EP0767509B1 - Verschleissanzeiger, insbesondere für thermoplastischen Radom und Verfahren zur Herstellung - Google Patents

Verschleissanzeiger, insbesondere für thermoplastischen Radom und Verfahren zur Herstellung Download PDF

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Publication number
EP0767509B1
EP0767509B1 EP19960402117 EP96402117A EP0767509B1 EP 0767509 B1 EP0767509 B1 EP 0767509B1 EP 19960402117 EP19960402117 EP 19960402117 EP 96402117 A EP96402117 A EP 96402117A EP 0767509 B1 EP0767509 B1 EP 0767509B1
Authority
EP
European Patent Office
Prior art keywords
radome
pellet
wear indicator
indicator according
wear
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.)
Expired - Lifetime
Application number
EP19960402117
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English (en)
French (fr)
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EP0767509A1 (de
Inventor
Charles Thomson-CSF SCPI Garnot
Serge Thomson-CSF SCPI Laforet
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thales SA
Original Assignee
Thomson CSF SA
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Filing date
Publication date
Application filed by Thomson CSF SA filed Critical Thomson CSF SA
Publication of EP0767509A1 publication Critical patent/EP0767509A1/de
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Publication of EP0767509B1 publication Critical patent/EP0767509B1/de
Anticipated expiration legal-status Critical
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome

Definitions

  • the present invention relates to a wear indicator, in particular for radome, and more specifically for radome thermosplastic injected. It also relates to a method of manufacture of a radome fitted with this erosion indicator.
  • a radome is a protective dome of an antenna. It is realized in a material compatible with the reception by the antenna of waves electromagnetic, the most commonly used material originally glass-epoxy, which is a thermosetting material.
  • thermosetting material with a material thermoplastic, more precisely that known under the name of PEEK ("Poly-Ether-Ether-Ketone”), shaped under high temperature and high pressure.
  • PEEK Poly-Ether-Ether-Ketone
  • thermoplastics Although their very good performance, these materials thermoplastics nevertheless undergo erosion due to the impact of raindrops, on which it is necessary that the user, or "aircraft manufacturer", has information constantly or periodically.
  • thermoplastic radomes There are currently two solutions for obtaining information to check the wear of these modern thermoplastic radomes.
  • a first solution very simple but in fact very impractical, consists in providing, locally on the radome, a surplus of material constituting a wear indicator. It is then necessary that this surplus of material is provided in an area where it does not disturb reception or the emission of radio waves, which limits the possibilities use.
  • this surplus of material is provided in an area where it does not disturb reception or the emission of radio waves, which limits the possibilities use.
  • the wear of this excess material is practically not detectable for an observer who is usually placed on the ground.
  • Another solution is to use a measuring device specially designed to measure this wear of the radome. It's about typically of a tubular bearing device which has just been placed coaxially on the top of the radome, on which it fits. An instrument measuring, acting by comparison, then measures the distance between a fixed point of the measuring device and the tip of the radome, this distance increasing as the wear of the radome increases.
  • the outer layer is made of material resistant to rain erosion, and it's a different color than the underlying layers, thus constituting an indicator of radome erosion.
  • this known method is practically inapplicable when the radomes are made by injection, especially because it is then difficult to achieve a colored external "layer" of constant thickness and precise, and that if such radomes were produced despite this, they would be complex to carry out and too expensive, because it would be necessary to use at least two different molds. In addition, there is no need to measure erosion where it does not may occur.
  • the present invention relates to an erosion indicator or wear, which is easy to make both for molded objects and for laminated objects and which gives an indication of wear or erosion well before the embrittlement of these objects.
  • the wear indicator of the invention for a part to be monitored is characterized in that it consists of at least one pastille, colored different from that of the material of which the part is made, which is integrated to the structure of the room, and which is positioned, in this room so that its part which has become visible due to the wear of the part gives a indication of the degree of wear.
  • this pellet has a conical shape arranged in such a way that its axis is perpendicular to the outer surface subject to wear, the tip of the cone being directed towards this surface.
  • this control patch is placed in the nose of the radome and coaxially with it.
  • this patch is produced in the same thermoplastic material than the radome, which has the advantage of not not change the erosion rate before and after wear indication.
  • the invention is described below with reference to a radome, but it is understood that it is not limited to such an application, and that it can be implemented in any application where a visual indication of the degree of wear or erosion of a part, in particular when you cannot see this degree of wear directly (edge of the part not visible, part difficult to access or hardly visible or requiring disassembly to be able to be measured).
  • the wear in question is that of a protective radome for airborne equipment, mainly due to rain erosion, but it is understood that the invention can be also used for parts subject to different others kinds of wear (in particular by friction).
  • This mold consists on the one hand of a male part 1 composed a base 2 surmounted by a nipple 3 of the same profile as that of the internal surface 4 of the radome 14 of FIG. 2, and the top of which is provided of a nipple 5 whose role will be specified below, and on the other hand of a part female conjugate 6 which defines an internal surface 7 of the same profile as the external surface 8 of the radome 14 of FIG. 2.
  • this female part 6 is conventionally provided with a axial injection “core” 9 which is a channel through which the components of the thermoplastic material is injected into the mold in the molten state, under strong pressure and high temperature.
  • thermoplastic material in this example preferential production is PEEK (Poly-Ether-Ether-Ketone).
  • the stud 5 and the cavity 11 by a temporary bonding of the patch to the male part 1.
  • the tablet 10 could be obtained by a method injection into a small mold provided for this purpose, instead of being carried out by machining.
  • the components of the PEEK constituting the radome of figure 2 are injected by the injection core 9.
  • the part external of the pellet 10 is then brought to a temperature sufficient to melt locally, so that this pellet is welded to the body 12 of the radome, composed of PEEK of another color, and therefore drown in somehow in this body 12 of the radome 14.
  • the radome 14 of FIG. 2 entirely made of PEEK and comprising, on the tip of its internal surface 4 and recessed with respect to the tip 13 of its external surface 8, a patch 10 of a color different from that which constitutes the remaining part of the radome 14.
  • the tablet 10 can be provided on its cylindrical surface of means holding it in place, for example ribs of revolution or equivalent devices (radial asperities, thread, ...) which prevent it from being ejected if it is badly welded to the body 12, when its front face is released due to erosion.
  • FIGS 3 to 5 illustrate the role of rain erosion indicator which is played by this patch 10.
  • the radome 14, mounted on its receiving base 15, is seen from the front.
  • the pellet When, following rain erosion, the thickness of the radome at its tip has decreased enough, the pellet begins to appear as drawn in Figure 4, that is to say in a granulated appearance, with dots the color of the patch, and dots of the color of the radome. This is due the fact that erosion due to raindrops is not carried out in such a way uniform, but in a particular way, each impact of a raindrop removing a small particle of matter.
  • pellets there may be several pellets, grouped in the same area or distributed over the entire surface external to monitor. These pastilles are then colored with colors different, and are of different lengths, which makes it possible to determine different degrees of wear. Of course, their coloring should not harm dielectric qualities of the radome.
  • FIG. 6 shows another embodiment of the tablet of the invention.
  • the radome 17 has at its front part a pellet 18 of conical shape.
  • the axis of this cone is perpendicular to the external surface of the radome and is, in this case, coincident with the axis radome, but it may not be confused in cases where it is not the apex of the radome which is the place subject to maximum erosion.
  • the tip of cone may be flush with the outer surface of the radome or be slightly withdrawal.
  • the color of the material constituting the pellet is different from that constituting the radome. Thanks to such a pellet, we know at all times the degree of wear of the radome, which is proportional to the visible surface of the patch.
  • the radome 19 may include several pellets, cylindrical or conical, arranged in the most subject to erosion. This figure shows three such pellets, referenced 20, 21 and 22.
  • pellets of the invention can also be used for a radome with a stratified structure.
  • the invention can also be implemented for parts other than radomes and subject to wear, when it is not possible directly determine their thickness.
  • the invention is not limited to the example preferential which has just been described.
  • This is how it is advantageous, in particular not to disturb the reception of electromagnetic waves, that the pad 10 is made of the same thermoplastic material as the body 12 of the radome, but this is not limiting and this pellet could very be provided in a thermoplastic material of another kind. It is thus also that this pellet could be kept in place in the mold by a suction process instead of being by mechanical means.
  • this same pellet could not be positioned in the nose of the radome 14, coaxially therewith, but being more or less offset from its axis, depending on the place of maximum impact raindrops.
  • the size is small enough not to influence unfavorably the homogeneity of the qualities of the parts containing it.

Landscapes

  • Injection Moulding Of Plastics Or The Like (AREA)
  • Details Of Aerials (AREA)

Claims (11)

  1. Verschleißanzeiger für ein zu überwachendes Bauteil (14), dadurch gekennzeichnet, daß er aus mindestens einem Klötzchen (10) einer anderen Farbe als die des Materials des Bauteils besteht und in die Struktur dieses Bauteils integriert sowie derart in diesem Bauteil positioniert ist, daß der aufgrund des Verschleißes des Bauteils sichtbar werdende Bereich des Klötzchens eine Anzeige für den Verschleißgrad bietet.
  2. Verschleißanzeiger nach Anspruch 1, dadurch gekennzeichnet, daß das Klötzchen eine zylindrische Form besitzt.
  3. Verschleißanzeiger nach Anspruch 2, dadurch gekennzeichnet, daß das Klötzchen auf seiner zylindrischen Oberfläche Verankerungsmittel aufweist.
  4. Verschleißanzeiger nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß er mehrere Klötzchen unterschiedlicher Länge und Farbe aufweist.
  5. Verschleißanzeiger nach Anspruch 1, dadurch gekennzeichnet, daß das Klötzchen eine konische Form besitzt.
  6. Verschleißanzeiger nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß das zu überwachende Bauteil ein Radom ist.
  7. Verschleißanzeiger nach Anspruch 6, dadurch gekennzeichnet, daß das Radom aus thermoplastischem Material ist.
  8. Verschleißanzeiger nach Anspruch 6 oder 7, dadurch gekennzeichnet, daß das Klötzchen (10) im Scheitelpunkt des Radoms (14) und koaxial hierzu angeordnet ist.
  9. Verschleißanzeiger nach einem der Ansprüche 6 bis 8, dadurch gekennzeichnet, daß das Klötzchen (10) aus demselben thermoplastischen Materials wie das Radom (14) ist.
  10. Verschleißanzeiger nach einem der Ansprüche 6 bis 9, dadurch gekennzeichnet, daß das Klötzchen (10) auf der Innenseite (4) des Radoms eine Vertiefung (11) besitzt, die zu einem Nippel (5) zum Verankern des Klötzchens (10) komplementär ist, der am Kernteil (1) der Spritzgußform für das Radom vorgesehen ist.
  11. Verfahren zur Herstellung eines thermoplastischen Radoms mit einem Verschleißanzeiger nach einem der Ansprüche 6 bis 10, dadurch gekennzeichnet, daß es folgende Schritte aufweist:
    Zuerst wird ein thermoplastisches Klötzchen (10) einer anderen Farbe als der des Körpers (12) des Radoms und einer geringeren Dicke als der dieses Körpers hergestellt;
    dieses Klötzchen (10) wird dann auf den Kernteil (1, 3) der Spritzgußform für das Radom an der Stelle entsprechend seiner späteren Lage im Körper (12) des Radoms angebracht;
    nach dem Verschließen der Form wird das thermoplastische Material in diese eingespritzt, wobei sich das Klötzchen durch Anschmelzen mit dem Körper (12) des Radoms vollständig verbindet.
EP19960402117 1995-10-06 1996-10-04 Verschleissanzeiger, insbesondere für thermoplastischen Radom und Verfahren zur Herstellung Expired - Lifetime EP0767509B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9511794 1995-10-06
FR9511794A FR2739725B1 (fr) 1995-10-06 1995-10-06 Indicateur d'erosion pour radome thermoplastique et procede de fabrication

Publications (2)

Publication Number Publication Date
EP0767509A1 EP0767509A1 (de) 1997-04-09
EP0767509B1 true EP0767509B1 (de) 2001-07-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19960402117 Expired - Lifetime EP0767509B1 (de) 1995-10-06 1996-10-04 Verschleissanzeiger, insbesondere für thermoplastischen Radom und Verfahren zur Herstellung

Country Status (3)

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EP (1) EP0767509B1 (de)
DE (1) DE69614061T2 (de)
FR (1) FR2739725B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
MY140084A (en) * 2002-08-22 2009-11-30 Gates Unitta Asia Co Transmission belt and indication apparatus for indicating the end of life of transmission belt
CN113659330B (zh) * 2021-08-06 2023-08-15 苏州市新胜佳科技有限公司 一种5g基站耐老化天线罩及其成型工艺方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4615859A (en) * 1981-05-13 1986-10-07 Rogers Corporation Method of manufacture of improved radome structure
DE3410503A1 (de) * 1984-03-22 1986-01-02 Dornier System Gmbh, 7990 Friedrichshafen Verfahren zur herstellung von radomen
US4614466A (en) * 1984-06-01 1986-09-30 The United States Of America As Represented By The Secretary Of The Air Force Damaged radar radome repair device
GB2254489B (en) * 1984-08-21 1993-03-24 Era Patents Ltd Radome nose cap
JPH0633690A (ja) * 1992-07-17 1994-02-08 Kawasaki Steel Corp 推進鋼管の塗覆装損傷検知方法
US5371505A (en) * 1993-04-22 1994-12-06 Microwave Power Devices, Inc. Radome test systems and methods

Also Published As

Publication number Publication date
EP0767509A1 (de) 1997-04-09
FR2739725A1 (fr) 1997-04-11
DE69614061D1 (de) 2001-08-30
FR2739725B1 (fr) 1997-11-07
DE69614061T2 (de) 2001-11-29

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