CN203478929U - Vacuum sintering furnace for samarium-cobalt permanent magnet - Google Patents
Vacuum sintering furnace for samarium-cobalt permanent magnet Download PDFInfo
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- CN203478929U CN203478929U CN201320469471.8U CN201320469471U CN203478929U CN 203478929 U CN203478929 U CN 203478929U CN 201320469471 U CN201320469471 U CN 201320469471U CN 203478929 U CN203478929 U CN 203478929U
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- vacuum
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- permanent magnet
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Abstract
A vacuum sintering furnace for samarium-cobalt permanent magnets comprises a vacuumizing system, a furnace body, a graphite electrical heater, a temperature control device, an air blower cooling coil, and a PLC program control system, wherein the vacuumizing system forms an adjustable and controllable vacuum system through a first lobe pump, a second lobe pump, a slide valve pump and a vacuumizing pipeline; the furnace body comprises a sealing furnace chamber formed by a thermal-insulating and heat preservation layer, a front door sealing gasket and a back door sealing gasket; a plurality of graphite heating frame plates uniformly distributed are arranged in the sealing furnace chamber; a plurality of thermocouples for detecting the temperature of the sealing furnace chamber are uniformly arranged among the graphite heating frame plates; the air blower cooling coil is arranged at the rear end of the sealing furnace chamber; the vacuumizing pipeline is arranged between one side of the sealing furnace chamber and the air blower cooling coil. According to the utility model, different vacuum degrees can be selected for the vacuumizing system, the graphite heating frame plates uniformly arranged in the sealing furnace chamber and the thermocouples for detecting the temperature are used for monitoring the temperature in the furnace, so that a high-temperature sintering area can be formed, and the stable temperature and vacuum degree can be achieved; the permanent magnet product quality is improved, the production benefit of the sintering furnace is improved, the qualification rate of the product is improved by 30%, the production efficiency is improved by multiple times, and the total energy is reduced by 60% above.
Description
Technical field
The utility model relates to a kind of production equipment of samarium-cobalt permanent-magnetic material, particularly a kind of rare earth permanent magnet samarium-cobalt permanent-magnetic material vacuum sintering furnace.
Background technology
Sintering furnace is one of visual plant of preparing samarium-cobalt permanent-magnetic material, and the pressed compact of samarium-cobalt permanent-magnetic material obtains required performance through high temperature sintering.Vacuum-sintering has high requirement to vacuum and temperature stability, therefore, in the process of sinter molding, in order to prevent that material is oxidized, reduce product quality, so the production technology of conventional vacuum-sintering moulding in the production process of samarium-cobalt permanent-magnetic material, vacuum sintering technology is before sintering, the oxygen in sintering equipment to be discharged by vavuum pump, and then carries out sintering, in sintering process, need to continue to start vavuum pump, to keep the vacuum in sintering furnace.And sintering temperature has directly determined the last magnetic property of samarium cobalt permanent magnet body, temperature drift causes permanent magnet pieces to burn out, temperature is on the low side density do not arrive, make samarium cobalt permanent magnet body magnetic property not reach requirement, so the height of temperature and uniformity all will cause the quality of magnetic property.Partially sinter at present stove and adopt microwave heating, the heat discontinuity that microwave applicator produces, can not carry out inhomogeneity heating, and thermo-lag situation is obvious.Make the interior regional temperature difference of stove larger, cause the magnetic property gap of whole stove product too obvious, make final products not reach production requirement.Many defects such as partially sintering stove is the tube furnace that adopts external-heat, exists and yields poorly, and energy consumption is large, and warm area is unstable.In sintering cooling stage, normal employing to passing in stove passes into cooling water in a large amount of argon gas and water jacket and reduces furnace temperature, but the poor radiation of this mode, furnace temperature decrease speed is slow, and the production cycle is long.For the sintering circuit of samarium-cobalt permanent-magnetic material, there is many defects that affects product quality in existing vacuum sintering furnace.
Summary of the invention
Problem to be solved in the utility model is to provide the interior vacuum of the lasting maintenance of a kind of energy stove and temperature homogeneity is good, accelerate the cooling vacuum sintering furnace of furnace temperature.
The technical solution adopted in the utility model is: samarium cobalt permanent magnet body vacuum sintering furnace, it comprises pumped vacuum systems, body of heater, graphite electric heater, attemperating unit, blower fan cooling coil and PLC program control system, it is characterized in that pumped vacuum systems is by first, the second lobe pump, slide valve pump and vacuum-pumping pipeline form can regulate and control vacuum system, the sealing burner hearth that body of heater is comprised of insulating and front, rear door seal, in sealing burner hearth, establish some equally distributed heating graphite deckle boards, the thermocouple of some detection Sealing furnace bore temperatures is evenly set between heating graphite deckle board, blower fan cooling coil is established in sealing burner hearth rear end, vacuum-pumping pipeline is located between sealing burner hearth one side and blower fan cooling coil.
Described pumped vacuum systems also comprises machine early gate and is located at the venting valve between machine early gate and slide valve pump.
Described heating graphite deckle board forms a heat generating body unit by two rectangle frames that are parallel to each other, and two heat generating body units connect a power electrode.
Described blower fan cooling coil comprises the fan electromotor being located at outside sealing burner hearth cavity rear end, and the cooling water pipe joining with the cool-heat-exchanger of sealing burner hearth rear end.
Described insulating is comprised of molybdenum sheet inner casing, middle stuffed heat insulated heat-preservation cotton and shell corrosion resistant plate.
The beneficial effect of above-mentioned design is: by two Vacuum Roots pumps and vacuum slide valve pump, formed and can be selected respectively and control to sintering furnace pumped vacuum systems the different vacuum requirements that different vacuum reaches sintering furnace.In stove, establish sealing burner hearth and front and back sealing gasket, at sintering, during the stage, with front and back sealing gasket, clamp sealing burner hearth, some heating graphite deckle boards that are evenly arranged in sealing burner hearth, form high temperature sintering district and stable temperature and vacuum.Evenly be arranged on temperature in the temperature thermocouple monitoring stove in heating graphite deckle board, control temperature in stove, make the interior temperature of sintering furnace even, the blower fan cooling coil that is located at sintering furnace rear end forces furnace temperature fast cooling cooling, shorten sintering furnace temperature fall time, improve sintering furnace turnover rate, the improvement design of above-mentioned four aspects further improves sintering furnace technical performance, form high vacuum, high heat, constant temperature sintering process, both improved permanent magnet product quality, improve again sintering furnace productivity effect, product percent of pass improves 30%, production efficiency significantly improves, per kilogram permanent magnet sintering power consumption drops to 8.2 degree from 24.5 degree, total energy is saved more than 60%.
Accompanying drawing explanation
Fig. 1 is the whole top view that forms of the utility model.
Fig. 2 is A-A cutaway view of Fig. 1.
Fig. 3 is B-B cutaway view of Fig. 1.
Fig. 4 is graphite electric heater top view.
The specific embodiment
Below in conjunction with drawings and Examples, the utility model is elaborated.
Shown in Fig. 1, permanent magnet vacuum sintering furnace, comprises body of heater 1, graphite electric heater 2, attemperating unit 3, blower fan cooling coil 4, pumped vacuum systems 5 and program control system 6.
Shown in Fig. 2～Fig. 4, in body of heater 1, establish sintering furnace and cool-heat-exchanger, sintering body of heater forms sealing burner hearth 10, front door seal 11 and rear door seal 17 by insulating, opens or closes sealing burner hearth 10 respectively by front door cylinder 13 and 15 actions of rear door cylinder.
Insulating is comprised of molybdenum sheet inner casing, middle stuffed heat insulated heat-preservation cotton and stainless steel casing.Sealing burner hearth 10 is fixed by insulating steady pin 14 and inboard wall of furnace body, and sintering shelf 19 is located in sealing burner hearth, by shelf pin 18, through insulating, is fixed on body of heater inner bottom part.
Graphite electric heater 2 is comprised of with the parallel some heating graphite deckle boards 22 of cloth in sealing burner hearth 10 of establishing the graphite electrode 21 being located in body of heater 1, heating graphite deckle board 22 forms a heat-generating units by two rectangle frames that are parallel to each other, two heat-generating units connect a power electrode 21, some heating graphite deckle boards 22 that are evenly arranged in sealing burner hearth 10 form high temperature sintering district, it is high that heating graphite deckle board 22 produces heat, and graphite cake heat resistance is strong, thermal expansion is little, and heat is transmitted evenly, long service life.As shown in Figure 4, the power electrode 21 of power supply connects respectively the three phase mains 20 outside body of heater.Three phase mains 20 voltage 40V～60V, electric current is 700～800A, makes not produce spark discharge in body of heater, power supply is stable, heating is even and save energy consumption.Heating graphite deckle board 22 is designed to square, rectangle, circle or oval frame according to burner hearth 10 cavity shapes, and heating graphite can be tabular, bar-shaped or banded.
Attemperating unit 3 is comprised of the PLC controller 6 that is located at the interior thermocouple 31,32,33 of body of heater 1 and be located at outside body of heater 1, the temperature-sensitive head of three thermocouples is located at respectively front end, centre and the rear end of annular seal space 10, monitor respectively the furnace temperature of three sections, thermocouple setting is not limited to three, according to heating system and accuracy of temperature control, need to arrange 3～5, can be controlled at ± change between 1 ℃, guarantee that sintering temperature is stable.
Blower fan cooling coil 4 comprises the motor 41 that is located at body of heater 1 rear end, fan 42, cool-heat-exchanger 43 and and cooling water pipe, motor 41 is taken away heat by the recirculated water of cool-heat-exchanger 43 to being filled with argon gas in body of heater simultaneously, and sintering burner hearth is lowered the temperature rapidly.
Pumped vacuum systems 5(is referring to shown in Fig. 1) by two lobe pumps 51 and 52, a machine early gate 53 and a slide valve pump 50 form, between machine early gate 53 and slide valve pump 50, be provided with mechanical pump venting valve 54, enter vacuum lead 55 and the safety valve 56 of body of heater 1, lobe pump composition vacuum pumping pump group by two different capacities carries out selectively can controlling vacuumizing of vacuum to body of heater 1, can require select to control according to different vacuum.
Program control system 6 comprises PLC program board, with holding wire and each interface circuit of graphite electric heater 2, temperature thermocouple 3, Fan Cooling System 4 and pumped vacuum systems 5.
When sintering starts, first the magazine that pressed compact is housed is pushed in body of heater 1, magazine is accurately placed on the shelf 19 of sealing burner hearth 10,51,52 pairs of equipment of Vacuum Roots pump by two kinds of different capacities selectively vacuumize, make to reach in sintering burner hearth while producing needed vacuum, to guarantee that blank can be under vacuum state when the sintering.When vacuum reaches 1.0 * 10
-1during Pa, start to enter the low temperature presintering stage, to the heat treated of switching on of blank in stove, get rid of some residual moisture and gasoline, 51,52 and slide valve pumps 50 of Vacuum Roots pump of two series connection can in the short period of time, be taken waste gas away fast.When temperature arrives 400 ℃～600 ℃ of left and right; enter the intensification sintering stage; continuation is heated blank; get rid of involatile matter; improve the vacuum in stove; temperature arrives 1100～1200 ℃ and carries out heat preservation sintering; now in stove, be filled with argon gas; make blank under the atmosphere of protective gas, carry out sintering, make vacuum and temperature keep uniform and stable, vacuumizing, in exhaust phase; by graphite deckle board, produce heat; the mode of logical heat transfer makes temperature in stove improve uniformly again, and improves the stability of temperature in stove, to reach the uniformity of properties of product.
When the heating period completes, enter cooling stage, start blower fan 41, make refrigerating gas from the gap between sealing burner hearth 10, heating graphite deckle board 22 and body of heater 1, cool-heat-exchanger 43 gap Rapid Circulations flow, and are absorbed heat and are taken out of outside body of heater, thereby reach the object of fast reducing furnace temperature by cooling water, shorten the turnaround time, improved production efficiency.
Claims (5)
1. samarium cobalt permanent magnet body vacuum sintering furnace, it comprises pumped vacuum systems, body of heater, graphite electric heater, attemperating unit, blower fan cooling coil and PLC program control system, it is characterized in that pumped vacuum systems is by first, the second lobe pump, slide valve pump and vacuum-pumping pipeline form can regulate and control vacuum system, the sealing burner hearth that body of heater is comprised of insulating and front, rear door seal, in sealing burner hearth, establish some equally distributed heating graphite deckle boards, the thermocouple of some detection Sealing furnace bore temperatures is evenly set between heating graphite deckle board, blower fan cooling coil is established in sealing burner hearth rear end, vacuum-pumping pipeline is located between sealing burner hearth one side and blower fan cooling coil.
2. samarium cobalt permanent magnet body vacuum sintering furnace according to claim 1, is characterized in that described pumped vacuum systems also comprises machine early gate and is located at the venting valve between machine early gate and slide valve pump.
3. samarium cobalt permanent magnet body vacuum sintering furnace according to claim 1, is characterized in that described heating graphite deckle board forms a heat generating body unit by two rectangle frames that are parallel to each other, and two heat generating body units connect a power electrode.
4. samarium cobalt permanent magnet body vacuum sintering furnace according to claim 1, is characterized in that described blower fan cooling coil comprises fan and the motor that is located at sealing burner hearth cavity rear end, and the cooling water pipe joining with the cool-heat-exchanger of sealing burner hearth rear end.
5. samarium cobalt permanent magnet body vacuum sintering furnace according to claim 1, is characterized in that described insulating is comprised of molybdenum sheet inner casing, middle stuffed heat insulated heat-preservation cotton and corrosion resistant plate shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320469471.8U CN203478929U (en) | 2013-08-02 | 2013-08-02 | Vacuum sintering furnace for samarium-cobalt permanent magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320469471.8U CN203478929U (en) | 2013-08-02 | 2013-08-02 | Vacuum sintering furnace for samarium-cobalt permanent magnet |
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| CN203478929U true CN203478929U (en) | 2014-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320469471.8U Withdrawn - After Issue CN203478929U (en) | 2013-08-02 | 2013-08-02 | Vacuum sintering furnace for samarium-cobalt permanent magnet |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103398577A (en) * | 2013-08-02 | 2013-11-20 | 宁波宁港永磁材料有限公司 | Samarium cobalt permanent magnet vacuum sintering furnace |
| CN103978210A (en) * | 2014-06-06 | 2014-08-13 | 海安县鹰球粉末冶金有限公司 | Vacuum and protective atmosphere sintering furnace of metal powder injection molding part |
| CN105157424A (en) * | 2015-09-16 | 2015-12-16 | 苏州汇科机电设备有限公司 | High-temperature vacuum sintering furnace capable of heating with graphite heating rods |
| CN109724404A (en) * | 2017-10-31 | 2019-05-07 | 杭州佰晖科技有限公司 | A kind of rate of temperature fall controllable type vacuum sintering furnace and its control method |
| WO2021114074A1 (en) * | 2019-12-10 | 2021-06-17 | 宁波恒普真空技术有限公司 | 3d printing sintering device |
-
2013
- 2013-08-02 CN CN201320469471.8U patent/CN203478929U/en not_active Withdrawn - After Issue
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103398577A (en) * | 2013-08-02 | 2013-11-20 | 宁波宁港永磁材料有限公司 | Samarium cobalt permanent magnet vacuum sintering furnace |
| CN103398577B (en) * | 2013-08-02 | 2015-06-17 | 宁波宁港永磁材料有限公司 | Samarium cobalt permanent magnet vacuum sintering furnace |
| CN103978210A (en) * | 2014-06-06 | 2014-08-13 | 海安县鹰球粉末冶金有限公司 | Vacuum and protective atmosphere sintering furnace of metal powder injection molding part |
| CN103978210B (en) * | 2014-06-06 | 2016-04-13 | 海安县鹰球粉末冶金有限公司 | The dual-purpose sintering furnace of vacuum protection atmosphere of metal powder injection molded part |
| CN105157424A (en) * | 2015-09-16 | 2015-12-16 | 苏州汇科机电设备有限公司 | High-temperature vacuum sintering furnace capable of heating with graphite heating rods |
| CN109724404A (en) * | 2017-10-31 | 2019-05-07 | 杭州佰晖科技有限公司 | A kind of rate of temperature fall controllable type vacuum sintering furnace and its control method |
| WO2021114074A1 (en) * | 2019-12-10 | 2021-06-17 | 宁波恒普真空技术有限公司 | 3d printing sintering device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140312 Effective date of abandoning: 20150617 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20140312 Effective date of abandoning: 20150617 |
|
| RGAV | Abandon patent right to avoid regrant |