Ukusebenza kwama-mandrels avinjelwe

I-mandrel iyithuluzi elibalulekile ekukhiqizeni amapayipi angenamthungo. Ifakwa ngaphakathi emzimbeni wepayipi, isebenze kanye nama-roller ukwenza i-annular pass, ngaleyo ndlela isiza ekubumbeni ipayipi. Ama-mandrels asetshenziswa kakhulu ezinqubweni ezifana nezigayo eziqhubekayo, ukunwetshwa kwe-cross-roll, izigayo zokugingqa amapayipi ngezikhathi ezithile, ukubhoboza, nokugoqeka okubandayo nokudwetshwa kwamapayipi.

Ngokuyinhloko, i-mandrel iyibha ende ye-cylindrical, efana nepulaki yokubhoboza, ebambe iqhaza ekuguqulweni kwepayipi ngaphakathi kwendawo yokuguqulwa. Izici zayo zokunyakaza ziyahlukahluka ngezindlela ezihlukene zokugoqa: ngesikhathi sokugoqa, i-mandrel ijikeleza futhi ihamba nge-axially ngaphakathi kwepayipi; ezinqubweni zokugingqa longitudinal (njengokugingqa okuqhubekayo, ukugingqika ngezikhathi ezithile, nokubhoboza), i-mandrel ayijikelezi kodwa ihamba nge-axially kanye nepayipi.

Ezingxenyeni eziqhubekayo zokugaya, ama-mandrels ngokuvamile asebenza ngamaqembu, iqembu ngalinye liqukethe okungenani ama-mandrel ayisithupha. Izindlela zokusebenza zingahlukaniswa zibe izinhlobo ezintathu: ezintantayo, eziboshiwe, nezintanta kancane (okubuye kwaziwe ngokuthi kukhawulelwe kancane). Lesi sihloko sigxile ekusebenzeni kwama-mandrels avinjelwe.

Kunezindlela ezimbili zokusebenza zama-mandrels avinjelwe:

1. Indlela Yendabuko: Ekupheleni kokugoqa, i-mandrel iyayeka ukunyakaza. Ngemuva kokuthi igobolondo lisusiwe ku-mandrel, i-mandrel ibuya ngokushesha, iphuma emgqeni wokugoqa, futhi ipholile futhi igcotshwe ngaphambi kokuba isetshenziswe kabusha. Le ndlela ngokwesiko isetshenziswa eMannesmann Piercing Mills (MPM).
2. Indlela Ethuthukisiwe: Ngokufanayo, ekupheleni kokugoqa, i-mandrel iyayeka ukuhamba. Nokho, ngemva kokuba igobolondo ekhishwe mandrel by stripper, esikhundleni ukubuya, mandrel uya phambili ngokushesha, kulandela igobolondo ngokusebenzisa stripper. Kuphela ngemva kokudlula ku-stripper lapho i-mandrel iphuma khona emugqeni wokupholisa, ukuthambisa, nokusebenzisa kabusha. Le ndlela inciphisa isikhathi sokungenzi lutho se-mandrel emgqeni, ifinyeza ngokuphumelelayo umjikelezo wokugoqa futhi ikhulise ijubane lokugijima, ifinyelele isivinini esingafika ku-2.5 amapayipi ngomzuzu.

Umehluko omkhulu phakathi kwalezi zindlela ezimbili usendleleni ukunyakaza mandrel ngemva kokususwa igobolondo: ngendlela yokuqala, mandrel iqhubekela kolunye uhlangothi igobolondo, ihoxisa kusukela isigayo rolling ngaphambi kokuphuma umugqa rolling. Ngendlela yesibili, i-mandrel ihamba ngendlela efanayo negobolondo, iphuma endaweni yokugaya, idlule ku-stripper, bese iphuma emgqeni wokugoqa.

Kubalulekile ukuqaphela ukuthi endleleni yesibili, njengoba i-mandrel idinga ukudlula ku-stripper, ama-stripper rolls kufanele abe nomsebenzi ovala ngokushesha ovulekile lapho egingqa amapayipi ensimbi anezindonga ezincane (lapho isilinganiso sokunciphisa i-stripper okungenani kabili ukushuba kodonga lwegobolondo) ukuvimbela i-mandrel ekulimazeni imiqulu ye-stripper.