Kev tsim nyog rau cov nkawm khau:
1) cov khoom
Caij nplooj ntoos hlav khoom yuav tsum yog Ⅰ, Ⅱ pab pawg ntawm cov paib qia qaum rau ib ncig.
2) hardness
Nyuaj thiab tau kub hnyiab txias caij nplooj ntoos hlav, qhov hardness nyob rau hauv qhov ntau ntawm 44-52HRC xaiv. Hauv cov rooj plaub tshwj xeeb, tus nqi zog yuav muab nthuav dav rau 55HRC.
3) qhov tsos kom pom zoo
Lub caij nplooj ntoos hlav ntim yuav tsum yog xim dub, cov hlau xaim yuav tsum tau du, tsis pub kom tawg, oxide, txhuam thiab lwm yam tsis xws luag; Nuv khoov tsis muaj nti; Txias caij nplooj ntoos hlav tsis pub qhov tob ntawm cov ntaub ntawv tshaj qhov kam rau ntawm ib nrab ntawm tus neeg indentation, Pits thiab khawb.
4) Tensile springs nrog kev ua haujlwm kev txwv tsis raug mus tas li nyob hauv kev ua haujlwm.
