CN1730189A - High precision spinning forming method for thin wall closing head with radius-thickness ratio less than three per mille - Google Patents

High precision spinning forming method for thin wall closing head with radius-thickness ratio less than three per mille Download PDF

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Publication number
CN1730189A
CN1730189A CN 200510010321 CN200510010321A CN1730189A CN 1730189 A CN1730189 A CN 1730189A CN 200510010321 CN200510010321 CN 200510010321 CN 200510010321 A CN200510010321 A CN 200510010321A CN 1730189 A CN1730189 A CN 1730189A
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spinning
core
slab
radius
passage
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CN 200510010321
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CN100486728C (en
Inventor
单德彬
张艳秋
徐文臣
康达昌
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Harbin Institute of Technology
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Harbin Institute of Technology
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Abstract

The invention relates to a thin-walled closure head high accuracy spinning forming method. The invention is to resolve the problem of big size closure head, thin wall thickness, high accuracy size and high difficulty of forming. Spinning machine is started to make rolling wheel do axial and circumferential movement along track loaded into program in head while spinning, meanwhile main axle of spinning machine drives core and bar plate to spin. When rolling wheel rolls to the distance of 20mm from edge it quits. The invention has the advantages of simple process and high accurate product.

Description

Radius-thickness ratio is less than 3 ‰ thin-walled vessel head high accuracy spin forming method
Technical field
The present invention relates to a kind of spinning forming process of end socket.
Background technology
End socket is the crucial pressure-containing parts of all kinds of pressure vessels and tank, wherein radius-thickness ratio is mainly used on the liner and large scale pressure vessel of spacecraft upward pressure container and tank less than 3 ‰ thin-walled vessel head, and its forming technology has significant effects to the pressure vessel manufacturing technology.Traditional pressure vessel head adopts process for stamping production more, and process for stamping is produced end socket needs large-tonnage, the hydraulic press of big table top and complete large mold, is not suitable for the production characteristics of space flight pressure vessel head single-piece, small lot and many kinds.So, since the sixties, adopted spin-on process to produce various end sockets abroad more.Because the relative product for civilian use of spaceborne end socket size is bigger, and for weight reduction all is designed to small wall thickness, while dimension precision requirement height, so the difficulty that is shaped is big, particularly radius-thickness ratio are bigger less than 3 ‰ thin-walled vessel head mould pressing difficulty.This just needs low cost of development, high-quality, high-precision mould pressing technology, for relevant pressure vessel manufacturing provides product, and then improves the whole manufacture level of China's pressure vessel and tank.Also can significantly improve the design of pressure vessel tank and the range of choice of expansion matrix mother metal.
Summary of the invention
The objective of the invention is that spaceborne end socket size is big in order to solve, wall thickness is thin, dimension precision requirement is high, the shaping difficulty is big, particularly radius-thickness ratio is less than 3 ‰ the bigger problem of thin-walled vessel head mould pressing difficulty, provide a kind of radius-thickness ratio less than 3 ‰ thin-walled vessel head high accuracy spin forming method, the present invention only needs an equipment, disposable installation slab just can be finished mould pressing, has forming accuracy height, die cost characteristics low, with short production cycle.The present invention realizes by following steps: one, the selection of core: medium carbon steel that core material selection intensity and hardness are very high or tool steel, one end of core is the plane, the other end of core is the profile dark dish-shaped face consistent with the end socket interior shape, the center of plane one end has a tapered blind hole, this tapered blind hole cooperates with the spinning machine main shaft, be evenly distributed to few two tapped blind holes and one around its tapered blind hole and hide blind hole, tapped blind hole is used for fixing with the spinning machine main shaft, hide blind hole and be used to hide bolt on the main shaft, the position is consistent with the bolt on the main shaft; Dark dish-shaped face top is a spherical crown surface, the top of its spherical crown surface is processed with the plane of a diameter less than 30mm, to make things convenient for the fixing of slab, is evenly distributed to few two blind pin-and-holes around this planar central, alignment pin is installed in the inside of blind pin-and-hole, is used for the radial location of slab; Two, the selection of gland: gland is a weldment, the steel alloy that material selection intensity and hardness are very high, one end of gland is a concave spherical surface, the geomery of concave spherical surface is consistent with head contour, have around the center of concave spherical surface with core on the corresponding blind hole of alignment pin, be used to hide the alignment pin on the core; The center of the gland other end has a blind hole, and blind hole is used for cooperating with spinning tail top; Three, carry out the shaping of spherical crown part: be placed on two alignment pins installing the core end after two locating holes are driven at the slab center, start the spinning machine tailstock, tail top and core are clamped slab, coat lubricant to reduce friction at slab near a side of spinning roller, do axially and radial motion along the track of input program in advance when starting spinning machine and make the spinning roller rotation, spinning machine main shaft drive core and slab carry out rotation simultaneously, when spinning roller is screwed into the intersection point of spherical crown part and corner, instruction according to program is withdrawed from automatically, since then, the shear spinning of spherical crown part finishes; Four, carry out the shaping of flange part: at first the spinning machine tailstock is return, gland is enclosed within on the tail top, start the spinning machine tailstock once more, gland and core are clamped slab, and coat lubricant at the outer surface of slab; Starting spinning machine makes axially and radial motion spinning roller along the track of input program in advance in rotation, spinning machine main shaft drive core and slab carry out rotation simultaneously, the rising of this moment revolved a little identical with on last stage end point, make it to withdraw from automatically when spinning roller is screwed into apart from edge 20mm, this moment, the flange part first passage spinning finished; Carry out heat treated to eliminate work hardening with the external lot or luck by which people are brought together orchid of gas welding torch then, treat to coat lubricant after its cooling, then carry out the spinning of second passage, operating process is identical with first passage, it is spinning roller track difference, each passage operating process later on is all identical with second passage, just spinning roller track difference; Five, after forming process is finished, return the spinning machine tailstock, the workpiece that slab is made takes off from core, adopts craft or machining process that workpiece outer rim flange is cut away, and whole seal head forming process finishes.The invention has the beneficial effects as follows: only need an equipment, disposable installation blank just can be finished mould pressing, thereby forming accuracy is very high.The present invention can be shaped radius-thickness ratio less than 3 ‰, wall thickness is smaller or equal to the high accuracy thin-walled large scale end socket of 1mm.According to the characteristics of rotary pressed head, adopt two kinds of different spinning apparatus and parameter during shaping, can prevent the wrinkling of outer rim and cracking effectively.But the end socket of multiple material of the present invention's mould pressing and different-thickness, and die cost is low, produces the preparatory period weak point.
Description of drawings
Fig. 1 is the structural representation of core 1, Fig. 2 is the structural representation of gland 7, and Fig. 3 is a step 3 spherical crown part spinning schematic diagram, and Fig. 4 is a step 4 flange part spinning schematic diagram, Fig. 5 is the passage corner model schematic diagram of spinning process, and Fig. 6 is the general track schematic diagram that revolves of flange part.
The specific embodiment
The specific embodiment one: (referring to Fig. 1~Fig. 6) present embodiment realizes by following steps: one, the selection of core 1: medium carbon steel or tool steel that the material selection intensity of core 1 and hardness are very high, one end of core 1 is plane 8, the other end of core 1 is the profile dark dish-shaped face 9 consistent with the end socket interior shape, the center of plane 8 one ends has a tapered blind hole 10, this tapered blind hole 10 cooperates with the spinning machine main shaft, be evenly distributed to few two tapped blind holes 11 and one around its tapered blind hole 10 and hide blind hole 12, tapped blind hole 11 is used for fixing with the spinning machine main shaft, hide blind hole 12 and be used to hide bolt on the main shaft, the position is consistent with the bolt on the main shaft; Dark dish-shaped face 9 tops are spherical crown surface, the top of its spherical crown surface is processed with the plane 14 of a diameter less than 30mm, to make things convenient for the fixing of slab, is evenly distributed to few two blind pin-and-holes 13 around these 14 centers, plane, alignment pin is installed in the inside of blind pin-and-hole 13, is used for the radial location of slab; Two, the selection of gland 7: gland 7 is a weldment, the steel alloy that material selection intensity and hardness are very high, one end of gland 7 is a concave spherical surface 15, the geomery of concave spherical surface 15 is consistent with head contour, have around the center of concave spherical surface 15 with core 1 on the corresponding blind hole 16 of alignment pin, be used to hide the alignment pin on the core; The center of gland 7 other ends has a blind hole 17, and blind hole 17 is used for cooperating with spinning tail top 4; Three, carry out the shaping of spherical crown part: be placed on two alignment pins 5 installing core 1 end after two locating holes are driven at slab 2 centers, start the spinning machine tailstock, tail top 4 and core 1 are clamped slab 2, coat lubricant to reduce friction at slab 2 near a side of spinning roller 6, do axially and radial motion along the track of input program in advance when starting spinning machine and make spinning roller 6 rotations, spinning machine main shaft drive core 1 and slab 2 carry out rotation simultaneously, when spinning roller 6 is screwed into the intersection point of spherical crown part and corner, can withdraw from automatically according to the instruction of program, since then, the shear spinning of spherical crown part finishes; Four, carry out the shaping of flange part: at first the spinning machine tailstock is return, gland 7 is enclosed within on the tail top 4, start the spinning machine tailstock once more, gland 7 and core 1 are clamped slab 2, and coat lubricant at the outer surface of slab 2; Starting spinning machine makes axially and radial motion spinning roller 6 along the track of input program in advance in rotation, spinning machine main shaft drive core 1 and slab 2 carry out rotation simultaneously, the rising of this moment revolved a little identical with on last stage end point, make it to withdraw from automatically when spinning roller 6 is screwed into apart from edge 20mm, this moment, the flange part first passage spinning finished; Carry out heat treated to eliminate work hardening with the external lot or luck by which people are brought together orchid of gas welding torch then, treat to coat lubricant after its cooling, then carry out the spinning of second passage, operating process is identical with first passage, it is spinning roller track difference, each passage operating process later on is all identical with second passage, just spinning roller track difference; Five, after forming process is finished, return the spinning machine tailstock, the workpiece that slab 2 is made takes off from core 1, adopts craft or machining process that workpiece outer rim flange is cut away, and whole seal head forming process finishes.
The specific embodiment two: the material of present embodiment slab 2 is an aluminium alloy.Other method is with concrete
Embodiment one is identical.
The specific embodiment three: the radius of the end socket spherical crown part of present embodiment spinning is that the knuckle radius of SR298mm, flange part is that R87.35mm, end socket diameter are that the high wall thickness for 112mm, end socket of 372.5mm, end socket is 1mm, and dimensional accuracy is ± 0.1mm..Other method is identical with the specific embodiment one.
The specific embodiment four: in present embodiment step 3 and the step 4, the relative feed speed of spinning roller 6 is got 0.1mm/r when spherical crown part spinning, get 0.06~0.1mm/r during flange part spinning, rises to revolve and partly gets big value, gets the small value during near the outer.Other method is identical with the specific embodiment one.
The specific embodiment five: in present embodiment step 3 and the step 4, the track of spherical crown part is consistent with head contour, and the track of flange part is concave arc-straight line.Other method is identical with the specific embodiment one.
The specific embodiment six: in present embodiment step 3 and the step 4, the passage spacing between each passage is 2~3mm, and the passage corner is 1~2 degree, and the passage of front is got big value, and the passage of back gets the small value.Other method is identical with the specific embodiment one.
The specific embodiment seven: in the present embodiment step 4, heating-up temperature is 200~300 ℃.Other method is identical with the specific embodiment one.
Distinguishing feature of the present invention is:
Adopt a simple step have mould spinning method be shaped radius-thickness ratio less than 3 ‰, wall thickness is smaller or equal to 1mm's High accuracy thin-walled large-sized aluminium alloy end socket, required cost is low. Difference according to the part deformation mode adopts Corresponding technological parameter and frock can be controlled the mould pressing quality effectively. Core was adopted with cooperating of main shaft Cooperate with high-precision taper hole, be conducive to guarantee after core 1 is installed circle jumping degree and with the concentricity of main shaft. Core 1 contacts with enlarge active surface with slab 2 employing faces and is conducive to clamping work pieces, and adopts two location Sell 5 pairs of slabs 2 and carry out radial constraint, thereby guarantee that slab 2 is subjected to good constraint in spinning process And make plastic deformation smooth. Adopt the outer rim crimp and increase the measure of slab diameter and improve outer rim Rigidity of flange, and then the generation of control unstability and wrinkling are put the range of choice of technological parameter Wide. Propose first in spinning process, to adopt the relative feed speed that changes to prevent that the spinning later stage is wrinkling existing The generation of elephant; The spinning roller track adopts concave arc-straight path, and the distortion of marginal portion has steadily been reduced The trend of wrinkle; The selection at the first passage inclination angle will be decided according to selected slab thickness and theoretical attenuate amount; Really Decided the range of choice of thin-walled vessel head spinning passage spacing; The selection of each passage corner of rotary pressed head has been proposed Principle. The present invention only needs an equipment, but just mould pressing of disposable installation blank, thus wall has been exempted from more Change the inaccurate and problem on deformation in part location that blank causes, guaranteed the dimensional accuracy of part. Of the present invention Advance is: at first adopt the spherical crown part of a cover rotary pressure process parameter and device head formed by spinning, then Adopt other cover rotary pressure process parameter and a frock spinning flange part. Like this, just can guarantee the spherical crown part Each technological parameter and frock are conducive to shear spinning during spinning, and the resilience of blank is reduced, and are conducive to blank Paste mould, also can prevent the wrinkling of outer rim flange; Each technological parameter and frock are conducive to during flange part spinning Conventional spinning, make the smooth mould pressing of blank and do not produce wrinkling or the cracking. The big chi of suitable thin-walled has been proposed The technological parameter of very little aluminium alloy rotary pressed head and the principle of selection.

Claims (7)

1, a kind of radius-thickness ratio is less than 3 ‰ thin-walled vessel head high accuracy spin forming method, it is characterized in that it realizes by following steps: one, the selection of core: medium carbon steel that core material selection intensity and hardness are very high or tool steel, one end of core is the plane, the other end of core is the profile dark dish-shaped face consistent with the end socket interior shape, the center of plane one end has a tapered blind hole, this tapered blind hole cooperates with the spinning machine main shaft, be evenly distributed to few two tapped blind holes and one around its tapered blind hole and hide blind hole, tapped blind hole is used for fixing with the spinning machine main shaft, hide blind hole and be used to hide bolt on the main shaft, the position is consistent with the bolt on the main shaft; Dark dish-shaped face top is a spherical crown surface, the top that is fixed on spherical crown surface of slab is processed with the plane of a diameter less than 30mm for convenience, be evenly distributed to few two blind pin-and-holes around this planar central, alignment pin is installed in the inside of blind pin-and-hole, is used for the radial location of slab; Two, the selection of gland: gland is a weldment, the steel alloy that material selection intensity and hardness are very high, one end of gland is a concave spherical surface, the geomery of concave spherical surface is consistent with head contour, have around the center of concave spherical surface with core on the corresponding blind hole of alignment pin, be used to hide the alignment pin on the core; The center of the gland other end has a blind hole, and this blind hole is used for cooperating with spinning tail top; Three, carry out the shaping of spherical crown part: be placed on two alignment pins installing the core end after two locating holes are driven at the slab center, start the spinning machine tailstock, tail top and core are clamped slab, coat lubricant to reduce friction at slab near a side of spinning roller, do axially and radial motion along the track of input program in advance when starting spinning machine and make the spinning roller rotation, spinning machine main shaft drive core and slab carry out rotation simultaneously, when spinning roller is screwed into the intersection point of spherical crown part and corner, instruction according to program is withdrawed from automatically, since then, the shear spinning of spherical crown part finishes; Four, carry out the shaping of flange part: at first the spinning machine tailstock is return, gland is enclosed within on the tail top, start the spinning machine tailstock once more, gland and core are clamped slab, and coat lubricant at the outer surface of slab; Starting spinning machine makes axially and radial motion spinning roller along the track of input program in advance in rotation, spinning machine main shaft drive core and slab carry out rotation simultaneously, the rising of this moment revolved a little identical with on last stage end point, make it to withdraw from automatically when spinning roller is screwed into apart from edge 20mm, this moment, the flange part first passage spinning finished; Carry out heat treated to eliminate work hardening with the external lot or luck by which people are brought together orchid of gas welding torch then, treat to coat lubricant after its cooling, then carry out the spinning of second passage, operating process is identical with first passage, it is spinning roller track difference, each passage operating process later on is all identical with second passage, just spinning roller track difference; Five, after forming process is finished, return the spinning machine tailstock, the workpiece that slab is made takes off from core, adopts craft or machining process that workpiece outer rim flange is cut away, and whole seal head forming process finishes.
2, radius-thickness ratio according to claim 1 is less than 3 ‰ thin-walled vessel head high accuracy spin forming method, and the material that it is characterized in that slab is an aluminium alloy.
3, radius-thickness ratio according to claim 1 is less than 3 ‰ thin-walled vessel head high accuracy spin forming method, the radius that it is characterized in that the end socket spherical crown part of spinning is that the knuckle radius of SR298mm, flange part is that R87.35mm, end socket diameter are that the high wall thickness for 112mm, end socket of 372.5mm, end socket is 1mm, and dimensional accuracy is ± 0.1mm..
4, radius-thickness ratio according to claim 1 is less than 3 ‰ thin-walled vessel head high accuracy spin forming method, it is characterized in that in step 3 and the step 4, the relative feed speed of spinning roller is got 0.1mm/r when spherical crown part spinning, get 0.06~0.1mm/r during flange part spinning, rise to revolve and partly get big value, get the small value during near the outer.
5, radius-thickness ratio according to claim 1 is characterized in that in step 3 and the step 4 less than 3 ‰ thin-walled vessel head high accuracy spin forming method, and the track of spherical crown part be consistent with head contour, and flange track partly is concave arc-straight line.
6, radius-thickness ratio according to claim 1 is less than 3 ‰ thin-walled vessel head high accuracy spin forming method, it is characterized in that in step 3 and the step 4 that the passage spacing between each passage is 2~3mm, the passage corner is 1~2 degree, the passage of front is got big value, and the passage of back gets the small value.
7, radius-thickness ratio according to claim 1 is characterized in that in the step 4 that less than 3 ‰ thin-walled vessel head high accuracy spin forming method heating-up temperature is 200~300 ℃.
CNB2005100103210A 2005-09-12 2005-09-12 High precision spinning forming method for thin wall closing head with radius-thickness ratio less than three per mille Expired - Fee Related CN100486728C (en)

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CN101824527A (en) * 2010-05-25 2010-09-08 江苏双勤民生冶化设备制造有限公司 Reformer tube seal head heat treatment technology
CN102019530A (en) * 2009-09-17 2011-04-20 上海三达汽车配件有限公司 Method for positioning flange by spinning
CN102407268A (en) * 2010-09-25 2012-04-11 浙江中科金属制品有限公司 Crumple preventing process for preparing a special pressure vessel shell cover
CN102632140A (en) * 2012-05-14 2012-08-15 宜兴市联丰化工机械有限公司 Large-caliber head spinning die
CN103108709A (en) * 2010-10-01 2013-05-15 剑桥企业有限公司 Spin forming process and apparatus for manufacturing articles by spin forming
CN103831353A (en) * 2012-11-27 2014-06-04 芜湖众发旋压技术有限公司 Wide-flange tube workpiece spin forming mold set
CN104347883A (en) * 2013-08-07 2015-02-11 上海电气集团股份有限公司 Sodium-sulfur-battery anode container and processing method thereof
CN104439925A (en) * 2014-10-28 2015-03-25 宜兴市联丰化工机械有限公司 Ultrahigh-pressure large end socket contour machining method
CN105107917A (en) * 2015-08-04 2015-12-02 航天材料及工艺研究所 Storage tank hemispherical shell forming method for improving mechanical performance
CN106457339A (en) * 2014-07-02 2017-02-22 川崎重工业株式会社 Spin forming device
CN106623611A (en) * 2016-12-08 2017-05-10 重庆理工大学 Combined forming method of deep double-cone and spherical-head type thin-wall part
CN106903204A (en) * 2017-01-22 2017-06-30 湖北三江航天江北机械工程有限公司 Multi-angle conical shell rotary press modelling method
CN107309318A (en) * 2017-07-04 2017-11-03 上海交通大学 Plate radial direction differential temperature spinning apparatus and process
CN107913931A (en) * 2016-10-10 2018-04-17 首都航天机械公司 The bloom stable control method of large thin-wall part mould pressing
CN108097775A (en) * 2017-12-08 2018-06-01 四川航天长征装备制造有限公司 Large thin-wall song busbar end socket class part by numerical control spin forming device
CN109213072A (en) * 2017-09-07 2019-01-15 中国航空制造技术研究院 A kind of spinning machine accuracy control method
CN109482700A (en) * 2018-11-19 2019-03-19 湖北三江航天红阳机电有限公司 A kind of titanium alloy hemisphere rotary press modelling method and forming frock
CN109514190A (en) * 2018-11-19 2019-03-26 湖北三江航天红阳机电有限公司 A kind of aluminium alloy lining rotary press modelling method and spinning tool
CN109622713A (en) * 2018-12-27 2019-04-16 华南理工大学 The compound bent bus bar component room temperature spin forming method of hardly possible deformation nickel base superalloy
CN109794562A (en) * 2019-01-28 2019-05-24 陕西科技大学 A kind of semielliptical rotary pressed head forming method
CN110814143A (en) * 2019-11-28 2020-02-21 沈阳航天新光集团有限公司 TC4 titanium alloy super-hemisphere spinning forming method
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CN102019530A (en) * 2009-09-17 2011-04-20 上海三达汽车配件有限公司 Method for positioning flange by spinning
CN102019530B (en) * 2009-09-17 2013-07-10 上海三达汽车配件有限公司 Method for positioning flange by spinning
CN101824527A (en) * 2010-05-25 2010-09-08 江苏双勤民生冶化设备制造有限公司 Reformer tube seal head heat treatment technology
CN102407268A (en) * 2010-09-25 2012-04-11 浙江中科金属制品有限公司 Crumple preventing process for preparing a special pressure vessel shell cover
CN103108709A (en) * 2010-10-01 2013-05-15 剑桥企业有限公司 Spin forming process and apparatus for manufacturing articles by spin forming
CN102632140A (en) * 2012-05-14 2012-08-15 宜兴市联丰化工机械有限公司 Large-caliber head spinning die
CN103831353A (en) * 2012-11-27 2014-06-04 芜湖众发旋压技术有限公司 Wide-flange tube workpiece spin forming mold set
CN104347883A (en) * 2013-08-07 2015-02-11 上海电气集团股份有限公司 Sodium-sulfur-battery anode container and processing method thereof
CN106457339A (en) * 2014-07-02 2017-02-22 川崎重工业株式会社 Spin forming device
CN106457339B (en) * 2014-07-02 2019-02-12 川崎重工业株式会社 Rotary press modelling device
CN104439925A (en) * 2014-10-28 2015-03-25 宜兴市联丰化工机械有限公司 Ultrahigh-pressure large end socket contour machining method
CN105107917A (en) * 2015-08-04 2015-12-02 航天材料及工艺研究所 Storage tank hemispherical shell forming method for improving mechanical performance
CN107913931A (en) * 2016-10-10 2018-04-17 首都航天机械公司 The bloom stable control method of large thin-wall part mould pressing
CN106623611B (en) * 2016-12-08 2018-11-06 重庆理工大学 A kind of combined shaping method of the depth bipyramid with top dome shape thin-wall part
CN106623611A (en) * 2016-12-08 2017-05-10 重庆理工大学 Combined forming method of deep double-cone and spherical-head type thin-wall part
CN106903204A (en) * 2017-01-22 2017-06-30 湖北三江航天江北机械工程有限公司 Multi-angle conical shell rotary press modelling method
CN110891707A (en) * 2017-06-02 2020-03-17 Gkn航空服务有限公司 Friction forming
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CN109213072B (en) * 2017-09-07 2019-06-11 中国航空制造技术研究院 A kind of spinning machine accuracy control method
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CN109794562A (en) * 2019-01-28 2019-05-24 陕西科技大学 A kind of semielliptical rotary pressed head forming method
CN110814143A (en) * 2019-11-28 2020-02-21 沈阳航天新光集团有限公司 TC4 titanium alloy super-hemisphere spinning forming method
CN110814143B (en) * 2019-11-28 2021-07-20 沈阳航天新光集团有限公司 TC4 titanium alloy super-hemisphere spinning forming method
CN111299976A (en) * 2020-03-17 2020-06-19 三能器具(无锡)有限公司 Method for processing semifinished product of spinning rough blank of flower nozzle
CN112404228A (en) * 2020-11-26 2021-02-26 首都航天机械有限公司 Integral spinning forming process equipment for bottom of storage tank
CN113059325A (en) * 2021-03-31 2021-07-02 贵州航天天马机电科技有限公司 Precision forming method for large-size variable-curvature thin-wall storage tank diaphragm
CN113333557B (en) * 2021-06-09 2022-06-28 上海交通大学 Flow spinning die for thin-wall cylinder section with crossed ribs and forming method thereof

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