Yuav ua li cas saib riam, ok?
Cov riam zoo hauv chav ua noj yuav tsum muaj cov xwm txheej yooj yim?
Kev tsim me me los txheeb xyuas cov ntsiab lus tseem ceeb ntawm ob peb yam yooj yim (
1)
Kov, kov tsim siv yooj yim, tsis plam, hniav kom muaj zog muaj zog.
(
2)
Riam ntawm cov khoom zoo, hardness, hardness nyob rau hauv ntau tshaj 54 degrees ntawm hardness.
(
3)
Tus kov thiab hniav yuav tsum nyob rau ntawm txoj kab ncaj nraim, thiab ua kom lub symmetry.
Cov hniav ntse, raws li qhov sib txawv ntawm kev siv, lub geometry ntawm lub kaum sab xis yuav tsum sib txawv, me me ntawm ib rab riam lub kaum sab xis, tab sis yuav tsum muaj qhov pom tseeb.
(
4)
Tsis tuaj yeem muab pov rau ntawm cov hniav sib tsoo coarse hlau thiab dub hlau, pitting cheeb tsam tsis ntau tshaj 0.
5 ib square millimeter, pitting yuav tsum tsis pub tshaj 3, lub ntsej muag tsis muaj tes, du.
Xaiv qhov kev nkag siab zoo: (cov cuab yeej txiav
1)
Saib ntawm ob sab ntawm lub cuab yeej txiav, seb qib tawm yog ci thiab huv, thiab tsis muaj forging dent.
(
2)
Raws li seb cov hniav thickness, steel nruab nrab, hniav lub qhov ncauj ncaj es tsis txhob nkhaus, saib ncaj hniav ib tug dub kab, tsis muaj 'ua tau'.
(
3)
Tus tswv. sab nraub qaum, txiav, riam nrog sib tsoo du, tsis dub, tsis muaj burr, tsis txhob tuav tes.
(
4)Tus kov rau nruab ncaj, muaj zog, tsis xoob riam hlua.
