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C S CNG NGHGIA CNG CT GT
TRN MY CNC
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Ni dung
C bn v ct kim loi
Tin
Phay
Khoan, khot, doa, taro
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1. Cn bn v ct kim loi
Ct kim loi l g?
Thng s hnh hc ca li ct
Vt liu ch to dng c ct
Cc nhn t nh hng n lc ct
Cc nhn t nh hng n nhm b mt gia
cng
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Ct kim loi l g?
L qu trnh bc ra khi mt gia cng mt lp kimloi bi mt dng c ct c cng cao hn vtliu gia cng.
Vt liu ct thng lm t thp gi, hp kimcng, vt liu gm, Nitride bor lp phng, Kimcng
Vt liu gia cng thng l: Thp, thp khng g,gang, ng, nhm,
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VT LIU KIM LOI
Chia ra lm bn nhm:
Thp carbon
Thp inoxGang
Cc kim loi khc
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Nhm vt liu l thp
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Nhm vt liu l thp inox
Nhm vt liu l gang
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Nhm vt liu khc kim
loi en
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K hiu thp theo tiu chun cc nccng nghip pht trin
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K hiu thp theo tiu chun cc nccng nghip pht trin
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K hiu thp theo tiu chun cc nccng nghip pht trin
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K hiu thp inox theo tiu chun
cc nc cng nghip pht trin
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K hiu thp inox theo tiu chun
cc nc cng nghip pht trin
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K hiu gang theo tiu chun
cc nc cng nghip pht trin
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Tin
Phay
Khoan
Cc phngphp ct in
hnh
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Thng s hnh hc ca li ctGc trc
Gc sau
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Cac thong so hnh hoc cua li cat
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Cac thong so hnh hoc cua li cat
Goc sau :Goc sau lam giam ma sat va s nong len gia chi tiet
va dung cu cat. Goc sac :Kich thc cua goc sac phu thuoc vao o cng va o
deo cua chi tiet gia cong. Goc sac nho khi lc cat nho va goc cat
ln khi lc cat ln, tuy nhien goc sac ln lam tang s mai mon
li cat va tuoi tho cua li cat thap.
Goc trc :Goc trc co anh hng en qua trnh tao phoi va
lc cat. Goc trc cang ln th lc cat cang nho, tuy nhien li cat
de b v va b mai mon nhanh. Nhng vat lieu ran, tng oi cngthng s dung goc trc khoang 10o. Nhng vat lieu cng va gion
oi hoi goc trc nho tham ch la goc am.
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Cac thong so hnh hoc cua li cat
Goc lech chnh : Goc lech chnh co anh hng en lc cat va lc
kep chi tiet cung nh chieu sau va be rong cat. Thng chon goc
lech chnh t 30oen 60och khi tien vai hay cat t chon goc lech
chnh = 90o.
Goc nghieng : Thng chon goc nghieng am khi tien tho va goc
nghieng dng khi tien tinh. Goc nghieng am c s dung e giam
ng suat cua li cat va goc nghieng dng c s dung e be
phoi trc tiep t chi tiet gia cong.
Goc mui dao : Goc mui dao cang ln cang lam tang o cng
vng cua li cat va tan nhiet tot hn.
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Vat lieu li cat
- Li cat thep gio
- Li cat hp kim cng
- Li cat vat lieu gom
- Nitrid Bore lap phng
- Li cat kim cng
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Thep gio(HSS)
Thep gio la mot loai thep hp kim dung cu. cng 65HRC.No co o ben nhiet cao (605oC), v the no co the chu tac ong
cua tai trong ln. Toc o cat nho hn so vi hp kim cng va vat
lieu gom.
Thep gio thng dung e che tao dung cu cat nh hnh v du nhli khoan va dao doa, khong cho phep dung lam cac manh li cat
hay gia cong chat deo va hp kim nhe. Cac dung cu cat thep gio
thng c ma mot lp titan-nitrc (TiN). Lp phu co mau vang
nay lam tang o cng toi a, chong lai s mai mon va cho phep
toc o cat cao hn.
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Hp kim cng.
Hp kim cng la nhng vat lieu c che tao bang phng phapluyen kim bot nh la nhng manh li cat s dung vat lieu toi va
mot tac nhan lien ket. Trong hau het cac trng hp vat lieu toi
la cacbit vonfam, titan hay tantal. Coban c s dung nh la tac nhan
lien ket.
Hp kim cng co o cng ln hn nhieu so vi thep gio 70HRC)
. Hp kim cng co kha nang chong lai s mai mon toi a va chu
ng c nhiet o gia cong cao. Tuy nhien o chu dao ong nhiet
va o ben th kem hn so vi thep gio.
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Qu trnh sn xut hp kim cng
To btW v C
Trn btW v C
Nung bt W v C trong
l cao tn to WC
p nh hnhWC tm thi vi
50% l hng
Trn WCvi Co
Thiu kt WC vi
Co 1600oC
Mi ng
kch thcPh lp Ti(CN)hay Al2O3
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Hp kim cng
Hp kim cng c phn theonhm vt liu gia cng
Nhm P: gia cng ch yu lthp
Nhm M: gia cng ch yu lthp khng r
Nhm K: gia cng ch yu lgang
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Cp cng ca mnh hp kim
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Gia cng th
Gia cng bn tinh
Gia cng tinh
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Hp kim cng.
Nhom cat
chnh
Nhom ng dung
Kyhieu Vat lieu ng dung
P01Tien sieu tinh, chatlng bemat cao.
Chong lai s maimon cao.Toc ocat cao
P10
Gia cong tinh, toc
ocat cao.P P20 Thep
Xanh P30 Toc o cat trungbnh.
P40 Gang deo ocng cao.
P50 Gia cong tho. Lng tien dao
nhanh
M10Gia cong tinh, tococat cao.
Chong lai s maimon cao.Toc ocat cao
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Hp kim cng.
M10Gia cong tinh, tococat cao.
Chong lai s maimon cao.
Toc ocat caoM M20 Thep khong r Toc o cat trung
bnh.
Vang M30
M40 Kim loai mau Gia cong tho. ocng cao.
Lng tien daonhanh
K01 Gang cng Gia cong tinh.Chong lai s maimon cao.Toc ocat cao
K K10 Gang
o K20 Gang deo
K30 Nha
K40 Go Gia cong tho. ocng cao.Lng tien daonhanh
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Vat lieu gom (s)
Vat lieu gom cng hn hp kim cng (o cng 92-93HRC)va cho phep nhiet o lam viec len en 1200 oC.
Chung rat gion, de v va nhay cam vi s dao ong cua
lc cat.
Vat lieu gom c che tao di dang manh hp kim vac kep tren can dao giong nh manh hp kim cng.
Tuoi ben dao s gap hai lan hp kim cng
Toc o cat gap hai lan so vi hp kim cng
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Vat lieu gom.
Vat lieu gom c s dung trong cac qua trnh cat got
on nh, khong can ti nguoi. Vat lieu gom ly tng
e cat cac vat lieu sat v chung khong tao ra hien tng
phoi bam. Vat lieu gom co the c phan loai theo 3
nhom sau:
- Vat lieu gom oxit
- Vat lieu gom hon hp
- Vat lieu gom nitrid
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Vat lieu gom oxit
Vat lieu gom cha oxit nhom (Al2O3 ) nguyen chat c goi
la vat lieu gom oxit,
Chung khong dung kim loai lam tac nhan lien ket. Vat
lieu gom oxit at biet ly tng e cat cac hp kim sat vco kha nang chong lai mai mon cao.
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Vat lieu gom
Hp kim cng c cho them vao oxit nhom (Al2O3 ) v du nh cacbit
titan, goi la vat lieu gom hon hp. Vat lieu gom hon hp cdung e gia cong tinh gang xam hoac thep cung nh dung e cat
cac vat lieu sat a toi.
Vat lieugom nitridco thanh phan chnh la silic nitrid (Si3N4 ). Vat lieu
cat khong co oxit nay rat gion va nhay cam vi s thay oi nhieto cat. Nhc iem la khong co kha nang chu mai mon cao khi
cat thep. Vat lieu gom nitrid c ng dung e gia cong gang xam.
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Kim cng
Kim cng cng hn tat ca cac vat lieu cat khac. (7000-8000 HK =
70000-80000 HB). Chung rat nhay cam vi va cham, tuy nhien khong
tao ra hien tng phoi bam trong qua trnh gia cong.
Kim cng c s dung e cat kim loai mau va hp kim cua kim loai
mau cung nh dung e cat vat lieu composit, hp kim cng va vat
lieu gom.
Kim cng khong c dung e gia cong thep. Bi v kim cng se b
mon rat nhanh do nguyen t cacbon cua kim cng phat ra va nhap
vao nguyen t sat (s mai mon ngc).
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Khi nhiet o tang th o cng cua vat lieu cat giam
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o dai va o cng
cua cac loai vat lieu cat
o
cng
o dai
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Manh li cat bang
hp kim cng, gom va kim cng
Manh li cat c phan loai theo cac ac iem cban cua chung nh hnh dang, goc, li cat, mc ochung cung nh thiet b dung ekep vacac kch thcchnh. Da tren tieu chuan ISO 1832 / DIN- 4987 v dusau minh hoa ten tieu chuan cua mot manh li cat.
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Manh li cat ISO 1832 - ECMT 09 T3 08 FR - P10
Kyhieu V du
Sotieu chuan DIN 4987
1) Hnh dang c ban E = hnh thoi 75o
2) Goc sau C = 7o
3) Cap chnh xac M4) Bemat vaac iem kep T goc vat cua bemat lo
kep = 60o
5) Kch thc manh li cat Chieu dai canh = 9,52 mm
6) Chieu day manh li cat s = 3,97mm
7) Ban knh li cat r = 0,8mm8) ac iem li cat F = li cat sac
9) Hng cat R = ben phai
10) Vat lieu li cat Hp kim cng P10
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nh hng n lc ct
Lc ct chu nh hng ca:
1. Phng php ct
2. Vt liu li ct
3. Hnh hc li ct
4. Dung dch trn ngui
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nh hng ca vt liu ti lc ct
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Mnh hp kim m v dng
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Positive StyleNegative Style Single sided Low cutting forces Side clearance
Internal machining Slender shafts
Double sided Edge strength External machining
Heavy cutting conditions
Negative vs. Positive Inserts
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Gc trc m v dng
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nh hngca gc trc
ti lc ct
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Phn b nhit ct
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Cc dng phoi
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Nhn bit gcnghing chnh
Krtheo hngchy dao (fn)
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Workpiece
Toolholder
ISO Standard
Entering angle95 degrees
Gc nghing ca lict chnh
C d fil l i t
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Cc dng profil ca li ct
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Bn knh u dao v s hnh thnh nhm b mt gia cng
B k h d h
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Bn knh u dao v sc chu ng
h b t i h th b
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nhm b mt gia cng ph thuc vo bnknh u dao v lng chy dao
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Turning
Wipers
Wiper insert
Twice the feed, same Ra
apRa
Ra
fn
fn
2 x fn
r
(w)Ra2
r
(w)
r
Traditional insert
Wiper insert
Half Ra, same feed
Ci thin nhm bng cch tng rng mi dao
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2. TIN
Cac dang chi tiet co the gia cong tren may tien
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Cac dang chi tiet co the gia cong tren may tien
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May tien ngang
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May tien ng va tien cut
C h h h
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Cac thanh phan cua may tien
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May tien van nang va may tien CNC
May tien CNC
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y
May tien: Mo phong qua trnh gia cong tren may tnh
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y p g q g g y
May tien: Mo phong qua trnh gia cong tren may tnh
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y p g q g g y
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Cac loai dao tien
V d k h d
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V du ky hieu mot can dao tien
V d k hi d i
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Vdu ky hieu mot can dao tien
V d k hi d i
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V du ky hieu mot can dao tien
V d k hi t d ti
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V du ky hieu mot can dao tien
V d k hi t d ti
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V du ky hieu mot can dao tien
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Cap toc truyen momen xoan cho truc gia cong
Dung luynet khi l/d > 5
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Mi chng tm xoay
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Dung mui tam khuyet
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Dung Luynet ong va tnh (khi l/d >12)
C i ti i
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Cc s gia cng: tin ngoi
C i ti t
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Cc s gia cng: tin trong
C i ti h
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Cc s gia cng: tin rnh
C i ti h
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Cc s gia cng: tin rnh
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Cc s gia cng: tin ren
Ch h h
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Chn ch cng ngh
Ch cng ngh Gm cc yu tChiu su ct
Lng n dao
Vn tc ct
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Chiu su ct
Chn tu thuc vo nhiuyu t cng ngh: Cngsut my, cng vng
ca h thng My- g-dao-chi tit gia cng.
Chiu su ct nh nht
khng c nh hn bnknh mi dao.
Lng n dao
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Lng n dao
Rz Rz
V t t
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Vn tc ct
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Vn tc ct v s vng quay
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Cng sut ct
Cap chnh xac kch thc, o nham
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Cap chnh xac onham bemat, (m)Chieu sau lp
bien cng, mGhi chu
Phng phap gia cong
Kinh te at c Ra Rz T
(1) (2) (3) (4) (5) (6) (7)
Pha 15 - 17 - 25 - 100 100 - 400 350
Na tinh 12 - 14 - 6,3 - 12,5 25 - 50 50
Tinh 7 - 9 6 1,6 - 3,2 6,3 - 12,5 10Tien doc
Mong 6 5 0,4 - 0,8 1,25 - 3,2 5
Pha 16 - 17 25 - 100 100 - 400 350Na tinh 14 - 15 6,3 - 12,5 25 - 50 50
Tinh 11 - 13 8 - 9 3,2 - 6,3 12,5 - 25 25Tien ngang
Mong 8 - 11 7 0,8 - 1,6 3,2 - 6,3 10
d 15mm 12 - 14 10 - 11 6,3 - 12,5 25 - 50 25 - 50Khoan
d > 15mm 12 - 14 10 - 11 12,5 - 25 50 - 100 50 - 100
Tho 12 - 15 - 12,5 - 25 50 - 100 50 - 100Xoay
Tinh 10 - 11 8 - 9 3,2 - 6,3 12,5 - 25 20
Na tinh 9 - 10 8 6,3 - 12,5 25 - 50 50
Tinh 7 - 8 - 1,6 - 3,2 6,3 - 12,5 10Doa
Mong 7 6 0,4 - 0,8 1,25 - 3,2 5
Cong thc tnh chnh xac, che o gia cong trung bnh
va cong thc tnh gan ung thi gian may
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Phng phap gia congCong thc lythuyet
tnh TM, (phut)
Cheogia cong trung
bnh thng gap
Cong thc ganung tnh TM,
(phut)
Tho V = 105 m/ph; S = 0,4 mm/vg 0,000075DlTien an
dao doc Tinh VS1000
Dl
V = 120 m/ph; S = 0,15 mm/vg 0,0000175Dl
Tho V = 70 m/ph; S = 0,5 mm/vg 0,0000224(D
2d
2
)Tien andao
ngangTinh VS4000
)dD( 22
V = 174,6 m/ph; S = 0,41 mm/vg 0,000011(D2d2)
Tho V = 63,4 m/ph; S = 0,36 mm/vg 0,000134 DlTien lo
Tinh V = 50 m/ph; S = 0,15 mm/vg 0,00042 Dl
3. PHNG PHAP PHAY
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Kha nang cong nghe Cac dang mat co the gia cong bang phng phap
phay
Mat phang
Mat ranh
Mat cong
Mat lo tru
Mat ren
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My phay
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My phay
My phay ging
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My phay ging
G DNG TRN MY PHAY
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94
G DNG TRN MY PHAY
G DNG TRN MY PHAY
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95
G DNG TRN MY PHAY
G DNG TRN MY PHAY
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96
G DNG TRN MY PHAY
to kp bng kh nn
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97
to kp bng kh nn
Bn g nghing
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98
Bn g nghing
Bn g dch chuyn theo hai phng
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99
Bn g dch chuyn theo hai phng
G DNG TRN MY PHAY
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100
G G
G DNG TRN MY PHAY
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101
CC LAI DAO PHAY
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Dao phay mt u
Dao phay a Dao phay mt bc
Dao phay ngn
Cc dng chuyn ng ct khi phay
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Chiu dy ct dc apv ngang ae
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p
Lng n dao rng fz
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Chn dao, mnh hp
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kim v ch ct
1. Chn kiu dao2. Chn ng knh daotheo k hiu 2a trong bng trang sau
3. Chn mnh hp kim theok hiu 3a, 3b trong bng trang sau)
4. Chn ch ct theo cck hiu 4a, 4b, 4c. 4d trongcc bng cc trang sau
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Xc nh cng sutkhi phay mt u
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khi phay mt u
Vf = fz x n x zn
Cap chnh xac kch thc, o nham
C h h h b t ( )Chieu sau lp
Ghi h
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Cap chnh xac onham bemat, (m)p
bien cng, mGhi chu
Phng phap gia cong
Kinh te at c Ra Rz T
(1) (2) (3) (4) (5) (6) (7)
Tho 12 - 14 - 25 - 50 100 - 200 100 - 200
Tinh 11 - 3,2 - 6,3 12,5 - 25 12,5 - 25Phay tru
Mong 8 - 9 6 - 7 1,6 6,3 10
Tho 12 - 14 6,3 - 12,5 25 - 50 25 - 50
Tinh 11 10 3,2 - 6,3 12,5 - 25 15 - 30Phay mat
au
Mong 8 - 9 6 - 7 0,8 - 1,6 3,2 - 6,3 5 - 10
Cong thc tnh chnh xac, che o gia cong trung bnh
va cong thc tnh gan ung thi gian may
Phng phap gia congCong thc lythuyet
tnh TM, (phut)
Cheogia cong trung
bnh thng gap
Cong thc gan
ung tnh TM,
(phut)
Tho SM= 150 mm/ph 0,00666 l
Tinh SM= 285 mm/ph 0,00352 lPhaybang dao
phay tru Mong SM= 600 mm/ph 0,00166 l
Tho SM= 170 mm/ph
Tinh SM= 208 mm/ph
Phay
bang dao
phay mat
au Mong
l/SM
SM= 351 mm/ph 0,00285 l
4 PHNG PHAP
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4. PHNG PHAP
KHOAN, KHOET, DOA VA TA RO
PHNG PHAP KHOAN KHOET
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PHNG PHAP KHOAN, KHOET
Kha nang cong nghe
Cac dang mat co the gia cong bang phng phap
KHOAN, KHOET Mat tru trong
Mat lo trc khi lam ren
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Solid
Crowloc
Mi khot
Chn li khoan
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Lc v cng sut ct khi khoan bng
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g gmi khoan lin khi (solid drill)
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Lc khoan, mmen xon, cng sut v lulng dung dch trn ngui khi khoan
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D
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Doa
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Taro hay phay ren
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y p y
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Tnh lc khoan
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hay phay m
dao thng ng
Cap chnh xac kch thc, o nham
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Cap chnh xac onham bemat, (m)
Chieu sau lp
bien cng, m Ghi chuPhng phap gia cong
Kinh te at c Ra Rz T
(1) (2) (3) (4) (5) (6) (7)
d 15mm 12 - 14 10 - 11 6,3 - 12,5 25 - 50 25 - 50Khoan
d > 15mm 12 - 14 10 - 11 12,5 - 25 50 - 100 50 - 100
Tho 12 - 15 - 12,5 - 25 50 - 100 50 - 100Xoay
Tinh 10 - 11 8 - 9 3,2 - 6,3 12,5 - 25 20
Na tinh 9 - 10 8 6,3 - 12,5 25 - 50 50
Tinh 7 - 8 - 1,6 - 3,2 6,3 - 12,5 10Doa
Mong 7 6 0,4 - 0,8 1,25 - 3,2 5
Cong thc tnh chnh xac, che o gia cong trung bnh
th t h th i i
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va cong thc tnh gan ung thi gian may
Phng phap gia congCong thc lythuyet
tnh TM, (phut)
Cheogia cong trung
bnh thng gap
Cong thc gan
ung tnh TM,
(phut)
D 20 V = 22,4 m/ph; S = 0,25 mm/vg 0,00056 DlKhoan lo
D = 20...70V = 29,7 m/ph
S = 0,25 mm/vg0,000423 Dl
Khoet (xoay) lo V = 15m/ph; S = 1 mm/vg 0,00021 Dl
Tho V = 12 m/ph; S = 0,6 mm/vg 0,000436 DlDoa lo
tinh V = 6 m/ph; S = 0,6 mm/vg 0,000376 Dl
Tho V = 63,4 m/ph; S = 0,36 mm/vg 0,000134 DlTien lo
Tinh
VS1000
Dl
V = 50 m/ph; S = 0,15 mm/vg 0,00042 Dl
TM LC
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Ct kim loi l g? C nhng vt liu gia cng no?vt liu ct g?
Cc yu t nh hng ti lc ct v nhm?
Tin l g? Tin c kh nng g? C nhng loi my tin g?
g trn my tin ?
Dng d ct trn my tin?
Ch ct trn my tin?
TM LC
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Phay l g? Phay c kh nng g? C nhng loi my phay no?
g trn my phay ?
Dng d ct trn my phay?
Ch ct trn my phay?
Khoan, khot, doa, ta ro l g?
Dng c ct cho khoan, khot, doa, ta ro
Ch ct khi khoan, khot, doa, ta ro