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che do cat tren may 4 truc
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KS.Hong Vn Thiu TNH TON CH CT TRONG GIA CNG 4 TRC
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Ch ct trong gia cng 4 trc tnh ton nh th no?
Trn l mt s hnh nh m phng gia cng trn my tnh v sn phm gia
cng thc t
Mnh s i ngay vo gii thch cch tnh ton ch ct trn my 4 trc v c
th y l trc A cc trc cn li ta ng dng tng t
(mnh cng mi nghin cu nu c cch no hay hn mong anh em ng o
ch gio c m rng tm mt)
Chng ta bt u cc bn
KS.Hong Vn Thiu TNH TON CH CT TRONG GIA CNG 4 TRC
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My phay ng 4 trc
My phay nm ngang 4 trc (trc B)
KS.Hong Vn Thiu TNH TON CH CT TRONG GIA CNG 4 TRC
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Ta v d cn gia cng chi tit trn my phay ng 4 trc (trc A) nh sau
Trng hp 1 chi tit quay 360 quanh trc X dao khng di chuyn
Chi tit ca ta ng knh D=200mm, tc ct f=150mm/min
1. 1 vng quay thc t ca chi tit tc l dao di chuyn c qung ng bng chu vi chi tit l L=xD=3.14x200=628mm
2. Thi gia gia cng T=L/F=628/150=4.19min 3. Theo nh tnh ton c li khong cch di ng theo 1 phng NC k
hiu l LNC=360= 360mm (ci ny mnh cha r lm mnh s tm
hiu phn sau nh) xem nh n l ng
4. Tc ct thc t s l F=LNC/T= 360/4.19=86
Tc l ta ghi A360F150 th thc t l A360F86 vy ta c cng thc chung
cho tnh ton trong trng hp ny l
F= { 360/ (xD) } x f
F; l tc di chuyn cn thit ti v tr ct
KS.Hong Vn Thiu TNH TON CH CT TRONG GIA CNG 4 TRC
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D; l ng knh chi tit
Trng hp 2
Ta cn gia cng 1 rnh trn trc nh hnh trn trng hp ny c s gia
cng phi hp 2 trc A v X chi tit ng knh 200 phay rnh su -5mm
Gi s ti v tr xung dao khoan l sn
Mnh s vit 1 on chng trnh ng dng trn my okuma theo G90
G90
KS.Hong Vn Thiu TNH TON CH CT TRONG GIA CNG 4 TRC
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G90G0X70.Y0.A0S800
G56 Z120.H1M3
G1 Z95.F80
X110 A315 F..M16 ( quay ngc chiu kim ng h)
Vit theo G91
G90 G0X70.Y0.A0S800
G56 Z120.H1M3
G1Z95F80.
G91X40.A-45.F.( vi G91 th A- l quay ngc chiu kim ng h)
trng hp trn th t ct nh th no
D=200mm
A=45
X=40mm trong trng hp mun di chuyn ng thi 2 trc vi vn tc
f=150mm/min
1. C li di chuyn thc t khi ct gt trn phi l
L= = (3.14 200 45/360) + 40=88.1mm
2. Thi gian gia cng T trn qung ng 88.1mm ng vi vn tc f=150mm/min l T=L/f =88.1/150=0.59min
3. C li Lnc di ng tnh ton l
Lnc=a + x=45 + 40=60.2mm
KS.Hong Vn Thiu TNH TON CH CT TRONG GIA CNG 4 TRC
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4. Tc F di chuyn ton b trong qu trnh gia cng l F=Lnc/T= 60.2/0.59=102
Vy ta c cng thc chung tnh tc tin dao F trong trng hp ny l
Vi f l tc di chuyn cn thit ti v tr ct
D l ng knh chi tit
A l gc lch
X l lng di chuyn theo phng trc X nh trn
Trng hp a=360v x=0 th tr v trng hp 1 ta s tr li c thc
mc phn trn Lnc=360=360mm (1mm/min=1deg/min)
Hi rc ri cht nhng ta chu kh suy ngh cht th n c lin quan n
cc i lng ton hc vt l, qung ng, vn tc, thi gian
Chc cc bn cui tun vui v