cong nghe che tao may 2
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CNG NGH CH TO MY II
TRNG I HC KINH T K THUT CNG NGHIP
KHOA C KH
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Cng ngh ch to my II
CHNG III CH TO CHI TIT DNG HP
2
CHNG 6 : CH TO CHI TIT DNG BC
6.1 Cu to chi tit dng bc
6.2 Ch ct
6.3 Trnh t gia cng
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Cng ngh ch to my II
CHNG VI CH TO CHI TIT DNG BC
3
6.1 Cu to chi tit dng trc
6.1.1 M u- Bc l nhng chi tit ngtrn , thnh mng, mt u cvai hoc khng c vai, mttrong l mt tr hoc mt cn,c th l bc nguyn hoc cx rnh.- Cng dng: Dng nngcao tui th cc thit b ckh. Chng thng cdng lm chi tit lt , chumi mn cao v quan trngnht l n c th d dng thayth c.
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Cng ngh ch to my II
CHNG VI CH TO CHI TIT DNG BC
4
V mt kt cu
Phn loi
Loi bc trn khng c g (hnh a)Loi bc c g hoc c mt bch (hnh b,c)Loi bc c l hnh cn (hnh d) ;Loi bc cc y kn (hnh e)Loi bc cc y c l (hnh f) ;Loi bc cc c vai y kn (hnh g)Loi bc cc c vai y c l (hnh h)
a) b) c) d)
g)f)e) h)
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Cng ngh ch to my II
CHNG VI CH TO CHI TIT DNG BC
5
Da vo my gia cng cc nguyn cng chnh
Di 25mm; 25-32; 32-40; 40-50; 50-65; 65-100
Ch :
c trng quan trng v kch thc ca bc l t l gia chiu di vng knh ln nht ca chi tit. T l ny thng nm trong khong0,5-3,5.
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Cng ngh ch to my II
CHNG VI CH TO CHI TIT DNG BC
6
6.1.2 C TNH K THUTKhi ch to chi tit dng bc th yu cu k thut quan trng nht l ng tm ca mt ngoi v mt l v vung gc gia mt u vng tm l.
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Cng ngh ch to my II
CHNG VI CH TO CHI TIT DNG BC
chnh xc bn thn cc b mt:
ng knh mt ngoi ca bc t chnh xc cp 710. Nhm b
mt Ra = 2,5m.
ng knh l t chnh xc cp 7, i khi l cp 10. i vi cc l bc
cn lp ghp i hi chnh xc ti cp 5. Nhm b mt Ra = 2,50,63m,
i khi Ra = 0,32m.
Vi mt u Rz= 4010 m, i khi Ra= 2,5 m.
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Cng ngh ch to my II
CHNG VI CH TO CHI TIT DNG BC
khng ng tm gia mt ngoi v mt l bc tu tng iu kin
lm vic m quy nh c th. Thng thng khng ng tm ny
khng ln hn 0,15mm.
chnh xc v trtng quan gia cc b mt.
khng vung gc gia mt u v ng tm l nm trong
khong 0,10,2 mm/100 mm bn knh. Vi loi bc chu ti trng
theo chiu trc th khng vung gc ny l 0,020,03 trn 100
mm bn knh.
dy thnh bc cho php sai lch trong khong 0,030,15 mm.
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Cng ngh ch to my II
CHNG VI CH TO CHI TIT DNG BC
9
6.1.3 TNH CNG NGH
- c trng quan trng v kch thc ca bc l t l gia chiu di v
ng knh ln nht ca chi tit. T l ny thng nm trong khong
0,5-3,5.
T l ny nhm m bo s cn i v kch thc v hp l v hnh dng.
- Ch n kch thc ca l bc v mt l thng gia cng kh ln mt ngoi.
- B dy ca bc cng l mt c im cn lu khi gia cng chi tit. V nu bc mng qu th khi gia cng v nhit luyn s b cong vnh.
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Cng ngh ch to my II
CHNG VI CH TO CHI TIT DNG BC
10
6.1.4 VT LIU CH TO
- Vt liu ch to chi tit dng bc c th l thp, ng thau,
ng , gang v cc hp kim c bit khc.
- Ngoi ra c th dng cht do, gm s, kim loi bt ch
to mt s dng bc chuyn dng.
vd : nh ng xilanh ca ng c t trong dng gang xm
GX21-40
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Cng ngh ch to my II
CHNG VI CH TO CHI TIT DNG BC
Phi v phng php ch to phi:
Vic chn phi ch to cc chi tit dng bc ph thuc vo iu
kin lm vic, hnh dng v sn lng ca n:
Vi bc c D < 20 mm thng dng phi thanh nh hnh, hoc
phi thanh cn nng hoc phi c c.
Vi bc c D > 20 mm thng dng phi ng hoc phi c c
l sn.
Tu theo sn lng v yu cu k thut cng nh iu kin sn
xut m c th c trong khun ct lm khun bng tay, bng my
hoc c th c trong khun kim loi, c ly tm hay c p lc.
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Cng ngh ch to my II
CHNG VI CH TO CHI TIT DNG BC
Bc c thnh mng v x rnh thng to phi t ng thanh,
ng , cng c khi dng phi t tm kim loi un thnh bc.
Bc bng vt liu s, cht do, kim loi bt thng to phi bng
cch p trong khun v sau em thiu kt. Nhng phi p v c
trong khun kim loi vi p lc c th to sn l nh ti 3 mm hoc
nh hn na.
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Cng ngh ch to my II
CHNG VI CH TO CHI TIT DNG BC
13
6.2 Ch ct
- Chiu su ct t
- Lng chy dao S
- Vn tc ct V
Ch ct c tra trong cc s tay cng ngh CTM ca nh sutbn khoa hc v k thut, Ch bin: GS.TS Nguyn c Lc
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Cng ngh ch to my II
CHNG VI CH TO CHI TIT DNG BC
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6.3 Trnh t gia cng chi tit dng bc
6.3.1 Chun nh v gia cng chi tit dng bc
6.3.2 Trnh t gia cng cc b mt ch yu
6.3.3 Bin php thc hin cc nguyn cng
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Cng ngh ch to my II
CHNG VI CH TO CHI TIT DNG BC
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6.3 Trnh t gia cng chi tit dng bc
6.3.1 Chun nh v gia cng chi tit dng bc
V yu cu v ng tm ca mt ngoi vi mt l; vung gc gi mt u vi ng tm do chun nh v l mt ngoi hoc mt l.
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Cng ngh ch to my II
CHNG VI CH TO CHI TIT DNG BC
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1. Gia cng tt c cc mt ngoi, l v mt u ca bc trong mt ln g
a) b)
c)
L L
Chi tit c nh v 4 bc t do bng mm cp 3 chu. Phngphp ny ch p dng cho sn xut n chic
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Cng ngh ch to my II
CHNG VI CH TO CHI TIT DNG BC
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2. Gia cng tt c cc mt chnh sau hai ln g t.
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Cng ngh ch to my II
CHNG VI CH TO CHI TIT DNG BC
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3. Gia cng tt c cc mt chnh sau ba ln g t.
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Cng ngh ch to my II
CHNG VI CH TO CHI TIT DNG BC
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4. Gia cng tt c cc mt chnh sau bn ln g t
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Cng ngh ch to my II
CHNG VI CH TO CHI TIT DNG BC
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1. Gia cng cc b mt chnh ca bc (mt ngoi, l, mt u).
2. Khoan cc l ph.
3. Gia cng cc mt nh hnh.
4. Nhit luyn : Gia cng tinh cc l v mt ngoi.
5. nh bng nhng b mt c yu cu bng cao
6. Kim tra.
6.3.2 Trnh t gia cng.
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Cng ngh ch to my II
CHNG VI CH TO CHI TIT DNG BC
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6.3.3 Bin php thc hin cc nguyn cng chnh.
1. Gia cng cc bc t phi thanh.
Xn mt u, Tin ngoi, Khoan mi, Khoan l, Tin trong, Ct t
1) 2)
Ln g A
Chi tit Bc
Rz4060
55
2,5
55
25
45
55
40
2x45
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Cng ngh ch to my II
CHNG VI CH TO CHI TIT DNG BC
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40
4
560
2
2
58
2
5
3) 4) 5)
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Cng ngh ch to my II
CHNG VI CH TO CHI TIT DNG BC
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Cng ngh ch to my II
CHNG VI CH TO CHI TIT DNG BC
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Nu bc dng cc y kn hoc h. cn c vung gc ca mt g cc v tm th ta phi tin rng l nh hnh bn
A
a)
b)
c)
l
L
Du
l
L
A C t
phng
l
L
Con ln
Nguyn cng I
1)
2)
3)
L
a
4)
5)
6)
Nguyn cng II
L
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Cng ngh ch to my II
CHNG VI CH TO CHI TIT DNG BC
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Sn xut lot ln vhng khi thc hin trnmy revolve
- Xn mt u, - y phi thanh ti c t - khoan l, - tin mt tr ngoi, - vt mp,
- doa th,
- doa tinh l v ct t
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Cng ngh ch to my II
CHNG VI CH TO CHI TIT DNG BC
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Bin php gia cng cc mt chnh ca bc ch to t phi ng c bn
ging nh i vi cc bc ch to t phi thanh, nhng phi thay
nguyn cng khoan bng nguyn cng khot v doa l.
2. Cc bc ch to t phi ng.
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Cng ngh ch to my II
CHNG VI CH TO CHI TIT DNG BC
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Nu sn lng thp, bc c nh c th gia cng cc mt chnh trn
my tin vn nng thng thng. Mt ln dng l lm chun tinh gia
cng mt tr ngoi hoc dng mt ngoi lm chun tinh gia cng l.
3. c v rn n chic.
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Cng ngh ch to my II
CHNG VI CH TO CHI TIT DNG BC
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TH1: i vi bc hnh ng h hai u c th dng trc g ; ngoi ra c th dng ng kp n hi v trc g n hi
3. c v rn n chic.
Trc g
Phi
1
Phi
Cn mooc s 5
3
2
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Cng ngh ch to my II
CHNG VI CH TO CHI TIT DNG BC
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TH2: i vi bc hnh cc y kn cng dng trc g nhng kt cu khc
1 2 3 4 5 6 7
PhiCn mooc s 5
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Cng ngh ch to my II
CHNG VI CH TO CHI TIT DNG BC
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TH3: Bc c thnh mng, khi gia cng cn ch ti s bin dng ca cc thnh mng do lc kp ca cc chu kp gy ra sau khi gia cng xong, l bc thng b mo. Khc phc: dng cc chu kp c m kp rng, di hoc dng cc ng kp n hi.
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Cng ngh ch to my II
CHNG VI CH TO CHI TIT DNG BC
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Hoc Kp cht bng kh nn
Trc g kh nnng kp kh nn
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Cng ngh ch to my II
CHNG VI CH TO CHI TIT DNG BC
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Nhng bc c l cn thng c khot v doa bng dao hnh cn.
Nhng bc c mt lp kim loi chng mn (bc hai lp) th sau khi
gia cng tinh l, tin hnh c hoc p lp hp kim trn mt l, sau
gia cng tinh li trn lp hp kim .
4. Cc bc dng c bit.
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Cng ngh ch to my II
CHNG VI CH TO CHI TIT DNG BC
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6.3.3.2 Gia cng th v tinh cc mt nh hnh ngoi v trong
Nu sn lng nh, rnh then c gia cng trn my xc,
Nu sn lng ln, then trong l c gia cng trn my chut.
Rnh then mt ngoi c gia cng bng dao phay ngn trn my
phay ng hoc dao phay a trn my phay ngang.
Cch gia cng tng t nh gia cng rnh then trn chi tit trc.
Gia cng rnh then.
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Cng ngh ch to my II
CHNG VI CH TO CHI TIT DNG BC
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Gia cng cc rnh dn du
gia cng cc b mt ny ta dng phng php tin chp hnh.
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Cng ngh ch to my II
CHNG VI CH TO CHI TIT DNG BC
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6.3.3.3 Gia cng cc l ph.
Cc l ph trn bc thng l cc l du, l c ren lp cht vi
cc chi tit khc.
gia cng cc l ny, bc c nh v bng mt ngoi v mt
u hoc mt trong l v mt du.
trnh bin dng cho chi tit, lc kp nn theo hng theo chiu
trc.
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Cng ngh ch to my II
CHNG VI CH TO CHI TIT DNG BC
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5 3 4
2
3
7,5
1
S
7 6
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Cng ngh ch to my II
CHNG VI CH TO CHI TIT DNG BC
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6.3.3.4 Gia cng cc b mt sau nhit luyn.
Gia cng tinh bc thng c tin hnh i vi mt trong hoc mt
ngoi.
m bo ng tm ca cc b mt, cn ly mt ny lm chun
gia cng mt kia.
Gia cng tinh cc b mt thng thc hin trn my mi
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Cng ngh ch to my II
CHNG VI CH TO CHI TIT DNG BC
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6.3.3.5 Kim tra.a. Kim tra v ng tm gia cc b mt
a) b) c)
2
1
33
2
1
321
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Cng ngh ch to my II
CHNG VI CH TO CHI TIT DNG BC
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b. Kim tra v vun gc gia cc mt u v tm
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Cng ngh ch to my II
CHNG VI CH TO CHI TIT DNG BC
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6.1 Cu to chi tit dng Bc
6.2 Ch ct
6.3 Trnh t gia cng
TNG KT
6.3.1 Chun nh v gia cng chi tit dng hp
6.3.2 Trnh t gia cng cc b mt ch yu
6.3.3 Bin php thc hin cc nguyn cng
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Cng ngh ch to my II
CHNG VI CH TO CHI TIT DNG BC
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NHIM V V NH
1. c li chng VI v lm bi tp
2. Cc nhm chun b bi thuyt trnh nhng yu cu sau
Phn tch chc nng lm vic ca chi titPhn tch tnh cng ngh trong kt cu .Xc nh dng sn xut Chn phng php ch to phiTrnh t cng ngh gia cng chi titS nh v , kp cht, chn loi my, loi dao gia cng chi titHy nu cch tnh tng thi gia cng chi tit. thit k c g thc hin 1 nguyn cng th bn cn nhng thng s no.
3. n tp cc chng 4, 5, 6 kim tra 1 tit
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