CN102114614B - Method for improving grinding finished product ratio of thin-walled annular rare earth permanent-magnet material - Google Patents
Method for improving grinding finished product ratio of thin-walled annular rare earth permanent-magnet material Download PDFInfo
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- CN102114614B CN102114614B CN201010033738.XA CN201010033738A CN102114614B CN 102114614 B CN102114614 B CN 102114614B CN 201010033738 A CN201010033738 A CN 201010033738A CN 102114614 B CN102114614 B CN 102114614B
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Abstract
The invention provides a method for improving the grinding finished product ratio of thin-walled annular rare earth permanent-magnet material. The method comprises the steps as follows: firstly, grinding material is utilized to perform the surface shot blast on rare earth permanent-magnet material blanks, the Mohs hardness of the grinding material ranges from 6 to 8, and the granularity of the grinding material ranges from 60 to 180 meshes; and secondly, the rare earth permanent-magnet material blanks that are processed through the surface shot blast are processed through heat treatment in air or inert gas under the temperature ranging from 80 to 350 DEG C. The method remarkably improves the grinding finished product ratio of the rare earth permanent-magnet material especially the thin-walled annular rare earth permanent-magnet material without changing the magnetic property of the rare earth permanent-magnet material.
Description
Technical field
The present invention relates to a kind of mill processing method of rare earth permanent-magnetic material, particularly a kind of mill processing method of rare earth permanent-magnetic material of thin-walled annular.
Background technology
Mill manufacturing procedure plays vital impact to the dimensional accuracy of rare earth permanent-magnetic material, outward appearance and yield rate.Because the hard fragility of sintered rare-earth permanent magnetic material, the especially rare earth permanent-magnetic material of thin-walled annular, the yield rate of its grinding is always lower.Be because the distortion of rare earth permanent-magnetic material blank is comparatively large after sintering on the one hand, thus cause dimensioned surplus not of uniform size; Be on the other hand because sintered rare-earth permanent magnetic blanks creates many latent cracks, the especially rare earth permanent-magnetic material blank of thin-walled annular in cooling procedure due to the gathering of internal stress.These all can cause difficulty to the mill processing of rare earth permanent-magnetic material blank, and affect the yield rate of rare earth permanent-magnetic material.
Can accomplish accurate control for the distortion of sintered rare-earth permanent magnetic blanks now, and sintered rare-earth permanent magnetic material needs than cooling velocity faster to obtain higher coercivity, therefore the gathering of its internal stress seems inevitable.At present the improvement of the mill processing method of rare earth permanent-magnetic material is mainly concentrated on and select suitable emery wheel, the cooling strengthening cooling water, lubrication and developing result and strengthen the aspect such as grinding depth, reduction feed rate.But the effect of above-mentioned improvement is particularly not remarkable for the sintered rare-earth permanent magnetic material of thin-walled annular, and can not greatly reduce the generation of grinding cracking phenomena.
" research of ferrite magnetic section product grinding process " (Li Yang, Yin Hong, Gao Yi " mining and metallurgy " the 11st volume the 02nd phase in 2002) in the grinding process mentioned etc. unsatisfactory to the mill processing effect of thin-walled NdFeB magnet ring, the raising for grinding yields is not remarkable yet.
The object of the invention is to provide one to significantly improve NdFeB magnet, the especially method of thin-walled annular product grinding yield rate.
Summary of the invention
The invention provides a kind of method improving grinding finished product ratio of thin-walled annular rare earth permanent-magnet material, said method comprising the steps of: (1) use Mohs' hardness is 6 ~ 8, granularity is that 60 ~ 180 object abrasive materials carry out shot blasting on surface process to rare earth permanent-magnetic material blank; (2) in air or inert gas, at the temperature of 80 DEG C ~ 350 DEG C, the rare earth permanent-magnetic material blank through shot blasting on surface process is heat-treated.
Preferably, described abrasive material is diamond dust, carborundum or aluminium oxide.
Preferably, the time of described bead is 15 ~ 60 minutes;
Preferably, the compressed air pressure of described shot blasting on surface process is 0.2 ~ 0.8MPa.
Preferably, described heat treated temperature is 80 ~ 350 DEG C.
Preferably, described heat treated temperature is 100 ~ 300 DEG C.
Preferably, the described heat treated duration is 1 ~ 3 hour.
Preferably, described inert gas is nitrogen or argon gas.
Preferably, described rare earth permanent-magnetic material is the rare earth permanent-magnetic material of thin-walled annular.
The method improving grinding finished product ratio of thin-walled annular rare earth permanent-magnet material of the present invention, before the mill process operation of prior art, first carries out shot blasting on surface process and heat treatment to rare earth permanent-magnetic material blank, then rare earth permanent-magnetic material blank is being carried out to mill processing.Mill processing method provided by the present invention effectively overcomes prior art middle rare earth permanent-magnet material, the defect that particularly the rare earth permanent-magnetic material mill processed finished products rate of thin-walled annular is low, when not changing rare earth permanent-magnetic material magnetic property, significantly improve rare earth permanent-magnetic material, particularly the yield rate of the rare earth permanent-magnetic material mill processing of thin-walled annular, greatly reduces the production cost of rare earth permanent-magnetic material.
Detailed description of the invention
For making your auditor can understand structure of the present invention, feature and other objects further, the appended preferred embodiment of existing combination is described in detail as follows, and illustrated preferred embodiment is only for illustration of technical scheme of the present invention, and non-limiting the present invention.
Embodiment 1
Use Mohs' hardness is 6, granularity is that 60 object silicon carbide abrasives carry out shot blasting on surface process to Sintered NdFeB blank ring, and the time that this shot blasting on surface process continues is 15 minutes, and this shot blasting on surface process uses the compressed air of 0.2MPa as power; Then 0.5 hour is heat-treated to the Sintered NdFeB blank ring through shot blasting on surface process at the temperature of 80 DEG C in atmosphere; Finally to carrying out the processing of cylindrical, inner circle and end face mill through heat treated Sintered NdFeB magnet ring to obtain Sintered NdFeB magnet ring finished product.See table 1.
Embodiment 2
Use Mohs' hardness is 8, granularity is that 180 object silicon carbide abrasives carry out shot blasting on surface process to Sintered NdFeB blank ring, and the time that this shot blasting on surface process continues is 60 minutes, and this shot blasting on surface process uses the compressed air of 0.8MPa as power; Then 3 hours are heat-treated to the Sintered NdFeB blank ring through shot blasting on surface process at the temperature of 350 DEG C in atmosphere; Finally to carrying out the processing of cylindrical, inner circle and end face mill through heat treated Sintered NdFeB magnet ring to obtain Sintered NdFeB magnet ring finished product.See table 1.
Embodiment 3
Use Mohs' hardness is 7, granularity is that 100 object silicon carbide abrasives carry out shot blasting on surface process to Sintered NdFeB blank ring, and the time that this shot blasting on surface process continues is 30 minutes, and this shot blasting on surface process uses the compressed air of 0.5MPa as power; Then 2 hours are heat-treated to the Sintered NdFeB blank ring through shot blasting on surface process at the temperature of 200 DEG C in atmosphere; Finally to carrying out the processing of cylindrical, inner circle and end face mill through heat treated Sintered NdFeB magnet ring to obtain Sintered NdFeB magnet ring finished product.See table 1.
Embodiment 4
Use Mohs' hardness is 6, granularity is that 180 object silicon carbide abrasives carry out shot blasting on surface process to Sintered NdFeB blank ring, and the time that this shot blasting on surface process continues is 15 minutes, and this shot blasting on surface process uses the compressed air of 0.8MPa as power; Then 1 hour is heat-treated to the Sintered NdFeB blank ring through shot blasting on surface process at the temperature of 100 DEG C in atmosphere; Finally to carrying out the processing of cylindrical, inner circle and end face mill through heat treated Sintered NdFeB magnet ring to obtain Sintered NdFeB magnet ring finished product.See table 1.
Embodiment 5
Use Mohs' hardness is 8, granularity is that 60 object alumina abrasives carry out shot blasting on surface process to Sintered NdFeB blank ring, and the time that this shot blasting on surface process continues is 15 minutes, and this shot blasting on surface process uses the compressed air of 0.8MPa as power; Then 1 hour is heat-treated to the Sintered NdFeB blank ring through shot blasting on surface process at the temperature of 300 DEG C in atmosphere; Finally to carrying out the processing of cylindrical, inner circle and end face mill through heat treated Sintered NdFeB magnet ring to obtain Sintered NdFeB magnet ring finished product.See table 1.
Embodiment 6
Use Mohs' hardness is 8, granularity is that 60 object silicon carbide abrasives carry out shot blasting on surface process to Sintered NdFeB blank ring, and the time that this shot blasting on surface process continues is 60 minutes, and this shot blasting on surface process uses the compressed air of 0.2MPa as power; Then in nitrogen atmosphere, at the temperature of 300 DEG C, 3 hours are heat-treated to the Sintered NdFeB blank ring through shot blasting on surface process; Finally to carrying out the processing of cylindrical, inner circle and end face mill through heat treated Sintered NdFeB magnet ring to obtain Sintered NdFeB magnet ring finished product.See table 1.
Embodiment 7
Use Mohs' hardness is 6, granularity is that 180 object alumina abrasives carry out shot blasting on surface process to Sintered NdFeB blank ring, and the time that this shot blasting on surface process continues is 60 minutes, and this shot blasting on surface process uses the compressed air of 0.2MPa as power; Then in argon gas atmosphere, at the temperature of 100 DEG C, 3 hours are heat-treated to the Sintered NdFeB blank ring through shot blasting on surface process; Finally to carrying out the processing of cylindrical, inner circle and end face mill through heat treated Sintered NdFeB magnet ring to obtain Sintered NdFeB magnet ring finished product.See table 1.
Table 1
It is to be understood that foregoing invention content and detailed description of the invention are intended to the practical application proving technical scheme provided by the present invention, should not be construed as limiting the scope of the present invention.Those skilled in the art in spirit of the present invention and principle, when doing various amendment, equivalent replace or improve.Protection scope of the present invention is as the criterion with appended claims.
Claims (3)
1. improve a method for grinding finished product ratio of thin-walled annular rare earth permanent-magnet material, it is characterized in that, said method comprising the steps of:
(1) use that Mohs' hardness is 6 ~ 8, granularity is that 60 ~ 180 object abrasive materials carry out shot blasting on surface process to rare earth permanent-magnetic material blank, described abrasive material is diamond dust, carborundum or aluminium oxide; The time of described shot blasting on surface process is 15 ~ 60 minutes; The compressed air pressure of described shot blasting on surface process is 0.2 ~ 0.8MPa; With
(2) in air or inert gas, heat-treat at the temperature of 80 DEG C ~ 350 DEG C to the rare earth permanent-magnetic material blank through shot blasting on surface process, the described heat treated duration is 1 ~ 3 hour.
2. method according to claim 1, is characterized in that, described heat treated temperature is 100 ~ 300 DEG C.
3. method according to claim 1, is characterized in that, described inert gas is nitrogen or argon gas.
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