CN114229044B - Preparation method of revolving body heat-proof suit - Google Patents
Preparation method of revolving body heat-proof suit Download PDFInfo
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- CN114229044B CN114229044B CN202111368773.1A CN202111368773A CN114229044B CN 114229044 B CN114229044 B CN 114229044B CN 202111368773 A CN202111368773 A CN 202111368773A CN 114229044 B CN114229044 B CN 114229044B
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- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 238000003754 machining Methods 0.000 claims abstract description 30
- 238000012360 testing method Methods 0.000 claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 35
- 238000012545 processing Methods 0.000 claims description 34
- 239000003292 glue Substances 0.000 claims description 33
- 230000008569 process Effects 0.000 claims description 27
- 238000001514 detection method Methods 0.000 claims description 25
- 229910000831 Steel Inorganic materials 0.000 claims description 16
- 239000010959 steel Substances 0.000 claims description 16
- 229910052782 aluminium Inorganic materials 0.000 claims description 14
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 14
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 11
- 238000000227 grinding Methods 0.000 claims description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 9
- 239000004809 Teflon Substances 0.000 claims description 9
- 229920006362 Teflon® Polymers 0.000 claims description 9
- 229910052799 carbon Inorganic materials 0.000 claims description 9
- 238000005259 measurement Methods 0.000 claims description 9
- 238000004140 cleaning Methods 0.000 claims description 8
- 229920005989 resin Polymers 0.000 claims description 7
- 239000011347 resin Substances 0.000 claims description 7
- 239000004744 fabric Substances 0.000 claims description 6
- 238000005470 impregnation Methods 0.000 claims description 6
- 238000005498 polishing Methods 0.000 claims description 6
- 238000004804 winding Methods 0.000 claims description 6
- 239000000835 fiber Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 4
- 238000000465 moulding Methods 0.000 claims description 4
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 3
- 230000001680 brushing effect Effects 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 229910052731 fluorine Inorganic materials 0.000 claims description 3
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- 238000007789 sealing Methods 0.000 claims description 2
- 238000007711 solidification Methods 0.000 claims description 2
- 230000008023 solidification Effects 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- 238000004026 adhesive bonding Methods 0.000 description 9
- 238000007598 dipping method Methods 0.000 description 6
- 230000007547 defect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
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- 229910003460 diamond Inorganic materials 0.000 description 2
- 239000010432 diamond Substances 0.000 description 2
- 238000009659 non-destructive testing Methods 0.000 description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- 238000010146 3D printing Methods 0.000 description 1
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
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- 238000003825 pressing Methods 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64G—COSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR
- B64G1/00—Cosmonautic vehicles
- B64G1/22—Parts of, or equipment specially adapted for fitting in or to, cosmonautic vehicles
- B64G1/52—Protection, safety or emergency devices; Survival aids
- B64G1/58—Thermal protection, e.g. heat shields
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B11/00—Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding
- F16B11/006—Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding by gluing
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Health & Medical Sciences (AREA)
- Critical Care (AREA)
- Emergency Medicine (AREA)
- General Health & Medical Sciences (AREA)
- Remote Sensing (AREA)
- Aviation & Aerospace Engineering (AREA)
- Mechanical Engineering (AREA)
- Rolling Contact Bearings (AREA)
Abstract
The invention relates to a preparation method of a revolving body heat-proof suit, which comprises the following steps: a. manufacturing a prefabricated body of the heat-proof structure (1); b. machining the molded surface of the preform and supporting the tool (2); c. the heat-proof structure (1) and the side wall bearing structure (3) are subjected to test sleeving; d. and sleeving the heat-proof structure (1) and the side wall bearing structure (3). The invention can realize high-precision assembly of the heat-proof structure and the side wall bearing structure.
Description
Technical Field
The invention relates to a preparation method of a revolving body heat-proof suit.
Background
The small celestial body returning cabin side wall structure is formed by combining and bonding a side wall heat-proof structure, a small end heat-proof structure part and a returning cabin side wall load-carrying structure, the whole structure height is 222mm, the load-carrying structure is 207+/-0.5 mm, the total of the small end heat-proof structure and a glue layer is 15mm, the small end heat-proof structure is 14mm, the glue layer is 1mm high, the maximum outer diameter phi 643mm of the large end of the side wall heat-proof structure is larger than the diameter phi 634mm of the joint with the outsole, the thickness of the heat-proof structure is 8.5mm, the wall thickness of the load-carrying structure is 1mm, and the appearance half cone angle of the whole structure is 31 o 1'. The process characteristics and difficulties of the method are as follows:
first, the bonding gap between the side wall heat-proof structure and the bearing structure is difficult to control. Namely, the side wall heat-proof structure adhesive interface is integrally formed, the bearing structure appearance surface is formed by 3D printing, and the difference of the contour degrees of the two product adhesive bonding surfaces is caused due to the difference of forming modes, so that the change of adhesive bonding gaps can be caused by the difference of the contour degrees. Meanwhile, the glue coating amount of the glue joint interface is high in uniformity control difficulty in the sleeving process, the coaxiality of the heat-proof structure and the metal bearing structure is high in control difficulty in the sleeving process, and the thickness of the glue layer is difficult to ensure. This makes it difficult to control the gap between the heat-resistant structure and the load-bearing structure. In addition, the prior art also has difficulty in achieving nondestructive testing of the composite bonding process. Specifically, the side wall heat-proof structure is a cone-shaped structure, silicon rubber is adopted between the heat-proof structure and the bearing structure for cementing, the rigidity is lower because the heat-proof structure is in a light porous state, and the time difference of the knocking detection sound bullet in the defect area and the normal area is smaller, the detection sensitivity is lower, so that the detection requirement is difficult to reach. The bearing structure is a compact aluminum alloy with the thickness of 1mm, and the conventional pulse reflection contact ultrasound is difficult to distinguish between the initial wave and the bottom wave, so that the common plate bonding detection method is not suitable for the structure. Finally, although the ultrasonic phased array detection method can use acoustic linear focusing to distinguish bottom wave attenuation caused by defects so as to realize defect detection of planar products, the side wall heat release structure is a tapered structure with variable curvature, and a complex bulge structure exists in the side wall heat release structure, so that the detection of the cementing quality of an interface is difficult.
In the prior art, the transformation and experimental study of the ultrasonic phased array probe are needed, and a nondestructive testing method for the cementing quality after sleeving is explored. In addition, the existing heat-proof suit preparation is difficult to realize high-precision combination processing. Specifically, because a great number of characteristic dimensions and higher precision requirements exist in the side wall heat-proof structure, especially the characteristic dimensions of the bearing structure reach the design requirement values, and a great number of characteristics are shielded by the heat-proof structure blank in the process of machining the heat-proof structure suit combination, the precision control in the machining process is difficult.
Disclosure of Invention
The invention aims to provide a preparation method of a revolving body heat-proof suit.
In order to achieve the aim of the invention, the invention provides a preparation method of a revolving body heat-proof suit, which comprises the following steps:
a. manufacturing a prefabricated body of the heat-proof structure;
b. machining the molded surface of the preform and supporting the tooling;
c. the heat-proof structure and the side wall bearing structure are subjected to test sleeving;
d. and sleeving the heat-proof structure and the side wall bearing structure.
According to one aspect of the present invention, in the step (a), fabricating the preform of the heat-shielding structure includes molding, dip-curing, and drying.
According to one aspect of the invention, forming a female die, laying a fiber net tyre on the surface of the female die, connecting net tyre layers through needling, and performing flaw detection after forming a preform;
preparing resin impregnation glue solution, placing the preform in an impregnation tool, sealing, gradually impregnating the resin glue solution from the bottom of the preform to the top of the preform by vacuumizing, and baking the preform until the glue solution forms gel by using an oven;
and cleaning gel blocks around the preform, and drying the preform.
According to one aspect of the present invention, in the step (b), the profile processing of the preform includes:
placing the small end of the preform on a table top of a machine tool upwards, and processing the end face of the small end;
placing the small end of the preform downwards on a table surface of a machine tool, and centering a conical axis reference by using a small end reference surface;
machining a large end face of the prefabricated body, and uniformly machining first positioning through holes with diameter of 20mm at 8 positions around the large end flanging according to an axis reference;
machining the inner molded surface of the preform according to an axis reference, wherein the machining size is 11mm, so that the half cone angle of the inner molded surface is 31 degrees (-1' -0), and the overall profile of the inner molded surface is 0.1mm;
when the inner molded surface of the prefabricated body is machined, rough milling is firstly carried out, 2mm allowance is reserved, then grinding is carried out by adopting a grinding wheel until the machining size is reached, and the cutting amount of each cutter is not more than 0.5mm;
turning over the preform, aligning the axis according to the circle center of the first positioning through hole, and processing the outer molded surface;
and (5) processing the upper flanging of the large end of the preform to form a heat-proof structure, and removing and cleaning the clamp.
And a positioning aluminum block is diagonally arranged on the first positioning through hole on the large turnup at the position 3.
According to one aspect of the invention, in the step (b), the supporting tool is machined according to the pin holes at the two positions of the large end of the side wall bearing structure, and machining reference surfaces and quadrant marks are built on the upper surface and the lower surface of the turning edge of the supporting tool.
According to one aspect of the invention, the bottom surface of the flanging of the supporting tool is processed, and the flatness is less than 0.1mm;
turning the supporting tool, and processing two phi 5 (0 to +0.05) positioning pin holes according to the alignment axis of the outer circle of the small end flanging, wherein the distance is 600+/-0.02 mm;
processing a second positioning through hole with the diameter of 4.5 at the position of 8 at the position of 600mm of the reference circle, and matching the second positioning through hole with the diameter of 5;
machining a quadrant hole of phi 20 at the 4 positions of the reference circle of phi 850, and performing quadrant marking on the surface of the tool;
machining a threaded through hole of M10 at 8 at the position of the reference circle phi 764;
the upper surfaces of the small end and the large end of the processing support tool are processed, the flatness is 0.05mm, and the distance between the upper end surface and the lower end surface is 98+/-0.1 mm.
According to one aspect of the invention, in said step (c), the side wall load bearing structure is cleaned using alcohol or acetone;
adopting M4 screws, nuts and positioning pins to connect and fix the side wall bearing structure with the supporting tool through the bottom large end connecting hole;
performing contour degree three-dimensional measurement on the surface of the side wall load bearing structure to form a three-dimensional virtual model, and recording contour values on the surface of the side wall load bearing structure;
performing three-dimensional scanning measurement on the profile of the heat-proof structure to form a three-dimensional virtual model, and recording the profile value on the inner surface of the heat-proof structure;
virtually sleeving the three-dimensional scanning model of the side wall load-bearing structure and the heat-proof structure, adjusting the combination position of the side wall load-bearing structure and the heat-proof structure according to the profile value, and making a profile adjustment mark on the surface of the side wall load-bearing structure;
pasting 20 x 2mm heat-proof material sheets on the mark positions below-0.5 mm according to mark points and profile values of the surface of the side wall load-bearing structure, and then carrying out integral grinding to correct the profile of the side wall load-bearing structure to (-0.5, 0) mm;
bonding 12K carbon wires in a marking area of a negative difference position of the side wall bearing structure, wherein the carbon wire intervals are 10mm, measuring the height of the carbon wires after solidification, polishing, and correcting the profile value meeting the marking area;
polishing the outer surface of the side wall bearing structure, and comprehensively cleaning the upper end surface and the lower end surface by using alcohol or acetone.
According to one aspect of the invention, two layers of Teflon plugs are stuck to the large openings at the 4 sides of the periphery of the side wall bearing structure, and Teflon cloth is stuck to the inner part and the bottom edge of the small holes at the 14 positions below the wall of the side wall bearing structure for protection;
after the profile of the heat-proof structure and the profile of the side wall bearing structure are adjusted, the locating pin penetrates through the 3 first locating through holes of the flanging at the large end of the heat-proof structure, the bottom surface of the locating pin is adhered and fixed with the surface of the supporting tool, the distance between the position of the first locating through holes of the flanging at the large end of the heat-proof structure and the plane of the supporting tool is measured, and the height limiting block is processed accordingly.
According to one aspect of the invention, the side wall bearing structure corresponds to a support tool quadrant, and the large end is fixedly connected with the support tool through 2 positioning pins and 8 screws;
the side wall bearing structure surface is laterally provided with an opening at 4 positions, a hole at 14 positions below the side wall bearing structure surface and the upper end face and the lower end face of the side wall bearing structure are protected by Teflon.
The heat-proof structure is sleeved on the side wall bearing structure in a test mode, so that the locating pin penetrates through a hole with a locating aluminum block at the large end flanging of the heat-proof structure;
uniformly taking 8 points to measure the gap between the heat-proof structure and the side wall bearing structure, and adjusting the gap to be 0.2mm;
and measuring the distance between the typical position of the upper flanging of the large end of the heat-proof structure and the plane of the supporting tool, and processing a height limiting block with the height equal to the distance.
According to one aspect of the invention, in said step (d), the surface of the heat protective structure is wiped clean with alcohol;
brushing PR1200 primer on the bonding surface of the side wall bearing structure and the heat-proof structure, and airing for 0.5h at normal temperature;
winding first steel wires with the spacing of 50mm and 0.2mm on the surface of the side wall load-bearing structure, and winding second steel wires with the spacing of 0.1mm and 50mm along the circumferential direction of the parent direction on the inner surface of the heat-resistant structure;
per component a (RTV 560): the weight ratio of the component B (DBT) is 100:0.5 preparing RTV560 glue solution, wherein the component B is calculated according to 0.022g per drop, and is added according to the drop, and fully and uniformly stirring;
the bonding surface between the side wall bearing structure and the heat-proof structure is not less than 250g/m 2 Coating RTV560 glue, and taking out the steel wire;
placing a support tool with a side wall bearing structure on the surface of a base sleeved with a pressurizing tool, and placing a height limiting block on the flanging surface of the support tool;
enabling a first positioning through hole at the 3-position flange of the large end of the heat-proof structure to penetrate through a positioning pin at the 3-position of the surface of the supporting tool;
a layer of steel plate is arranged between a pressure head sleeved with a pressurizing tool and a heat-proof structure, a pressure sensor is arranged at the center of the steel plate and the pressure head, and two layers of fluorine cloth are padded between the pressure sensor and the pressure head;
and (3) pressurizing the small end flanging by 10kg, if the heat-proof structure does not decline in the pressurizing process, placing a pressure equalizing aluminum plate on the surface of the large end flanging until the heat-proof structure contacts with the height limiting block, so that the glue solution slowly flows out from one side of the large end, and then solidifying for 24 hours at room temperature.
And sending the packaged structure to physical and chemical detection, carrying out ultrasonic flaw detection on the glued joint surface, and giving a detection report.
According to the scheme of the invention, in the process of sleeving and preparing the heat-proof structure on the side wall of the return cabin, the inner molded surface of the heat-proof structure is firstly processed to the theoretical size, then the side wall load-carrying structure is connected with the supporting tool, the datum of the load-carrying structure is transferred to the surface of the supporting tool, and the outline of the cementing surface is adjusted according to the outline of the side wall load-carrying structure. Then, the heat-proof structure and the side wall bearing structure are sleeved in a test mode, the cementing gap is guaranteed, and the position of the heat-proof structure is fixed with the supporting tool through the locating pin. And then the heat-proof structure and the side wall bearing structure are subjected to sleeved gluing, and the sleeved pressurizing tool and the large-end uniform plate are used for pressurizing and adjusting, so that the test loading state is met. And then, processing the heat-proof structure, removing the flanging, leaving 3mm allowance in appearance, then carrying out combined gluing on the small-end heat-proof structure component, and carrying out final size processing and forming on the heat-proof structure and the small-end heat-proof structure component after the gluing is finished. Therefore, the sleeving process comprises the processes of processing the inner profile of the blank, testing the heat-proof structure, sleeving the heat-proof structure, installing and processing the small-end heat-proof frame and the like, and is mainly carried out aiming at the control of the cementing gap and the profile, thereby realizing high-precision assembly.
Drawings
FIG. 1 schematically illustrates a flow chart for forming a heat shield structure in accordance with one embodiment of the present invention;
FIG. 2 schematically illustrates a block diagram of a heat shield structure preform according to one embodiment of the present invention;
FIG. 3 schematically illustrates a preform X-ray inspection view of one embodiment of the present invention;
fig. 4 and 5 are views schematically showing two views of a preform dip-curing process according to an embodiment of the present invention, respectively;
fig. 6 and 7 are views schematically showing two views of a preform drying process according to an embodiment of the present invention, respectively;
FIGS. 8 and 9 are two flow charts schematically illustrating the nesting and processing of heat shields and side wall load carrying structures, respectively, in accordance with one embodiment of the present invention;
FIG. 10 schematically illustrates a schematic view of a small end-face machined in a method of manufacturing a heat jacket for a rotor in accordance with one embodiment of the present invention;
FIG. 11 schematically illustrates a reference and machined inner profile and large end surface for a method of manufacturing a heat jacket for a rotor in accordance with one embodiment of the present invention;
FIG. 12 schematically illustrates a process profile and large end flange in a method for preparing a heat jacket for a rotor according to one embodiment of the present invention;
FIGS. 13 and 14 are two perspective views schematically illustrating preform processing according to an embodiment of the present invention;
FIGS. 15 and 16 are block diagrams schematically illustrating two views of a positioning aluminum block according to an embodiment of the present invention, respectively;
FIG. 17 schematically illustrates a position diagram of a glue-positioned aluminum block according to an embodiment of the invention;
FIG. 18 schematically illustrates a support tooling with a large end facing up according to one embodiment of the present invention;
FIG. 19 schematically illustrates a support tooling registration pin hole and quadrant hole tooling for one embodiment of the present invention;
FIG. 20 schematically illustrates a support tooling with a small end facing up according to one embodiment of the present invention;
FIG. 21 is a schematic illustration of an external structural view of a side wall load carrying structure in accordance with an embodiment of the present invention after attachment to a support tooling;
FIG. 22 is a schematic representation of a three-dimensional measurement of sidewall load bearing structure profile according to one embodiment of the present invention;
FIG. 23 schematically illustrates a three-dimensional measurement of thermal protection structure profile for one embodiment of the present invention;
FIG. 24 schematically illustrates a virtual assembly view of a three-dimensional model of a heat shield structure and a side wall load bearing structure in accordance with one embodiment of the present invention;
FIG. 25 schematically illustrates a sidewall load bearing structure profile measurement of one embodiment of the present invention;
FIG. 26 schematically illustrates a side wall load carrying structure profile modification and combined machining and polishing in accordance with one embodiment of the present invention;
FIG. 27 schematically illustrates profile adjustment according to an embodiment of the present invention;
FIG. 28 is a cross-sectional view taken along E-E of FIG. 27;
FIG. 29 schematically illustrates a side wall load bearing structure surface hole treatment schematic of an embodiment of the present invention;
FIG. 30 schematically illustrates a sidewall load bearing structure aperture position protection schematic of an embodiment of the invention;
FIG. 31 schematically illustrates a positioning of a heat shield structure and a support tooling according to an embodiment of the present invention;
FIG. 32 schematically illustrates a schematic diagram of a test kit according to one embodiment of the present invention;
FIG. 33 schematically illustrates a schematic view of the arrangement of surface wires of a heat shield structure in accordance with one embodiment of the present invention;
FIG. 34 schematically illustrates a side wall load carrying structure surface wire arrangement in accordance with one embodiment of the present invention;
FIG. 35 schematically illustrates a thermal protection structure and sidewall load bearing structure suit pressurization schematic of an embodiment of the present invention;
fig. 36, 37 and 38 are schematic views schematically showing three views during a packing process according to an embodiment of the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments will be briefly described below. It is apparent that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
In describing embodiments of the present invention, the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in terms of orientation or positional relationship shown in the drawings for convenience of description and simplicity of description only, and do not denote or imply that the devices or elements in question must have a particular orientation, be constructed and operated in a particular orientation, so that the above terms are not to be construed as limiting the invention.
The present invention will be described in detail below with reference to the drawings and the specific embodiments, which are not described in detail herein, but the embodiments of the present invention are not limited to the following embodiments.
The preparation method of the revolving body heat-proof suit is suitable for the field of low-density heat-proof structure forming, and can be used for forming the heat-proof structure of the revolving body return cabin of the asteroid detection and deep space detection aircraft. Firstly, manufacturing a prefabricated body (blank) of a heat-proof structure 1, then machining the molded surface of the prefabricated body and a supporting tool 2, then performing test sleeving on the heat-proof structure 1 and a side wall bearing structure 3, and finally sleeving on the heat-proof structure 1 and the side wall bearing structure 3.
Referring to fig. 1, fabricating the preform of the heat protection structure 1 includes molding, dip curing, and drying. In order to meet the design requirements of the density control of the side wall heat-proof structure 1, the fiber preform molding control and the uniformity control in the preform resin impregnation process are two important processes of the density of the side wall heat-proof structure 1 reaching the design requirements. Specifically, in the process of forming the preform of the NF3010 heat-proof structure 1, firstly, forming a female die according to the configuration size of the product, laying a fiber net tire on the surface of the female die, and realizing the connection between net tire layers by needling, so that the preform forms a three-dimensional net tire needled felt structure, as shown in fig. 2, the forming process requires strict control of net tread density, needling depth, needling density and density uniformity, and monitoring of the forming process, so as to realize control of the density and uniformity of the preform.
After the preform is formed, the preform is put into a factory to carry out flaw detection by adopting a nondestructive detection means so as to detect the internal forming quality of the preform according to the X-ray detection Specification of NF series heat-resistant materials (BYWYZ 0175). As shown in FIG. 3, the internal quality was good after flaw detection, and defects such as voids, inclusions, and density unevenness were not found. Then, according to the density control requirement of the side wall preform, in the process of dipping the preform, resin dipping glue solution is calculated and configured, and the formed fiber preform is placed in a dipping tool and sealed, as shown in fig. 4 and 5. The resin glue solution is gradually immersed from the bottom to the upper part of the preform to completely submerge the top of the preform by vacuumizing, so that the phenolic resin immersed preform is ensured to be full and uniform. And then, the whole tool is placed in a drying oven D, and the drying oven is utilized to bake until the glue solution reacts to form gel, so that the dipping and curing in the preform are completed. Wherein the weight change during preform impregnation is shown in table 1 below:
table 1 record table of preform dipping process
Finally, after the preform gel reaction is finished, the dipping tool is disassembled, redundant gel blocks around the preform are cleaned, the processed preform is placed in the tool for drying treatment, and the preform is also connected with a thermocouple C, so that the NF3010 heat-proof structure 1 is molded and prepared as shown in fig. 6 and 7. Wherein, each data of the blank drying process is shown in the following table 2:
table 2 record table of drying process of blank
Then, in order to meet the requirement of the bonding gap between the heat-proof structure 1 of the side wall structure and the side wall load-carrying structure 3, namely, in the process of sleeving bonding, the bonding quality control of the bonding gap between the heat-proof structure 1 and the side wall load-carrying structure 3 is also carried out. According to the technical requirements of the sleeving of the side wall structure of the return cabin, the process schemes of sleeving the heat-proof structure 1 and the bearing structure, installing the small-end heat-proof component, integrally machining and the like are formulated, as shown in fig. 8 and 9.
According to the invention, the test sleeving is carried out before the sleeving, the gap between the heat-proof structure 1 and the side wall load-bearing structure 3 is uniformly adjusted, the height position between the end of the heat-proof structure 1 and the tool plane is determined, and finally, the cementing sleeving state and the pressurizing in-place position are determined. In the gluing process, steel wires with equal height are evenly paved on the surface of the heat-proof structure 1 and the surface of the side wall load-bearing structure 3 of the gluing layer, so that the uniformity and thickness of gluing are controlled. The sleeving process adopts a special sleeving tool to pressurize, the heat-proof structure 1 is sleeved on the side wall bearing structure 3 along the positioning pin 23 of the sleeving tool, and the pressing head of the sleeving tool is utilized to spin to the height position confirmed by the test sleeving, so that the sleeving is completed.
In the profile processing of the preform, a route of rough processing and then finish processing is adopted according to the characteristics and processing requirements of the heat-proof structure 1. Wherein, the rough machining adopts a 32 diamond ball knife with the rotating speed of 3500r/min, the feeding of 3000mm and the cutting of 2mm, the finish machining adopts a diamond particle grinding head with the rotating speed of 3500r/min, the feeding of 1500mm and the grinding quantity of 0.5-1mm.
Referring to fig. 10 to 12, first, the preform is placed with its small end facing upward on the table of the machine tool, and the small end face 1a is roughly swept to be flat. And then placing the small end of the preform downwards on a table surface of a machine tool, and marking a surface with a small end reference surface A to align the axis reference B of the cone. Then, the large end face 1B of the prefabricated body is processed, the same is seen to be flat, and 8 first positioning through holes 11 with phi of 20mm are uniformly processed around the large end flanging according to the axis reference B and are used for installing and positioning the aluminum block 12 later. And (3) machining the inner molded surface 1c of the preform according to the axis reference B, wherein the machining size is 11mm, the half cone angle of the inner surface is 31 degrees (-1' -0), and the overall profile of the inner surface is 0.1mm. Wherein, rough milling is firstly carried out when the inner molded surface of the prefabricated body is processed, 2mm allowance is reserved, then grinding is carried out by adopting a grinding wheel until the processing size is reached, and the cutting amount of each cutter is not more than 0.5mm. And then turning over the preform, aligning the axis according to the circle center of the first positioning through hole 11 at the 8 positions, and processing the outer molded surface until the outer molded surface is flat. Subsequently, the upturned edge 1E of the large end face of the preform is processed to form the heat-shielding structure 1, which is then disassembled and cleaned, and the inside of the preform is also provided with a verification template E, as shown in fig. 13 and 14. Finally, as shown in fig. 15 and 17, the aluminum block 12 is positioned by adopting J-133 cementing at the diagonal position of 3 selected positions in the first positioning through hole 11 at 8 positions of the large end flanging.
Referring to fig. 18 to 21, the machining of the support tooling 2 and the mounting of the side wall load bearing structure 3 is then performed. Specifically, a reference is established on the surface of the supporting tool 2, namely, the supporting tool 2 is processed according to the two pin holes at the large end of the side wall bearing structure 3 as the reference, and a processing reference surface and a quadrant hole 21 are established on the upper surface and the lower surface of the flanging of the supporting tool 2. Then, the bottom surface of the flanging of the supporting tool 2 is processed, and the flatness is better than (smaller than) 0.1mm. And turning over the supporting tool 2, aligning the axle center according to the outer circle of the small end flanging, and processing two positioning pin holes 24 with phi 5 (0 to +0.05) according to requirements, wherein the distance is 600+/-0.02 mm. Subsequently, uniformly processing a second positioning through hole 22 with the diameter of 4.5 at 8 positions at the position of the reference circle with the diameter of 600mm, and matching the second positioning through hole with the diameter of 5 to form a positioning pin 23 with the diameter of 5; and processing a quadrant hole 21 of phi 20 at the position of 4 of the reference circle phi 850, ensuring that the reference circle of the quadrant hole 21 is concentric with the reference circle of the second positioning through hole 22, and performing quadrant marking on the surface of the tool for standby. The threaded through hole 26 of M10 at 8 is machined at a pitch circle Φ764. The upper surfaces of the small end and the large end of the processing support tool 2 are processed, the flatness is 0.05mm, and the distance between the upper end surface and the lower end surface is 98+/-0.1 mm. The side wall load bearing structure 3 is then cleaned thoroughly using alcohol or acetone. And the side wall bearing structure 3 is fixedly connected with the support tool 2 through a bottom large end connecting hole by adopting M4 screws, nuts and phi 5 locating pins 23.
Referring to fig. 22 to 24, the profile of the side wall load bearing structure 3 and the heat shielding structure 1 is then detected and corrected. Specifically, performing contour three-dimensional measurement on the surface of the side wall load bearing structure 3 to form a three-dimensional virtual model, and recording a contour value on the surface of the structure; and carrying out three-dimensional scanning measurement on the profile of the heat-proof structure 1 to form a three-dimensional virtual model, and recording the profile value on the inner surface of the heat-proof structure 1. And virtually sleeving the three-dimensional scanning model of the side wall bearing structure 3 and the heat-proof structure 1, adjusting the optimal combination position of the side wall bearing structure 3 and the heat-proof structure 1 according to the profile tolerance value, and marking the profile tolerance adjustment mark on the surface of the side wall bearing structure 3, wherein a detection point F is shown in fig. 25. According to the contour degree detection of the side wall load-bearing structure 3, if the whole circle of the edge of the large end and the local outer contour degree of the middle part do not meet the requirement of the contour degree (-0.5, 0) mm, the side wall load-bearing structure 3 does not have a sleeved gluing state with the heat-proof structure 1. The profile of the side wall load-carrying structure 3 is modified by adopting the material which is the same as the heat-proof structure 1. And (3) pasting 20 x 2 mNFF 3010 heat-proof material sheets G (or called repair sheets) on mark positions smaller than-0.5 mm according to mark points and profile values of the metal surface of the side wall load-bearing structure 3, then carrying out integral machining polishing to ensure the profile of the side wall load-bearing structure 3 after repairing the heat-proof material, correcting the profile of the side wall load-bearing structure 3 to (-0.5, 0) mm, and enabling the side wall load-bearing structure 3 to be in a state before and after correction as shown in figures 26-28.
Referring to fig. 27 and 28, carbon wires 31 of 12K are glued and laid by using J-133 glue in the marked area of the negative difference position of the side wall load bearing structure 3, the carbon wires 31 are arranged at intervals of 10mm, and after curing, the height of the carbon wires 31 is measured and polished, and the profile value satisfying the marked area is corrected. The outer surface of the side wall bearing structure 3 is ground comprehensively, the upper end face and the lower end face are protected during grinding, and alcohol or acetone is used for cleaning the upper end face and the lower end face comprehensively.
Referring to fig. 29 and 30, the corresponding side wall load bearing structure 3 of the present invention has a large circular hole 33, a square hole 34, an elliptical hole 35, and a small circular hole 36. The invention carries out corresponding treatment on the open pores on the surface of the metal cabin. Specifically, two layers of Teflon plugs are adhered to the large openings at the 4 parts of the periphery of the side wall bearing structure 3 to prevent glue solution pollution. Finally, the inner and bottom edges of the small holes at the lower part 14 of the wall of the side wall load-carrying structure 3 are protected by Teflon cloth. Subsequently, the profile degrees of the heat-proof structure 1 and the side wall bearing structure 3 are adjusted, the locating pin 23 penetrates through the first locating through hole 11 at the 3-position of the flanging at the large end of the heat-proof structure 1, the bottom surface of the locating pin 23 is adhered and fixed with the surface of the supporting tool 2, the distance between the position of the first locating through hole 11 at the large end of the heat-proof structure 1 and the plane of the supporting tool 2 is measured, and the height limiting block 4 is processed accordingly. Specifically, when the heat-proof structure 1 and the side wall bearing structure 3 are in test set, the side wall bearing structure 3 corresponds to the quadrant of the supporting tool 2, and the large end is fixedly connected with the supporting tool 2 through 2 positioning pins 23 and 8 screws. The surface side of the side wall bearing structure 3 is laterally provided with an opening at 4, a hole at 14 below, upper and lower end surfaces of the side wall bearing structure 3 and the like are protected by Teflon to prevent glue solution pollution, as shown in figure 30.
Referring to fig. 31, the heat-proof structure 1 is sleeved on the side wall bearing structure 3 in a test mode, so that the positioning pins 23 (or guide pins) penetrate through the first positioning through holes 11 with the positioning aluminum blocks 12 at three positions of the large end flanges of the heat-proof structure 1, and the bottom surfaces of the positioning pins 23 and the surface of the supporting tool 2 are adhered and fixed by 502 glue. And uniformly taking 8 points to measure the gap between the heat-proof structure 1 and the side wall bearing structure 3, and adjusting the gap to be consistent with the gap at the 8 points, wherein the final size is as follows: 0.2mm , 0.2mm , 0.2mm , 0.2mm , 0.2mm , 0.2mm , 0.2mm , 0.2mm. . Then, the distance between the typical position of the upturn at the large end of the heat-proof structure 1 (namely, the position of the opening at 8 positions) and the plane of the supporting tool 2 is measured, and according to the distance, the height limiting blocks 4 at different positions with the same height as the distance are processed for standby use, and the test set state is shown in fig. 32.
Referring to fig. 33 to 35, after the profile of the heat-shielding structure 1 and the side wall load-carrying structure 3 are adjusted, the heat-shielding structure 1 and the side wall load-carrying structure 3 are sleeved. Specifically, the heat-proof structure 1 is firstly wiped and decontaminated with alcohol for standby. And brushing a layer of PR1200 primer on the bonding surface of the side wall bearing structure 3 and the heat-proof structure 1, airing at normal temperature for 0.5h, and airing the primer for later use. Uniformly winding and fixing the first steel wires 32 with the interval of 0.2mm on the surface of the side wall load-bearing structure 3, and winding and fixing the second steel wires 12 with the interval of 0.1mm along the circumferential direction of the parent direction along the inner surface of the heat-proof structure 1 with the interval of 50 mm. Per component a (RTV 560): component b (DBT) weight ratio 100:0.5 preparing RTV560 glue solution, wherein the component B is calculated according to 0.022g per drop, and is added according to the drop, and fully stirred until the visual color is uniform. The bonding surface between the side wall bearing structure 3 and the heat-proof structure 1 is not less than 250g/m 2 The RTV560 glue is evenly coated, and then the steel wire is taken out to prepare the suit.
Subsequently, the support tool 2 with the side wall load bearing structure 3 is placed in the center of the surface of the base 61 sleeved with the pressurizing tool 6, and the height limiting block 4 is placed on the flanging surface of the support tool 2. The three first positioning through holes 11 of the large end flange of the heat-proof structure 1 penetrate through the three positioning pins 23 on the surface of the supporting tool 2, so that the heat-proof structure is sleeved on the surface of the side wall bearing structure 3. A layer of steel plate 63 is arranged between the pressure head 62 sleeved with the pressurizing tool 6 and the heat-proof structure 1, a pressure sensor 64 is arranged at the center of the steel plate 63 and the pressure head 62, and two layers of fluorine cloth are padded between the pressure sensor 64 and the pressure head 62 so as to avoid rotation of the pressure sensor in the pressurizing process. The heat-proof structure 1 is naturally located on a metal structure along the sleeve locating pin 23, the pressure head 62 at the upper end of the tool is utilized to slowly pressurize 10kg to the small-end flanging, if the heat-proof structure 1 does not descend in the pressurizing process, the pressure equalizing aluminum plate 66 is placed on the surface of the large-end flanging, the bolts 661 on the pressure equalizing aluminum plate 66 are connected with the threaded through holes 26 on the surface of the supporting tool 2, the bolts are symmetrically fastened around, the height of the large-end flanging and the supporting tool 2 is adjusted through the pressure equalizing aluminum plate 66 until the heat-proof structure 1 reaches the position of the height limiting block 4 and contacts with the height limiting block, sleeve pressurizing is stopped, and sleeve pressurizing is completed. The entire process takes about 50 minutes and the glue set is completed before the glue begins to cure (about 2 hours), as shown in fig. 36-38. Finally, the glue solution slowly flows out from the big end side, the glue solution overflow area H is shown in figure 37, the glue solution is cleaned in time during the period, and the glue solution is solidified for 24 hours at room temperature. And sending the packaged structure to physical and chemical detection, carrying out ultrasonic flaw detection on the glued joint surface, and giving a detection report.
The above description is only one embodiment of the present invention and is not intended to limit the present invention, and various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A preparation method of a revolving body heat-proof suit comprises the following steps:
(a) Manufacturing a prefabricated body of the heat-proof structure;
(b) Machining the molded surface of the preform and supporting the tooling;
(c) Fitting the heat-proof structure and the side wall bearing structure;
(d) Sleeving the heat-proof structure and the side wall bearing structure;
in said step (c), cleaning the side wall load bearing structure with alcohol or acetone;
adopting M4 screws, nuts and positioning pins to connect and fix the side wall bearing structure with the supporting tool through the bottom large end connecting hole;
performing contour degree three-dimensional measurement on the surface of the side wall load bearing structure to form a three-dimensional virtual model, and recording contour values on the surface of the side wall load bearing structure;
performing three-dimensional scanning measurement on the profile of the heat-proof structure to form a three-dimensional virtual model, and recording the profile value on the inner surface of the heat-proof structure;
virtually sleeving the three-dimensional scanning model of the side wall load-bearing structure and the heat-proof structure, adjusting the combination position of the side wall load-bearing structure and the heat-proof structure according to the profile value, and making a profile adjustment mark on the surface of the side wall load-bearing structure;
pasting 20 x 2mm heat-proof material sheets on the mark positions below-0.5 mm according to mark points and profile values of the surface of the side wall load-bearing structure, and then carrying out integral grinding to correct the profile of the side wall load-bearing structure to (-0.5, 0) mm;
bonding 12K carbon wires in a marking area of a negative difference position of the side wall bearing structure, wherein the carbon wire intervals are 10mm, measuring the height of the carbon wires after solidification, polishing, and correcting the profile value meeting the marking area;
polishing the outer surface of the side wall bearing structure, and comprehensively cleaning the upper end surface and the lower end surface by using alcohol or acetone;
two layers of Teflon plugs are stuck to the large openings at the side 4 of the periphery of the side wall bearing structure, and Teflon cloth is stuck to the inner part and the bottom edge of the small hole at the position 14 below the side wall bearing structure wall for protection;
after the profile degrees of the heat-proof structure and the side wall bearing structure are adjusted, a locating pin penetrates through a first locating through hole at 3 parts of the flanging at the large end of the heat-proof structure, the bottom surface of the locating pin is adhered and fixed with the surface of a supporting tool, the distance between the position of the first locating through hole at the upper flanging at the large end of the heat-proof structure and the plane of the supporting tool is measured, and a height limiting block is processed according to the distance;
the side wall bearing structure corresponds to a support tool quadrant, and the large end is fixedly connected with the support tool through 2 positioning pins and 8 screws;
the lateral direction 4 of the surface of the side wall bearing structure is provided with an opening, the lower part 14 is provided with a hole, and the upper end face and the lower end face of the side wall bearing structure are protected by Teflon;
the heat-proof structure is sleeved on the side wall bearing structure in a test mode, so that the locating pin penetrates through a hole with a locating aluminum block at the large end flanging of the heat-proof structure;
uniformly taking 8 points to measure the gap between the heat-proof structure and the side wall bearing structure, and adjusting the gap to be 0.2mm;
measuring the distance between the typical position of the upper flanging of the large end of the heat-proof structure and the plane of the supporting tool, and processing a height limiting block with the height equal to the distance;
in said step (d), wiping the surface of the heat-resistant structure with alcohol to remove dirt;
brushing PR1200 primer on the bonding surface of the side wall bearing structure and the heat-proof structure, and airing for 0.5h at normal temperature;
winding first steel wires with the spacing of 50mm and 0.2mm on the surface of the side wall load-bearing structure, and winding second steel wires with the spacing of 0.1mm and 50mm along the circumferential direction of the parent direction on the inner surface of the heat-resistant structure;
the weight ratio of the component A RTV560 to the component B DBT is 100:0.5 preparing RTV560 glue solution, wherein the component B is calculated according to 0.022g per drop, and is added according to the drop, and fully and uniformly stirring;
coating RTV560 glue on the glue joint surface of the side wall bearing structure and the heat-proof structure according to the proportion of not less than 250g/m < 2 >, and taking out the steel wire;
placing a support tool with a side wall bearing structure on the surface of a base sleeved with a pressurizing tool, and placing a height limiting block on the flanging surface of the support tool;
enabling a first positioning through hole at the 3-position flange of the large end of the heat-proof structure to penetrate through a positioning pin at the 3-position of the surface of the supporting tool;
a layer of steel plate is arranged between a pressure head sleeved with a pressurizing tool and a heat-proof structure, a pressure sensor is arranged at the center of the steel plate and the pressure head, and two layers of fluorine cloth are padded between the pressure sensor and the pressure head;
pressurizing the small end flanging for 10kg, if the heat-proof structure does not drop in the pressurizing process, placing a pressure equalizing aluminum plate on the surface of the large end flanging until the heat-proof structure contacts with the height limiting block, so that the glue solution slowly flows out from one side of the large end, and then solidifying for 24 hours at room temperature;
and sending the packaged structure to physical and chemical detection, carrying out ultrasonic flaw detection on the glued joint surface, and giving a detection report.
2. The method of claim 1, wherein in step (a), fabricating the preform of the heat-resistant structure comprises molding, dip curing, and drying.
3. A method according to claim 2, wherein the forming of the female mould is performed, the fibre web is laid on the surface of the female mould, the web layers are connected by needling, and the preform is inspected after forming;
preparing resin impregnation glue solution, placing the preform in an impregnation tool, sealing, gradually impregnating the resin glue solution from the bottom of the preform to the top of the preform by vacuumizing, and baking the preform until the glue solution forms gel by using an oven;
and cleaning gel blocks around the preform, and drying the preform.
4. The method of claim 1, wherein in step (b), the profile processing of the preform comprises:
placing the small end of the preform on a table top of a machine tool upwards, and processing the end face of the small end;
placing the small end of the preform downwards on a table surface of a machine tool, and centering a conical axis reference by using a small end reference surface;
machining a large end face of the prefabricated body, and uniformly machining first positioning through holes with diameter of 20mm at 8 positions around the large end flanging according to an axis reference;
machining the inner molded surface of the preform according to an axis reference, wherein the machining size is 11mm, so that the half cone angle of the inner molded surface is 31 degrees, and the overall profile of the inner molded surface is 0.1mm;
when the inner molded surface of the prefabricated body is machined, rough milling is firstly carried out, 2mm allowance is reserved, then grinding is carried out by adopting a grinding wheel until the machining size is reached, and the cutting amount of each cutter is not more than 0.5mm;
turning over the preform, aligning the axis according to the circle center of the first positioning through hole, and processing the outer molded surface;
processing the upper flanging of the large end of the preform to form a heat-proof structure, and removing and cleaning the clamp;
and a positioning aluminum block is diagonally arranged on the first positioning through hole on the large turnup at the position 3.
5. The method of claim 1, wherein in the step (b), the supporting tool is machined based on two pin holes at the large end of the side wall bearing structure, and machining reference surfaces and quadrant marks are established on the upper and lower surfaces of the turning sides of the supporting tool.
6. The method of claim 5, wherein the flatness of the bottom surface of the flange of the support tooling is less than 0.1mm;
turning over the support tool, and processing two phi 5 positioning pin holes according to the alignment axis of the outer circle of the small end flanging, wherein the distance is 600+/-0.02 mm;
processing a second positioning through hole with the diameter of 4.5 at the position of 8 at the position of 600mm of the reference circle, and matching the second positioning through hole with the diameter of 5;
machining a quadrant hole of phi 20 at the 4 positions of the reference circle of phi 850, and performing quadrant marking on the surface of the tool;
machining a threaded through hole of M10 at 8 at the position of the reference circle phi 764;
and (3) processing the upper surfaces of the small end and the large end of the supporting tool, wherein the flatness is 0.05mm, and the distance between the upper end surface and the lower end surface is 98mm.
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