CN102847943A - Method for manufacturing magnetron molybdenum end cap through die forming - Google Patents
Method for manufacturing magnetron molybdenum end cap through die forming Download PDFInfo
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- CN102847943A CN102847943A CN2012102303457A CN201210230345A CN102847943A CN 102847943 A CN102847943 A CN 102847943A CN 2012102303457 A CN2012102303457 A CN 2012102303457A CN 201210230345 A CN201210230345 A CN 201210230345A CN 102847943 A CN102847943 A CN 102847943A
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- end cap
- molybdenum end
- molybdenum
- magnetron
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Abstract
The invention discloses a method for manufacturing a magnetron molybdenum end cap through die forming. The method comprises the steps of (1) designing a die, wherein the dimension of a sintering ingot is compared with the dimension of a pressing ingot, the dimension shrinkage ratio is calculated, and the corresponding die is manufactured as per the shrinkage ratio on the basis of the dimension and the forming method of the magnetron molybdenum end cap; (2) conducting die forming, wherein the same granulation powder as that used in Step (1) is filled into the designed die to be produced into a molybdenum end cap pressing ingot through die forming; (3) subjecting the obtained molybdenum end cap pressing ingot to vacuum degreasing presintering to obtain a molybdenum end cap degreasing presintering ingot; (4) sintering the obtained molybdenum end cap degreasing presintering ingot to obtain a molybdenum end cap sintering ingot; and (5) conducting polishing and hydrogen calcination on the obtained molybdenum end cap sintering ingot, so that a molybdenum end cap product is obtained. The molybdenum end cap produced by the method is uniform in overall density, accurate in manufacturing dimension and good in surface quality. According to the method, the molybdenum end cap is produced through die forming, so that the process flow of the method is simple, the production efficiency is high, and the mechanical automatic production can be achieved easily.
Description
Technical field
The present invention relates to magnetron cathode assembly with the manufacture method of molybdenum end cap, belong to powder metallurgy and make the field.
Background technology
Magnetron molybdenum matter fulcrum bar component is the core of magnetron, its Main Function is to utilize the good resistance to elevated temperatures of molybdenum and electric conductivity, be used for supporting the microwave magnetron transmitting coil, stop that simultaneously thermoelectron is to axially dispersing, in the useful space, form uniform distribution of charges, to guarantee the stability of microwave emission.The molybdenum end cap is the part of magnetron molybdenum matter fulcrum bar component, forms a cover by upper end cap and each one of lower endcaps, contains the described molybdenum end cap of a cover in each magnetron molybdenum matter fulcrum bar component.The two ends of described microwave magnetron transmitting coil just are welded on respectively upper end cap and lower endcaps.Magnetron is widely used at household implements, such as micro-wave oven, and is used for industrial equipment, such as high-frequency heating apparatus, exchanges radar system etc.
But because molybdenum end cap size is little and complicated, the Forming Technique difficulty is high, and the moulding technology of molybdenum end cap still belongs to blank at home at present.
Summary of the invention
The object of the invention is to overcome molybdenum end cap moulding technology defective, a kind of magnetron molybdenum end cap die forming manufacture method is provided.
Technical scheme of the present invention is as follows:
(1) Design of Dies: prilling powder is made the Design of Dies pressed compact, this Design of Dies pressed compact is got the Design of Dies sintered blank behind vacuum degreasing pre-burning and sintering, the size of above-mentioned sintered blank and pressed compact is compared, the driven dimension shrinkage ratio, and manufacture and design corresponding mould according to magnetron with molybdenum end cap size and forming mode according to this shrinkage ratio;
(2) die forming: the used same prilling powder of step (1) is packed into is molded into molybdenum end cap pressed compact in the mould that designs;
(3) gained molybdenum end cap pressed compact is carried out the vacuum degreasing pre-burning, get molybdenum end cap degreasing presintered compact;
(4) gained molybdenum end cap degreasing presintered compact is carried out sintering, get molybdenum end cap sintered blank;
(5) gained molybdenum end cap sintered blank is polished and annealing in hydrogen atmosphere, namely get molybdenum end cap product.
In a preferred embodiment of the invention, the forming mode in the described step (1) is specific as follows:
Described molybdenum end cap comprises upper end cap and lower endcaps;
For upper end cap, its forming mode adopts a upper punch, a bottom punch and a floating punch to form; Or adopt a upper punch, a bottom punch, a floating punch and a plug to form;
For lower endcaps, its forming mode adopts a upper punch, a bottom punch and a plug to form.
In a preferred embodiment of the invention, the density of the Design of Dies pressed compact in the described step (1) is 5 ~ 7g/cm
3, the density 〉=9.6g/cm of Design of Dies sintered blank
3
In a preferred embodiment of the invention, the density of the molybdenum end cap pressed compact in the described step (2) is 5 ~ 7g/cm
3, the shaping rate of this molybdenum end cap pressed compact is 8 ~ 15/minute.
In a preferred embodiment of the invention, the vacuum degreasing pre-burning in the described step (3) is: with the speed of 1 ~ 10 ℃/min, slowly be heated to 900 ℃, carry out vacuum degreasing.
In a preferred embodiment of the invention, described step is sintered to described in (4): in hydrogen atmosphere, be heated to 1600 ~ 1800 ℃, be incubated cooling after 60 ~ 150 minutes, namely get molybdenum end cap sintered blank.
In a preferred embodiment of the invention, the Hall flow velocity≤35s/50g of described prilling powder, apparent density＞1.8g/cm
3, Particle Sizes is 2.5 μ m ~ 4.0 μ m.
The invention has the beneficial effects as follows:
1, the molybdenum end cap global density of method manufacturing of the present invention is even, and manufacturing dimension is accurate, surface quality good.
2, method of the present invention adopts die forming to produce the molybdenum end cap, and its technological process is simple, production efficiency is high, realize that easily mechanization produces automatically.
Description of drawings
Fig. 1 is the die forming action schematic diagram of upper end cap die forming process in the embodiment of the invention 1;
Fig. 2 is the die forming action schematic diagram of upper end cap die forming process in the embodiment of the invention 2;
Fig. 3 is the die forming action schematic diagram of lower endcaps die forming process in the embodiment of the invention 1 and 2;
The specific embodiment
Below by the specific embodiment by reference to the accompanying drawings, technical scheme of the present invention is further detailed and describes.
Below be the explanation to the Conceptions of field of powder metallurgy involved in the present invention:
The molybdenum end cap comprises upper end cap and lower endcaps.
Compression molding: the powder that will be shaped is packed in the rigidity die sleeve, and the stamping by the die sleeve two ends pressurizes to powder in the die sleeve and obtains the manufacturing process of required goods pressed compact again.
The basic part of mould is stamping, plug, former; Upper punch is used for the upper surface (can be flat also can be concavo-convex) of formation of parts; Bottom punch is used for the lower surface (can be flat also can be concavo-convex) of formation of parts; Plug is used for through hole, blind hole or the hole with the level of formation of parts.Stamping can be that what to fix also can be (the needing each compression ratio when being shaped to determine) of floating when being shaped
Compression ratio: this spot size height of pressed compact after shaping dress powder height ÷ compacting is finished.To become each position of parison to have a close compression ratio comparatively approaching with the shaping density of guaranteeing each position of pressed compact for General Requirements during shaping, so that each position sintered dimensions of product is shunk evenly.
Embodiment 1
(1) Design of Dies:
With Hall flow velocity 30s/50g, apparent density 2.1g/cm
3, the prilling powder of Particle Sizes 2.5 μ m adopts the compressing mode forming dimension of secondary to be
Shaping density is 6.2g/cm
3The pressed compact of even density.Pressed compact is of a size of through the post processing of polishing annealing in hydrogen atmosphere through 900 ℃ of vacuum degreasing presintering and 1700 ℃ of high temperature sinterings again
Density is 9.88g/cm
3Sintered blank, calculating its radial sintered shrinkage ratio is 1.18, the longitudinal contraction ratio is 1.16.According to the survey shrinkage ratio, manufacture and design corresponding mould according to end cap size and forming mode thereof.
(2) die forming
Powder property: Hall flow velocity 30s/50g, apparent density 2.1g/cm
3, the prilling powder of Particle Sizes 2.5 μ m.
Shaping filling design: combination product actual size and sintered dimensions shrinkage ratio are 6.2g/cm according to shaping density
3Be that compression ratio is 3 to come the designing mould filling.
1) upper end cap die forming: as shown in Figure 1, the upper end cap forming mode adopts a upper punch 1, a bottom punch 2 and a floating punch 3 to form.Detailed process is shown in a to f of Fig. 1, adjust first the mould filling, floating punch 3 fillings are 2.5mm, fixed punch 2(is bottom punch 2) filling is 6mm, powder freely is packed into former 4, opening device is suppressed, and the drift of upper punch 1 is realized floating punch 3 and upper punch 1 DL synchronization by adjustment equipment float plate floating pressure and float angle after entering former 41mm; When upper punch 1 and floating punch 3 DL synchronization 1.5mm, realize the mold pressing system of leaving behind by adjusting press top-pressure mechanism realization former 4 with upper punch 1 DL synchronization; When upper punch 1, floating punch 3, former 4 DL synchronizations 1.2 ~ 1.3mm, stop floating punch 3 descending by adjusting the float plate limit switch, upper punch 1 continues the secondary compacting that descending 0.2 ~ 0.3mm realizes floating punch 3 with former 4 simultaneously; Carry out the demoulding by the mould mode of leaving behind at last, obtain upper end cap pressed compact 6.Shaping rate is 12/min in the process, adopts continuous automatic forming mode.
2) lower endcaps die forming: as shown in Figure 3, lower endcaps 1 ' forming mode adopts a upper punch 1, a bottom punch 2 and a plug 5 to form.Detailed process is shown in a to d of Fig. 3, adjust first the mould filling, fixed punch 2(is bottom punch 2) filling is 6mm, plug 5 step fillings are 2.4mm, powder freely is packed into former 4, opening device is suppressed, and the drift of upper punch 1 is realized the mold pressing system of leaving behind by adjusting press top-pressure mechanism realization former 4, plug 5 and upper punch 1 DL synchronization after entering former 41.4 ~ 1.5mm; Behind former 4, plug 5 and the upper punch 1 DL synchronization 3mm, reach the compacting position, carry out the demoulding by the mould mode of leaving behind at last, obtain lower endcaps pressed compact 7.Shaping rate is 12/min in the process, adopts continuous automatic forming mode.
(3) the good up and down end cap that will be shaped is placed in the load bearing board, put into the vacuum degreasing stove, heating rate with 1 ~ 10 ℃/min is raised to 300 ℃, heating rate with 2 ℃/min behind the insulation 90min is raised to 500 ℃, insulation 90min carries out degreasing, then the heating rate with 6 ℃/min is raised to 900 ℃, and insulation 120min carries out pre-burning, obtains the degreasing presintered compact.
(4) the degreasing presintered compact is put into high temperature sintering furnace, in hydrogen atmosphere, adopt interim the intensification, carried out sintering in 2 hours in 1700 ℃ of insulations, obtain sintered blank.
(5) sintered blank is added in the polishing machine polish, and in hydrogen atmosphere, carry out annealing in hydrogen atmosphere in 1200 ℃ of insulation 60min and process, obtain final products.
The products obtained therefrom dimensional accuracy is high, and radial dimension fluctuates at 0.005 ~ 0.02mm, and longitudinal size is between 0.01 ~ 0.03mm, and surface smoothness is good, can reach the requirement of product operation technique.
(1) Design of Dies:
With Hall flow velocity 30s/50g, apparent density 2.1g/cm
3, the prilling powder of Particle Sizes 2.5 μ m adopts the compressing mode forming dimension of secondary to be
Shaping density is 6.2g/cm
3The pressed compact of even density.Pressed compact is of a size of through the post processing of polishing annealing in hydrogen atmosphere through 900 ℃ of vacuum degreasing presintering and 1700 ℃ of high temperature sinterings again
Density is 9.88g/cm
3Sintered blank, calculating its radial sintered shrinkage ratio is 1.18, the longitudinal contraction ratio is 1.16.According to the survey shrinkage ratio, manufacture and design corresponding mould according to end cap size and forming mode thereof.
(2) die forming
Powder property: Hall flow velocity 30s/50g, apparent density 2.1g/cm
3, the prilling powder of Particle Sizes 2.5 μ m.
Shaping filling design: combination product actual size and sintered dimensions shrinkage ratio are 6.2g/cm according to shaping density
3Be that compression ratio is 3 to come the designing mould filling.
1) upper end cap die forming: as shown in Figure 2, the upper end cap forming mode adopts a upper punch 1, a bottom punch 2, a floating punch 3 and a plug 5 to form.Detailed process is shown in a to f of Fig. 2, adjust first the mould filling, floating punch 3 fillings are 1.1mm, fixed punch 2(is bottom punch 2) filling is 3.2mm, plug 5 fillings are 2.4mm, powder freely is packed into former 4, and opening device is suppressed, and the drift of upper punch 1 is realized floating punch 3 and upper punch 1 DL synchronization by adjustment equipment float plate floating pressure and float angle after entering former 40.3mm; When upper punch 1 and floating punch 3 DL synchronization 0.8mm, realize the mold pressing system of leaving behind by adjusting press top-pressure mechanism realization former 4 with upper punch 1 DL synchronization; When upper punch 1, floating punch 3, former 4 DL synchronizations 0.1 ~ 0.2mm, stop floating punch descending by adjusting the float plate limit switch, upper punch 1 continues the secondary compacting that descending 0.2 ~ 0.3mm realizes floating punch 3 with former 4 simultaneously; Carry out the demoulding by the mould mode of leaving behind at last, obtain upper end cap pressed compact 6 '.Shaping rate is 15/min in the process, adopts continuous automatic forming mode.
2) lower endcaps die forming: as shown in Figure 3, lower endcaps 1 ' forming mode adopts a upper punch 1, a bottom punch 2 and a plug 5 to form.Detailed process is shown in a to d of Fig. 3, adjust first the mould filling, fixed punch 2(is bottom punch 2) filling is 6mm, plug 5 step fillings are 2.4mm, powder freely is packed into former 4, opening device is suppressed, and the drift of upper punch 1 is realized the mold pressing system of leaving behind by adjusting press top-pressure mechanism realization former 4, plug 5 and upper punch 1 DL synchronization after entering former 41.4 ~ 1.5mm; Behind former 4, plug 5 and the upper punch 1 DL synchronization 3mm, reach the compacting position, carry out the demoulding by the mould mode of leaving behind at last, obtain lower endcaps pressed compact 7.Shaping rate is 15/min in the process, adopts continuous automatic forming mode.
(3) the good up and down end cap that will be shaped is placed in the load bearing board, put into the vacuum degreasing stove, heating rate with 1 ~ 10 ℃/min is raised to 300 ℃, heating rate with 2 ℃/min behind the insulation 90min is raised to 500 ℃, insulation 90min carries out degreasing, then the heating rate with 6 ℃/min is raised to 900 ℃, and insulation 120min carries out pre-burning, obtains the degreasing presintered compact.
(4) the degreasing presintered compact is put into high temperature sintering furnace, in hydrogen atmosphere, adopt interim the intensification, carried out sintering in 150 minutes in 1600 ℃ of insulations, obtain sintered blank.
(5) sintered blank is added in the polishing machine polish, and in hydrogen atmosphere, carry out annealing in hydrogen atmosphere in 1200 ℃ of insulation 60min and process, obtain final products.
The products obtained therefrom dimensional accuracy is high, and radial dimension fluctuates at 0.005 ~ 0.02mm, and longitudinal size is between 0.01 ~ 0.03mm, and surface smoothness is good, can reach the requirement of product operation technique.
The above only is preferred embodiment of the present invention, therefore can not limit according to this scope of the invention process, the equivalence of namely doing according to claim of the present invention and description changes and modifies, and all should still belong in the scope that the present invention contains.
Claims (7)
1. a magnetron is characterized in that: comprise the steps: with molybdenum end cap die forming manufacture method
(1) Design of Dies: prilling powder is made the Design of Dies pressed compact, this Design of Dies pressed compact is got the Design of Dies sintered blank behind vacuum degreasing pre-burning and sintering, the size of above-mentioned sintered blank and pressed compact is compared, the driven dimension shrinkage ratio, and manufacture and design corresponding mould according to magnetron with molybdenum end cap size and forming mode according to this shrinkage ratio;
(2) die forming: the used same prilling powder of step (1) is packed into is molded into molybdenum end cap pressed compact in the mould that designs;
(3) gained molybdenum end cap pressed compact is carried out the vacuum degreasing pre-burning, get molybdenum end cap degreasing presintered compact;
(4) gained molybdenum end cap degreasing presintered compact is carried out sintering, get molybdenum end cap sintered blank;
(5) gained molybdenum end cap sintered blank is polished and annealing in hydrogen atmosphere, namely get molybdenum end cap product.
2. a kind of magnetron as claimed in claim 1 is with molybdenum end cap die forming manufacture method, and it is characterized in that: the forming mode in the described step (1) is specific as follows:
Described molybdenum end cap comprises upper end cap and lower endcaps;
For upper end cap, its forming mode adopts a upper punch, a bottom punch and a floating punch to form; Or adopt a upper punch, a bottom punch, a floating punch and a plug to form;
For lower endcaps, its forming mode adopts a upper punch, a bottom punch and a plug to form.
3. a kind of magnetron as claimed in claim 1 is with molybdenum end cap die forming manufacture method, and it is characterized in that: the density of the Design of Dies pressed compact in the described step (1) is 5 ~ 7g/cm
3, the density 〉=9.6g/cm of Design of Dies sintered blank
3
4. a kind of magnetron as claimed in claim 1 is with molybdenum end cap die forming manufacture method, and it is characterized in that: the density of the molybdenum end cap pressed compact in the described step (2) is 5 ~ 7g/cm
3, the shaping rate of this molybdenum end cap pressed compact is 8 ~ 15/minute.
5. a kind of magnetron as claimed in claim 1 is with molybdenum end cap die forming manufacture method, and it is characterized in that: the vacuum degreasing pre-burning in the described step (3) is: with the speed of 1 ~ 10 ℃/min, slowly be heated to 900 ℃, carry out vacuum degreasing.
6. a kind of magnetron as claimed in claim 1 is with molybdenum end cap die forming manufacture method, it is characterized in that: described step is sintered to described in (4): in hydrogen atmosphere, be heated to 1600 ~ 1800 ℃, be incubated cooling after 60 ~ 150 minutes, namely get molybdenum end cap sintered blank.
7. such as the described a kind of magnetron of arbitrary claim in the claim 1 to 5 molybdenum end cap die forming manufacture method, it is characterized in that: the Hall flow velocity≤35s/50g of described prilling powder, apparent density＞1.8g/cm
3, Particle Sizes is 2.5 μ m ~ 4.0 μ m.
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Cited By (7)
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| CN103934458A (en) * | 2014-05-13 | 2014-07-23 | 苏州新锐合金工具股份有限公司 | Manufacture method for superfine hard alloy blind hole bars |
| CN103934457A (en) * | 2013-01-22 | 2014-07-23 | 中磁科技股份有限公司 | Special-shaped rare earth magnetic steel forming method |
| CN104907556A (en) * | 2015-06-26 | 2015-09-16 | 广州宝狮无线供电技术有限公司 | Molybdenum end cap used for magnetron pole assembly and production process thereof |
| CN106493359A (en) * | 2016-11-17 | 2017-03-15 | 宁波韵升股份有限公司 | A kind of mould for preparing multipole sintered rare-earth permanent magnetic body green compact |
| CN110125391A (en) * | 2019-05-13 | 2019-08-16 | 自贡硬质合金有限责任公司 | Die and method for manufacturing pressed blank with step |
| CN111347223A (en) * | 2020-03-31 | 2020-06-30 | 佛山市海欣光电科技有限公司 | Preparation method of molybdenum long lead for magnetron |
| CN113715399A (en) * | 2021-08-30 | 2021-11-30 | 天通吉成机器技术有限公司 | Adjustable core rod device and powder forming die |
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|---|---|---|---|---|
| CN103934457A (en) * | 2013-01-22 | 2014-07-23 | 中磁科技股份有限公司 | Special-shaped rare earth magnetic steel forming method |
| CN103934457B (en) * | 2013-01-22 | 2016-05-18 | 中磁科技股份有限公司 | Abnormity rare earth magnetic steel forming method |
| CN103934458A (en) * | 2014-05-13 | 2014-07-23 | 苏州新锐合金工具股份有限公司 | Manufacture method for superfine hard alloy blind hole bars |
| CN103934458B (en) * | 2014-05-13 | 2016-01-13 | 苏州新锐合金工具股份有限公司 | The preparation method of ultra-fine cemented carbide blind hole bar |
| CN104907556A (en) * | 2015-06-26 | 2015-09-16 | 广州宝狮无线供电技术有限公司 | Molybdenum end cap used for magnetron pole assembly and production process thereof |
| CN106493359A (en) * | 2016-11-17 | 2017-03-15 | 宁波韵升股份有限公司 | A kind of mould for preparing multipole sintered rare-earth permanent magnetic body green compact |
| CN110125391A (en) * | 2019-05-13 | 2019-08-16 | 自贡硬质合金有限责任公司 | Die and method for manufacturing pressed blank with step |
| CN111347223A (en) * | 2020-03-31 | 2020-06-30 | 佛山市海欣光电科技有限公司 | Preparation method of molybdenum long lead for magnetron |
| CN113715399A (en) * | 2021-08-30 | 2021-11-30 | 天通吉成机器技术有限公司 | Adjustable core rod device and powder forming die |
| CN113715399B (en) * | 2021-08-30 | 2023-08-25 | 天通吉成机器技术有限公司 | Adjustable core rod device and powder forming die |
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Application publication date: 20130102 |