Kev kho saum npoo ntawm ib qho cog ncaj qha cuam tshuam nws txoj kev sib raug zoo nrog tib neeg cov ntaub so ntswg. Peb siv ntau yam txheej txheem kho deg, xws li electrolytic polishing, sandblasting, laser ua, thiab lwm yam, txhawm rau txhim kho qhov roughness, wettability thiab lwm yam khoom ntawm cov cog. Ntawm lawv, electropolishing tuaj yeem txhim kho qhov chaw tiav, txo kev ntxhov siab, thiab txo qhov kev pheej hmoo ntawm kev kis kab mob; sandblasting tuaj yeem ua rau kom qhov roughness thiab txhawb cov pob txha loj hlob.