GB2098926A - Honeycomb core with internal septum - Google Patents
Honeycomb core with internal septum Download PDFInfo
- Publication number
- GB2098926A GB2098926A GB8115959A GB8115959A GB2098926A GB 2098926 A GB2098926 A GB 2098926A GB 8115959 A GB8115959 A GB 8115959A GB 8115959 A GB8115959 A GB 8115959A GB 2098926 A GB2098926 A GB 2098926A
- Authority
- GB
- United Kingdom
- Prior art keywords
- honeycomb
- bath
- making
- material layer
- cut
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
- B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
- B32B3/12—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material characterised by a layer of regularly- arranged cells, e.g. a honeycomb structure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D24/00—Producing articles with hollow walls
- B29D24/002—Producing articles with hollow walls formed with structures, e.g. cores placed between two plates or sheets, e.g. partially filled
- B29D24/005—Producing articles with hollow walls formed with structures, e.g. cores placed between two plates or sheets, e.g. partially filled the structure having joined ribs, e.g. honeycomb
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/10—Inorganic fibres
- B32B2262/101—Glass fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/10—Inorganic fibres
- B32B2262/106—Carbon fibres, e.g. graphite fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/14—Mixture of at least two fibres made of different materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2305/00—Condition, form or state of the layers or laminate
- B32B2305/08—Reinforcements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/10—Properties of the layers or laminate having particular acoustical properties
- B32B2307/102—Insulating
Abstract
A method of forming a septum within a honeycomb structure consists of placing a material layer 15 upon a resilient layer 16, placing a honeycomb structure 18 upon the material layer 17 and applying pressure such that the honeycomb structure cuts through the material layer and the cut portion remains trapped within the structure. The structure is subsequently transferred to a bath of mercury such that the cut material portions are displaced by the mercury to a desired location within the honeycomb and subsequently bonded in place. <IMAGE>
Description
SPECIFICATION
Honeycomb core with internal septum
This invention relates to a method of making a honeycomb core with an internal septum. More particularly but not exclusively the honeycomb core may be used for a sound absorbent structure within a gas turbine engine.
In the past such types of honeycomb structures for use in gas turbine engines have usually been constructed musing a double layer of honeycomb core with a septum bonded between the two layers. Facing material is then bonded on both sides of the double layer forming a core sandwich.
However with this type of construction it is impossible to align the individual honeycomb cells of adjacent layers, and furthermore the necessary bond lines securing the respective parts together seriously reduce the overall strength of the structure. There have also been several other ways of manufacturing such structures however all have suffered either structural disadvantages or alternatively have been labour intensive in their manufacture.
An object of the present invention is to provide a honeycomb core with an internal septum which satisfactorily overcomes the aforementioned problems and disadvantages.
According to the present invention a method of making a honeycomb structure each cell of which includes a septum comprises, providing a resilient member upon which is located a material layer, placing the honeycomb upon the material layer, and applying pressure to the honeycomb such that it cuts through the material layer and traps the cut portions of the material within the honeycomb cells, removing the honeycomb material from the resilient member and subsequently placing it within a bath of relatively dense liquid which serves to locate the cut material portions at a desired location within the honeycomb cells and subsequently bonding the cut material portions forming the septums into place.
Preferably the material layer comprises a sheet of uncured fibre reinforced resin.
Furthermore the fibre reinforcing the resin sheet may consist of either glass fibre, carbon fibre or alumino-silicate fibre.
Preferably the dense liquid comprises a bath of mercury.
Furthermore a layer of solvent and resin may be floated upon the bath of dense liquid such that when the portions of cut material forming the septums are located by the liquid in their respective locations they are bonded into place by the resin, when the solvent is evaporated after removal of the structure from the bath.
It is envisaged that this invention also encompasses the use of such a honeycomb material including a septum for use as a sound absorbent liner in a gas turbine engine.
For better understanding thereof an embodiment of the invention will now be more particularly described by way of example only and with reference to the accompanying drawings in which: Figure 1 shows a pictorial side view of a ducted fan gas turbine engine having a broken away casing showing a diagrammatic cross-sectional view of a portion of honeycomb material made in
accordance with the present invention.
Figures 2 and 3 show a cross-sectional view of the honeycomb material during its manufacturing stages.
Figure 4 shows a pictorial view of the
completed honeycomb and septum.
Referring to the drawings a gas turbine engine shown generally at 10 includes a rotatably mounted fan 12 located within an annular fan duct 13 the radially innermost wall surface of which includes a layer of honeycomb material 14 arranged immediately adjacent the radially outermost blade tips of the fan 12 to act as a sound absorbent liner.
The basic honeycomb material shown in this invention may be manufactured from either metal or alternatively plastic or a fibre-reinforced plastic material. Such basic honeycomb may be produced by any of the well known manufacturing methods such as for example by being fabricated from a number of crimped strips which are bonded or welded together to form the honeycomb.
Figures 2 and 3 show cross-sectional views of the steps necessary to secure the septum within the individual cells of the honeycomb material. As illustrated at Figure 2 a resilient sheet 1 5 which may be rubber is laid upon a press platform 16. A material layer 17 which ultimately forms the septum is laid upon the resilient sheet 1 5. The material layer may consist of a glass or carbon or alumino-silicate fibre reinforced resin material, which fibre may be of the discontinuous type in the form of a felt or alternatively be of the laid up directionally orientated type. Alternatively the material layer 1 7 may consist of a metallic sheet.
The honeycomb material 18 is subsequently placed upon the material layer 1 7 and pressure is applied to it by means of the press head 1 9 sufficiently to enable the honeycomb material to cut through the material layer 17, the resilient layer serving to press the cut material layer into the individual honeycomb cells such that they remain trapped therein.
The honeycomb material is then removed from the resilient layer 1 5 and transferred to a bath 20 containing a relatively dense liquid such as for example mercury. The depth of the mercury within the bath 20 is carefully controlled such that when the honeycomb material is placed within it the piece of cut material forming the septums are displaced by the material to desired locations within the honeycomb cells. Alternatively the depth of mercury need not be controlled if the honeycomb material is secured within a gauge or jig to control the depth to which the honeycomb is inserted into the mercury.
To facilitate bonding of the pieces of the material layer 17 forming the septum within the honeycomb a quantity of resin in a suitable solvent may be floated upon the mercury bed such that the cut pieces of material and honeycomb become wetted with the resin and solvent. The solvent may subsequently be evaporated off and the resin cured to form the necessary bond, thus completing the formation of the septum. An additional benefit obtained by using a mercury bath is that the miniscus shape formed by the mercury forms a thickened resin portion at the septum honeycomb junctions.
It will be appreciated that by use of this invention it is possible to manufacture a honeycomb material including more than one septum if this is desired by merely repeating the operation.
Although the particular described embodiment of this invention is particularly directed to a sound absorbent liner for use in the fan duct of a gas turbine engine it is not intended that the honeycomb structure should be restricted to such an application. Such a material may be used for many applications both in the aero-space field and elsewhere where a honeycomb structure including at least one septum can be used advantageously.
Claims (8)
1. A method of making a honeycomb structure each cell of which includes a septum comprises, providing a resilient member upon which is located a material layer, placing the honeycomb upon the material layer, and applying pressure to the honeycomb such that it cuts through the material layer and traps the cut portions of the material within the honeycomb cells, removing the honeycomb material from the resilient member and subsequently placing it within a bath of relatively dense liquid which serves to locate the cut portions at a desired location within the honeycomb cells, and subsequently bonding the cut material portions forming the septums into place.
2. A method of making a honeycomb material as claimed in claim 1 in which the material layer comprises a sheet of uncured fibre reinforced resin.
3. A method of making a honeycomb material as claimed in claim 2 in which the fibre reinforcing the resin sheet consists of either glass, carbon or alumino-silicate fibre.
4. A method of making a honeycomb material as claimed in claim 1 in which the relatively dense liquid consists of a bath of mercury.
5. A method of making a honeycomb material as claimed in claims 1 and 4 in which a layer of solvent and resin is floated upon the bath of dense liquid such that when the portions of the cut material forming the septums are located by the liquid in their respective locations they are bonded into place by the resin when the solvent is evaporated after removal of the structure from the bath.
6. A honeycomb material the cells of which included septums as claimed in any of claims 1 to 5.
7. A honeycomb material as claimed in claims 1 to 6 suitable for use as a sound absorbent liner in a gas turbine engine.
8. A honeycomb structure as claimed in any preceding claim and substantially as hereinbefore described by way of example only and with reference to the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8115959A GB2098926A (en) | 1981-05-26 | 1981-05-26 | Honeycomb core with internal septum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8115959A GB2098926A (en) | 1981-05-26 | 1981-05-26 | Honeycomb core with internal septum |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2098926A true GB2098926A (en) | 1982-12-01 |
Family
ID=10522035
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8115959A Withdrawn GB2098926A (en) | 1981-05-26 | 1981-05-26 | Honeycomb core with internal septum |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2098926A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2252076A (en) * | 1991-01-22 | 1992-07-29 | Short Brothers Plc | Noise attenuation panel |
| US6536556B2 (en) | 2000-10-31 | 2003-03-25 | Airbus France | Noise reduction sandwich panel, notably for aircraft turbojet engine |
| WO2006107533A3 (en) * | 2005-04-04 | 2007-05-31 | Hexcel Corp | Acoustic septum cap honeycomb |
| WO2013036391A3 (en) * | 2011-09-08 | 2013-09-26 | Hexcel Corporation | Anchoring of septums in acoustic honeycomb |
| CN114348241A (en) * | 2020-10-14 | 2022-04-15 | 保时捷股份公司 | Ducted propeller of aircraft, aircraft and component of aircraft |
-
1981
- 1981-05-26 GB GB8115959A patent/GB2098926A/en not_active Withdrawn
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2252076A (en) * | 1991-01-22 | 1992-07-29 | Short Brothers Plc | Noise attenuation panel |
| GB2252076B (en) * | 1991-01-22 | 1994-11-09 | Short Brothers Plc | Noise attenuation panel |
| US6536556B2 (en) | 2000-10-31 | 2003-03-25 | Airbus France | Noise reduction sandwich panel, notably for aircraft turbojet engine |
| WO2006107533A3 (en) * | 2005-04-04 | 2007-05-31 | Hexcel Corp | Acoustic septum cap honeycomb |
| US7434659B2 (en) | 2005-04-04 | 2008-10-14 | Hexcel Corporation | Acoustic septum cap honeycomb |
| WO2013036391A3 (en) * | 2011-09-08 | 2013-09-26 | Hexcel Corporation | Anchoring of septums in acoustic honeycomb |
| US8607924B2 (en) | 2011-09-08 | 2013-12-17 | Hexcel Corporation | Anchoring of septums in acoustic honeycomb |
| US9016430B2 (en) | 2011-09-08 | 2015-04-28 | Hexcel Corporation | Anchoring of septums in acoustic honeycomb |
| CN114348241A (en) * | 2020-10-14 | 2022-04-15 | 保时捷股份公司 | Ducted propeller of aircraft, aircraft and component of aircraft |
| CN114348241B (en) * | 2020-10-14 | 2023-11-14 | 保时捷股份公司 | Ducted propeller of aircraft, aircraft and component of aircraft |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |