[go: up one dir, main page]

EP0243399B1 - Procede d'emboutissage de precision et assemblage a element helicoidal embouti - Google Patents

Procede d'emboutissage de precision et assemblage a element helicoidal embouti Download PDF

Info

Publication number
EP0243399B1
EP0243399B1 EP19860906073 EP86906073A EP0243399B1 EP 0243399 B1 EP0243399 B1 EP 0243399B1 EP 19860906073 EP19860906073 EP 19860906073 EP 86906073 A EP86906073 A EP 86906073A EP 0243399 B1 EP0243399 B1 EP 0243399B1
Authority
EP
European Patent Office
Prior art keywords
barrel
wave structure
support rods
slow
rods
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
Application number
EP19860906073
Other languages
German (de)
English (en)
Other versions
EP0243399A1 (fr
Inventor
George M. Lee
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.)
Raytheon Co
Original Assignee
Hughes Aircraft Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hughes Aircraft Co filed Critical Hughes Aircraft Co
Publication of EP0243399A1 publication Critical patent/EP0243399A1/fr
Application granted granted Critical
Publication of EP0243399B1 publication Critical patent/EP0243399B1/fr
Expired legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
    • H01J23/16—Circuit elements, having distributed capacitance and inductance, structurally associated with the tube and interacting with the discharge
    • H01J23/24—Slow-wave structures, e.g. delay systems
    • H01J23/26—Helical slow-wave structures; Adjustment therefor

Definitions

  • This invention is directed to a precision coining method particularly useful in coining the slow-wave structure of a traveling-wave tube and to the resulting coined helix assembly.
  • a stream of electrons in an electron beam is caused to interact with a propagating electromagnetic wave in a manner which amplifies the electromagnetic wave energy.
  • the electromagnetic wave is propagated along a slow-wave structure, such as an electrically conductive helix wound around the path of the electron beam.
  • the slow-wave structure provides a path of propagation for the magnetic wave which is considerably longer than the axial length of the structure so that the traveling wave may be made to effectively propagate at nearly the velocity of the stream of electrons in the electron beam.
  • Slow-wave structures of the helix type are usually supported within an encasing barrel by means of a plurality of (usually three) equally circumferentially spaced electrically insulating rods positioned around the helix and within the barrel.
  • the metallic barrel has an initial inside diameter which is smaller than the circumscribing circle around the support rods so that, if assembled with those dimensions, there would be an interference fit.
  • the barrel is heated and it is made of a material, such as copper, which expands upon heating.
  • an inside diameter is reached which is sufficiently large to receive the helix with its support rods, the helix and its support rods are inserted therein.
  • the barrel reduces in size to embrace the helix with its support rods in an interference fit.
  • Helical slow-wave structure 10 is shown in Figures 1, 2 and 3.
  • the slow-wave structure is made of a rectangular metal ribbon, usually tungsten, wound into a helix to define an interior passage through which the electron beam passes.
  • the passage for the electron beam is of circular section.
  • the external surface of the helix 10 is also of circular section.
  • the helix is straight.
  • the support rods are made of dielectric material, and beryllium oxide ceramic material is preferred.
  • the support rods are in the forms of right circular solid cylinders. The support rods lie around slow-wave structure 10 to be spaced at equal angles.
  • the support rods 12,14 and 16 are spaced 120 degrees apart around the axis through the center of the slow-wave structure.
  • the support rods are attached to the slow-wave structure by means of dielectric glue.
  • the glue is illustrated in Figure 2 where glue spot 18 is specifically identified as attaching support rod 12 to slow-wave structure 10.
  • the support rods are glued to the slow-wave structure in a fixture so as to create a a subassembly which is sufficiently strong for handling. Methyl methacrylate is preferred as the glue material.
  • Barrel 20 is a metallic tube in the form of a right circular cylindrical tube. It is made of malleable metal, such as oxygen-free high conductivity copper.
  • the barrel 20 has an initial outside diameter of 2.738 mm (0.1078 inch) and an initial inside diameter of its inner cylindrical surface 22 of 1.778 mm (0.0700 inch).
  • the circumscribing circle around the support rods 12,14 and 16 provides a diametrical clearance within the barrel of 0.0178 mm (0.0007 inch) so that the circumscribing circle is 1.760 mm (0.0693 inch). While both the subassembly and the barrel are at room temperature, the subassembly is inserted into the barrel. This step is shown in Figure 1.
  • FIG. 2 shows upper and lower dies 24 and 26 which respectively have upper and lower cavities 28 and 30 facing each other.
  • the cavities 28 and 30 form a right circular cylinder when the dies are closed together, with the parting line lying on the axis of the cylinder.
  • the diameter of the cavity, when closed, is 2.718 mm (0.1070 inch).
  • the subassembly and barrel are placed in the open die and the die is closed.
  • the closing of the die coins and malleably deforms the barrel around the subassembly to squeeze the barrel around the subassembly.
  • the squeezing of the barrel closes down the ceramic rods, which have a high modulus, and this positioning resiliently deforms the metallic helix 10.
  • the distortion is over- shown in Figure 3 for emphasis.
  • the resiliency of the metallic helix 10 maintains the stress over normal temperature cycling.
  • the outside diameter of the barrel is 2.718 mm (0.1070 inch) to 2.720 mm (0.1071 inch).
  • Figure 3 is a view of the completed assembly.
  • the completed assembly of Figure 3 is flushed with hot acetone to remove the methyl methacrylate glue. Thereupon, the assembly is placed into the traveling-wave tube.
  • the large contact area between the support rods and the barrel is necessary for proper heat transfer out away from the slow-wave structure.
  • the stressed electromagnetic provides force on the rods to maintain the helical slow-wave structure in place, upon its proper axis.
  • the plastically deformed copper barrel provides precision placement of the slow-wave structure and proper compression of the support rods onto the helix of the slow-wave structure so that the compressed helix maintains the return force over temperature cycling. The process is fast and accurate so that increased yield is achieved. in addition, the small sizes are now producible with accuracy.
  • the compression of the barrel and the slow-wave structure with its supporting rods therein is controlled by employing dies having the desired cavity diameter, in accordance with the size of the parts. An adequate length can be readily achieved.
  • the sizes given are to provide a specific example of the process and article. Other sizes and shapes can be produced by employing different starting parts and dies. Such are within the scope of this invention.

Landscapes

  • Microwave Tubes (AREA)
  • Forging (AREA)

Abstract

Une structure hélicoïdale (10) pour ondes lentes comportant trois tiges céramiques de support (12, 14, 16) est introduite avec un jeu dans l'alésage (22) d'un cylindre malléable (20). Des matrices (24, 26) se referment autour du cylindre pour l'emboutir en le déformant et le serrer autour des tiges de support de manière à les bloquer par un ajustement serré afin de supporter avec précision l'élément hélicoïdal (10) et en exploiter la conductivité thermique.

Claims (7)

1. Procédé de fixation d'une structure à ondes lentes dans le corps d'un tube à ondes progressives, comprenant les étapes qui consistent:
à monter une structure hélicoïdale (10) à ondes lentes entre au moins trois barreaux (12,14,16) de support ayant une dimension circulaire circonscrivante,
à placer la structure hélicoïdale à ondes lentes avec ses barreaux de support dans un corps tubulaire (20) ayant un diamètre intérieur plus grand que le diamètre de ladite dimension circulaire circonscrivante;
à insérer le corps tubulaire dans une matrice (24, 26) présentant des faces opposées (28, 30) qui, lorsque la matrice est fermée, définissent un cylindre circulaire droit d'un diamètre légèrement inférieur au diamètre extérieur initial du corps; et
à fermer la matrice pour estamper directement le corps autour des barreaux de support afin que la dimension intérieure du corps soit réduite à un diamètre inférieur à celui de ladite dimension circulaire circonscrivante pour entrer en contact avec les barreaux de support qui, par suite, compriment et déforment élastiquement la structure hélicoïdale comprimée à ondes lentes afin que la structure hélicoïdale à ondes lentes maintienne une force de rappel sur les barreaux pour maintenir fermement la structure hélicoïdale à ondes lentes et les barreaux de support à l'intérieur du corps.
2. Procédé selon la revendication 1, comprenant l'étape préliminaire qui consiste:
à attacher les barreaux à la structure hélicoïdale à ondes lentes au moyen d'un collage avant l'insertion de la structure hélicoïdale à ondes lentes et des barreaux dans le corps.
3. Procédé selon la revendication 2, comprenant en outre, après l'étape d'estampage, l'étape qui consiste:
à enlever la colle d'entre la structure hélicoïdale à ondes lentes et les barreaux.
4. Ensemble à hélice estampé pour le tube à ondes progressives fabriqué conformément au procédé selon l'une quelconque des revendications précédentes.
5. Ensemble selon la revendication 4, dans lequel la structure hélicoïdale à ondes lentes est en tungstène.
6. Ensemble selon la revendication 5, dans lequel les barreaux de support sont en matière céramique.
7. Ensemble selon la revendication 6, dans lequel le corps est principalement en cuivre.
EP19860906073 1985-10-21 1986-09-15 Procede d'emboutissage de precision et assemblage a element helicoidal embouti Expired EP0243399B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US78988285A 1985-10-21 1985-10-21
US789882 1985-10-21

Publications (2)

Publication Number Publication Date
EP0243399A1 EP0243399A1 (fr) 1987-11-04
EP0243399B1 true EP0243399B1 (fr) 1989-10-18

Family

ID=25148964

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860906073 Expired EP0243399B1 (fr) 1985-10-21 1986-09-15 Procede d'emboutissage de precision et assemblage a element helicoidal embouti

Country Status (4)

Country Link
EP (1) EP0243399B1 (fr)
JP (1) JPS63501182A (fr)
DE (1) DE3666522D1 (fr)
WO (1) WO1987002507A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102501032A (zh) * 2011-12-02 2012-06-20 安徽华东光电技术研究所 一种行波管电子枪系统定位弹片的制作工艺

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4712293A (en) * 1986-11-28 1987-12-15 Hughes Aircraft Company Method for securing a slow-wave structure in enveloping structure with crimped spacers

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3271615A (en) * 1961-08-23 1966-09-06 Westinghouse Electric Corp Traveling wave electron discharge device having means exerting a radial force upon the envelope
US3132410A (en) * 1962-03-08 1964-05-12 Cohen Aaron Methods of constructing a traveling wave tube
US3208126A (en) * 1962-05-14 1965-09-28 Sperry Rand Corp Method for making traveling wave tubes
GB984607A (en) * 1962-07-19 1965-02-24 Ferranti Ltd Improvements relating to travelling-wave tubes
US3808677A (en) * 1972-10-10 1974-05-07 Varian Associates Method of fabricating a traveling wave tube

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102501032A (zh) * 2011-12-02 2012-06-20 安徽华东光电技术研究所 一种行波管电子枪系统定位弹片的制作工艺
CN102501032B (zh) * 2011-12-02 2014-01-08 安徽华东光电技术研究所 一种行波管电子枪系统定位弹片的制作工艺

Also Published As

Publication number Publication date
WO1987002507A1 (fr) 1987-04-23
DE3666522D1 (en) 1989-11-23
JPH0437535B2 (fr) 1992-06-19
EP0243399A1 (fr) 1987-11-04
JPS63501182A (ja) 1988-04-28

Similar Documents

Publication Publication Date Title
US4712294A (en) Method of forming a helical wave guide assembly by precision coining
US3612934A (en) Collector for electron tubes
US3670196A (en) Helix delay line for traveling wave devices
US5173669A (en) Slow-wave structure having block supported helix structure
CN101642865A (zh) 螺旋线慢波组件制备的无变形热挤压方法
US3810302A (en) Method of manufacturing a wave-guide
EP0243399B1 (fr) Procede d'emboutissage de precision et assemblage a element helicoidal embouti
CN101533747B (zh) 一种宽频带行波管的螺旋线慢波系统制作方法
EP0214611A2 (fr) Anode de magnétron et méthode de fabrication d'une telle anode
EP0290592B1 (fr) Procede d'assujettissement d'une structure a ondes lentes dans une structure enveloppante avec des elements d'espacement sertis
US4947467A (en) Traveling-wave tube slow-wave structure with integral conductively-loaded barrel and method of making same
US5384951A (en) Method of making anisotropically loaded helix assembly for a traveling-wave tube
US3374388A (en) Traveling wave tube having tapered grooves and shims for improved thermal contact between metal envelope, support rods and slow wave helix
CN102324355A (zh) 一种行波管螺旋线夹持装置及其装配工艺
JP2661520B2 (ja) 多空胴クライストロン
JP2862970B2 (ja) 進行波管のらせん回路組立用治具およびらせん回路組立方法
US4146949A (en) Method for making a magnetron anode
CN106783470A (zh) 用于复合管壳螺旋线慢波结构的装配模具及装配方法
US5964633A (en) Method of heat shrink assembly of traveling wave tube
US2879436A (en) Traveling wave tube and method of constructing the same
JP2787865B2 (ja) らせん形遅波回路構体
RU2066499C1 (ru) Способ изготовления замедляющих систем спирального типа
KR100237928B1 (ko) 희토류계 영구자석 제조용 금속튜브
JPH0398243A (ja) 熱伝導性機械的支持体を有する進行波管
JPH0498736A (ja) ヘリックス形進行波管の製造方法

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19870611

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB IT

17Q First examination report despatched

Effective date: 19890131

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB IT

REF Corresponds to:

Ref document number: 3666522

Country of ref document: DE

Date of ref document: 19891123

ET Fr: translation filed
ITF It: translation for a ep patent filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
ITTA It: last paid annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19970811

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19970815

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19970818

Year of fee payment: 12

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980915

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19980915

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19990531

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19990701

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050915