Kuzimitsa kwa laser: njira yatsopano yopangira thupi la roll ndi zida zolimba
Mu mafakitale amakono, zida zozungulira monga zozungulira, zoyendera zozungulira, ndi masilinda owumitsa zimagwiritsidwa ntchito ngati maziko a mizere yopangira. Zigawozi zimakhala ndi kupsinjika kwakukulu, kukangana kwakukulu, kutentha kwambiri, ndi malo owononga. Ubwino wa pamwamba pa zigawozi umatsimikizira mwachindunji momwe zinthu zimagwirira ntchito, mtundu wa zinthu, ndi moyo wautumiki. Njira zachikhalidwe zolimbitsira pamwamba monga kuzimitsa moto ndi kulimbitsa induction, ngakhale zimagwiritsidwa ntchito kwambiri, nthawi zambiri zimakhala ndi mavuto kuphatikizapo kusintha kwakukulu, kugawa kosagwirizana kwa kuuma, komanso kugwiritsa ntchito mphamvu zambiri. Kubwera kwa ukadaulo wozimitsa laser kwasintha kwambiri, kusintha kulimbitsa pamwamba pa zozungulira kudzera muubwino wake wapadera wolondola kwambiri, kusintha pang'ono, komanso kugwira ntchito bwino kwambiri.
I. Mfundo yaikulu: Kugwirizana kwa mphamvu ndi zinthu nthawi yomweyo
Kuzimitsa kwa laser, komwe kumadziwikanso kuti laser phase-change hardening, ndi njira yolimbitsa pamwamba yomwe imagwiritsa ntchito kuwala kwa laser kokhala ndi mphamvu zambiri ngati magwero a kutentha kuti itenthetse mofulumira malo ogwirira ntchito kenako ndikudziziziritsa yokha. Ikagwiritsidwa ntchito pa ma roller bodies, mfundoyi ingagawidwe mokongola m'magawo atatu:
1. Kulowetsa Mphamvu Molondola: Mzere wa laser (nthawi zambiri CO22 kapena fiber laser) yomwe imayang'aniridwa kudzera mu optical system imapanga malo amphamvu kwambiri, omwe amagwira ntchito ngati "burashi yamatsenga" yosaoneka yomwe imayang'ana bwino pamwamba pa roller. Mkati mwa ma milliseconds mpaka masekondi, mphamvu ya laser imatengedwa ndi chophimba chachitsulo pamwamba pa roller, zomwe zimapangitsa kutentha kwake kukwera kwambiri ndi kupitirira 10,000°C pa sekondi. Kukwera kwa kutentha kwachangu kumeneku kumaposa malo osinthira gawo lofunikira (Ac3), kusintha zinthuzo kukhala kapangidwe ka austenitic. Chifukwa cha nthawi yochepa kwambiri yowonekera, kutentha sikungalowe m'magawo akuya, zomwe zimapangitsa kuti gawo lochepa (nthawi zambiri 0.1-1.5mm) litenthedwe pomwe pakati pake pamakhalabe kutentha kochepa.
2. Kusintha kwa Gawo Lomwe Limasinthasintha Nthawi Imodzi: Pamene kuwala kwa laser kwachotsedwa, njira yotenthetsera imasiya mwadzidzidzi. Kusintha kwa kutentha kwakukulu komwe kumachitika kumayambitsa kutentha mwachangu kuchokera pamwamba kupita ku kutentha kochepa, zomwe zimapangitsa kuti kutentha kuzizire kwa 10⁴-10⁶°C/s. Kuzizira kofulumira kumeneku kumalepheretsa austenite kupanga ma carbide, m'malo mwake kumasanduka kapangidwe kabwino kwambiri ka martensitic. Monga imodzi mwamapangidwe ovuta kwambiri komanso osawonongeka kwambiri pazinthu zachitsulo, martensite imafotokoza kulimba kwapamwamba komwe kumachitika kudzera mu kuzimitsa kwa laser.
3. Kapangidwe ka "Kulimba Kwakunja ndi Kulimba Kwamkati": Pomaliza pake, thupi la chozungulira limakwaniritsa mawonekedwe abwino kwambiri. Pamwamba pake pali gawo lolimba la martensitic lolimba lomwe lili ndi kuuma kwa 15%-20% kuposa chitsulo chachizolowezi chozimitsidwa, pomwe pakati pake pamakhalabe kulimba kwake koyambirira komanso mphamvu zake zabwino kwambiri. Kapangidwe kapadera ka "kunja kolimba komanso kolimba" kameneka kamathandiza chozungulira kupirira kuwonongeka kwakukulu ndikupirira katundu wovuta kwambiri, zomwe zimathandiza kupewa zoopsa zonse zosweka.
II. Njira: Kugwira ntchito mwanzeru
Kugwiritsa ntchito ukadaulo wozimitsa laser pa thupi lalikulu la roller si njira yosavuta yowunikira, koma njira yolondola yogwiritsira ntchito kuwala, makina ndi magetsi. Njira yayikulu ndi iyi:
1. Kukonza: Kuyeretsa ndi Kukonza Kuwala: Thupi la roller liyenera kukonzedwa bwino lisanazimitsidwe. Choyamba, zinthu zodetsa pamwamba monga madontho a mafuta, zigawo za oxide, ndi zonyansa zimachotsedwa bwino kudzera mu kuphulika kwa mchenga kapena kupukuta molondola kuti zitsimikizire kuti pamwamba pake pali poyera komanso powala. Gawo lomaliza lofunika kwambiri limaphatikizapo kugwiritsa ntchito utoto wapadera woyamwa kuwala. Popeza pamwamba pa chitsulo pali kuwala kwakukulu kwa ma laser enaake a wavelength, utoto uwu umathandiza kwambiri kuyamwa mphamvu ya laser (kuchokera pa 40% mpaka 80%), kuonetsetsa kuti kutentha kumasamutsidwa bwino komanso mofanana.
2. Kuwongolera njira: kupanga mapulogalamu ndi kusanthula molondola:
Kukonzekera Njira: Kutengera mawonekedwe a geometric a roller (monga cylindrical kapena conical) ndi zofunikira kuzimitsa (monga continuous helical patterns, grid textures, kapena strip-shaped zones), kompyuta imayang'anira njira yoyendetsera mutu wa laser komanso liwiro lozungulira.
Kuwongolera Mwachindunji kwa Ma Parameter: Ma parameter a process core —— laser power (P), scanning speed (V), ndi spot size (D) —— amayesedwa bwino. Kugwirizana kwa zinthu zitatu izi (energy density ≈ P/(V·D)) kumatsimikizira mwachindunji kuzama ndi kuuma kwa wosanjikiza wolimba. Njira yonseyi imachitika yokha ndi CNC system, kuonetsetsa kuti kubwerezabwereza kosayerekezeka komanso kusasinthasintha.
Kuwunika ndi Kuyankha Mafunso Pa Nthawi Yeniyeni: Makina apamwamba ali ndi zida zowunikira nthawi yeniyeni monga ma thermometer a infrared kuti azitsatira kutentha kwa dziwe losungunuka. Izi zimathandiza kusintha mwachangu mphamvu ya laser kudzera mu njira zowunikira, kupewa kutentha kwambiri kapena kusungunuka pamwamba pomwe mukusunga khalidwe lokhazikika la kuzimitsa.
3. Pambuyo pa chithandizo: Kuyang'anira ndi kutenthetsa: Mukamaliza kuzimitsa, pukutani zophimba zotsala pamwamba ndi madzi kapena mowa. Kuyesa kuuma, kuyeza kuya, ndi kusanthula kwa metallographic kwa madera olimba ndi njira zofunika kwambiri. Ngakhale kuzimitsa kwa laser kumabweretsa kupsinjika kochepa, kwa matupi ozungulira olondola kwambiri, kutenthetsa kotsika kutentha kungagwiritsidwe ntchito kuti kuthetsere kupsinjika kotsala ndikukhazikitsa mphamvu za microstructure.
III. Ubwino waukadaulo ndi mwayi wogwiritsa ntchito bwino
Poyerekeza ndi njira yachikhalidwe, kuzima kwa laser kwawonetsa ubwino wowononga pakulimbitsa ma roll:
Kuwongolera kolondola: kumatha kuletsa kuzama kulikonse kolondola mkati mwa 0.1-2.0mm, ndikusankha kulimbitsa madera ovuta monga ma grooves ndi m'mphepete.
Kusinthaku ndi kochepa kwambiri: makhalidwe a "kulowetsa kutentha pang'ono komanso liwiro lozizira mwachangu" zimapangitsa kuti kusintha kwa kutentha kwa ntchitoyo kukhale kochepa kwambiri, ndipo nthawi zambiri, kumatha kukonzedwa mwachindunji mutazimitsa, zomwe zimapangitsa kuti kuwongoka kokwera mtengo komanso kukonza kwina kusakhale kovuta.
Kuchita bwino kwambiri: kapangidwe ka martensite kamene kamapezeka kali ndi kuuma kwambiri, kutopa bwino komanso kukana dzimbiri, ndipo nthawi yogwira ntchito imatha kukulitsidwa ndi nthawi 1-3.
Yobiriwira komanso yothandiza: palibe chifukwa chozimitsira (madzi, mafuta), palibe kuipitsa; kugwiritsa ntchito mphamvu zochepa, mphamvu zambiri zodzipangira zokha, mogwirizana ndi lingaliro la kupanga zinthu zobiriwira zamakono.
Ukadaulo wozimitsa laser tsopano wagwiritsidwa ntchito kwambiri m'mafakitale osiyanasiyana, kuphatikizapo mafakitale ozungulira zitsulo, ma rollers opangira mapepala, njira zosindikizira ndi kudayira, komanso zida zofunika kwambiri popanga mapulasitiki ndi rabara. Kupatula kupanga zinthu zatsopano, njira yatsopanoyi imawonekera makamaka pankhani yokonzanso ma rollers ndi kupanganso. Imapatsa moyo watsopano ma rollers okalamba omwe akuyandikira kupuma pantchito, ndikupanga phindu lalikulu pazachuma kudzera mu luso lake losintha zinthu.
IV. Mapeto
Ukadaulo wozimitsa laser, kudzera mu kayendetsedwe kake kolondola ka mphamvu ndi zipangizo, umapatsa ma roller a mafakitale "zida" zolimba komanso zolimba. Kupambana kumeneku sikungoyimira kupita patsogolo kwakukulu pakupanga zinthu pamwamba komanso kumagwiranso ntchito ngati chida champhamvu choyendetsera kusintha kwa kupanga kupita ku njira zapamwamba, zanzeru, komanso zosamalira chilengedwe. Ndi kuchepa kosalekeza kwa ndalama zogulira zida za laser komanso kukhwima kwa njira zopangira, ukadaulo uwu udzafalikira kwambiri mbali iliyonse yopanga mafakitale, kulimbitsa kulimba mtima ndi kulimba kwa machitidwe amakono a "msana".