Tus naj npawb ntawm cov ntxig rau ntawm qhov tuag- nrum qhov yuav tsum tsis txhob ntau dhau; Thib ob, kev sib txuas ntawm cov khoom ntxig thiab cov tuag- ntu ntu yuav tsum ruaj khov, thiab cov grooves, protrusions, knurling, thiab lwm yam, yuav tsum muaj ntawm cov khoom siv; Thib peb, cov khoom ntxig yuav tsum zam cov kaum ntse ntse kom yooj yim rau kev tso kawm thiab tiv thaiv kev ntxhov siab hauv cov casting. Yog hais tias muaj qhov hnyav electrochemical corrosion ntawm lub casting thiab qhov ntxig, qhov saum npoo ntawm qhov ntxig yuav tsum tau plated rau kev tiv thaiv; Thaum kawg, castings nrog inserts yuav tsum zam kev kho cua sov kom tsis txhob ntim cov kev hloov pauv los ntawm theem hloov ntawm ob lub hlau, uas tuaj yeem xoob cov ntxig.
Txhua qhov chaw ntawm qhov tuag- nrum ib feem yuav tsum muaj lub kaum sab xis (tshwj tsis yog ntawm txoj kab sib faib) kom ntseeg tau tias cov hlau ntws zoo thaum lub sij hawm txhaws, ua kom cov pa khiav tawm, thiab tiv thaiv cov kab nrib pleb los ntawm cov kaum ntse ntse. Rau kev tuag- nrum qhov chaw uas yuav tsum tau electroplating thiab txheej, cov ces kaum sib npaug tuaj yeem plated sib npaug los tiv thaiv cov xim pleev xim ntawm cov ces kaum ntse. Lub vojvoog R ntawm lub kaum sab xis ntawm qhov tuag- feem ntau yuav tsum tsis txhob tsawg dua 1 hli, thiab qhov tsawg kawg nkaus yog 0.5 hli.
