Tashin hankaliƙirƙirashi ne gogayya tsakanin biyu karafa na daban-daban abun da ke ciki da kuma kaddarorin (alloys), tsakanin taushi karfe (workpiece) da wuya karfe (mutu).A cikin yanayin rashin lubrication, shine haɗin haɗin gwiwa na nau'in fim ɗin oxide na ƙarfe iri biyu;A karkashin yanayin lubrication, da lamba gogayya tsakanin oxide fim a kan biyu karfe saman da lubricating matsakaici bi da bi, da gogayya tsakanin surface na ciki Layer na workpiece, wanda ba tukuna aka oxidized kuma yana da babban adsorption karfi. da rikici tsakanin matsakaicin mai mai da kuma saman mutu da ainihin yanki (lamba) yana ƙaruwa.

Saboda da gogayya halaye tsakanin blank da mutu lamba surface a cikintsarin ƙirƙira, sakamako mai zuwa zai haifar:
(1) Ƙarfin lalacewa yana ƙaruwa da 10% saboda gogayya, kuma amfani da makamashi yana ƙaruwa daidai da haka;
(2) gogayya take kaiwa zuwa m nakasawa na forgings, sabõda haka, ciki hatsi tsarin da kuma yi ba uniform, da kuma surface ingancin ragewa;
(3) juzu'i yana haifar da raguwar siffa ta geometric da daidaiton ƙira na ƙirƙira, wanda ke haifar da jujjuyawar ƙirƙira lokacin da ƙirƙira ta cika da gaske;
(4) juzu'i yana haifar da ƙarar gaɓar mutuwa kuma yana rage rayuwarsa;
(5) Ƙara juriya na juriya na gida na cikin rami na iya sa rami wanda ke da wuyar cika karfe da kyau kuma ya rage yawan ƙi.
Ana iya ganin cewa rikici takobi ne mai kaifi biyu a cikinƙirƙira samarwa, wanda yana da fa'ida da rashin amfani.Don haka, dole ne a sarrafa juzu'i a cikin aikin ƙirƙira don tabbatar da tsarin ƙirƙira na yau da kullun.