CN102717081A - Method for preparing miniature mold by powder micro injection forming method - Google Patents
Method for preparing miniature mold by powder micro injection forming method Download PDFInfo
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- CN102717081A CN102717081A CN2012102034747A CN201210203474A CN102717081A CN 102717081 A CN102717081 A CN 102717081A CN 2012102034747 A CN2012102034747 A CN 2012102034747A CN 201210203474 A CN201210203474 A CN 201210203474A CN 102717081 A CN102717081 A CN 102717081A
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Abstract
The invention relates to a method for preparing a miniature mold by a powder micro injection forming method. According to the method, high-hardness material powder and ceryl multi-ingredient bonding agents are adopted and mixed to be prepared into uniform feed, the feed is injected on an injection forming machine to obtain an injection blank of the miniature mold with the shape of a miniature part, the injection blank is subjected to hot degreasing and pre-sintering in a degreasing furnace after the solvent degreasing, finally, a test specimen subjected to the pre-sintering is subjected to high-temperature sintering, and the miniature mold with the good shape maintenance effect is obtained. The method provided by the invention can be used for making the miniature mold with complicated shapes in the micrometer dimension, the mold has the characteristics of high hardness, high wear resistance, low thermal conductivity coefficient and the like, an the mass production requirement of the miniature parts can be perfectly met.
Description
Technical field
The present invention relates to field of powder metallurgy, particularly adopt the method for the complex-shaped minisize mould of micro-powder injection molding technology preparation micro-meter scale.
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Background technology
In fields such as micro electronmechanical, communication, optics, chemistry, Microfluidics, the demand of miniature parts increases just year by year.The little manufacturing process of main flow comprises the little processing of body, the little processing of face and LIGA technology at present, and this exoelectron sputter processing (EDM), substrate combine photoetching technique also to be widely used in the manufacturing of MEMS.These technology all can not satisfy dimensional requirement, large-scale production and requirement cheaply simultaneously; And micro-powder injection molding provides this possibility, and the micro-powder injection molding technology becomes one of world's The Study of Manufacturing Technology focus with the advantage that the low-cost large-scale production of easy realization has the precise fine constitutional detail.The micro-powder injection molding technology starts from late 1980s; Be the earliest German IFAM research institute on the basis of conventional powder injection moulding to the little a kind of forming technique developed to the part of 1 μ m of size, this technology is a kind of small and complex-shaped metal of low cost, large-scale manufacturing dimension and near-net-shape technology of ceramic parts of being suitable for.
Making the most general material of micro-meter scale mould at present is exactly silicon.Yet; Because silicon is highly brittle, and wearability is very poor, in the manufacture process of miniature parts, damage easily; Need often with changing; The cost that had not only increased but also reduced efficient, and the dimensional accuracy and the surface quality of miniature parts all had adverse effect, therefore also limited production with precise fine constitutional detail.The micro-powder injection molding technology has been inherited the series of advantages of powder injection forming technology, and, high efficiency like adaptation material wide in variety, low-cost, size adaptability are good etc.Therefore can select for use carbide alloy, toughened zirconia ceramics etc. to have high strength, high rigidity, wear-resistant, high temperature resistant, corrosion-resistant, and material with certain toughness.The micro-powder injection molding method prepares minisize mould and also has a lot of difficulties, and is improper like process choice in powder useful load and degreasing, the sintering process, all can cause defectives such as distortion, crackle, bubbling.The WC-Co carbide alloy is very responsive to the fluctuation of carbon content, and introduces a large amount of organic binder bonds in the micro-powder injection molding process, has all increased difficulty therefore for the control carbon of carbide alloy and control sintered dimensions precision.
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Summary of the invention
The present invention seeks to solve and adopt the high hardness material powder in the micro-powder injection molding process,, cause the control carbon and the big problem of control sintered dimensions precision difficulty of high hardness material owing to introduce a large amount of organic binder bonds.
The present invention is a raw material with cemented carbide powder and Zirconium oxide powder, adopts the complex-shaped minisize mould of micro-powder injection molding technology preparation micro-meter scale.Many group members binding agent that binding agent adopts wax+high molecular polymer+surfactant to form is prepared into uniform feeding with powder and binding agent according to useful load on mixing roll.Feeding is injected mold injects base with miniature parts shape on injection; Micro-mould injection base in organic solvent through in debinding furnace, carrying out hot degreasing and presintering after the solvent degreasing; At last the presintering base is carried out high temperature sintering in sintering furnace, prepare high performance minisize mould.
The concrete steps of scheme that the present invention adopts are following:
(1) preparation cerul multicomponent binding agent; Each constituent element of binding agent constitutes and the quality percentage composition of each constituent element is: wax is paraffin, microwax, beeswax or palm wax; Account for 50 ~ 75% altogether, high molecular polymer is high density polyethylene (HDPE), polypropylene or polystyrene, accounts for 24 ~ 35wt.% altogether; Surfactant is stearic acid, titanate esters, butyl stearate or the oleic acid that contains fat, accounts for 1 ~ 15wt.% altogether.Stir each constituent element is fully mixed;
(2) high hardness material powder and binding agent are mixed on mixing roll, the heating-up temperature of mixing roll is 100 ~ 200 ℃, and processing the powder useful load is the even feeding of 40vol.% ~ 58vol.%, and promptly the high hardness material content of powder is 40vol.% ~ 58vol.%; High hardness material is carbide alloy or ceramic material, being characterized as of powder: subsphaeroidal isometric particle, particle diameter is less than 15
μM, fine and close, the inner nothing of particle cavity, surface clean;
(3) feeding is injected on injector, obtained the injection base of minisize mould;
(4) the injection base of minisize mould is immersed in carries out solvent degreasing in the organic solvent, the solvent temperature of solvent degreasing is 0 ~ 40 ℃, and degreasing time is 4 ~ 15h;
(5) the solvent degreasing base is carried out hot degreasing and presintering in thermal debinding furnace and sintering furnace; Adopt the insulation of two steps to remove binding agent residual in the solvent degreasing base down at 600 ℃; The first step is incubated 60 ~ 120min between 180 ~ 300 ℃, second step was incubated 60 ~ 120min and formulates corresponding pre-sintering temperature and temperature retention time according to different powder between 410 ~ 500 ℃.Pre-sintering temperature is 600 ℃ ~ 1000 ℃, and temperature retention time is 30-120 minute.
Ceramic material is Al in the step (2)
2O
3Or ZrO
2And Y
2O
3Mixture etc.
Step is injected feeding in (3) on injector; Punch with miniature parts shape is installed on dynamic model; The die that the base substrate that injection obtains promptly has the miniature parts shape; And this minisize mould not only can be used as the mould of micro-powder injection molding technology, also can be used as the mould of the metallurgy forming process for powder of other miniature parts such as powder compaction.
Advantage of the present invention shows:
It is good that the minisize mould of the material preparation that (1) the present invention adopted has wearability, and hardness is high, the advantage that intensity is high.
(2) the present invention adopts the method for micro-powder injection molding to prepare minisize mould, and the preparation method who compares other minisize moulds has that adaptation material is wide in variety, low-cost, high efficiency, advantage that size adaptability is good.
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The specific embodiment:
Instance 1:
(1) take by weighing each binding agent constituent element quality by quality per distribution ratio (is example with the 100g binding agent):
| Constituent element | Paraffin | High density polyethylene (HDPE) | Stearic acid |
| Quality (g) | 63 | 27 | 10 |
Three kinds of constituent elements evenly are mixed and made into binding agent;
(2) take by weighing 1000gWC-8Co cemented carbide powder and 56.68g binding agent according to powder useful load (as 54%), with powder and binding agent mixing 1h on mixing roll, the feeding that obtains mixing;
(3) feeding is injected the micro-mould injection base with miniature parts shape on injection, injection parameters is: injection pressure is 90MPa, and injection temperature is 160 ℃, and dwell pressure is 60MPa, and the dwell time is 1s, and mold temperature is 60 ℃;
(4) micro-mould is injected base and in trichloro-ethylene, carry out solution-off, skimming temp is 25 ℃, and degreasing time is 6-10h;
(5) micro-mould degreasing base is carried out hot degreasing and presintering in thermal debinding furnace, adopt N
2Be protective atmosphere, concrete technology is:
(6) the presintering base is carried out high temperature sintering in vacuum sintering furnace, vacuum is 10
-1Pa, sintering temperature is 1350-1450 ℃, sintering time is 1h.
Instance 2:
(1) take by weighing each binding agent constituent element quality by quality per distribution ratio (is example with the 100g binding agent):
| Constituent element | Paraffin | High density polyethylene (HDPE) | Stearic acid |
| Quality (g) | 60 | 30 | 10 |
Three kinds of constituent elements evenly are mixed and made into binding agent;
(2) take by weighing 500g ZrO according to powder useful load (as 46%)
2-3mol%Y
2O
3Ceramic powders and 89.29g binding agent, mixing 1.5h on mixing roll, the feeding that obtains mixing;
(3) feeding is injected the micro-mould injection base with miniature parts shape on injection, injection parameters is: injection pressure is 100MPa, and injection temperature is 150 ℃, and dwell pressure is 60MPa, and the dwell time is 1s, and mold temperature is 80 ℃;
(4) micro-mould is injected base and in trichloro-ethylene, carry out solution-off, skimming temp is 25 ℃, and degreasing time is 4h;
(5) the solution-off base is carried out hot degreasing and presintering in thermal debinding furnace, hot degreasing and sintering process are:
(6) the presintering base is carried out high temperature sintering in the tubular type sintering furnace, sintering temperature is 1350-1550 ℃, and sintering time is 1-2h.
Claims (4)
1. the method with micro-powder injection molding prepares the method for minisize mould, it is characterized in that:
(1) cerul multicomponent binding agent; Each constituent element of binding agent constitutes and the quality percentage composition of each constituent element is: wax is paraffin, microwax, beeswax or palm wax; Account for 50 ~ 75% altogether, high molecular polymer is high density polyethylene (HDPE), polypropylene or polystyrene, accounts for 24 ~ 35wt.% altogether; Surfactant is stearic acid, titanate esters, butyl stearate or the oleic acid that contains fat, accounts for 1 ~ 15wt.% altogether; Stir each constituent element is fully mixed;
(2) high hardness material powder and binding agent are mixed on mixing roll, the heating-up temperature of mixing roll is 100 ~ 200 ℃, and processing the powder useful load is the even feeding of 50vol.% ~ 58vol.%, and promptly the high hardness material content of powder is 50vol.% ~ 58vol.%; High hardness material is carbide alloy or carbide alloy or ceramic material, being characterized as of powder: subsphaeroidal isometric particle, particle diameter is less than 5
μM, fine and close, the inner nothing of particle cavity, surface clean;
(3) feeding is injected on injector, obtained the injection base of minisize mould;
(4) the injection base of minisize mould is immersed in carries out solvent degreasing in the organic solvent, the solvent temperature of solvent degreasing is 0 ~ 40 ℃, and degreasing time is 4 ~ 15h;
(5) the solvent degreasing base is carried out hot degreasing and presintering in thermal debinding furnace and sintering furnace; Adopt the insulation of two steps to remove binding agent residual in the solvent degreasing base down at 600 ℃; Formulate corresponding pre-sintering temperature and temperature retention time according to different powder; Pre-sintering temperature is 600 ℃ ~ 1000 ℃, and temperature retention time is 30-120 minute.
2. the preparation method of minisize mould according to claim 1; It is characterized in that: step is injected feeding in (3) on injector; Punch with miniature parts shape is installed on dynamic model; The die that the base substrate that obtains of injection promptly has the miniature parts shape, and this minisize mould not only can be used as the mould of micro-powder injection molding technology, also can be used as the mould of the metallurgy forming process for powder of other miniature parts such as powder compaction.
3. the preparation method of minisize mould according to claim 1; It is characterized in that: the hot degreasing process of step (5) adopts the method for two steps insulation; Be respectively: the first step is incubated 60 ~ 120min between 180 ~ 300 ℃, and second step was incubated 60 ~ 120min between 410 ~ 550 ℃.
4. the preparation method of minisize mould according to claim 1 is characterized in that: ceramic material is Al in the step (2)
2O
3Or ZrO
2And Y
2O
3Mixture.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102962455A (en) * | 2012-11-21 | 2013-03-13 | 兰州金浩机械制造有限公司 | Powder metallurgy injection molding process |
| CN103042219A (en) * | 2012-12-27 | 2013-04-17 | 华侨大学 | Titanium glasses frame molding method |
| CN104230332A (en) * | 2013-06-14 | 2014-12-24 | 佛山市南海金刚新材料有限公司 | Printing nozzle piezoelectric element and preparation method thereof |
| CN104668565A (en) * | 2015-01-04 | 2015-06-03 | 东莞劲胜精密组件股份有限公司 | Powder injection molding feedstock preparing method and powder injection molding method |
| CN107473750A (en) * | 2017-09-26 | 2017-12-15 | 深圳艾利门特科技有限公司 | It is a kind of to be used for the injection molding binding agent of zirconium oxide, feeding and the method for preparing zircite product |
| CN108558393A (en) * | 2018-01-18 | 2018-09-21 | 东莞信柏结构陶瓷股份有限公司 | Wear-resisting zirconia ceramics |
| CN109202033A (en) * | 2018-11-09 | 2019-01-15 | 黄成伟 | A kind of metal fittings and preparation method thereof based on mold machine-shaping |
| CN109550939A (en) * | 2018-12-28 | 2019-04-02 | 深圳市注成科技股份有限公司 | For the injection molding binder of digital cuttings and feeding preparation method |
| CN111872398A (en) * | 2020-08-11 | 2020-11-03 | 江苏精研科技股份有限公司 | Method for preventing product from adhering to mould in powder injection moulding |
| CN114131019A (en) * | 2021-10-25 | 2022-03-04 | 北京科技大学 | Method for preparing composite die for injection molding at low cost |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103042219A (en) * | 2012-12-27 | 2013-04-17 | 华侨大学 | Titanium glasses frame molding method |
| CN104230332A (en) * | 2013-06-14 | 2014-12-24 | 佛山市南海金刚新材料有限公司 | Printing nozzle piezoelectric element and preparation method thereof |
| CN104668565A (en) * | 2015-01-04 | 2015-06-03 | 东莞劲胜精密组件股份有限公司 | Powder injection molding feedstock preparing method and powder injection molding method |
| CN107473750A (en) * | 2017-09-26 | 2017-12-15 | 深圳艾利门特科技有限公司 | It is a kind of to be used for the injection molding binding agent of zirconium oxide, feeding and the method for preparing zircite product |
| CN108558393A (en) * | 2018-01-18 | 2018-09-21 | 东莞信柏结构陶瓷股份有限公司 | Wear-resisting zirconia ceramics |
| CN109202033A (en) * | 2018-11-09 | 2019-01-15 | 黄成伟 | A kind of metal fittings and preparation method thereof based on mold machine-shaping |
| CN109550939A (en) * | 2018-12-28 | 2019-04-02 | 深圳市注成科技股份有限公司 | For the injection molding binder of digital cuttings and feeding preparation method |
| CN111872398A (en) * | 2020-08-11 | 2020-11-03 | 江苏精研科技股份有限公司 | Method for preventing product from adhering to mould in powder injection moulding |
| CN114131019A (en) * | 2021-10-25 | 2022-03-04 | 北京科技大学 | Method for preparing composite die for injection molding at low cost |
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Application publication date: 20121010 |