CN101642865A - Deformation-free thermal extrusion method for helix slow-wave component preparation - Google Patents
Deformation-free thermal extrusion method for helix slow-wave component preparation Download PDFInfo
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- CN101642865A CN101642865A CN200810118015A CN200810118015A CN101642865A CN 101642865 A CN101642865 A CN 101642865A CN 200810118015 A CN200810118015 A CN 200810118015A CN 200810118015 A CN200810118015 A CN 200810118015A CN 101642865 A CN101642865 A CN 101642865A
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Abstract
The invention discloses a deformation-free thermal extrusion method for helix slow-wave component preparation, which relates to the microwave device technology and is used for preparing a helix travelling wave tube component. The method comprises the following steps: placing and fixing a metal tube shell on an extrusion platform, feeding a helix and a medium clamping rod into an extrusion die, heating the tube shell firstly to increase the inside diameter of the tube shell, pushing the helix and the clamping rod of which positions are well fixed to the tube shell by using a push rod, then stopping heating, taking down the extrusion die, recovering the temperature of the whole component to the room temperature, and generating a great contraction force at the moment due to the contraction ofthe inside diameter of the tube shell to be applied to the helix and the clamping rod component to firmly extrude the both inside the tube shell so as to finish the preparation of the slow-wave component. Various dies required by the method can be prepared by machining of a linear cutting electro-discharge machine tool. The method not only can well improve the heat dissipation performance of theslow-wave component, but also can avoid the component structure deformation, dielectric performance reduction and high-frequency loss increment caused by the conventional assembly method.
Description
Technical field
The present invention relates to the microwave device technical field, particularly a kind of deformation-free thermal extrusion method of helix slow-wave component preparation is the preparation method of the strong helix TWT slow wave component of heat-sinking capability.
Background technology
Broadband, high-power traveling wave tube are the microwave devices that plays key effect in electronic countermeasure, fire control system and the communication field, its performance has decisive role to these dual-use systems, slow wave system is again the critical component of decision travelling-wave tubes performance, and the slow-wave structure of seeking broadband, efficient and better thermal conductivity is to satisfying present national defence needs and following military electronics all are vital.In the various characteristics of helix TWT, thermal characteristics is a very important index, and it is not only the principal element of decision travelling-wave tubes average output power, also is directly to affect the stability of travelling-wave tubes work and the key factor of reliability.When the slow-wave component temperature is too high, not only can cause the decline of average output power, also may cause the damage physically of whole travelling-wave tubes.In the development and production process of high power CW ripple travelling-wave tubes, slow wave component heat dispersion directly influences the yield rate and the service life of device.Therefore the research of helix slow-wave component heat dispersion has become to improve an important directions of travelling-wave tubes performance.
At present the preparation method of slow-wave component mainly contains: coldly suppress method, graphite hot extrusion method, twine molybdenum band hot extrusion method etc.
(1) the cold method of suppressing---mainly be at the situation that is evenly distributed with three supporting rods around helix.This is a method of utilizing the elastic deformation force of shell to step up dielectric rod and helix at normal temperatures.Utilize earlier external strength inwardly that relatively thick hollow cylinder shell is deformed into triangular cross-section structure near the supporting rod distribution profile, supporting rod and helix are embedded, the cancellation external force utilizes the back stretch of shell self that supporting rod and helix are pressed together.Utilize the method, shell must be selected elasticity material preferably for use, magnetic Monel and the stainless steel of having or not commonly used.
Pluses and minuses: the cold method technology of suppressing is simpler, and clamping is more firm, and certain mechanical shock of ability and vibration are applicable to the minor diameter shell.Therefore, the cold method of suppressing extensively adopts in the little pulse of power and CW TWT are made.Shortcoming is the strictness of accessory size tolerance, and heat-sinking capability is relatively poor, causes the shell distortion easily.
(2) graphite hot-extrusion method---it is to utilize low-expansion extrusion die (as graphite), at high temperature limits being radially expanded of shell, makes the shell cooling after-contraction of plastic deformation, and supporting rod and helix are compressed, and obtains excellent contact.
Pluses and minuses: technology realizes not very complicated, and this method is compared with the cold method of suppressing, and is having a clear superiority in aspect the raising heat-sinking capability.But, this method makes the shell distortion easily.
(3) twine molybdenum band hot extrusion method---this method be cold suppress assembled assembly after, twine shell with the molybdenum band, assembly is increased temperature, utilize the coefficient of expansion of the coefficient of expansion of molybdenum less than shell, the shell material inwardly pushes, thereby reaches assembly contact purpose more closely.
Pluses and minuses: processing step is more, and it is comparatively convenient to realize.Handle through repeatedly twining, can comparatively effectively improve the heat-sinking capability of slow-wave component.But, this method causes the distortion of shell easily, particularly when repeatedly twining, easier modular construction is exerted an influence.
When travelling-wave tubes was worked, electronics that defocuses and high-frequency loss made the temperature of helix raise, and the thermal contact resistance of parts contact position is to influence the principal element that the helix heat outwards sheds.The employing of different assembly methods directly affects the tightness degree of each component assembling, thus the thermal contact resistance of decision contact-making surface.In order to improve the heat-sinking capability of slow-wave component, and guarantee that the structure of each assembly deformation can not take place, just need the tight ness rating of suitable raising component assembling, and farthest reduce the influence of thermal contact resistance.
Summary of the invention
The purpose of this invention is to provide the deformation-free thermal extrusion method of a kind of helix slow-wave component preparation, farthest reduce thermal contact resistance, solving the heat dissipation problem of helix TWT slow wave component, thus the stability when improving travelling-wave tubes work.
In order to achieve the above object, technical solution of the present invention is:
A kind of deformation-free thermal extrusion method of helix slow-wave component preparation, it comprises that step is as follows:
Step 1: Can (1) is placed on the shell jig (8) on the squeeze station (7), use backstay (12) according to the fixing shell (1) in tram, helix (3) and medium supporting rod (2) are packed in hollow (5) of extrusion die (4) according to the relative position that designs;
Step 2: the Can (1) that is fixed on the squeeze station (7) is heated, make its expanded by heating, internal diameter increases;
Step 3: extrusion die (4) is pushed squeeze station (7) along dovetail groove track (6), align with shell (1), push rod is pushed in hollow (5) of extrusion die (4), make helix (3) and the supporting rod (2) put be squeezed into shell (1), constitute the helix slow-wave component blank;
Step 4: stop the slow-wave component blank is heated, the extrusion die (4) that push rod is housed is taken off, the temperature for the treatment of whole slow-wave component blank returns to room temperature, at this moment shell (1) Yin Wendu reduces and the contraction internal diameter, produce great convergent force, be applied on helix (3) and the supporting rod (2), each parts are pressed together closely, finish the preparation of slow-wave component.
Described method, its described shell jig (8) comprises mould cover (11), backstay (12) and central channel (13), is positioned at hydrogen (10) passage of heating generator (9); The shape of mould cover (11) boring is inner consistent with shell (1), axially to be fixed in an end of central channel (13); Backstay (12) is consistent with the shape of shell (1) inside, and length is greater than mould cover (11), and the mode of stretching out with two ends is placed in the mould cover (11); The cross section of central channel 13 and shell (1) cylindrical is suitable, and the bottom surface is fixed on the squeeze station (7).
Described method, in its described step 1 Can (1) is placed on the shell jig (8) on the squeeze station (7), be with on shell to be assembled (1) the centre groove (13), prop up shell (1) with mould cover (11), according to correct fixed-site shell (1), end with backstay (12) inserts in the shell (1) to be assembled again, thereby makes shell (1) fixing.
Described method heats Can (1) in its described step 2, and heating-up temperature is 780～820 ℃.
Good effect of the present invention is: the heat-sinking capability of not having the slow-wave component of distortion hot extrusion method preparation is cold 3-4 times of suppressing method.Traditional molybdenum band hot extrusion method its heat-sinking capabilities after carrying out four extruding that twine do not reach the slow-wave component heat-sinking capability of not having the preparation of distortion hot extrusion method yet.Traditional graphite extrusion prepares the heat dispersion of assembly can be with not have the distortion hot extrusion comparable, but this hot extrusion method is because the processing of cold-extruded and graphite jig is former thereby cause twice distortion of slow-wave component, thereby cause the microwave reflection point to increase.Utilize this method to prepare slow-wave component, when improving heat dissipation characteristics, can not produce harmful effect, also can not cause the distortion of modular construction the high frequency characteristics of assembly.
Description of drawings
Fig. 1 is a helix TWT slow wave component structural representation of the present invention;
Fig. 2 is not for there being the apparatus schematic diagram of distortion hot extrusion method;
Fig. 3 is the sectional view of extrusion die;
Fig. 4 is the structure chart of shell jig;
Fig. 5 is the sectional view of the central channel of shell jig;
The sectional view of Fig. 6 squeeze station and last dovetail groove track thereof;
Fig. 7 is the cold heat-sinking capability comparison diagram that suppresses method, twines the slow-wave component of molybdenum band hot extrusion method and the preparation of nothing distortion hot extrusion method for four times;
Fig. 8 is the cold heat-sinking capability comparison diagram that suppresses method, graphite hot extrusion method and do not have the slow-wave component of distortion hot extrusion method preparation;
Fig. 9 is for adopting the graphite hot extrusion method and not having the slow-wave component standing-wave ratio situation comparison diagram that is out of shape the hot extrusion method preparation, and wherein (a) is frequency domain figure, (b) is time-domain diagram.
The drawing reference numeral explanation
The 1-shell, 2-supporting rod, 3-helix, 4-extrusion die, 5-is hollow, 6-dovetail groove track, 7-squeeze station, 8-shell jig, the 9-heating generator, 10-hydrogen, 11-mould cover, the 12-backstay, 13-central channel, the cold assembly that suppresses of 14-, 15-twines the assembly of molybdenum band for the first time, and 16-twines the assembly of molybdenum band for the second time, and 17-twines the assembly of molybdenum band for the third time, 18-twines the assembly of molybdenum band for the 4th time, and 19-does not have the assembly of distortion hot extrusion, the assembly of 20-graphite hot extrusion.
The specific embodiment
As shown in Figure 1, be the strong helix slow-wave component structural representation of the heat-sinking capability of being made up of shell 1, helix 3 and supporting rod 2 of the present invention, the present invention forms slow-wave component with medium supporting rod 2 and helix 3 with Can 1.The inwall of shell 1 contacts with medium supporting rod 2 intimate, and medium supporting rod 2 inner surfaces closely contact with helix 3 outer wall surface, and helix 3 adopts molybdenum helix or other wire spiral.Medium supporting rod 2 usefulness aluminium oxide, beryllium oxide or boron nitride are made.
The deformation-free thermal extrusion method of helix slow-wave component preparation of the present invention, mainly utilized assembly equipment as shown in Figure 2 and other moulds of part: the cross section situation of squeeze station 7 has dovetail groove track 6 as shown in Figure 6 on it, be used to finish component assembling; The cross section situation of extrusion die 4 as shown in Figure 3, its length is identical with shell 1, it is mainly used to place helix to be assembled 3 and supporting rod 2; Hollow 5 consistent in the shape of push rod and the extrusion die 4, length is identical with shell 1, is used for the helix in the extrusion die 43 and supporting rod 2 are pushed the shell 1 of expansion; The structure of shell jig 8 as shown in Figure 4, it is fixed on the squeeze station 7, mould cover 11 and central channel 13 are arranged on it, on the shell 1 centre groove 13 to be assembled, the cross section of central channel 13 as shown in Figure 5, the shape that mould overlaps 11 borings is inner consistent with shell 1, and it is mainly used to according to correct fixed-site shell 1; Backstay 12 is consistent with the shape of shell 1 inside, and length is greater than mould cover 11, and it is placed in mould cover 11 hollow of shell jig 8, and the one end passes mould cover 11, insert slightly in the shell to be assembled 1, thus fixing shell 1; Heating generator 9 is used to heat shell 1, and the control temperature makes the suitable expansion of shell 1.
The mould that does not have distortion hot extrusion use is to make with the indium steel, and concrete preparation for processing is as follows:
The first step: use line cutting spark-erosion machine tool processing dovetail groove track 6, thereby realize that shell 1 to be extruded and the extrusion die 4 that helix 3 and supporting rod 2 are housed move on same track.
Second step: obtain the center height of shell 1 and the center height of extrusion die 4, require both to equate.Utilize that two inclined-planes of the external diameter of shell 1 and dovetail groove track 6 are tangent can obtain mold center's height.
The 3rd step: the center that processes extrusion die 4 with this center height.The slide feet of extrusion die 4 matches with dovetail groove track 6.
The 4th step: use line cutting spark-erosion machine tool processing shell jig 8, middle heart shape is consistent with shell 1 interior shape.
The 5th step: use line cutting spark-erosion machine tool processing backstay 12 and push rod.Backstay 12 is consistent with shell 1 internal diameter shape, cooperates to should be sliding fit; Push rod is identical with hollow 5 shapes of extrusion die 4, cooperates to should be free tolerance, slidably gets final product.
The deformation-free thermal extrusion method of helix slow-wave component preparation of the present invention, concrete steps are as follows:
Step 1: Can 1 is placed on the shell jig 8 on the squeeze station 7, uses backstay 12 according to the fixing shell 1 in tram, with helix 3 and medium supporting rod 2 according to the relative position that designs pack into extrusion die 4 hollow 5 in;
Step 2: utilize the principle of expanding with heat and contract with cold, the Can 1 that is fixed on the squeeze station 7 is heated, make its expanded by heating, internal diameter increases;
Step 3: extrusion die 4 is pushed squeeze station 7 along dovetail groove track 6, aligns with shell 1, with push rod push extrusion die 4 hollow 5 in, make helix 3 and the supporting rod 2 put be squeezed into shell 1, constitute the helix slow-wave component blank;
Step 4: stop the slow-wave component blank is heated, the extrusion die 4 that push rod is housed is taken off, the temperature for the treatment of whole slow-wave component blank returns to room temperature, at this moment shell 1 shrinks internal diameter because of temperature reduces, produce great convergent force, be applied on helix 3 and the supporting rod 2, each parts are pressed together closely, finish the preparation of slow-wave component.
The slow-wave component of the inventive method preparation, each parts contact closely, thermal contact resistance reduces, can be in the slow-wave component course of work, the heat of helix 3 parts is delivered to Can 1 rapidly by medium supporting rod 2, thereby has avoided helix 3 local temperatures too high and cause helix 3 venting or burn.
Fig. 7 is for coldly suppressing method, twining the comparable situation that concerns of the adding power of the slow-wave component that molybdenum band hot extrusion method and new nothing distortion hot extrusion method prepare and helix temperature for four times.
Table 1 has provided and has adopted traditional cold comparison (supporting rod is BeO) of suppressing the heat-sinking capability of the slow-wave component that method, tradition twine molybdenum band hot extrusion method and new nothing distortion hot extrusion method preparation.
Table 1:
In the time of can finding out 300 ℃ from table 1, the assembly 19 that does not have the preparation of distortion hot extrusion method is cold more than three times of assembly 14 heat-sinking capabilities that suppress the method preparation, is more than four times in the time of 400 ℃.Twine molybdenum band hot extrusion method and carried out four times, its heat-sinking capability does not reach does not yet have the distortion hot extrusion method.
Fig. 8 has provided the cold heat-sinking capability comparable situation (supporting rod is BeO) of suppressing method, graphite hot extrusion method and not having the slow-wave component of distortion hot extrusion method preparation.
Its heat-sinking capability had had large increase after the as can be seen from Figure 8 cold assembly 14 that suppresses preparation passed through the hot extrusions of graphite method, had almost reached the heat dispersion that does not have the distortion hot extrusion.But this method is owing to the effect through twice mechanical force, and graphite jig does not reach the precision of outstanding pressure pipe shell far away.Therefore shell 1 deformation ratio of the slow-wave component 20 of process graphite extruding is bigger, can be found out by the variation of standing-wave ratio among Fig. 9.Fig. 9 a is graphite hot extrusion method and the contrast of nothing distortion hot extrusion method frequency domain; Fig. 9 b is graphite hot extrusion method and the contrast of nothing distortion hot extrusion method time domain.
In sum, Fig. 7 and Fig. 8 have provided the heat dispersion curve comparable situation of the slow-wave component of the inventive method and the preparation of other several method.Experimental result show heat-sinking capability that novel preparation process does not have a slow-wave component of distortion hot extrusion method preparation be the cold 3-4 that suppresses method doubly.Traditional molybdenum band hot extrusion method its heat-sinking capabilities after carrying out four extruding that twine do not reach the slow-wave component heat-sinking capability of not having the preparation of distortion hot extrusion method yet.Traditional graphite extrusion prepares the heat dispersion of assembly can be with not have the distortion hot extrusion comparable, but this hot extrusion method is because the processing of cold-extruded and graphite jig is former thereby cause twice distortion of slow-wave component, thereby cause the microwave reflection point to increase, as shown in Fig. 9 a and Fig. 9 b.
It below only is the specific embodiment of the present invention; but protection scope of the present invention is not limited thereto; any people who is familiar with this technology can understand conversion or the replacement expected in the disclosed technical scope of the present invention, all should be encompassed within the protection domain of claims of the present invention.
Claims (4)
1, a kind of deformation-free thermal extrusion method of helix slow-wave component preparation is characterized in that, comprises that step is as follows:
Step 1: Can (1) is placed on the shell jig (8) on the squeeze station (7), use backstay (12) according to the fixing shell (1) in tram, helix (3) and medium supporting rod (2) are packed in hollow (5) of extrusion die (4) according to the relative position that designs;
Step 2: the Can (1) that is fixed on the squeeze station (7) is heated, make its expanded by heating, internal diameter increases;
Step 3: extrusion die (4) is pushed squeeze station (7) along dovetail groove track (6), align with shell (1), push rod is pushed in hollow (5) of extrusion die (4), make helix (3) and the supporting rod (2) put be squeezed into shell (1), constitute the helix slow-wave component blank;
Step 4: stop the slow-wave component blank is heated, the extrusion die (4) that push rod is housed is taken off, the temperature for the treatment of whole slow-wave component blank returns to room temperature, at this moment shell (1) Yin Wendu reduces and the contraction internal diameter, produce great convergent force, be applied on helix (3) and the supporting rod (2), each parts are pressed together closely, finish the preparation of slow-wave component.
2, the method for claim 1 is characterized in that, described shell jig (8) comprises mould cover (11), backstay (12) and central channel (13), is positioned at hydrogen (10) passage of heating generator (9); The shape of mould cover (11) boring is inner consistent with shell (1), axially to be fixed in an end of central channel (13); Backstay (12) is consistent with the shape of shell (1) inside, and length is greater than mould cover (11), and the mode of stretching out with two ends is placed in the mould cover (11); The cross section of central channel 13 and shell (1) cylindrical is suitable, and the bottom surface is fixed on the squeeze station (7).
3, method as claimed in claim 1 or 2, it is characterized in that, in the described step 1 Can (1) is placed on the shell jig (8) on the squeeze station (7), be with on shell to be assembled (1) the centre groove (13), prop up shell (1) with mould cover (11), according to correct fixed-site shell (1), the end with backstay (12) inserts in the shell (1) to be assembled again, thereby makes shell (1) fixing.
4, the method for claim 1 is characterized in that, in the described step 2 Can (1) is heated, and heating-up temperature is 780～820 ℃.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102044392A (en) * | 2010-12-13 | 2011-05-04 | 安徽华东光电技术研究所 | Assembly process for slow wave system of helical line travelling wave tube |
| CN102990301A (en) * | 2012-11-27 | 2013-03-27 | 南京三乐电子信息产业集团有限公司 | Method for processing composite pipe shell with 120-degree equally divided straight flutes |
| CN105050377A (en) * | 2015-08-26 | 2015-11-11 | 广州中国科学院先进技术研究所 | Clamping and force measurement device for tube shell of slow-wave module |
| CN107041120A (en) * | 2017-05-12 | 2017-08-11 | 广州中国科学院先进技术研究所 | A kind of slow-wave component shell cold extrusion device |
| CN107263089A (en) * | 2017-05-16 | 2017-10-20 | 广州中国科学院先进技术研究所 | A kind of slow-wave component shell cold extrusion sub-mounts |
| CN109702282A (en) * | 2018-11-29 | 2019-05-03 | 南京三乐集团有限公司 | Three plane surface processing method of helix |
| CN109755083A (en) * | 2018-11-29 | 2019-05-14 | 南京三乐集团有限公司 | A kind of helix line slow-wave system thermal expansion assembly method |
| CN109783923A (en) * | 2019-01-08 | 2019-05-21 | 电子科技大学 | A kind of emulation mode of helix TWT high-frequency structure graphite hot extrusion technique |
| CN110690088A (en) * | 2019-10-16 | 2020-01-14 | 南京三乐集团有限公司 | Assembly method of helix traveling wave tube high-frequency circuit |
| CN114927398A (en) * | 2022-06-10 | 2022-08-19 | 电子科技大学 | Microstrip line slow wave structure |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102044392A (en) * | 2010-12-13 | 2011-05-04 | 安徽华东光电技术研究所 | Assembly process for slow wave system of helical line travelling wave tube |
| CN102044392B (en) * | 2010-12-13 | 2012-09-05 | 安徽华东光电技术研究所 | Assembly process for slow wave system of helical line travelling wave tube |
| CN102990301A (en) * | 2012-11-27 | 2013-03-27 | 南京三乐电子信息产业集团有限公司 | Method for processing composite pipe shell with 120-degree equally divided straight flutes |
| CN105050377A (en) * | 2015-08-26 | 2015-11-11 | 广州中国科学院先进技术研究所 | Clamping and force measurement device for tube shell of slow-wave module |
| CN105050377B (en) * | 2015-08-26 | 2017-10-13 | 广州中国科学院先进技术研究所 | The clamping of slow-wave component shell and device for measuring force |
| CN107041120A (en) * | 2017-05-12 | 2017-08-11 | 广州中国科学院先进技术研究所 | A kind of slow-wave component shell cold extrusion device |
| CN107263089A (en) * | 2017-05-16 | 2017-10-20 | 广州中国科学院先进技术研究所 | A kind of slow-wave component shell cold extrusion sub-mounts |
| CN109702282A (en) * | 2018-11-29 | 2019-05-03 | 南京三乐集团有限公司 | Three plane surface processing method of helix |
| CN109755083A (en) * | 2018-11-29 | 2019-05-14 | 南京三乐集团有限公司 | A kind of helix line slow-wave system thermal expansion assembly method |
| CN109755083B (en) * | 2018-11-29 | 2021-05-18 | 南京三乐集团有限公司 | Thermal expansion assembly method for helical line slow-wave system |
| CN109783923A (en) * | 2019-01-08 | 2019-05-21 | 电子科技大学 | A kind of emulation mode of helix TWT high-frequency structure graphite hot extrusion technique |
| CN110690088A (en) * | 2019-10-16 | 2020-01-14 | 南京三乐集团有限公司 | Assembly method of helix traveling wave tube high-frequency circuit |
| CN110690088B (en) * | 2019-10-16 | 2022-03-25 | 南京三乐集团有限公司 | Assembly method of helix traveling wave tube high-frequency circuit |
| CN114927398A (en) * | 2022-06-10 | 2022-08-19 | 电子科技大学 | Microstrip line slow wave structure |
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Open date: 20100210 |