CN109794561A - A kind of semielliptical rotary pressed head molding machine - Google Patents
A kind of semielliptical rotary pressed head molding machine Download PDFInfo
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- CN109794561A CN109794561A CN201910080613.3A CN201910080613A CN109794561A CN 109794561 A CN109794561 A CN 109794561A CN 201910080613 A CN201910080613 A CN 201910080613A CN 109794561 A CN109794561 A CN 109794561A
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Abstract
The invention discloses a kind of semielliptical rotary pressed head molding machines, including fixed pedestal, cooperation is equipped with moving beam on fixed pedestal, horizontal mobile mechanism and spindle rotation mechanism are respectively equipped on moving beam, moving beam can be moved in the horizontal direction with horizontal mobile mechanism, spindle rotation mechanism is equipped with the semielliptical end socket inner tube of a tyre that three sides are not waited, the hold-down mechanism that pressuring action is played to material base is equipped with above the not equal semielliptical end socket inner tube of a tyre in three sides, the side of hold-down mechanism is equipped with the spinning machine that spinning is carried out to material base.The present invention solves the problems, such as the not equal semiellipticals rotary pressed head difficult forming in current three side.
Description
Technical field
The invention belongs to the not equal semiellipticals end socket manufacturing technology fields in three sides in equipment manufacturing, are related to a kind of semielliptical envelope
Head rotary press modelling device.
Background technique
Special-shaped pressure vessel is chiefly used in vehicle-mounted removable container and the lower boiler of pressure etc..Cylindroid container is mainly
It is made of the not equal semiellipticals end socket in cylindroid cylinder and left and right two three sides, size is larger, and General Elliptic long axis is mostly 2000
~3000mm.
The difference of the not equal semiellipticals end socket in three sides and ellipse head is:
First is that, since special-shaped container pressure resistance performance is poor, being suitable for the lower occasion of pressure, Gu Qibi in intensity requirement
It is thick relatively thin；
Second is that when three sides are not waited with semiellipticals end socket, it is different from ellipse head, spinning section at present in molding
And it is elliptical, in each oval cross section of spinning, with the variation of spinning point position on the spinning section ellipse, spinning
The distance between point and elliptical center are variations, and this point brings very big difficulty to spinning, and semielliptical end socket is normal at present
With the Multi-step forming method of forming form, it is necessary to design and produce relatively large multiple stamping dies, Mold Making amount is big, not only consumptive material but also
Time-consuming, simultaneously because its structure is complicated, stress, deformation are more uneven when punching press, it is easier to generate defect, it is difficult to guarantee quality.
Third is that be circle with the section of its central axis on ellipse head in shape, and the not equal semiellipticals envelope in three sides
On the head and section of its central axis is also all oval；
Therefore, the not equal semiellipticals end socket in three sides is more difficult compared to traditional ellipse head molding, needs to design one kind
Dedicated for the rotary press modelling device of semielliptical end socket.
Summary of the invention
The object of the present invention is to provide a kind of semielliptical rotary pressed head molding machines, solve the not equal semiellipticals in current three side
The problem of rotary pressed head difficult forming.
The technical scheme adopted by the invention is that a kind of semielliptical rotary pressed head molding machine, including fixed pedestal, it is fixed
Cooperation is equipped with moving beam on pedestal, is respectively equipped with horizontal mobile mechanism and spindle rotation mechanism on moving beam, and moving beam can be with
Horizontal mobile mechanism moves in the horizontal direction, and spindle rotation mechanism is equipped with the semielliptical end socket inner tube of a tyre that three sides are not waited, and three sides are not
Deng the semielliptical end socket inner tube of a tyre above be equipped with and play the hold-down mechanism of pressuring action to material base, the side of hold-down mechanism is equipped with to material base
Carry out the spinning machine of spinning.
The features of the present invention also characterized in that
Sliding slot is equipped at fixed pedestal center, the bottom of moving beam is equipped with sliding block, and sliding block and sliding slot cooperate.
Horizontal mobile mechanism includes lead screw, and lead screw level is set in sliding block, and the both ends of lead screw pass through fixed base respectively
Seat supports, one end of lead screw are connected with servo motor B, and servo motor B is rack-mount.
Spindle rotation mechanism includes main shaft, and main shaft is vertically arranged in the middle part of moving beam, and the lower end of main shaft is equipped with servo electricity
Machine A, the upper end of main shaft are equipped with the semielliptical end socket inner tube of a tyre that three sides are not waited, and servo motor A is mounted on fixed pedestal by mainshaft cap
On.
Hold-down mechanism includes hydraulic cylinder A, and the piston rod A telescopic end end of hydraulic cylinder A connects pressure head, pressure by ball joint
Head compresses material base with the cooperation of the semielliptical end socket inner tube of a tyre, when spinning, material base be arranged pressure head and the semielliptical end socket inner tube of a tyre it
Between, the top of moving beam is equipped with braced frame, and the middle part of braced frame is arranged in hydraulic cylinder.
Spinning machine includes hydraulic cylinder B, and the piston rod B telescopic end end of hydraulic cylinder B is equipped with spinning roller, passes through spinning roller pair
Material base carries out spinning, and the side of fixed pedestal is connected with C-shaped support, and one end of C-shaped support is connected on fixed pedestal, hydraulic cylinder
The other end of C-shaped support is arranged in B.
Beneficial effects of the present invention are as follows:
1. the present invention using there is mould spinning, that is, uses semielliptical shape internal model, when spinning, material base is first had to be pressed on internal model
On；
2. special fixed pedestal, is arranged sliding slot on fixed pedestal, sliding block, sliding block and cunning are set in the bottom of moving beam
Slot cooperation, and level is coated with lead screw in sliding block, servo motor drives lead screw rotation to drive moving beam in the sliding slot of fixed pedestal
Middle movement；The top of fixed pedestal is also provided with the spinning machine that can only realize vertical movement；
3. being provided with main shaft and for main shaft axially position and fixed servo motor in frame-type moving beam middle and lower part
The mainshaft cap of A, servo motor is mounted on mainshaft cap and energy driving spindle rotation, is provided with semielliptical shape on the top of main shaft
The inner tube of a tyre；On moving beam top, it is provided with the hydraulic cylinder B that can only realize vertical movement, hydraulic cylinder B realizes spinning by piston rod B
The substrate hold-down function of roller.
4. the hydraulic cylinder B in spinning machine realizes the spinning precision of spinning roller by servo-hydraulic control.
Detailed description of the invention
Fig. 1 is a kind of main view of semielliptical rotary pressed head molding machine of the present invention；
Fig. 2 is a kind of side view of semielliptical rotary pressed head molding machine of the present invention；
Fig. 3 (a), (b) are established using in a kind of rotary press modelling method of semielliptical rotary pressed head molding machine of the present invention
The not equal ellipsoids shell side journey schematic diagram in three sides；
Fig. 4 is using oval cross section in a kind of rotary press modelling method of semielliptical rotary pressed head molding machine of the present invention
Hierarchical diagram.
In figure, 1. fixed pedestals, 2. moving beams, 3. lead screws, 4 main shafts, the 5. semielliptical end socket inner tubes of a tyre, 6. material bases, 7. pressure heads,
8. ball joint, 9. piston rod A, 10. hydraulic cylinder A, 11. mainshaft caps, 12. servo motor A, 13 spinning rollers, 14. piston rod B,
15. hydraulic cylinder B, 16. servo motor Bs, 17. brackets, 18. sliding slots, 19. sliding blocks, 20. braced frames, 21.C shape support.
Specific embodiment
The following describes the present invention in detail with reference to the accompanying drawings and specific embodiments.
A kind of semielliptical rotary pressed head molding machine of the present invention, structure is as shown in Figure 1, 2, including fixed pedestal 1, fixed base
Sliding slot 18 is equipped at 1 center of seat, cooperation is equipped with moving beam 2 on fixed pedestal 1, and the bottom of moving beam 2 is equipped with sliding block 19, sliding block 19
Cooperate with sliding slot 18, level is coated with lead screw 3 in sliding block 19, and moving beam 2 can be moved in the horizontal direction along lead screw 3, lead screw 3
Both ends pass through fixed pedestal 1 respectively and support, and one end of lead screw 3 is connected with servo motor B 16, and servo motor B 16 is mounted on bracket
On 17；
The middle part of moving beam 2 is equipped with main shaft 4 along the vertical direction, and main shaft 4 is arranged in a staggered manner on moving beam 2 with lead screw 3, main shaft
4 lower end is equipped with servo motor A12, and the upper end of main shaft 4 is equipped with three and (does not refer to not etc. when three in the not equal semielliptical end socket inner tube of a tyre 5
Be horizontal direction radius x, longitudinal direction y in the same plane of ellipsoid and spatial altitude direction radius z three not phase
Deng)；Servo motor A12 is mounted on fixed pedestal 1 by mainshaft cap 11.
The top of moving beam 2 is equipped with braced frame 20, and the middle part of braced frame 20 is arranged hydraulic downward equipped with piston rod
The piston rod A9 telescopic end end of cylinder A10, hydraulic cylinder A10 connect pressure head 7 by ball joint 8, in pressure head 7 and semielliptical end socket
The cooperation of tire 5 compresses material base 6, and when spinning, material base 6 is arranged between pressure head 7 and the semielliptical end socket inner tube of a tyre 5.
The side of fixed pedestal 1 is connected with C-shaped support 21, and one end of C-shaped support 21 is connected on fixed pedestal 1, C-shaped branch
The hydraulic cylinder B15 that piston rod is arranged downward, the piston rod B14 telescopic end end of hydraulic cylinder B15 are equipped on the downside of the other end of seat 21
Equipped with spinning roller 13, spinning is carried out to material base 6 by spinning roller 13.
A kind of course of work of semielliptical rotary pressed head molding machine of the present invention is, when work, servo motor B 16 drives silk
Thick stick 3 rotates, and the sliding block 19 on moving beam 2 is pushed to move in the sliding slot 18 of fixed pedestal 1, and main shaft 4 is driven to arrive operating position,
It is exactly the reference point location (vertex on the right side of the first layer cross section of reference point location transverse) of the first spin-on layers, material base 6 is right
In be put on the inner tube of a tyre 5, hydraulic cylinder A10 is by piston rod A9, and (piston rod A9 is connected band dynamic head 7 by ball joint 8 and pressure head 7
Connect) material base 6 is compressed, and keep material base 6 locally-shaped in the collective effect next top of pressure head 7 and the inner tube of a tyre 5, servo motor B 16 drives
Lead screw 3 drives moving beam 2 mobile, the movement of Lai Shixian main shaft 4, the inner tube of a tyre 5, material base 6, when making first layer spinning cross-sectional layers, first
The position of layer oval cross section datum mark is in the floor projection position of spinning roller 13, then controls liquid by servo hydraulic system again
Cylinder pressure B15, piston rod B14 drive spinning roller 13 to be moved vertically downwardly into setting position and compress material base 6；Then servo motor A12
Rotation drives main shaft 4, the inner tube of a tyre 5, material base 6 and pressure head 7 to rotate, and at this moment spinning roller 13 begins to form the spinning to material base 6；
In spinning process, 13 position of spinning roller is constant, and drives lead screw 3 that moving beam 2 is driven to move by servo motor B 16
Dynamic, Lai Shixian main shaft 4, the inner tube of a tyre 5, material base 6 realize main shaft 4 in the variation requirement of horizontal plane position with the movement of moving beam 2.
The first layer spinning of material base 6 rotates a circle, and after first layer spinning is completed, spinning stops, and servo motor B 16 drives
Lead screw 3 drives moving beam 2 mobile, the movement of Lai Shixian main shaft 4, the inner tube of a tyre 5, material base 6, when making second layer spinning cross-sectional layers, second
The reference point location of layer oval cross section is in the floor projection position of spinning roller 13, and then spinning roller 13 vertically moves down into spinning position
It sets, similarly realizes the spinning of the second spin-on layers of material base 6.And so on, realize the spinning of each spin-on layers of entire end socket, also
Realize the spinning of end socket.
Spinning terminates, and servo motor B 16 drives 3 rotation forces moving beam 2 of lead screw to move in the sliding slot 18 of fixed pedestal 1
It is dynamic, it drives main shaft 4 to leave spinning area, unloads the good end socket of spinning.
Whole process is controlled by CNC digital control system.Structure is simple, easy to operate, high-efficient, and apparatus structure is compact.
Using a kind of rotary press modelling method of semielliptical rotary pressed head molding machine of the present invention, specifically comprise the following steps:
Step 1, the not equal ellipsoids shell side journey in three sides is established, specifically:
x2/a2+y2/b2+z2/c2=1 (1)；
Wherein, a ≠ b ≠ c；A indicates ellipsoid shell in x-axis away from the distance of central point；B indicates ellipsoid shell in the y-axis direction
Distance away from central point, c indicate ellipsoid shell in the z-axis direction away from the distance of central point；
If a=1000, b=800, c=500, referring to Fig. 3 (a), Fig. 3 (b), the not equal ellipsoids shell side journey in three sides can be write as:
x2/10002+y2/8002+z2/5002=1, z ∈ [0,500] (2)；
Step 2, the equation of any single oval cross section is sought according to the not equal ellipsoids shell side journey in three sides of step 1 foundation, specifically
Process is as follows:
If single oval cross section is 1-1 ', if the z-axis size of section 1-1 ' is Z=c1, by Z=c1It substitutes into formula (2)
In ellipsoid formula, the elliptic equation of section 1-1 ' is obtained are as follows:
X2/[4(2500-c1 2)]+y2/[2.56(2500-c1 2)]=1 (3)；
X=ρ cos θ, y=ρ sin θ is enabled again, then formula (3) converts are as follows:
2.56ρ2cos2θ+4ρsin2θ=10.24 (2500-c1 2) (4)；
Wherein, any point on θ expression oval cross section 1-1 ' and the angle between oval x-axis positive coordinate, θ ∈ [0 °,
360 °], and θ is positive integer；ρ expression oval cross section 1-1 ' goes up any point to the distance of elliptical center；
ρ circular is as follows:
Assignment is carried out to θ respectively, θ is enabled to be respectively equal to 0,10 °, 20 ° ... 360 °, as long as each θ value is substituted into formula (4)
In to get each point on the corresponding oval cross section 1-1 ' of different θ out to elliptical center distance ρ；
When spinning, main shaft 4 drives material base 6 (material base 6 is Seal head blank) at the uniform velocity to rotate, if rotation speed is ω, then arbitrarily
The relational expression of material base 6 rotational angle θ and time t is in time t:
Θ=ω t (5)；
Then x=ρ cos θ, y=ρ sin θ converts are as follows: x=ρ cos (ω t), y=ρ sin (ω t),
Then formula (4) can be converted into following formula:
2.56ρ2cos2(ωt)+4ρsin2(ω t)=10.24 (2500-c1 2) (6)；
By establishing the relationship between ρ and t in formula (6), when main shaft 4 drives material base 6 at the uniform velocity to rotate any time t, rotation
13 projected position of pressure roller is to the positional distance ρ of 4 central point of main shaft, i.e., main when main shaft 4 drives material base 6 at the uniform velocity to rotate any time t
When axis 4 is moved left and right along 1 level of fixed pedestal, it is ensured that ρ meets the requirement of formula (6).
Step 3, using there is mould spinning process, the semiellipticals end socket inner tube of a tyre 5, the semielliptical end socket inner tube of a tyre are not waited in one three side of production
5 outer surface structures and size are consistent with the not equal Semi Ellipsoidal Shells interior wall construction in three sides and size；
Step 4, spinning prepares
According to the size dimension of semielliptical end socket, the horizontal position of main shaft 4 is first adjusted, then the semielliptical end socket inner tube of a tyre 5
It is mounted on main shaft 4, then being placed on the semielliptical end socket inner tube of a tyre 5 in 6 pairs of round material base, then material base 6 is pressed on pressure head 7
On the semielliptical end socket inner tube of a tyre 5；
Step 5, spinning sequence is determined
If there is N layers of oval cross section on semielliptical end socket, N is positive integer；
When rotary pressed head, start at the top of self-sealing head to divide plurality of layers oval cross section spinning from top to bottom, specific layering how much by
Technological design determines, at the top of head formed by spinning when first layer oval cross section, with the first layer oval cross section long axis rightmost side at the top of end socket
On the basis of vertex (positive direction of the x-axis and elliptical intersection point), spinning top second layer, third layer ..., n-th layer section it is oval
When, benchmark is similar；Referring to fig. 4, A, B, C point are respectively the datum mark of three layers of oval cross section of being connected in Fig. 4,1 in Fig. 4,2 ... N
Indicate the oval cross section number of plies；
The reference point location of i.e. any one layer oval cross section is this layer of oval cross section long axis rightmost side vertex position.
The base position of oval cross section is just arranged in the horizontal position of spinning roller 13, and spinning roller 13 is in entire spinning process
In, when moving to base position, the horizontal position of spinning roller 13 is no longer changed, and is in horizontal reference position always；
Main shaft 4 drive the semielliptical end socket inner tube of a tyre 5, material base 6, pressure head 7 movement respectively be rotation and along the x-axis direction front and back
It moves horizontally；
Step 6, start spinning
If the z-axis coordinate of N layers of oval cross section is ci, i=1,2 ... ..., N；c1< c2< ... < cN；
At the top of head formed by spinning when first layer oval cross section, servo motor B 16 drives lead screw 3 to rotate, and moving beam 2 drives master
Axis 4 is moved in the horizontal direction along lead screw 3, makes datum mark and the projection in the horizontal direction of spinning roller 13 of first layer oval cross section
Point position is overlapped, and then hydraulic cylinder B15 drives spinning roller 13 to be moved down into setting position, and lower mobile setting position is by first
The elliptical Z axis coordinate value c of layer cross section1It determines, after spinning roller falls in the reference point location of first layer oval cross section, is adjusted by step 5
The main shaft 4 of whole good position drives the semielliptical end socket inner tube of a tyre, material base 6, pressure head 7 to be rotated, and starts at the top of head formed by spinning the
One layer of oval cross section, in 4 rotary course of main shaft, horizontal shifting, main shaft 4 are moved horizontally apart from root main shaft 4 along the x-axis direction
It is determined according to the formula (6) in step 2, main shaft 4 rotates a circle, and first layer oval cross section completes spinning at the top of end socket, and main shaft 4 stops
Rotation；
When successively carrying out spinning to remaining N-1 layers of oval cross section, moving beam 2 drives main shaft 4 along lead screw 3 in level side
To movement, make datum mark and subpoint position of the spinning roller 13 on this layer of oval cross section of remaining N-1 layers of oval cross section respectively
(when carrying out spinning to second layer oval cross section, this layer of oval cross section refers to second layer oval cross section for coincidence；When to third layer
When oval cross section carries out spinning, this layer of oval cross section refers to third layer oval cross section, and so on, when to n-th layer elliptical cross section
When face carries out spinning, this layer of oval cross section refers to n-th layer oval cross section), hydraulic cylinder B15 is then passed sequentially through by spinning roller 13
C is moved down along the z-axis direction2、……cN, after spinning roller 13 successively falls in the reference point location of remaining N-1 layers of oval cross section respectively, press
According to the spinning process of first layer oval cross section, from the second layer to n-th layer oval cross section, successively to remaining N-1 layers of oval cross section into
Row spinning, after n-th layer oval cross section spinning is completed, semielliptical rotary pressed head is completed.
Claims (6)
1. a kind of semielliptical rotary pressed head molding machine, it is characterised in that: including fixed pedestal, on fixed pedestal, cooperation, which is equipped with, moves
Beam is moved, is respectively equipped with horizontal mobile mechanism and spindle rotation mechanism on moving beam, moving beam can be as horizontal mobile mechanism be in water
Square to movement, spindle rotation mechanism is equipped with the three sides not equal semielliptical end socket inner tube of a tyre, and three sides are not in equal semielliptical end socket
The hold-down mechanism that pressuring action is played to material base is equipped with above tire, the side of hold-down mechanism is equipped with the spinning machine that spinning is carried out to material base
Structure.
2. a kind of semielliptical rotary pressed head molding machine according to claim 1, it is characterised in that: in the fixed pedestal
Sliding slot is equipped at the heart, the bottom of moving beam is equipped with sliding block, and sliding block and sliding slot cooperate.
3. a kind of semielliptical rotary pressed head molding machine according to claim 2, it is characterised in that: described to move horizontally machine
Structure includes lead screw, and lead screw level is set in the sliding block, and the both ends of lead screw are supported by fixed pedestal respectively, and the one of lead screw
End is connected with servo motor B, and servo motor B is rack-mount.
4. a kind of semielliptical rotary pressed head molding machine according to claim 1, it is characterised in that: the main shaft whirler
Structure includes main shaft, and main shaft is vertically arranged in the middle part of moving beam, and the lower end of main shaft is equipped with servo motor A, and the upper end of main shaft is equipped with
The equal semielliptical end socket inner tube of a tyre, servo motor A are not mounted on fixed pedestal by mainshaft cap on three sides.
5. a kind of semielliptical rotary pressed head molding machine according to claim 4, it is characterised in that: the hold-down mechanism packet
Hydraulic cylinder A is included, the piston rod A telescopic end end of hydraulic cylinder A connects pressure head, pressure head and the semielliptical end socket inner tube of a tyre by ball joint
Cooperation compresses material base, and when spinning, material base is arranged between pressure head and the semielliptical end socket inner tube of a tyre, and the top of moving beam is equipped with
The middle part of braced frame is arranged in braced frame, hydraulic cylinder.
6. a kind of semielliptical rotary pressed head molding machine according to claim 1, it is characterised in that: the spinning machine packet
Hydraulic cylinder B is included, the piston rod B telescopic end end of hydraulic cylinder B is equipped with spinning roller, carries out spinning to material base by spinning roller, fixed
The side of pedestal is connected with C-shaped support, and one end of C-shaped support is connected on fixed pedestal, and C-shaped support is arranged in hydraulic cylinder B
The other end.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910080613.3A CN109794561A (en) | 2019-01-28 | 2019-01-28 | A kind of semielliptical rotary pressed head molding machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910080613.3A CN109794561A (en) | 2019-01-28 | 2019-01-28 | A kind of semielliptical rotary pressed head molding machine |
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| CN109794561A true CN109794561A (en) | 2019-05-24 |
Family
ID=66560496
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| CN201910080613.3A Pending CN109794561A (en) | 2019-01-28 | 2019-01-28 | A kind of semielliptical rotary pressed head molding machine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110773664A (en) * | 2019-09-29 | 2020-02-11 | 山东红荷专用汽车有限公司 | Forming equipment for sub-circular end socket |
| CN113996690A (en) * | 2021-11-09 | 2022-02-01 | 四川航天长征装备制造有限公司 | Manufacturing method of large thin-wall special-shaped curved surface component |
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| 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 |
| CN105562499A (en) * | 2014-10-17 | 2016-05-11 | 宜兴市联丰化工机械有限公司 | Ultrahigh-pressure large-scale end socket spinning machine |
| JP2017104895A (en) * | 2015-12-11 | 2017-06-15 | 有限会社箕輪ヘラ絞製作所 | Spatula restriction method and spatula restriction machine |
| CN107876615A (en) * | 2017-10-26 | 2018-04-06 | 叶泽龙 | A kind of thin-wall aluminum alloy end socket auxiliary mask mould pressing frock and its forming technology |
| CN108080480A (en) * | 2016-11-21 | 2018-05-29 | 浙江和良智能装备有限公司 | Cnc spinning machine |
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- 2019-01-28 CN CN201910080613.3A patent/CN109794561A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105562499A (en) * | 2014-10-17 | 2016-05-11 | 宜兴市联丰化工机械有限公司 | Ultrahigh-pressure large-scale end socket spinning machine |
| JP2017104895A (en) * | 2015-12-11 | 2017-06-15 | 有限会社箕輪ヘラ絞製作所 | Spatula restriction method and spatula restriction machine |
| CN108080480A (en) * | 2016-11-21 | 2018-05-29 | 浙江和良智能装备有限公司 | Cnc spinning machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110773664A (en) * | 2019-09-29 | 2020-02-11 | 山东红荷专用汽车有限公司 | Forming equipment for sub-circular end socket |
| CN113996690A (en) * | 2021-11-09 | 2022-02-01 | 四川航天长征装备制造有限公司 | Manufacturing method of large thin-wall special-shaped curved surface component |
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