CN209558912U - A kind of novel sintered NdFeB graphite cover - Google Patents
A kind of novel sintered NdFeB graphite cover Download PDFInfo
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- CN209558912U CN209558912U CN201822128161.5U CN201822128161U CN209558912U CN 209558912 U CN209558912 U CN 209558912U CN 201822128161 U CN201822128161 U CN 201822128161U CN 209558912 U CN209558912 U CN 209558912U
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Abstract
A kind of improvement graphite cover that sintered NdFeB rear-earth permanent magnet sintering is used provided by the utility model, by the way of " embedded cutting ", in the upper surface of cover along the convection current direction of sintering furnace, several shallow slots are usually outputed on the length direction of cover, these slots have the function of enhancing convection current, are conducive to convective heat transfer of the furnace body in the heat radiation conduction and positive pressure cooling procedure under negative pressure state and act on；Guarantee that heat conduction is relatively more uniform while heat radiation thermal conduction time can be made to shorten in negative pressure sintering process in this way；Heat-conducting gas is set to form the channel of a rule convection current in the entirety entirely heaped in the positive pressure cooling procedure of sintering Stages of Aging, reinforce convection current conduction, enhance cooling effect while shortening cooling time, reduction is cooled to the temperature rebound phenomena after low temperature, and cooling is allowed to become more thoroughly.So as to shorten the time of entire sintering timeliness, improves labor efficiency, save production energy consumption and cost.
Description
Technical field
It uses the utility model relates to a kind of sintered NdFeB rear-earth permanent magnet manufacture course of products, is sintered for rare earth
The case of Nd-Fe-B permanent magnet sintering, more particularly to a kind of novel sintered NdFeB graphite cover.
Background technique
The manufacture of conventional sintering Nd-Fe-B magnetic material includes melting, powder processed, molding and is sintered Four processes, any
The missing of one process is all fatal to the manufacture of magnet.Therefore, sintering process is as wherein the key link, all the time
It is all one of focus of attention, even dress baking vessel used in sintering blank also is occurring constantly to improve.
In Japan, burns the tooling of sintered NdFeB blank for filling and always is metal tray using metal molybdenum as material,
Although this metal molybdenum tray has heatproof, the on-deformable good characteristics of pressure resistance, the price and manufacturing cost of metal molybdenum are same
Sample is the topic for allowing people can't steer clear of, the system of the cost performance of this tooling in the existing sintered NdFeB rear-earth permanent magnet of China
Industry is made, almost without the space of existence.It in the past in sintered NdFeB industry at home, is replaced with metallic iron tray
Molybdenum tray is burnt tool as the dress of sintered NdFeB blank and is used, although there is good cost performance, iron tray it is heated easy
Deformation with not corrosion resistance but helps flow chart to two pavings of bring shaping in industry and derusting, increases production process
Process cost.In recent years, graphite tray is because of its neutral price and be not required to the shaping and derusting of carry out process due to is in the field of business big
Amount carries out dress burning instead of iron tray.
Graphite tray used in current sintered NdFeB industry is generally made of base body and two part of cover, and cover is all
The real base of cuboid, base body cover the tightness that can improve tray after cover well, prevent backflowing for atmosphere in sintering process,
But the high density state of the tray of cuboid constantly piled up, for relying on radiation thermally conductive under high vacuum state and under gaseous state protection
Convective exchange it is cooling, generated effect is all bad.
Utility model content
The purpose of this utility model is that being relied under high vacuum state to solve the tray that existing sintered NdFeB uses
It is cooling to radiate thermally conductive and under gaseous state protection convective exchange, ineffective defect and a kind of reinforcements convection current conduction work is provided
With enhancing cooling effect while shortening cooling time, reduction is cooled to the temperature rebound phenomena after low temperature, and cooling is allowed to become
More thoroughly.So as to shorten the time of entire sintering timeliness, improves labor efficiency, save the novel sintering of production energy consumption and cost
Neodymium iron boron graphite cover.
To achieve the goals above, the utility model uses following technical scheme:
A kind of novel sintered NdFeB graphite cover, the cover ontology including cuboid, the upper end of cover ontology
Face is provided with several groove bars for running through cover ontology at equal intervals, and the groove bar on cover ontology forms convection channel.
Preferably, the direction of the groove bar is along cover ontology longitudinal direction.
Preferably, the depth of the groove bar is the half of cover body height.
Preferably, the quantity of the groove bar is 3-8 item.
A kind of improvement graphite cover that sintered NdFeB rear-earth permanent magnet sintering is used provided by the utility model, passes through
The heat conduction path for forming a convection current in cover to the cutting groove bar of cover, can make heat in negative pressure sintering process in this way
It radiates and guarantees that heat conduction is relatively more uniform while thermal conduction time shortens；In the positive pressure cooling procedure of sintering Stages of Aging
So that heat-conducting gas is formed the channel of a rule convection current in the entirety entirely heaped, reinforce convection current conduction, is cooled down shortening
Enhance cooling effect while time, reduction is cooled to the temperature rebound phenomena after low temperature, and cooling is allowed to become more thoroughly.To contract
It the time of short entire sintering timeliness, improves labor efficiency, saves production energy consumption and cost.
Technical solution of the present utility model: the graphite support lid that height is 10mm is alongst cut into depth
For the shallow slot of the 5mm of mid-height, the width of slot is designed according to the width of cover and the quantity of fluting, generally guarantee cover
With preferable bearing capacity, it is advisable with 3-8 item.By this cover along the charging heap of the one support support of flow conductance direction of sintering furnace
Collection gets up to be sintered, and due to covering the channel all cut for heat exchange in each layer of graphite support, runs through sintering furnace
Two side of left and right, play the role of good convective exchange, it is thermally conductive slow preferably to solve negative pressure heat radiation during the sintering process
Caused by uneven heating problem, improve the remanent magnetism consistency of permanent magnet；Meanwhile in the positive pressure cooling procedure of timeliness tempering,
Every layer of graphite support can be cooled down respectively for thermally conductive gas since every layer of graphite support has the presence of convection channel, and
It is not that the entirety carried out from outside to inside to the graphite support of whole heap cools down, the uniformity of cooling time and cooling all obtains biggish
Improve, so that the production efficiency and the quality of production of permanent magnet are all promoted.
In general, only just can be shortened 10%-20%/furnace on sintering time after using the graphite cover of this design
It is secondary.
The beneficial effects of the utility model are: a kind of sintered NdFeB rear-earth permanent magnet sintering provided by the utility model
Improvement graphite cover used, by the way of " embedded cutting ", in the upper surface of cover along the convection current direction of sintering furnace,
Several shallow slots are usually outputed on the length direction of cover, these slots have the function of enhancing convection current, are conducive to furnace body negative
Convective heat transfer effect in heat radiation conduction and positive pressure cooling procedure under pressure condition；It can make in negative pressure sintering process in this way
Guarantee that heat conduction is relatively more uniform while heat radiation thermal conduction time shortens；In the positive pressure cooling procedure of sintering Stages of Aging
In so that heat-conducting gas is formed the channel of a rule convection current in the entirety entirely heaped, reinforce convection current conduction, it is cold shortening
But enhance cooling effect while the time, reduction is cooled to the temperature rebound phenomena after low temperature, and cooling is allowed to become more thoroughly.To
It the time for shortening entire sintering timeliness, improves labor efficiency, saves production energy consumption and cost.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of the utility model.
In figure, 1, cover ontology；2, groove bar.
Specific embodiment
Below in conjunction with specific embodiments and the drawings, the utility model is further explained:
Embodiment 1
Referring to Fig.1, three 300mm are cut at equal intervals on 300mm × 200mm × 10mm graphite cover ontology 1
The groove bar 2 of × 30mm × 5mm covers this graphite cover in graphite support during product sinter burden, so that being placed on burning
All there is the channels that can generate exchange and convection current between each layer of graphite support on knot frame.
The sintering of general medium and small specification product is carried out using the Sintered NdFeB magnet that this graphite cover configures, it is sintered
The cooling unification of journey uses direct-cooled technique, without being segmented the mode of slow cooling i.e.: terminating in sintered heat insulating；In a timeliness
900 DEG C of heat preservations terminate and be all made of applying argon gas after 510 DEG C of heat preservations of secondary ageing and open cooling blower carry out it is direct cold
But to 60 DEG C.It, can be by former 4-6 hours of sintered heat insulating time during this conventional Sintered NdFeB magnet sintering process
Drop to 3-4 hours, and it is total to decline every heat sintering cooling time, a timeliness cooling time and secondary ageing cooling time
2-4 hours, so as to shorten the sintering process time of every heat 10%-15%.
Embodiment 2:
Cut at equal intervals on 300mm × 200mm × 10mm graphite cover ontology 1 six 300mm × 15mm ×
The groove bar 2 of 5mm covers this graphite cover in graphite support during product sinter burden, so that being placed on sintering frame
All there is the channels that can generate exchange and convection current between each layer of graphite support.
The sintering of larger product in the Sintered NdFeB magnet progress configured using this graphite cover, sintering process
Cooling technique is carried out by the way of being segmented slow cooling, it may be assumed that is naturally cooled to 750 DEG C after sintered heat insulating, is then filled
Argon gas be cooled to 510 DEG C be then turned on cooling blower carry out it is air-cooled；750 are naturally cooled to after the 900 DEG C of heat preservations of a timeliness
DEG C, then applying argon gas be cooled to 510 DEG C be then turned on cooling blower carry out it is air-cooled；Argon filling after 510 DEG C of heat preservations of secondary ageing
Gas and open cooling blower carry out it is air-cooled until in furnace product be cooled to 60 DEG C after come out of the stove.In this slow sintered NdFeB
During magnet sintering process, former 4-6 hours of sintered heat insulating time can be dropped to 3-4 hours, and decline every heat sintering
Cooling time, a timeliness cooling time and secondary ageing cooling time are 3-7 hours total, so as to shorten every heat 13%-
20% sintering process time.
Claims (4)
1. a kind of novel sintered NdFeB graphite cover, the cover ontology (1) including cuboid, which is characterized in that support
The upper surface of lid ontology (1) is provided with several groove bars (2) for running through cover ontology (1), the slot on cover ontology (1) at equal intervals
Item (2) forms convection channel.
2. the novel sintered NdFeB graphite cover of one kind according to claim 1, which is characterized in that the groove bar
(2) direction is along cover ontology (1) longitudinal direction.
3. the novel sintered NdFeB graphite cover of one kind according to claim 1, which is characterized in that the groove bar
(2) depth is the half of cover ontology (1) height.
4. the novel sintered NdFeB graphite cover of one kind according to claim 1, which is characterized in that the groove bar
(2) quantity is 3-8 item.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822128161.5U CN209558912U (en) | 2018-12-18 | 2018-12-18 | A kind of novel sintered NdFeB graphite cover |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822128161.5U CN209558912U (en) | 2018-12-18 | 2018-12-18 | A kind of novel sintered NdFeB graphite cover |
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| Publication Number | Publication Date |
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| CN209558912U true CN209558912U (en) | 2019-10-29 |
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| CN201822128161.5U Active CN209558912U (en) | 2018-12-18 | 2018-12-18 | A kind of novel sintered NdFeB graphite cover |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112884242A (en) * | 2021-03-13 | 2021-06-01 | 国网山东省电力公司泰安供电公司 | Short-process steel enterprise demand response potential analysis method and system |
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2018
- 2018-12-18 CN CN201822128161.5U patent/CN209558912U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112884242A (en) * | 2021-03-13 | 2021-06-01 | 国网山东省电力公司泰安供电公司 | Short-process steel enterprise demand response potential analysis method and system |
| CN112884242B (en) * | 2021-03-13 | 2022-09-16 | 国网山东省电力公司泰安供电公司 | Short-process steel enterprise demand response potential analysis method and system |
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