CN113059325A - Precision forming method for large-size variable-curvature thin-wall storage tank diaphragm - Google Patents
Precision forming method for large-size variable-curvature thin-wall storage tank diaphragm Download PDFInfo
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Abstract
The invention discloses a method for precisely forming a large-size variable-curvature thin-wall storage tank diaphragm, which comprises the following steps of: a circular plate-shaped blank is spun into a hemispherical shell with a flange on the end face, a plane reference of the end face is machined after heat treatment, an outer spherical surface reference is machined according to the plane reference, an inner spherical surface, a flange outer spherical surface and a maximum outer circular surface are machined according to the outer spherical surface reference, and the outer spherical surface and the flange inner spherical surface are machined according to the plane reference. Compared with the traditional punch forming, the invention adopts spin forming to greatly save raw materials, can carry out forming processing by using thinner blanks, successfully solves the problems of thickness control and clamping of large-size variable-curvature thin-wall parts by means of designing and manufacturing special tool fixtures, adopting a vacuum chuck for adsorption and the like, and effectively prevents the deformation problem during processing of the thin-wall parts by precisely matching spherical tools with the inner and outer spherical surfaces of the parts.
Description
Technical Field
The invention relates to the field of machine manufacturing, in particular to a processing technology for precisely forming a large-size variable-curvature thin-wall storage tank membrane.
Background
In 2018, the launching activity in the field of global space transport is very active, more than 100 times of launching records are carried out for the first time, and 114 launching tasks are executed in total. At the satellite demand end, fourteen are the Chinese satellite launching outbreak period, and medium and large liquid rockets are the best choice.
The attitude and orbit control propulsion system plays an important role in various spacecrafts, namely, the stability of the orbit and the attitude of the spacecraft is maintained. The tank is one of the most important parts in the power system, and the manufacturing and processing quality of the tank directly influences the service performance of the whole propulsion system. With the rapid development of the aerospace technology, the on-orbit working time of spacecrafts such as satellites and the like is required to be prolonged, so that the liquid fuel in the spacecrafts is greatly increased. The prior art mainly adopts a bag type storage box, but the compatibility of a rubber bag and a propellant cannot ensure the long-term storage of the propellant. As a novel storage tank, the metal diaphragm storage tank has good corrosion resistance and can be stored for a long time, and the rigid diaphragm is tightly attached to the liquid level under the extrusion action of gas, so that the shaking of the propellant is eliminated.
The advanced storage box technology at abroad can make the attitude and orbit control power system meet the requirement of 15 years long-term storage by one-time filling, and greatly improve the reliability of the on-orbit flight of the spacecraft. However, the development requirement of the attitude and orbit control power system cannot be met due to the restriction of the design and manufacturing technology bottleneck of the metal diaphragm storage box, particularly the diaphragm in China, and the technology needs to be broken through urgently.
In order to meet the urgent need of weight reduction of aerospace products, the tank material is gradually changed from the traditional stainless steel material to an aluminum alloy and titanium alloy (including industrial pure titanium) material, while the titanium alloy (including industrial pure titanium) is more and more concerned due to higher specific strength and good high temperature resistance, and the titanium alloy (including industrial pure titanium) is most suitable for the tank with internal pressure as the main design working condition. The quality of the formed and manufactured storage tank diaphragm is directly related to the success of the overturning test of the diaphragm, and further related to the success of the manufacturing of the storage tank, the storage tank diaphragm belongs to a typical large-size variable-curvature thin-wall component, and the processing difficulty of the storage tank diaphragm is extremely high due to the fact that the thickness is thin and gradually changed, the precision requirement is high, the deformation is easy to occur in the processing process, the size precision is difficult to guarantee, and the temperature is required to be controlled in the spinning forming and machining processes. It is known from the search of relevant literature data at home and abroad that at present, most of storage tanks and diaphragm materials are made of aluminum alloy, and most of patent documents are mainly used for processing upper and lower shells of storage tanks, for example, patent application No. CN111203689A is used for manufacturing the upper and lower shells of storage tanks, the material is made of aluminum alloy, the wall thickness is 3.9mm, the material is uniform, and the material is formed by multiple punching and forming of thick plates of raw materials, so that not only is more raw materials consumed, the efficiency is extremely low, but also the processing hardening phenomenon is easily generated by multiple punching and stretching forming, and the material is easy to crack. For the forming of the large-size variable-curvature thin-wall storage tank diaphragm, the diaphragm is made of pure titanium, the thickness of the diaphragm is gradually changed from 1.8mm to about 1mm, the forming processing difficulty of the variable-curvature spherical workpiece with uneven thickness is far greater than the manufacturing difficulty of an upper shell and a lower shell which are even in thickness and relatively thick, vibration lines, deformation and clamping deformation are easily generated during the gradual thinning in the processing process, even cracking can be easily caused, meanwhile, the material is brittle and further cracked, and the forming, the measurement, the clamping and the like are difficult to realize by adopting the traditional method.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method solves the difficult problem of the forming processing technique of the large-size variable-curvature thin-wall storage tank diaphragm, breaks through the technical bottlenecks of integral precise forming, low cost and engineering application of the large-size complex variable-curvature thin-wall structural member, and overcomes the difficult points of forming, measuring and clamping which are difficult to realize by the common method.
The technical scheme of the invention is as follows:
a method for precisely forming a large-size variable-curvature thin-wall storage tank diaphragm comprises the following steps: a circular plate-shaped blank is spun into a hemispherical shell with a flange on the end face, a plane reference of the end face is machined after heat treatment, an outer spherical surface reference is machined according to the plane reference, an inner spherical surface, a flange outer spherical surface and a maximum outer circular surface are machined according to the outer spherical surface reference, and the outer spherical surface and an inner spherical surface of a flange R7 are machined according to the plane reference.
The method comprises the steps of cutting a circular platy blank by laser, and processing the surface of the blank by milling before spinning. According to the pre-calculated blank size, CO with the wavelength of 10.6 mu m is adopted2The laser is used for cutting, high-purity argon is used as auxiliary gas to finish the blanking of the spinning blank, the cut blank is milled to remove burrs, surface scratches, micro defects seen by naked eyes and the like, and the surface smoothness of the blank is ensured to meet the spinning requirement of industrial pure titanium.
And heating the blank during spinning, controlling the heating temperature to be below 200 ℃, mounting the blank on a spinning die to rotate, enabling the two spinning wheels to form an inclination angle of 45 degrees with the blank to be close to the front face for spinning, and sleeving a hemispherical semi-finished blank obtained by spinning on a flanging die for flanging and spinning to obtain a diaphragm semi-finished product. The purpose of the heating is to increase the elongation, but to prevent the billet from becoming brittle by hydrogen or oxygen uptake.
The heat treatment is to clamp the semi-finished product of the diaphragm between a heat treatment female die and a heat treatment male die, and a vacuum stress relief annealing process is adopted in a vacuum furnace, wherein the annealing temperature is 500-550 ℃, and the annealing time is 30-60 min. The heat treatment is mainly to eliminate stress, recover crystal grains, improve elongation and prevent larger deformation and crack during machining.
The plane reference processing is to use metal adhesive to bond the semi-finished diaphragm product with the tool, and the flanging part of the semi-finished diaphragm product is processed to be used as the plane reference. The outer spherical surface and the inner spherical surface of the flanging R7 are machined by taking the flanging part at the bottom of the diaphragm semi-finished product as a plane machining reference, the difficulty of plane reference machining is difficult to clamp and deform, the machining precision and roundness of the subsequent diaphragm semi-finished product are greatly influenced if the reference machining is inaccurate, the diaphragm semi-finished product and a tool are bonded by adopting a metal adhesive, the diaphragm semi-finished product and the tool are fixed without external force, the deformation caused by conventional clamping and fastening during machining of the diaphragm semi-finished product reference surface is reduced, and the precision of the diaphragm semi-finished product is ensured.
And processing the spherical outside surface by taking the flanging part of the semi-finished membrane as a plane reference, placing the plane reference surface of the semi-finished membrane on a platform, and pressing the flanging part to perform turning processing on the spherical outside surface.
And carrying out diagonal symmetrical uniform pressure along at least 6 points of the circumference of the flanging part to compact the semi-finished product of the diaphragm, carrying out rough turning on the outer spherical surface, loosening the flanging part for 26-48 hours after the rough turning is finished, and then compacting the flanging part to finish turning the outer spherical surface after the stress is fully released. And loosening the pressure plate once or several times during test, fully releasing the machining stress, and then, tightly pressing and machining.
The outer spherical surface is used as a positioning reference to process the inner spherical surface, the flanging outer spherical surface and the maximum outer circular surface, the outer spherical surface is tightly attached to an inner cavity of a female die tool, after leveling and fixing, a special thickness gauge is used for measuring the thickness of each annular band of a diaphragm semi-finished product with different thickness, according to measured data, under the premise that the machining allowance of about 0.5mm is reserved for fine machining, rough turning is adopted for processing, the thickness is measured once every rough turning is carried out, and the machining allowance of about 0.5 is reserved for fine machining. And after rough turning is finished, finish turning is carried out, and the thickness is required to be measured once after finish turning is finished, so that the thickness of each ring belt with different thickness meets the requirement of drawing dimensional accuracy until the dimensional accuracy meets the requirement of the drawing.
The inner spherical surface of the diaphragm semi-finished product with the processed inner spherical surface is tightly attached to the outer cavity of the male die tool, the outer spherical surface and the inner spherical surface of the flanging R7 are processed by taking the flanging part as a plane reference, and the inner spherical surface and the flanging outer spherical surface are respectively taken as thickness references.
And fixing the outer spherical surface or the inner spherical surface of the semi-finished diaphragm in a spherical female die tool or a spherical male die tool in a vacuum adsorption mode. In order to prevent the diaphragm from being processed and scrapped after the diaphragm is loosened on the tool due to poor fit between the diaphragm and the tool due to vacuum decompression in the processing process, a pressure maintaining test needs to be carried out for 72 hours before processing.
The invention has the beneficial effects that:
(1) compared with the traditional punch forming, the invention adopts the spinning forming, so that the raw materials can be greatly saved, the forming processing can be carried out by using a thinner blank, the forming efficiency is high, the semi-finished product of the diaphragm can be obtained by spinning for 1-2 passes, and the cracking caused by work hardening is not easy to generate because the number of spinning passes is small; the spinning blank with the thickness more than 5 times is generally needed in the stamping process, the efficiency is extremely low after the multiple stamping and forming processes are carried out, and the multiple stamping and stretching processes are easy to produce the work hardening phenomenon and are easy to crack.
(2) The invention successfully solves the difficult problems of thickness control and clamping of large-size variable-curvature thin-wall parts by adopting special thickness gauges, special tool fixtures for design and manufacture, vacuum chuck for adsorption and the like, and effectively prevents the deformation problem during the processing of the thin-wall parts by precisely matching the spherical tool with the inner and outer spherical surfaces of the parts.
(3) The invention breaks through the technical bottlenecks of integral precision forming, low cost and engineering application of large-scale complex thin-wall structural members by researching the key process of forming and processing the large-scale variable-curvature thin-wall member storage tank diaphragm, solves the difficult problem of forming and processing technology, masters the key technology of manufacturing the storage tank diaphragm and ensures the successful product development. The roundness of the storage tank membrane can reach 0.1mm, the spherical profile can reach 0.2mm, the tensile strength sigma b is not lower than 310MPa, and the elongation is not less than 30%.
Drawings
FIG. 1 is a schematic diagram of a reservoir diaphragm configuration.
FIG. 2 is a schematic view of semi-spherical spinning of a blank.
Fig. 3 is a schematic view of blank flanging spinning.
FIG. 4 is a schematic view of the heat treatment of the semi-finished film.
FIG. 5 is a schematic plan view of a diaphragm blank.
Fig. 6 is a schematic reference surface processing diagram of the diaphragm semi-finished product outer spherical surface.
FIG. 7 is a schematic diagram of rough finishing of the inner spherical surface of the diaphragm semi-finished product.
FIG. 8 is a schematic diagram of rough finishing of the outer spherical surface of the diaphragm semi-finished product.
1-storage box diaphragm 2-spinning headstock 3-mandrel 4-screw 5-spinning die 6-1-right-handed wheel 6-2-left-handed wheel 7-1-right-handed wheel base 7-2-left-handed wheel base 8-blank 9-tail top 10-spinning machine tailstock 11-semi-finished blank 12-flanging die 13-heat treatment female die 14-heat treatment male die 15-diaphragm semi-finished product 16-hanging ring 17-hanging rod 18-reinforcing rib 19-reinforcing rib 20-screw 21-datum plane to be processed 22-metal adhesive 23-tooling 24-lathe platform 25-bolt 26-pressing plate 27-female die tooling 28-vacuum suction cup 29-sealing adhesive tape 30-male die 25-pressing plate 27 Tool equipment
Detailed Description
Examples
The maximum diameter of the large-size variable-curvature thin-wall storage tank diaphragm is
The roundness is 0.1mm, the wall thickness is gradually changed from 1.8mm to about 1mm, the requirement on the size precision of the storage tank diaphragm is high, the forming processing difficulty is extremely high, particularly, the used material is pure titanium, the strength is low, the deformation is easy to occur in the forming processing, the titanium absorbs hydrogen from 250 ℃ and absorbs oxygen from 400 ℃, so that the industrial pure titanium is easy to be polluted by impurities to become brittle in the processing and forming, the storage tank diaphragm has a complex structure, particularly the curvature of a flanging part is large, the hot forming is needed in the forming processing, and the forming processing difficulty is further improved; the application aims to adopt a special thickness gauge to measure the thickness and design and manufacture a special tool clamp to carry out spinning forming, the roundness reaches 0.1mm, the spherical profile can reach 0.2mm, and the tensile strength sigma isbNot less than 310MPa and elongation not less than 30%.
1. Laser cutting: cutting by adopting a CO2 laser with the wavelength of 10.6 mu m according to the pre-calculated blank size, and finishing the blanking of the spinning blank by adopting high-purity argon as auxiliary gas;
2. milling: milling the cut blank to remove burrs, surface scratches, micro defects seen by naked eyes and the like, and ensuring the surface smoothness of the blank so as to meet the spinning requirement of industrial pure titanium;
3. spinning and forming: cutting spinning in a powerful spinning mode is adopted, the shape of a blank is changed, the thickness of the blank is also obviously changed, front hemispherical spinning forming is firstly carried out by using a spinning die, then back flanging spinning forming is carried out by using a flanging die, referring to attached drawings 2 and 3, during spinning, a spinning die 5 is firstly installed on a spinning mandrel 3 through a screw 4, the spinning mandrel 3 is installed on a spinning headstock 2, a blank 8 is propped against the spinning die 5 by using a tail top 9, the tail top 9 is installed on a tail seat 10 of a spinning machine, the blank 8 rotates under the driving action of the spinning headstock 2, the rotating speed is 20rpm, when the blank 8 rotates, flame is adopted to heat the blank 8, an infrared thermometer is used for measuring the temperature of the blank 8 while heating, when the blank is heated to a certain temperature, the heating temperature is controlled to be below 200 ℃, then a left spinning wheel 6-2 installed on a left spinning wheel base 7-2 and a left spinning wheel 6-2 installed on a right spinning wheel base are installed on The right spinning wheels 6-1 and the blank 8 form an inclination angle of 45 degrees and are close to the blank 8, the front spinning is carried out at the rotating speed of 100rpm, the required blank shape is obtained through spinning, the semi-finished blank 11 is obtained, the front spinning is finished, the tail top 9 is loosened, the flanging die 12 is sleeved on the semi-finished blank 11, then the left and right spinning wheels 6-1 and 6-2 are changed into a small-diameter spinning wheel, and the semi-finished blank 11 is subjected to flanging spinning from the back side, so that the diaphragm semi-finished product 15 is obtained.
4. And (3) heat treatment: referring to fig. 4, the semi-finished diaphragm 15 is clamped between the heat treatment female die 13 and the heat treatment male die 14, and the heat treatment female die 13 and the heat treatment male die 14 are connected by screws 20 so as to clamp the semi-finished diaphragm 15. In order to enhance the rigidity of the heat-treatment punch 14, a rib 18 and a rib 19 are provided. In order to facilitate the hoisting of the heat treatment die, a hanger rod 17 and a hanging ring 16 are arranged between the upper parts of the heat treatment female die 13 and the heat treatment male die 14. In order to eliminate the stress of the semi-finished membrane product 15 and facilitate subsequent mechanical finish machining, a vacuum stress relief annealing process is adopted in a vacuum furnace, the annealing temperature is 500-550 ℃, and the annealing time is 30-60 min.
5. And (3) plane reference processing: the outer spherical surface is machined by taking the flanging part at the bottom of the diaphragm semi-finished product as a plane machining reference, the difficulty of machining the plane reference is difficult to clamp and deform, the machining precision and roundness of a subsequent diaphragm semi-finished product are greatly affected if the reference machining is inaccurate, see the attached drawing 5, the outer spherical surface of the diaphragm semi-finished product 15 is fixed on a tool 23 by adopting a metal adhesive 22, the diaphragm semi-finished product and the tool are not fixed by using external force, the deformation generated by conventional clamping and fastening during machining the diaphragm semi-finished product reference surface is reduced, the precision of the diaphragm semi-finished product is ensured, and after the clamping is firm, the two end surfaces of the reference surface 21 to be machined of the diaphragm semi-finished product 15 are subjected to mechanical finish turning, and the two end levels are.
6. Processing an outer spherical surface reference surface: the outer spherical surface is used as a reference for processing the inner spherical surface, the difficulty of processing the reference surface of the outer spherical surface is how to control the deformation of the round bottom part of a semi-finished membrane in the processing, the measure is to use a pressure plate on a lathe platform to compress along at least 6 points of the circumference, to compress by diagonally symmetrical uniform pressure, to perform rough turning processing first and then to perform finish turning processing, to release the pressure plate for one or more trial turns, to fully release the processing stress and then to perform the pressing and processing: referring to the attached figure 6, a plane reference surface processed by a diaphragm semi-finished product 15 is placed on a lathe platform 24, the pressing plate 26 is used for pressing the flanging parts at two ends of the diaphragm semi-finished product 15, the pressing plate 26 is connected with the lathe platform 24 through a bolt 25, the diaphragm semi-finished product 15 is pressed on the lathe platform 24 by adopting the pressing plate 26 to carry out diagonal symmetrical uniform pressure along at least 6 points of the circumference, the outer spherical surface is firstly roughly lathed, the cutting depth generally exceeds 0.1, the pressing plate is loosened for 26 to 48 hours after rough lathing is finished, after stress is fully released, the diaphragm semi-finished product 15 is pressed by the pressing plate 26 for finish lathing, the cutting depth generally does not exceed 0.1, one thickness measurement is carried out by using a special thickness gauge every rough lathing or finish lathing until the outer spherical surface reference surface of the diaphragm semi-finished product 15 meets the requirement of the inner cavity,
7. rough and fine turning of the inner spherical surface, the flanging outer spherical surface and the maximum outer circular surface: the external spherical surface is used as a positioning reference, and the requirement on the size is met
The spherical surface, the flanging spherical surface and
the maximum excircle part is subjected to rough and finish turning, and the processing difficulty is that the wall thickness is gradually thinned in the turning process to generate vibration lines and deformation generated by clamping, and the processing quality is difficult to ensure by adopting a conventional processing method. According to the solution of the application, referring to fig. 7, the outer spherical surface of the diaphragm semi-finished product 15 is tightly attached to the inner cavity of the female die tooling 27, and the outer spherical surface of the diaphragm semi-finished product 15 is adsorbed by a vacuum chuck 28 through a small hole of the female die tooling 27, so that the outer spherical surface of the diaphragm semi-finished product 15 is completely attached to the inner cavity of the female die tooling 27; in order to prevent the film semi-finished product 15 from generating vacuum decompression during processing to cause poor bonding, sealing is carried out by using a sealing adhesive tape 29, and a pressure maintaining test for 72 hours is required before rough processing. Before rough turning, a special thickness gauge is used for measuring the thickness of each annular belt of the diaphragm semi-finished product 15 with different thickness, according to measured data, on the premise of ensuring that the machining allowance of about 0.5mm is reserved for finish machining, rough turning is adopted, according to the allowance, the cutting depth with more allowance is larger, the cutting depth with less allowance is smaller (the maximum cutting depth is generally larger than 0.1, and the specific condition is determined according to the allowance), the thickness is measured once every rough turning until the machining allowance of about 0.5 is reserved for finish machining. And after rough turning is finished, finish turning is carried out, the cutting depth of finish turning is generally not more than 0.1 each time, the thickness needs to be measured once after finish turning is finished, so that the thickness of each ring belt with different thicknesses meets the requirement of drawing dimensional accuracy, and the finish turning is carried out for about 5 times until the dimensional accuracy meets the requirement of the drawing.
8. Rough and finish machining of the outer spherical surface and the inner spherical surface of the turned-over edge R7: referring to fig. 8, the inner spherical surface of the diaphragm semi-finished product 15 with the processed inner spherical surface is tightly attached to the outer cavity of the male die tool 30, and the vacuum chuck 28 is used for adsorbing the inner spherical surface of the diaphragm semi-finished product 15 through the small hole of the male die tool 30, so as to ensure that the inner spherical surface of the diaphragm semi-finished product 15 is completely attached to the outer cavity of the male die tool 30. The processing method is similar to the step 7.
Claims (10)
1. A large-size variable-curvature thin-wall storage tank diaphragm precise forming method is characterized by comprising the following steps: a circular plate-shaped blank is spun into a hemispherical shell with a flange on the end face, a plane reference of the end face is machined after heat treatment, an outer spherical surface reference is machined according to the plane reference, an inner spherical surface, a flange outer spherical surface and a maximum outer circular surface are machined according to the outer spherical surface reference, and the outer spherical surface and the flange inner spherical surface are machined according to the plane reference.
2. The precision forming method of the large-size variable-curvature thin-wall storage tank membrane as claimed in claim 1, wherein the method comprises the following steps: the method comprises the steps of cutting a circular platy blank by laser, and processing the surface of the blank by milling before spinning.
3. The precision forming method of the large-size variable-curvature thin-wall storage tank membrane as claimed in claim 2, wherein: and heating the blank during spinning, controlling the heating temperature to be below 200 ℃, mounting the blank on a spinning die to rotate, enabling the two spinning wheels to form an inclination angle of 45 degrees with the blank to be close to the front face for spinning, and sleeving a hemispherical semi-finished blank obtained by spinning on a flanging die for flanging and spinning to obtain a diaphragm semi-finished product.
4. The precision forming method of the large-size variable-curvature thin-wall storage tank membrane as claimed in claim 3, wherein the method comprises the following steps: the heat treatment is to clamp the semi-finished product of the diaphragm between a heat treatment female die and a heat treatment male die, and a vacuum stress relief annealing process is adopted in a vacuum furnace, wherein the annealing temperature is 500-550 ℃, and the annealing time is 30-60 min.
5. The precision forming method of the large-size variable-curvature thin-wall storage tank membrane as claimed in claim 3, wherein the method comprises the following steps: the plane reference processing is to use metal adhesive to bond the semi-finished diaphragm product with the tool, and the flanging part of the semi-finished diaphragm product is processed to be used as the plane reference.
6. The precision forming method of the large-size variable-curvature thin-wall storage tank membrane as claimed in claim 5, wherein the method comprises the following steps: and processing the outer spherical surface and the flanged inner spherical surface by taking the flanged part at the bottom of the semi-finished diaphragm product as a plane reference, placing the plane reference surface of the semi-finished diaphragm product on a platform, and pressing the flanged part to perform turning processing on the outer spherical surface.
7. The method for precisely forming the large-size variable-curvature thin-wall storage tank membrane according to claim 6, wherein the method comprises the following steps: and carrying out diagonal symmetrical uniform pressure along at least 6 points of the circumference of the flanging part to compact the semi-finished product of the diaphragm, carrying out rough turning on the outer spherical surface, loosening the flanging part for 26-48 hours after the rough turning is finished, and then compacting the flanging part to finish turning the outer spherical surface after the stress is fully released.
8. The precision forming method of the large-size variable-curvature thin-wall storage tank membrane as claimed in claim 6 or 7, wherein: the outer spherical surface is used as a positioning reference to process the inner spherical surface, the flanging outer spherical surface and the maximum outer circular surface, the outer spherical surface is tightly attached to an inner cavity of a female die tool, after leveling and fixing, a special thickness gauge is used for measuring the thickness of each annular band of a diaphragm semi-finished product with different thickness, according to measured data, under the premise that the machining allowance of about 0.5mm is reserved for fine machining, rough turning is adopted for processing, the thickness is measured once every rough turning is carried out, and the machining allowance of about 0.5 is reserved for fine machining. And after rough turning is finished, finish turning is carried out, and the thickness is required to be measured once after finish turning is finished, so that the thickness of each ring belt with different thickness meets the requirement of drawing dimensional accuracy until the dimensional accuracy meets the requirement of the drawing.
9. The method for precisely forming the large-size variable-curvature thin-wall storage tank membrane according to claim 8, wherein the method comprises the following steps: and tightly attaching the inner spherical surface of the diaphragm semi-finished product with the processed inner spherical surface to the outer cavity of the male die tool, processing the outer spherical surface and the flanged inner spherical surface by taking the flanged part as a plane reference, and simultaneously taking the inner spherical surface as a thickness reference.
10. The method for precisely forming the large-size variable-curvature thin-wall storage tank membrane as claimed in claim 9, wherein the method comprises the following steps: and fixing the outer spherical surface or the inner spherical surface of the semi-finished membrane in a vacuum adsorption mode.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114178800A (en) * | 2021-12-31 | 2022-03-15 | 湖北三江航天红阳机电有限公司 | Titanium alloy thin-wall hemisphere processing method |
| CN115889826A (en) * | 2023-01-30 | 2023-04-04 | 蓝箭航天空间科技股份有限公司 | Method for machining outer shape of bottom circular ring of ellipsoidal box of rocket storage box |
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