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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


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1.

Dada


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2.

(1


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Defdef


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Defdef


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(2:

Dfi dfi 3.4-4


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Dfi dfi


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3.4-4


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dfe dfi Dfe Dfi


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3. MMCLMC


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4. MMSLMS

DM dMDM = Dmin dM = dmax

DLdLDL = DmaxdL= dmin


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5. MMVCLMVC


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6. MMVSLMVS

DMVdMVDMVdMV

DLVdLV DLVdLV

DMVdMVDMVdMVDLVdLVDLVdLV3-3


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()


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


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

3.4-6


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

3.4-7


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

3.4-8


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7.

1MMB

2LMB


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3MMVB

4LMVB


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19.979200.01,


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(1)


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d


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l


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(c)

(2)


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1.

E


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3.4-11

119.987 20

2 dM = 20

320

4 0.013


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dfe dM = dmax da dL= dmin

DfeDM = Dmin Da DL= Dmax


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2.

4-65

M


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1

dfedMV=dmaxt dL(dmin)dadM(dmax)

DfeDM=Dmint DL(Dmax)DaDM(Dmin)


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3.4-12


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


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1 29.97 30

2

dMV = dM t = 30 0.02 = 30.02

3 0.02 0.03 =0.05


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M

M

2

0 0 3.4-13


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3.4-13


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3.

3.4-15

L


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3.4-15


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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)


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(129.9730

(2

dLV = dL t = 29.97 0.02 = 29.95

(3

0.020.03 =0.05


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0

L

L


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3.4-16

M

L

R


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3.4-16


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1


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dfe dMV = dmax t

dL ( dmin ) da dMV ( dmax t )

DfeDM=Dmint

DL(Dmax)DaDMV(Dmint )


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


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2

()

dfi dLV= dmint

dLV ( dmint ) da dM ( dmax )

Dfi DM= Dmax t

DLV ( Dmax t ) Da DM (Dmin )


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4.


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  • :


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1

2

3

4


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1

2

3

4


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1.


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2.


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(1


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(2


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(3


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3.


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4.


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3-4


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3-4


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3-4


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1.

(1012 121303-8

(21123-73-93-10

(3


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2.

3-53-8


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3-5


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3-6


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3-8


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(1


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(212

Ld

1/2


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(3


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55j6


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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


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(3) 12N916N9

84-220.02mm

(4)

60.015mm

(5)


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