| Ø18 |
.
: l0=l-20%l+56, l .
l=130-26+5=111.
l0 =115.
( 2).
.
.
: - 63..65 HRC, 35..40 HRC.
4.2 . 18883-73.
40, 4045 HRC, (BxHxL=12x12x100).
, , .
.
.
.
5. .
() , () ():
= . +
, , , = .
= [(Cc*t+P) - (*t+)]* (.), (1)
- ( ), /;
t t - , ;
- ,
, ;
- ,
.
, (1), .
- :
= 0,78 ./ ,
= 0,738 ./ .
t=(L+y)* i/(S*n) ();
L - , ;
` y - , ;
S - , /;
n - , /;
i - .
, , :
= ([( - ) + nn( + .)]*t)/[ T(nn+1)] (.),
- , (.);
- , , (.);
nn - ;
- , (.);
. - , (.);
|
|
|
- , .
:
. = * t.,
t. - , ;
- ;
= /60, - .
= 81,89 ./.
:
= [(. + .** + {( - )/N})*t)]/(**) (.),
.. - , .;
.. - , .;
- ;
- ;
N - ;
- , .
= 0,315*m**N (.),
m - .
, , :
= (**)/t.
1. :
-
:
156,
- 40.
:
B×H×L=25×25×150
:
n = 800 /,
S = 0,15 /,
t = 1,
L.. = 45.
:
C = 45; = 30; m = 8; = 3; nn = 4; t = 3.
:
= 2; = 20; .. = 126; = 51; t. = 1,5; = 60; N = 5;
m = 15,6.
= 3,51 ./.
3 :
.= 81,89/60 = 0,324 ./.
2. .
) :
t = t = L../(n*S) = 45/(800*0,15) = 0,38 ().
) :
.. = *t.. = 0,38*3 = 1,13 (.).
) :
= 4,5*ρ***L = 4,5*10-3*7,8*10-3*25*25*150 = 3,29 (.)
= ([( - ) + nn( + .)]*t)/[ T(nn+1)] =
([(45 - 3,29) + 4(3 + 1,13)]*0,38)/[30(4 + 1)] = 0,15 (.).
) .
) :
. = *t.. = 0,324*1,5 = 0,486 (.).
) :
= 0,315*m**N = 0,315*15,6*20*5 = 4,914 (.).
= [(. + .** + {( - )/N})*t)]/(**) =
[(126 + 0,486*2*20 + {(51 - 4,914)/5})*0,32)]/(60*20*2) = 0,0205 (.).
) , :
= (**)/t = (60*2*20)/0,32 = 7500.
) :
= [(Cc*t+P) - (*t+)]* =
[(0,78*0,32 + 0,123) - (0,78*0,32 + 0,021)]*7500 = 765 (.).
: 765 . .
