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Dimension and line position tolerance standard of sintered Nd-Fe-B and bonded Nd-Fe-B

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Neodymium iron boron magnet manufacturers generally control the size and tolerance of magnetic materials very strictly, and users generally have certain requirements for the size tolerance and form and position tolerance of neodymium iron boron, because the unqualified product size will lead to the failure of neodymium iron boron components to install, or even damage the machine. Substandard size often leads to the risk of batch returns.
The net editor of NdFeB magnet manufacturers has sorted out the basic requirements for dimensional tolerance and form and position tolerance of sintered NdFeB and bonded NdFeB national standards for you, which can be used in design and material selection.

National standard for dimension deviation and row position deviation of sintered NdFeB:

Size range

 

Deviation of sintering surface

 

Machining surface deviation

 

Perpendicular to pressing direction

 

Pressing direction

 

Flat grinding

 

Internal and external grinding

 

Wire cutting

 

Section
≤10

 

±0.20

 

±0.30

 

±0.05

 

±0.05

 

±0.03

 

±0.03

 

10~20

 

±0.30

 

±0.40

 

±0.05

 

±0.08

 

±0.05

 

±0.05

 

20~50

 

±0.50

 

±0.65

 

±0.10

 

±0.13

 

±0.08

 

±0.10

 

50~80
±1.00
±1.10
±0.15
±0.20
±0.13
±0.15

       

Deviation type
 
Examination site
 
Basic dimension / mm
 
Deviation
Parallelism
 
Between machining surfaces
 
Arbitrary
 
One half of the tolerance between two planes
 
Verticality
 
Between sintering faces
 
Arbitrary
 
90°±1°
 
Between processing surface and sintering surface
 
90°±1°
 
Between two machining surfaces
 
90°±1°
 
Coaxiality
 
Between sintering faces
 
External diameter
 
≤14
 
±0.35mm
 
>14~24
 
±0.60mm
 
>24~40
 
±0.80mm
 
>40~60
 
±1.10mm
 
>60~80
 
±1.50mm
 
>80~100
 
±2.00mm
 
Between machining surfaces
Arbitrarily
±0.80mm 

National standard for dimension deviation and row position deviation of bonded NdFeB:

Diameter range / mm Dimensional tolerance of diameter
 
Height range / mm
 
Dimensional tolerance of height
 
A B C A B C
≤4
 
0.04 0.04 0.06 ≤4
 
0.06 0.08 0.10
>4~10
 
0.04 0.04 0.06 >4~10
 
0.08 0.10 0.14
>10~18
 
0.04 0.06 0.08 >10~18
 
0.10 0.14 0.20
>18~30
 
0.06 0.08 0.10 >18~30
 
0.14 0.20 0.24
>30~50
 
0.08 0.10 0.12 >30~50
 
0.20 0.24 0.30
>50~80
 
0.10 0.12 0.20 >50~80
 
0.24 0.30 0.34
>80~100
 
0.12 0.15 0.26 >80~100
 
0.28 0.35 0.40
>100
 
0.15 0.18 0.30 >100
 
0.35 0.42 0.48
Diameter range / mm Dimensional tolerance of diameter
 
Height range / mm
 
Dimensional tolerance of height
 
A B C A B C
≤4
 
0.04 0.04 0.06 ≤4
 
0.06 0.08 0.10
>4~10
 
0.04 0.04 0.06 >4~10
 
0.08 0.10 0.14
>10~18
 
0.04 0.06 0.08 >10~18
 
0.10 0.14 0.20
>18~30
 
0.06 0.08 0.10 >18~30
 
0.14 0.20 0.24
>30~50
 
0.08 0.10 0.12 >30~50
 
0.20 0.24 0.30
>50~80
 
0.10 0.12 0.20 >50~80
 
0.24 0.30 0.34
>80~100
0.12 0.15 0.26 >80~100
 
0.28 0.35 0.40
>100
0.15 0.18 0.30 >100
0.35 0.42 0.48
Note: the dimension, form and position tolerances of bonded NdFeB permanent magnet products vary with their application fields and shapes. Taking the ring as an example, the tolerance values of the same dimension, form and position can be divided into three categories: A, B and C.
Only when the measurement of dimension, form and position tolerance is qualified, the workpiece assembly is safe and reliable. There are some manufacturers do not pay attention to the form and position tolerance, so that parts can not be assembled, resulting in customer complaints or return incidents from time to time.

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