Ukusebenza kwe-mandrels ecinezelweyo

I-mandrel sisixhobo esibalulekileyo kwimveliso yemibhobho engenamthungo. Ifakwe ngaphakathi komzimba wombhobho, isebenzisana kunye ne-roller ukwenza i-annular pass, ngaloo ndlela incedisa ekubunjweni kombhobho. IiMandrels zisetyenziswa ngokubanzi kwiinkqubo ezinje ngokuqengqeleka kokuqengqeleka, ukuqengqeleka okunqamlezayo, ukuqengqeleka kombhobho ngamaxesha athile, ukugqobhoza, ukuqengqeleka okubandayo nokuzoba imibhobho.

Ngokusisiseko, i-mandrel yibha cylindrical ende, efana neplagi yokugqobhoza, ithatha inxaxheba kwi-deformation yombhobho ngaphakathi kwendawo yokuguqulwa. Iimpawu zayo zokuhamba ziyahlukahluka ngeendlela ezahlukeneyo zokuqengqeleka: ngexesha lokuwela, i-mandrel ijikeleza kwaye ihamba nge-axially ngaphakathi kombhobho; kwiinkqubo zokuqengqeleka longitudinal (ezifana nokuqengqeleka okuqhubekayo, ukuqengqeleka ngamaxesha, kunye nokugqobhoza), mandrel ayijikelezi kodwa ihamba axially kunye nombhobho.

Kwiiyunithi eziqhubekayo zokusila, i-mandrels idla ngokusebenza ngokwamaqela, kunye neqela ngalinye eliqulethe ubuncinane ama-mandrel amathandathu. Iindlela zokusebenza zingahlelwa zibe ziindidi ezintathu: ukudada, ukunyanzelwa, kunye nesiqingatha-ezidadayo (ekwaziwa njenge-semi-constrained). Eli nqaku lijolise ekusebenzeni kwe-mandrels ethintelweyo.

Kukho iindlela ezimbini zokusebenza zokuthintela mandrels:

1. Indlela yesiNtu: Ekupheleni kokuqengqeleka, i-mandrel iyayeka ukuhamba. Emva kokuba iqokobhe isusiwe mandrel, mandrel ngokukhawuleza ubuya, uphuma kumgca wokuqengqeleka, kwaye lupholile kwaye lubricated phambi kokuba isetyenziswe kwakhona. Le ndlela ngokwesiko isetyenziswa kwiMannesmann Piercing Mills (MPM).
2. Indlela ephuculweyo: Ngokufanayo, ekupheleni kokuqengqeleka, i-mandrel iyayeka ukuhamba. Noko ke, emva kokuba iqokobhe itsalwa mandrel yi stripper, endaweni ukubuya, mandrel ihambela phambili ngokukhawuleza, ilandela iqokobhe ngokusebenzisa stripper. Kuphela emva kokudlula kwi-stripper apho i-mandrel iphuma kumgca wokupholisa, ukuthambisa, kunye nokusebenzisa kwakhona. Le ndlela kunciphisa ixesha mandrel angenzi nto emgceni, ngempumelelo ukunciphisa umjikelo kunye nokwandisa isantya rolling, ukufikelela isantya ukuya ku-2.5 imibhobho ngomzuzu.

Umahluko ophambili phakathi kwezi ndlela zimbini ilele kwindlela intshukumo mandrel emva kokuba iqokobhe isusiwe: kwindlela yokuqala, i mandrel ihambela kwelinye icala iqokobhe, irhona ukusuka yokusila phambi kokuphuma kumgca rolling. Kwindlela yesibini, i-mandrel ihamba kwicala elifanayo neqokobhe, iphuma kwi-rolling Mill, idlula kwi-stripper, kwaye iphuma kumgca wokuqengqeleka.

Kubalulekile ukuqaphela ukuba kwindlela yesibini, ekubeni i-mandrel idinga ukudlula kwi-stripper, i-stripper rolls kufuneka ibe nomsebenzi okhawulezayo ovulekileyo xa uqengqeleka imibhobho yentsimbi ebhityileyo (apho umlinganiselo wokunciphisa umhluli ubuncinci. kabini ubukhulu bodonga lweqokobhe) ukukhusela i-mandrel ekonakalisa imiqulu ye-stripper.