EP0243399A1 - Präzisionseinklemmungsverfahren und dadurch hergestellte wendelstruktur. - Google Patents
Präzisionseinklemmungsverfahren und dadurch hergestellte wendelstruktur.Info
- Publication number
- EP0243399A1 EP0243399A1 EP19860906073 EP86906073A EP0243399A1 EP 0243399 A1 EP0243399 A1 EP 0243399A1 EP 19860906073 EP19860906073 EP 19860906073 EP 86906073 A EP86906073 A EP 86906073A EP 0243399 A1 EP0243399 A1 EP 0243399A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- barrel
- rods
- wave structure
- slow
- support 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims description 20
- 239000003292 glue Substances 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 229910010293 ceramic material Inorganic materials 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 2
- 229910052721 tungsten Inorganic materials 0.000 claims description 2
- 239000010937 tungsten Substances 0.000 claims description 2
- 238000004026 adhesive bonding Methods 0.000 claims 2
- 239000000919 ceramic Substances 0.000 abstract description 2
- 238000010894 electron beam technology Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000001351 cycling effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- FRWYFWZENXDZMU-UHFFFAOYSA-N 2-iodoquinoline Chemical compound C1=CC=CC2=NC(I)=CC=C21 FRWYFWZENXDZMU-UHFFFAOYSA-N 0.000 description 1
- 208000011616 HELIX syndrome Diseases 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- LTPBRCUWZOMYOC-UHFFFAOYSA-N beryllium oxide Inorganic materials O=[Be] LTPBRCUWZOMYOC-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011224 oxide ceramic Substances 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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 v the helix and within the barrel.
- One prior method of mounting the helix with its slow-wave structure and support rods within the barrel has been to triangulate the barrel. Initially the barrel is circular in section and it is thereupon distorted by applying forces to three points around its circumference to alter its section from circular toward triangular. When distorted in that manner, the helical slow-wave structure with its support rods is inserted into the distorted 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.
- FIGURE 1 is an isometric view of the helical slow- wave structure with its attached support rods going into the barrel.
- FIGURE 2 shows the assembly between dies, with closure of the dies about to malleably coin the barrel around the helical slow-wave structure and its support rods for an interference fit.
- FIGURE 3 is an end view of the assembly after coining, showing the finished assembly and its inter ⁇ ference fit.
- the 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. In order to maintain the helix of the slow-wave structure 10 in position, it is supported by three support rods 12, 14 and 16.
- 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 specifi ⁇ cally identified as attaching support rod 12 to slow- wave structure 10.
- 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 0.1078 inch and an initial inside diameter of its inner cylindrical surface 22 of 0.0700 inch.
- the circumscribing circle around ' the support rods 12, 14 and 16 provides a diametrical clearance within the barrel of 0.0007 inch so that the circum ⁇ scribing circle is 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.
- FIGURE 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 0.1070 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 helix 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.
- 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)
- Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
- Forging (AREA)
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 true EP0243399A1 (de) | 1987-11-04 |
| EP0243399B1 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) |
Families Citing this family (2)
| 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 |
| 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 |
Family Cites Families (5)
| 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 |
-
1986
- 1986-09-15 EP EP19860906073 patent/EP0243399B1/de not_active Expired
- 1986-09-15 WO PCT/US1986/001889 patent/WO1987002507A1/en not_active Ceased
- 1986-09-15 JP JP61505307A patent/JPS63501182A/ja active Granted
- 1986-09-15 DE DE8686906073T patent/DE3666522D1/de not_active Expired
Non-Patent Citations (1)
| Title |
|---|
| See references of WO8702507A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO1987002507A1 (en) | 1987-04-23 |
| JPH0437535B2 (de) | 1992-06-19 |
| EP0243399B1 (de) | 1989-10-18 |
| DE3666522D1 (en) | 1989-11-23 |
| JPS63501182A (ja) | 1988-04-28 |
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| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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