Zomwe zimayambitsa mawanga akuda pamtunda wa 38CrMoAlstel mbiya yamakina omangira jekeseni

38CrMoAl zitsulo pambuyo pa nitriding mwana, kuuma pamwamba kumatha kufika kupitilira 1200HV, nitriding wosanjikiza kuya 1mm kapena kuposa, amagwiritsidwa ntchito popanga mphamvu zotopa kwambiri, mkulu kuvala kukana mbali, monga tsinde lalikulu la bedi la lathe, finyani wandiweyani screw, mbiya, etc.. [1]. Njira yopangira zitsulo za 38CrMoAl ndi motere: kufa kuponyera ingot → kufota kotentha → kubisa kanthu → kudula pakati → kuthimitsa ndi kutentha mankhwala → chithandizo cha nitriding → Machining. Kuyesedwa kwa thupi ndi mankhwala ndi kusanthula kunachitika kuti adziwe chomwe chimayambitsa mawanga akuda pamwamba pa silinda..

1 kuyezetsa thupi ndi mankhwala 1.1 kuyang'ana kwakukulu

Monga tikuonera pa Chithunzi 1, pali wandiweyani mawanga akuda pamwamba pa mbiya.Kusakhazikika banga ndi kugawa

1.2 Kusanthula kwa mankhwala

Chitsanzocho chinatengedwa pamalo akuda pamtunda wa makina ojambulira pulasitiki, ndipo mankhwalawo adawunikidwa. Zotsatira zikuwonetsedwa mu Table 1, zomwe zikuwonetsa kuti mankhwala ake ndi odzaza ndi GB / T 3077-2015 < Standard Pair ya Gold Bonded Steel

Zofunikira zaukadaulo zachitsulo cha 38CrMoAl

1.3 Kusanthula kwa SEM

Chitsanzocho chinatengedwa pamalo akuda pamwamba pa mbiya yakuthupi ya makina opangira jakisoni apulasitiki, ndi pambuyo kuyeretsa ndi akupanga yoweyula, FEIQ U AN TA 400F idagwiritsidwa ntchito. Maonekedwe a madontho akuda anali dzenje la madzi oundana a shuga, ndi mawonekedwe apamwamba adawonedwa ndi SEM. Monga tikuonera pa Chithunzi 2, mbiya pamwamba pakamwa ndi mawonekedwe, palibe makina processing zizindikiro.

Zitsanzo zoyankhulana zamagulu osiyanasiyana zidalandidwa pamalo akuda pamwamba pa silinda yamakina omangira jekeseni., ndipo morphology yagawo idawonedwa. Itha kuwoneka kuchokera mkuyu. 3 kuti pali ming'alu yambiri mu gawo la silinda, ming'alu m'madera osiyanasiyana imagawidwa mosagwirizana, palibe zochitika zamakutidwe ndi okosijeni komanso zosapanga zitsulo kuzungulira ming'alu, ndipo nitride wosanjikiza pamwamba pa malo amderalo amagwa.

Zitha kuwoneka kuchokera mkuyu. 4 kuti makulidwe a woyera owala wosanjikiza (pawiri wosanjikiza) mu nitrided wosanjikiza pamwamba pa yamphamvu ndi wosagwirizana, ndipo ming'alu ya m'dera lokhuthala la nitrided layer imakhalanso yochulukirapo, ndipo ming’aluyo inang’ambika m’malire a tirigu. Kapangidwe ka matrix a silinda ndi bainite ndipo kukula kwambewu ndi kwakukulu.

2 Kusanthula ndi kukambirana

Kapangidwe ka mbiya yazinthu zamakina opangira jakisoni wapulasitiki kumagwirizana ndi zofunikira za chitsulo cha 38CrMoAl malinga ndi GB. / Mtengo wa T3077-2015. Gome la mbiya

Pali mawanga akuda. Mwa kusanthula ma electron maikulosikopu, titha kuona kuti mawanga akuda pamtunda ndi shuga wa crystal – ngati maenje. Ming'alu yomwe imafalikira m'malire a tirigu imatha kuwoneka pagawo lopingasa la mbiya, ndipo palibe mankhwala opangidwa ndi okosijeni komanso zosakaniza zopanda zitsulo kuzungulira ming'alu, kusonyeza kuti ming'alu alibe chochita ndi inclusions mu zitsulo, ndipo ming'alu imapangidwa pambuyo pa chithandizo cha kutentha. Zotsatira za kuyezetsa kwa metallographic zikuwonetsa kuti pali ming'alu yochulukirapo pagawo la kuwala koyera mu nitriding wosanjikiza, ndipo makulidwe a wosanjikiza woyera wowala wamba amaposa 50 m m. Mapangidwe a gawo lapansi la silinda ndi Bayesian ndipo njere zake ndi zolimba.

Kafukufuku wasonyeza kuti pambuyo nitriding wa workpiece, woyera wowala wosanjikiza pamwamba nitriding wosanjikiza wapangidwa mmodzi kapena awiri a xi gawo, ndi gawo, γ 'gawo, amatchedwanso wosanjikiza, chifukwa sichapafupi kuipitsidwa ndi mawu wamba, kotero ndi yoyera yowala pansi pa galasi lagolide lowonetsa micro [2-3]. Kong Dequn et al.. [5] kafukufuku akusonyeza kuti masanjidwewo dongosolo pamaso nitriding zimakhudza kwambiri makulidwe a woyera owala wosanjikiza pambuyo nitriding. Kuchulukira kwake kukula kwa njere ya kapangidwe ka matrix, m'pamenenso yoyera yowala wosanjikiza pambuyo nitriding, ndi sachedwa kutayikira chodabwitsa. Nsalu zofanana ndi zazing'ono zobwezerezedwanso za sorbite zitha kupezeka kuchokera 38 CrMoAl Chitsulo pambuyo kutentha mankhwala [6] , koma mtanda wa ntchito pambuyo quenching ndi tempering processing, kukula kwambewu ndi kwakukulu, kumabweretsa mapangidwe wosanjikiza wa makulidwe osagwirizana a padziko workpiece pambuyo nitriding woyera owala wosanjikiza. Chosanjikiza choyera chopangidwa pamwamba pa mbiya pambuyo pa nitriding chimakhala cholimba kwambiri ndipo chimatha kukulitsa kukana kwa chogwiriracho.. Komabe, kuwala koyera wosanjikiza nthawi zambiri kumakhala ndi brittleness yokulirapo, ndi kuwonjezeka kwa makulidwe a kuwala koyera wosanjikiza, kuwala koyera kudzakhala kotayirira (osati wandiweyani), monga zipatso masangweji lotayirira, mu workpiece kupukuta kudzaoneka peeling, kupukuta ndi zochitika zina monga [4]. Kafukufuku wokhudzana ndi izi akuwonetsa [7-9], chifukwa cha kuuma kwa pamwamba kwa workpiece, monga pamwamba carburizing kapena nitriding chithandizo cha workpiece, mu makina, monga kulamulira njira yopera, angapewe m'badwo wa akupera ming'alu.

Powombetsa mkota, mbiya pamwamba nitriding m'njira zosiyanasiyana, mu njira yopera, nitriding wosanjikiza mu woyera owala wosanjikiza wandiweyani kusweka intergranular ndi nitriding wosanjikiza spalling chodabwitsa, chomwe ndi mbiya pamwamba mawanga wakuda ngati zilema chifukwa chachikulu.

Mapeto ndi malingaliro

(1) osagwirizana nitriding padziko 38 C r M o A l chitsulo yamphamvu kwa jekeseni akamaumba makina

Uniform, m'kati mwa makina, Malo okhuthala a nitrided wosanjikiza pamwamba pa silinda amang'amba motsatira kristalo ndikuchotsa wosanjikiza wa nitrided., kupanga dzenje la punctate, chomwe ndi chifukwa chachikulu cha malo akuda pamwamba pa silinda.

• zikunenedwa kuti mawonekedwe a yunifolomu ndi abwino a sorbite angapezeke powonjezera ndi kusintha mawonekedwe kuti atsimikizire kuti yunifolomu ndi mawonekedwe abwino a sorbite a silinda.. Kwa workpiece ndi mkulu pamwamba kuuma, tcheru ayenera kulipidwa akafuna clamping wa workpiece mu ndondomeko Machining, kuti mupewe kupukutira zolakwika zomwe zimayambitsidwa ndi kukanikizana kwa workpiece.

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