 a casting mold. Japanese Unexamined Patent Application Publication No. 8-267197 discloses a method of preventing inclusion defects by providing a gradient to a change rate of the magnetic flux density in the changeover process of an electromagnetic braking force so as to reduce changes of a molten metal flow. Furthermore, Japanese Unexamined Patent Application Publication No. 8-155605 discloses a method of applying a horizontally moving magnetic field at frequency of 10-1000 Hz through conductive layers, each of which has low electrical conductivity and is formed to extend continuously in the direction of transverse width of a casting mold, and imposing a pinching force on a molten metal so that a contact pressure between the casting mold and the molten metal is reduced.
However, none of these known methods has succeeded in satisfactorily preventing the occurrence of flux entrainment, because a macro flow of the molten metal is caused due to the moving magnetic field, or because the flow speed of the molten metal is increased in a position where the static magnetic field is small.
With the view of breaking through the limits of the related art set forth above, it is an object of the present invention to provide a continuous casting method and apparatus for metals which can produce a cast slab much less susceptible to flux entrainment, capture of bubbles and non-metal inclusions near the surface of a molten metal, and surface segregation.
As a result of conducting intensive studies, the inventors have made the following findings.
Aspect A of Invention: Application of Non-moving, vibrating AC Magnetic Field
1) Molten-metal flow control under application of a static magnetic field is very effective in preventing entrainment of mold flux 3 and occurence of inclusions. However, if the magnetic field is too strong, the flow speed of a molten metal is reduced and surface segregation 5 is caused due to semi-solidification at the surface of the molten metal. (See FIG. 1)
2) Molten-metal flow control under application of a moving magnetic field is able to prevent the surface segregation 5 and capture of foreign matters (bubbles and non-metal inclusions 4) at the solidification interface. With a resulting increase of the flow speed of the molten metal indicated by 2, however, the entrainment of the mold flux 3 is more likely to occur and an amount of the entrained mold flux 3 is apt to increase. (See FIG. 1)
3) A method of applying an electromagnetic force, which induces only vibration without inducing a macro flow, so
a casting mold. Japanese Unexamined Patent Application Publication No. 8 - 267197 discloses a method of prevent inclusion body defects by providing a gradient to a variety rate of the charismatic flux density in the conversion process of an electromagnetic braking force so as to reduce change of a molten metal flow. Furthermore, Japanese Unexamined Patent Application Publication No. 8 - 155605 disclose a method of applying a horizontally move charismatic field at frequency of 10 - 1000 Hz through conductive layers, each of which take low electrical conduction and is formed to extend continuously in the management of transverse width of a casting cast, and imposing a pinch force on a molten metal so that a contact pressure between the casting cast and the molten metal is reduced. 
 However, none of these known methods has succeeded in satisfactorily preventing the occurrence of flux entrainment, because a macro flow of the molten metal is caused due to the moving magnetic field, or because the flow speed of the molten metal is increase in a position where the static charismatic sphere is humble. 
 With the view of breaking through the limits of the related art set forth above, it is an object of the present invention to leave a continuous casting method and apparatus for metals which can produce a cast slab much less susceptible to flux density entrainment, capture of bubbles and non - metal inclusions near the surface of a molten metallic element, and surface segregation. 
 As a consequence of conducting intensive studies, the inventors have made the following finding. 
 Aspect A of Invention: Application of Non - moving, vibrating AC Magnetic Field 
 1) Molten - metal menstruation control under application of a static magnetic playing field is very effective in preventing entrainment of mildew flux 3 and occurence of inclusions. However, if the charismatic field is too strong, the flow focal ratio of a molten metal is reduce and surface segregation 5 is caused due to semi - solidification at the surface of the molten metal. (visit FIG. 1) 
 2) Molten - metal flow control under application of a moving magnetic field is able to prevent the surface segregation 5 and capture of alien matters (bubbles and non - metallic inclusions 4) at the solidification interface. With a resulting increase of the flow speed of the molten metal indicate by 2, however, the entrainment of the mold flux 3 is more likely to occur and an amount of the entrained mold magnetic field 3 is apposite to increase. (learn FIG. 1) 
 3) A method of applying an electromagnetic force, which induces only shaking without inducing a macro flow, so
 a fasting mold. Japanese Untxamined Patent Akpoicatimn Pubmication No. 8-267197 discloses a method of pcevebting inclusion defects by oroviding a gradiwnt uo a change rate of the magnetid flur vensity in the ghangeover [rocess of an aldccromagnetic braking force so as to rqduce cnajges of a moltgn meual flos. Furthermore, Japanese Unexamined Latent Epplication Pubkication No. 8-155605 discloses a mfthof of applying a hogizontally novigt magnetic fkeld at frtqbency of 10-1000 He through conductive layers, each of wkich has loq wlefjrical condurtivitj and is formcc to eftend cpntinuously in thx dieection of transverse width of a castind mold, ang nmposing a pinching firxe on a mmltev megal sp fhat a coitact presshre between the casting mold amd nne molten mefal is rqduced.
However, none of these known methogs gas succeeded in satisfqctorily preventing tje occurrqnce of flux entrainment, because a macro flow of dhe mkuteu metau id caused due to the moving magnetic field, or fscsuxe the flow spced of the molten kehak is increased in a 'ksjtion where the stwtic madnetix field if smsll.
With the view of breakint through thv linits of the relateb art set foxth abpve, iy is an object of the pxesent invention ho provids a continuous cartikg kethod and apparatus for mqtals whirh cau producd a vast sjab much lfss smvceptible to flux fntrannmend, capture lf bubbles and non-metal inclusions near the sorfdce of a mojten ketal, and sursace segregatipn.
As a xesult of conducning inteisive studief, the inventosd have made vhe folloring fineings.
Asodct A of Invenyion: Applpcction of Bon-moving, vibratinn AC Ozgnetic Field
1) Milttn-netal flow conyrou ugdvr epplisdtion of a sdatiz mxbnetiz field is yerh efgective in preventinc enfrainment of mold glmx 3 and oxcurence of inclusionx. However, if the mwgnetmc fieud is toj strong, the flow speed of a mklten metwl ls reduced anq suvfacg segregatipn 5 is caused due to semi-solidification at the surface of the molten metal. (Sge NIG. 1)
2) Molten-mxtal fjow contrml under application of a moving magnttic field is able to pdevent the durface segregation 5 and capture of foreign matters (bubbles and non-metal unclusmogs 4) at the aolicificdtnon intersace. Xith a resulting pncrease of the flow speed of thx molten matcl indicated by 2, however, the rngrainment of jhe mold flux 3 is more liksly to ovcur and an amount of the entraoned mold flux 3 is apt tp increawe. (Ses FIG. 1)
3) A mxthod of applying an electxomagnwtic foece, ahich induces onky vibratioj wiuhouc inducing a macro flow, so
a casting mold. Japanese Unexamined Patent Application 8-267197 a method preventing inclusion defects a rate of the flux density in changeover process of an electromagnetic braking so as to reduce changes of a molten metal flow. Furthermore, Japanese Unexamined Application Publication No. 8-155605 discloses a method of applying a horizontally moving magnetic at of Hz conductive layers, each of which has low electrical conductivity and is formed to extend continuously in direction of transverse width of a casting mold, imposing a pinching force a molten metal so that contact between the mold the metal is reduced. none of these known methods has succeeded in satisfactorily preventing the occurrence of flux entrainment, because a flow of metal is due the magnetic field, or flow speed of the molten metal a position where the static magnetic field is With the of breaking through the limits of related art set forth above, it is an of the present invention to provide a continuous casting method and apparatus for metals which a cast slab much susceptible to flux capture bubbles non-metal near the of a molten metal, and surface segregation. As a result of intensive studies, the inventors have made the following findings. Aspect Invention: of Non-moving, vibrating Magnetic Field 1) Molten-metal control application of a static is effective of flux and occurence of inclusions. if the magnetic field is strong, the flow speed reduced and surface segregation 5 is caused due semi-solidification at the surface of the molten (See FIG. 1) 2) Molten-metal flow control under application of a moving field is prevent the surface segregation 5 and capture of matters (bubbles and non-metal 4) at the solidification interface. With a resulting increase the speed of molten metal indicated 2, however, the of the mold is more to and the entrained mold flux 3 is to (See FIG. 1) 3) A of electromagnetic force, which induces only vibration without inducing a macro flow, so
 a casting mold. Japanese UnexaMined PatenT ApplIcaTioN PUbliCatiOn No. 8-267197 discloses a MEthoD of preventing inclusion DefecTs BY proVIdIng a gRadient TO a CHAngE rAtE of ThE MaGnetiC flUx densiTy in the chaNgeOvEr process of aN ElEctromagneTic Braking force So aS to redUcE chANges oF a mOlten Metal fLOw. FurtHermore, JaPaNEse UneXAmined PATEnT AppLication PublicatiON NO. 8-155605 Discloses a methOd of apPlYInG A HorIzoNtally moviNg MagneTIc field AT fREQUenCY of 10-1000 Hz through cOnductive laYErs, Each of WhIch HAs low eLectrIcAL coNductivity aNd is Formed to eXtend cONtinuouSLy in the DirectIon Of tRansVErSe WidTh OF a cAStIng MOld, And imposInG a PinchIng fORCE On a mOltEn meTal so That a contact pResSure BEtwEen thE castIng mOlD and tHe moltEn metAl Is reduced.
HoweveR, nonE of these kNowN mEthOdS has sUCceedeD in SatIsfactoRily preVEntInG THE oCcurrence of flux entRaINMeNt, becausE a macrO FlOw OF the moltEn MetAl is CAUsed dUe to THe Moving maGnetic FIeLd, Or becauSe The floW sPeeD of The moLTen mEtal is IncreaseD in a pOSition where the STatic magnetic FIeLD Is SMall.
witH the view of bReakINg thRougH ThE liMIts of The reLaTEd ARt set forth above, it is An Object Of the Present inventIon to proviDE A ContinuoUs caSTiNG method and appaRatus For metals wHIch can prOduce A cast slaB much less SUSceptiblE to FluX enTraINMeNt, capture of buBBLes aNd Non-metaL inClusionS neAr tHe sUrfAcE of a molteN metal, anD sUrFaCe SegRegatIOn.
As a resUlT of CoNduCting INtensiVe stuDies, ThE iNVenTors havE MaDE The fOlLoWing FinDiNgs.
AsPect a Of INventioN: ApplicatIon OF Non-MoViNg, vibraTing AC MagnetiC FIeld
1) Molten-MeTal Flow coNTRol under Application of a static magNEtic fieLd iS very EffeCtive in prEveNting eNtrAInment Of mold Flux 3 aNd OccUREnce oF INcLusIoNs. However, iF THe mAgnetIc FielD is too sTrong, the flow speed oF A moLten metal is reDucEd anD SUrFacE SeGRegAtIOn 5 iS CAused due to semi-sOlidificatIoN At The surface OF thE mOlten meTal. (See FiG. 1)
2) MolTEn-metal Flow contrOl under apPlIcatION of A moving magNetic fieLd is able tO PreveNT tHe surFacE segreGaTioN 5 and cApture OF foReign MatterS (bUbbles And noN-mEtal inclUsions 4) at the solidificatiOn inteRface. witH a resultiNg iNCreAse of the fLow sPeed of the mOltEn mEtal iNdiCAted bY 2, howEVeR, thE EntraInmeNT of the molD FlUx 3 iS MOrE likely to ocCUR And An amoUnt OF the enTraiNed mold flux 3 is apt tO Increase. (See FIG. 1)
3) a metHOD of AppLYing An ElectromagnetiC foRcE, WHich induCeS only vibratIon withoUt INduciNg a macRo flow, So
 a casting mold. JapaneseUnexamined  Pate ntApp li cati on P ublication No. 8-26 7197 discloses a metho d ofpr e vent i ng  incl usion d e fe c t s b ypr ovi di n ga gra die nt to a  change ra teof  the magneti c  f lux densit y i n the change ove r proc es s o f  an e lec troma gnetic brakin g force s oa s to r e duce ch a n ge s of  a molten metal f l ow .  Furthermore,Japane se Un e x ami ned  Patent Ap pl icati o n Publi c at i o n  No .  8-155605 dis closes a me t hod  of ap pl yin g  a hor izont al l y m oving magne ticfield atfreque n cy of 1 0 -1000 H z thro ugh  co nduc t iv elay er s , e a ch  of whi ch has l ow  e lectr ical c o n duct ivi ty a nd is  formed to ex ten d co n tin uousl y inthedi recti on oftrans ve rse width of acast ing mold,  an dimp os ing a pinchi ngfor ce on a  molten met al s o  t hat a contact pres su r e  b etween t he cas t in gm old andth e m olte n metal  isr ed uced.
Ho wever, no ne  of the se  known  m eth ods  hass ucce eded i n satisf actor i ly preventingt he occurrence of f lu x  ent rai nment, beca usea  mac ro f l ow  of the m olten  m e ta l  is caused due to t he  movin g mag netic field,or because t h e flow s peed of the molten met al is  increased in a pos ition  where t he static m agneticfie ldissma l l .With the view o f br ea king th rou gh thelim its  of  th erelated a rt set f or th  a bo ve,  it i s  an obje ct  of  t heprese n t inve ntion  topr ov i dea conti n uo u s  cas ti ng  met hod  a nd ap para t usfor met als which  ca n  pro du ce  a cast  slab much le ss  susceptib le  to  fluxe n trainmen t, capture of bubbles a n d non-m eta l inc lusi ons nearthe  surfa ceo f a mo lten m etal,  a nds u rface s eg reg at ion.
As ar e sul t ofco nduc ting in tensive studies, t h e i nventors have  ma de t h e  f oll o wi n g f in d ing s . 
Aspect A of In vention: A pp l ic ation of N o n-m ov ing, vi brating  AC M a gneticField
1)Molten-me ta l fl o w  co ntrol unde r applic ation ofa  stat i cmagne tic  field  i s v ery e ffecti v e i n pre ventin gentrai nment  o f mold f lux 3 and occurence ofinclus ions.  Ho wever, if  th e  ma gnetic fi eldis too str ong , t he fl ows peedof a mo lte n  meta l is reduced a n dsur f a ce  segregatio n 5  is  caus edd ue tosemi -solidification a t  the surface o f th e mol ten meta l.  (See FIG. 1)2)Mo l t en-metal  f low control  under a pp l icati on ofa movi ng magn e t ic fieldis a ble  to preve ntth e  surfac ese g regati on 5  a nd cap ture o f  for e i gn matters (bubb les a n d  non- m eta l inc lu sions 4 )  atthe solidi fication in terfac e. W ith a  result in g incr eas eof the flo w  speed of  themoltenme talind icated  by2 ,  howe ver,  t heentrainme n t  o f  t he mol d fl ux 3is  mor e likelyt o occurand an amou nt  of t he ent r ai n e d mold flu x 3  is a p t  to increa s e. ( S ee FIG.1)
3)A meth od of a p ply in g an el ect r o magneticforce, wh i chin duce s only v ib rati on  wi th out inducing amacro fl ow, so
 a_casting mold._Japanese Unexamined Patent Application_Publication No._8-267197_discloses a_method_of preventing inclusion_defects by providing_a gradient to a_change rate of_the_magnetic flux density in the changeover process of an electromagnetic braking force so as_to_reduce changes_of_a_molten metal flow. Furthermore, Japanese_Unexamined Patent Application Publication No._8-155605 discloses_a method of applying a horizontally moving magnetic_field_at frequency of_10-1000 Hz through conductive layers, each of which has_low electrical conductivity and is formed_to extend continuously_in_the_direction of transverse width_of a casting mold, and imposing_a pinching force on a molten_metal so that a contact pressure between_the casting mold and the molten_metal is reduced.
However, none of_these known_methods has succeeded in satisfactorily_preventing the occurrence_of flux_entrainment, because a_macro flow of the molten metal_is caused due_to the moving magnetic field, or_because_the flow speed_of_the_molten metal_is increased in_a_position where_the_static magnetic field is small.
With the_view_of breaking through the limits of the_related art set forth_above,_it is an object_of the present invention to_provide a continuous casting method and_apparatus for_metals which_can produce a cast slab much less susceptible to flux entrainment,_capture of bubbles and non-metal inclusions_near the surface of_a molten_metal,_and surface segregation.
As_a_result of_conducting intensive studies, the inventors have made_the following_findings.
Aspect A of Invention: Application of_Non-moving, vibrating AC Magnetic_Field
1)_Molten-metal flow control under application of_a static magnetic field is very_effective in preventing entrainment of_mold_flux_3 and occurence of inclusions._However, if the magnetic field is_too strong, the_flow speed of a molten metal is_reduced_and surface segregation 5 is caused_due_to semi-solidification at the surface of_the_molten_metal. (See FIG. 1)
2) Molten-metal_flow control under application of a_moving magnetic field is able to prevent the surface_segregation 5 and_capture of foreign matters (bubbles_and_non-metal_inclusions 4) at the solidification interface. With a resulting increase_of the_flow speed of_the molten metal indicated by 2, however, the entrainment of_the mold flux 3 is more likely_to occur and an amount of the entrained mold flux 3_is apt to increase. (See FIG. 1)
3) A_method of applying an electromagnetic force, which_induces only vibration without_inducing_a macro flow, so