CN106217921A - Electromotor composite material casing integral formation method with jet pipe - Google Patents
Electromotor composite material casing integral formation method with jet pipe Download PDFInfo
- Publication number
- CN106217921A CN106217921A CN201610586122.2A CN201610586122A CN106217921A CN 106217921 A CN106217921 A CN 106217921A CN 201610586122 A CN201610586122 A CN 201610586122A CN 106217921 A CN106217921 A CN 106217921A
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- Prior art keywords
- jet pipe
- electromotor
- composite material
- skirt
- quartz sand
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D99/00—Subject matter not provided for in other groups of this subclass
- B29D99/006—Producing casings, e.g. accumulator cases
Abstract
The invention discloses the electromotor composite material casing integral formation method of a kind of band jet pipe, by jet pipe pre-launch machine composite shell body by integral forming by the way of winding, eliminate the structure being connected again after electromotor composite material casing is separately formed with jet pipe in prior art with metal, but joint after jet pipe and electromotor composite material casing is integrated, after jet pipe assembling puts in place, jet area contraction section is the most Wrapping formed with electromotor composite material casing, original jet pipe metal shell is instead of with winding layer, eliminate joint after electromotor composite material casing, the parts such as jet pipe metal shell and connector, motor mass fraction can be effectively improved；And use technique end socket and fixed block, overcome the Nozzle throat restriction to core mandrel, can ensure well jet pipe axial gap and with the control of housing axiality；It addition, the integral formation method of the present invention is simple and convenient to operate, the cycle is short and cheap.
Description
Technical field
The invention belongs to rocket engine composite material casing field shaping technique, be specifically related to starting of a kind of band jet pipe
Machine composite material casing integral formation method.
Background technology
Develop the developing goal that high-quality is Solid Rocket Propulsion Technology than solid engines.The passive quality meeting of rocket engine
Reducing the carrying capacity of rocket, more toward Upper Stage, this impact is the biggest.
Fiber winding motor case can effectively reduce the passive weight of motor body, is the master of alternate-engine housing
Want developing direction, but the fiber winding motor case of routine rear head to be passed through is with the metal flange on jet pipe even
Connecing, passive weight is the biggest, reduces the mass ratio of solid propellant rocket, thus largely have impact on solid-rocket
The serviceability of electromotor, and manufacture assembling process is numerous and diverse, the cycle is longer.
Summary of the invention
Present invention aim to the deficiency for traditional diamond-making technique, it is provided that one can be effectively improved electromotor matter
Amount compares, can overcome again the Nozzle throat electromotor composite material casing integral formation method to the band jet pipe that core mandrel limits,
Ensure jet pipe each part axial gap and the control with electromotor composite material casing axiality.
For achieving the above object, the electromotor composite material casing integral formation method of the band jet pipe designed by the present invention is
Jet pipe and electromotor composite material casing quickness and high efficiency are combined into an overall process, described electromotor composite material casing bag
Including housing body part and be connected to the front connector of housing body unit sub-headend, described integral formation method comprises the steps:
1) difference molding jet pipe, front connector, front skirt, rear skirt, water solublity quartz sand core and mandrel, wherein: water solublity stone
The outer mold surface of sand core is consistent with profile in electromotor composite material casing；
2), after water solublity quartz sand core being sleeved on mandrel, wrap up around water solublity quartz sand core intermediate cylinder section
One layer of polytetrafluoroethylene film, at water solublity quartz sand core leading portion outer surface and outside water solublity quartz sand core back segment
Surface and extend to the conical surface of mandrel rear axle and all brush one layer of releasing agent；Then all paste on polytetrafluoroethylene film and remover
Upper EPDM rubber insulation；
3) front connector is installed to through step 2) process after the front end of water solublity quartz sand core leading portion；Pass through technique
Jet pipe is installed on mandrel rear axle by end socket, and the converging portion of jet pipe fits in rear end and the core of water solublity quartz sand core back segment
The conical surface of axle rear axle；
4), after installing front connector and jet pipe, front connector outer surface and jet area contraction section outer surface are pasted ethylene-propylene-diene monomer
Glue heat insulation layer, then uses hyperbola to be wound around the mode combined to front connector outer surface, water solublity stone longitudinally wound with hoop
The EPDM rubber insulation of sand core outer surface and jet area contraction section outer surface carries out integration winding, and solidifies；
5) through step 4) be wound around, solidify after, technique end socket is removed, before front skirt is installed to water solublity quartz sand core
On section winding layer, rear skirt is installed on water solublity quartz sand core back segment winding layer, and front skirt and rear skirt is wound solid
Change；
6), after front skirt and rear skirt wound and solidified complete, the demoulding obtains the electromotor composite material casing of band jet pipe.
Further, described step 1) in, water solublity quartz sand core is according to quartz sand, the weight ratio of polyethylene alcohol and water
Being 100: (3～5): the proportions quartz sand mixed glue of 8, solidification obtains water solublity quartz sand core；Water solublity quartz
Core mould is point some sections of sand molds, and every section of sand mold is the most separately formed, every section of sand mold preset annular groove time separately formed, wherein before and after
The sand mold outer mold surface at two ends is consistent with profile in electromotor composite material casing；When described every section of sand mold is separately formed, every section of sand
The outer mold surface of type leaves machine and adds surplus, and end face is smooth.
Further, described step 1) in, mandrel is divided into solid front axle, hollow middle shaft and solid rear axle, front axle, axis and
Rear axle independent machine added-time external diameter all leaves machine and adds and be respectively arranged with in surplus, and front axle, axis and rear axle and water solublity quartz sand
The keyway that key on core matches；And the conical surface of mandrel rear axle is consistent with the interior profile of jet area contraction section.
Further, described step 3) in, front connector is connected with front end fixed flange, and front end fixed flange is by front
End stationary jaw is fixed on the front axle of mandrel；Being cased with fixed block on mandrel rear axle, fixed block serves as a contrast at the diffuser of jet pipe；Work
Skill end socket is fixed on mandrel rear axle by rear end fixing device, and technique end socket and fixed block are all coaxially fixed with mandrel.
Further, described step 5) in, the rear end that front skirt installs claw with front skirt is connected, and the front end of claw installed by front skirt
Being fixedly installed on mandrel front axle by front end fixing device, the front end that rear skirt installs claw with rear skirt is connected, and card installed by rear skirt
The rear end of pawl is fixedly installed on mandrel rear axle by rear end fixing device.
Further, described step 5) in, hyperbola is fiber and increases longitudinally wound being wound around, with hoop, the material used
Strong epoxy resin；Described step 6) in, front skirt and rear skirt are wound around the material used and are fiber reinforced epoxy resin.
Further, described step 6) in, front skirt is installed claw, rear skirt installation claw and front end stationary jaw and removes,
From water solublity quartz sand core front end giant water solublity quartz sand core is rinsed dissolving core again, and in the past
End takes out mandrel, then removes the polytetrafluoroethylene film of parcel around water solublity quartz sand core intermediate cylinder section.
The present invention compared with prior art, has the advantage that the electromotor composite material casing one of band jet pipe of the present invention
Body formed method, eliminates the knot being connected again after electromotor composite material casing is separately formed with jet pipe in prior art with metal
Structure, but joint after jet pipe and electromotor composite material casing is integrated, after jet pipe assembling puts in place, jet area contraction section with
Electromotor composite material casing is the most Wrapping formed, instead of original jet pipe metal shell with winding layer, eliminates electromotor
After composite material casing, the parts such as joint, jet pipe metal shell and connector, can be effectively improved motor mass fraction；And use
Technique end socket and fixed block, overcome the Nozzle throat restriction to core mandrel, can ensure well the axial gap of jet pipe with
And with the control of housing axiality；It addition, the integral formation method of the present invention is simple and convenient to operate, the cycle is short and cheap,
It is particularly suited for the electromotor composite material casing that fiber is wound around.
Accompanying drawing explanation
Fig. 1 is the integrated structural representation of electromotor composite material casing of band jet pipe of the present invention；
Fig. 2 is the structural representation of jet pipe in Fig. 1；
Fig. 3 is winding tool structure schematic diagram in the present embodiment；
Fig. 4 is front skirt and rear skirt overskirt tool structure schematic diagram in the present embodiment；
Fig. 5 is the structural representation of mandrel in Fig. 1.
Wherein: front connector 1, fixed block 2, front skirt 3 (wherein: claw 31 installed by front skirt), winding layer 4, rear skirt 5 (wherein: after
Claw 51 installed by skirt), jet pipe 6 (wherein: converging portion 61, diffuser 62), water solublity quartz sand core 7 (wherein: leading portion 71, in
Between cylinder section 72, back segment 73), mandrel 8 (wherein: front axle 81, axis 82, rear axle 83, the conical surface 84), leading portion fixing device 9, rear end solid
Determine device 10, front end fixed flange 11, front end stationary jaw 12, technique end socket 13, annular groove 14.
Detailed description of the invention
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings, it is simple to more clearly understands this
Invention, but they do not constitute restriction to the present invention.
It is illustrated in figure 1 the electromotor composite material casing integrated formed structure of band jet pipe, multiple with electromotor including jet pipe 6
Condensation material housing, electromotor composite material casing includes housing body part and is connected to the front connector of housing body unit sub-headend
1, this integral formation method comprises the steps:
1) difference molding jet pipe 6, front connector 1, front skirt 3, rear skirt 5, water solublity quartz sand core 7 and mandrel 8；Wherein: water
The outer mold surface of insoluble quartz core mould 7 is consistent with profile in electromotor composite material casing；
In the present embodiment, water solublity quartz sand core 7 is 100: 4: 8 according to the weight ratio of quartz sand, polyethylene alcohol and water
Proportions quartz sand mixed glue, solidification obtain water solublity quartz sand core 7；Further, water solublity quartz sand core 7 is
Dividing four sections of sand molds, every section of sand mold is the most separately formed, and every section of sand mold is preset annular groove 14 time separately formed, wherein the sand of rear and front end
Type outer mold surface is consistent, such as elliposoidal with profile in electromotor composite material casing；When every section of sand mold is separately formed, every section of sand mold
Outer mold surface leaves machine and adds surplus, and end face is smooth, and after installation, the gap between adjacent sand mold uses Gypsum Fibrosum to be filled, then machine
It is added to consistent with profile in electromotor composite material casing；
Shown in Fig. 2, Fig. 5, mandrel 8 is divided into solid front axle 81, hollow middle shaft 82 and solid rear axle 83, front axle 81, in
Axle 82 and the independent machine added-time external diameter of rear axle 83 all leave machine and add surplus, integrally welded between front axle 81, axis 82 and rear axle 83,
And the axiality of guarantee each several part is added at postwelding machine；And be respectively arranged with and water solublity stone on front axle 81, axis 82 and rear axle 83
The keyway that key on sand core 7 matches, mandrel 8 and sand mold use key to carry out circumferentially fixed；And the cone of mandrel 8 rear axle 83
Face 84 is consistent with the interior profile of jet pipe 6 converging portion 61, to ensure laminating；
2) combine shown in Fig. 3, after water solublity quartz sand core 7 is sleeved on mandrel 8, at water solublity quartz sand core 7
Intermediate cylinder section 72 surrounding one layer of polytetrafluoroethylene film of parcel, at water solublity quartz sand core 7 leading portion 71 outer surface and at water
Insoluble quartz core mould 7 back segment 73 outer surface and extend to the conical surface 84 of mandrel 8 rear axle 83 and all brush one layer of releasing agent；Then exist
EPDM rubber insulation is all sticked on polytetrafluoroethylene film and remover；
3) front connector 1 is installed to the front end of water solublity quartz sand core 7 leading portion 71 after step 2 processes, and
Front connector 1 is connected with front end fixed flange 11, and front end fixed flange 11 is fixed on mandrel 8 by front end stationary jaw 12
On front axle 81；Jet pipe 6 is installed on mandrel 8 rear axle 83 so that the converging portion 61 of jet pipe 6 fits in water solublity quartz sand core
The rear end of 7 back segments 73 and the conical surface 84 of mandrel 8 rear axle 83, and, the end of jet pipe 6 diffuser 62 connects a technique end socket 13
(outer mold surface of this technique end socket 13 is ellipsoid, meets Double helix curve requirement), technique end socket 13 is by rear end fixing device
10 are fixed on mandrel 8 rear axle 83；It addition, be cased with fixed block 2 on mandrel 8 rear axle 83, and fixed block 2 serves as a contrast the diffusion at jet pipe 6
At section 62；In the present embodiment, technique end socket 13 and fixed block 2 are all coaxially fixed with mandrel 8, and technique end socket 13 is with fixed block 2 altogether
With ensureing the axiality of the axial gap of jet pipe 6 and jet pipe 6 and electromotor composite material casing, meanwhile, fixed block 2 is to mandrel
8 stressing conditions at jet pipe 6 larynx lining are improved, and overcome the restriction to core mandrel 8 of the jet pipe 6 larynx footpath, can protect well
The axial gap of card jet pipe 6 and with the control of electromotor composite material casing axiality；
4), after installing front connector 1 and jet pipe 6, front connector 1 outer surface and jet pipe 6 converging portion 61 outer surface are pasted ternary
EP rubbers heat insulation layer, to reach to be wound around state；Then hyperbola is used to be wound around, longitudinally wound with hoop, the mode combined
Exhausted to the ethylene propylene diene rubber of front connector 1 outer surface, water solublity quartz sand core 7 outer surface and jet pipe 6 converging portion 61 outer surface
Thermosphere carries out integration winding, and solidifies；Hyperbola is fiber reinforcement ring longitudinally wound being wound around, with hoop, the material that used
Epoxy resins；
5), after being wound around through step 4, solidifying, machine adding method is used to be gone by the redundance of jet pipe 6 diffuser 62 winding layer 4
Remove, and technique end socket 13 is removed；Shown in Fig. 4, then front skirt 3 is installed to water solublity quartz sand core 7 leading portion 71 and twines
In winding layer 4, the rear end that front skirt 3 installs claw 31 with front skirt is connected, and front skirt installs the front end of claw 31 by front end fixing device 9
It is fixedly installed on mandrel 8 front axle 81；Rear skirt 5 is installed on water solublity quartz sand core 7 back segment 73 winding layer 4, rear skirt 5 with
Rear skirt is installed the front end of claw 51 and is connected, and rear skirt is installed the rear end of claw 51 and is fixedly installed to mandrel by rear end fixing device 10
On 8 rear axles 83, then front skirt 3 and rear skirt 5 are wound solidification；Front skirt 3 and rear skirt 5 are wound around the material used and are fiber
Reinforced epoxy；
6) after front skirt 3 and rear skirt 5 wound and solidified complete, front skirt is installed claw 31, claw 51 installed by rear skirt, front end is fixed
Claw 12 and some associated fixture are removed successively, then from water solublity quartz sand core 7 front end giant to water solublity stone
Sand core 7 is rinsed dissolving core, and takes out mandrel 8 from front end, then removes water solublity quartz sand core 7 intermediate cylinder
The polytetrafluoroethylene film of section 72 surrounding parcel so that electromotor composite material casing inwall cleaning is clean, dries up the water of residual
Point, obtain the electromotor composite material casing of band jet pipe.
It is prepared for sending out of three band jet pipes by the electromotor composite material casing integral formation method of band jet pipe of the present invention
Motivation composite material casing, its average quality alleviates 20%, and motor mass fraction improves 3%, sending out of these three band jet pipes
Motivation composite material casing water pressure test burst pressure is 11.7MPa, 12.4MPa and 12.1MPa, designs requirement and is then
11MPa, it therefore meets the requirement of design, can as Solid Rocket Motor combustion chamber housing.
Claims (9)
1. an electromotor composite material casing integral formation method for band jet pipe, is by jet pipe (6) and electromotor composite
Housing quickness and high efficiency is combined into an overall process, and described electromotor composite material casing includes housing body part and is connected to
The front connector (1) of housing body unit sub-headend, it is characterised in that: described integral formation method comprises the steps:
1) difference molding jet pipe (6), front connector (1), front skirt (3), rear skirt (5), water solublity quartz sand core (7) and mandrel (8),
Wherein: the outer mold surface of water solublity quartz sand core (7) is consistent with profile in electromotor composite material casing；
2) after water solublity quartz sand core (7) being sleeved on mandrel (8), in water solublity quartz sand core (7) intermediate cylinder section
(72) one layer of polytetrafluoroethylene film is around wrapped up, at water solublity quartz sand core (7) leading portion (71) outer surface and water-soluble
Property quartz sand core (7) back segment (73) outer surface and extend to the conical surface (84) of mandrel (8) rear axle (83) and all brush a pull-up mould
Agent；Then on polytetrafluoroethylene film and remover, all stick EPDM rubber insulation；
3) front connector (1) is installed to through step 2) process after the front end of water solublity quartz sand core (7) leading portion (71)；Logical
Cross technique end socket (13) to be installed on mandrel (8) rear axle (83) by jet pipe (6), and the converging portion (61) of jet pipe (6) fits in water
The rear end of insoluble quartz core mould (7) back segment (73) and the conical surface (84) of mandrel (8) rear axle (83)；
4) after installing front connector (1) and jet pipe (6), to front connector (1) outer surface and jet pipe (6) converging portion (61) outer surface
Patch EPDM rubber insulation, then uses hyperbola to be wound around the mode combined to front connector (1) longitudinally wound with hoop
Outer surface, water solublity quartz sand core (7) outer surface and the EPDM rubber insulation of jet pipe (6) converging portion (61) outer surface
Carry out integration winding, and solidify；
5) through step 4) be wound around, solidify after, technique end socket (13) is removed, then front skirt (3) is installed to water solublity quartz
On core mould (7) leading portion (71) winding layer (4), rear skirt (5) is installed to water solublity quartz sand core (7) back segment (73) winding layer
(4) on, and front skirt (3) and rear skirt (5) are wound solidification；
6), after front skirt (3) and rear skirt (5) wound and solidified complete, the demoulding obtains the electromotor composite material casing of band jet pipe.
The electromotor composite material casing integral formation method of band jet pipe the most according to claim 1, it is characterised in that: institute
State step 1) in, water solublity quartz sand core (7) is 100 according to the weight ratio of quartz sand, polyethylene alcohol and water: (3～5): 8
Proportions quartz sand mixed glue, solidification obtains water solublity quartz sand core (7).
The electromotor composite material casing integral formation method of band jet pipe the most according to claim 1, it is characterised in that: institute
State step 1) in, water solublity quartz sand core (7) is point some sections of sand molds, and every section of sand mold is the most separately formed, every section of sand mold list
Alone becoming preset annular groove (14) during type, wherein the sand mold outer mold surface of rear and front end is consistent with profile in electromotor composite material casing.
The electromotor composite material casing integral formation method of band jet pipe the most according to claim 3, it is characterised in that: institute
State every section of sand mold separately formed time, the outer mold surface of every section of sand mold leaves machine and adds surplus, and end face is smooth.
The electromotor composite material casing integral formation method of band jet pipe the most according to claim 1, it is characterised in that: institute
State step 1) in, mandrel (8) is divided into solid front axle (81), hollow middle shaft (82) and solid rear axle (83), front axle (81), axis
(82) all leave machine add surplus, and upper point of front axle (81), axis (82) and rear axle (83) with rear axle (83) individually machine added-time external diameter
It is not provided with the keyway matched with the key on water solublity quartz sand core (7)；And the conical surface (84) of mandrel (8) rear axle (83) with
The interior profile of jet pipe (6) converging portion (61) is consistent.
The electromotor composite material casing integral formation method of band jet pipe the most according to claim 1, it is characterised in that: institute
State step 3) in, front connector (1) is connected with front end fixed flange (11), and front end fixed flange (11) is by the fixing card in front end
Pawl (12) is fixed on the front axle (81) of mandrel (8)；Being cased with fixed block (2) on mandrel (8) rear axle (82), fixed block (2) lining exists
Diffuser (62) place of jet pipe (6)；Technique end socket (13) is fixed on mandrel (8) rear axle (83) by rear end fixing device (10)
On, and technique end socket (13) and fixed block (2) all coaxially fix with mandrel (8).
The electromotor composite material casing integral formation method of band jet pipe the most according to claim 1, it is characterised in that: institute
State step 5) in, the rear end that front skirt (3) installs claw (31) with front skirt is connected, and front skirt is installed the front end of claw (31) and passed through front end
Fixing device (9) is fixedly installed on mandrel (8) front axle (81), and the front end that rear skirt (5) installs claw (51) with rear skirt is connected, after
Skirt is installed the rear end of claw (51) and is fixedly installed on mandrel (8) rear axle (83) by rear end fixing device (10).
The electromotor composite material casing integral formation method of band jet pipe the most according to claim 1, it is characterised in that: institute
State step 5) in, hyperbola is fiber reinforced epoxy resin longitudinally wound being wound around, with hoop, the material that used；Described step
6), front skirt (3) and rear skirt (5) are wound around the material used and are fiber reinforced epoxy resin.
The electromotor composite material casing integral formation method of band jet pipe the most according to claim 1, it is characterised in that: institute
State step 6) in, front skirt is installed claw (31), rear skirt installation claw (51) and front end stationary jaw (12) and removes, then from water-soluble
Property quartz sand core (7) front end giant is rinsed dissolving core to water solublity quartz sand core (7), and from front end
Take out mandrel (8), then remove the polytetrafluoroethylene film of water solublity quartz sand core (7) intermediate cylinder section (72) parcel around.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610586122.2A CN106217921B (en) | 2016-07-25 | 2016-07-25 | Engine composite material casing integral formation method with jet pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610586122.2A CN106217921B (en) | 2016-07-25 | 2016-07-25 | Engine composite material casing integral formation method with jet pipe |
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| CN106217921A true CN106217921A (en) | 2016-12-14 |
| CN106217921B CN106217921B (en) | 2018-06-22 |
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| CN107310821A (en) * | 2017-05-18 | 2017-11-03 | 上海空间推进研究所 | A kind of propellant tank skirt mounting structure and its manufacture method |
| CN107901468A (en) * | 2017-11-18 | 2018-04-13 | 湖北三江航天江北机械工程有限公司 | Solid propellant rocket composite material casing forming method |
| CN109653900A (en) * | 2018-11-29 | 2019-04-19 | 湖北航天技术研究院总体设计所 | A kind of forming method of dipulse solid engines powder charge combustion chamber |
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| CN112008920A (en) * | 2020-07-31 | 2020-12-01 | 湖北三江航天江北机械工程有限公司 | Core mold for producing rocket engine composite material shell and forming method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107310821A (en) * | 2017-05-18 | 2017-11-03 | 上海空间推进研究所 | A kind of propellant tank skirt mounting structure and its manufacture method |
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| CN110529293B (en) * | 2019-05-15 | 2022-06-21 | 内蒙古工业大学 | Solid rocket engine hot ball socket joint structural design |
| CN110529293A (en) * | 2019-05-15 | 2019-12-03 | 内蒙古工业大学 | A kind of solid propellant rocket hot-bulb socket and spigot joint header structure design |
| CN110705084A (en) * | 2019-09-26 | 2020-01-17 | 内蒙动力机械研究所 | Rapid design software system of composite shell |
| CN110805505A (en) * | 2019-11-15 | 2020-02-18 | 西安近代化学研究所 | Heat insulation layer assembly suitable for aluminum alloy long-tail nozzle solid rocket engine |
| CN112008920A (en) * | 2020-07-31 | 2020-12-01 | 湖北三江航天江北机械工程有限公司 | Core mold for producing rocket engine composite material shell and forming method thereof |
| CN112412658A (en) * | 2020-09-24 | 2021-02-26 | 上海新力动力设备研究所 | Combined core mold with medicine winding function |
| CN112412658B (en) * | 2020-09-24 | 2022-03-04 | 上海新力动力设备研究所 | Combined core mold with medicine winding function |
| CN113123897A (en) * | 2021-04-08 | 2021-07-16 | 内蒙古航天红岗机械有限公司 | Method for forming explosive column fixing frame of combustion chamber of solid rocket engine |
| CN113123897B (en) * | 2021-04-08 | 2023-12-01 | 内蒙古航天红岗机械有限公司 | Solid rocket engine combustion chamber grain fixing frame forming method |
| CN113107709A (en) * | 2021-04-28 | 2021-07-13 | 湖北航天技术研究院总体设计所 | Skirt structure of solid rocket engine shell, skirt assembly tool and skirt mounting method |
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