CN102554227A - Method for forming samarium cobalt blank - Google Patents
Method for forming samarium cobalt blank Download PDFInfo
- Publication number
- CN102554227A CN102554227A CN2012100262772A CN201210026277A CN102554227A CN 102554227 A CN102554227 A CN 102554227A CN 2012100262772 A CN2012100262772 A CN 2012100262772A CN 201210026277 A CN201210026277 A CN 201210026277A CN 102554227 A CN102554227 A CN 102554227A
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- blank
- smco
- rubber mold
- samarium cobalt
- forming method
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Abstract
A method for forming a samarium cobalt blank includes the steps: 1 filling prepared samarium cobalt mixed powder into a mould for rough pressing; 2 placing the roughly pressed samarium cobalt blank into a rubber mould matched with the blank in shape and size; 3 completely wrapping the rubber mould with a preservative film and then placing the rubber mould into a bag; 4 vacuumizing and sealing the bag in the step 3 to obtain the sealed and packaged roughly pressed samarium cobalt blank; 5 placing the sealed and packaged roughly pressed samarium cobalt blank in the step 4 into a cold isostatic press for cold isostatic pressing at the pressure of 100-300MPa in the holding time of 4-12 minutes; and 6 taking out the sealed and packaged roughly pressed samarium cobalt blank after cold isostatic pressing, unpacking the bag and the preservative film and then taking out the samarium cobalt blank from the rubber mould. The method has the advantages that the samarium cobalt blank is not easy to break or have oil stains, the yield of the samarium cobalt blank is high, resource waste is decreased, and manufacturing cost is low.
Description
The method field
The invention belongs to field of powder metallurgy, particularly a kind of forming method of SmCo blank.
Background method
Rare earth permanent-magnetic material is meant that the alloy that rare earth metal and magnesium-yttrium-transition metal form processes permanent-magnet material through certain process; Owing to have higher magnetic energy product; Characteristics such as stable magnetic and favorable mechanical performance, fields such as instrument in machinery and medical treatment are widely used.Up to now, be called the 2:17 type samarium-cobalt permanent-magnetic material of second generation permanent-magnet material in the rare earth permanent-magnetic material of prior art such as the industry, its Curie temperature reaches more than 800 ℃, the highest occasion that can be applicable to 400 ~ 500 ℃, and temperature coefficient is little.Magnetic property is reliable and stable, and therefore, in the high-technology fields such as information industry of fast development, the range of application of samarium-cobalt permanent-magnetic material is still in continuous expansion.
The SmCo blank must be through the cold isostatic press compacting, because in the isostatic cool pressing process in the compression moulding process; The medium that needs to use is extraordinary hydraulic oil, and this oily matter is very big to the influence of SmCo performance of products, so before isostatic cool pressing, need pack processing to the SmCo blank; Prevent that the SmCo blank from touching hydraulic oil in the isostatic cool pressing process, after isostatic cool pressing finishes, again with the taking-up from pack of SmCo blank; But in the SmCo blank forming process of prior art, when packing, just through outside the SmCo blank that slightly is pressed into, coating one deck packaging bag and sealing; There is very easily breakage and in the isostatic cool pressing journey, pack because of there is air inside; Make the fracture of SmCo blank or be infected with greasy dirt, this just makes that the scrappage of SmCo blank is higher, causes a large amount of wastes of the resources such as labour, time and electric power in material and the process; And then cause manufacturing cost also corresponding higher; This causes very big economic loss to enterprise, and order form delivery time is longer, has directly influenced the market competitiveness of enterprise.
Summary of the invention
The present invention is directed to above problem provide a kind of in manufacture process not easy fracture with catch greasy dirt, make that SmCo blank yield rate is higher, reduce the forming method of the lower SmCo blank of the wasting of resources and manufacturing cost.
The present invention overcomes the above problems used technical scheme: a kind of forming method of SmCo blank may further comprise the steps:
1) the SmCo mixed-powder for preparing is packed into slightly molded in the mould;
2) in the rubber mold that the geomery of will thick molded SmCo blank packing into matches;
3) with preservative film rubber mold is wrapped fully subsequently, reinstall in the sack;
4) sack in the step 3) is vacuumized and seals, obtain sealed and packed thick molded SmCo blank;
5) thick molded SmCo blank sealed and packed in the step 4) is put into cold isostatic press and carry out the isostatic cool pressing processing, pressure is 100 ~ 300MPa, and the dwell time is 4 ~ 12 minutes;
6) isostatic cool pressing finishes the back taking-up, and takes sack and preservative film apart, takes out the SmCo blank from rubber mold again and gets final product.
The density of thick molded SmCo blank is 3.8 ~ 4.8g/cm in the described step 1)
3
Pressure in the described step 5) is 150 ~ 280MPa, and the dwell time is 5 ~ 10 minutes.
After adopting above method, the present invention compared with prior art packs after in the rubber mold that thick molded SmCo blank is packed into again; Then in the isostatic cool pressing process, even pack breakage, under the effect of preservative film and rubber mold; The SmCo blank also is difficult for catching greasy dirt; And rubber mold has the effect of buffering to the SmCo blank, so in the isostatic cool pressing process, the SmCo blank is not prone to the situation of fracture; Make that the yield rate of SmCo blank is higher, this has just been avoided the waste of the resources such as labour, time and electric power in raw material and the process; After simultaneously sack being vacuumized, can make in follow-up isostatic cool pressing process, save the vent sequence that original needs carry out, promptly shorten the isostatic cool pressing processing time, production efficiency is higher, and manufacturing cost is also just lower.Therefore the present invention has in manufacture process not easy fracture and catches greasy dirt, makes that SmCo blank yield rate is higher, reduces the wasting of resources and the lower characteristics of manufacturing cost.
As improvement, in the described step 3) before preservative film parcel earlier at rubber mold outerwrap last layer blotting paper, then be provided with one deck blotting paper after; In the isostatic cool pressing process; Breakage all occurs even pack with preservative film, blotting paper also can adsorb permeate the hydraulic oil of coming in from breakage, prevents that hydraulic oil from getting into rubber mold and polluting the SmCo blank; Yield rate is higher in process of production so can make the SmCo blank, further reduces production costs.
As further improvement, described sack is a polybag, and polybag is commodity common on the market, so cost is lower; And polybag is sealing easily also, also has ductility preferably, not cracky; Sealing is better, and then makes the SmCo blank be difficult for catching greasy dirt, guarantees the yield rate of SmCo blank.
As further improving, being meant from rubber mold taking-up SmCo blank in the described step 6) tips upside down on the magazine that is used for holding the SmCo blank with rubber mold earlier, pats rubber mold subsequently, makes the SmCo blank fall into magazine and gets final product again.
The specific embodiment
Below in conjunction with concrete real mode, the present invention done further describe (cylindrical with φ 5 is example).
Embodiment 1
A kind of forming method of SmCo blank may further comprise the steps:
1) the SmCo mixed-powder for preparing is packed into slightly molded in the mould;
2) in the rubber mold that the geomery of will thick molded SmCo blank packing into matches;
3) with preservative film rubber mold is wrapped fully subsequently, reinstall in the sack;
4) sack in the step 3) is vacuumized and seals, obtain sealed and packed thick molded SmCo blank;
5) thick molded SmCo blank sealed and packed in the step 4) is put into cold isostatic press and carry out the isostatic cool pressing processing, pressure is that pressure is 150MPa, and the dwell time is 10 minutes;
6) isostatic cool pressing finishes the back taking-up, and takes sack and preservative film apart, takes out the SmCo blank from rubber mold again and gets final product.
The density of thick molded SmCo blank is 3.8g/cm in the described step 1)
3
Described sack is a polybag, is specially commercially available vacuum bag.
Being meant from rubber mold taking-up SmCo blank in the described step 6) tips upside down on the magazine that is used for holding the SmCo blank with rubber mold earlier, pats rubber mold subsequently, makes the SmCo blank fall into magazine and gets final product.
Related equipment is the conventional equipment of prior art in the above-mentioned steps, and polybag, rubber mold and preservative film are the conventional commodity of selling on the market.
Embodiment 2
A kind of forming method of SmCo blank may further comprise the steps:
1) the SmCo mixed-powder for preparing is packed into slightly molded in the mould;
2) in the rubber mold that the geomery of will thick molded SmCo blank packing into matches;
3) with preservative film rubber mold is wrapped fully subsequently, reinstall in the sack;
4) sack in the step 3) is vacuumized and seals, obtain sealed and packed thick molded SmCo blank;
5) thick molded SmCo blank sealed and packed in the step 4) is put into cold isostatic press and carry out the isostatic cool pressing processing, pressure is 250MPa, and the dwell time is 5 minutes;
6) isostatic cool pressing finishes the back taking-up, and takes sack and preservative film apart, takes out the SmCo blank from rubber mold again and gets final product.
The density of thick molded SmCo blank is 4.0g/cm in the described step 1)
3
Elder generation is at rubber mold outerwrap last layer blotting paper before the preservative film parcel in the described step 3), and blotting paper is commercially available conventional blotting paper.
Described sack is a polybag.
Being meant from rubber mold taking-up SmCo blank in the described step 6) tips upside down on the magazine that is used for holding the SmCo blank with rubber mold earlier, pats rubber mold subsequently, makes the SmCo blank fall into magazine and gets final product.
Embodiment 3
A kind of forming method of SmCo blank may further comprise the steps:
1) the SmCo mixed-powder for preparing is packed into slightly molded in the mould;
2) in the rubber mold that the geomery of will thick molded SmCo blank packing into matches;
3) subsequently earlier at rubber mold outerwrap last layer oil-Absorbing Sheets, oil-Absorbing Sheets are the oil-Absorbing Sheets of commercially available routine, with preservative film rubber mold are wrapped fully, in the sack of packing at last again;
4) sack in the step 3) is vacuumized and seals, obtain sealed and packed thick molded SmCo blank;
5) thick molded SmCo blank sealed and packed in the step 4) is put into cold isostatic press and carry out the isostatic cool pressing processing, pressure is 280MPa, and the dwell time is 8 minutes;
6) isostatic cool pressing finishes the back taking-up, and takes sack and preservative film apart, takes out the SmCo blank from rubber mold again and gets final product.
The density of thick molded SmCo blank is 4.5g/cm in the described step 1)
3
Described sack is a kraft paper bag.
Being meant from rubber mold taking-up SmCo blank in the described step 6) tips upside down on the magazine that is used for holding the SmCo blank with rubber mold earlier, pats rubber mold subsequently, makes the SmCo blank fall into magazine and gets final product.
Adopt the production method of prior art, each workman per hour can pack 800 cylindrical SmCo blanks, the packing of perhaps removing 1000 cylindrical SmCo blanks, and the product of its cleaved and oil-feed reaches 450 ~ 500, and the product first-time qualification rate only has 50%; And adopt method of the present invention; Each workman per hour can pack 1400 cylindrical SmCo blanks, the packing of perhaps removing 1800 cylindrical SmCo blanks, and the product of its cleaved and oil-feed is 50 ~ 100; The product first-time qualification rate is 92 ~ 97%, and production efficiency improves nearly one times simultaneously.
Above embodiment is merely preferred embodiment of the present invention; The present invention is not limited only to above embodiment and also allows other structural change; As: sack is rubber bag, combined package bag and Lilezhen etc., allly in rights to independence claimed range of the present invention, changes, and all belongs to protection domain of the present invention.
Claims (6)
1. the forming method of a SmCo blank is characterized in that: may further comprise the steps:
1) the SmCo mixed-powder for preparing is packed into slightly molded in the mould;
2) in the rubber mold that the geomery of will thick molded SmCo blank packing into matches;
3) with preservative film rubber mold is wrapped fully subsequently, reinstall in the sack;
4) sack in the step 3) is vacuumized and seals, obtain sealed and packed thick molded SmCo blank;
5) thick molded SmCo blank sealed and packed in the step 4) is put into cold isostatic press and carry out the isostatic cool pressing processing, pressure is 100 ~ 300MPa, and the dwell time is 4 ~ 12 minutes;
6) isostatic cool pressing finishes the back taking-up, and takes sack and preservative film apart, from rubber mold, takes out the SmCo blank again and gets final product.
2. the forming method of SmCo blank according to claim 1 is characterized in that: the density of thick molded SmCo blank is 3.8 ~ 4.8g/cm in the described step 1)
3
3. the forming method of SmCo blank according to claim 1 is characterized in that: wrap up before earlier at rubber mold outerwrap last layer blotting paper at preservative film in the described step 3).
4. the forming method of SmCo blank according to claim 1 is characterized in that: described sack is a polybag.
5. the forming method of SmCo blank according to claim 1 is characterized in that: the pressure in the described step 5) is 150 ~ 280MPa, and the dwell time is 5 ~ 10 minutes.
6. the forming method of SmCo blank according to claim 1; It is characterized in that: being meant in the described step 6) from rubber mold taking-up SmCo blank; Earlier rubber mold is tipped upside down on the magazine that is used for holding the SmCo blank; Pat rubber mold subsequently, make the SmCo blank fall into magazine and get final product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100262772A CN102554227A (en) | 2012-02-07 | 2012-02-07 | Method for forming samarium cobalt blank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100262772A CN102554227A (en) | 2012-02-07 | 2012-02-07 | Method for forming samarium cobalt blank |
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| Publication Number | Publication Date |
|---|---|
| CN102554227A true CN102554227A (en) | 2012-07-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100262772A Pending CN102554227A (en) | 2012-02-07 | 2012-02-07 | Method for forming samarium cobalt blank |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103406072A (en) * | 2013-08-28 | 2013-11-27 | 郑州中南杰特超硬材料有限公司 | Hexagonal boron nitride powder column molding process and rubber mold used therein |
| CN106513668A (en) * | 2016-11-10 | 2017-03-22 | 浙江恒成硬质合金有限公司 | Hard alloy plate manufacturing method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0293004A (en) * | 1988-09-29 | 1990-04-03 | Komatsu Ltd | Method for forming powder material |
| JPH06116606A (en) * | 1992-10-05 | 1994-04-26 | Tdk Corp | Isostatic pressing machine provided with magnetic field generator |
| CN201020536Y (en) * | 2007-04-29 | 2008-02-13 | 西北有色金属研究院 | Jacket for cold isostatic moulding in powder metallurgy |
| CN101850421A (en) * | 2010-06-23 | 2010-10-06 | 宁波永久磁业有限公司 | Molding device for NdFeB materials |
| CN201644791U (en) * | 2010-04-14 | 2010-11-24 | 俞红霞 | Sintered NdFeB isostatic-pressing mold |
-
2012
- 2012-02-07 CN CN2012100262772A patent/CN102554227A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0293004A (en) * | 1988-09-29 | 1990-04-03 | Komatsu Ltd | Method for forming powder material |
| JPH06116606A (en) * | 1992-10-05 | 1994-04-26 | Tdk Corp | Isostatic pressing machine provided with magnetic field generator |
| CN201020536Y (en) * | 2007-04-29 | 2008-02-13 | 西北有色金属研究院 | Jacket for cold isostatic moulding in powder metallurgy |
| CN201644791U (en) * | 2010-04-14 | 2010-11-24 | 俞红霞 | Sintered NdFeB isostatic-pressing mold |
| CN101850421A (en) * | 2010-06-23 | 2010-10-06 | 宁波永久磁业有限公司 | Molding device for NdFeB materials |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103406072A (en) * | 2013-08-28 | 2013-11-27 | 郑州中南杰特超硬材料有限公司 | Hexagonal boron nitride powder column molding process and rubber mold used therein |
| CN103406072B (en) * | 2013-08-28 | 2015-10-07 | 郑州中南杰特超硬材料有限公司 | Hexagonal boron nitride powder post moulding process and rubber mold used |
| CN106513668A (en) * | 2016-11-10 | 2017-03-22 | 浙江恒成硬质合金有限公司 | Hard alloy plate manufacturing method |
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Application publication date: 20120711 |