Lub npe tag nrho ntawm precision bearing steel yog dov precision bearing steel. Nws muaj zog compressive siab thiab qaug zog txwv, siab hardness, siab hnav tsis kam, qee yam toughness, zoo hardenability, thiab nruj tswj ntawm sulfur thiab phosphorus. Nws yog cov hlau zoo uas tuaj yeem siv los ua cov hlau ua haujlwm txias. Loj: 7.81
1. Forging kub ntawm precision bearing steel
(1) Initial forging kub: 1150 (1120) thiab zaum kawg forging kub: 850 (800).
(2) Tshem tawm qhov tsis xws luag ua ntej forging, preheat ntau npaum li sai tau thiab tom qab ntawd sai sai.
(3) Thaum lub sijhawm ua haujlwm sov, qhov chaw xiav brittle ntawm 200 txog 400 degrees yuav tsum raug zam. Thaum lub sijhawm ua haujlwm kub, tsis txhob nkag mus rau qhov chaw kub ntxhov siab (ntau dua 1250). Sim kom tsis txhob nkag mus rau thaj tsam kub nkig (800 ~ 950). Kev tsom xam hnub no:
2. Kev kho cua sov tom qab forging
(1) Tom qab forging, ———— Kev kho cua sov ua ntej (spheroidizing annealing) — 3354 Kev kho cua sov kawg (tsis kub quenching thiab tempering)
(2) Spheroidizing annealing lub hom phiaj los txo cov hardness, yooj yim ua, thiab npaj rau quenching.
Spheroidizing annealing txheej txheem: cua sov rau 750 ~ 770, tuav rau ib lub sij hawm ntawm lub sij hawm, maj mam txias kom qis dua 600, cua txias.
(3) Tsawg kub quenching thiab tempering thiab hardness rooj ntawm ntau yam precision bearing steels
Steel qib quenching kub thiab tsawg kub tempering hardness ntawm quenching nruab nrab
GCr6 800 ~ 820 Dej los yog roj 150 ~ 170 62 ~ 64
GCr9 800 ~ 830 Dej lossis roj 150 ~ 170 62 ~ 64
GCr9SiMn 810 ~ 820 Dej los yog roj 150 ~ 160 62 ~ 64
GCr15 820~846 oil 150~160 62~64
GCr15SiMn 800 ~ 840 roj 150 ~ 170 62 ~ 64
3. Quenching thiab quenching nruab nrab
(1) Quenching (kev paub) dawb yog qhov nyuaj tshaj plaws thiab nkig, daj yog tawv thiab tawv, xiav yog mos thiab tawv.
(2) Quenching nruab nrab
Dej: Feem ntau, qhov kub yuav tsum tsis pub tshaj 40, thiab yuav tsum tsis muaj impurities xws li roj thiab xab npum.
b. Aqueous tov ntsev thiab alkali: ntxiv 5-10 feem pua ntsev los yog alkali hauv dej.
Qhov cua txias ntawm cov ntsev ntsev yog kaum npaug ntawm cov dej, qhov hardness yog siab thiab zoo ib yam, tab sis lub microstructure kev nyuaj siab yog siab, thiab nws muaj ib tug tej yam corrosive nyhuv. Qhov kub yog tsawg dua 60 degrees.
Cov lye (aqueous tov ntawm caustic soda) yog heev corrosive thiab muaj me ntsis adaptability.
c Roj: suav nrog roj cav, roj spindle, roj transformer, roj diesel, thiab lwm yam tuaj yeem txo deformation thiab tawg. Tsis haum rau carbon steel. Roj kub: 60 ~ 80, qhov siab tshaj yog tsis ntau tshaj 100 ~ 120.
4. Tempering kub
Precision bearing steel yog tempered ntawm qhov kub thiab txias. Kub: 150 ~ 250. Nyob rau hauv qhov chaw ntawm kev tswj kom muaj zog hardness thiab hnav tsis kam, sab hauv kev ntxhov siab thiab brittleness tuaj yeem txo, thiab kev tawg lossis kev puas tsuaj ntxov ntxov thaum siv tuaj yeem zam tau. Hardness HRC: 58 ~ 64.
Txais tos koj nug txhua lub sijhawm.
