Ntau qhov teeb meem uas xav tau kev saib xyuas hauv high-frequency quenching ntawm bearing steel?

1. Annealing hardness: hardness thiab qauv ntawm cov annealed qhov chaw yuav tsum tau soj ntsuam ua ntej kev kho cua sov. GCr15: 179-207HB (88-94HRB), lwm tus yog 179-217HB (88-97HRB). Yog tias qhov hardness tsis tsim nyog (siab dhau, qis dhau lossis tsis sib npaug), cov laj thawj yuav tsum tau ua tib zoo txheeb xyuas, uas tuaj yeem cuam tshuam rau qhov quenching (xws li hardness tsis txaus, decarburization, overheating, loj oval, thiab lwm yam).

2. Quenching thiab tempering hardness: thaum phab ntsa thickness tsis ntau tshaj 12 hli, tom qab quenching, ≥63HRC, tom qab tempering, 60-65HRC; tej zaum yuav ua tau raws li tus neeg yuav tsum tau muaj hardness tshwj xeeb, xws li 61-64HRC, thiab lwm yam, tab sis lub hardness kam rau ua ntau yam tom qab tempering Qhov loj yuav tsum tsawg tshaj li 3HRC; Thaum lub sij hawm ib txwm quenching, tus nqi hardness mas nyob ntawm tempering kub.

3. Hardness uniformity: Tus qauv qhia tias hardness uniformity ntawm tib seem feem ntau yog 1HRC; thaum sab nraud txoj kab uas hla loj dua 200mm, nws yog 2HRC thaum nws tsis loj dua 400mm; thaum nws loj dua 400mm, nws yog 3HRC.

Kev ua tau zoo ntawm unqualified hardness:

(1) High hardness: siab quenching kub los yog lub sij hawm cua sov ntev, txias ceev heev, muaj peev xwm carbon siab (carburization).

(2) Tsawg hardness: qis quenching kub los yog luv luv lub sij hawm cua sov, qeeb txias tus nqi, tsawg carbon peev xwm (nrog decarburization), thiab cov khoom decarburization.

(3) Tsis sib xws hardness: qis quenching kub los yog luv luv lub sij hawm cua sov, qeeb txias tus nqi, khoom decarburization, thiab stick ntxoov ntxoo.