A matsayin ɗaya daga cikin mahimman sassa na injin, crankshaft yana ɗaukar aikin haɗin gwiwa na sauyawar lankwasawa da sauran nau'ikan torsional yayin motsi. Musamman ma, fillet ɗin canzawa tsakanin jarida da crank yana ɗaukar mafi girman matsananciyar damuwa, kuma matsayi na crankshaft sau da yawa yakan haifar da crankshaft ya karya saboda babban damuwa. Sabili da haka, a cikin ƙirar ƙira da ƙirar ƙira, ya zama dole don ƙarfafa matsayin fillet ɗin crankshaft don haɓaka aikin gabaɗaya na crankshaft. Ƙarfafa fillet ɗin Crankshaft yawanci yana ɗaukar hardening shigar, jiyya na nitriding, fillet ɗin peening, jujjuya fillet da girgiza laser.

Ana amfani da fashewar harbe-harbe don cire sikelin oxide, tsatsa, yashi da tsohon fim ɗin fenti akan matsakaici da manyan samfuran ƙarfe da simintin gyare-gyare waɗanda ke da kauri wanda bai wuce 2mm ba ko kuma baya buƙatar ingantattun ƙima da kwane-kwane. Yana da hanyar tsaftacewa kafin shafi saman. Harsashin leƙen asiri kuma ana kiransa peening harbi, wanda shine ɗayan ingantattun hanyoyin rage gajiyar sassa da ƙara tsawon rayuwa.

An raba leƙen harbe-harbe zuwa harbin harbi da fashewar yashi. Yin amfani da fashewar fashewar harbi don maganin saman, tasirin tasirin yana da girma, kuma tasirin tsaftacewa a bayyane yake. Duk da haka, jiyya na bakin ciki farantin workpieces ta harbi peening iya sauƙaƙa nakasu da workpiece, da kuma karfe harbi hits surface na workpiece (ko harbi ayukan iska mai ƙarfi ko harbi peening) nakasa da karfe substrate. Saboda Fe3O4 da Fe2O3 ba su da filastik, suna kwasfa bayan an karya su, kuma fim din mai shine Kayan tushe yana lalacewa a lokaci guda, don haka fashewar harbi da fashewar harbe-harbe ba za su iya cire tsattsauran mai a kan kayan aiki tare da man fetur ba. Daga cikin hanyoyin da ake amfani da su na jiyya don kayan aiki, mafi kyawun tsaftacewa shine fashewar yashi.