Giáo trình ma sát học - Chương 5 docx

57 CHUaNG 5 , ~ v , MON CUA CAPMA SAT • f· ,- " A ' , VI cm TIET MAY, .1. Khai nitm va,pl\a •• l~i cae .dtng mai moo va hu hOng t,-ong chi tiit may•. )<hal o~mco bcint~:m6n,~a~p ma aat va chi tiM.may gOm: ~ _ . ·-·~;W~ ~t Ia·;~p hQPhal ~m~t I~p ghep 00 chuy6nd¢~tltang d6i cUa cae chi OOLtrQngd~u k~n slr-dyng_,~ythlr ngh~m~Ngoai v~t I~u hinh dang cae ~ m~t tl&p xlie, slrGhu~n d~g tU'sngdOl,alp ma sat c6n d~c,tr~.g ,bQimO.trltdng xung quanh trong do cO d~ng va chAt b61tran. , - K&t cciuma sat la k&t cciu may cO chli'a cae ~p ma sat. , - CllOngd~ mai mon Ia ty.~ giil'a d(l mi>ochi ~t (~y mAu thL\').vOiQuangrduanQma sat hay kh6i IU'QJlg c6ng v~e ~,hoa.n thanh. - TOed¢ mon Ia ty 50 glcta (t¢ mon chi ~t va thdi gian xay ra sl! mal mono - ~ mon glOih~n cua chUi6t (ktit cciu) Iad¢ mon ma n~u sU,dyngtkip sa hU'hong, khOngkinhtEi, ~ khOng ct;lo, phep vi gjc)m~ tin c4Y cUaCd diu. Sl! mon phy:ttmOc.,~q·~~ng ~ghQc ehuyeSnd~ng (tan hay trU'dO.aDsuAt va v: b6i tran va vftt I~u. 59 58 j \Ph~ thul}c ~o : D~ng dl},ng hO,'C chuy~n d~ng (Ian haytrtJ¢), ap su~t va v, bO,itrdnva v~t I~u. Mal mon la slf thay dOlm~t cach tertU k{ch thtJOcchi tkit xay ra khl cO ma sat, va ehia 3 1o~1:mal mon theo dtJong,th~,t{oh,trQng krqng." !' ,~~~C_' HLthong'fa qua trio~.·fhay.40Vo. ~t, khOngd~u v~ ,,' , ~ "-•• • :' - i 'll ;>. '.~ r t~ng thai hinh flQC;cU3 cae b6 m~t tna sat cung nhLt~u true va tfnh ch~hcae lap ~ m~t. .2~;af'CftimOncua cae ~m,t 10m 1c,.1. , Trong qua trinh mal moo, cae t>t\ m~nap 'ghep'$e trt1C1ltLtongdOl va nhau dan c1~n Slf ~tva be gay nhung cheSnhcip nh6, ~o thanh nhung nhcip nhOmOi. Qua trinhdo 0lt·tJ&pdt!n va sl.!ram nhan cae ~ tn~t ma sat. Nhltng':thantttlfU cUa nh~u khoa hQe tiOOnganh eho phepta phAnUGhqua trinh mal mon thanh 3 h~n tLt<;1l1g: - 51.! ttJdIlg tae cU2I cae ~ melt ma sat - 5lf thay t16ixay ra1torlQ ~b3,'m~t1ttm ~I - 5lf pha huy cac M m~t ciy Sa h~n ttJQJlgtr6n khOngngCtngxcio tr~n va anh hU'c,.,grlWntlau. TLtdttgtae cae ~ m~t cO th~ ra CdhQe h~e phAn tlr. TtJdflgtaecdhQc b~u h~n bang Slf ,earn nh~p va mae nOIcae phan tlr nhap nhO;Tltdng tacph~h tlr b~u h~nt>ang slf bam d{nh va xtImthlfc. Chli y rang d~ don va d~ :deo eua v~t ran phlJ thu~e~ngthal eh!u Ilfc vatronglOp' ho~t d~ng cO th~ xayra mQibitin rl61hOa Iy gan rr6nvOl qliatrinh ma sat. + Slfthay dOixay ra trong IClp~ m~t kim loqi: sq thay d~i troFig lcip.~ m~t me sat IiJdo slf bltin d~ng', sl:! 60 59 1ing I6n"tUa nh~ d~ vatae d~g hria hqe eaa m6i tntCmg xung quanh. • Thay dOido b~n d~ng xay ra nhll sau: NhO'ngb~n d~ng dan he; nhiOu IAn'do-at! khang hoanth~n ct.ia cciu true trong nhO'ngd~u ~n xae dtnh cO th~ dAn d~n slf We mot cae ~ m~t rem, o:)n Sl.!ibt6n d~ng . dah h6f'nhtAu 'tAtIt nhO'ngnhAp nh6 vi m6 cUs'~ m~t tnrc;Jt tamrdt~cotu trUe. B~ d~ng-deo thay,dOt cAu true elIa' ~t I~u lop ~ m~t WltiJ slf t&g h<;lpeua bcSnquatrinh quan trQng nhAt: Slf tnl¢ theocat'm~tpllcing tin'h th~, Slf sOngflnh th~, Slf ~ch cae nguy~n ta ra f(hUJVl'1riban cmuitrOrlg m~ng ciJng va chuy~n d¢ng nh~t ct.iachung, va slf pha huy cciutruc. Bi6n d~ng deo " nhi~t d¢ thap han nh~t d¢ tai k~t tinh dAn dAn b~n Cling va lam Mnldp~ mi[lt. Nhltng d¢ Cling vi m6 ngay tr~n ~" m~t cciu"tru~.giarn xuOng,d~t Clfed~i 6 d¢ sc!lunao do rOig~.rn d~n gici tr; ban dall. ," ,",- ' " ,qogQ ~g cU~,(~pthianhphan~utrue khae nhau' YiJ' tj,p d~ngnh~u 'lcinct.ia tat trqng,I~c dauxciyra '. ;: "'~' ',': '. " , " sl/ m~Jmqn -fJ1~nhfl~n m6"1. AP,. suAt irAn caq th~nh .pha'nClin~'Ulng;ep-chungvaQ n6n,m~m Dll~i,tac ,dlJl'\Q ct.iallfC ma ~t m¢t 50 b! pt)ei va,va divh.~uy~n~ Do do , :,,'; k:''.;._ oj " .,- ;'.,: • ~.~.r·.' ,r l:'~,,' ," . ~ .cOs,!iarn gjitu cae thanh, ph6ncllu,tnie Cling·tr6n .~ mi[lt. • Th~ydOido nh~td~ta.ng: " N~u nhlttd¢cij_c Idp M~t cao h~ nh~ d¢ tal kAttinh kifJ.1~~ 1dP,t?6mijt sa· kh6ngb~ ,pY'Ogma hQa m6m (xayra 'do slf Ia'mphcingnheln~ mc}t,slf chay eua toan 61 1 b6. kim~j hay chi m¢t thahh phAn cUa;hc;Jp kim). NhL' d¢ cao va b~n dqng deo tqo thucln lc;Jicho-cae qua tri khu!ch;tan : Khi cOsll tang nh~td¢Cl:Ic b¢ va'lam~nh nha ,b6-tlllilt bang kh6ikim ~i 'lAy quanh,cO thA'Vlo:ra a1\1.trUc flhu khhtoi. , ;. ',i SI.[,bi6n ~ng;1:ieo, sll tiing nh~t va bkin dtit tn.ie cOth~ xay ra dOng thai hay ri&ng b~t va.gAy ra' . ~AtJlOng ~t l~u.Ung suAt nay cOth~ Jam ra dlIu trU 'Khtngh~n cti'u vi mO sll ~p xuc cae chi ti!i tro. d~uk~n tat trqng va nh~ d¢ caoda Me t1tnh kha na tqora,c;cicmacmaplattna. ~ , " . i·i.·, 4 ,"-"- :·U· ~./ - - 4< t ~ ~ ' •. __ : - - ••• oJ ~ .~• ! .~- ,,,' t, ••. 111 __ .' __ •••••••• f' ,. • ' 1. cAlItrue ban dAu 2. 'cau trUe nPngc~y L '. 3. Plalrml '4. ti~ t.tphBtra • Thay d6ido ~e d~ng hoa hQe Clia mOi trLtdng: MOitrLtctl,g khOng khl tqo tr~n ~ m~t'kim Ioqi dltQC Ja sqGh~hg q~a'ttihh mafttlohalc"mang 0 xyt. Mang' 'xYt'bab~ ~ ri1~.tkh6i b!'kAm 'thlj'e v~ la yEiu t6 qlJ trQr1g khOng nhOllij trong ma sat khOng bOi,trdhh~c fran 9idi~h~n rrla ba::trdng ma' sat naa~aYdt.Ma·~ga X gop ptlfJn lam giamCltdng'd~ 'ffi6nM m~tm~;Sat nh~u. ' Khi tae d¢ng vdi cac'chAt ho~t 'c1¢hgpha tro d/JU,"cac M rn~t kiln Ioqi(fif~'~hO' nh~gmahg h~ chat hda hQc <i):\lai tr6 tltong t~,~atlg 0 xy{cacm~. 62 61 fl,ay ,qaQ::v4 ~ 'h.~",q~ ,};l6,~t khqtJ,llPo, n6u, t6c d¢ ~o thanh ,Ch~QQjdn '1uIl,·~d¢. mai mon. r' :If:~ ~g .~xyt ~hixay fa 51.[, phAn i;lUy Ph.6tbOi tran " nh~t d~ cao cO kha nang Mn h6a:.b' m~t bang c::acbon. '. "-"'i ;GOncacch~~~rw va, kpi.h~t d~9. $i~J;lmtang d~ mai mon.<, 'tJ .e" . '; I' + .&1 phci ~y·-\ca,eWm4t ma sat:gOm cae(j~ng C<' bc\{l $ijlU " . • SL!~~ ",t!Tl~:q9 nhUng phcin"U):cling cYa h~t mal th~f~P d6n mQtd~ sclu nh:lt d!o~ ~y ra. • T~o v!t Xltac: khi trlt~ phan t<r ~mnMp,'bi,ep sa idt;y ~1)itvv4Phfa irLldc sangh~i,btn :va $p~u6flQ ph~.<Jltcili~·thanll" v~tXU'dc. V6t Xltdc mat di khi phill;l, 1a, x6m· nfl4p ,vao thoa~.ra'khOi,!~u"g ti6p xue ttwpJ~ Ib!~pVa. ~cbl d.~ I1iJ ·ld;K»gidi ~n ,vung ma sat. cae vcjt Xt10c xuat h~tr'tl ~.ma.t ma sat gimnhu song SOflg vOi quang .dUOr'lgtn.r91. _ • St! bpng 1ach;.Trong sll~y dep,' v"t I~u bi dtiy v~ mQt'phfa~ b6 m~l.maaat. tran ~n Cf;icr mang 0 xyt va,matmouten h~ vOlklm 1o~1gOen'n d6 b! tach ra , khi kI;t~ cQ,n~ nangti4P. tl:l~ ch~y. N~1,I ling ,suat theo dl~u$au. dualdplon han d~ ~n 1llQI-cUav"t I~u sa xuat h~n cae vtit nl1t,dan dtin 51! bong tach v"t I~u dU~ da.ngvay. i" •• , • SI! trck: Ia ~nftPJlhOng phObitincUa ~ ~t chi tkit kh1rTlCl·$Cit Jan~~e PhilO t&:r .b!troe fa cO th~ fa cae thao~pb4f1q\u true cling ~ h9P;~ &au khi mon ,. < ~.~ .; ••• "', - • s .• h.t n6nfrl~m;. cae phAn tu.cua.Jeptrang, cae ~t nho cUa gangxam, ~epMntJ QJa Idp kim ~I chOng 63 , ma saH<hi bj mongo Nguy~n nh~n;sl! trae Ia do thanh U'ngsuat dli va ung slditnh.,t. Vi ~y, slf : ~n cUa' vet mi1do haHo~I!dng''suaf~n iii d~u eua ph~ Ii~u. 'Ai • Sl! bili ~u: xay ra trong eh~u ~u elIa mQt t cae~tkhl ma mOIIi&h Ket ~othahh tltang tae p ta b6n vang hdn mQth~e ca hai v~t I~u.·· " . • Slf ~rfChu~n ~f II~ugirta cae '~. rri~tma sat: ra trong tat ca cae d~ng ma sat tn)' ma saf ltdt; ';tfOtlg"cii cae nguy~n'd6ng cAt, tan va ~p ghep bul6ng: '~" m6n chI xciyra 'khiaie phantlf: chuy!nrakhoivung ma saf" ,',1. '. • ~ mol khi;mal'mOncaeBiYn~t'ldm ~r:sqmal ~t mn khi ma sat gl6ng vdfsl! 'phahuy chung .mol, chI 'khaenhau (, ChOla qua trfnh mon cO quan sat d! dang, cOnqua tn'nh mol gan nhlt bao , .' ,~, ,; 01- : ': -: , cUngb~u h~n' bang slf ce bAtngo. • Anh huang eua ma sat dao chltu c16n;Sl!mal m st!'thay c16iphudI'lgchuy!n c1QngseJam gtam c1~ mOrl trong ma sat tru¢ eung nhu ma sat tan. tMrit' cae chat h~tc1Qng ~ mc}t vao dau hol t! Il/ema;~t va caebltirh:t~~ ~~~'f(c18rt-h6~ g' c1i.Sl!khae nhau giita ma sat 1 chlAu ~a(lao eung giam. • cae giai c1o~nmid mon eua ~p ma sat : .' NAu coitMJehoanh Ia UfClfglan'tam ~ct'cjja ma sat, uta (fQ man iii thJCtung, ta cOdl.lOng cong mai mon chi t~ftheo thbi gti:!n.Tang eoagac ngh~n giO'a tiep tuy'nducing cong ~I mQtc1~mMt kY vCIIt hoilrih'sa xae (f!rihtOe(fQm6ll'~i'thOi (fl!m nay. 64 63 Dl10ng cong mai m6n a, 0tI0ng t~ t.hi d() m(m; 4l1Ong2:, ~ut"'i tOe d~ mono bJ<hl!'.lO f9 ~i.~tdn d.in~ ' c. KhOng co thcli ky ctViJyr8 d. Ung.ydr~~~hi ti& chiu ~ng suM t~ xaic, {h~ tl; '1<h6ng bi mDn trong·giai~n'1 , , ,.,; "<;Not·d1Uh~]Voo th! pWtn dUdhgcong mai mon ra 3 phAn tlldnQ ungvdi 3 glat d~n1n6n~. /t-dj;1. 5l! mafmon ban'aau khf·Gh~y.r.a;b&m~t chi ~t ;n ,&, ttull'tnOn 6n 'djnh: khl sLt d~ng binh thUdng (do~n 'tiling: cUBdUCShg oong) lit. QUa' trlnh: tAng'vqt- cUa t6c ~ mon, .tUong ttng vdi giai 'do~n mookhOc 1~1. Sau khi ~p rap, chi ~t tlAp xUc nhau theo cac phannHO 1&net'Ja d~ nhap nhObA,m~t. Trong glal d~n dAu,d~1i UGh·~p xuc thl/C fA .nhO; khj, tang. tai~ cQsp suAtldrl'viJ b~n~d~ngd80ldo. M~phim d~ nhAp nM~ m~tb!nenep,m~t phAn'b! pha huy 6 phAn nhO~n va 65 65 kY. Do do dlldng oong mai monphai la ~p hex>I~n tl:lC ,~c 4~~ ,ooogv~V,\J.ng~¢kh0rl9 ~~m . D~ 9M. ' 00._ ng~mc\i'mon bi!."~,tt.!qu y I~~t mon theo thai glan~'j:Shi~n"thiAt, cO th~ dlmg dltQng cong mon the<?}~'~aFlgduong ma sat hay theQ.m¢t thOng sO.d~c tnn1g khac. " ." f/ '., ,AnhJ1Uhng cUas,vrung d¢ngd6n d~.morl.,chiOOt: ~ Ttll!ct6eo th" c9:1. ~ytiuJ6 khac anh 'hUbrJg, d'n.do. m?>ncl}i 1~lXetv~~~fa~nh,90 khf fa quan tAlJl<!tinslf rung do.~9;.Kbi nghiltn cuu slf'mai mon cac chi tkit cUa tNc truy6F'!d¢ng may ~~'" ngltOi taxac d!nhbang thlfC 'ngh~~t J;.r~l/rung d¢ng ~~ ~,i.lt9rg! du' khOn9,,Idr'l h(jO 10 - 2~ t:Ji trQng sa dl:ing trung binh, ciinglam tang ,dang ~~ cltang.dO.rnai m6n. " . , J' r' : ., .•• ,t<h.i~on6n cac b~n d~ng thay dOicua ~t I~u a vung~pxuc 9ci~~;mclt I3p ghe~,t:J,i,~9ng, do.ng ,da lam )(u~th,itv.;dol1Q ~~ncam,U'ng,thaYd6i troFl9Idp:b~n ;;,"~ , •• -' .•••••.• _'" J,. __.' ',' l .:' ''',' , .i r ,dang Sl! ttla,y.'deli cua tCtthOn9,f90ra SUcd~n ,d~ng cam'li'ng trong, khuog (hinh thaijh 40 cae 'chL$fl3p gh~pl.,Trl'l~",qQ~,tcUa)dP" 0 xyt,v.a, Ch~tboi. .trdna'nh "11 " "J. •••.•• ' i-" " , • ·-:f c.' ._).J,j .__ ' ,•. hll'dDgr<4~nd~n tra va th6 _h~n Jrqng, v~n.gti6p xuc Ia ._.~,~, ',,,t ••. ,~~.:- '.' '. ":'. ,i •••. 'J'"i:, . : - ,'~-~"', n~uX~nbn~~",~~; slf h,()~thOa,;P6 .m~t,,va SLfphat,~n mal rngn °.x.y hoa. Slf ~m JhLfc'-vaeac qua trinhan ,m69,j1~.~ :hpa)amg~m_' {~6(t~9 cU~ m6i.,~p g~ep-':nit nh~u. H~n tll<;'l1gnay gp,i fa h~n tll909 _(f~.n.,d¢ngllfc cUa~sVrt!~~m~n. ;~L!a(ic1 ~as~ ~~re~:'~h,ungb¢ ~f} ghep khac nhau {b¢ truy6n ~~, (tang,' mOi ghep ) d~ ngh~n Cli'uthLfcnghi6m h.~n tU<;'I1gnay. Chung ttll99._~~.taitr6ngia thr ngh.~&'vdldclctin~' bi6n d¢, ~n ,sOc4'i1~i trRng dQngLin.gv~ gfc:itr!,thlfc,t6 khi sa dl:lng. 66 Tkin him" do biAnd~, tOcd¢ thay d6i cUaterthOng, d tre gia~ cac b6 m~'t ti6p xuc, nh~t d¢, danh gici o~ng xu~f h~J1d~n Uch dua tac' dl}ng cUa tai trQ 'd¢ng wtha ngh~m so sanh ~ m6fl.Ter .~~~qua IJg~~m dlfngduQC cac dUdng,cong cUCl.sLi'cd.kln d¢ ; f, _ "._ .• ' _ ".,' r, , , c.a1,1lU'ng,plJl:Ithu¢c bi6n d¢ va tAn.sOcu~ iai trq d¢ng. N~u R~n~9khong d6i,sLi'c d~n d¢nq camY~.~. ~ vQ( tan ~. taitrQng d¢ng. Do d6.• terthOng ~m . It ,- -' ,,_,r " ,- . p -" .,.,.~". _ I! ,,_ ,', , - , ; th~y'.d6tnhi6u nhtJtQXYI19 tAn sOcao cua ta~trQng.'N, .1' t}~• SI '. :' _ :L.' - -!, _ - i' i" < .~n~·,~~nfJ,,~6i, sU:c.~~.n d¢n9,.can,'l,U'ng,cilnQ,.,ta tt!~ t>~nd¢ tai trQng nhung ch,~m ,!~JL!angtl( due' , ~- , _.,• ' '_ .•. r' :,_ 1 It,.' , iL'\' - cong d¢ cUngvO'ngtheo,ap sutJt. '. !~'" >;.! '. ' . Slf .tan~.b~n. d¢ #i ,V~~g.<1¢f,l,~IarTlxy~t h~n ,,- i '. - , _' - '- - ,., " ~, "vt; ·' , -:' ' ;, , gu~ trin~t~1 riguc;Jcnhau. Slf tang cua ter thongca •.;~ dart:~~n' s~ tang cua h~u d~n th! va S.lfgiamq~ d14ntrb lam hl6u d~n thti g;am theq. Theo quan d~ d~,n '~¢ng Ilfc, 1a(frQ~.9'd¢ngoo'mn'SO cao va bk\n . :'- L' -" ,- . ,'::' ' ',' ~. _.,:, '_.,, _, ~!1o.~.cQ I~'rih~t n~ncan Ull[c h~n'nhltng ~u y ~u nAngcao tu6i thQcUa chi OOtmay: nhu ,giam.taittQ' d¢ng e ph~n ~r{s6 cao va ~o ra lhlg su~t ti$p'X:~c . d!nht]qQ!U'ng suAt d~.,,~~nq9Idp b~ m~t bitin d~ng,_la' dAu ap suAt.va giam d~n irb 'tkip xUc trOn .~ se.dl ;chuy~nch9"~'tQcktli rna siit, sJdl:lng; ch~(bOi trdi;l d • ",t '.',-,,', '; •.• 11I'. , .•• d~nJ slt~t.!ng .cac cl)tJtbao v~ • p~~n.~,i d~ng, mon Anh h.uRng:;ef~di~~"~n' sat d~n dqn~ ":l0n:, ; e~~n ~i dCJng.mo~: +"HaQ m6n 0 xy h6a: Ia quatrfnh pha hoai dA d~n bi r;;~t.,~ t~t trong 'khi' m~ sat, ?O tJdng ta~ gl cac Idp kim ~1b6-m~t hoqt tlnh b! bk\n dqng deo va •• -\ 67 I· .•.••• ! Ii 1/'\ 61 xy'Ctia khOng -Idlr h~ cUa dau bOHrdn6l'hap 'thl:' tr~n M 'm~t gay ita',CHao man 0 xy hoa th$h~n 'tJ Sl! hinh thanh cac Idp mang hap thl:' h6a hQC,mahgcUa cae du:rig dich '~n;' enatac hQP'chathda' hQc glOa' kim' ~i va 0 xy va 'il!'Dong' tach cac fap tTlangay ra khol ~. 'm~t·~sat. S\!ih'~(1'moh,:~ijJHo~Ha qua- trinh 6n dtnh ttflttW(d.~·sl}' ~n'ba~g' ~rigg~ pha ~t'vah61 ph~cciicTdp. mcihg O'xyt 'vii !'(J~(;tnmg"chd'dliti ~n sa dl:'ng' 6inh thtthng ro~d8c~ ~h ma sat. ' . , . + Mal m6n va hl! hong do mai m6n:ta qua trinh pna 'ho.fl>6 m~t chi t~rkt1icO"m6Itru~g mal trong w~mar sat., , , ' . ',' ", ,~ co 2'd$fig mat meh:' malman-tc:I h6'a ~ ni-~fmon .echoc - 0',. ' .,;ill M8fftndhcd hOaxay ra khi: .":I!er :;c- HkIt-f m '> 0, 6 .•.• ·:dOceli'ng klm loaI , k 'r:;, ' . Hm:'(fQ rong~lmai. C) ;'i()l Malmon Cd hQc'xay ra khl KT < 0,6, _ "'.' ' " . - ",.' ~ , ;.' " ' ~ ."~l'Ig, '.nay thuQc v!' nhang qua trinh hl! hong kh~rig 'ChopHepxay ra khl cOrTla sat. .' ' ,,• iTtdc 1a .qua trinh hl! hong khOng cho phep cUa cac ~ m~t ma sat do ktit qua cUa sl.! hinh thanh cua m6i.nk6t klm 1o~lc~c b¢, sil6f6n d~ng va sq phci huy cae Mrfk6t ay, kern theo ~e bong' ~eh cae h~t klm Io~i :haybam'ictfnn,cac h~tay~n ~ m~t tkip~xuc, . ·:TrOc xuAth~n khi rtta'sattrl!¢, van6c d¢ d!ch chuy.ri'tfrdng'd6tnhova cip su~h vitc;rtqua glOi h~n chciy tr6n nnQ'ilg'id~n Mp xuc thl}'c'kIll khOng cO 1dJ>dciu bOi 68 [...]... trC10 ldp.mang 0 xyt t>ao,v~,ng,an,qacn Trong ch va i' ,-, -, " ' • ).$ , • ," '_ -" '- ,',., ,~~Ongtd~nghU hong~y,cO th~ix4Alhit~-flgay tru:ang, ,bQP ma eat lan, ", '" - Troc nhit)t:slJ xl,I4i hi6n cacliAn~t>_, • ' : :,': , ca tro '",: • ' • t •• kim ~,~; ,Y-9n~,qua1,rinh r troc n~* ado sl!n~ng n~d.m,m' -' .- r , '" r, ;bk);o d~~9; vfI bl6n q~rw:~a ca9,~rpc}t... tichJrUa chi ti6 m~y Khi'~ep lun th~tioh chl'~ -, ' thayd~1AAUR' kh '-. 1 ', '-. :' ,-, ,' lyoc;rng veingIQnguy6n.• I~[l xa.yra tro"Qi l(hi,fTUI ~ : :ij,llh "•• . nh~ d¢ caoda Me t1tnh kha na tqora,c;cicmacmaplattna. ~ , " . i·i.·, 4 ," ;-& quot ;- :·U· ~./ - - 4< t ~ ~ ' •. __ : - - ••• oJ ~ .~• ! . ~- ,,,' t, ••. 111 __ .' __ ••••••••. 57 CHUaNG 5 , ~ v , MON CUA CAPMA SAT • f· ,- " A ' , VI cm TIET MAY, .1. Khai nitm va,pla •• l~i cae .dtng mai moo va hu hOng t,-ong chi tiit may•. )<hal o~mco. ',' ", ,~ co 2'd$fig mat meh:' malman-tc:I h6'a ~ ni-~fmon .echoc - 0',. ' .,;ill M8fftndhcd hOaxay ra khi: .":I!er :;c- HkIt-f m '> 0, 6 .•.• ·:dOceli'ng