Cov txheej txheem tseem ceeb rau kev ntsuam xyuas qhov sib xws ntawm hardness nyob rau hauv H13 cov khoom yog siv lub portable hardness tester los ntsuas ntau lub ntsiab lus ntawm lub workpiece, xam tus kheej workpiece ntau yam thiab batch standard deviation, thiab muab qhov no nrog metallographic tsom xam xyuas cov uniformity ntawm lub microstructure. Txoj kev no tuaj yeem txheeb xyuas qhov chaw tsis sib xws xws li cov chaw mos thiab cov cheeb tsam nyuaj.
1. Ntawm -site Hardness Testing Procedure
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Cov kauj ruam |
Ntsiab Lus |
Kev piav qhia |
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① Ntsuas Point Xaiv |
Xaiv 3-5 qhov chaw tseem ceeb rau ib daim: nto, ntug, nruab nrab, thiab thickness hloov chaw. |
Npog cov cheeb tsam uas muaj cua txias tsis sib xws los txhim kho kev sawv cev. |
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② Kev Kho Hniav |
Xuab zeb nrog cov ntawv xuab zeb mus rau ib qho hlau nplaum, tshem tawm cov oxide txheej thiab cov roj stains. |
Xyuas kom zoo sojntsuam tiv tauj kom tsis txhob nyeem ntawv tsawg. |
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③ Instrument Calibration |
Calibrate ntawm tus qauv thaiv ua ntej kuaj kom paub tseeb tias qhov yuam kev tsawg dua lossis sib npaug rau ± 1 HRC. |
Tiv thaiv kev tsis ncaj ncees. |
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④ Ntau-point ntsuas |
Ntsuas 3 zaug ntawm txhua qhov taw tes thiab coj tus nqi nruab nrab. |
Qhov kev ncua deb ntawm cov indentations nyob ib sab yuav tsum siab dua los yog sib npaug li 3 hli. Txo qhov yuam kev random thiab txhim kho repeatability. |
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⑤ Kev Ntsuam Xyuas Cov Ntaub Ntawv |
Xam qhov ntau (tus nqi siab tshaj - tus nqi qis) thiab tus qauv sib txawv |
txiav txim siab hardness sib xws. |
Daim Ntawv Pov Thawj: Ib daim ntau yam tsawg dua lossis sib npaug rau 2 HRC, batch nruab nrab ntawm 48-52 HRC.
2. Cov Cai Txiav Txim Siab Zoo
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Qhov taw qhia |
Kev ua tau zoo sib xws |
Inconsistency Risk |
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Ib Cheeb Tsam Ib Leeg |
Tsawg dua lossis sib npaug li 2 HRC |
>3 HRC qhia tias tsis sib xws los yog tsis txaus tempering |
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Batch nruab nrab |
48-52 HRC |
Deviation >1 HRC yuav tsum tau ceeb toom |
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Batch Standard Deviation |
Tsawg dua lossis sib npaug li 0.8 HRC |
Qhov loj dua tus nqi, cov txheej txheem tsis ruaj khov |
Piv txwv: Lub hardness ntawm 5 ntsuas cov ntsiab lus ntawm H13 manifold yog 50.1, 50.3, 49.8, 46.5, thiab 50.2 HRC, nrog ntau yam ntawm 3.7 HRC. Qhov no raug txiav txim raws li qhov chaw mos hauv zos, ua rau muaj kev pheej hmoo ntawm kev tawg thaum lub sijhawm ua haujlwm.
3. Cov txheej txheem pov thawj pab txhawb
Kev Ntsuam Xyuas Metallographic Sampling: Cov qauv ntawm cov khoom ua haujlwm nrog qhov txawv txav yog npaj rau kev soj ntsuam kom paub meej tias muaj qhov tsis muaj martensite, khaws cia austenite, lossis coarsening ntawm microstructure.
Kev Ntsuas Kub Kub Kub Kub: Xyuas seb qhov ntsuas kub puas ruaj khov ntawm 550 ~ 600℃thaum lub sijhawm tempering, thiab seb puas muaj kev cuam tshuam lossis qhov sib txawv hauv cheeb tsam.
Composition Pre-kev tshuaj xyuas thiab sib piv: XRF yog siv los lees paub qhov sib xws ntawm Cr, Mo, thiab V cov ntsiab lus hauv cov khoom siv raw, tshem tawm qhov cuam tshuam ntawm cov khoom hloov pauv.
Txoj Cai Kev Nyab Xeeb: "Cov ntaub ntawv hais rau nws tus kheej, ntau- kev txheeb xyuas qhov ntev" ua kom ntseeg tau tias qhov sib xws ntawm hardness yog traceable thiab tswj tau.
