CN104128604A - Method for controlling atmosphere of sintering furnace - Google Patents
Method for controlling atmosphere of sintering furnace Download PDFInfo
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- CN104128604A CN104128604A CN201410308931.8A CN201410308931A CN104128604A CN 104128604 A CN104128604 A CN 104128604A CN 201410308931 A CN201410308931 A CN 201410308931A CN 104128604 A CN104128604 A CN 104128604A
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- sintering furnace
- cyclelog
- thermophase
- vacuum degree
- stove
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Abstract
The invention discloses a method for controlling atmosphere of a sintering furnace. The method includes the steps of 1, dividing a heating zone of the sintering furnace to obtain a low temperature phase, a medium temperature phase and a high temperature phase; 2, setting corresponding upper and lower limits of vacuum degrees according to the low temperature phase, the medium temperature phase and the high temperature phase obtained in the step 1, and inputting the upper and lower limits of the vacuum degrees of the phases into a programming controller used in the step 1; 3, starting a vacuum pump to evacuate a body of the sintering furnace, acquiring actual vacuum degree of the sintering furnace, and allowing the programming controller to adjust a heating speed according to whether or not the acquired actual interior vacuum degree is between the upper and lower limits of the corresponding set vacuum degree. Heating speed of every phase is controlled via the programming controller.
Description
Technical field
The present invention relates to the production field of neodymium iron boron, particularly a kind of method of sintering furnace controlled atmospher.
Background technology
Sintered Nd-Fe-B permanent magnetic material is the dusty material that a kind of chemism is strong, and the higher surface energy of surface area storage of known neodymium iron boron powder, has stronger adsorption capacity to gas, liquid particle.In the process heating up at sintering, Sintered NdFeB magnet can discharge a large amount of atmosphere, and some pernicious gases are discharged the qualification rate that can affect product not in time, so the control for furnace atmosphere in sintering process is most important.
At present, in the pressed compact venting stage of sintering process, vacuum is very low, and whether the vacuum that is difficult to direct judgment device meets the demands, and affects the qualification rate of product.
The information that is disclosed in this background technology part is only intended to increase the understanding to general background of the present invention, and should not be regarded as admitting or imply that in any form this information structure has been the known prior art of persons skilled in the art.
Summary of the invention
The object of the present invention is to provide a kind of method of sintering furnace controlled atmospher, can effectively control the furnace atmosphere of sintered NdFeB pressed compact in the different phase of temperature-rise period, improve the qualification rate of product.
For achieving the above object, a kind of method that the invention provides sintering furnace controlled atmospher, comprises the steps: step 1, divides the heating interval of sintering furnace, make heating interval be divided into low thermophase, middle thermophase and hot stage, the rate of warming in per stage is by cyclelog control; Step 2, sets higher limit and the lower limit of corresponding vacuum according to the low thermophase in step 1, middle thermophase and hot stage, and by the cyclelog in the higher limit of the vacuum in per stage and lower limit input step 1; Step 3, starts vavuum pump the body of heater of sintering furnace is found time, and gathers the practical vacuum degree in stove, and whether cyclelog adjusts rate of warming between the higher limit of the corresponding vacuum in setting and lower limit according to the practical vacuum degree in the stove gathering.
Preferably, in step 3, when the practical vacuum degree in the stove gathering is during lower than lower limit or higher than higher limit, cyclelog reduces heating rate automatically; In the time that the practical vacuum degree in the stove gathering is between lower limit and higher limit, cyclelog recovers heating rate automatically.
Preferably, in step 3, when the practical vacuum degree in the stove gathering is during lower than lower limit or higher than higher limit, cyclelog sends alarm signal to alarm.
Preferably, between the heating region of low thermophase, middle thermophase and hot stage, be respectively room temperature-650 DEG C, 650 DEG C-850 DEG C and 850 DEG C-1120 DEG C.
Preferably, the rate of warming of low thermophase, middle thermophase and hot stage is respectively 4-6 DEG C/min, 1.2-2 DEG C/min and 0.9-1.1 DEG C/min.
Compared with prior art, the present invention has following beneficial effect: by the temperature-rise period of sintered NdFeB pressed compact is divided to the different heating periods, can effectively control furnace atmosphere, vacuum state, avoid sintering briquette oxidation, improve the qualification rate of sintering briquette, this programme practicality simple to operate, device installation and maintenance are easy, have good value for applications.
Brief description of the drawings
Fig. 1 is according to the sintering process curve map in the method for sintering furnace controlled atmospher of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail, but is to be understood that protection scope of the present invention is not subject to the restriction of detailed description of the invention.
Unless separately there is other clearly to represent, otherwise in whole description and claims, term " comprises " or its conversion was stated being understood to include as " comprising " or " including " etc. element or part, and do not get rid of other element or other part.
According to the method for a kind of sintering furnace controlled atmospher of the specific embodiment of the invention, comprise the steps:
Step 1, the heating interval of division sintering furnace, makes heating interval be divided into low thermophase, middle thermophase and hot stage, and the rate of warming in per stage is by cyclelog control (referring to Fig. 1);
Step 2, sets higher limit and the lower limit of corresponding vacuum according to the low thermophase in step 1, middle thermophase and hot stage, and by the cyclelog in the higher limit of the vacuum in per stage and lower limit input step 1;
Step 3, starts vavuum pump the body of heater of sintering furnace is found time, and gathers the practical vacuum degree in stove, and whether cyclelog adjusts rate of warming between the higher limit of the corresponding vacuum in setting and lower limit according to the practical vacuum degree in the stove gathering.
In above-mentioned steps 1, between the heating region of the low thermophase that the present embodiment provides, middle thermophase and hot stage, be respectively room temperature-650 DEG C, 650 DEG C-850 DEG C and 850 DEG C-1120 DEG C, corresponding rate of warming is respectively 4-6 DEG C/min, 1.2-2 DEG C/min and 0.9-1.1 DEG C/min.
In addition, higher limit and the lower limit of the vacuum of corresponding low thermophase, middle thermophase and hot stage see table:
Wherein, E-01 represents 10
-1, E+00 represents 10
0, such as 8.50E-01 is 8.50*10
-1=0.85.
In above-mentioned steps 3, when the practical vacuum degree in the stove gathering is during lower than lower limit or higher than higher limit, cyclelog reduces heating rate automatically, simultaneously, cyclelog sends alarm signal to alarm, and alert or maintenance personal need be investigated processing in time, effectively impels the harmful atmosphere in blank, stove to get rid of in time, avoid sintering briquette oxidation, thereby ensure that outward appearance, the performance of blank in sintering process are unaffected; In the time that the practical vacuum degree in the stove gathering is between lower limit and higher limit, cyclelog recovers heating rate automatically.
In a word, the method of this sintering furnace controlled atmospher is by dividing the different heating periods to the temperature-rise period of sintered NdFeB pressed compact, can effectively control furnace atmosphere, vacuum state, avoid sintering briquette oxidation, improve the qualification rate of sintering briquette, this programme practicality simple to operate, device installation and maintenance are easy, have good value for applications.
The aforementioned description to concrete exemplary of the present invention is in order to illustrate and the object of illustration.These descriptions not want the present invention to be defined as disclosed precise forms, and obviously, according to above-mentioned instruction, can much change and change.Exemplary embodiment is selected and the object described is to explain certain principles of the present invention and practical application thereof, thereby made those skilled in the art can realize and utilize various exemplary of the present invention and various selection and change.Scope of the present invention is intended to be limited by claims and equivalents thereof.
Claims (5)
1. a method for sintering furnace controlled atmospher, is characterized in that, comprises the steps:
Step 1, the heating interval of division sintering furnace, makes described heating interval be divided into low thermophase, middle thermophase and hot stage, and the rate of warming in per stage is by cyclelog control;
Step 2, sets higher limit and the lower limit of corresponding vacuum according to the low thermophase in step 1, middle thermophase and hot stage, and by the cyclelog in the higher limit of the vacuum in per stage and lower limit input step 1;
Step 3, starting vavuum pump finds time to the body of heater of sintering furnace, and gathering the practical vacuum degree in stove, whether described cyclelog adjusts rate of warming between the higher limit of the corresponding vacuum in setting and lower limit according to the practical vacuum degree in the stove gathering.
2. the method for sintering furnace controlled atmospher according to claim 1, is characterized in that, in step 3, when the practical vacuum degree in the stove gathering is during lower than described lower limit or higher than described higher limit, cyclelog reduces heating rate automatically; In the time that the practical vacuum degree in the stove gathering is between described lower limit and described higher limit, cyclelog recovers heating rate automatically.
3. the method for sintering furnace controlled atmospher according to claim 2, is characterized in that, in step 3, when the practical vacuum degree in the stove gathering is during lower than described lower limit or higher than described higher limit, described cyclelog sends alarm signal to alarm.
4. the method for sintering furnace controlled atmospher according to claim 1, is characterized in that, is respectively room temperature-650 DEG C, 650 DEG C-850 DEG C and 850 DEG C-1120 DEG C between the heating region of described low thermophase, described middle thermophase and described hot stage.
5. the method for sintering furnace controlled atmospher according to claim 4, is characterized in that, the rate of warming of described low thermophase, described middle thermophase and described hot stage is respectively 4-6 DEG C/min, 1.2-2 DEG C/min and 0.9-1.1 DEG C/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410308931.8A CN104128604A (en) | 2014-07-01 | 2014-07-01 | Method for controlling atmosphere of sintering furnace |
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| CN201410308931.8A CN104128604A (en) | 2014-07-01 | 2014-07-01 | Method for controlling atmosphere of sintering furnace |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106424721A (en) * | 2015-08-11 | 2017-02-22 | 精工爱普生株式会社 | Sintered body production method, degreased body production method, and heating furnace |
| CN111306941A (en) * | 2020-03-12 | 2020-06-19 | 浙江吉成新材股份有限公司 | Vacuum degree abnormity alarm device for high-temperature pressureless sintering |
| CN116538798A (en) * | 2023-04-28 | 2023-08-04 | 山田新材料集团有限公司 | Atmosphere control system and method for ultra-high temperature vacuum sintering furnace |
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| JPH11230678A (en) * | 1998-02-16 | 1999-08-27 | Hitachi Powdered Metals Co Ltd | Continuous heating furnace |
| JP2003148870A (en) * | 2001-11-12 | 2003-05-21 | Umk Technology Kk | Vacuum radiation heat treating device |
| CN101423903A (en) * | 2008-11-27 | 2009-05-06 | 宁波同创强磁材料有限公司 | Nd-Fe-B high-sintering process |
| CN103000363A (en) * | 2012-11-02 | 2013-03-27 | 宁波永久磁业有限公司 | Partial pressure sintering method for sintering neodymium-iron-boron magnet |
| CN103317135A (en) * | 2013-06-14 | 2013-09-25 | 宁波华辉磁业有限公司 | High-temperature sintering process for neodymium iron boron |
| CN103489619A (en) * | 2013-10-14 | 2014-01-01 | 北京科技大学 | Method for preparing dense fine-grain neodymium iron boron sintering magnet |
| CN103594243A (en) * | 2013-11-20 | 2014-02-19 | 宁波科田磁业有限公司 | Manufacturing method capable of preventing sintered neodymium iron boron magnet from cracking |
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2014
- 2014-07-01 CN CN201410308931.8A patent/CN104128604A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH11230678A (en) * | 1998-02-16 | 1999-08-27 | Hitachi Powdered Metals Co Ltd | Continuous heating furnace |
| JP2003148870A (en) * | 2001-11-12 | 2003-05-21 | Umk Technology Kk | Vacuum radiation heat treating device |
| CN101423903A (en) * | 2008-11-27 | 2009-05-06 | 宁波同创强磁材料有限公司 | Nd-Fe-B high-sintering process |
| CN103000363A (en) * | 2012-11-02 | 2013-03-27 | 宁波永久磁业有限公司 | Partial pressure sintering method for sintering neodymium-iron-boron magnet |
| CN103317135A (en) * | 2013-06-14 | 2013-09-25 | 宁波华辉磁业有限公司 | High-temperature sintering process for neodymium iron boron |
| CN103489619A (en) * | 2013-10-14 | 2014-01-01 | 北京科技大学 | Method for preparing dense fine-grain neodymium iron boron sintering magnet |
| CN103594243A (en) * | 2013-11-20 | 2014-02-19 | 宁波科田磁业有限公司 | Manufacturing method capable of preventing sintered neodymium iron boron magnet from cracking |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106424721A (en) * | 2015-08-11 | 2017-02-22 | 精工爱普生株式会社 | Sintered body production method, degreased body production method, and heating furnace |
| CN111306941A (en) * | 2020-03-12 | 2020-06-19 | 浙江吉成新材股份有限公司 | Vacuum degree abnormity alarm device for high-temperature pressureless sintering |
| CN111306941B (en) * | 2020-03-12 | 2022-03-25 | 浙江吉成新材股份有限公司 | Vacuum gauge abnormity alarm device for monitoring vacuum degree of high-temperature pressureless sintering |
| CN116538798A (en) * | 2023-04-28 | 2023-08-04 | 山田新材料集团有限公司 | Atmosphere control system and method for ultra-high temperature vacuum sintering furnace |
| CN116538798B (en) * | 2023-04-28 | 2023-12-15 | 山田新材料集团有限公司 | Atmosphere control system and method for ultra-high temperature vacuum sintering furnace |
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Application publication date: 20141105 |