1. Nkag siab txog Kev Kho Nitriding:
Nitriding yog txheej txheem thermochemical txheej txheem uas cuam tshuam nrog kev sib kis ntawm nitrogen rau hauv txheej txheej ntawm cov khoom. Cov txheej txheem no feem ntau yog ua nyob rau hauv qhov chaw tswj hwm, xws li ammonia roj, ntawm qhov kub siab ntawm 500 txog 1100 degrees Celsius. Cov nitrogen atoms nkag mus rau hauv cov khoom ntawm qhov chaw, tsim nitrides uas hloov nws cov khoom.
2. Hom Nitriding:
Muaj ntau yam txheej txheem nitriding feem ntau siv hauv CNC machining, suav nrog roj nitriding, ntsev da dej nitriding, thiab ntshav nitriding. Gas nitriding yog txoj kev siv dav tshaj plaws, qhov twg cov khoom raug cuam tshuam rau cov huab cua nplua nuj ammonia. ntsev da dej nitriding yuav immersing cov khoom nyob rau hauv ib tug molten ntsev da dej uas muaj nitrogen-nplua nuj compounds. Plasma nitriding, ntawm qhov tod tes, siv cov plasma tsis tshua muaj siab ib puag ncig los qhia nitrogen rau hauv cov khoom nto.
3. Qhov cuam tshuam ntawm Nitriding ntawm cov yam ntxwv ntawm cov khoom:
Nitriding kev kho mob muaj kev cuam tshuam loj heev rau ntau yam khoom siv, txhim kho lawv cov kev ua tau zoo hauv cov ntawv thov tshwj xeeb. Cia peb tshawb txog qee cov yam ntxwv tseem ceeb cuam tshuam los ntawm nitriding:
ib. Hardness:
Nitriding ho nce hardness ntawm cov ntaub ntawv. Thaum lub sij hawm tus txheej txheem, cov nitrogen atoms tsim nitrides, uas yog ib tug nyuaj compound uas ua rau cov khoom hardness. Qhov kev txhim kho hardness no ua rau cov khoom tiv taus ntau dua rau hnav, puas, thiab deformation.
b. Hnav Resistance:
Nitriding txhim kho cov khoom hnav tsis kam los ntawm kev tsim cov tawv tawv, hnav-resistant nto txheej. Cov txheej no, hu ua txheej txheej, yog tsim los ntawm nitrides thiab muab kev tiv thaiv zoo tiv thaiv kev sib txhuam, yaig, thiab qaug zog saum npoo.
c. Fatigue Strength:
Kev kho nitriding tuaj yeem txhim kho qhov qaug zog ntawm cov ntaub ntawv, ua rau lawv tiv taus ntau dua rau kev thauj khoom thiab kev ntxhov siab. Cov compressive stresses induced los ntawm nitriding nyob rau hauv lub nto txheej pab mus inhibit tawg propagation thiab ua rau kom cov khoom ntawm tag nrho cov qaug zog lub neej.
d. Corrosion Resistance:
Qee hom nitriding, xws li ntsev da dej nitriding, tuaj yeem txhim kho cov khoom siv corrosion. Kev tsim cov nitrides ntawm cov khoom siv saum npoo tsim cov txheej txheem tiv thaiv uas ua rau muaj kev cuam tshuam rau cov ntsiab lus corrosive, ncua cov khoom siv lub neej nyob rau hauv ib puag ncig hnyav.
e. Dimensional Stability:
Nitriding kev kho mob txo qis qhov hloov pauv ntawm cov ntaub ntawv, kom ntseeg tau qhov zoo dua qhov ruaj khov. Cov txheej txheem induces compressive stresses rau ntawm qhov chaw, uas counteract lub tensile stresses uas feem ntau ua rau distortion los yog warping ntawm cov khoom.
f. Kev sib txhuam coefficient:
Nitriding tuaj yeem txo qhov kev sib txhuam coefficient ntawm cov ntaub ntawv, ua rau txhim kho lubricity thiab txo qis kev sib txhuam. Qhov no yog qhov tshwj xeeb tshaj yog nyob rau hauv daim ntawv thov uas tsis muaj kev sib txhuam yog xav tau, xws li hauv zawv zawg lossis rotating Cheebtsam.
4. Cov Khoom Siv Ntau Yam Kev Kho Nitriding hauv CNC Machining Kev Lag Luam:
ib. Hlau:
Hlau yog ib qho ntawm cov khoom siv feem ntau siv hauv CNC machining kev lag luam, thiab ntau qib ntawm cov hlau tau txais txiaj ntsig los ntawm kev kho nitriding. Qee cov qib hlau nrov uas tau txais nitriding suav nrog:
i. TSI 4140:
Qhov nruab nrab carbon steel no feem ntau siv rau hauv daim ntawv thov uas yuav tsum tau muaj zog thiab toughness. Nitriding AISI 4140 steel txhim kho nws qhov tawv tawv thiab hnav tsis kam, ua rau nws tsim nyog rau cov khoom raug hnyav thiab hnav.
ii. TSI 4340:
Paub txog nws lub zog siab thiab tawv, AISI 4340 steel feem ntau yog siv hauv kev siv dav hlau thiab tsheb. Nitriding qib steel no txhim kho nws cov tawv tawv, hnav tsis kam, thiab qaug zog lub zog, ua rau nws zoo tagnrho rau cov khoom tseem ceeb xws li lub zog thiab cov ncej.
iii. SIB 316:
Tnws austenitic stainless hlau yog dav siv nyob rau hauv kev lag luam uas yuav tsum tau zoo heev corrosion kuj. Nitriding AISI 316 steel txhim kho nws qhov tawv tawv thiab hnav tsis kam, thaum tuav nws cov khoom tiv thaiv corrosion.
b. Cov cuab yeej Steel:
Cov cuab yeej steel tshwj xeeb yog tsim los rau cov ntawv thov uas xav tau siab hardness, hnav tsis kam, thiab thermal stability. Qee qhov feem ntau nitrided cuab yeej steel qib suav nrog:
i. H13:
Cov cuab yeej ua haujlwm kub kub no yog siv dav hauv kev tuag-casting thiab forging daim ntaub ntawv. Nitriding H13 steel txhim kho nws qhov tawv tawv, hnav tsis kam, thiab thermal qaug zog, ua rau nws tsim nyog rau kev siv kub.
ii. D2:
Paub txog nws qhov hnav tsis kam thiab hardness, D2 cuab yeej steel feem ntau yog siv rau kev txiav thiab ua daim ntawv thov. Nitriding D2 steel txhim kho nws cov khoom saum npoo, muab kev hnav tsis kam thiab txhim kho kev ua haujlwm hauv kev xav tau kev ua haujlwm machining.
c. Hlau Casting:
Cam khwb cia hlau yog lwm yam khoom uas nquag ntsib hauv CNC machining, thiab qee qib ntawm cam khwb cia hlau tuaj yeem tau txais txiaj ntsig los ntawm kev kho nitriding. Qee cov cam khwb cia hlau uas tau txais nitriding muaj xws li:
i. G25:
Qhov no grey cam khwb cia hlau qib yog dav siv nyob rau hauv daim ntawv thov yuav tsum tau zoo machinability thiab hnav tsis kam. Nitriding G25 cam khwb cia hlau txhim kho nws cov tawv tawv thiab hnav tsis kam, ua rau nws tsim nyog rau cov khoom uas raug hnav.
ii. TXG 40:
Kuj hu ua nodular lossis ductile cam khwb cia hlau, GGG40 muaj lub zog zoo heev thiab ductility. Nitriding GGG40 cam khwb cia hlau txhim kho nws qhov tawv tawv thiab hnav tsis kam, ua rau nws tsim nyog rau cov khoom siv rau cov khoom hnyav thiab hnav.
iii. G17CrMo5-5:
Qhov kub-resistant cam khwb cia hlau qib no feem ntau siv rau hauv daim ntawv thov uas yuav tsum tau kub-kub kuj thiab hnav tsis kam. Nitriding G17CrMo5-5 cam khwb cia hlau txhim kho nws cov khoom nto, ua rau nws haum rau cov khoom raug kub thiab hnav.