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 公差原则 PowerPoint PPT Presentation


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 公差原则. 尺寸误差和形位误差是影响零件质量的两个重要因素。因此设计零件时,需要根据其功能和互换性要求,同时给定尺寸公差和形位公差。为了保证设计要求,正确判断零件是否合格,必须明确零件同一要素或几个要素的尺寸公差与形位公差的内在联系。 公差原则就是处理尺寸公差与形位公差之间关系的原则。  GB / T 4249—1996 规定了公差原则, GB / T 16671—1996 规定了最大实体要求、最小实体要求及可逆要求。.  公差原则. 常用术语 独立原则 相关要求.  常用术语. 1. 局部实际尺寸

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 公差原则

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GBT 42491996GB / T 166711996



1.

Dada


2.

(1


Defdef


Defdef


(2:

Dfi dfi 3.4-4


Dfi dfi


3.4-4


dfe dfi Dfe Dfi


3. MMCLMC


4. MMSLMS

DM dMDM = Dmin dM = dmax

DLdLDL = DmaxdL= dmin


5. MMVCLMVC


6. MMVSLMVS

DMVdMVDMVdMV

DLVdLV DLVdLV

DMVdMVDMVdMVDLVdLVDLVdLV3-3


()


DMV = DM t = Dmint = 30 0.03 = 29.97 mm


3.4-6 = dM t = dmax t = 15 + 0.02 = 15.02 mm

3.4-6


3.4-7 DLV =DLt = Dmax t = 20.05 0.02 = 20.07 mm

3.4-7


3.4-8 = dLt = dmint = 14.950.02 = 14.93 mm

3.4-8



7.

1MMB

2LMB


3MMVB

4LMVB




19.979200.01,


(1)


d


l


(c)

(2)



1.

E



3.4-11

119.987 20

2 dM = 20

320

4 0.013


dfe dM = dmax da dL= dmin

DfeDM = Dmin Da DL= Dmax



2.

4-65

M


1

dfedMV=dmaxt dL(dmin)dadM(dmax)

DfeDM=Dmint DL(Dmax)DaDM(Dmin)


3.4-12


3.4-12(a) 3.4-12(b)0.02 3.4-12(c)


1 29.97 30

2

dMV = dM t = 30 0.02 = 30.02

3 0.02 0.03 =0.05


M

M

2

0 0 3.4-13


3.4-13



3.

3.4-15

L


3.4-15


dfidLV= dmint dL( dmin )dadM( dmax )

DfiDM=Dmax t DL(Dmax)DaDM(Dmin)

3.4-15(a) 3.4-15(b) 0.023.4-15(c)


(129.9730

(2

dLV = dL t = 29.97 0.02 = 29.95

(3

0.020.03 =0.05


0

L

L


3.4-16

M

L

R


3.4-16


1


dfe dMV = dmax t

dL ( dmin ) da dMV ( dmax t )

DfeDM=Dmint

DL(Dmax)DaDMV(Dmint )


3.4-16 (a)0.023030 29.980.0429.97 0.053.4-16(b)0.020.013030.1030.02 3.4-16 (c)


2

()

dfi dLV= dmint

dLV ( dmint ) da dM ( dmax )

Dfi DM= Dmax t

DLV ( Dmax t ) Da DM (Dmin )


4.


  • :


1

2

3

4


1

2

3

4


1.


2.


(1




(2


(3


3.


4.





3-4


3-4


3-4



1.

(1012 121303-8

(21123-73-93-10

(3


2.

3-53-8


3-5


3-6



3-8



(1


(212

Ld

1/2


(3



55j6


12.5

255

21

60

36

12

57

3.2

3.2

C2

56r6()

1.6

0.8

0.8

A

B

C2

1.6

E

E

E

E

45m6()

62

52

55j6()

55j6()

A

D

B

A

B

C

A-B

0.025

A-B

0.020

A-B

0.015

0.005

A-B

0.025

55j6

4-2774-220.025mm4-254-2060.005mm

A-A

12N9()

B-B

16N9()

0.02

D

C

0.02

3.2

3.2

39.5

39.5


(3) 12N916N9

84-220.02mm

(4)

60.015mm

(5)


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