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18 Pnevmatik press kalıplama mashinasini hisoblash


Mashq qilish.Pnevmatik press mashinasining asosiy konstruktiv parametrlarini aniqlang.
Dastlabki ma'lumotlar.Tarmoqdagi havo bosimi R0=6,0 kg/sm2. Kolba maydoni F0 =50*40=2000 sm2; kolba balandligi 15 sm.Model hajmi Vm=0,25*Vop=0,25*40*50*15=7500 sm3. Kolbadagi aralashmaning o'rtacha siqilish darajasi =1,66 g/sm3. Aralashmaning dastlabki siqilish darajasi 0=1,2 g/sm3.
Yechim.
1 Maxsus bosish bosimi


P=
P= 3,0 kg/sm2;

2 Yukning og'irligi va ishqalanish kuchlari

Q+R=0,12pF0


Q+ R \u003d 0,12 * 3 * 2000 \u003d 720 kg


R=0,25Q
R\u003d 0,25 * 575 \u003d 145 kg;

3 Bosish pistonining maydoni va diametri

F=
F= =1120 sm2;


d=
d= 38 sm;

4 To'ldirish ramkasining balandligi

h=
h= 4,3 sm;

5 Biz press mexanizmining indikator diagrammasini quramiz (18.1-rasmga qarang)

1-bandda
P_bitta=1+
P_bitta=1+ =1,64 atm


S_bitta=S0=4,0 sm;

2-bandda
P₂=P1=1,64 atm

S₂=S0+z
S₂=4,0+2,0=6,0 sm (z=2 sm);

2a nuqtada

P_2a=P2+
P_2a= 1,68 atm


S_2a=S2=6,0 sm;

3-bandda
P₃=P2+

P₃= 6,7 atm


S₃=S0+z+h
S₃\u003d 4,0 + 2,0 + 4,3 \u003d 10,3 sm;
n1 va n2 oraliq nuqtalarda


=1,35 g/sm3;


=1,5 g/sm3;
3,42 atm;


2,07 atm;

Sn1=S0+z+hn1=4+2+1,4=7,4 sm;

Sn2=S0+z+hn2=4+2+2,8=8,8 sm;

4-bandda
P_to'rtta=1+

P_to'rtta=1+ =1,38 atm


S_to'rtta=S3=10,3 sm;
5-bandda
P₅=P4=1,38 atm


S₅=S1=4 sm;

6 Siqilgan havo iste'moli ko'rsatkichi

V=F(S+S0)(P0+1)–V0*10–6

V=[1120(6,3+4)(6+1)–1120*4]*10–6=0,076 m3.

1 - surish plitasi;
2 - ramkani to'ldirish;
3 – qoliplash qumi;
4 - model;
5 - kolba;
6 - press stoli;
7 - piston;
8 - silindrli korpus.

18.1-rasm - Pnevmatik pressning hisobiga

kalıplama mashinasi
19 Tutqichli pressli qoliplash mashinasini hisoblash


Mashq qilish.Kerakli bosish kuchini, shuningdek, yuqori solishtirma bosim ostida bosish orqali quyma qoliplarni tayyorlash uchun mo'ljallangan BIF-1 tipidagi tutqichli presslash mashinasining dizayn parametrlarini aniqlang.
Dastlabki ma'lumotlar.Kolbalar hajmi A0V0H0=450350120 mm. Modelning o'lchamlari AmVmHm=25020062 mm. Aralashmaning dastlabki zichligi 1,2 g / sm3 ni tashkil qiladi. =1,7 g/sm3 ko’rinishdagi aralashmaning berilgan zichligi.
Yechim.
1 To'ldirish ramkasining balandligi


h=
h= =4,25 sm;

2 Mog'orning pastki qatlamlarida aralashmaning kuchlanishi

kg/sm2;
3 C hajmining yuqori qismlarida aralashmaning kuchlanishi (19.1-rasm)

bu yerda Hm=6,2 sm; =0,5; f=0,7;

U=2(A0+B0+Am+Vm)=2(45+35+25+20)=250 sm;

F=F0–Fm=45*35–25*20=1080 sm2;

kg/sm2,

4 B hajmidagi aralashmaning kuchlanishi

bunda k=0,2; =30;

=19,7 kg/sm2,

5 A hajmdagi aralashmaning tarangligi

60 kg/sm2;

6 Bosish kuchi

Ppr=1Fm+3(F0–Fm)+ 2*f*2(A0+B0)(H0–Hm)

Ppr \u003d 60 * 500 + 6,32 (1580–500) + + 19,7 * 0,7 * 2 (45 + 35) (12-6,2)
50000 kg=50 tonna;

7 Silindrni bosish kuchi

P_c=

bu yerda =10; =5;

P_c= kg,

8 Silindr diametrini bosish

d=
d= sm;

Biz d=250 mm qabul qilamiz.

Shakl 19.1 - Tutqich-press qolipini hisoblash uchun
avtomobillar