'
η = 2/1 = η1 η2 η3. (28.47)
2, 1 ; η1, η2, η3 , , .
' , ' ' . ' , , ' , ' (. 28.9, ). ' .
F = Fn cos αn [. (28.27) . 28.7, ] ', Fs = Fn f . ֳ F, F0 φ't
tg φ' = Fs/F0 = f /cos αn; φ' = arctg (f /cos αn), (28.48)
φ' , f .
F ' ' , Ft1 ' Fa1, Ft2 ' :
Ft1 = F sin (γ + φ'); Fa1 = Ft2 = F cos (γ + φ'). (28.49)
' ' ' (' )
η1 = T2 ω2/(T1 ω 1) = Ft2 d2 ω2 /(Ft1 d1 ω1).
Ft1 Ft2 d2 = mz2, d1= mq, tg γ = z1/q ω1/ω2 = u = z2/z1, '
η1 = tg γ / tg (γ + φ') (29.50)
γ '.
' ' ' (' ).
, ', . 28.9, ,
η*1 = [tg (γ φ')] / tg γ. (28.51)
φ' ' . 28.8. ' > 45 HRC.
φ' vs, , ( f).
(28.51) , γ ≤ φ ' ' , η*1 ≤ 0. .
' ' γ, z1 ' q. ' :
|
|
η1= 0,70...0,75 z1 = 1; η1 = 0,80...0,90 z1 = 2...4.
η2η3 = 0,95...0,96. '
η = (0,95...0,96) tg γ/ tg (γ + φ'). (28.62)
' , . , . ' .
tM < [t] M. (28.53)
tM ; [t]M , 7585. 100110.
, ,
∆ = 1 2 = 1 (1 η).
, ,
= K A (tM t0).
∆ =
1 (1 η) = K A (tM t0).
tM = t0 + 1 (1 η) / (K A), (28.54)
1 , , ; K , K = (9... 17) /(2 ) , ; , 2; t0 , , .
(28.53), ( ), . =(25...30)/(2).