CN102974987A - Large-diameter thin-wall T250 steel pressure vessel vacuum electronic beam welding manufacturing method - Google Patents

Large-diameter thin-wall T250 steel pressure vessel vacuum electronic beam welding manufacturing method Download PDF

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CN102974987A
CN102974987A CN2012105199347A CN201210519934A CN102974987A CN 102974987 A CN102974987 A CN 102974987A CN 2012105199347 A CN2012105199347 A CN 2012105199347A CN 201210519934 A CN201210519934 A CN 201210519934A CN 102974987 A CN102974987 A CN 102974987A
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cylindrical shell
welding
blank
beam welding
electronic beam
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袁晓强
刘涛
王生斌
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201 Institutte Of No6 Research Institute Casic
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Abstract

The invention provides a large-diameter thin-wall T250 steel pressure vessel vacuum electronic beam welding manufacturing method, which comprises steps of blanking in an expanding manner according to the size of a spun blank of a cylinder, rolling into the cylinder and machining into the spun blank by using a vacuum electronic beam welding technology, wherein the main process flow comprises the following steps of: rechecking a plate; expanding; scribing; shearing the plate to blank; planing the edge; rolling; grinding; cleaning; performing spot welding; performing vacuum electronic beam welding; performing X-ray flaw detection; performing thermal treatment; sizing; performing X-ray flaw detection; and cropping the top. According to the method, bend forming of a high strength steel plate can be finished; and the method has the advantages of low cost, short machining period, capability of greatly improving the geometric accuracy of the cylinder and high longitudinal weld seam strength.

Description

Large diameter thin wall T250 steel pressure vessel vacuum electron beam welding manufacture method
Technical field
The invention belongs to the pressure vessel manufacturing technology.
Background technology
Maraging steel (Maraging Steel) is a kind of High-alloy Ultra-high Strength Steel of being succeeded in developing in nineteen sixty by the INCO of International nickel Co. Ltd. Inco. Ltd. research-and-development activity center.Different with the high strength steel that carbon formation intermetallic compound precipitation reaches sclerosis with tradition, Maraging steel has been broken with the conventional practice of carbon as main intensified element, and take the Ni iron pliable and tough as main alloy element forms-nickel martensitic matrix, from supersaturated solid solution (martensite), separate out alloy cpd by reinforced alloys elements such as Co, Mo, Ti when tempering or the timeliness and realize Strengthening and Toughening as Second Phase Particles, and carbon becomes the objectionable impurities element of obdurability.
The end of the seventies is to the beginning of the eighties, because global Co resource critical shortage, price sharply rises, and the exploitation cobalt-free maraging steel just causes people's attention to reduce cost.1980, American I NCO company develop has gone out to have the cobalt-free maraging steel VascoMax T-250 of actual application value, its performance and 18Ni9Co5Mo quite and not contain Co, thereby material cost is reduced greatly, and this has created good opportunity to develop for enlarging such material in the application of technical field.On this basis, INCO company develops T-200 in succession, two kinds of trade mark cobalt-free maraging steels of T-300.Similar to the 18Ni Maraging steel, it is titanium that its trade mark T represents main intensified element, and 200,250,300 represent respectively the varying strength rank.
Electron beam welding (Electron Beam Welding, EBW) be (can reach 105~107W/cm2) electron beams are realized welding to material and member as energy carrier special process method with the high-energy-density that focuses in the vacuum, it is fast to have speed of welding, the weldment thermal deformation is little, but welding material is many, welding seam deep width ratio height, good physical performance, purity high have been widely used in a plurality of fields.
At present, domestic with superhigh intensity T250 martensite ag(e)ing steel making major diameter
Figure BDA00002512038200011
And above pressure container cylinder adopts rotary press modelling more, and the required blank seamless steel pipe of spinning is by the method processing of poling and forging.
Be subject to domestic technology level restriction, diameter is
Figure BDA00002512038200012
The required spinning blank of pressure container cylinder can't realize that by poling processing can only adopt the method for forging, namely open die forging and looping mill rolling are forged at home.The spinning blank evenness of wall thickness of forging molding, circularity, linearity, surface roughness are very poor, must stay very large allowance, could be used for spinning through turning, boring endoporus, and its stock utilization is low, cost is high, the manufacturing cycle is long.
Spinning workblank sheet material volume weldering straight seam welding adopts the conventional soldering methods such as high frequency induction welding, argon arc welding or carbon-dioxide arc welding mostly, and material mostly is mild steel, low-carbon alloy structural steel.Conventional soldering method welding deformation is larger, and the cylindrical shell dimensional accuracy is relatively poor, and strength factor is low, can not satisfy the requirement of the high pressure resistant cylindrical shell spinning of thin-walled blank.
It is reported that introducing the T250 martensite steel has been applied to a plurality of fields such as Aero-Space, automobile boats and ships at home, but great majority all are used to structural member or other parts use.
East machinery plant uses this material to make φ 200mm left and right sides pressure container cylinder, does not set foot in φ 400mm/ φ 456mm pressure container cylinder spinning blank field.
φ 200mm left and right sides pressure container cylinder spinning blank adopts moulding materials in the tube rotary press modelling, adopt t4mm/t5mm sheet material to form in conjunction with the manufacturing of T250 Maraging steel spinning workblank sheet material volume weldering vertical masonry joint electron-bombardment welding technique manufacturing technology at φ 400mm/ φ 456mm pressure container cylinder spinning blank, both use material specification different, process route is inconsistent, and properties of product are had any different.
Summary of the invention
In order to overcome the deficiencies in the prior art, the invention provides a kind of large diameter thin wall T250 steel pressure vessel vacuum electron beam welding manufacture method, make the high pressure resistant cylindrical shell spinning of thin-walled blank with T250 Maraging steel spinning workblank sheet material volume weldering vertical masonry joint electron-bombardment welding technique technology, this technology is more widely used.
The technical solution adopted for the present invention to solve the technical problems may further comprise the steps:
A) steel plate is carried out chemical composition and mechanical energy reinspection; Carrying out spread material by cylindrical shell spinning blank diameter and length dimension calculates, cylindrical shell launches by trapezoidal method, reserving the 2mm welding contracted quantity rules at steel plate, use the plate shearing machine shearing blanking, butt joint edge is reserved the 20mm milling amount, mill two interfaces to line, precision is controlled in 0.7mm ~ 1mm scope, rolls and is rolled into cylindrical shell;
B) with polishing rust cleaning in the butt joint edge 20mm scope, clean buffed surface with aviation gasoline;
C) along from one end to the other side spot welding of abutment joint, butt-joint clearance control is not more than 0.3mm, misplaces height in 0.2mm, spot welding spacing 80mm~100mm, length 10mm~15mm;
D) will put the cylindrical shell degaussing of postwelding, residual magnetization is less than 1 * 10 -4T;
E) cylindrical shell is contained on the hold down gag, evenly compresses the abutment joint both sides;
F) with workpiece together with the frock vacuum chamber of packing into, make the movement locus deviation of abutment joint two ends and electron gun in 0.1mm;
G) carry out vacuum electron beam welding, make line and weld seam centering during welding, error is not more than 0.1mm; At first over against butt seam welding one time, welding condition is accelerating potential 60kV, electronic beam current 70 ~ 80mA, focus current 120 ~ 500mA, speed of welding 10 ~ 15mm/S; Then each mobile electron rifle 0.3mm~0.4mm to the abutment joint both sides respectively respectively welds one time again, and electronic beam current is than the little 2mA~3mA of first pass, and other technological parameter is constant; Modify welding over against weld seam at last;
H) to cylindrical shell flaw detection, the qualified cylindrical shell annealing in process of detecting a flaw; School circle after the cylindrical shell annealing, the circularity difference is take the tolerance of cylindrical shell spinning blank as standard; Again roll bending cylindrical shell longitudinal seam is carried out x-ray inspection behind the circle of cylindrical shell school; At last with the cylindrical shell clamping on lathe, turning cylindrical shell blank both ends of the surface are processed into cylindrical shell spinning blank.
The invention has the beneficial effects as follows:
1) conical shell " trapezoidal " law technology that launched the base technological innovation.This technology has changed the fan-shaped setting-out blank-making method of traditional conical shell, has improved the technology of spinning blank base, for cylindrical shell spinning and taper multistage cylindrical shell merging precision provide the foundation.
2) adopt veneer reeling machine can finish yield strength and arrive the moulding of 900MPa steel plate bending up to 880MPa.
3) T250 Maraging steel spinning workblank sheet material volume weldering vertical masonry joint electron-bombardment welding technique manufacturing technology is made cylindrical shell, and stock utilization can reach 67.8%, has reduced precious metal consumption; Cost, take φ 400mm/ φ 456mm T250 steel plate materials commonly used as example, every product is saved 150,000 yuan at least; Process-cycle reduces 1/3 at least than the conventional forging and pressing blank process-cycle.
4) the cylindrical shell geometric accuracy significantly improves, and longitudinal seam intensity reaches more than 95%.
Description of drawings
Fig. 1 is that trapezoidal method is launched schematic diagram;
Fig. 2 is the hold down gag schematic diagram, and wherein, Fig. 2 (a) is front view, and Fig. 2 (b) is side view;
Fig. 3 is certain pressure vessel schematic diagram;
Among the figure, 1-compressing member, 2-supporting seat, connector before the 3-core print, 4-, 5-cone cylinder leading portion, 6-cone cylinder back segment, 7-rear connectors.
The specific embodiment
The present invention is further described below in conjunction with drawings and Examples.
T250 Maraging steel spinning workblank sheet material volume weldering vertical masonry joint electron-bombardment welding technique manufacturing technology is to adopt national standard specification T250 Maraging steel ultrahigh-strength steel plates, press cylindrical shell spinning blank dimension unfolding and cutting, roll and be rolled into cylindrical shell, adopt the vacuum electron beam welding technology to be processed into the spinning blank, technical process is as follows:
Sheet material reinspection → expansion → line → shear blanking → plane limit → roll volume → polishing → cleaning → spot welding → electron-bombardment welding → x-ray inspection → heat treatment → school shape → x-ray inspection → crop.
A) reinspection and blanking: steel plate carries out chemical composition and mechanical energy is reviewed; Carrying out spread material by cylindrical shell spinning blank diameter and length dimension calculates, cylindrical shell launches (conical shell expansion by trapezoidal method, the fan-shaped laying off of traditional handicraft method, barrel diameter is large, cone angle hour, launch fan-shaped two arc radius and reach tens meters and larger, the process implementing error can not guarantee that at several millimeters the present technique implementation process requires), diameter is reserved the 2mm welding contracted quantity and is rule at steel plate, as shown in Figure 1.Use the plate shearing machine shearing blanking, butt joint edge is reserved the 20mm milling amount, mills two interfaces to line, and precision is controlled in 0.7mm ~ 1mm scope, rolls and is rolled into cylindrical shell.
Trapezoidal method is launched schematic diagram as shown in Figure 1, and among the figure, double dot dash line represents the actual displaypattern of conical shell, and trapezoidal two cornerwise tolerances are ± 1 in machining.
B) polishing cleaning: with emery cloth polishing rust cleaning, make two butt joint edge 20mm scopes expose metallic luster the cylindrical shell butt joint edge; Clean buffed surface with aviation gasoline, make the cylindrical shell joint without dirt.
C) spot welding location: from one end to the other side spot welding, butt-joint clearance control is not more than 0.3mm; The dislocation height should be controlled in the 0.2mm spot welding spacing 80mm~100mm, length 10mm~15mm.
D) degaussing: residual magnetization is less than 1 * 10 -4T.
E) assembling: the cylindrical shell that will put postwelding is contained in (the hold down gag structure is shown in Fig. 2 (a) and Fig. 2 (b)) on the hold down gag, evenly compresses the abutment joint both sides.
F) dress workpiece: together with the frock vacuum chamber of packing into, make the movement locus deviation of abutment joint two ends and electron gun in 0.1mm workpiece.
G) vacuum electron beam welding:
1) opposite joint: make line and weld seam centering, error is not more than 0.1mm;
2) welding: over against butt seam welding one time, the first pass welding condition sees Table 1.Then each mobile electron rifle 0.3mm~0.4mm to the abutment joint both sides respectively respectively welds one time again, and line is than the little 2mA~3mA of first pass, and other technological parameter is constant, then modifies welding over against weld seam.
Table 1 first pass welding condition
Accelerating potential (kV) Electronic beam current (mA) Focus current (mA) Speed of welding (mm/s)
60 70~80 500~120 10~15
The qualified cylindrical shell annealing in process of detecting a flaw, its purpose one is dehydrogenation, the 2nd, material softening.School circle after the cylindrical shell annealing, the circularity difference is take the tolerance of cylindrical shell spinning blank as standard; Again roll bending cylindrical shell longitudinal seam is carried out x-ray inspection behind the circle of cylindrical shell school, weldquality meets the welding relevant criterion.On lathe, turning cylindrical shell blank both ends of the surface are processed into cylindrical shell spinning blank with the cylindrical shell clamping.
Certain pressure vessel requires as shown in Figure 3, and is as follows take certain pressure vessel as example technical application process.
1) pressure vessel the key technical indexes:
A) barrel diameter is
Figure BDA00002512038200051
B) length 3064mm;
C) semi-cone angle is 0.50 °;
D) wall thickness is 2.0mm ± 0.10mm;
E) material T250 steel.
2) form and position tolerance the key technical indexes:
A) circularity≤1.5mm;
B) linearity≤2mm.
The mechanical performance that 3) will reach after the heat treatment:
A) matrix: R m〉=1760MPa, A 〉=5%;
B) strength of welded joint: R m〉=1584MPa, bend angles alpha 〉=35 °, flawless.
Cylindrical shell is comprised of cone cylinder leading portion and two parts of cone cylinder back segment.Because the restriction of material specification is adopted 2 t4mm * 1000mm * 2000mm steel plates respectively front and back section cylindrical shell to be carried out technology and is implemented.
Press the physical dimension of conical shell, carry out first the design of spinning blank, and carry out the technological design of spread material according to the physical dimension of spinning blank, with the cone cylinder launch into sector of spinning blank, using " trapezoidal " method to be designed to trapezoidal, trapezoidal physical dimension is controlled in the 0.7mm scope again.Trapezoidal pattern is drawn reviewing on the qualified steel plate through performance and chemical composition, used plate shearing machine for blanking, trapezoidal periphery all leaves the allowance of 20mm during blanking.After the blanking blank is placed on and presses and scrapes on the metal-planing machine, the trapezoidal plate blank of planing operation, dimensional tolerance is controlled in 0.7~1mm scope.
Trapezoidal flat board is placed on to roll on the special-purpose four axle veneer reeling machines and is rolled into cylindrical shell.Roll when volume first with two pairs of cylindrical shells by limit pre-bending, then adjust the up-down rollers suitable angle that tilts, can tapered cylindrical shell after making cylindrical shell roll volume.
After cylindrical shell rolled roll forming, apart from termination 20mm scope inner barrel, surfaces externally and internally polished metallic luster with gauze to two butt joint edges.Burnishing part cleans up with aviation gasoline.With the spot welding of cylindrical shell opposite side, spot welding is apart from 100mm~120mm, and pinpoint welding procedure highly is controlled in the 0.6mm cylindrical shell butt joint edge gap and dislocation.The cylindrical shell of some postwelding is contained in and carries out vacuum electron beam welding on the hold down gag.Welding parameter is: accelerating potential 60kV, electronic beam current 70mA~80mA, focus current 500mA~120mA, speed of welding 10mm/s~15mm/s.Postwelding outward appearance and x-ray inspection check, weldquality reaches the requirement of QJ972-86 " vacuum electron beam welding condition " I level weld seam.
Cylindrical shell corrects shape through after the solution treatment, and school shape makes cylinder roundness reach 2mm, linearity 1.5mm with shape-calibration machine or artificial school shape.School shape rear cylinder body at the cylindrical shell small end weldering end, is made the spinning blank that satisfies the spinning process requirement through Vehicle Processing two planar end surface.
Front and back section cone wound packages is used vacuum electron beam welding on hold down gag, the tapered cylindrical shell of assembly welding, and the girth joint x-ray inspection, quality reaches the requirement of QJ172-86 " vacuum electron beam welding technical conditions " I level weld seam.
Front and back connector after conical shell and the machining is contained on the hold down gag, carries out vacuum electron beam welding, and weld seam carries out x-ray inspection, and quality reaches the requirement of QJ172-86 " vacuum electron beam welding technical conditions " I level.
The assembly welding rear cylinder body is through 480 ℃ of Ageing Treatment, during timeliness with corrector to the cylinder body shaping, heat treatment rear cylinder body circularity≤1.5mm, linearity≤2mm.During the cylindrical shell timeliness, ribbon matrix and with stove mechanical performance test samples.Sample after testing, matrix R m〉=1760MPa, A 〉=5%, welded specimen R Am〉=1584MPa, bend angles alpha 〉=35 °, combination is processed to form cylindrical shell through machinery for flawless, cylindrical shell.
T250 Maraging steel spinning workblank sheet material volume weldering vertical masonry joint electron-bombardment welding technique manufacturing technology adopts new material T250 Maraging steel, use the vacuum electron beam welding technology, in conjunction with forging molding technical advantage characteristics, created a kind of brand-new major diameter T250 Maraging steel pressure container cylinder manufacturing technology.
Not only intensity is high for major diameter T250 Maraging steel pressure container cylinder, good toughness, need not preheating and after heat, does not also worry producing weld crack, and the sclerosis of heat affected area is little, and the aging temp of postwelding is low, and the change in size of goods is little.
The product that adopts this new technology manufacturing technology to obtain, weld seam and mother metal equal strength, stock utilization is high, and dimensional accuracy is better than rough forging spinning precision, is to make diameter to be
Figure BDA00002512038200061
The effective way of pressure container cylinder spinning blank can remedy the deficiency that rough forging is made cylindrical shell, widens spinning blank raw material supply channel, shortens the pressure vessel manufacturing cycle.
Take pressure container cylinder as example: cylindrical shell is Tapered Cup, 5 ° of diameters of tapering
Figure BDA00002512038200062
Length 3064mm, wall thickness 1.9mm adopts T250 Maraging steel spinning workblank sheet material volume weldering vertical masonry joint electron-bombardment welding technique manufacturing technology and forges two kinds of processes, and this new technology manufacturing technology advantage is as follows:
A) the precision increase rate is large
Take thickness 4mm sheet material as example, the precision of cylindrical shell spinning blank is as shown in table 2.
Table 2 forging method spinning blank and roll bending straight weld spinning semifinished product precision are relatively
Figure BDA00002512038200063
Figure BDA00002512038200071
As can be seen from Table 2, T250 Maraging steel spinning workblank sheet material volume weldering vertical masonry joint electron-bombardment welding technique manufacturing technology precision is respectively that open die forging and looping mill rolling are forged initial 9.2 times and 8.6 times of making semifinished product precision.
B) resource consumption and cost are remarkable
Forging and T250 Maraging steel spinning workblank sheet material volume weldering vertical masonry joint electron-bombardment welding technique manufacturing technology consumed resource and cost contrast see Table 3.
Table 3 forges and T250 Maraging steel spinning workblank sheet material volume weldering vertical masonry joint electron-bombardment welding technique manufacturing technology consumes and cost compare
Figure BDA00002512038200072
T250 Maraging steel per ton 300,000.As can be seen from Table 3, the needed material cost of T250 Maraging steel spinning workblank sheet material volume weldering vertical masonry joint electron-bombardment welding technique manufacturing technology is respectively 1/9 and 1/8 of open die forging and looping mill rolling forging material cost.This is because T250 Maraging steel spinning workblank sheet material volume weldering vertical masonry joint electron-bombardment welding technique manufacturing technology has been saved a lot of processing links and workload at the product manufacturing initial stage, thereby has reduced production cost.
C) process-cycle shortens
Cylindrical shell spinning blank adopts the technical process of forging molding and the moulding of roll bending vertical masonry joint electron beam welding:
1) method for forging and molding (take looping mill rolling as example)
Blank forging → annealing → blank looping mill rolling → annealing → blank turning.
2) T250 Maraging steel spinning workblank sheet material volume weldering vertical masonry joint electron-bombardment welding technique manufacturing technology
Blanking → roll roll forming → welding → annealing → shaping → blank turning (crop).
The contrast in man-hour of these two kinds of process manufacturing technologies sees Table 4.
Table 4 forges and T250 Maraging steel spinning workblank sheet material volume weldering vertical masonry joint electron-bombardment welding technique manufacturing technology compares man-hour
Figure BDA00002512038200081
As can be seen from Table 4, T250 Maraging steel spinning workblank sheet material volume weldering vertical masonry joint electron-bombardment welding technique manufacturing technology shortens 25 man-hours than open die forging manufacturing spinning blank.

Claims (1)

1. a large diameter thin wall T250 steel pressure vessel vacuum electron beam welding manufacture method is characterized in that comprising the steps:
A) steel plate is carried out chemical composition and mechanical energy reinspection; Carrying out spread material by cylindrical shell spinning blank diameter and length dimension calculates, cylindrical shell launches by trapezoidal method, reserving the 2mm welding contracted quantity rules at steel plate, use the plate shearing machine shearing blanking, butt joint edge is reserved the 20mm milling amount, mill two interfaces to line, precision is controlled in 0.7mm ~ 1mm scope, rolls and is rolled into cylindrical shell;
B) with polishing rust cleaning in the butt joint edge 20mm scope, clean buffed surface with aviation gasoline;
C) along from one end to the other side spot welding of abutment joint, butt-joint clearance control is not more than 0.3mm, misplaces height in 0.2mm, spot welding spacing 80mm~100mm, length 10mm~15mm;
D) will put the cylindrical shell degaussing of postwelding, residual magnetization is less than 1 * 10-4T;
E) cylindrical shell is contained on the hold down gag, evenly compresses the abutment joint both sides;
F) with workpiece together with the frock vacuum chamber of packing into, make the movement locus deviation of abutment joint two ends and electron gun in 0.1mm;
G) carry out vacuum electron beam welding, make line and weld seam centering during welding, error is not more than 0.1mm; At first over against butt seam welding one time, welding condition is accelerating potential 60kV, electronic beam current 70 ~ 80mA, focus current 120 ~ 500mA, speed of welding 10 ~ 15mm/S; Then each mobile electron rifle 0.3mm~0.4mm to the abutment joint both sides respectively respectively welds one time again, and electronic beam current is than the little 2mA~3mA of first pass, and other technological parameter is constant; Modify welding over against weld seam at last;
H) to cylindrical shell flaw detection, the qualified cylindrical shell annealing in process of detecting a flaw; School circle after the cylindrical shell annealing, the circularity difference is take the tolerance of cylindrical shell spinning blank as standard; Again roll bending cylindrical shell longitudinal seam is carried out x-ray inspection behind the circle of cylindrical shell school; At last with the cylindrical shell clamping on lathe, turning cylindrical shell blank both ends of the surface are processed into cylindrical shell spinning blank.
CN2012105199347A 2012-12-03 2012-12-03 Large-diameter thin-wall T250 steel pressure vessel vacuum electronic beam welding manufacturing method Pending CN102974987A (en)

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CN103737253A (en) * 2013-12-04 2014-04-23 江苏民生特种设备集团有限公司 Method for machining steel welding gas cylinder body
CN103737253B (en) * 2013-12-04 2016-08-17 江苏民生特种设备集团有限公司 The processing method of Welded steel cylinder cylinder
CN104907684A (en) * 2015-06-04 2015-09-16 中国船舶重工集团公司第七二五研究所 Electron beam welding method for tubes and closure plate in shell-and-tube heat exchanger
CN106695102A (en) * 2015-11-17 2017-05-24 鞍钢股份有限公司 Vacuum electronic welding method for highly-magnetic steel extremely-thick composite board
CN106695102B (en) * 2015-11-17 2018-12-04 鞍钢股份有限公司 A kind of vacuum electronic welding method of the special thick composite plate of high magnetic steel
CN106853549A (en) * 2015-12-08 2017-06-16 上海新力动力设备研究所 A kind of electro-beam welding method of thin-walled xenogenesis Maraging steel
CN107470864A (en) * 2017-08-03 2017-12-15 浙江汇金机械制造有限公司 A kind of steel cylinder flow forming and molding process
CN107470864B (en) * 2017-08-03 2019-05-14 浙江汇金机械制造有限公司 A kind of steel cylinder flow forming and molding process
CN114046287A (en) * 2021-11-17 2022-02-15 中国兵器工业集团江山重工研究院有限公司 Hydraulic integrated oil cylinder barrel and machining method thereof
CN114046287B (en) * 2021-11-17 2023-05-23 中国兵器工业集团江山重工研究院有限公司 Hydraulic integrated cylinder barrel and processing method thereof
CN115740964A (en) * 2022-10-10 2023-03-07 中国兵器科学研究院宁波分院 Manufacturing method of large-size thin-wall curved bus 5A06 aluminum alloy shell
CN115740964B (en) * 2022-10-10 2023-09-15 中国兵器科学研究院宁波分院 Manufacturing method of large-size thin-wall curved bus 5A06 aluminum alloy shell

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Application publication date: 20130320