CNG NGH CH TO MY II

TRNG I HC KINH T K THUT CNG NGHIP

KHOA C KH

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

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.

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)

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.

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.

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.

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.

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.

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

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.

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.

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

Cng ngh ch to my II

CHNG VI CH TO CHI TIT DNG BC

14

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

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.

Cng ngh ch to my II

CHNG VI CH TO CHI TIT DNG BC

16

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

Cng ngh ch to my II

CHNG VI CH TO CHI TIT DNG BC

17

2. Gia cng tt c cc mt chnh sau hai ln g t.

Cng ngh ch to my II

CHNG VI CH TO CHI TIT DNG BC

18

3. Gia cng tt c cc mt chnh sau ba ln g t.

Cng ngh ch to my II

CHNG VI CH TO CHI TIT DNG BC

19

4. Gia cng tt c cc mt chnh sau bn ln g t

Cng ngh ch to my II

CHNG VI CH TO CHI TIT DNG BC

20

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.

Cng ngh ch to my II

CHNG VI CH TO CHI TIT DNG BC

21

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

Cng ngh ch to my II

CHNG VI CH TO CHI TIT DNG BC

22

40

4

560

2

2

58

2

5

3) 4) 5)

Cng ngh ch to my II

CHNG VI CH TO CHI TIT DNG BC

23

Cng ngh ch to my II

CHNG VI CH TO CHI TIT DNG BC

24

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

Cng ngh ch to my II

CHNG VI CH TO CHI TIT DNG BC

25

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

Cng ngh ch to my II

CHNG VI CH TO CHI TIT DNG BC

26

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.

Cng ngh ch to my II

CHNG VI CH TO CHI TIT DNG BC

27

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.

Cng ngh ch to my II

CHNG VI CH TO CHI TIT DNG BC

28

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

Cng ngh ch to my II

CHNG VI CH TO CHI TIT DNG BC

29

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

Cng ngh ch to my II

CHNG VI CH TO CHI TIT DNG BC

30

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.

Cng ngh ch to my II

CHNG VI CH TO CHI TIT DNG BC

31

Hoc Kp cht bng kh nn

Trc g kh nnng kp kh nn

Cng ngh ch to my II

CHNG VI CH TO CHI TIT DNG BC

32

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.

Cng ngh ch to my II

CHNG VI CH TO CHI TIT DNG BC

33

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.

Cng ngh ch to my II

CHNG VI CH TO CHI TIT DNG BC

34

Gia cng cc rnh dn du

gia cng cc b mt ny ta dng phng php tin chp hnh.

Cng ngh ch to my II

CHNG VI CH TO CHI TIT DNG BC

35

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.

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

Cng ngh ch to my II

CHNG VI CH TO CHI TIT DNG BC

37

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

Cng ngh ch to my II

CHNG VI CH TO CHI TIT DNG BC

38

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

Cng ngh ch to my II

CHNG VI CH TO CHI TIT DNG BC

39

b. Kim tra v vun gc gia cc mt u v tm

Cng ngh ch to my II

CHNG VI CH TO CHI TIT DNG BC

40

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

Cng ngh ch to my II

CHNG VI CH TO CHI TIT DNG BC

41

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