Lub hardness ntawm cov hlau txhaj ncaj qha cuam tshuam rau kev ua haujlwm tu, qhov roughness ntawm lub workpiece deformation, micro-kev pheej hmoo tawg thiab txhaj tshuaj peening ntxiv zog. Nws yuav tsum raug xaiv kom raug raws li cov khoom siv ua haujlwm, tuab, qhov xav tau ntawm qhov chaw thiab lub hom phiaj ua haujlwm.
1. Qib Hardness & Basic Yam ntxwv (HRC)
1.Low Hardness: 30–40 HRC (HV 300–400) Lub zog cuam tshuam nruab nrab, tsis muaj kev puas tsuaj yooj yim rau workpieces, lub neej ua haujlwm ntev; txo kev tu kom zoo thiab kuj roughness ntau dua.
2.Nruab nrab Hardness: 40–50 HRC (HV 400–500) Kev ua haujlwm sib npaug nrog kev ua haujlwm siab; zoo tagnrho rau ob qho tib si tu thiab deg ntxiv dag zog nrog tswj roughness.
3.High Hardness: 50–60 HRC (HV 500–600) Muaj zog cuam tshuam, ceev ceev thiab tsis tshua muaj roughness; tej zaum yuav ua rau deformation lossis micro- tawg ntawm cov ntaub ntawv mos nrog kev noj ntau dua.
4.Ultra-siab Hardness: Ntau dua los yog sib npaug rau 60 HRCFor aviation thiab siab -lub zog txhawb kev siv; zoo zog txhawb zog tab sis siab brittleness, tsuas yog rau siab - hardness workpieces.
2. Hardness Requirements los ntawm Workpiece Materials
1.Soft Hlau (Aluminium, Aluminium Alloy, Copper, Magnesium Alloy) Yuav tsum muaj hardness:25-35 HRCTsis txhob indentation, deformation thiab hlau paug; tsuas yog tshem tawm oxide zaj duab xis thiab roj stains.
2.Mild Carbon Steel & Ordinary SteelRequired hardness:35-45 HRC; 35–40 HRC rau nyias daim hlauBalance xeb tshem tawm efficiency thiab tiv thaiv- deformation kev ua tau zoo.
3.High - carbon hlau, Alloy Steel & Castings Yuav tsum tau hardness:45–55 HRC; 50-58 HRC rau kev ntxiv dag zog tshem tawm cov xeb hnyav thiab burrs, thiab txhim kho kev qaug zog.
4.High -lub zog hlau, Stainless SteelRequired hardness:50-60 HRCTshem tawm cov nplai tuab thiab hnyav xeb kom tiv thaiv- txheej txheej corrosion.
3. Hardness Requirements los ntawm kev ua lub hom phiaj
1.Rust & Scale Tshem Tawm: 45–55 HRC
2.Shot Peening & Surface Strengthening: 40–58 HRC
3.Fine Cleaning & Matt Surface Finishing: 35–45 HRC
4.Thin & Precision Workpieces: 25-35 HRC
4. Cov Lus Cim Tseem Ceeb
1.Lub hardness ntawm steel txhaj yuav tsum5-10 HRC qis duatshaj lub workpiece hardness los tiv thaiv nto puas.
2.Hardness kam rau ua yuav tsum tau tswj nyob rau hauv ± 3 HRC los xyuas kom meej kev kho deg zoo.
3.Match particle loj nrog hardness rau kev kho kom zoo.
4. Kev txhaj tshuaj hnyav hnyav heev yuav ua rau micro- tawg ntawm cov khoom muag muag.
