CN-121988991-A - Manufacturing method of spherical separation shell of double-spherical titanium alloy manned cabin

CN121988991ACN 121988991 ACN121988991 ACN 121988991ACN-121988991-A

Abstract

The invention discloses a manufacturing method of a spherical separation shell of a double-spherical titanium alloy manned cabin, and belongs to the technical field of forging. The double-ball structure is divided into a first ball shell, a second ball shell, a third ball shell and a fourth ball shell through the first dividing surface, the second dividing surface and the third dividing surface, wherein the cabin door and the observation window are respectively and completely positioned on the first ball shell and the fourth ball shell, and the second ball shell and the third ball shell are completely identical. Each spherical shell takes the dividing surface as a parting surface to design a forging piece, and a circumferential boss is arranged at the bowl opening. And for the spherical shell forging with the half cambered surface and the half inclined surface, the second positioning structure is adopted for die forging, so that accurate positioning and forming are ensured. Finally, removing the boss through machining and welding for forming. The invention reduces single forging tonnage, reduces weld length, avoids weld at key structure, improves the integral strength and reliability of the manned cabin, and saves the die cost.

Inventors

ZHANG WENXIANG
CHEN HANYANG
XU WENLI
Lv Xiaogen
Xiao jijin
XIONG YUNSEN
MO ANJUN
DENG HAO
MA YINGJIE
YIN HUI
HE RUI

Assignees

中国第二重型机械集团德阳万航模锻有限责任公司

Dates

Publication Date: 20260508
Application Date: 20260323

Claims (6)

1. The manufacturing method of the spherical separation shell of the double-spherical titanium alloy manned cabin is characterized by comprising the following steps of: S1, dividing a double-ball structure according to a first dividing surface (1), a second dividing surface (2) and a third dividing surface (3), wherein the first dividing surface (1) and the second dividing surface (2) pass through the centers of two balls respectively, the third dividing surface (3) passes through the midpoints of connecting lines of the centers of the two balls, the included angles of the first dividing surface (1), the second dividing surface (2) and the third dividing surface (3) with a horizontal plane are respectively theta 1 、θ 2 、θ 3 , wherein theta 1 ＝θ 2 ≤60°,θ 3 = 90 degrees, the double-ball structure is divided into a first ball shell (4), a second ball shell (5), a third ball shell (6) and a fourth ball shell (7), the cabin door structure is positioned on the first ball shell (4), the observation window structure is positioned on the fourth ball shell (7), and the second ball shell (5) and the third ball shell (6) are completely identical; S2, designing a spherical shell forging structure according to the segmented spherical shells, wherein the first spherical shell (4) and the fourth spherical shell (7) are spherical shells with complete cambered surfaces, the second spherical shell (5) and the third spherical shell (6) are spherical shells with half cambered surfaces and half inclined surfaces, the segmented surface of each spherical shell is used as a parting surface, a circumferential boss (8) is arranged on the periphery of a spherical shell bowl opening, the radius of the circumferential boss (8) is 80-100mm larger than that of the spherical shell, and the thickness of the circumferential boss is 50-80mm, so that the spherical shell forging with complete cambered surfaces and the spherical shell forging with half cambered surfaces and half inclined surfaces are formed; S3, performing die forging positioning on the spherical shell forging with the complete cambered surface by adopting a first positioning structure, wherein the first positioning structure comprises a first positioning groove (10) arranged on a push rod of a first male die (9), a first positioning boss (12) matched with the first positioning groove (10) is arranged on a first cake blank (11), when in die forging, the first male die (9) is arranged below in the firing time before the Nth fire, the first female die is arranged above, the first cake blank (11) is arranged on the first male die (9), the first positioning boss (12) is arranged in the first positioning groove (10), the first female die is driven to move downwards by a press, the first female die is arranged below in the firing time after the Nth fire and the Nth fire, the first male die (9) is started to drive the first male die (9) to move downwards, the spherical shell forging with the complete cambered surface is completed; S4, performing die forging positioning on the spherical shell forging with the half-cambered surface and half-inclined surface by adopting a second positioning structure, wherein the second positioning structure comprises a second positioning groove (14) arranged in a cavity of a second female die (13), when in die forging, the second female die (13) is arranged below, a second male die is arranged above, a second cake blank (15) is arranged in the second female die (13), the second cake blank (15) falls into the second positioning groove (14) of the cavity of the second female die (13), a press is started to drive a second male die to move downwards, so that the forging of the spherical shell forging with the half-cambered surface and half-inclined surface is completed, and after the forging is completed, a push rod arranged on the second female die (13) pushes up the spherical shell forging with the half-cambered surface and half-inclined surface, and then a clamping machine is used for clamping a circumferential boss (8), so that the spherical shell forging with the half-cambered surface is taken out; S5, removing circumferential bosses (8) of spherical shell forging pieces with complete cambered surfaces and spherical shell forging pieces with semi-inclined surfaces in a machining mode, finishing the surfaces of the spherical shell forging pieces to obtain a first spherical shell (4), a second spherical shell (5), a third spherical shell (6) and a fourth spherical shell (7), and welding the first spherical shell (4), the second spherical shell (5), the third spherical shell (6) and the fourth spherical shell (7) to form the double-spherical titanium alloy manned cabin.
2. The method for manufacturing the spherical shell of the double-ball titanium alloy manned capsule according to claim 1, wherein in the step S3, at least one side surface of each of the first positioning groove (10) and the first positioning boss (12) is a plane, and when the die forging is performed, the plane of the first positioning boss (12) is matched with the plane of the first positioning groove (10).
3. The manufacturing method of the spherical separation shell of the double-ball titanium alloy manned cabin according to claim 1 or 2, wherein in the step S3, the diameter phi of the ejector rod head of the first male die (9) is larger than or equal to 200mm and larger than or equal to D 1 and larger than or equal to 165mm, the diameter D 2 ＝1/2×D 1 of the first positioning groove (10), the depth 70mm of the first positioning groove (10) is larger than or equal to H 1 and larger than or equal to 50mm, and the diameter D 3 ＝D 2 and the height H 2 ＝H 1 of the first positioning boss (12) are all the same.
4. The method for manufacturing a spherical shell of a double-ball titanium alloy passenger compartment according to claim 1, wherein in step S3, deformation of the forging piece at each firing time is controlled to be 20% -60% through numerical simulation of the DEFORM, and flash formation is determined to be started at the nth firing time.
5. The method for manufacturing the spherical shell of the double-ball titanium alloy manned capsule according to claim 1, wherein in the step S4, after the second biscuit (15) is placed in the cavity of the second die (13), the upper surface of the second biscuit (15) is higher than the upper surface of the second die (13), and the distance H 4 = 50-100mm between the upper surface of the second biscuit (15) and the upper surface of the second die (13).
6. The method for manufacturing a spherical shell of a double-ball titanium alloy manned capsule according to claim 5, wherein in the step S4, the deformation amount of each firing time during die forging is controlled to be 25% -55% through DEFORM numerical simulation, the diameter D 4 and the thickness H 3 of the second biscuit (15) are determined, the position of the second positioning groove (14) in the cavity of the second female die (13) is determined according to the diameter D 4 and the thickness H 3 of the blank, and the diameters D 5 ＝D 4 +d and D of the second positioning groove (14) are 10-20mm.

Description

Manufacturing method of spherical separation shell of double-spherical titanium alloy manned cabin Technical Field The invention relates to the technical field of forging, in particular to a manufacturing method of a spherical separation shell of a double-spherical titanium alloy manned cabin. Background The double-ball titanium alloy manned cabin is a new concept manned submersible independently developed in China, and as shown in fig. 1, the whole double-ball titanium alloy manned cabin is of a double-ball structure, three observation windows are arranged on one side of the ball body, a cabin door is arranged on the other side of the ball body, the outer diameter of a single ball body is larger than 900mm, the whole volume is larger, and the section thickness is uneven. Aiming at the double-ball titanium alloy manned cabin with the structure, the conventional manufacturing method is that melon petals are formed by welding, a submersible is divided into a plurality of melon petals, and finally the melon petals are welded. The welding lines are weak links of the submersible, but the manufacturing mode has more welding lines, namely, a plurality of welding lines exist in the whole submersible sphere by split welding forming of the melon petals, and secondly, in the split process, the observation window or the cabin door is divided, so that the number of the welding lines is large, and the welding lines are unavoidable in a main bearing structure of the submersible sphere. Under extreme deep sea pressure, with the increase of submergence depth and submergence operation time, stress concentration is more likely to occur at the welding seam, the pressure bearing limit of the whole submersible is reduced, and the method is difficult to meet the performance requirement of working under the extreme deep sea environment. Disclosure of Invention The invention aims to solve the technical problem of providing a method for manufacturing a spherical shell of a double-spherical titanium alloy manned cabin, which improves the performance of the spherical shell of the double-spherical titanium alloy manned cabin. The technical scheme adopted by the invention for solving the technical problems is a method for manufacturing a spherical separation shell of a double-spherical titanium alloy manned cabin, which comprises the following steps: S1, dividing the double-ball structure according to a first dividing surface, a second dividing surface and a third dividing surface, wherein the first dividing surface and the second dividing surface pass through the centers of two balls respectively, the third dividing surface passes through the midpoints of connecting lines of the centers of the two balls, and the included angles of the first dividing surface, the second dividing surface and the third dividing surface and a horizontal plane are respectively theta 1、θ2、θ3, wherein the theta 1＝θ2≤60°,θ3 is less than or equal to 25 degrees = 90 degrees; s2, designing a spherical shell forging structure according to the segmented spherical shells, wherein the first spherical shell and the fourth spherical shell are spherical shells with complete cambered surfaces, and the second spherical shell and the third spherical shell are spherical shells with half cambered surfaces and half inclined surfaces; S3, performing die forging positioning on the spherical shell forging with the complete cambered surface by adopting a first positioning structure, wherein the first positioning structure comprises a first positioning groove arranged on a push rod of a first male die, a first positioning boss matched with the first positioning groove is arranged on a first cake blank, during die forging, in the firing time before the Nth fire, the first male die is arranged below, a first female die is arranged above, the first cake blank is arranged on the first male die, the first positioning boss is arranged in the first positioning groove, the first female die is driven to move downwards by a press, in the firing time after the Nth fire and the N fire, the first female die is arranged below, the first male die is arranged above, the press is started to drive the first male die to move downwards, so that the spherical shell forging with the complete cambered surface is completed; S4, performing die forging positioning on the spherical shell forging with the half cambered surface and the half inclined surface by adopting a second positioning structure, wherein the second positioning structure comprises a second positioning groove arranged in a second female die cavity; during die forging, a second female die is arranged below, a second male die is arranged above, and a second cake blank is arranged in the second female die, so that the second cake blank falls into a second positioning groove of a second female die cavity; after the forging is finished, the ejector rod arranged on the second female die jacks up the spherical shell forging with the half-cambered