CN111703567A

CN111703567A - Sleeve and manufacturing method thereof

Info

Publication number: CN111703567A
Application number: CN202010587378.1A
Authority: CN
Inventors: 彭国辉; 李小军; 徐培; 周松官; 朱森虎; 薄晓莉; 翁晨涛
Original assignee: Comac Shanghai Aircraft Design & Research Institute; Commercial Aircraft Corp of China Ltd
Current assignee: Comac Shanghai Aircraft Design & Research Institute; Commercial Aircraft Corp of China Ltd
Priority date: 2020-06-24
Filing date: 2020-06-24
Publication date: 2020-09-25

Abstract

A sleeve (100), the sleeve (100) comprises a sleeve wall (110), the sleeve wall (110) encloses a sleeve inner space, sleeve openings (120) are opened on the sleeve wall (110) for communicating the sleeve inner space with the outside of the sleeve (100), the sleeve wall (110) comprises an inner layer (111), an outer layer (112) located radially outside the inner layer (111), and a honeycomb structure arranged between the inner layer (111) and the outer layer (112), the honeycomb structure comprises a plurality of honeycomb cells (113) and a plurality of cell walls (114), the plurality of honeycomb cells (113) are spaces separated from each other by the cell walls (114), and the cell walls (114) extend in a direction inclined to the radial direction between the inner layer (111) and the outer layer (112). The invention also relates to a method of manufacturing such a sleeve. The sleeve provided by the invention has the advantages that the structural rigidity is improved, the structural weight is greatly reduced, and the sealing property is enhanced.

Description

Sleeve and manufacturing method thereof

Technical Field

The invention belongs to the field of airplane structure design. In particular, the present invention relates to a sleeve and a method of manufacturing such a sleeve.

Background

Referring to fig. 7 and 8, the leading-edge slat of the aircraft is in fixed-axis rotation, and is supported on the leading-edge structure through the leading-edge sliding rail 10, and the retraction passage passes through the front beam body 20, so that the front beam body 20 must be matched with the sliding rail movement track to reserve a cabin-passing opening 21. On the slide rail retraction channel, a sleeve 100 must be designed to block a fuel tank sealing gap caused by the slide rail penetrating through the cabin.

The mature industrial forming mode of the large-depth blind cavity part is welding forming and investment casting.

If welding forming is used as a forming mode, a large number of welding seams are easy to form corrosion sources, and fuel oil leakage is caused.

If investment casting is used as the forming mode, in order to prevent deformation and cracks during investment casting and casting, the minimum wall thickness of the casting is selected according to the minimum wall thickness requirement of investment precision casting. The overall weight of the sleeve cannot be cast into complex shapes subject to the constraints of the technological capability of casting and forming. Reducing the structural weight can only be undertaken from the part thickness.

However, the reduction of the structural wall thickness leads to lower rigidity of the cantilever type sleeve, and the cantilever type sleeve is easy to shake and deform and collide with the slide rail. Therefore, the sleeve formed by casting has consistent integral wall thickness, and the sleeve with integral rigidity is over strong in integral structure under the design working condition of smaller external load, the design margin is close to 20 times, and a very obvious weight reduction space is provided.

In view of the foregoing, it is desirable to improve the sleeve 100, and particularly the sleeve wall thereof, to meet the demands placed upon the sleeve in actual production.

Disclosure of Invention

The invention aims to design a sliding rail sleeve with a metal structure, which has three requirements of rigidity, weight and cost.

To this end, the invention provides a sleeve comprising a sleeve wall which encloses a sleeve interior space, in which sleeve openings are provided for communicating the sleeve interior space with the exterior of the sleeve,

it is characterized in that the preparation method is characterized in that,

the sleeve wall includes an inner layer, an outer layer located radially outward of the inner layer, and a honeycomb structure disposed between the inner layer and the outer layer, the honeycomb structure including a plurality of honeycomb cells and a plurality of cell walls, the plurality of honeycomb cells being spaces separated from each other by cell walls, the cell walls extending in a direction oblique to the radial direction between the inner layer and the outer layer.

The sleeve provided by the invention avoids the restriction requirement of the manufacturing capability on a blind cavity type sleeve such as a sliding rail sleeve, greatly reduces the structural weight while improving the structural rigidity, and enhances the sealing property by additionally arranging a partition between an inner layer and an outer layer, thereby realizing the blind cavity oil tank boundary meeting the sealing integrity of wings.

In a preferred embodiment of the sleeve according to the invention, the honeycomb cells are rhomboidal in shape in a plane perpendicular to the radial direction.

The diamond shaped cells of the honeycomb are advantageous for increasing the structural rigidity of the sleeve while further reducing the structural weight of the sleeve.

A preferred embodiment of the sleeve according to the invention is wherein the sleeve is a sliding rail sleeve of an aircraft leading edge slat.

The sleeve with high rigidity, light weight and good sealing performance is particularly suitable for airplanes, and is particularly suitable for a sliding rail for accommodating leading edge slats of the airplanes.

A preferred embodiment of the sleeve according to the invention, wherein at least a part of the sleeve wall of the sleeve is curved.

In the case of curved sleeve walls, the welding and investment casting methods of the prior art are more difficult to apply or require the introduction of greater wall thickness and weight, and thus the sleeve construction of the present invention is particularly useful as a contoured sleeve with a curved surface to accommodate different requirements for sleeve shape.

A preferred embodiment of the sleeve according to the invention, wherein the sleeve extends in an arc in the length direction.

The sleeve extending along the arc is better able to adapt to the requirements of the movement of the aircraft leading-edge slat and places greater demands on manufacture, and therefore the sleeve structure of the invention is particularly suitable as a sleeve extending along the arc in the length direction to accommodate different requirements for the sleeve shape.

A preferred embodiment of the sleeve according to the invention, wherein a cross-sectional profile of the sleeve perpendicular to the length direction comprises a curve.

In order to maintain the uniformity of the distance between the inner and outer layers, the cell walls are also required to be curved accordingly, which puts higher demands on the manufacturing process, so that the sleeve structure of the invention is particularly suitable for sleeves comprising curves as a cross-sectional profile to accommodate different requirements for the sleeve shape.

A preferred embodiment of the sleeve according to the invention, wherein the arrangement density of the cell walls varies along the length of the sleeve.

Varying cell wall lay-out densities can minimize the weight of the sleeve wall while maintaining the stiffness requirements.

In a preferred embodiment of the sleeve according to the invention, a mounting flange is provided at the sleeve opening, and the cell walls are arranged with a density that increases from the mounting flange along the length of the sleeve.

Such a sleeve wall is particularly suitable for sleeve walls in the form of cantilever beams, in order to reduce the weight of the sleeve wall reasonably.

A preferred embodiment of the sleeve according to the invention, wherein the cross-section of each of said cells in a plane perpendicular to the length direction of said sleeve remains constant.

The honeycomb cells arranged in this way are simple in structure and complete in function, and are particularly favorable for

The invention also relates to a method of manufacturing a sleeve according to the preceding description,

it is characterized in that the preparation method is characterized in that,

the sleeve wall is formed by 3D printing.

The mode of using 3D printing to replace the investment casting or welding forming in the past can greatly reduce the structure weight. In addition, printing metal honeycombs within the structural sandwich can greatly enhance structural rigidity.

In conclusion, the sleeve disclosed by the invention optimizes the number and the positions of the cell walls of the honeycomb structure in the sleeve through reasonable rigidity analysis and layout, greatly reduces the structural weight under the condition of ensuring that the rigidity of the cantilever end meets the design requirement, saves the weight cost, optimizes the sealing property of the sleeve wall, and is particularly favorable for being used as a sliding rail sleeve of a leading edge slat of an airplane.

It is to be understood that both the foregoing general description and the following detailed description illustrate various embodiments and are intended to provide an overview or framework for understanding the nature and character of the claimed subject matter.

This document includes the accompanying drawings to provide a further understanding of various embodiments. The accompanying drawings are incorporated in and constitute a part of this specification. The drawings illustrate various embodiments described herein, and together with the description serve to explain the principles and operations of the claimed subject matter.

Drawings

Technical features of the present invention are hereinafter clearly described with reference to the above objects, and advantages thereof are apparent from the following detailed description with reference to the accompanying drawings, which illustrate by way of example preferred embodiments of the present invention, without limiting the scope of the invention.

In the drawings:

FIG. 1 is a schematic perspective view of a sleeve according to a preferred embodiment of the invention, with the outer layers of the sleeve walls removed to more clearly show the honeycomb structure;

FIG. 2 is a schematic perspective view from another angle of the sleeve shown in FIG. 1 according to a preferred embodiment of the invention, with the outer layers of the sleeve walls removed to more clearly show the honeycomb structure;

FIG. 3 is a perspective cross-sectional view of the sleeve shown in FIG. 1 according to a preferred embodiment of the invention, showing a honeycomb structure between the inner and outer layers of the sleeve wall;

FIG. 4 is a schematic perspective view of a sleeve according to another preferred embodiment of the invention with a portion of the outer layer of the sleeve wall being removed and another portion of the sleeve wall being perforated to more clearly show the honeycomb;

FIG. 5 is an enlarged view of FIG. 4 with a portion of the outer layer of the sleeve wall shown in a generally circular shape removed in accordance with the present invention;

FIG. 6 is an enlarged view of a portion of the sleeve wall shown in FIG. 4 having a generally circular shape and a portion perforated in accordance with the present invention;

FIG. 7 shows a schematic perspective view of a sleeve for a sliding track of an aircraft leading-edge slat, and shows the arrangement of the water drainage pipes; and

fig. 8 shows a schematic perspective cross-sectional view of the sleeve of the sliding track for an aircraft leading-edge slat shown in fig. 7.

List of reference numerals

10 front edge slide rail

20 front beam body

21 cabin-penetrating opening

30 drainage pipe

100 sleeve

110 sleeve wall

111 inner layer

112 outer layer

113 cellular lattice

114 cell wall

120 sleeve opening

121 mounting flange

130 drainage pipe interface

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings and described below.

While the invention will be described in conjunction with the exemplary embodiments, it will be understood that this description is not intended to limit the invention to those embodiments illustrated. On the contrary, the invention is intended to cover not only these exemplary embodiments, but also various alternatives, modifications, equivalents and other embodiments, which may be included within the spirit and scope of the invention.

For convenience in explanation and accurate definition of the technical solutions of the present invention, the terms "upper", "lower", "inner" and "outer" are used to describe features of the exemplary embodiments with reference to the positions of these features as shown in the drawings.

Exemplary embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Referring to fig. 1 and 4, a sleeve 100 according to a preferred embodiment of the present invention is shown.

The sleeve 100 includes a sleeve wall 110. The sleeve wall 110 encloses the interior space of the sleeve 100. This interior space may be used, for example, to accommodate a leading-edge slat of an aircraft, in which case the sleeve 100 is a sliding track sleeve of an aircraft leading-edge slat. In this case, the inner space may be a substantially arc-shaped cylinder, i.e., the sleeve 100 extends in an arc shape in a length direction. And the sleeve 100 may have a generally rectangular cross-section.

It will be appreciated by those skilled in the art that the interior space may take on various other shapes as desired, such as cylindrical, ellipsoidal, etc. Preferably, the sleeve wall 110 has a rounded outer profile, i.e. the cross-sectional profile of the sleeve 100 perpendicular to the length direction comprises a curve. Preferably, at least a portion of the sleeve wall 110 of the sleeve 100 is curved. As in the orientation of fig. 1, the upper and lower wall portions of the sleeve 100 are curved.

A sleeve opening 120 is opened in the sleeve wall 110 for communicating the inner space of the sleeve with the outside of the sleeve 100. Preferably, the opening 120 may be opened at one end of the sleeve 100 and have a shape of a cross-section of the sleeve 100 at that point. However, the opening 120 may have a specific shape according to actual requirements, such as a part of the cross-sectional shape at the end, i.e. smaller than the cross-sectional shape at the end. Further, the opening 120 may be opened at other positions where the sleeve 100 communicates with the outside, and the opening 120 may have other suitable shapes. In general, the opening 120 may be shaped the same or similar to the through-hatch opening 21 in the front beam body 20.

The sleeve wall 110 includes an inner layer 111, an outer layer 112 radially outward of the inner layer 111, and a honeycomb structure disposed between the inner layer 111 and the outer layer 112. It is noted that radial refers herein to a direction perpendicular to a tangent plane of the object surface in question at each point.

The sleeve wall 110 is preferably manufactured by means of 3D printing.

The material of sleeve wall 110 may comprise various composite and metallic materials or a combination of both as is common in the art. The composite material and the carbon fiber layup can also be molded. When a metal material is selected as the material of the sleeve wall 110, suitable structural rigidity and sealing properties can be obtained with a small volume and can be easily formed by means of 3D printing.

The honeycomb structure includes a plurality of cell cells 113 and a plurality of cell walls 114. The plurality of cells 113 are spaces separated from each other by cell walls 114.

In the preferred embodiment as shown in fig. 1-3, the plurality of cell walls 114 intersect each other such that the cells 113 are diamond shaped on a plane perpendicular to the radial direction. Each cell 113 is in the form of a flat column when each cell wall 114 extends radially between inner layer 111 and outer layer 112.

In the preferred embodiment shown in fig. 4-6, cell walls 114 extend in a direction oblique to the radial direction between inner layer 111 and outer layer 112. In a preferred embodiment, the cross-section of each cell 113 in a plane perpendicular to the length of the sleeve 100 may remain constant, i.e., each cell 113 has a generally straight or curved cylindrical shape. In other words, at cell walls 114, inner layer 111 and outer layer 112 are separated by at least one layer of cell walls 114.

In order to provide more separation between the inner layer 111 and the outer layer 112, a plurality of cell walls 114 inclined with respect to the radial direction may also be arranged therebetween.

In a more preferred embodiment, as more clearly shown in FIG. 6, a plurality of cell walls 114 that are inclined with respect to the radial direction alternately meet each other at the inner layer 111 and the outer layer 112 to fill the entire space between the inner layer 111 and the outer layer 112, thereby ensuring that the space between the inner layer 111 and the outer layer 112 is completely interrupted by the cell walls 114.

It is noted that although not shown in the drawings, a person skilled in the art can imagine that the embodiments shown in fig. 1-3 and the embodiments shown in fig. 4-6 can be combined with each other to arrive at further embodiments. Wherein the cell walls 114, in addition to intersecting at the inner and

outer layers

111, 112, can intersect one another between the inner and

outer layers

111, 112 and define shaped honeycomb cells 113.

In a preferred embodiment, the cell walls 114 are arranged at a varying density along the length of the sleeve 100. For example, a mounting flange (flange) 121 may be provided at the sleeve opening 120, and the arrangement density of the cell walls 114 may gradually increase from the mounting flange 121 along the length of the sleeve 100. Wherein the mounting flange 121 may be used to interface with the front beam body 20 at the through-hatch opening 21 as previously described.

Although the cell walls 114 are shown and described as being generally planar sheet-shaped, the cell walls 114 may be formed in other shapes, such as curved surfaces, as desired. In addition, some or all of the cell walls 114 may also include a relatively thick wall thickness, e.g., much greater than the distance between the inner layer 111 and the outer layer 112, as desired.

Preferably, referring to fig. 4 and 7 for example, the sleeve 100 may further include a drain interface 130. A drain interface 130 is provided at an end of the sleeve 100 preferably opposite the sleeve opening 120 for connection to a drain 30 (see fig. 7). The drain interface 130 may take the form of a threaded bore as shown in fig. 4. The drain pipe joint 130 may be used to drain water accumulated in the inner space of the sleeve 100, so the drain pipe joint 130 may be preferably disposed at a lower position of the sleeve 100.

While the preferred embodiments of the present invention have been described in detail above, it should be understood that aspects of the embodiments can be modified, if necessary, to employ aspects, features and concepts of the various patents, applications and publications to provide yet further embodiments.

These and other changes can be made to the embodiments in light of the above detailed description. In general, in the claims, the terms used should not be construed to be limited to the specific embodiments disclosed in the specification and the claims, but should be construed to include all possible embodiments along with the full scope of equivalents to which such claims are entitled.

Claims

1. A sleeve (100), the sleeve (100) comprising a sleeve wall (110), the sleeve wall (110) enclosing a sleeve interior space, a sleeve opening (120) being opened in the sleeve wall (110) for communicating the sleeve interior space with an exterior of the sleeve (100),

it is characterized in that the preparation method is characterized in that,

the sleeve wall (110) comprises an inner layer (111), an outer layer (112) located radially outside the inner layer (111), and a honeycomb structure disposed between the inner layer (111) and the outer layer (112), the honeycomb structure comprising a plurality of honeycomb cells (113) and a plurality of cell walls (114), the plurality of honeycomb cells (113) being spaces separated from each other by cell walls (114), the cell walls (114) extending in a direction oblique to the radial direction between the inner layer (111) and the outer layer (112).

2. The sleeve (100) of claim 1,

the honeycomb cells (113) are in the shape of a rhombus on a plane perpendicular to the radial direction.

3. The sleeve (100) of claim 1,

the sleeve (100) is a sliding track sleeve for an aircraft leading-edge slat.

4. The sleeve (100) of claim 1,

at least a portion of the sleeve wall (110) of the sleeve (100) is curved.

5. The sleeve (100) of claim 4,

the sleeve (100) extends in an arc shape in a length direction.

6. The sleeve (100) of claim 4,

the cross-sectional profile of the sleeve (100) perpendicular to the length direction comprises a curve.

7. The sleeve (100) of claim 1,

the cell walls (114) have a distribution density that varies along the length of the sleeve (100).

8. The sleeve (100) of claim 7,

the sleeve opening (120) is provided with a mounting flange (121), and the arrangement density of the cell walls (114) is gradually increased from the mounting flange (121) along the length direction of the sleeve (100).

9. The sleeve (100) of claim 7,

the cross-section of each cell (113) in a plane perpendicular to the length direction of the sleeve (100) remains constant.

10. A method of manufacturing a sleeve (100) according to any one of the preceding claims,

it is characterized in that the preparation method is characterized in that,

the sleeve wall (110) is formed by 3D printing.