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II. ?????? ???????? ????? ?????????
?? ??????? 3.3 ?????????:
??? ???????? ????? 40X ?????????? ? ?????????? HB 270; ??? ?????? ????? 40? ?????????? ? ?????????? HB 245.
??????????? ?????????? ??????????
[s_? ]=(s_(H lim?b) K_HL)/([S_H])=(560�1)/1.15=485 ???.
????? ??????? ?? ??????? 3.2 ??? ?????? s_(H lim?b )= 2HB+70 = 2�245+70 = = 560 ???.
??? ?????????? ???????????? ??????????? ????????????? K_HL=1.
??????????? ???????????? ?????? [S_H ]=1,15.
??????????? K_H� ??? ?????????? ???????????? ???????? - K_H�=1.35.
??????????? ?????? ????? ?? ????????? ? ???????? ????????? ?????????? ?_bRe (???????????? ???? 12289-76).
??????? ??????? ?????? [?? ??????? (3.29)]
d_?2=K_d ?((T_2 K_H�u)/(?[s_? ]^2 (1-0.5?_bRe)?^2 ?_bRe ));
? ???? ??????? ??? ?????????? ??????? K_d=99; ???????????? ????? u=u_p=5;
d_?2=99?((85�?10?^3�1.35�5)/(?(485)^2 (1-0.50.285)?^2�0.285))=225??.
????????? ?? ???? 12289-76 ????????? ??????????? ???????? d_?2=225??.
?????? ????? ?????? ???????? z_1=25.
????? ?????? ?????? z_2=z_1 u=25�5=125.
?????? z_2=125. ????? u=z_2/z_1 125/25=5.
?????????? ?? ????????? (5-5)/5�100%=0%, ??? ?????? ?????????????? ???? 12289-76 3%.
??????? ???????? ?????? m_e=d_?2/z_2 =225/125=1.79 ??.
???????? ???????? d_?2=z_2�m_e=1.79�125=225 ??.
?????????? ?? ???????????? ???????? ?????????? (225-225)/225�100%=0%, ??? ?????????, ??? ??? ????? ??????????? 2%.
???? ??????????? ???????
?ctgd?_1=u=5; d_1=11�?43?^';
d_2=90�-d_1=90�-17�?34?^'=78�?57?^'.
??????? ???????? ?????????? R_e ? ????? ???? b:
R_e=0.5m_e v(z_1^2+z_2^2 )=113.45 ??;
b=?_bRe R_e=32.3.
??????? ??????????? ??????? ????????
d_?1=m_e z_1=44.5 ??.
??????? ??????????? ??????? ????????
d_1=2(R_e-0.5b)sind_1=40.18=40 ??.
??????? ???????? ???????? ? ?????? (?? ???????? ??????)
d_??1=d_?1+2m_? cosd_1=48 ??;
d_??2=d_?2+2m_? cosd_2=225.44 ??.
??????? ???????? ??????
m=d_1/z_1 =1.6 ??.
???????????? ?????? ???????? ?? ???????? ????????
?_bd=b/d_1 =0.8.
??????? ???????? ???????? ?????
?=(?_1 d_1)/2=1.986 ?/?.
??? ?????????? ??????? ?????? ????????? 7-? ??????? ????????.
??? ???????? ?????????? ?????????? ?????????? ??????????? ????????:
K_H=K_H� K_Ha K_H?.
?? ??????? 3.5 ??? ?_bd=0.8, ?????????? ???????????? ?????? ????????? HB<350 ???????????, ??????????? ????????????? ???????? ?? ????? ????, K_H�=1,3.
???????????, ??????????? ????????????? ???????? ????? ?????? ???????, K_Ha=1.
???????????, ??????????? ???????????? ???????? ? ??????????, ??? ?????????? ????? ??? ?=5?/? K_H?=1.05.
????? ???????, K_H=1.365.
????????? ?????????? ?????????? ?? ??????? (3.27):
s_H=335/(R_e-0.5b) v((T_2 K_H v((u^2+1)^3 ))/?bu?^2 )=474.9<[s_H ]=485 ???.
???? ? ??????????:
???????? F_t=?2T?_1/d_1 =850 ?;
?????????? ??? ????????, ?????? ?????? ??? ??????,
F_r1=F_a2=F_t�tga�cosd_1=299.88 ?;
?????? ??? ????????, ?????? ?????? ??? ??????,
F_a1=F_r2=F_t�tga�sind_1=60.58 ?.
???????? ?????? ?? ???????????? ?? ??????????? ?????? [???????? ??????? (3.31).]: s_F=(F_t K_F Y_F)/(?_F bm)=[s_F ].
??????????? ???????? K_F=K_F� K_F?.
?? ??????? 3.8 ??? ????????? HB<350, ???????? ?=1.986 ?/? ? 7-? ??????? ???????? K_F?=1.15.
????, K_F=1.38�1.15=1.587.
Y_F- ??????????? ????? ???? ???????? ? ??????????? ?? ????????????? ????? ??????:
??? ???????? z_?1=z_1/(cosd_1 )=25.5;
??? ?????? z_?2=z_2/(cosd_2 )=631.
??? ???? Y_F1=3.9 ? Y_F2=3.6.
??????????? ?????????? ??? ???????? ?????? ?? ???????????? ?? ??????????? ??????
s_F=(s_(F lim?b)^0)/[S_F ] .
?? ??????? 3.9 ??? ????? 40? ?????????? ??? ????????? HB<350 s_(F lim?b)^0=1.8 HB.
??? ???????? s_(F lim?b1)^0=1.8�270=490 ???;
??? ?????? s_(F lim?b2)^0=1.8�245=440 ???.
??????????? ?????? ????????? [S_F ]=[S_F ]^'[S_F ]''. ?? ??????? 3.9 [S_F ]^'=1,75;??? ??????? ? ????????? [S_F ]^''=1. ????? ???????, [S_F ]=1.75�1=1.75.
??????????? ?????????? ??? ??????? ?????? ?? ????????????:
??? ???????? ?[s?_F1]=490/1.75=280 ???;
??? ?????? ?[s?_F2]=440/1.75=250 ???.
??? ???????? ????????? (?[s?_F1])/Y_F1 =280/3.9=71.8 ???;
??? ?????? (?[s?_F2])/Y_F2 =250/3.6 69.9 ???.
?????????? ?????? ????? ??? ?????? ??????, ??? ??? ?????????? ????????? ??? ???? ??????.
????????? ??? ??????:
s_F2=(1.587�850�3.6)/(0.85�32.3�1.6)=250 ???.
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