Kev kho cua sov: Xaiv cov thermocouples rau Carburizing, Annealing, thiab Tempering

Qhov tseeb qhov kub thiab txias yog lub hauv paus ntawm cov txheej txheem kho cua sov kom ua tiav-txawm tias qhov sib txawv me ntsis tuaj yeem cuam tshuam cov workpiece hardness, ductility, lossis kev ua haujlwm zoo. Ntau qhov kev ua haujlwm kho cua sov ntsib teeb meem tshwm sim zoo li cov khoom lag luam tsis zoo lossis kev ua tsis zoo ntawm cov thermocouple, feem ntau rov qab mus rau kev xaiv tsis raug rau cov txheej txheem tshwj xeeb xws li carburizing, annealing, thiab tempering. Kev nkag siab yuav ua li cas kom phim cov thermocouple hom rau txhua daim ntawv thov yog qhov tseem ceeb kom tsis txhob muaj kev poob qis thiab ua kom muaj kev ntseeg tau ntawm cov txheej txheem.

Thermocouples ua hauj lwm los ntawm kev tsim ib tug voltage proportional rau qhov kub thiab txias sib txawv ntawm ob dissimilar hlau nyob ntawm tej koom nyob rau hauv ib kawg. Ntau hom, categorized los ntawm lawv cov hlau sib txuas, muaj qhov sib txawv ntawm qhov kub thiab txias, kev tiv thaiv corrosion, thiab ruaj khov- cov yam ntxwv uas cuam tshuam ncaj qha rau hauv kev kho cua sov. Raws li kev paub dhau los, tsis muaj ib qho -size- haum-tag nrho cov thermocouple; kev tsim nyog nyob ntawm tus txheej txheem txheej txheem thiab cov khoom raug kho.

Carburizing suav nrog cov cua sov ua haujlwm hauv cov pa roj carbon -nplua nuj huab cua ntawm 850℃txog 950 degree, ib puag ncig hnyav uas ntsuas cov thermocouple durability. Chromel-alumel (Type K) thermocouples feem ntau yog siv rau ntawm no, vim lawv ua haujlwm kub zoo thiab tiv thaiv oxidation. Rau kev ua haujlwm ntev - lub sijhawm carburizing, Hom N (Nicrosil-Nisil) yog qhov kev xaiv zoo dua- nws muaj qhov kub thiab txias zoo sib xws tab sis zoo dua rau carbonization thiab thermal cycling, ncua kev pab cuam lub neej.

Annealing, tsim los ua kom cov ntaub ntawv mos thiab txo cov kev ntxhov siab sab hauv, ua haujlwm ntawm qhov kub nruab nrab (400℃txog 800 degree) nrog rau cov huab cua ruaj khov. Hom J (Iron-Constantan) thermocouples yog tus nqi- siv tau rau cov txheej txheem no, xa qhov tseeb ntawm qhov ntsuas kub nruab nrab. 注意事项 suav nrog kev zam kom tsis txhob raug dej noo, vim hlau hauv Hom J yog qhov ua rau xeb- qhov no tuaj yeem ua rau cov hlau tawg thiab ntsuas qhov yuam kev. Rau cov txheej txheem annealing xav tau ib puag ncig huv, Hom T (Copper-Constantan) yog lwm txoj hauv kev, txawm hais tias nws muaj qhov ntsuas kub qis tshaj plaws thiab yog qhov zoo tshaj plaws rau cov ntawv thov hauv qab 400℃.

Tempering, uas ua raws li hardening los txhim kho toughness, feem ntau tshwm sim ntawm 150℃mus rau 650 degree. Ntawm no, precision thiab stability yog qhov tseem ceeb rau kev ua tiav cov khoom siv kho tshuab zoo ib yam. Hom K tseem yog qhov kev xaiv nrov rau qhov kub siab dua, thaum Hom J ua haujlwm zoo rau qis qis. Tsis tas li ntawd, cov khoom siv thermocouple sheath yog ib qho tseem ceeb raws li hom hlau hauv tempering. Ceramic sheaths yog qhov zoo tagnrho rau kev kub siab -kub tempering, raws li lawv tiv thaiv thermal shock, thaum stainless hlau sheaths yog haum rau qis kub thiab muaj kev tiv thaiv zoo mechanical.

Ntau qhov pitfalls yuav tsum zam thaum xaiv cov thermocouples. Xaiv lub thermocouple raws li tus nqi nkaus xwb feem ntau ua rau muaj kev hloov pauv tsis tu ncua thiab teeb meem tsis zoo- nqis peev rau hom zoo rau cov txheej txheem txo cov nqi ntev -. Tsis quav ntsej txog huab cua yog lwm qhov yuam kev; corrosive los yog carbon- ib puag ncig nplua nuj xav tau cov thermocouples nrog tshwj xeeb tsis kam, tsis yog hom qauv. Tsis tas li ntawd, kev teeb tsa kom raug thiab kev ntsuas tsis tu ncua yog qhov tseem ceeb-txawm tias qhov zoo tshaj plaws thermocouple yuav xa cov txiaj ntsig tsis raug yog tias tsis raug lossis tsis raug ntsuas.

Lub hauv paus ntsiab lus tseem ceeb ntawm kev xaiv thermocouple rau kev kho cua sov yog nyob rau hauv qhov sib piv ntawm qhov kub thiab txias, kev tiv thaiv ib puag ncig, thiab kev ruaj ntseg rau cov txheej txheem tshwj xeeb. Carburizing hu rau carbonization- hom resistant xws li Hom N, annealing cov txiaj ntsig los ntawm tus nqi- siv hom J (nrog rau kev tiv thaiv ya raws), thiab tempering cia siab rau qhov tseeb, sheath- haum rau kev xaiv. Rau kev kho cua sov ua haujlwm uas muaj ntau yam txheej txheem lossis kev cai ua haujlwm, kev xaiv thermocouple thiab kev sib koom ua ke yog qhov tseem ceeb rau kev ua haujlwm zoo. Cov kws tshaj lij kev soj ntsuam ntawm cov txheej txheem tsis sib xws, ua ke nrog siab - cov kev daws teeb meem thermocouple zoo, ua kom cov txiaj ntsig zoo ib yam thiab ua haujlwm tau zoo thoob plaws txhua daim ntawv thov kev kho cua sov.