Muaj ntau yam ntawm txoj saw hlau, suav nrog lub ntsej muag txuas thiab ob txoj hlua sib txuas. Lub zog tsis ua haujlwm ntawm cov phaj phaj yog teeb meem uas peb yuav tsum to taub, tab sis rau ob-kab saw ceev, siv kom raug yog qhov tseem ceeb dua. Cov txuj ci yog qhov pab tau ntev rau kev pab lub neej ntawm cov saw hlau.
Raws li cov cuab yeej siv tshuab feem ntau yuav tsum tau khiav lag luam 24 teev hauv ib hnub, cov phaj phaj, raws li ib feem tseem ceeb ntawm cov saw hlau, yuav tsum muaj cov kev cai siab, vim tias yog nws nce mus txog qee qhov qaug zog tus nqi, cov saw yuav sai thiab tsis ua tiav Cov.
Yog tias cov phaj saw hauv cov txheej txheem ntawm kev ua haujlwm load dhau lawm, uas ua rau lub zog tsis sib xws, nws yooj yim kom tawg lossis yuav tsum tau zawm. Txawm li cas los xij, vim tias qhov nro ntawm sab nrau ntawm cov saw yog txawv ntawm qhov ntawm sab nraub, lub xeev ua haujlwm ntawm cov saw yog ib qho kev sib hloov ceev. Tom qab qee tus lej ntawm cov kev ntxhov siab, cov saw yuav raug puas vim tsis muaj zog lub dag lub zog.
Tus phaj saw tsis ua haujlwm, qhov teeb meem ntawm carburization saum npoo tsuas yog daws tau los ntawm txoj kev txhim kho kom muaj zog tiv thaiv kev ntxhov siab. Lub duav ntawm cov phaj saw yog dav dua kom txo cov kev ntxhov siab ntawm lub qhov. Rau seem muab txhaj koob tshuaj tivthaiv peening thiab lwm yam.
Kev sib tsoo ob txoj kab hluav taws xob feem ntau tsuas yog siv rau ob-kab saw kev sib txuas. Los ntawm nws txoj kev ua kom nrawm, cov cuab yeej pab txhawb nqa cov khoom thauj tuaj yeem ua kom sai thiab mus txog qhov chaw uas tau xaiv. Hauv kev siv cov khoom siv li qub, vim yog kev coj tus kheej los yog kev sib tsoo thiab kua muag, txoj hlua khi ob txoj kev sib txawv yuav tshwm sim ntau yam kev tshwm sim tsis zoo, lub sijhawm no yuav tsum tso tseg kev siv tam sim, kev kho kom raws sijhawm, kom tsis txhob muaj xwm txheej loj.
