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 na tuntuɓar tsakanin fim ɗin biyu a kan filayen ƙarfe na ciki da kuma tashin hankali tsakanin matsakaici na ciki da kuma tashin hankali da ainihin tashin hankali (lamba) yana karuwa.

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.