EP0243399B1 - Präzisionseinklemmungsverfahren und dadurch hergestellte wendelstruktur - Google Patents

Präzisionseinklemmungsverfahren und dadurch hergestellte wendelstruktur Download PDF

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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
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English (en)
French (fr)
Other versions
EP0243399A1 (de
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/de
Application granted granted Critical
Publication of EP0243399B1 publication Critical patent/EP0243399B1/de
Expired legal-status Critical Current

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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)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)

Claims (7)

1. Verfahren zum Befestigen einer Struktur für langsame Wellen in einem Zylinder einer Wanderwellenröhre, mit den Schritten:
Montieren einer helischen Struktur (10) für langsame Wellen zwischen wenigstens drei Trägerstäben (12,14,16) mit kreisförmig begrenzten Abmessungen;
Anordnen der helischen Struktur für langsame Wellen mit den Trägerstäben in einem röhrenförmigen Zylinder (20) mit einem inneren Durchmesser, der grösser ist als der Durchmesser der kreisförmig begrenzten Abmessung;
Einfügen des röhrenförmigen Zylinders in einen Stempel (24; 26) mit gegenüberliegenden Flächen (28,30), die, wenn der Stempel geschlossen ist, einen geraden Kreiszylinder definieren, dessen Durchmesser geringfügig geringer ist, als der ursprüngliche äussere Durchmesser des Zylinders; und
Schliessen des Stempels, um den Zylinder direkt um die Trägerstäbe zu pressen, so dass die innere Grösse des Zylinders zu einem Durchmesser reduziert wird, der kleiner ist als die kreisförmig begrenzte Abmessung, um die Trägerstäbe zu umschliessen, die ihrerseits die Struktur für langsame Wellen elastisch zusammenpressen und deformieren, so dass die zusammengepresste helische Struktur für langsame Wellen eine Rückstellkraft auf die Stäbe ausübt, um die helische Struktur für langsame Wellen und die Trägerstäbe innerhalb des Zylinders festzuhalten.
2. Das Verfahren nach Anspruch 1, das ferner den einleitenden Schritt beinhaltet:
Anheften der Stäbe an die helische Struktur für langsame Wellen mittels Kleben, bevor die helische Struktur für langsame Wellen und die Stäbe in dem Zylinder eingeführt werden.
3. Das Verfahren nach Anspruch 2, das ferner nach dem Pressschritt den Schritt beinhaltet:
Entfernen des Klebstoffs zwischen der helischen Wellenstruktur und den Stäben.
4. Ein gepresster Helixaufbau für die Wanderwellenröhre, hergestellt nach dem Verfahren gemäss einem der vorangegangenen Ansprüche.
5. Der Aufbau nach Anspruch 4, worin die helische Struktur für langsame Wellen aus Wolfram ist.
6. Der Aufbau nach Anspruch 5, worin die Trägerstäbe aus einem keramischen Material sind.
7. Der Aufbau nach Anspruch 6, worin der Zylinder im wesentlichen aus Kupfer ist.
EP19860906073 1985-10-21 1986-09-15 Präzisionseinklemmungsverfahren und dadurch hergestellte wendelstruktur Expired EP0243399B1 (de)

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 (de) 1987-11-04
EP0243399B1 true EP0243399B1 (de) 1989-10-18

Family

ID=25148964

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860906073 Expired EP0243399B1 (de) 1985-10-21 1986-09-15 Präzisionseinklemmungsverfahren und dadurch hergestellte wendelstruktur

Country Status (4)

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

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

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