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2007
1. 充3
2. 腅4.
3. 酅8.
4. 11.
5. 12
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P1 = 14 .;
n1 = 970 .;
12 HRC 5660;
;
i = 2,7;
t = 5000 .
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, II , 8 1643-81.
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1. . 8.7 12:
σ = 900 , σ = 700 ;
2. . 8.8 :
σlim = 17HRC+200 = 17*((49+59)/2)+200 = 1118 ;
SHmin = 1,1;
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3. ZN = 6√NHG/NH ≥1 ≤ 2,6, SHmin = 1,1, :
NHG , NHG1 = NHG2 = 30*2,4=30*5402,4 =10,8* 107
H=0,5*(49+59)=54 HRC=540HB .( 8.40)
NH , NH = μ*NK, μ 8.9 , (II) μ1 = μ2 = 0,25, ( ) NK =60*c*n*t, n ( n2 = n1/i); 1 = 2 = 1 ; t .
, :
n2 = 970/2,7 = 359 /.;
NK1 =60*1*970*5000 = 291*106 .;
NK2 =60*1*359*5000 = 108*106 .;
NH1 = 0,25*291*106 = 73*106;
NH2 = 0,25*108*106 = 27*106;
NHG = 30*2,4=30*5402,4 =10,8* 107;
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ZN1 = 6√10,8*107/73*106 = 1,01, 1,01≤ 1, ZN = 1;
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ZN2 = 6√10,8*107/27*106 = 0,99, 0,99 ≤ 1, ZN = 1.
4. : [σ] = (σlim/SHmin)*ZN, , [σ] = ([σ]1 + [σ]2)/2 ≤ 1,25*[σ]min, [σ]min .
, :
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[σ]1 = (1118/1,1)*1 = 1016 ;
[σ]2 = (1118/1,1)*1 = 1016 ;
[σ] = (1016+ 1016)/2 = 1016 < 1,25*1016.
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1. . 8.8 :
σFlim = 550 ;
SFmin = 1,75.
2. , Y = 1 ( ). YN ZN.
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YN = 6√NFG/NFE ≥ 1 ≤ 4
.182 NFG = 4*106 . NF = μF*NK, μF = 0,143 . 8.9, NK .
, :
NF1 = 0,143*291*106 = 41,6*106 ;
NF2 = 0,143*108*106 = 15,4*106 ;
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YN1 = 6√4*106/41,6*106 = 0,31
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YN2 = 6√4*106/15,4*106 = 0,5
.. YN1 YN2 ≤ 1, YN1 = YN2 = 1.
3. .
[σF]1 = [σF]2 = (σFlim/SFmin)*YA*YN = 550/1,75*1*1 = 314,3 .
.
.. , .
1. , , Sst = 2 m = 6 Kst = 1,3, YN max = 4.
[σF]max = σFlim*YN max*Kst/Sst = 550*4*1,3/2 = 1430 .
.
1. :
- : T1 = P1 /ω1, ω1 = πn1/30;
- : T2 = T1*i*η, η = 0,97 ( 8- . 168 ).
, :
ω1 = 3,14*970/30 = 101,5-1;
T1 = 14*103/101,5 = 138 H* = 138*103 H*;
T2 = 138*2,7*0,97 = 361 H* = 361*103 H*;
2. aw :
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aw ≈ 0,85*(u+1)*3√(E*T2*KHα*KHβ)/([σH]2*u2*ψba)
- ψba = 0,4;
- α : α = 1 +0,06*(n 5) ≤ 1,25, n = 8;
- ψbd = 0,5*ψba*(u+1) ≤ ψbd max = 0,8 (ψbd max .8.4 );
- β . 8.15 , V > 350.
- E = 2*1*2/(1+2), 1 = 2 = 2,1*105 ;
, :
α = 1 + 0,06*(8 5) = 1,18, .. 1,18 < 1,25, α = 1,25;
ψbd = 0,5*0,25*(2,7+1) = 0,46 < 0,8;
E = 2*2,1*105*2,1*105/(2,1*105+2,1*105) = 2,1*105 ;
β ≈ 1
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aw ≈ 0,85*(2,7+1)*3√(2,1*105*361*103*1,18*1,3)/(1016 2*2,72*0,4) = 106,3 .
. 143 2- , aw = 110 .
3. . :
- bw : bw = ψba*aw;
- . 8.5. ψm = 30;
- mn = bw/ ψm.
, :
bw = 0,25*110 = 27.5 ;
mn = 27,5/30 = 0,9 .
. 8.1 , 9563-80, 1- , mn = 1.
4. .
- .8.7 εβ = 1,1, εβ = bw*sin β/(π*mn) β:
- : zΣ = 2*aw/(mn);
- : z1 = zΣ/(u+1);
- : z2 = zΣ - z1.
, :
, :
sin β = εβ*π*mn/bw = 1,1*3,14*1/27,5 = 0,1256;
β = argsin 0,1256 ≈ 8 ( .8.7: 8≤β≤20)
sβ = 0,9902
zΣ = 2*110/1=220
z1 = 220/(2,7+1) = 59,5 z1 = 60> zmin = 17;
z2 = 22060 = 160.
u = z2/ z1 = 160/60 = 2,66 ( 2,7 0,01%, ).
5. ,
- d1 = mn*z1, d1 = 1*60= 60 ;
- d2 = mn*z2, d2 = 1 *160= 160 .