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Integral die forging forming method for spherical shell of manned cabin of titanium alloy bathyscaph

A technology for deep submersibles and manned cabins, applied in metal processing equipment, forging/pressing/hammer devices, forging/pressing/hammering machinery, etc. , hardness, low wear resistance, difficulty in meeting deep-diving strength and other issues, to achieve the effect of reducing welding risk, satisfying structure and performance, and reducing overall production cost

Pending Publication Date: 2022-04-01
中国第二重型机械集团德阳万航模锻有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the hemisphere is integrally stamped and formed, and the connection between each lookout hole and the hemisphere is welded, it is extremely difficult due to the high strength, large thickness, and long weld seam of the titanium alloy. The weld seam in the entire spherical shell structure becomes a weak link, and it is difficult to meet deep Potential Strength Requirements
[0003] CN201711349281.1 discloses a method for preparing aluminum alloy die forgings for high-pressure shells used in submersibles. The strength, hardness, and wear resistance of aluminum alloys are far lower than those of titanium alloys. This die forging process is only suitable for aluminum alloys. , cannot be used in the manufacture of spherical shells of deep submersible manned cabins made of titanium alloy

Method used

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  • Integral die forging forming method for spherical shell of manned cabin of titanium alloy bathyscaph
  • Integral die forging forming method for spherical shell of manned cabin of titanium alloy bathyscaph
  • Integral die forging forming method for spherical shell of manned cabin of titanium alloy bathyscaph

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Experimental program
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Effect test

Embodiment 1

[0039] Design the forging drawing: on the basis of the part drawing, increase the machining allowance according to the shape, and the machining allowance on one side is 8mm. The design draft angle is 7°, so that the forging can be released from the mold smoothly. The outer contour size of the forging is 1370mm×1225mm×657mm, and the horizontal net projected area is 1.228m 2 , The forging weight is 890Kg.

[0040] Upsetting: Ti62A titanium alloy rod blanking, preheating the upper and lower anvils, the preheating time is 2 hours, the preheating temperature is 200°C, and the bar is heated to Tβ-(30~35°C), at Tβ-(30 ~35°C) temperature, holding time 0.8min / mm. Carry out 4-fire upsetting, the pressing amount of each fire upsetting is 40%, and the pressing speed is 20mm / s. The size of the blank after upsetting is φ1170mm×200mm, and the weight is 990Kg. When upsetting each fire, cover the upper and lower surfaces of the blank with insulation cotton to reduce the heat dissipation rat...

Embodiment 2

[0047] Design the forging drawing: on the basis of the part drawing, increase the machining allowance according to the shape, and the machining allowance on one side is 8mm. The design draft angle is 7°, so that the forging can be released from the mold smoothly. The outer contour size of the forging is 1370mm×1225mm×657mm, and the horizontal net projected area is 1.228m 2 , The forging weight is 890Kg.

[0048] Upsetting: Ti62A titanium alloy rod blanking, preheating the upper and lower anvils, the preheating time is 2 hours, the preheating temperature is 200°C, and the bar is heated to Tβ-(35~40°C), at Tβ-(35 ~40°C) temperature, holding time 0.9min / mm. Carry out 4-fire upsetting, the pressing amount of each fire upsetting is 35%, and the pressing speed is 20mm / s. The size of the blank after upsetting is φ1170mm×200mm, and the weight is 990Kg. When upsetting each fire, cover the upper and lower surfaces of the blank with insulation cotton to reduce the heat dissipation rat...

Embodiment 3

[0055] Design the forging drawing: on the basis of the part drawing, increase the machining allowance according to the shape, and the machining allowance on one side is 8mm. The design draft angle is 7°, so that the forging can be released from the mold smoothly. The outer contour size of the forging is 1370mm×1225mm×657mm, and the horizontal net projected area is 1.228m 2 , The forging weight is 890Kg.

[0056] Upsetting: Ti62A titanium alloy rod blanking, preheating the upper and lower anvils, the preheating time is 2 hours, the preheating temperature is 200°C, and the bar is heated to Tβ-(40~45°C), at Tβ-(40 ~45°C) temperature, holding time 1min / mm. Carry out 4-fire upsetting, the pressing amount of each fire upsetting is 30%, and the pressing speed is 15mm / s. The size of the blank after upsetting is φ1170mm×200mm, and the weight is 990Kg. When upsetting each fire, cover the upper and lower surfaces of the blank with insulation cotton to reduce the heat dissipation rate....

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Abstract

The invention provides an integral die forging forming method for a spherical shell of a manned cabin of a titanium alloy bathyscaph. The integral die forging forming method comprises the steps that a forge piece drawing is designed; a bar is blanked, and the bar is subjected to multiple times of upsetting; the forging temperature is T beta-(30-50 DEG C), and the deformation amount is 30%-55%; the forging temperature is T beta + (5-30 DEG C), and the deformation amount is 20%-50%; the forging temperature is T beta-(30-50 DEG C), and the deformation is 10%-20%; and heat treatment. The bathyscaph manned cabin spherical shell with the three outlook holes is integrally formed in a die forging mode, welding seams are eliminated, the welding risk and the overall production cost are reduced, the connection strength between the outlook holes and the spherical shell is guaranteed, and weak links are prevented.

Description

technical field [0001] The invention relates to the technical field of manufacturing a spherical shell of a manned cabin of a submersible, in particular to an integral die forging forming method for a spherical shell of a manned cabin of a titanium alloy deep submersible. Background technique [0002] The lower half of the spherical shell of the manned cabin of the deep submersible is as follows: figure 1 As shown, the manufacturing difficulty lies in the formation of multiple lookout holes on the spherical shell. Due to the relatively large outline size and thickness of the spherical shell of the manned cabin of the deep submersible, the shape is irregular, the forging parameters are difficult to determine, and the die forging is difficult. Therefore, the manned cabins of the world's mainstream deep submersibles are generally formed by stamping, and the connection between each lookout hole and the hemisphere is processed by welding, or the method of melon petal tailor weldi...

Claims

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Application Information

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IPC IPC(8): B21J5/02B21J13/02B21J13/08
Inventor 龚彬闵武魏明刚熊运森曾菁莫安军余胜峰栗文强雷家峰
Owner 中国第二重型机械集团德阳万航模锻有限责任公司
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