CN1261629A - Production method and equipment of Nd-Fe-B rare earth permanent magnetic mother alloy - Google Patents
Production method and equipment of Nd-Fe-B rare earth permanent magnetic mother alloy Download PDFInfo
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- CN1261629A CN1261629A CN 99112628 CN99112628A CN1261629A CN 1261629 A CN1261629 A CN 1261629A CN 99112628 CN99112628 CN 99112628 CN 99112628 A CN99112628 A CN 99112628A CN 1261629 A CN1261629 A CN 1261629A
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Abstract
The present invention features that during the molten alloy is poured from crucible into water cooled casting die via of funnel, the molten alloy together with the casting die reciprocates to form elongated crystal. The water cooled casting die is connected via a pull rod to a power source outside the furnace, so that it can reciprocate horizontally in the action of the pull rod. The present invention aims at lowering the temperature of molten alloy fast to form perfect elongated crystal and preventing the die from becoming damaged.
Description
The invention belongs to the technology of preparing of permanent magnet alloy, particularly relate to melting technology and the production unit thereof of producing the Nd-Fe-B rare-earth permanent magnet mother alloy.
The nd-fe-b permanent magnetic alloy material is owing to excellent performance, be widely used, and obtains the development of advancing by leaps and bounds in recent years, is the performance that further improves alloy material, improves product percent of pass, and alloy melting is the crucial the first step.Produce in the fusion process of Nd-Fe-B permanent magnetic mother alloy at present both at home and abroad, there is following shortcoming: 1, in alloy liquation casting cycle, because the temperature of alloy liquation can not very fast reduction, the bottom advantages of good crystallization of cooling back ingot casting, centre and top crystallization are poor, the upper surface oxide side is big, can not form column crystal well, has influenced the magnetic property of rare earth permanent magnet greatly; 2, behind alloy melting, liquation is poured in the process of junker mold,, junker mold is watered wear easily because the alloy melt temperature is higher.
At problem set forth above, the invention provides a kind of improved production technique and production unit thereof, its objective is that overcoming the alloy liquation can not form column crystal well, waters the existing problem of junker mold of wearing easily.
The present invention is achieved through the following technical solutions:
The production method of preparation Nd-Fe-B rare-earth permanent magnet mother alloy, comprising the packing into of alloy raw material, vacuumize, the melting of alloy, casting, cooling, the demoulding, it is characterized in that: crucible overturns behind alloy melting, the alloy liquation is poured in the process of junker mold by funnel, with the reciprocally casting in junker mold of alloy liquation, make ingot casting form column crystal.
Move back and forth in the horizontal direction by junker mold and to realize that the alloy liquation reciprocally casts, also can make the reciprocally casting in junker mold of alloy liquation, make ingot casting form column crystal by removable hopper.
The production unit of preparation Nd-Fe-B rare-earth permanent magnet mother alloy, it is in the vacuum induction furnace of band water-cooled in the middle of double-deck, include crucible, inductor block, funnel and junker mold, it is characterized in that: junker mold is connected by a pull bar propulsion source outer with being arranged on body of heater, drives junker mold and moves back and forth in the horizontal direction.
Aforesaid propulsion source can be that motor connects with a leading screw by speed reduction unit, and leading screw drives junker mold by pull bar and moves.
On the furnace wall of vertical vacuum induction furnace, be provided with a closing door.
Use Technology of the present invention and production unit thereof, the ingot casting oxidation of being produced is few, easy to operate, the productivity height.Ingot casting forms the very thin column crystal of crystal grain, and the finished product that processes like this has good magnetic property, and simultaneously, mobile casting is difficult for watering wears mold, the work-ing life of improving equipment.On the other hand, on the furnace wall of vacuum induction furnace, have closing door, when getting material, mold is pulled to outside the stove, outside stove, ingot casting is taken out from mold, easy to operate like this, be easy to take out ingot casting, alleviated labour intensity widely.
Accompanying drawing 1 is the structural representation of production unit of the present invention.
The present invention is specifically described by embodiment below in conjunction with accompanying drawing:
In production process before, the alloy liquation casts on the junker mold 8 by funnel 4.Though reduce the temperature of alloy liquation in the junker mold 8 by the circulation of water coolant, refrigerative speed is not enough, be difficult for forming column crystal, reduce the magnetic property of finished product, and easily water and wear mold.The present invention is that the alloy liquation is poured into by funnel 4 in the process of junker mold 8 by upset crucible 3 behind alloy melting, with the reciprocally casting in junker mold 8 of alloy liquation, reaches the purpose of fast cooling, makes ingot casting form the very thin column crystal of crystal grain.The method that the alloy liquation is back and forth cast in junker mold 8, can be to move back and forth in the horizontal direction by junker mold 8 to realize that the alloy liquation reciprocally casts, also can be to make the reciprocally casting in junker mold 8 of alloy liquation, make ingot casting form column crystal by removable hopper 4.Ingot casting is moved to outside the stove together with mold, carries out the demoulding then, takes out ingot casting.
The equipment that the present invention is used, be in the vacuum induction furnace 1 of existing double-deck middle band water-cooled, include crucible 3, inductor block 2, funnel 4 and junker mold 8, it is characterized in that junker mold 8 is connected by a pull bar 6 propulsion source outer with being arranged on body of heater, junker mold 8 moves back and forth under the effect of pull bar 6 in the horizontal direction.Propulsion source can be that motor connects with a leading screw 7 by speed reduction unit, and leading screw 7 connects with junker mold 8 by pull bar 6, drives junker mold 8 and move back and forth in the process of alloy liquation casting; Also can connect with junker mold 8 by other transmission rigs such as cylinders, it is reciprocating to drive junker mold 8.
On the furnace wall of vertical vacuum induction furnace 1, be provided with a closing door 5.When one pot of melting finishes, closing door 5 is opened, and dolly 9 is taken mold out of together to stove, outside stove ingot casting is taken out from mold, and is easy to operate, reduces labour intensity widely.
Claims (5)
1, a kind of production method for preparing the Nd-Fe-B rare-earth permanent magnet mother alloy, comprising the packing into of alloy raw material, vacuumize, the melting of alloy, casting, cooling, the demoulding, it is characterized in that: the crucible that behind alloy melting, overturns (3), the alloy liquation is poured in the process of junker mold (8) by funnel (4), with the reciprocally casting in junker mold (8) of alloy liquation, make ingot casting form column crystal.
2, the production method of preparation Nd-Fe-B rare-earth permanent magnet mother alloy according to claim 1, it is characterized in that: can move back and forth in the horizontal direction by junker mold (8) and realize that the alloy liquation reciprocally casts, also can make the reciprocally casting in junker mold of alloy liquation, make ingot casting form column crystal by removable hopper (4).
3, a kind of production unit for preparing the Nd-Fe-B rare-earth permanent magnet mother alloy, it is in the vacuum induction furnace (1) of band water-cooled in the middle of double-deck, include crucible (3), inductor block (2), funnel (4) and junker mold (8), it is characterized in that: junker mold (8) is connected by a pull bar (a 6) propulsion source outer with being arranged on body of heater, drives junker mold (8) and moves back and forth in the horizontal direction.
4, the production unit of preparation Nd-Fe-B rare-earth permanent magnet mother alloy according to claim 3, it is characterized in that: aforesaid propulsion source can be that motor connects with a leading screw (7) by speed reduction unit, and leading screw (7) drives junker mold (8) by pull bar (6) and moves.
5, the production unit of preparation Nd-Fe-B rare-earth permanent magnet mother alloy according to claim 3 is characterized in that: on the furnace wall of vertical vacuum induction furnace, be provided with a closing door (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99112628 CN1261629A (en) | 1999-01-18 | 1999-01-18 | Production method and equipment of Nd-Fe-B rare earth permanent magnetic mother alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99112628 CN1261629A (en) | 1999-01-18 | 1999-01-18 | Production method and equipment of Nd-Fe-B rare earth permanent magnetic mother alloy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1261629A true CN1261629A (en) | 2000-08-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99112628 Pending CN1261629A (en) | 1999-01-18 | 1999-01-18 | Production method and equipment of Nd-Fe-B rare earth permanent magnetic mother alloy |
Country Status (1)
| Country | Link |
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| CN (1) | CN1261629A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109719278A (en) * | 2019-03-20 | 2019-05-07 | 沈阳真空技术研究所有限公司 | Agitating type vacuum fine grain foundry furnace and its application method |
| CN111230077A (en) * | 2020-03-09 | 2020-06-05 | 西北工业大学 | Wide speed-regulating directional solidification device for high-temperature alloy |
-
1999
- 1999-01-18 CN CN 99112628 patent/CN1261629A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109719278A (en) * | 2019-03-20 | 2019-05-07 | 沈阳真空技术研究所有限公司 | Agitating type vacuum fine grain foundry furnace and its application method |
| CN111230077A (en) * | 2020-03-09 | 2020-06-05 | 西北工业大学 | Wide speed-regulating directional solidification device for high-temperature alloy |
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