which has a small elongation and serious work hardening phenomenon, and is easily broken during stretch forming; the diameter of the upper and lower hemispheres reaches 930mm, and the , the flange part is easily unstable and wrinkled, which seriously affects the forming performance of the inner cavity
High-precision thin-walled spherical parts for the upper and lower hemispheres of the storage tank If the diameter is larger than φ925, it is difficult to control the wall thickness and shape during processing, and it is difficult to realize measurement and clamping by ordinary methods

Method used

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  • A Processing Technology for Precise Forming of Hemispherical Body of Large Thin-wall Storage Tank
  • A Processing Technology for Precise Forming of Hemispherical Body of Large Thin-wall Storage Tank
  • A Processing Technology for Precise Forming of Hemispherical Body of Large Thin-wall Storage Tank

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Experimental program
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Effect test

Embodiment 1

[0048] Such as figure 1 , figure 2 , image 3 As shown, a processing technology for precision forming of a large thin-walled storage tank hemisphere, including plasma gas cutting, stamping forming, cutting, shaping, finishing the inner spherical surface, finishing the outer spherical surface, and surface treatment steps, specifically includes the following steps:

[0049] (1) Plasma gas cutting: first calculate the size of the blank, then use plasma gas cutting equipment to cut the outer circle, and then punch the blank and cut it;

[0050] (2) Stamping forming: Grinding and cleaning with a pneumatic grinding wheel. Steps (1) The cutting slag on the edge of the billet cut by plasma gas, and then using a 2000T hydraulic drawing forming die and an aluminum alloy special annealing furnace to repeat drawing forming and annealing four times. Then carry out the fifth drawing forming to obtain the hemispherical semi-finished product;

[0051] Using 2000T hydraulic drawing forming...

Embodiment 2

[0060] Such as figure 1 , figure 2 , image 3 As shown, a processing technology for precision forming of a large thin-walled storage tank hemisphere, including plasma gas cutting, stamping forming, cutting, shaping, finishing the inner spherical surface, finishing the outer spherical surface, and surface treatment steps, specifically includes the following steps:

[0061] (1) Plasma gas cutting: first calculate the size of the blank, then use plasma gas cutting equipment to cut the outer circle, and then punch the blank and cut it;

[0062] (2) Stamping forming: Grinding and cleaning with a pneumatic grinding wheel. Steps (1) Cut slag on the edge of the billet cut by plasma gas, and then use a 2000T hydraulic drawing forming die and an aluminum alloy special annealing furnace to repeat drawing forming and annealing four times. Then carry out the fifth drawing forming to obtain the hemispherical semi-finished product;

[0063] Using 2000T hydraulic drawing forming die and a...

Embodiment 3

[0072] Such as figure 1 , figure 2 , image 3 As shown, a processing technology for precision forming of a large thin-walled storage tank hemisphere, including plasma gas cutting, stamping forming, cutting, shaping, finishing the inner spherical surface, finishing the outer spherical surface, and surface treatment steps, specifically includes the following steps:

[0073] (1) Plasma gas cutting: first calculate the size of the blank, then use plasma gas cutting equipment to cut the outer circle, and then punch the blank and cut it;

[0074] (2) Stamping forming: Grinding and cleaning with a pneumatic grinding wheel. Steps (1) The cutting slag on the edge of the billet cut by plasma gas, and then using a 2000T hydraulic drawing forming die and an aluminum alloy special annealing furnace to repeat drawing forming and annealing four times. Then carry out the fifth drawing forming to obtain the hemispherical semi-finished product;

[0075] Using 2000T hydraulic drawing forming...

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Abstract

The invention discloses a processing technology for precise forming of a hemispherical body of a large thin-walled storage tank, which comprises the steps of plasma gas cutting, stamping forming, cutting, shaping, finishing the inner spherical surface, finishing the outer spherical surface and surface treatment. The hemispherical diameter of the large thin-walled storage tank in this application is φ925, the wall thickness is φ0.3, and the ellipticity is φ0.3. The diaphragm type storage tank has high requirements for size, and it is very difficult to CNC process, especially the material used is aluminum alloy, which has insufficient strength and rigidity. , the processing deformation is large, the processing is difficult, and because the diaphragm tank is a large-diameter hemisphere, the surface line speed changes with the height of the part. When turning, it is necessary to select different spindle speeds for different rings to further improve This application explores the use of ultrasonic measurement and design and manufacture of special tooling expansion and clamping for CNC machining, the wall thickness tolerance ellipticity of the upper and lower hemispheres of the storage tank is Φ0.3, and the tensile strength after heat treatment is σ b ≥340MPa, elongation greater than 10%.

Description

technical field [0001] The invention belongs to the technical field of storage tank manufacturing, and in particular relates to a processing technology for precise forming of a hemisphere of a large thin-walled storage tank. Background technique [0002] As the main pressure vessel of the aerospace power system, the tank is used to store liquid media (such as propellants, etc.), carry a certain pressure, and realize functions such as pressure supply. The performance of the tank directly affects the service life and reliability of the spacecraft. sex. According to different structures and working principles, storage tanks are mainly divided into surface tension storage tanks, diaphragm storage tanks, capsule storage tanks, membrane box storage tanks, etc. Regardless of the storage tank, the shell is the main load-bearing part , its structure and performance directly affect the performance of the tank. At present, the diameter of most of the large thin-walled rotary parts pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 唐元超刘忠刘头明胡平方成鑫
Owner 贵州航天朝阳科技有限责任公司
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