CN206774389U - A kind of sintering equipment of Sintered NdFeB magnet - Google Patents
A kind of sintering equipment of Sintered NdFeB magnet Download PDFInfo
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- CN206774389U CN206774389U CN201720526674.4U CN201720526674U CN206774389U CN 206774389 U CN206774389 U CN 206774389U CN 201720526674 U CN201720526674 U CN 201720526674U CN 206774389 U CN206774389 U CN 206774389U
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Abstract
It the utility model is related to a kind of sintering equipment of Sintered NdFeB magnet, including the sintering furnace connected two-by-two, cooling system and blower system, covered with zone of heating on the inwall of sintering furnace, the support for placing product is additionally provided with inwall, air inlet pipe is installed on sintering furnace inwall, heat insulation layer is provided between the inner and outer wall of sintering furnace, the inlet end of air inlet pipe is by total pipeline through heat insulation layer outer wall and blower system in sintering furnace ft connection, air inlet pipe is set through zone of heating, the outlet side of air inlet pipe is exposed to the zone of heating, and outlet side is provided with the nozzle of both sides outlet round about, cooling gas is set circumferentially to be blown out along inwall, the outlet side of air inlet pipe and the product being placed on support are arranged at intervals, the inlet end of air inlet pipe also connects with outside cooling gas source；The utility model makes cooling gas and product directly form gas transition region, reduces the temperature difference between cooling gas and product, effectively prevent product because the phenomenon that temperature spread is larger and ftractures by changing the blowing direction of air inlet pipe.
Description
Technical field
It the utility model is related to a kind of sintering equipment, more particularly to a kind of sintering equipment of Sintered NdFeB magnet.
Background technology
In the production process of sintered NdFeB, relatively large product (more than 1kg) sintering is frequently encountered, for relatively large
Product is sintered in the phenomenon for often occurring product cracking in sintering process, and its reason is primarily due to be filled with cooling procedure
Cooling gas and product between cold and hot gap it is big, convergent force is very big when being expanded with heat and contract with cold when product is cooled, but product sheet
Experience between gravity and magazine and frictional resistance effect be present, frictional force and convergent force interaction are too big, cause magnet to ftracture.
In the prior art when to product blowing cooling gas, using blow-through mode, as shown in figure 1, being set on sintering furnace 1 '
The air inlet pipe 6 ' with blow-through nozzle is put, i.e. product and cooling gas directly does heat exchange, if in sintering temperature to product blow-through
Cooling gas, the huge temperature difference cause product to ftracture.
In order to avoid greater loss, the type of cooling allows product natural cooling using first cooling gas is not filled with, when being reduced to
After medium temperature, cooling gas air blast cooling is re-filled with, and time-consuming for natural cooling, greatly reduces the production effect of sintering equipment
Rate, and the cooling required fast quenching of neodymium iron boron, natural cooling also reduce the magnetic property of this topic while cooling velocity is reduced
Index, influence the quality of product.
Utility model content
Technical problem to be solved in the utility model is to reduce the deficiencies in the prior art, there is provided one kind can guarantee that product matter
Amount and the sintering equipment for shortening a kind of sintered NdFeB of cool time
Technical scheme is used by the utility model solves above-mentioned technical problem：A kind of sintering of Sintered NdFeB magnet
Device, including sintering furnace, cooling system and the blower system connected two-by-two, covered with zone of heating on the inwall of the sintering furnace,
The support for placing product is additionally provided with inwall, air inlet pipe, the inwall of the sintering furnace are installed on the sintering furnace inwall
Heat insulation layer is provided between outer wall, the inlet end of the air inlet pipe is being burnt by total pipeline through heat insulation layer outer wall with blower system
Freezing of a furnace ft connection, the air inlet pipe are set through zone of heating, it is characterised in that：The outlet side of the air inlet pipe is exposed to described
Zone of heating, and outlet side is provided with the nozzle of both sides outlet round about, cooling gas is circumferentially blown out along inwall, institute
The outlet side and the product being placed on support for stating air inlet pipe are arranged at intervals, and the inlet end of the air inlet pipe also cools down gas with outside
Body source connects.
Further, the zone of heating includes at least two around the circumferential molybdenum ribbon of sintering furnace inwall, described at least two
Equidistantly it is arranged at intervals between molybdenum ribbon, the outlet side of the air inlet pipe run through in every molybdenum ribbon is equally distributed.
Further, the both ends of the sintering furnace are equipped with for cooling gas to be discharged into sintering furnace and enters cooling system
Gas outlet.
Further, vacuum is less than 10 in the stove of the sintering furnace-2Pa, the inlet end pressure range of the air inlet pipe
For 100kPa~150kPa.
Further, the cooling system is the water cooling for carrying out heat exchange to the cooling gas after being heated up in sintering furnace
Mechanism.
Compared with prior art, the utility model has the advantage of：The utility model sintering equipment changes blowing for air inlet pipe
Gas direction, the direct contact product of cooling gas is avoided, air inlet pipe of the invention is blown to the circumference of sintering furnace, and cooling gas is first right
Zone of heating cools down, while cooling gas heats up, and cooling gas and product directly form gas transition region, reduce cooling gas and
Temperature difference between product, product is effectively prevent because the phenomenon that temperature spread is larger and ftractures.
Brief description of the drawings
Fig. 1 is the simple structure schematic diagram that cooling gas is acted on product in the prior art.
Fig. 2 is the structural representation of the sintering equipment of the Sintered NdFeB magnet of the utility model embodiment.
Fig. 3 be the utility model Sintered NdFeB magnet sintering equipment in sintering furnace sectional view (wind direction containing air inlet pipe
Signal).
Fig. 4 (shows for the outlet side schematic diagram of air inlet pipe in the sintering equipment of Sintered NdFeB magnet of the present invention containing wind direction
Meaning).
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing embodiment.
Embodiment 1：
As in Figure 2-4, the present embodiment provides a kind of sintering equipment of Sintered NdFeB magnet, including the burning connected two-by-two
Freezing of a furnace 1, cooling system 2 and blower system 3, include at least two rings covered with zone of heating 4, zone of heating 4 on the inwall of sintering furnace 1
Around the molybdenum ribbon of the inwall of sintering furnace 1 circumference, equidistantly it is arranged at intervals between every two molybdenum ribbon, the air inlet pipe 6 run through in every molybdenum ribbon
Outlet side be equally distributed, the support 5 for placing product is additionally provided with inwall, the inwall of sintering furnace 1 is provided with air inlet pipe
6, be heat insulation layer between the inner and outer wall of sintering furnace 1, air inlet pipe 6 set through zone of heating 4 and on zone of heating 4 equally
Distribution, the inlet end of air inlet pipe 6 run through heat insulation layer with blower system 3 in the ft connection of sintering furnace 1, air inlet pipe 6 by total pipeline
Outlet side be exposed to zone of heating 4, and outlet side is provided with the nozzle of both sides outlet round about, makes cooling gas edge
Inwall is circumferentially blown out, and the outlet side of air inlet pipe 6 and the product that is placed on support 5 are arranged at intervals, the inlet end of air inlet pipe 6 also with
Outside cooling gas source connection.
When cooling gas is filled with sintering furnace 1 from outside, cooling gas blows cold air, cooling gas and product to zone of heating 4
Between form gas transition region, cooling gas causes the cooling of gas transition region because elder generation and zone of heating 4 have carried out heat transfer
Gas heating, cooling gas and the temperature difference of product are reduced, avoiding the occurrence of cooling gas blow-through causes product and cooling gas
The temperature difference is huge and produces the phenomenon of rupture.
The fire door of sintering furnace 1 and furnace bottom both ends are equipped with gas outlet 7, air draft of the cooling gas after heating in blower system
Cooling system 2 is entered by mouth 7 of going out under effect, is cooled by the magnetism servo-electric motor water-cooling of cooling system 2, reduces the cooling after being warmed
Gas, blower system 3 is entered by the cooling gas after cooling system 2, then sintering furnace 1 is reentered by blower system 3 and used
In cooling product.
The needing before sintering of sintering furnace 1 keeps vacuum, and vacuum is less than 10 in stove-2Pa, and for cooling gas
Pressure range into air inlet pipe is 100kPa~150kPa.
Embodiment 2：
A kind of method of sintering furnace Sintered NdFeB magnet in Application Example 1, including step are as follows：
Product equipped with 5.07kg is put into magazine, then magazine is placed on support, spreads and spills between product and magazine
Alumina powder and 10 will be evacuated in sintering furnace-2Pa；
Control the zone of heating in sintering furnace to carry out first stage heating, be warming up to 250 DEG C and be incubated 2.5h, this stage is to production
Product carry out degreasing processing；
Second stage heating is controlled, is warming up to 550 DEG C, is incubated 2h, this stage is de-gassed to product and discharges waste gas；
Phase III heating is controlled, is warming up to 850 DEG C, is incubated 2.5h；
Fourth stage heating is controlled, is warming up to 1050 DEG C of sintering temperature, is incubated 6h；
Cooling gas is filled with into sintering furnace from outside by air inlet pipe, the pressure of cooling gas is 125kPa, is led to simultaneously
The gas heat exchange of supercooling system and the circulation air blast of blower system coordinate, by product cooling to 500 DEG C；
One-level tempering is carried out, is warming up to 930 DEG C；
Cooling gas is filled with again, is cooled to 500 DEG C again.
As shown in table 1, the outward appearance of used time and product of the product sintered out for embodiment 2 in cooling procedure.
Table 1：
Embodiment 3：
Product equipped with 5.07kg is put into magazine, then magazine is placed on support, spreads and spills between product and magazine
Alumina powder and 10 will be evacuated in sintering furnace-2Pa；
Control the zone of heating in sintering furnace to carry out first stage heating, be warming up to 250 DEG C and be incubated 2.5h, this stage is to production
Product carry out degreasing processing；
Second stage heating is controlled, is warming up to 550 DEG C, is incubated 2h, this stage is de-gassed to product and discharges waste gas；
Phase III heating is controlled, is warming up to 850 DEG C, is incubated 2.5h；
Fourth stage heating is controlled, is warming up to 1100 DEG C of sintering temperature, is incubated 6h；
Cooling gas is filled with into sintering furnace from outside by air inlet pipe, the pressure of cooling gas is 125kPa, is led to simultaneously
The gas heat exchange of supercooling system and the circulation air blast of blower system coordinate, by product cooling to 550 DEG C；
One-level tempering is carried out, is warming up to 930 DEG C；
Cooling gas is filled with again, is cooled to 550 DEG C again.
As shown in table 2, the outward appearance of used time and product of the product sintered out for embodiment 3 in cooling procedure.
Table 2：
Embodiment 4
Product equipped with 5.07kg is put into magazine, then magazine is placed on support, spreads and spills between product and magazine
Alumina powder and 10 will be evacuated in sintering furnace-2Pa；
Control the zone of heating in sintering furnace to carry out first stage heating, be warming up to 250 DEG C and be incubated 2.5h, this stage is to production
Product carry out degreasing processing；
Second stage heating is controlled, is warming up to 550 DEG C, is incubated 2h, this stage is de-gassed to product and discharges waste gas；
Phase III heating is controlled, is warming up to 850 DEG C, is incubated 2.5h；
Fourth stage heating is controlled, is warming up to 1070 DEG C of sintering temperature, is incubated 6h；
Cooling gas is filled with into sintering furnace from outside by air inlet pipe, the pressure of cooling gas is 125kPa, is led to simultaneously
The gas heat exchange of supercooling system and the circulation air blast of blower system coordinate, by product cooling to 550 DEG C；
One-level tempering is carried out, is warming up to 900 DEG C；
Cooling gas is filled with again, is cooled to 550 DEG C again.
As shown in table 3, the outward appearance of used time and product of the product sintered out for embodiment 4 in cooling procedure.
Table 3：
With the experimental data contrast of example IV using the data of natural cooling, required cool time is to the such as institute of table 4
Show
Table 4：
High temperature heat loss contrast is carried out to the product cooled down in natural cooling and embodiment 4, two kinds of products are processed respectively
Into direction of magnetization identical square piece, start timing after 120 DEG C of drying box inside holdings, product to insulation, toast 5h.It is cooled to
Room temperature, the magnetic property contrast of measurement magnetic flux heat loss product are as shown in table 5：
Table 5：
| Remanent magnetism Br (kGs) | Coercivity H j (kOe) | Squareness HK/Hcj | Magnetic flux lapse rate | |
| Natural cooling | 12.91-13.06 | 17.73-18.26 | 0.931-0.975 | 4.81%-7.46% |
| Embodiment 4 cools down | 12.94-13.07 | 18.03-18.65 | 0.980-0.992 | 3.57%-4.12% |
According to table 5, remanent magnetism (Br) change of magnet is little, and coercivity (Hcj) improves 0.3-0.39kOe, square
Degree (HK/Hcj) improves 0.49, and from data analysis, the cooling velocity using embodiment 4 has been accelerated, and magnet has obtained fast quenching,
Without impurities phase is separated out inside magnet, reduce unnecessary crystallization, the uniformity of magnet substantially improves.
Although the preferred embodiments of the present invention described in detail above, it is to be clearly understood that for this area
Technical staff for, the utility model can have various modifications and variations.It is all within the spirit and principles of the utility model
Any modification, equivalent substitution and improvements made etc., should be included within the scope of protection of the utility model.
Although preferred embodiment of the present utility model described in detail above, it is to be clearly understood that for this
For the technical staff in field, the utility model can have various modifications and variations.It is all in the spirit and principles of the utility model
Within any modification, equivalent substitution and improvements made etc., should be included within the scope of protection of the utility model.
Claims (5)
1. a kind of sintering equipment of Sintered NdFeB magnet, including sintering furnace (1), cooling system (2) and the air blast connected two-by-two
System (3), covered with zone of heating (4) on the inwall of the sintering furnace (1), the support for placing product is additionally provided with inwall
(5) air inlet pipe (6), is installed on sintering furnace (1) inwall, heat insulation layer is provided between the inner and outer wall of the sintering furnace,
The inlet end of the air inlet pipe (6) is connected through heat insulation layer outer wall by total pipeline with blower system (3) in sintering furnace (1) outside
Logical, the air inlet pipe (6) is set through zone of heating, it is characterised in that：The outlet side of the air inlet pipe (6) is exposed to the heating
Layer, and outlet side is provided with the nozzle of both sides outlet round about, makes cooling gas circumferentially be blown out along inwall, it is described enter
The outlet side of tracheae (6) and the product that is placed on support (5) are arranged at intervals, the inlet end of the air inlet pipe (6) also with outside
Cooling gas source connects.
A kind of 2. sintering equipment of Sintered NdFeB magnet as claimed in claim 1, it is characterised in that：The zone of heating (4)
Equidistantly it is arranged at intervals between the circumferential molybdenum ribbon of sintering furnace (1) inwall, at least two molybdenum ribbon including at least two, often
The outlet side of the air inlet pipe (6) run through in bar molybdenum ribbon is equally distributed.
A kind of 3. sintering equipment of Sintered NdFeB magnet as claimed in claim 1, it is characterised in that：The sintering furnace (1)
Both ends be equipped with for by cooling gas discharge sintering furnace and enter cooling system gas outlet (7).
A kind of 4. sintering equipment of Sintered NdFeB magnet as claimed in claim 1, it is characterised in that：The sintering furnace (1)
Stove in vacuum be less than 10-2Pa, the inlet end pressure range of the air inlet pipe is 100kPa~150kPa.
A kind of 5. sintering equipment of Sintered NdFeB magnet as claimed in claim 1, it is characterised in that：The cooling system
(2) it is for the magnetism servo-electric motor water-cooling to the cooling gas progress heat exchange after being heated up in sintering furnace (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720526674.4U CN206774389U (en) | 2017-05-11 | 2017-05-11 | A kind of sintering equipment of Sintered NdFeB magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720526674.4U CN206774389U (en) | 2017-05-11 | 2017-05-11 | A kind of sintering equipment of Sintered NdFeB magnet |
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| Publication Number | Publication Date |
|---|---|
| CN206774389U true CN206774389U (en) | 2017-12-19 |
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|---|---|---|---|
| CN201720526674.4U Active CN206774389U (en) | 2017-05-11 | 2017-05-11 | A kind of sintering equipment of Sintered NdFeB magnet |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107026004A (en) * | 2017-05-11 | 2017-08-08 | 宁波尼兰德磁业股份有限公司 | The sintering equipment and its sintering method of a kind of Sintered NdFeB magnet |
| WO2021062649A1 (en) * | 2019-09-30 | 2021-04-08 | 江西荧光磁业有限公司 | Highly efficient neodymium-iron-boron magnet sintering device |
-
2017
- 2017-05-11 CN CN201720526674.4U patent/CN206774389U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107026004A (en) * | 2017-05-11 | 2017-08-08 | 宁波尼兰德磁业股份有限公司 | The sintering equipment and its sintering method of a kind of Sintered NdFeB magnet |
| WO2021062649A1 (en) * | 2019-09-30 | 2021-04-08 | 江西荧光磁业有限公司 | Highly efficient neodymium-iron-boron magnet sintering device |
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