CN113779711A - Chemical milling process-based outer duct casing - Google Patents
Chemical milling process-based outer duct casing Download PDFInfo
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- CN113779711A CN113779711A CN202110938807.XA CN202110938807A CN113779711A CN 113779711 A CN113779711 A CN 113779711A CN 202110938807 A CN202110938807 A CN 202110938807A CN 113779711 A CN113779711 A CN 113779711A
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- 238000003801 milling Methods 0.000 title claims abstract description 29
- 239000000126 substance Substances 0.000 title claims abstract description 26
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 80
- 239000003351 stiffener Substances 0.000 claims description 20
- 238000010586 diagram Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 abstract description 19
- 238000013461 design Methods 0.000 abstract description 8
- 238000003466 welding Methods 0.000 description 11
- 230000008569 process Effects 0.000 description 7
- 238000012545 processing Methods 0.000 description 5
- 238000011161 development Methods 0.000 description 4
- 230000018109 developmental process Effects 0.000 description 4
- 238000005242 forging Methods 0.000 description 4
- 238000003754 machining Methods 0.000 description 4
- 238000005553 drilling Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical group [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 229910001069 Ti alloy Inorganic materials 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 241000237942 Conidae Species 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/24—Casings; Casing parts, e.g. diaphragms, casing fastenings
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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- Engineering & Computer Science (AREA)
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- Theoretical Computer Science (AREA)
- Geometry (AREA)
- General Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Evolutionary Computation (AREA)
- Computer Hardware Design (AREA)
- Computational Mathematics (AREA)
- Mathematical Analysis (AREA)
- Mathematical Optimization (AREA)
- Pure & Applied Mathematics (AREA)
- Mechanical Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention provides an outer duct casing based on a chemical milling process, which comprises a front casing and a rear casing, wherein grid-shaped reinforcing ribs are arranged on the front casing and the rear casing, and grid units of the reinforcing ribs are triangular or quadrilateral in shape; the front casing is of a cone shell-shaped structure, and the rear casing is of a cylindrical structure. The method can effectively solve the drawing problem of the reinforcing ribs in the design stage, and ensures that the reinforcing ribs can be drawn on the conical surface to finish the design in a projection mode based on the finished product structure, thereby greatly reducing the design difficulty of the casing part.
Description
Technical Field
The invention relates to an outer duct casing based on a chemical milling process.
Background
The chemical milling process is a processing method which exposes the processed parts of metal materials such as aluminum alloy, titanium alloy, high-temperature alloy and the like to a chemical medium containing acid or alkali, corrosion inhibitor and other additives for corrosion, and achieves the expected structural shape and size after the metal matrix and the acid or alkali in the bath solution and other corrosive agents generate chemical reaction and are dissolved. Can be used for the manufacture of titanium alloy parts with complex contour shapes, which cannot be completed or has high manufacturing cost by the traditional process method. The special machining process has the advantages of no tool loss, no cutting stress and deformation, high machining efficiency and low machining cost. The chemical milling does not generate cutting stress, and can process parts with thin walls, complex shapes, easy deformation, large areas and the like. To the structure that there are more heavy groove or strengthening rib on the quick-witted casket surface, if adopt the digit control machine tool to mill processing, processing cycle is longer, occupies the digit control machine tool for a long time, is unfavorable for the improvement of whole mill machining efficiency, adopts the chemistry to mill the work load that the process reduced the digit control and mills the process, can shorten the processing cycle of part.
The outer ducted casing bears axial load, the inclusion requirement of blade loss is considered, reinforcing ribs (or called weight reduction grooves) are designed on the outer surface of the casing, the reinforcing rib structure can effectively prevent buckling instability, impact damage of blade loss can be limited in each reinforcing rib unit, and damage expansion is avoided.
The invention with the application number of CN201410802737.5 discloses a method for improving the rigidity of a casing through annular, spiral and other grid reinforcing ribs, and introduces the length, distance and total width of a reinforcing bottom edge calculated by the reinforcing width, the reinforcing height and the reinforcing angle of a cylindrical section.
Disclosure of Invention
In order to solve the technical problems, the invention provides the chemical milling process-based outer duct casing which can effectively solve the drawing problem of the reinforcing rib in the design stage.
The invention is realized by the following technical scheme.
The invention provides an outer duct casing based on a chemical milling process, which comprises a front casing and a rear casing, wherein grid-shaped reinforcing ribs are arranged on the front casing and the rear casing, and grid units of the reinforcing ribs are triangular or quadrilateral in shape; the front casing is of a cone shell-shaped structure, and the rear casing is of a cylindrical structure.
The front casing is divided into an upper part and a lower part which are respectively the upper part and the lower part of the front casing.
The grid unit shape of the reinforcing ribs on the front casing is a longitudinal triangle, and one side of each longitudinal triangular reinforcing rib is parallel to the axial direction.
The grid unit shape of the reinforcing ribs on the front casing is a longitudinal triangle, and one side of each longitudinal triangular reinforcing rib is circumferential.
The grid unit quantity of the reinforcing ribs on the front casing is as follows:
wherein, R4 'is the front casing radius at the back end of the stiffener grid, and R3' is the front casing radius at the front end of the stiffener grid.
The number of the longitudinal reinforcing ribs on the front casing, which are not parallel to the axial direction, is as follows:
wherein, R4 'is the front casing radius at the back end of the stiffener grid, and R3' is the front casing radius at the front end of the stiffener grid.
The grid-shaped reinforcing ribs draw a shape diagram in an unfolded state at first, and then the shape diagram is wound on the shell model in three-dimensional modeling software.
The number of the non-circumferential longitudinal reinforcing ribs on the front casing is as follows:
wherein, R4 'is the front casing radius at the back end of the stiffener grid, and R3' is the front casing radius at the front end of the stiffener grid.
The invention has the beneficial effects that: the problem of drawing the reinforcing ribs in the design stage can be effectively solved, and the fact that the reinforcing ribs are drawn on the conical surface and can be designed in a projection mode is guaranteed based on the finished product structure, so that the design difficulty of parts of the casing is greatly reduced.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of one embodiment of a stiffener on the front case of FIG. 1;
FIG. 3 is a schematic view of another embodiment of a stiffener on the front case of FIG. 1;
FIG. 4 is an enlarged schematic view at A in FIG. 1;
FIG. 5 is an enlarged schematic view at B of FIG. 1;
FIG. 6 is a schematic structural view of a mounting seat at the intersection of the reinforcement ribs in FIG. 1;
FIG. 7 is a schematic view of the welded sight glass seat of FIG. 1;
fig. 8 is a schematic view of the riveted mount of fig. 1.
In the figure: 1-front casing upper part, 2-front casing lower part, 3-rear casing, 4-observation window mounting base, 5-casing shell, 6-welding seam, 7-boss, 8-mounting base, 9-rivet, 10-thread screw sleeve and 11-spigot.
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.
Example 1
The outer duct casing based on the chemical milling process as shown in fig. 1 to 8 comprises a front casing and a rear casing 3, wherein grid-shaped reinforcing ribs are arranged on the front casing and the rear casing 3, and grid units of the reinforcing ribs are triangular or quadrilateral; the front casing is a cone shell structure, and the rear casing 3 is a cylinder structure.
Example 2
Based on embodiment 1, the front casing is divided into two parts, namely, a front casing upper part 1 and a front casing lower part 2.
Example 3
Based on the embodiment 1, the grid unit shape of the reinforcing ribs on the front casing is longitudinal triangle, and one side of the longitudinal triangle reinforcing ribs is parallel to the axial direction.
Example 4
Based on the embodiment 1, the grid unit shape of the reinforcing rib on the front casing is a longitudinal triangle, and one side of the longitudinal triangle reinforcing rib is a circumferential direction.
Example 5
Based on embodiment 1, and the number of grid cells of the reinforcing ribs on the front casing is as follows:
wherein, R4 'is the front casing radius at the back end of the stiffener grid, and R3' is the front casing radius at the front end of the stiffener grid.
Example 6
Based on embodiment 3, the number of the longitudinal reinforcing ribs on the front casing, which are not parallel to the axial direction, is as follows:
wherein, R4 'is the front casing radius at the back end of the stiffener grid, and R3' is the front casing radius at the front end of the stiffener grid.
Example 7
Based on example 1, and for the lattice-shaped reinforcing ribs, the shape diagram in the expanded state is drawn first, and thereafter the shape diagram is wrapped around the shell model in the three-dimensional modeling software.
Example 8
Based on embodiment 4, the number of the non-circumferential longitudinal reinforcing ribs on the front casing is as follows:
wherein, R4 'is the front casing radius at the back end of the stiffener grid, and R3' is the front casing radius at the front end of the stiffener grid.
Example 9
Based on the above embodiments, specifically, the outer duct casing is divided into an outer duct front casing and an outer duct rear casing, where the outer duct front casing is a tapered structure, and the tapered casing is often designed to be a split structure in consideration of its assembling property, and the rear casing is a full-cylinder structure.
The outer duct casing adopting the chemical milling process is visually characterized in that reinforcing ribs with different shapes are arranged on the surface, the conventional reinforcing ribs have triangular and quadrilateral shapes, and the triangular reinforcing ribs have transverse and longitudinal directions as shown in figures 2 and 3.
The enlarged views of the front end and the rear end of the conical section are respectively shown in fig. 4 and fig. 5, the radius of the outer edge of the small end of the conical section is R1, the radius of the outer edge of the large end of the conical section is R2, the axial length of the conical section is L, the distance from the initial position of the reinforcing rib to the axial direction of the small end of the conical section is L1, the distance from the final position of the reinforcing rib to the axial direction of the large end of the conical section is L2, the taper of the conical section is 2 alpha, the width W of the reinforcing rib on the middle longitudinal installation edge, the arc length W1 at the non-rib part of the small end, the arc length W2 at the non-rib part of the large end, the radius R3 at the initial position of the reinforcing rib of the small end, and the radius R4 at the final position of the reinforcing rib of the large end. Wherein W1 and W2 can be obtained by W calculation from differential chemical knowledge in mathematics.
The method for determining the parameters of the conical section longitudinal triangular reinforcing rib comprises the following steps:
s1: preliminarily determining the number N1 of units at the small end of the cone section, wherein the arc length L3 of each unit at the small end is 2 pi R3/N1;
s2: the number N3 of the large end units is consistent with the number N1 of the small end units, and the arc length L4 of each unit of the large end is 2 pi R4/N1;
s3: the oblique reinforcing ribs draw straight lines according to the initial angle of 60 degrees of the triangle, intersect with the large end fan shape of the conical section and are composed of
Getting the whole to obtain the cross-region part N4 of the reinforcing rib and the longitudinal reinforcing ribThe number of the units N2 is N4/2, when N4 is an even number, the longitudinal reinforcing rib units are integers, and when N4 is an odd number, the longitudinal reinforcing rib units are half in number;
s4: after the quantity of N1 and N2 is determined, drawing a reinforcing rib development figure, wherein the size of the development figure is calculated by a side development formula of the circular truncated cone, namely the radius R3 'of a small end of the fan is R3/sin alpha, the radius R4' of a large end of the fan is R4/sin alpha, and the angle of the fan is beta is 360sin alpha;
s5: the sectional point of the small end is obliquely connected to the sectional point of the large end according to the number of cross-sections N4 to form a reinforcing rib shape diagram;
in S5, the connecting line of the span region can be drawn as an arc line with curvature, the arc line on the unfolding plane needs to always form a fixed angle with the fan-shaped generatrix, the angle is determined by the number of the span regions, and the angle is 2 pi N4/N1. After the arc line drawn based on the drawing is wound according to the following step of S6, the generated spiral line has a more triangular spatial visual effect;
s6: after the reinforcing rib shape graph is drawn, winding the reinforcing rib shape graph on the conical shell based on modeling software;
s7: the three-dimensional reinforcing rib is established by utilizing the function of modeling software, the width and the height of the reinforcing rib can be preliminarily given during modeling, the determination of the width and the height is determined according to strength simulation, and meanwhile, the process feasibility is considered, the width is not too narrow, and the height is not too high.
In the method, the reinforcing rib units are distributed in a whole circle, if the position of no reinforcing rib on the middle longitudinal installation edge is considered, no reinforcing rib unit can be arranged, and the arc length L3' of the small end of each reinforcing rib unit is 2 pi R3-2W 1; the arc length L4' of the big end is R4(2 pi R3-2W1)/R3, and the shape of the reinforcing rib of the big end close to the middle longitudinal installation edge is different from other units because the longitudinal reinforcing rib is ensured to be along the tapered generatrix.
The method is based on the winding function of a planar reinforcing rib shape diagram in modeling software, and can also be used for modeling in a spiral line establishing mode after a conical section solid model is established, wherein the number of spiral coils in modeling parameters is N4/N1, the thread pitch is (L-L1-L2)/N2, and a regular curve is a generatrix of a conical surface.
The method for determining the triangular rib parameters for transverse triangular ribs is similar to the method described above, except that the number of rib cross-section parts N4 is calculated by the method wherein the number of longitudinal rib units N2 is 2N 4. The small end division number N1 of the conical surface and the segmentation points after the large end division number do not correspond to each other one by one along the generatrix direction. Because the transverse triangular reinforcing ribs are denser than the longitudinal triangular reinforcing ribs, the transverse triangular reinforcing ribs are less used after the weight reduction requirement is comprehensively considered.
The reinforcing rib determining method of the whole cylinder structure is similar to that of the conical section, and R1-R2, R3-R4 and W-0 in the parameters are included. The shape of the strengthening rib in the development drawing of the outer surface of the casing is formed by straight lines.
The method of determining the parameters of the rectangular reinforcing ribs is similar to that of the triangular reinforcing ribs.
The integral scheme of the outer duct casing can be that plates are welded with annular mounting edges and longitudinal mounting edges, preferably, an annular forging piece integral forming scheme is adopted, namely the mounting edges of the front and rear casings and the shell are integral annular forging pieces, and the horizontal mounting edges are of a welding structure. According to the design requirements of the outer duct casing, a maintenance, repair and test interface structure is designed, and structures such as a mounting seat, an observation window and a mounting edge are arranged by considering the mounting requirements of structural members such as external components, accessories and pipelines.
The mounting seat on the outer duct casing can be machined in a chemical milling integrated forming mode, and the integrated forming mounting seat is obtained through multiple times of chemical milling. Because the bracket for fixing the accessories and the guide pipe is arranged on the outer ducted casing, the mounting seat can be arranged at the intersection point position of the reinforcing rib or according to specific fixing requirements, as shown in fig. 6, the bracket mounting seat integrally formed on the outer ducted casing can be in a threaded hole structure, and the bracket is connected to the outer ducted casing mounting seat through a bolt.
The observation window seat can be integrally formed, welded and riveted on the outer duct casing through chemical milling. The integrated observation window seat is obtained by multiple times of chemical milling, a threaded hole for mounting is formed in the observation window seat, and the milling depth exceeds 10mm due to a chemical milling process, so that the shell thickness and the reinforcing rib height with higher tolerance level cannot be obtained.
The structure of the welding observation window seat is shown in fig. 7, and the alternative welding mode is argon arc welding, preferably vacuum electron beam welding, the observation window mounting seat 4 is directly welded on the casing shell 5 in a smooth transition mode, and a welding seam 6 is formed at the transition position.
For the observation window seat with higher height and larger opening diameter, the observation window seat can not be processed by a chemical milling integral forming method, besides a welding mode, the observation window seat can be connected to a casing by a riveting observation window mounting seat, the structure of the riveting mounting seat is shown in figure 8, the height of a matching boss 7 of the mounting position of the mounting seat 8 is lower, the mounting seat is a chemical milling integral forming structure, the matching position of the mounting seat 8 and a boss hole can be a structure with a spigot 11, the mounting seat is riveted and fastened by a rivet 9, and the mounting seat 8 is provided with a threaded hole or a threaded screw sleeve 10 for connecting a pipe joint and a plugging cover.
The outer duct casing is provided with an annular mounting edge for mounting the accessory and the guide pipe, the mounting edge can be integrally machined with the whole casing of the annular forging in a turning mode, can also be connected with the casing in a welding mode, and can also be riveted with the casing.
In order to realize the structural design scheme, a process scheme is established. The main process flow is as follows: turning a ring forging blank, coating glue, (laser) engraving, chemically milling, collecting a workpiece, drilling and milling a mounting seat hole of a casing of a machine box, assembling and welding the mounting seat in a positioning manner, welding the mounting seat, performing X-ray inspection, performing kerosene and chalk airtightness inspection, performing vacuum thermal correction, inspecting profile tolerance, performing semi-finish turning on a rear mounting edge, performing semi-finish turning on a front mounting edge, performing finish turning on the rear mounting edge, processing the rear mounting edge mounting hole, milling and drilling the end face of the mounting seat, milling and drilling a boss on the casing, performing finish turning on the front mounting edge, processing the front mounting edge mounting hole, and tapping threads.
Claims (8)
1. The utility model provides an outer duct machine casket based on chemistry mills technology, includes preceding machine casket and back machine casket (3), its characterized in that: the front casing and the rear casing (3) are provided with latticed reinforcing ribs, and the grid units of the reinforcing ribs are triangular or quadrangular; the front casing is of a cone shell-shaped structure, and the rear casing (3) is of a cylindrical structure.
2. The chemical milling process-based bypass casing according to claim 1, wherein: the front casing is divided into an upper part and a lower part which are respectively a front casing upper part (1) and a front casing lower part (2).
3. The chemical milling process-based bypass casing according to claim 1, wherein: the grid unit shape of the reinforcing ribs on the front casing is a longitudinal triangle, and one side of each longitudinal triangular reinforcing rib is parallel to the axial direction.
4. The chemical milling process-based bypass casing according to claim 1, wherein: the grid unit shape of the reinforcing ribs on the front casing is a longitudinal triangle, and one side of each longitudinal triangular reinforcing rib is circumferential.
5. The chemical milling process-based bypass casing according to claim 1, wherein: the grid unit quantity of the reinforcing ribs on the front casing is as follows:
wherein, R4 'is the front casing radius at the back end of the stiffener grid, and R3' is the front casing radius at the front end of the stiffener grid.
6. The chemical milling process-based bypass casing according to claim 3, wherein: the number of the longitudinal reinforcing ribs on the front casing, which are not parallel to the axial direction, is as follows:
wherein, R4 'is the front casing radius at the back end of the stiffener grid, and R3' is the front casing radius at the front end of the stiffener grid.
7. The chemical milling process-based bypass casing according to claim 1, wherein: the grid-shaped reinforcing ribs draw a shape diagram in an unfolded state at first, and then the shape diagram is wound on the shell model in three-dimensional modeling software.
8. The chemical milling process-based bypass casing according to claim 4, wherein: the number of the non-circumferential longitudinal reinforcing ribs on the front casing is as follows:
wherein, R4 'is the front casing radius at the back end of the stiffener grid, and R3' is the front casing radius at the front end of the stiffener grid.
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| CN202110938807.XA CN113779711A (en) | 2021-08-16 | 2021-08-16 | Chemical milling process-based outer duct casing |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110938807.XA CN113779711A (en) | 2021-08-16 | 2021-08-16 | Chemical milling process-based outer duct casing |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4801070A (en) * | 1987-05-11 | 1989-01-31 | Rohr Industries, Inc. | Engine duct and case construction |
| CN102954318A (en) * | 2012-11-08 | 2013-03-06 | 中国航空工业集团公司沈阳发动机设计研究所 | Novel reinforcing rib layout design method of thin-wall machine case |
| CN105483704A (en) * | 2015-11-23 | 2016-04-13 | 沈阳黎明航空发动机(集团)有限责任公司 | Deep chemical milling method of TA12 and TA15 titanium-alloy large-scale structural components |
| CN105756726A (en) * | 2014-12-19 | 2016-07-13 | 中国航空工业集团公司沈阳发动机设计研究所 | Method for improving case rigidity |
| CN206397601U (en) * | 2016-12-26 | 2017-08-11 | 中国航发商用航空发动机有限责任公司 | Fanjet bearing support cone and fanjet |
| CN111859483A (en) * | 2020-06-09 | 2020-10-30 | 大连理工大学 | Lightweight design method for armor type thin-wall structure |
-
2021
- 2021-08-16 CN CN202110938807.XA patent/CN113779711A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4801070A (en) * | 1987-05-11 | 1989-01-31 | Rohr Industries, Inc. | Engine duct and case construction |
| CN102954318A (en) * | 2012-11-08 | 2013-03-06 | 中国航空工业集团公司沈阳发动机设计研究所 | Novel reinforcing rib layout design method of thin-wall machine case |
| CN105756726A (en) * | 2014-12-19 | 2016-07-13 | 中国航空工业集团公司沈阳发动机设计研究所 | Method for improving case rigidity |
| CN105483704A (en) * | 2015-11-23 | 2016-04-13 | 沈阳黎明航空发动机(集团)有限责任公司 | Deep chemical milling method of TA12 and TA15 titanium-alloy large-scale structural components |
| CN206397601U (en) * | 2016-12-26 | 2017-08-11 | 中国航发商用航空发动机有限责任公司 | Fanjet bearing support cone and fanjet |
| CN111859483A (en) * | 2020-06-09 | 2020-10-30 | 大连理工大学 | Lightweight design method for armor type thin-wall structure |
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