TRNG DH CNG NGHIP TPHCM CNG TY TNHH DV-TM C KH KHOA CN C KH TUN PHT LI CM N Theo k hoch ca khoa i thc tp t ngy 17/12/2013 n ngy 3/2/2013. Em c cng ty TNHH Thng Mi Dch V Tun Pht nhn vo thc tp. Ti y em c c st mi trng lm vic thc t, c tm hiu them v cc loi my trong gia cng c kh. Tuy vi mt thi gian ngn nhng em hc hi c nhiu kinh nghim qu bu lm hnh trang cho cng vic sau ny. Em xin chn thnh cm n trng v khoa Cng Ngh C Kh cho em c c hi c thc tp bit thm v mi trng lm vic bn ngoi. V hn ht, em xin cm n thy DIP BO TR hng dn em trong sut qu trnh thc tp. c p dng nhng kin thc t cc thy c trong khoa truyn t cho em vn dng vo thc t. T em tch ly kinh nghim v hiu hn v ngnh mnh ang theo hc. Em xin gi li cm n n cng ty TNHH Thng Mi Dch V Tun Pht cho em c c hi thc tp ti cng ty. Cm n ng Kin gim c cng ty cng cc anh k thut vin tn tnh hng dn, gip , chia s nhng kinh nghim qu bu cho chng em trong sut thi gian thc tp ti cng ty, to iu kin cho em hc hi, tip cn vi nhng loi my trong cng ty, cho chng em tip xc vi mi trng lm vic thc t hon thnh tt k thc tp ny. Do trnh cn hn ch nn trong qu trnh thc hin bo co khng th trnh khi nhng thiu st, rt mong thy c thng cm.

Tp. H Ch Minh, ngy 5 thng 2 nm 2013 Sinh vin thc hin

on Vn Thun

PHIU NHN XT CA CNG TY

NHN XT NH GI CA KHOA C KH

Tp.HCM, Ngy.thng.nm 2013

MC LCLI CM N1PHIU NHN XT CA CNG TY2NHN XT NH GI CA KHOA C KH3LI M U5CHNG 16TNG QUAN V CNG TY THC TP V MT S QUY NH CHUNG CA CNG TY61.1.Lch s hnh thnh v pht trin Cng ty TNHH TM DV CKhTun Pht.61.1.1 Lch s hnh thnh ca cng ty:61.1.2 S pht trin ca cng ty:71.2 . c im hot ng sn xut, kinh doanh v s t chc ti cng ty.81.2.1 c im hot ng sn xut kinh doanh.81.2.2 S T Chc.8CHNG 212NI DUNG THC TP122.1. MC CH V YU CU12-Kho st tm hiu dy truyn sn xut ca nh my, quy m v b tr phn xng, chng loi cc my cng c, cc sn phm ch to, cc tiu chun p dng trong sn xut.12-Tm hiu cc nguyn l hot ng , cch vn hnh ca cc my gia cng, ch to chi tit ca nh my.12-Tm hiu quy trnh cng ngh gia cng mt s chi tit in hnh.12-Thc tp ti xng nng cao tay ngh, tham gia ch to mt s chi tit ti nh my.122.2. CC PHNG PHP GIA CNG V AN TON LAO NG122.2.1. C122.2.2. K THUT HN172.2.3. TIN232.2.4. PHAY332.2.5. K THUT KHOAN372.3 GII THIU V SN PHM CA CNG TY382.3.1 Gii thiu v h thng phanh:382.3.2 Cc h thng phanh thng dng:40CHNG 346QUY TRNH CNG NGH CA CC CHI TIT463.1. Quy trnh cng ngh ca puly:463.1.1 Chun b:463.1.2 Yu cu k thut:473.1.3 Cng thc l thuyt:473.1.4 Cc bc thc hin:473.2. Quy trnh cng ngh ca np puly:543.2.1 Chun b:543.2.2. Yu cu k thut:543.2.3 Cng thc l thuyt:553.2.4. Cc bc thc hin:553.3. Quy trnh cng ngh ca cht nh v m phanh:603.3.1 Chun b:603.3.2 Yu cu k thut:613.3.3 Cng thc l thuyt:613.3.4 Cc bc thc hin:613.4. Quy trnh cng ngh ca cht nh v np buly:653.4.1 Chun b:653.4.2 Yu cu k thut:653.4.3 Cng thc l thuyt:663.4.4 Cc bc thc hin:66CHNG 470NHNG CNG VIC LM V KINH NGHIM THU C TRONG QU TRNH THC TP TI CNG TY.704.1 NHNG CNG VIC LM.704.2 KINH NGHIM THU C.70

LI M UTrong thi i cng nghip ho, hin i ho, ngnh cng nghip nng l mt trong nhng ngnh mi nhn pht trin t nc. Cng ngh ch to my phi tin phong i u thc y cc ngnh cng nghip khc pht trin. Mun nh vy phi c i ng k s v cng nhn k thut lnh ngh. Trong nhng nm gn y c kh c nhng bc nhy vt ng k, c nhiu cng ty c kh ch to a sn phm ca mnh vn ra khp th gii.Ngnh c kh ch to my l mt trong nhng ngnh o to ch lc ca nhiu trng i hc, cao ng v trung hc chuyn nghip trong c nc. Chng em l nhng ngi tip bc cng vi nhng anh ch i trc tip tc xy dng nn k thut nuc nh snh ngang cng cc nc trong khu vc v th gii. Ngay t nhng ngy bc vo ging ng chng em thc c trch nhim ca bn thn l phi phn u hc tp tht tt. Thi gian nay la c hi mi chung em th hin kha nng cua ngun lc tng lai co kha nng n u va t o co hng i cho ban thn.

Tp. H Ch Minh, ngy 5 thng 2 nm 2013 Sinh vin thc hin

on Vn Thun

CHNG 1TNG QUAN V CNG TY THC TP V MT S QUY NH CHUNG CA CNG TY1.1.Lch s hnh thnh v pht trin Cng ty TNHH TM DV CKhTun Pht.1.1.1 Lch s hnh thnh ca cng ty:Tn cng ty: CNG TY TNHH TM-DV C KH TUN PHTTr s chnh: D An- Bnh Dnga ch : 25/4B QL1K, KP. Tn An, P.Tn ng Hip, TX.D An,T. Bnh Dngin thoi: (0650) 3 841 080 Fax: (0650) 3 841 081Ngn hng giao dch 1: STK: 55272569 ti ngn hng ACB.CN Vn Lang, G Vp, TP HCM.Ngn hng giao dch 2: STK: 67010000381152 ti ngn hng BIDV. CN ng NaiM s thu:3700876260Vn iu l:9.800.000.000 VNGim c iu hnh :ng Nguyn Trung Kin Lnh vc, ngnh ngh kinh doanh: - Mua bn thit b ph tng cc loi my khai thc .- Lp t, sa cha, bo dng cc loi my khai thc , ch bin . - Dch v cho thu xe cn cu.-Gia cng c kh: tin, phay, hn, c, ..- Sn xut h thng phanh trong cc my cng c. Loi hnh doanh nghip : Cng ty TNHH hai thnh vin tr lnCng tyc thnh lp vo ngy 01 thng 02 nm 2008. Cng ty hotng theo giy php kinh doanh s 4602003305. Vn iu l ca cng ty ti thi im thnh lp ln u c xc nh l: 2.400.000.000 ng. Ccu phn theo shu cthnhsau:- Nguyn Trung Kin: 1.320.000.000 chim 55% vn iu l- Nguyn Tun Phng: 1.080.000.000 chim 45% vn iu l 1.1.2 S pht trin ca cng ty:n ngy 24 thng 08 nm 2009 thay i li giy php kinh doanh ln th 02. Giy php kinh doanh s 3700876260.Ngy 24/08/2009 ,vn iu l c xc nh l 9.800.000.000 ng cho n thi im thng 09 /2012 l khng thay i. Cng ty cvniu l: 9.8 t. Gm 3 thnh vin gp vn : Nguyn trung Kin gp vn 61.22%. Lu Hong Long gp vn 19.38%. Nguyn Tun Phng gp vn 19.38%.Ccu phn theo shu cthnhsau:Nguyn Trung Kin: 6.000.000.000 chim 61,22% vn iu l.Nguyn Hong Long: 1.900.000.000 chim 19,38% vn iu l.Nguyn Tun Phng:1.900.000.000 chim 19,38% vn iul Quy m v nng lc v lao ngCng ty c tng s cn b cng nhn vin l 59 ngi, trong :- Trnh i hc: 5 ngi - Trnh cao ng: 08 ngi - Trnh trung cp: 10 ngiCn li l cng nhn k thut v cng nhn.1.2 . c im hot ng sn xut, kinh doanh v s t chc ti cng ty.1.2.1 c im hot ng sn xut kinh doanh. Cng ty cquyn tchc mua bn, lpt, gia cng thit b, ph tng cc loi my khai thc . Sa cha, bo dng cc loi my khai thc ch bin . Lp t cc my nghin sng , my sng ct, dch v xe cn cu, gia cng c kh.Tchc thu mua cc mt hng trc tip ca ccn vthng qua cc tthng m bo tt ccc thit bn vcung cpu c cht lng cao,gi c hp l ph hp vi gi c th trng v c bo hnh theo ng tiu chun ca nh sn xut.n v m bo c hiu qu t ngun vn kinh doanh ,m bo hon thnh ngha v np thu Nh Nc, thc hin v chp hnh y cc quy nh Nh Nc v qun l ti sn, tin vn, vt t, hng ha theo ng quy nh ca Nh Nc trn c s kinh doanh y hng hp l. Nhng sn phm chnh ca n v:Mua bn thit b ph tng cc loi my khai thc .H thng thng trong my cng c.Lp t cc loi my nghin , sng , my sng ctNhng nguyn liu u vo bao gm: st thp, cone, u nghin ( nhp khu), mt, dy in, nhng, xch ti, bng ti, 1.2.2 S T Chc.

P.T CHC HNH CHNHPHNG K TONPH GIM CPHNG KINH DOANHGIM CPHNG K THUT

Chc nng nhim v ca cc b phn * Ban gim c: Gm Gim c v ph Gim c.* Gim c:l ngi chu trch nhim iu hnh, qun l v chu trch nhim trc tip mi hot ng kinh doanh hng ngy ca cng ty theo mc tiu ra .Ch o phng ban, b phn thc hin ng chc nng, nhim v v quyn hn c giao.V l ngi chu trch nhim trc php lut Nh Nc.* Ph gim c:l ngi h tr cho Gim c trong vic iu hnh v gim st hot ng ti cng ty, c Gim c y quyn mt s vn thuc quyn hn ca Gim c.Tham mu cho Gim c trong nhng vn quyn hn trong cng ty.B phn mua hng v cung ng dch v:L b phn mua v nhn hng t bn ngi bn .L b phn x l hng ha tha hoc thiu .L b phn cung cp cc dch v cho thu nhm to mi iu kin tt nht cho khch hng.* B phn k thut:- T chc v qun l thc hin cng tc k thut- Lp k hoch thc hin nhanh chng.- Gim st n c thi cng, an ton lao ng cc cng trnh. - Tng cng cng tc nghin cu chuyn su v khoa hc k thut nhm t n trnh cao nht, xy dng cc quy ch ca cng ty.- Bi dng hng dn o to cn b k thut.* B phn k ton :- T chc qun l vic s dng vn v cc qu ca cng ty phc v cho nhu cu kinh doanh theo nguyn tc bo tn v sinh li.- T ch hch ton k ton, kim ton theo quy nh ca nh nc.- Thu hi tin n ca cc n v v c nhn, thanh ton chi tr cc ch cho cn b cng nhn vin khi c Gim c ph duyt. Tnh lng cho cn b cng nhn vin theo bng chm cng v hp ng khon gn pht lng cho cn b cng nhn vin ng nh k theo quy nh.- Chu trch nhim trc php lut Nh Nc v tnh st thc cc s liu bo co ca cng ty.- Ch tr vic kim k, nh gi ti sn hng nm theo quy nh.- Thc hin ngha v np thu v cc khon np ngn sch Nh Nc theo quy nh ca php lut.- Thc hin y cng tc kim k, kim ton, bo co nh k theo quy nh.* B phn qun l hnh chnh :- C chc nng t chc v qun l nhn s trong ni b cng ty c nhim v tuyn dng nhn s p ng nhu cu pht trin ca cng ty, theo di ch tin lng, khen thng k lut .- C nhim v gii quyt cng vn n v cng vn i hoc th t giao dch .- Qun l c s vt cht k thut phc v nhu cu i sng.Mt s hnh nh v my mc thit b m cng ty lp t, mua bn:

CHNG 2NI DUNG THC TP2.1. MC CH V YU CU-Kho st tm hiu dy truyn sn xut ca nh my, quy m v b tr phn xng, chng loi cc my cng c, cc sn phm ch to, cc tiu chun p dng trong sn xut.-Tm hiu cc nguyn l hot ng , cch vn hnh ca cc my gia cng, ch to chi tit ca nh my.-Tm hiu quy trnh cng ngh gia cng mt s chi tit in hnh.-Thc tp ti xng nng cao tay ngh, tham gia ch to mt s chi tit ti nh my.2.2. CC PHNG PHP GIA CNG V AN TON LAO NG2.2.1. Cc l mt phng php ch to sn phm bng cch rt kim loi lng vo khun c c hnh dng v kch thc nht nh. Sau khi kim loi ng c li, ta thu c sn phm c kch thc v hnh dng ph hp vi yu cu ra. Sn phm c ra c th dng ngay c th gi l chi tit c. Phn ln vt c cn phi qua gia cng ct gt nhm tng chnh xc v bng b mt.Sn phm c l phng php ch to sn phm kim loi rt ph bin. C th tin hnh c trong khun ct, c trong khun kim loi, c di p lc, hin nay c mt s phng php c c bit cho cht lng cao, c bit v chnh xc v bng b mt nh c dng mu chy v.v. ..K thut c ngy cng c ci tin nhm tng nng sut v nng cao cht lng sn phm.2.2.1.1. c im v cng dng ca c - c im: + c c th gia cng nhiu loi vt liu khc nhau: Thp, gang, hp kim mu v.v... c khi lng t mt vi gam n hng trm tn. + Ch to c nhng vt c c hnh dng, kt cu phc tp nh thn my cng c, v ng c v.v... m cc phng php kh hkn khng ch to c. + chnh xc v hnh dng, kch thc v bng khng cao (c th t cao nu c c bit nh c p lc) + C th c c nhiu lp kim loi khc nhau trong cng mt vt c. + Gi thnh ch to vt c r v vn u t t, tnh cht sn xut linh hot, nng sut tng i cao. + C kh nng c kh ha v t ng ha. + Tn kim loi cho h thng rt, u ngt. u hi. + D gy ra nhng khuyt tt nh: thit ht, r kh, chy ct v.v.. + Kim tra khuyt tt bn trong vt c kh khn, i hi thit b hin i.-Cng dng: + Sn xut c c pht trin rt mnh v c s dng rt rng ri trong cc ngnh cng nghip. Khi lng vt c trung bnh chim khang 4080 % tng khi lng ca my mc.Trong ngnh c kh khi lng vt c chim n 90% m gi thnh ch chim 20 25 %.Sau y l mt s cng ngh c cng ty s dng, c bit l c mu chy:2.2.1.2. c trong khun ctKhun ct vn gi mt vai tr quan trng trong ngnh c, c trong khun ct l mt phng php to hnh lu i, nhng cho ti nay vn cn chim mt v tr quan trng trong k ngh c : 90% sn lng vt c ca th gii sn xut bng khun ct, phn cn li do khun kim loi v cc dng c c bit khc .Khun ct c dng nhiu v d ch to, r, vn u t t. Hn na khun ct li rt vn nng, c th dng c vt nh t 10 gam cho ti vt ln c khi lng hng trm tn, c th dng c bt k hp kim no nh : thp , gan cu , gang sm , gang sm , ng thao , ng thanh , hp kim niken , hp kim nhm , mag .v .v .v .*Quy trnh sn xut c trong khun ct c th c tm tt nh sau :

- B phn k thut cn c theo bn v chi tit, lp ra bn v vt c, trong c mt phn khun, li, dc c, lng d gia cng c kh, dung sai, co nht ca kim loi khi ng c - B mu l mt s cc mu khc nhau nh : tm mu, mu h thng rt, u ngt. Trong mu c v li l hai b phn ch yu. Mu c dng ch to lng khun c trong hn hp lm khun, hp li dng lm li nu c. Mu, hp li thng do xng mc sn xut .- Khun, mu, hp li thng lm thnh hai na lp li vi nhau bng cc cht nh v.- Khun c v li thng phi sy kh tng c tnh v kh nng thng kh .- B phn nu chy kim loi phi phi hp nhp nhng vi qu trnh lm khun . Lp rp khun tin hnh rt kim loi lng vo cho kp lc .- Sau khi kim loi ng c, vt c c hnh thnh trong khun, tin hnh ph li, kim tra vt c bng th cng hoc bng my .- Kim tra li khu cui cng, gm kim tra hnh dng v kch thc, cht lng bn trong vt c.Ngi ta c quan nim rng c bng khun ct c nng sut khng cao, sn phm c km chnh xc, mun c chnh xc cao hn phi qua gia cng c kh li . iu ng i vi khun ct, t xt, do thng thng c lm bng tay. Trong nhng nm gn y nh s dng cc hn hp ct c thnh phn v tnh cht mi, nh y mnh c kh ha, t ng ha trong sn xut c nn nng sut c c tng ln r rt, cht lng c cng c ci thin rt nhiu, chnh xc cao hn. c trong khun ct c lm trn my nht l nhng my p p lc cao chim u th rt nhiu, c th cnh tranh vi mt s phng php c c bit v chnh xc v nhn b mt ca sn phm c. C th ni rng cho n ngy nay khun ct vn chim gi mt giai tr quan trng trong ngnh sn xut c .

T l cc cng ngh khun trong sn xut c1/ Khun ct ti ; 2/ Khun ct kh ; 3/ Khun ct t rn ; 4/ Khun kim loi ; 5/ Khun c c bit khc.2.2.1.3. c bng khun dng mu chy (mu ho hi)Cch c ny do H.F. Shroyer pht minh ra nm 1958 v c dng vo cng nghip t 1962. Mu lm bng nha polystirn xp (nha trng nh, ta thng thy dng lm cc tm m lt my khi ng hm) d chy. t mu trong hm, ct vo (c th dng ct khng cht dnh), rung, y cht. Rt kim loi ti u mu chy bin i ti , hi sinh ra qua khe ct thot ra ngoi. Vt c ng ri, ct ra dng li c.u im ca phng php l mu nh, r, d ct gt, khng cn ly ra khi khun, ch dng mt ln do tn cng ch to mu : vi mu ln c th ct bng dy in tr nung ri dn, vi mu nh sn xut hng lot trn my p nhit 200 350 C.Mu c th em lm khun dng hn hp ct t kh, ct chy lng hoc khun t. Trong khun ct st thng thng ngi ta ch hay dng polystirn lm mu u ngt kn hnh cu c th t trong khun khng cn ly ra.Gn y ngi ta dng polyurthan xp thay cho polystirn c th ch to d dng trong khun g, thch cao hoc kim loi .Thc t c trong khun mu chy cha c coi l phng php c chnh xc v mu to kh lm mt vt c cha tht p. Song phng php c ny vn pht trin, c nhiu nc dng, c nhng vt ln ti 20 tn .2.2.1.4. Quy trnh c mu chy trong khun v mngQuy trnh sn xut c chi tit insert c thc hin theo th t qua cc nguyn cng nh sau :- Nguyn cng th 1 : To mu sp .- Nguyn cng th 2 : X l v lm sch mu sp .- Nguyn cng th 3 : Rp nhnh cy .- Nguyn cng th 4 :To lp v mng (nhng qua dung dch v ph ct) - Nguyn cng th 5 : Ly sp ra to lng khun .- Nguyn cng th 6 : Nu rt kim loi .- Nguyn cng th 7 : X l v hon thin sn phm .Tm tt trnh t c trong khun v mng nh sau:-Ghp mu vo tm mu: dng mu bng kim loi kp cht trn tm thp hoc gang xm. Lm sch mu v tm mu ri phung ln trn mt lp Silicol.-Ghp cc mu thnh nhnh cy-To khun cho mu bng cc hn hp ct chu nhit-Ly mu bng cch em sy nhit 1600 C khong 5 pht, p sut 7 at.- Cui cng em rt kim loi vo khun thu nhn vt c.2.2.2. K THUT HN2.2.2.1. Thc cht v c ima. Thc chtHn l phng php ghp ni 2 hay nhiu chi tit bng kim loi li vi nhau m khng th tho ri, bng cch nung kim loi n trng thi chy hoc do sau nh s ngui v ng c to nn mi hn lin kt kim loi hoc dung p lc ln.b. c im-Tit kim c kim loi so vi tn rive t 10-20%,so vi phng php c t 30-50%.-C th to c cc kt cu nh c kh nng chu lc cao.-C th hn 2 hay nhiu kim loi c tnh cht khc nhau.- bn v st kn ca mi hn ln.-Trong vt hn cn tn ti ng sut d ln, kh nng chu ti trng ng thp (tuy nhin kt cu mi hn kh tt khi chu ti trng tnh).2.2.2.2. Cc phng php hn: phn theo hai nhm c bn-Hn nng chy: kim loi mp hn c nung n trng thi nng chy kt hp vi kim loi b sung t ngoi vo in y khe h gia hai chi tit hn, sau ngui v ng c to nn mi hn. nhm hn ny gm: hn h quang, hn kh, hn in x, hn plasma, hn bng tia laze, hn bng tia in t.-Hn p lc: khi hn bng p lc kim loi vng mp hn c nung n trng thi do, sau dng mt p lc to mi lin kt kim loi. Nhm hn ny gm: hn in tip xc, hn masat, hn n, hn siu m, hn cao tn, hn khuch tn2.2.2.3. Hn h quanga. Thc cht: l phng php hn nng chy s dng nhit ca ngn la h quang sinh ra gia cc in cc hn, v thc cht h quang hn l dong chuyn di ca cc in t v ion trong mi trng kh gia hai in cc hn, n km theo s pht nhit ln v pht sng mnh.b. Phn loi-Theo dng in+Dng in hn xoay chiu : cht lng mi hn khng tt v cng dng in khng n nh.+ Dng in hn mt chiu: cht lng mi hn tt hn, d gy h quang, d hn, cng dng in n nh, xong t c s dng v gi thnh t.-Theo in cc hn+in cc hn khng nng chy: c ch to t vt liu c nhit nng chy cao nh graphit, vonfram ng knh que hn d= 1 : 5 mm i vi que hn vonfram v d = 6 : 12 mm i vi que hn grafit, chiu di que hn thng l 250 mm, u vt cn.

+in cc hn nng chy(que hn): c ch to t kim loi hoc hp kim c cng thnh phn vi tahnh phn kim loi vt hn. Cu to:

Lp thuc bc que hn c ch to t hn hp dng bt gm nhiu loi vt liu kim loi trn u vi cht kt dnh bc ngoi li c chiu dy t 1-2 mm.Tc dng ca lp thuc bc que hn:- Tng kh nng ion ha d gy h quang v duy tr h quang n nh, thng thng a vo thuc bc hp cht kim loi kim. Bo v mi hn trnh s oxi ha hoc ha tan khi vo mi trng. To phu hng kim loi vo vng hn, to x lng v u che ph mi hn lm gim tc ngui mi hn trnh nt.- Kh oxi trong qu trnh hn ngi ta a vo thnh phn thuc bc cc phero hp kim hoc kim loi sch c i lc mnh vi oxi, c kh nng to oxit d tch khi kim loi lng.2.2.2.4. Cc loi my hna. Cc loi my bin p hn xoay chiu:-My hn xoay chiu iu chnh cng dng in bng li t di ng.

Nguyn l: Theo s nguyn l trn y l loi my hn iu chnh cng dng in bng li t di ng. My hn kiu ny c mt li t di ng A nm trong gong t B ca my bin p. Khi li t A nm hon ton trong gng t B th t thng do cun th cp sinh ra c mt phn r nhnh qua li t lm cho t thng qua cun th cp gim in p trn cun th cp gim. Khi li t dch ra ngoi theo phng vung gc vi mt phng ca gng t B, khe h gia li t v gng t tng ln, t thng r nhnh gim lm cho t thng qua cun th cp tng ln in p trn cun th cp tng.My hn c li t di ng c kt cu gn, iu chnh dng din hn v cp, khong iu chnh rng do hin nay c s dng nhiu: -My hn xoay chiu iu chnh cng dng in hn bng thay i s vng dy cun th cp:

Phn bit cun s cp- th cp: + ngun vo + tit din dyNguyn l: dng kha K thay i s vng dy I tng bng cch gim s vng dy cun th cp,I gim bng cch tng s vng dy cun th cp.b. Cc loi my hn mt chiu:-My hn chnh lu ba phaS nguyn l:

My hn dung dng in chnh lu c h quang chy n nh hn my hn xoay chiu, phm vi iu chnh dng in hn rng h s cng sut hu ch cao,cng sut khng ti nh,kt cu n gin hn.-My hn bn t ng hn trong mi trng kh ba v CO2.

Cu to:+ My bin p hn chnh lu: SVI 300i+ C cu cp li dy hn t ng Mig2FBnh cha kh CO2: trn bnh cha c lp lu lng k iu chnh lu lng kh t trong bnh cha ra v lm n nh p sut kh trong qu trnh lm vic.+ M hn: c lp vi c cu cp li dy hn t ng. Nhim v m hn dung dn dy hn v kh trong qu trnh hn.u im: hn mi hn y lien tc khng b ngt qung, cht lng mi hn tt v cng dng in n nh, b mt mi hn sch.2.2.2.5. Hn v ct kim loi bng kh O2 v C2H2a. Thc cht v c im:Hn v ct bng kh l phng php hn nng chy s dng nhit ca ngn la sinh ra khi t kh chy chy trong dng kh oxi k thut, thng thng nht l hn v ct bng kh O2 v C2H2.Hn v ct bng kh c c im : hn c cc vt hn mng, hn c hai hay nhiu kim loi c tnh cht khc nhau v d nh hn gang, ng, nhm.Nhc im: - Nng sut hn thp - Cht lng mi hn khng tt, do b nh hng nhit vt hn b co rt, cong vnh nhiu hn so vi hn h quang.

b. Thit b hn v ct kim loi bng kh O2 v C2H2 ( trm hn v ct kim loi bng kh O2 v C2H2)-Bnh cha kh O2: ch to bng thp tm, chiu dy: 7mm , bng phng php dp hoc hn c Dngoi=219mm, chiu cao H= 1390mm, c dung tch cha 40 lt, Plm vic=150 at. nhn bit bnh cha kh oxi sn mu xanh hoc xanh da tri-Bnh cha kh C2H2: c ch to bng thp tm, chiu dy 7mm, bng phng php dp hoc hn, c Dngoi=400mm, H=800mm, Plm vic