Kodi chithandizo cha kutentha kwa induction ndi chiyani?

1. Mfundo zoyambirira

Kuchetsa kuumitsa ndikugwiritsa ntchito mfundo ya electromagnetic induction kuyika chogwirira ntchito mu koyilo yolowera yopangidwa ndi chubu chamkuwa. Pamene kusinthasintha kwamakono kukugwiritsidwa ntchito pa koyilo yolowetsamo, mphamvu ya maginito yosinthira yomwe imakhala ndi mafupipafupi amkati mkati mwake idzapangidwira mkati ndi kuzungulira. Ngati workpiece imayikidwa M’maginito, mphamvu yowonongeka imapangidwa mkati mwa workpiece (conductor), ndipo workpiece imatenthedwa chifukwa cha kukana. Chifukwa cha “chikopa cha khungu” chamakono osinthasintha, kachulukidwe kameneka pafupi ndi pamwamba pa workpiece ndi yaikulu kwambiri, pamene panopa pakatikati pa workpiece ndi pafupifupi zero. Kutentha kwapamtunda kwa workpiece kumatha kufika madigiri 800-1000 Celsius mkati mwa masekondi angapo, pomwe pachimake chikadali pafupi ndi kutentha. Pamene kutentha pamwamba limatuluka kutentha quenching, utsi kuzirala yomweyo kuzimitsa pamwamba workpiece.

2. Mawonekedwe a kutentha kwa induction

A. Chifukwa kutentha kwa induction kumakhala kofulumira kwambiri komanso kuchuluka kwa kutentha kwakukulu ndi kwakukulu, nsonga yofunika kwambiri yachitsulo imawonjezeka, kotero kutentha kozimitsa (kutentha kwa workpiece pamwamba) ndipamwamba kuposa kutentha kwazimayi.

B. Chifukwa cha kutentha kwachangu, makristasi a austenite sali ophweka kukula. Pambuyo pa kuzimitsidwa, mawonekedwe abwino kwambiri a cryptocrystalline martensite amapezedwa, omwe amapangitsa kuuma kwa pamwamba kwa workpiece 2-3HRC kukhala pamwamba kuposa kuzimitsa wamba, ndipo kukana kuvala kumapangidwanso bwino.

C. Pambuyo pa kuzimitsa pamwamba, kuchuluka kwa martensite muzitsulo zowuma ndi zazikulu kuposa mawonekedwe oyambirira, kotero pali kupsyinjika kwakukulu kotsalira pamtunda, zomwe zingathe kusintha kwambiri kukana kupindika ndi kutopa kwa zigawozo. Zigawo zazing’ono zimatha kuonjezedwa ndi nthawi 2-3, zigawo zazikuluzikulu zitha kuwonjezeka ndi 20% -30%.

D. Chifukwa kuthamanga kwa kutentha kwa induction kumakhala kofulumira ndipo nthawi ndi yochepa, palibe oxidation kapena decarburization pambuyo pozimitsa, ndipo kusinthika kwa workpiece kumakhalanso kochepa kwambiri. Pambuyo poumitsa kulowetsedwa, kuti muchepetse kupsinjika kozimitsa ndikuchepetsa brittleness, kutentha kwapansi pa 170-200 digiri Celsius kumafunika. Zopangira zazikuluzikulu zimathanso kudziletsa pogwiritsa ntchito kutentha kotsalira kwa cholumikizira chozimitsidwa.