CN100542717C - A kind of prescription of molybdenum end cap of magnetic-controlled pipe molybdenum supporting rod assemlby and manufacture method thereof - Google Patents
A kind of prescription of molybdenum end cap of magnetic-controlled pipe molybdenum supporting rod assemlby and manufacture method thereof Download PDFInfo
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- CN100542717C CN100542717C CNB200510045585XA CN200510045585A CN100542717C CN 100542717 C CN100542717 C CN 100542717C CN B200510045585X A CNB200510045585X A CN B200510045585XA CN 200510045585 A CN200510045585 A CN 200510045585A CN 100542717 C CN100542717 C CN 100542717C
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Abstract
The present invention relates to a kind of prescription and injection moulding manufacture method thereof of molybdenum end cap of magnetic-controlled pipe molybdenum supporting rod assemlby, belong to powder metallurgy and make the field.Contain molybdenum powder and organic-compound system in the prescription of the present invention through selecting.Described organic-compound system comprises vegetable oil, thermoplastic and plasticizer.Molybdenum powder accounts for 80～90wt% in the described prescription, and organic-compound system accounts for 10～20wt%.Manufacture method of the present invention comprises feeding preparation, injection moulding, degreasing pre-burning, sintering, post processing etc.The metal powder injection molded technology of employing is characterized in that being shaped.Concrete steps be with vegetable oil, thermoplastic and plasticizer by weight (0.1～0.3): (0.3～0.5): (0.2～0.4) is mixing, prepare uniform feeding after adding molybdenum powder, feeding polishes at last through injection, solvent degreasing, hot degreasing pre-burning, sintering.With the product size precision height that prescription of the present invention and manufacture method produce, surface smoothness is good.
Description
Technical field
The present invention relates to a kind of prescription and injection moulding manufacture method thereof of molybdenum end cap of magnetic-controlled pipe molybdenum supporting rod assemlby, belong to powder metallurgy and make the field.
Background technology
Magnetron molybdenum matter fulcrum bar component is the core of magnetron, it mainly acts on is to utilize molybdenum good temperature resistance energy and electric conductivity, be used to support 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 upper end cap and lower endcaps respectively.
Magnetron is widely used at household implements, as micro-wave oven, and is used for industrial equipment, as high-frequency heating apparatus, exchanges radar system etc.
The prior powder metallurgy extrudate density is low, material is inhomogeneous, mechanical performance is low, is difficult for forming thin-walled complicated part.
Summary of the invention
The prior powder metallurgy extrudate density is low, material is inhomogeneous in order to overcome, mechanical performance is low, the shortcoming that is difficult for forming thin-walled complicated part, the invention provides a kind of prescription and injection moulding manufacture method thereof of molybdenum end cap of magnetic-controlled pipe molybdenum supporting rod assemlby, this method is particularly suitable for production and processing in enormous quantities, small-sized, complicated and that have the metallic element of specific (special) requirements.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of prescription of molybdenum end cap of magnetic-controlled pipe molybdenum supporting rod assemlby and manufacture method thereof, it comprises prescription design, feeding preparation, injection moulding, degreasing pre-burning, sintering and post processing.Now details are as follows respectively with it:
1, prescription design
Prescription is formed and is comprised the two large divisions: through molybdenum powder and the organic-compound system of selecting.Molybdenum powder is by hydrogen reduction method production, joins the molybdenum powder that is applicable to metal powder injection molded technological requirement that obtains specified particle size and granularmetric composition behind the powder.Organic-compound system mainly comprises vegetable oil, thermoplastic and plasticizer.Wherein vegetable oil comprises castor oil, peanut wet goods, and thermoplastic is polypropylene, polyethylene etc., and plasticizer is a paraffin.Vegetable oil, thermoplastic and plasticizer total amount accounted for 10～20wt% during prescription was formed, and molybdenum powder accounts for 80～90wt%, and wherein the weight ratio between vegetable oil, thermoplastic and the plasticizer is (0.1～0.3): (0.3～0.5): (0.2～0.4).
2, feeding preparation
Earlier mixing roll is preheated to 120～180 ℃, described plasticizer is added in the mixing roll, after the thawing vegetable oil and thermoplastic are joined in the mixing roll, with the plasticizer mixed together.Mixture is mixing under the heat and the acting in conjunction of shearing force to become uniform binder.Be broken into particle after the binder cooling.Described binder particle is further mixed in the three-dimensional blender device with described molybdenum powder.Mixture is added in the mixing roll, heat up, start rotor and mediate, make the binder of fusion be coated on equably on the molybdenum powder particle, form the mixture molten mass of the polymolecularity of segregation-free, nothing reunion.Be broken into particle after the cooling of mixture molten mass, promptly obtain injecting feeding.
3, injection moulding
Give the heating of injection machine barrel, temperature adds described injection feeding in the barrel at 100～200 ℃, and the feeding melted by heating flows, and under the injection pressure of 50～200Mpa, injects die cavity by nozzle, and the demoulding after the cooled and solidified promptly obtains injecting base.
4, degreasing pre-burning
Adopt solvent degreasing and two step of hot degreasing degreasing process.Earlier described injection base is put into organic solvent, under 30～50 ℃ temperature, slough the DDGS in the binder.Swing in the boat that fills alumina powder after taking out drying, put into the vacuum degreasing stove, heating rate is 1～10 ℃/minute, slowly is heated to 500～950 ℃, deviates from remaining binder, and pre-burning, obtains the degreasing presintered compact.
5, sintering
Degreasing presintered compact base will be heated to 1600～1800 ℃ with the degreasing base stage by stage through high temperature sintering to reach densified in hydrogen atmosphere, be incubated to cool off after 2～5 hours and come out of the stove, and promptly obtains sintered blank.
6, post processing
Because it is high that product requires surface smoothness, so sintered blank is carried out polishing.Product surface fineness after the processing is good, the dimensional accuracy height.
Among the present invention, molybdenum end cap of magnetic-controlled pipe molybdenum supporting rod assemlby adopts metal powder injection molded technology manufacturing.Metal powder injection molded technology is the metallurgical nearly clean type forming technique of a novel powder that modern plastics injection molding technology introducing field of powder metallurgy is formed.Described metal powder injection molded technology be with metal dust and binder under the acting in conjunction of heat and shearing force, be prepared into have good homogeneous, the feeding of rheological characteristic and degreasing, described feeding is heated vasopressing injection progressive die chamber in injector, become the injection base behind the cooling curing, the injection base carries out degreasing by immersing methods such as organic solvent or heating, degreasing base after the pre-burning carries out high temperature sintering again, makes the product of certain technical conditions.
The invention has the beneficial effects as follows, described metal powder injection molded technology can be made the part of high density, high accuracy, 3D shape labyrinth, this technology not only has conventional PM technique production efficiency height, good product consistency, cuts or do not have the advantage of cutting, economical and efficient less, and overcome that the prior powder metallurgy extrudate density is low, material is inhomogeneous, the low shortcoming that is difficult for forming thin-walled complicated part of mechanical performance, be particularly suitable for production and processing in enormous quantities, small-sized, complicated and that have the metallic element of specific (special) requirements.
Description of drawings
From below in conjunction with the description of accompanying drawing to summary of the invention, will make characteristics above-mentioned and others of the present invention become more clear, also be easier to understand.Wherein:
Fig. 1 is the process route chart with metal powder injection molded manufacturing molybdenum end cap of magnetic-controlled pipe molybdenum supporting rod assemlby.
Fig. 2 is the upper end cap that adopts the shape schematic diagram of a kind of molybdenum end cap of magnetic-controlled pipe molybdenum supporting rod assemlby that the described process route of Fig. 1 makes.
Fig. 3 is the lower endcaps that adopts the shape schematic diagram of a kind of molybdenum end cap of magnetic-controlled pipe molybdenum supporting rod assemlby that the described process route of Fig. 1 makes.
Fig. 4 is the upper end cap that adopts the shape schematic diagram of the another kind of molybdenum end cap of magnetic-controlled pipe molybdenum supporting rod assemlby that the described process route of Fig. 1 makes.
Fig. 5 is the lower endcaps that adopts the shape schematic diagram of the another kind of molybdenum end cap of magnetic-controlled pipe molybdenum supporting rod assemlby that the described process route of Fig. 1 makes.
The specific embodiment
The present invention will be further described below with reference to example:
The hydrogen reducing molybdenum powder is crossed 200 mesh sieve branches, extracting screen underflow.Each batch obtains the molybdenum powder that particle mean size is 3 μ m after joining powder, and purity is greater than 99.95%.Organic-compound system is selected castor oil, peanut oil, polypropylene and paraffin.
140 gram paraffin are added in the mixing rolls, heat up, treat that paraffin melts after, add 50 gram castor oil, 70 gram peanut oil and 210 gram polypropylene, melt the back rotary rotor about 3 hours, temperature is controlled at 120 ℃.Cooling back broken binder granule on disintegrating machine.
Molybdenum powder and binder granule added in the three-dimensional blender device together mixed about 1 hour.This mixture is added in the mixing roll, temperature is raised to 140 degree, start rotor and mediate 2 hours kneading time.The cooling back is broken into the injection feeding on disintegrating machine.
To inject feeding and add in the injector, and be heated to 120～180 ℃, and inject die cavity under 50Mpa pressure, the demoulding after 30 seconds obtains intact injection base.
The injection base is put into carrene, is heated to 40 ℃, sloughs the DDGS in the binder.Swing in the boat that fills alumina powder after taking out drying, put into the vacuum degreasing stove, be raised to 400 ℃ with 1 ℃/minute heating rate, be incubated 2 hours and carry out degreasing, be raised to 800 ℃ with 6 ℃/minute heating rate then, be incubated 2 hours and carry out pre-burning, obtain the degreasing presintered compact.
Degreasing presintered compact pendulum is put into high temperature sintering furnace in molybdenum boat, in hydrogen atmosphere, adopt interim the intensification, carries out sintering in 3 hours in 1700 ℃ of insulations, obtains sintered blank.
Sintered blank adds in the polishing machine polishes, and obtains final products.Product size precision height, fineness is good, reaches specification requirement.
The above, only for preferred embodiment of the present invention, so can not limit scope of the invention process with this, i.e. the equivalence of doing according to the present patent application claim and description changes and modification, all should still belong in the scope that patent of the present invention contains.
Claims (1)
1, a kind of injection moulding manufacture method of molybdenum end cap of magnetic-controlled pipe molybdenum supporting rod assemlby, its constituent comprises molybdenum powder and organic-compound system, organic-compound system comprises vegetable oil, thermoplastic and plasticizer; Molybdenum powder accounts for 80～90 weight % in the described prescription, and organic-compound system accounts for 10～20 weight %; Weight ratio between vegetable oil, thermoplastic and the plasticizer is (0.1～0.3): (0.3～0.5): (0.2～0.4); It is characterized in that described manufacture method is:
(1) mixing roll is preheated to 120～180 ℃, the plasticizer of above-mentioned prescription is added in the mixing roll, after the thawing vegetable oil and thermoplastic are joined in the mixing roll, mix with plasticizer, mixture is mixing under the heat and the acting in conjunction of shearing force to become uniform binder, is broken into the binder particle after the cooling; Described binder particle is further mixed in the three-dimensional blender device with the molybdenum powder of above-mentioned prescription, mixture is added in the mixing roll, heat up, starting rotor mediates, make the binder of fusion be coated on equably on the molybdenum powder particle, form segregation-free, do not have the polymolecularity mixture molten mass of reuniting, be broken into particle after the cooling of mixture molten mass, promptly obtain injecting feeding;
(2) the injection machine barrel is heated to 100～200 ℃, and the described injection feeding of step (1) is added in the barrel, and the feeding melted by heating flows, and under the injection pressure of 50～200Mpa, injects die cavity by nozzle, and the demoulding after the cooled and solidified promptly obtains injecting base;
(3) the described injection base of step (2) is put into organic solvent, under 30～50 ℃ temperature, slough the DDGS in the binder; Swing in the boat that fills alumina powder after taking out drying, put into the vacuum degreasing stove, heating rate is 1～10 ℃/minute, slowly is heated to 500～950 ℃, deviates from remaining binder, and pre-burning, obtains the degreasing presintered compact;
(4) the described degreasing presintered compact of step (3) is put into high temperature sintering furnace, in hydrogen atmosphere, be heated to 1600～1800 ℃ stage by stage, be incubated to cool off after 2～5 hours and come out of the stove, obtain sintered blank;
(5) the described sintered blank of step (4) is put into polishing machine and polish, obtain final products.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510045585XA CN100542717C (en) | 2005-12-13 | 2005-12-13 | A kind of prescription of molybdenum end cap of magnetic-controlled pipe molybdenum supporting rod assemlby and manufacture method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510045585XA CN100542717C (en) | 2005-12-13 | 2005-12-13 | A kind of prescription of molybdenum end cap of magnetic-controlled pipe molybdenum supporting rod assemlby and manufacture method thereof |
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| CN1981961A CN1981961A (en) | 2007-06-20 |
| CN100542717C true CN100542717C (en) | 2009-09-23 |
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| CNB200510045585XA Expired - Fee Related CN100542717C (en) | 2005-12-13 | 2005-12-13 | A kind of prescription of molybdenum end cap of magnetic-controlled pipe molybdenum supporting rod assemlby and manufacture method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104275578A (en) * | 2013-07-05 | 2015-01-14 | 佛山市海欣光电科技有限公司 | Manufacturing method of component fulcrum bar for magnetron electrode supporting |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102847943A (en) * | 2012-07-04 | 2013-01-02 | 厦门虹鹭钨钼工业有限公司 | Method for manufacturing magnetron molybdenum end cap through die forming |
| CN104275576A (en) * | 2013-07-05 | 2015-01-14 | 佛山市海欣光电科技有限公司 | Production method of components for supporting magnetron electrodes |
| CN113210606A (en) * | 2021-05-17 | 2021-08-06 | 深圳市注成科技股份有限公司 | Metal injection molding powder metallurgy repressing and re-sintering method |
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- 2005-12-13 CN CNB200510045585XA patent/CN100542717C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104275578A (en) * | 2013-07-05 | 2015-01-14 | 佛山市海欣光电科技有限公司 | Manufacturing method of component fulcrum bar for magnetron electrode supporting |
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| CN1981961A (en) | 2007-06-20 |
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