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  • CNC Lathe vs CNC Turning Centre: Umahluko Isicelo

    2024-06-04

    Umatshini weComputer Numerical Control (CNC) uguqule ishishini lokuvelisa, ukubonelela ngemveliso echanekileyo nesebenzayo yamacandelo ahlukeneyo. Iintlobo ezimbini ezisetyenziswa ngokuqhelekileyo koomatshini be-CNC zizileyile kunye namaziko okuguqula. Nangona zombini ziyilelwe ukuba machining iinxalenye cylindrical, zineyantlukwano zabo ngokwemigaqo isicelo.

    I-CNC lathe sisixhobo somatshini esijikeleza i-workpiece kwi-axis yayo ukuze yenze imisebenzi efana nokusika, ukugrumba, ukugquma, kunye nesanti. Kwelinye icala, iziko lokujika le-CNC luguqulelo oluphambili lwelathe eneempawu ezongezelelweyo ezifana nesakhono sokusila, izixhobo zokusebenza eziphilayo, kunye neesekondari zokuphotha.

    Kweli nqaku, siza kuxubusha umahluko phakathi kwe-lathe ye-CNC kunye neziko lokuguqula i-CNC ngokwemigaqo yesicelo, ukukunceda uqonde ukuba nguwuphi umatshini olungele iimfuno zakho zokuvelisa.

    Yintoni iCNC Lathe?

    ACNC lathe sisixhobo somatshini esijikeleza i-workpiece kwi-axis yayo ukwenza imisebenzi eyahlukeneyo efana nokusika, ukugrumba, ukukruqula, kunye nesanti. Isebenzisa ulawulo lwekhompyutha ukuguqulela imiyalelo ecwangcisiweyo kwimiyalelo yentshukumo yomatshini. I-lathe ineenxalenye ezimbini eziphambili- i-headstock kunye ne-carriage. I-headstock iqulethe i-spindle engundoqo ebamba kwaye ijikeleze i-workpiece, ngelixa i-carriage ihamba ngobude beendlela zokulala ukulawula izixhobo zokusika.

    Iileyile ze-CNC zisetyenziselwa ubukhulu becala ukwenza izixhobo ezimilise icylindrical okanye iconical ngokuchaneka okuphezulu kunye nokuchaneka. Zingasetyenziselwa ukujongana, ukukrola, ukuthunga, kunye nemisebenzi ekruqulayo. Ngokukwazi kwabo ukuphindaphinda ukusikwa okuyinkimbinkimbi ngokuphindaphindiweyo, aba matshini balungele ukuveliswa kwevolumu ephezulu yamalungu alula.

    Iileyile ze-CNC zifumaneka ngokobukhulu obahlukeneyo, ukusuka kwiimodeli ezincinci zedesktop ukuya koomatshini abakhulu bemizi-mveliso abakwaziyo ukuphatha umsebenzi onzima. Zihlala zisetyenziswa kwimizi-mveliso yeemoto, i-aerospace, kunye nezonyango ukwenza izinto ezinje ngeeshafti, ipistons, kunye neevalvu.

    Yintoni i-CNC Turning Centre?

    AIziko lokujika le-CNC luguqulelo oluphambili lweleyile eneempawu ezongezelelweyo ezifana nesakhono sokusila, izixhobo eziphila kuzo, kunye nezisongelo zesibini. Idibanisa imisebenzi ye-lathe kunye neziko lomatshini kumatshini omnye, ukubonelela ukuguquguquka okukhulu kunye nokusebenza kakuhle kwimveliso.

    Iziko lokujika linendawo yokusonta ephambili yokujikelezisa i-workpiece kunye ne-spindle yesibini yokwenza imisebenzi efana nokugaya, ukubhola, ukucofa, kunye nokugrumba ngaphandle kwendawo. Oku kuphelisa isidingo sokudlulisa i-workpiece phakathi koomatshini abahlukeneyo, ukugcina ixesha kunye nokunciphisa iimpazamo.

    Amaziko okuguqula i-CNC aqhele ukusetyenziselwa imisebenzi enzima kunye ne-multi-tasking machining. Banokuvelisa iimilo ezintsonkothileyo kunye neempawu kuzo zozibini iziphelo zecandelo ngaxeshanye, zibenza balungele ukwenza iindawo ezinjengeegiya, iishafti ezinezitshixo okanye i-splines, kunye nezinto ezintsonkothileyo zonyango.

    Ukongeza kwizakhono zabo eziphambili, amaziko okuguqula anika amaxesha omjikelezo okhawulezayo kunye nokuchaneka okuphezulu xa kuthelekiswa neentambo ze-CNC. Zisetyenziswa ngokubanzi kumashishini afana ne-aerospace, ukukhusela, kunye neoli kunye negesi ngokukwazi kwabo ukuvelisa iindawo ezinzima kunye nokunyamezela okuqinileyo.

    Izahlulo eziphambili phakathi kweCNC Lathe kunye neCNC Turning Centre

    Naziiiyantlukwano ezininzi eziphambili phakathi kwe-CNC lathe kunye nokujika kwe-CNCiziko, ezenza zilungele izicelo ezahlukeneyo.

    Yila

    Uyilo lwelathe ye-CNC kunye neziko lokuguqula i-CNC lihluka kakhulu, lichaphazela ukusetyenziswa okujoliswe kuko kunye namandla. Ilathe ye-CNC ilula kuyilo kwaye ijolise ikakhulu ekujikeni imisebenzi apho i-workpiece ijikeleza ngelixa isixhobo sokusika sihlala simile. Iquka i-spindle engundoqo, i-headstock, kunye nenkqubo yokuthwala elula ukuququzelela iintshukumo zomgca.

    Kwelinye icala, iziko lokujika le-CNC lintsonkothe ​​ngakumbi kuyilo kwaye lidibanisa imisebenzi emininzi ngaphaya kokujika nje. Ibandakanya i-spindles ezongezelelweyo, izixhobo eziphilileyo, kwaye zihlala zibandakanya i-Y-axis, eyenza ukuba yenze i-milling, i-drilling, kunye nokusebenza ngokucofa ngaphakathi kokuseta okufanayo. Olu yilo olunemisebenzi emininzi luvumela iziko lokuguqula ukuba liphathe imisebenzi eyinkimbinkimbi kunye neyohlukeneyo yomatshini ngaphandle kwesidingo sokudlulisa i-workpiece kumatshini ohlukileyo.

    Le yantlukwano yoyilo yenza i-CNC lathes ilungele ngokuthe ngqo, imisebenzi yokuvelisa umthamo ophezulu ngelixa amaziko okuguqula i-CNC afaneleke ngcono kwiimfuno eziyinkimbinkimbi, ezininzi zenkqubo yokuvelisa.

    Imisebenzi

    Omnye umahluko obalulekileyo phakathi kwelathe ye-CNC kunye neziko lokujika le-CNC luluhlu lwemisebenzi abanokuyenza. Njengoko bekutshiwo ngaphambili, i-lathe igxile ikakhulu kwimisebenzi yokuguqula efana nokujongana, ukugoba, ukugrumba, ukuthunga, kunye nokukruqula. Aba matshini balungele ukuvelisa i-cylindrical elula okanye i-conical components kunye nokuchaneka okuphezulu.

    Ngeli xesha, iziko lokuguqula libonelela ngokwanda kokuguquguquka kunye nokukwazi ukuphatha iinkqubo ezininzi ngaxeshanye. Inokwenza imisebenzi eyahlukeneyo yokungqusha efana nokungqusha ubuso, ukuphelisa ukungqusha, kunye nokugrumba usebenzisa isixhobo esiphilayo ngelixa i-spindle ephambili ijikelezisa i-workpiece. Esi sikhundla esiphezulu sivumela ukuba iijiyometri ezintsonkothileyo zenziwe ngoomatshini ngokufanelekileyo kulungiselelo olunye.

    Ngelixa bobabini oomatshini babelana ngemisebenzi eqhelekileyo esisiseko efana neentshukumo zomgca kunye nokujikeleza, uluhlu lwabo lwemisebenzi lubabeka bucala kwaye lenza enye ilunge ngakumbi kwizicelo ezithile kunomnye.

    Ukuba bhetyebhetye

    Ukuguquguquka ngomnye umahluko obalulekileyo phakathi kwe-CNC lathe kunye neziko lokuguqula i-CNC. I-lathe yenzelwe ukujongana nokuveliswa kwevolumu ephezulu yamacandelo alula kunye nokuhluka okuncinci kuyilo. Inokuvelisa ngokufanelekileyo iindawo ezifanayo ezininzi, iyenza ilungele imveliso yobuninzi.

    Kwelinye icala, aiziko lokujika inika ubhetyebhetye olukhulu njengoko inokwamkela uyilo olwahlukeneyo kunye nemathiriyeli ngaphandle kokufuna uhlengahlengiso olubanzi okanye utshintsho lokuseta. Ubuchule bayo bokwenza imisebenzi emininzi buyenza ikwazi ukujongana neendawo ezintsonkothileyo ezineempawu ezahlukeneyo kunye neejometri kwiseti enye ngokukhawuleza, ukunciphisa ixesha lokuvelisa kunye neendleko.

    I-flexibility enikezelwa liziko lokuguqula yenza ukuba ifaneleke ngakumbi kwimveliso yomthamo ophantsi ukuya ophakathi weendawo eziqhelekileyo, ngakumbi kumashishini afana ne-aerospace kunye nezonyango apho iidizayini zenxalenye zihlala zitshintsha.

    Ukuntsonkotha

    Ngokumalunga nobunzima, iziko lokujika le-CNC ngokungathandabuzekiyo lihambele phambili ngakumbi kunelathe. Uyilo lwayo lubandakanya i-spindles ezininzi, izixhobo eziphilayo, kunye ne-Y-axis, eyenza ikwazi ukuphatha imisebenzi eyahlukeneyo ngexesha elinye. Oku kwandisa ukuntsonkotha kwayo yonke kodwa ikwabonelela ngokuguquguquka okukhulu kunye nokusebenza kakuhle kwimveliso.

    Ilathe, kwelinye icala, inoyilo olulula olunamalungu ambalwa ashukumayo kunye nokusebenza. Oku kwenza kube lula ukusebenza kunye nokugcina kodwa ukunciphisa amandla ayo xa kuthelekiswa neziko lokujika.

    Ngokuxhomekeke kwiimfuno zenkqubo yokuvelisa, nokuba nguwuphi na umatshini unokukhethwa. Kumalungu alula anokusebenza okuncinci, i-lathe inokwanela. Nangona kunjalo, kwiindawo ezinzima ngakumbi ezifuna iinkqubo ezininzi, iziko lokujika libonelela ngezakhono eziyimfuneko.

    Umthamo weMveliso

    Omnye umahluko wokugqibela phakathi kwe-lathe ye-CNC kunye neziko lokujika le-CNC lumthamo wabo wemveliso. Njengoko bekutshiwo ngaphambili, iileyile zisetyenziselwa ukuvelisa umthamo ophezulu wezinto ezifanayo. Uyilo lwabo olulula luvumela ukuveliswa ngokukhawuleza kunye namaxesha okujikeleza, okubenza balungele ukuveliswa kwezinto ezininzi.

    Kwelinye icala,amaziko okujika a ifaneleke ngcono kwimveliso yomthamo ophantsi ukuya ophakathi ngenxa yesakhono sabo esiphucukileyo kunye nokukwazi ukuphatha uyilo olwahlukeneyo kunye nemathiriyeli ngokufanelekileyo. Bakwanikezela ngamaxesha amafutshane okuseta xa kuthelekiswa namaziko omatshini emveli, ewenza alungele imveliso yebhetshi encinci enokutshintsha rhoqo.

    Ngoko ke le yiyantlukwano ephambili phakathi kwe-CNC lathe kunye neziko lokujika le-CNC. Ngelixa zinokubonakala zifana xa uqala, uyilo, ukusebenza, ukuguquguquka, ukuntsonkotha, kunye nomthamo wevolumu yemveliso ubabeka bucala kwaye ubenze bafanelekele ngakumbi iimfuno ezahlukeneyo zokwenziwa. Ukuqonda lo mahluko unokunceda abavelisi bakhethe owona matshini ufanelekileyo ukuhlangabezana neemfuno zabo ezithile kunye nokwandisa iinkqubo zabo zokuvelisa.

    Indlela yokukhetha phakathi kweCNC Lathe kunye neCNC Turning Centre

    Xa usenza isigqibophakathi kwe-lathe ye-CNC kunye neziko lokujika le-CNC , kukho iinkalo eziliqela ekufuneka ziqwalaselwe. Okokuqala, uhlobo lwenxalenye okanye icandelo eliveliswayo lidlala indima ebalulekileyo. Kwiindawo ezilula ze-cylindrical okanye ze-conical ezinomthamo ophezulu wokuvelisa, i-lathe ingaba yinto ekhethekileyo ngenxa yokusebenza kwayo kunye neendleko eziphantsi.

    Kwelinye icala, iindawo ezintsonkothileyo ngakumbi ezifuna iinkqubo ezininzi ezinemveliso ephantsi ukuya kwephakathi, iziko lokujika liya kubonelela ngokuguquguquka okukhulu kunye nokuguquguquka.

    Uhlahlo-lwabiwo mali yenye into ebalulekileyo xa ukhetha phakathi kwaba matshini. Iilathesi ngokubanzi zixabisa ngaphantsi kunamaziko okujika ngenxa yoyilo lwazo olulula kunye nokusebenza okumbalwa. Ngoko ke, ukuba imiqobo yohlahlo lwabiwo-mali ingumba, i-lathe inokuba lolona khetho lusebenzayo.

    Ukongezelela, kubalulekile ukuqwalasela indawo ekhoyo kwindawo yokuvelisa. Amaziko okuguqula afuna indawo engaphezulu yomgangatho ngenxa yobukhulu bawo obukhulu kunye nezixhobo ezongezelelweyo ezifana nezixhobo eziphilayo kunye neentambo ezininzi. Xa kuthelekiswa, iileyile zincinci kwaye zithatha indawo encinci.

    Ekugqibeleni, abavelisi kufuneka bavavanye ngononophelo iimfuno zabo zemveliso ethile kwaye bazilinganise ngokuchasene nesakhono kunye nemida yomatshini ngamnye phambi kokuba benze isigqibo. Ukubonisana neengcali kunye nokuqhuba uphando olucokisekileyo kunokunceda ekukhetheni owona matshini ufanelekileyo ukuze usebenze kakuhle kunye nenzuzo.

    Ngaba ukudityaniswa kwabo bobabini oomatshini kukho?

    Ewe,oomatshini bokudibanisa ezibandakanya zombini i-lathe kunye nesakhono seziko lokujika zikhona. Aba matshini baxubekileyo babonelela ngezona zinto zibalaseleyo zehlabathi, ngokukwazi ukwenza imisebenzi eyahlukeneyo yokuguqula ngelixa bekwazi ukungqusha kunye nokugrumba.

    Uyilo lwe-hybride luvumela ukunyuka kokuguquguquka kunye nokusebenza kakuhle kwimveliso njengoko kuphelisa imfuno yokumisela ezininzi kunye nokunciphisa amaxesha okujikeleza. Ikwagcina indawo kumgangatho wemveliso ngokudibanisa oomatshini ababini babe mnye.

    Nangona kunjalo, aba matshini abadibeneyo basenokungafaneleki kuzo zonke iintlobo zeemveliso njengoko zihlala zinemida ngokobukhulu kunye nobunzima xa kuthelekiswa neentambo ezizimeleyo okanye amaziko okuguqula.

    Abavelisi kufuneka bavavanye ngononophelo iimfuno zabo zemveliso ngaphambi kokuba batyale imali kumatshini oxutyiweyo ukuze baqinisekise ukuba bayakwazi ukumelana neemfuno zabo. Kufuneka kwakhona baqwalasele ugcino olunokubakho kunye neendleko zokusebenza zomatshini odibeneyo xa kuthelekiswa nokuba noomatshini abahlukeneyo bomsebenzi ngamnye.

    Kwakhona, njengoko itekhnoloji iqhubeka nokuhambela phambili, oomatshini be-hybrid baya baphucuka ngakumbi kwaye bayakwazi ukuphatha imisebenzi entsonkothileyo. Ke ngoko, kubalulekile ukuba uhlale uhlaziywa kuphuhliso lwamva nje kule ndawo ukufumanisa ukuba umatshini wokudibanisa uya kuba lutyalo-mali olufanelekileyo kwinkqubo yakho yokuvelisa.

    Iimpazamo omele uziphephe xa ukhetha phakathi kweCNC Lathe kunye neCNC Turning Centre

    Xa uthatha isigqibo phakathi kwe-lathe ye-CNC kunye neziko lokujika le-CNC, kukho iimpazamo eziqhelekileyo ekufuneka abavelisi baziphephe. Nazi ezinye zazo:

    • Ukukhetha ngokusekelwe kwixabiso kuphela : Nangona uhlahlo lwabiwo-mali lubalulekile, akufuneki lube lolona phawu ekuthathweni kwezigqibo. Umatshini onexabiso eliphantsi unokugcina uxabisa ngaphezulu ngokwemiqathango yogcino kunye neendleko zokusebenza ukuba awukwazi ukumelana neemfuno zemveliso ngokwaneleyo.
    • Ukungakhathaleli ukuvavanya iimfuno zemveliso : Kubalulekile ukuvavanya ngokucokisekileyo iinxalenye ezithile eziveliswayo kunye nokusebenza kwazo okufunekayo phambi kokukhetha umatshini. Ukungaphumeleli ukwenza oko kunokukhokelela ekukhetheni umatshini onganelanga ongahlangabezani nazo zonke iimfuno zemveliso.
    • Kungacingelwa ukukhula kwekamva : Xa utyala imali kumatshini we-CNC, abavelisi kufuneka baqwalasele izicwangciso zabo zokukhula kwixesha elizayo. Ngaba baya kufuna umatshini omkhulu okanye ophucukileyo ezantsi komgca? Oku kunokubasindisa ekutshintsheni okanye ekuphuculeni izixhobo zabo ngokukhawuleza kunokuba bekulindelekile.
    • Ukungahoywa kweendleko zokugcina kunye nokusebenza : Njengoko kukhankanyiwe ngaphambili, ixabiso lokuqala lomatshini akufanele libe yindleko kuphela eqwalaselwayo. Abavelisi kufuneka bajongane neendleko zokuwugcina kunye nokusebenza ukumisela ukonga imali komatshini.

    Ngokuphepha ezi mpazamo, abavelisi banokuvavanya ngcono ukhetho lwabo kwaye bakhethe umatshini ofanelekileyo kakhulu kwiimfuno zabo zokuvelisa, okukhokelela ekwandeni kokusebenza kunye nenzuzo.

    Qhagamshelana neBreton Precision yokuGuqulwa kweCNC yakho kunye nezinye iiMfuno zokuVelisa

    I-Breton Precision yindawo yakho yokumisa enye yazo zonke izinto zakhoI-CNC Lathe kunye neemfuno zeziko lokuguqula i-CNC . Ngetekhnoloji yethu ephucukileyo kunye neengcali ezinezakhono, sinokubonelela ngezinto eziguquliweyo ezikumgangatho ophezulu kwiiprojekthi zakho ezizodwa. Sinikezela ngoluhlu lweiinkonzo kuqukakwi-call CNC turning, amaxesha okukhokela ngokukhawuleza, kunye ne-24/7 inkxaso yobunjineli ukuqinisekisa inqanaba eliphezulu lokwaneliseka kwabathengi.

    Inkampani yethu izibophelele ekuziseni iindawo eziguqukileyo ezikumgangatho ophezulu ngokuchaneka kunye nokusebenza kakuhle. Sinenkqubo engqongqo yokulawula umgangatho ukuqinisekisa ukuba zonke iimveliso zethu ziyahlangabezana nemigangatho elindelekileyo kwaye azinaziphene.

    Ngezixhobo zethu zangoku kunye nezibonelelo, sisebenza ngokukhethekileyoCNC machining,ukubumba inaliti yeplastiki,ukwenziwa kwamaphepha esinyithi,ukugalela ngevacuum, kwayeUshicilelo lwe-3D . Iqela lethu leengcali linokusingatha iiprojekthi ukusuka kwimveliso yeprototype ukuya kwimveliso yobuninzi ngokulula. Sikwanikezelaamaxabiso okhuphiswanokunye namaxesha okukhokela ngokukhawuleza, uqinisekisa ukuba iiprojekthi zakho zigqitywe ngexesha elifanelekileyo kwaye ngendlela eyongayo.

    NgeBreton Precision , siyakuqonda ukubaluleka kokuchaneka nokuchaneka kwimveliso. Yiyo loo nto sizamela ukuzuza ukunyamezelana ukuya kutsho ku-±0.005” kwiintsimbi ezisilileyo, sifikelela kwimigangatho ye-ISO yazo zombini iiplastiki kunye neentsimbi.

    Qhagamshelana nathi kuinfo@breton-precision.com okanye usitsalele umnxeba ku-0086 0755-23286835 kuyo yonke i-CNC yakho yokujika kunye nezinye iimfuno zokuvelisa. Iqela lethu leengcaphephe ezizinikeleyo liyafumaneka 24/7 ukukunika ezona zisombululo zilungileyo zokuyila, ukukhetha izixhobo kunye nokulawula amaxesha okukhokela. Masikuncedeyiza neeprojekthi zakhoukuze siphile ngeenkonzo zethu ezikumgangatho ophezulu zokuguqula i-CNC.

    Ii-FAQs

    Ngowuphi umahluko omkhulu phakathi komatshini we-lathe we-CNC kunye neziko lokuguqula i-CNC?

    Oomatshini be-lathe be-CNC zizixhobo zoomatshini ezikhethekileyo eziyilelwe ngokuyintloko ukusika, ukugalela isanti, ukugquma, kunye nezixhobo zokomba. Iziko lokuguqula i-CNC, kwelinye icala, libandakanya izakhono ezongezelelweyo ezifana nokusila kunye nokucofa, okwenza kube yindlela eguquguqukayo kwiinkqubo zomatshini ezinzima.

    Amaziko okujika athe nkqo xa ethelekisa neeleyile zemveli ngokwezakhono zomatshini?

    Amaziko okuguqula ngokuthe nkqo luhlobo lomatshini we-lathe we-CNC osebenza ngokujikeleza ngokuthe nkqo. Olu lungelelwaniso luluncedo kakhulu kwizinto ezinzima, ezinkulu. Ngokwahlukileyo, iileyile zesiNtu zibonakalisa i-spindle ethe tyaba kwaye ifaneleka ngcono kwiiprojekthi ezilula, ezincinci.

    Zeziphi iindlela inkqubo yobuchwephesha be-CNC kumaziko okujika yahluke ngayiphi indlela kumatshini we-lathe we-CNC?

    Inkqubo yomatshini we-CNC kumaziko okuguqula ihluke kumatshini we-lathe we-CNC kuba amaziko okuguqula anokwenza imisebenzi yokuguqula kunye nokugaya ngaphandle kokutshintsha ukuseta, okwandisa ukusebenza kakuhle kwemveliso. Oomatshini be-lathe be-CNC, ngelixa besebenza kakhulu, bagxile ngokubanzi kwimisebenzi yokuguqula kuphela.

    Kutheni le nto umenzi enokukhetha i-lathe ye-CNC ngaphezulu kweziko lokujika le-CNC kwizicelo ezithile?

    Abavelisi banokukhetha i-lathe ye-CNC ngaphezu kweziko lokujika le-CNC ukwenzela izicelo ezifuna imisebenzi yokuguqula ezinikeleyo ngaphandle kwesidingo seenkqubo ezongezelelweyo zokusila okanye zokomba. Iileyile ze-CNC zilula kwaye zingabizi kakhulu kunamaziko ojiko athe tye, awenza alungele imisebenzi yomatshini ethe ngqo.

    Ukuqukumbela

    Ukuqukumbela, isigqibo phakathi kwelathe ye-CNC kunye neziko lokujika le-CNC ekugqibeleni sixhomekeke kwiimfuno ezikhethekileyo zomenzi. Oomatshini be-Hybrid banokunika ukuguquguquka okwandisiweyo kunye nokusebenza kakuhle, kodwa basenokungafaneleki kuzo zonke iintlobo zemveliso. Kubalulekile ukuvavanya ngononophelo iimfuno zakho zemveliso phambi kokuba utyale imali kuwo nawuphi na umatshini.

    Ukongeza, kubalulekile ukuphepha iimpazamo eziqhelekileyo ezinjengokukhetha ngokusekelwe kwixabiso kunye nokutyeshela ukuqwalasela izicwangciso zokukhula kwexesha elizayo.Breton Precisioninikeza umgangatho ophezuluIinkonzo zokuguqula i-CNCkunye nezinyeizisombululo zokuvelisa ngamaxabiso okhuphiswano kunye namaxesha okukhokelela ngokukhawuleza. Qhagamshelana nathi namhlanje ngazo zonke iimfuno zakho zokuvelisa!