Gogewa a cikiKagajiis the friction between two metals of different composition and properties (alloys), between soft metal (workpiece) and hard metal (die). A cikin batun babu lubrication, shine lambar saduwa da nau'ikan nau'ikan oxide na ƙarfe; A karkashin yanayin lubrication, tashin hankali tuntuɓar tsakanin fim ɗin biyu a kan filayen ƙarfe na ƙarfe da kuma ɓataccen ƙarfi kuma yana da ƙarfi da yawa kuma yana da ƙarfi mai yawa, Kuma gogayya tsakanin m matsakaiciyar matsakaici da kuma farfajiya na mutu da ainihin tashin hankali (lamba) karuwa ne.

Saboda halaye na gargajiya tsakanin blank da mutu saduwa da farfajiya a cikinTsarin tsari, sakamakon zai haifar:
(1) karfi da ƙarfi yana ƙaruwa da kashi 10% saboda tashin hankali, da kuma yawan amfani da makamashi yana ƙaruwa daidai sosai;
(2) gogayya ta haifar da rashin daidaituwa mara kyau, saboda haka tsarin hatsi na ciki da aikin ba suɗawa, kuma yanayin yana raguwa;
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(4) gogayya tana haifar da matsanancin mutuƙar mutu kuma ta yalwata rayuwarta;
(5) Kara yawan 'yan bangarorin yankin juriya na kogon na iya yin kogon wanda yake da wuya a cika rabin karfe da rage karara.
Ana iya ganin hakan cewa hargitsi takobi ne mai ninka a cikinm, wanda yake da fa'idodi da rashin amfanin gona. Saboda haka, tashin hankali a cikin m tsari dole ne a kula da tabbatar da tabbatar da yanayin da yaji na yau da kullun.