CN102114614A - 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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- CN102114614A CN102114614A CN201010033738XA CN201010033738A CN102114614A CN 102114614 A CN102114614 A CN 102114614A CN 201010033738X A CN201010033738X A CN 201010033738XA CN 201010033738 A CN201010033738 A CN 201010033738A CN 102114614 A CN102114614 A CN 102114614A
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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 ring-type.
Background technology
The mill manufacturing procedure plays fundamental influence to dimensional accuracy, outward appearance and the yield rate of rare earth permanent-magnetic material.Because the hard fragility of sintered rare-earth permanent magnetic material, the especially rare earth permanent-magnetic material of thin-walled ring-type, the yield rate of its grinding is lower always.Be because the distortion of rare earth permanent-magnetic material blank is bigger behind the sintering on the one hand, thereby cause the dimensioned surplus not of uniform size; Be because the gathering owing to internal stress in cooling procedure of sintered rare-earth permanent magnetic blanks has produced many recessive crackles on the other hand, the rare earth permanent-magnetic material blank of thin-walled ring-type especially.These all can cause difficulty to the mill processing of rare earth permanent-magnetic material blank, and influence the yield rate of rare earth permanent-magnetic material.
Now can accomplish accurate control, and the sintered rare-earth permanent magnetic material need be than cooling velocity faster in order to obtain higher coercivity, so the gathering of its internal stress seems inevitable for the distortion of sintered rare-earth permanent magnetic blanks.At present the improvement of the mill processing method of rare earth permanent-magnetic material is mainly concentrated on the cooling selecting suitable emery wheel, strengthen cooling water, lubricated and developing result and strengthen grinding depth, reduce aspect such as feed rate.But above-mentioned improved effect is particularly not remarkable for the sintered rare-earth permanent magnetic material of thin-walled ring-type, and can not significantly reduce the generation of grinding cracking phenomena.
" ferrite magnetic section product mill Research on processing technology " (Li Yang, Yin Hong, 2002 the 11st the 02nd phases of volume of Gao Yi " mining and metallurgy ") grinding process of being mentioned in etc. are unsatisfactory to the mill processing effect of thin-walled NdFeB magnet ring, and are also not remarkable for the raising of grinding yields.
The objective of the invention is for a kind of NdFeB of significantly improving magnet is provided, especially the method for thin-walled ring-type product grinding yield rate.
Summary of the invention
The invention provides a kind of method of improving thin-walled ring-type rare earth permanent-magnetic material mill processed finished products rate, said method comprising the steps of: (1) uses that Mohs' hardness is 6～8, granularity is that 60～180 purpose abrasive materials carry out shot blasting on surface to the rare earth permanent-magnetic material blank and handle; (2) in air or inert gas, under 80 ℃～350 ℃ temperature, the rare earth permanent-magnetic material blank of handling through shot blasting on surface 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 processing is 0.2～0.8MPa.
Preferably, described heat treated temperature is 80～350 ℃.
Preferably, described heat treated temperature is 100～300 ℃.
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 ring-type.
The method of improving thin-walled ring-type rare earth permanent-magnetic material mill processed finished products rate of the present invention before the mill process operation of prior art, is carried out shot blasting on surface to the rare earth permanent-magnetic material blank earlier and is handled and heat treatment, then the rare earth permanent-magnetic material blank is being ground processing.Mill processing method provided by the present invention has overcome prior art middle rare earth permanent-magnet material effectively, particularly the rare earth permanent-magnetic material of thin-walled ring-type grinds the low defective of processed finished products rate, under the situation that does not change the rare earth permanent-magnetic material magnetic property, significantly improve rare earth permanent-magnetic material, particularly the rare earth permanent-magnetic material of thin-walled ring-type grinds the yield rate of processing, greatly reduces the production cost of rare earth permanent-magnetic material.
The specific embodiment
For making your auditor can further understand structure of the present invention, feature and other purposes, now be described in detail as follows in conjunction with appended preferred embodiment, illustrated preferred embodiment only is used to technical scheme of the present invention is described, and non-limiting the present invention.
Embodiment 1
Use that Mohs' hardness is 6, granularity is that 60 purpose silicon carbide abrasives carry out shot blasting on surface to Sintered NdFeB blank ring and handle, it is 15 minutes that this shot blasting on surface is handled the time that continues, this shot blasting on surface handle use 0.2MPa compressed air as power; In air, under 80 ℃ the temperature Sintered NdFeB blank ring of handling through shot blasting on surface was heat-treated 0.5 hour then; At last to carrying out cylindrical, interior circle and the processing of end face mill through heat treated Sintered NdFeB magnet ring to obtain Sintered NdFeB magnet ring finished product.Referring to table 1.
Embodiment 2
Use that Mohs' hardness is 8, granularity is that 180 purpose silicon carbide abrasives carry out shot blasting on surface to Sintered NdFeB blank ring and handle, it is 60 minutes that this shot blasting on surface is handled the time that continues, this shot blasting on surface handle use 0.8MPa compressed air as power; In air, under 350 ℃ the temperature Sintered NdFeB blank ring of handling through shot blasting on surface was heat-treated 3 hours then; At last to carrying out cylindrical, interior circle and the processing of end face mill through heat treated Sintered NdFeB magnet ring to obtain Sintered NdFeB magnet ring finished product.Referring to table 1.
Embodiment 3
Use that Mohs' hardness is 7, granularity is that 100 purpose silicon carbide abrasives carry out shot blasting on surface to Sintered NdFeB blank ring and handle, it is 30 minutes that this shot blasting on surface is handled the time that continues, this shot blasting on surface handle use 0.5MPa compressed air as power; In air, under 200 ℃ the temperature Sintered NdFeB blank ring of handling through shot blasting on surface was heat-treated 2 hours then; At last to carrying out cylindrical, interior circle and the processing of end face mill through heat treated Sintered NdFeB magnet ring to obtain Sintered NdFeB magnet ring finished product.Referring to table 1.
Embodiment 4
Use that Mohs' hardness is 6, granularity is that 180 purpose silicon carbide abrasives carry out shot blasting on surface to Sintered NdFeB blank ring and handle, it is 15 minutes that this shot blasting on surface is handled the time that continues, this shot blasting on surface handle use 0.8MPa compressed air as power; In air, under 100 ℃ the temperature Sintered NdFeB blank ring of handling through shot blasting on surface was heat-treated 1 hour then; At last to carrying out cylindrical, interior circle and the processing of end face mill through heat treated Sintered NdFeB magnet ring to obtain Sintered NdFeB magnet ring finished product.Referring to table 1.
Embodiment 5
Use that Mohs' hardness is 8, granularity is that 60 purpose alumina abrasives carry out shot blasting on surface to Sintered NdFeB blank ring and handle, it is 15 minutes that this shot blasting on surface is handled the time that continues, this shot blasting on surface handle use 0.8MPa compressed air as power; In air, under 300 ℃ the temperature Sintered NdFeB blank ring of handling through shot blasting on surface was heat-treated 1 hour then; At last to carrying out cylindrical, interior circle and the processing of end face mill through heat treated Sintered NdFeB magnet ring to obtain Sintered NdFeB magnet ring finished product.Referring to table 1.
Embodiment 6
Use that Mohs' hardness is 8, granularity is that 60 purpose silicon carbide abrasives carry out shot blasting on surface to Sintered NdFeB blank ring and handle, it is 60 minutes that this shot blasting on surface is handled the time that continues, this shot blasting on surface handle use 0.2MPa compressed air as power; In nitrogen atmosphere, under 300 ℃ the temperature Sintered NdFeB blank ring of handling through shot blasting on surface was heat-treated 3 hours then; At last to carrying out cylindrical, interior circle and the processing of end face mill through heat treated Sintered NdFeB magnet ring to obtain Sintered NdFeB magnet ring finished product.Referring to table 1.
Embodiment 7
Use that Mohs' hardness is 6, granularity is that 180 purpose alumina abrasives carry out shot blasting on surface to Sintered NdFeB blank ring and handle, it is 60 minutes that this shot blasting on surface is handled the time that continues, this shot blasting on surface handle use 0.2MPa compressed air as power; In argon gas atmosphere, under 100 ℃ the temperature Sintered NdFeB blank ring of handling through shot blasting on surface was heat-treated 3 hours then; At last to carrying out cylindrical, interior circle and the processing of end face mill through heat treated Sintered NdFeB magnet ring to obtain Sintered NdFeB magnet ring finished product.Referring to table 1.
Table 1
What need statement is that the foregoing invention content and the specific embodiment are intended to prove the practical application of technical scheme provided by the present invention, should not be construed as the qualification to protection domain of the present invention.Those skilled in the art are in spirit of the present invention and principle, when doing various modifications, being equal to and replacing or improve.Protection scope of the present invention is as the criterion with appended claims.
Claims (9)
1. a method of improving thin-walled ring-type rare earth permanent-magnetic material mill processed finished products rate is characterized in that, said method comprising the steps of:
(1) use that Mohs' hardness is 6～8, granularity is that 60～180 purpose abrasive materials carry out shot blasting on surface to the rare earth permanent-magnetic material blank and handle; With
(2) in air or inert gas, under 80 ℃～350 ℃ temperature, the rare earth permanent-magnetic material blank of handling through shot blasting on surface is heat-treated.
2. method according to claim 1 is characterized in that, described abrasive material is diamond dust, carborundum or aluminium oxide.
3. method according to claim 1 is characterized in that, the time of described bead is 15～60 minutes.
4. method according to claim 1 is characterized in that, the compressed air pressure that described shot blasting on surface is handled is 0.2～0.8MPa.
5. method according to claim 1 is characterized in that, described heat treated temperature is 80～350 ℃.
6. the method for stating according to claim 4 is characterized in that, described heat treated temperature is 100～300 ℃.
7. method according to claim 1 is characterized in that, the described heat treated duration is 1～3 hour.
8. method according to claim 1 is characterized in that, described inert gas is nitrogen or argon gas.
9. according to each described method of claim 1～8, it is characterized in that described rare earth permanent-magnetic material is the rare earth permanent-magnetic material of thin-walled ring-type.
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