Jagora Don Madaidaicin CMM

Mafi yawanCmm inji (daidaita injunan aunawa) sun yi tagranite sassa.

Injin Auna Daidaitawa (CMM) na'urar aunawa mai sassauƙa kuma ta haɓaka ayyuka da yawa tare da yanayin masana'anta, gami da amfani a cikin dakin gwaje-gwaje masu inganci na gargajiya, da kuma rawar da ta fi kwanan nan na tallafawa samarwa kai tsaye a ƙasan masana'anta a cikin mafi munin yanayi.Halin zafi na ma'auni mai ɓoye CMM ya zama muhimmin abin la'akari tsakanin ayyukansa da aikace-aikacensa.

A cikin labarin da aka buga kwanan nan, ta Renishaw, an tattauna batun dabarun hawan igiyar ruwa da ƙwararrun ma'auni.

Ma'auni na Encoder suna da inganci ko dai ta thermally masu zaman kansu daga ma'aunin hawan su (mai iyo) ko kuma sun dogara da thermal a kan ma'auni (wanda aka ƙware).Ma'auni mai iyo yana faɗaɗawa kuma yana yin kwangila bisa ga halayen thermal na kayan ma'auni, yayin da ma'aunin ƙwararru yana faɗaɗa kuma yana yin kwangila daidai da ƙimar da ke ƙasa.Dabarun hawan ma'auni suna ba da fa'idodi iri-iri don aikace-aikacen auna daban-daban: labarin daga Renishaw yana gabatar da yanayin inda za a iya fifita ma'aunin ƙwararru don injunan dakin gwaje-gwaje.

Ana amfani da CMMs don ɗaukar bayanan ma'auni mai girma uku akan madaidaicin madaidaici, kayan aikin injina, kamar tubalan injin da ruwan injin jet, a zaman wani ɓangare na tsarin sarrafa inganci.Akwai nau'ikan ma'aunin daidaitawa guda huɗu: gada, cantilever, gantry da hannun kwance.CMM-nau'in gada sune wuri na kowa.A cikin ƙirar gada ta CMM, an ɗora ƙugiyar axis na Z-axis akan abin hawan da ke tafiya tare da gada.Ana tuƙi gadar tare da hanyoyi guda biyu na jagora a cikin hanyar Y-axis.Mota tana tafiyar da kafaɗa ɗaya na gada, yayin da kafada akasin haka a al'adance ba a tuka ta: tsarin gada yawanci ana jagoranta / ana goyan bayan a kan bishiyar iska.Za a iya tuka karusar (X-axis) da quill (Z-axis) ta bel, dunƙule ko injin layi.An tsara CMMs don rage kurakurai marasa maimaitawa saboda waɗannan suna da wahalar ramawa a cikin mai sarrafawa.

Babban aikin CMMs ya ƙunshi babban gado mai girma mai zafi da ƙaƙƙarfan tsarin gantry / gada, tare da ƙarancin ƙarancin inertia wanda aka haɗa na'urar firikwensin don auna fasalin kayan aiki.Bayanan da aka samar da aka yi amfani da su don tabbatar da cewa sassan sun hadu da ƙayyadaddun haƙuri.Ana shigar da madaidaicin madaidaicin madaidaicin maɓalli akan gatura X, Y da Z waɗanda zasu iya tsayin mita da yawa akan manyan injuna.

Wani nau'in gada mai nau'in granite CMM wanda ke aiki a cikin ɗaki mai kwandishan, tare da matsakaicin zafin jiki na 20 ± 2 ° C, inda yanayin zafin dakin ke kewaya sau uku a kowace sa'a, yana ba da izinin babban granite mai zafi don kula da matsakaicin matsakaicin zazzabi na 20 °C.Rikicin bakin karfe mai linzamin linzamin kwamfuta da aka sanya akan kowane axis na CMM zai kasance mai zaman kansa da yawa daga ma'aunin granite kuma yana amsa da sauri ga canje-canje a yanayin zafin iska saboda babban yanayin zafi da ƙarancin zafi, wanda ya fi ƙasa da yawan zafin jiki na tebur granite. .Wannan zai haifar da matsakaicin faɗaɗawa ko ƙanƙancewa na ma'aunin sama da daidaitaccen axis na 3m na kusan 60 µm.Wannan fadadawa na iya haifar da babban kuskuren aunawa wanda ke da wahalar ramawa saboda yanayin saɓanin lokaci.

Ma'aunin ƙwaƙƙwaran ma'auni shine zaɓin da aka fi so a wannan yanayin: ma'aunin ƙwararru kawai zai faɗaɗa tare da ƙimar haɓakar haɓakar thermal (CTE) na granite substrate kuma, don haka, zai nuna ɗan canji don mayar da martani ga ƙananan oscillations a cikin zafin iska.Dole ne a yi la'akari da canje-canje na dogon lokaci a cikin zafin jiki kuma waɗannan za su shafi matsakaicin zafin jiki na babban ma'aunin zafi mai zafi.Matsakaicin ramuwa yana da sauƙi kamar yadda mai sarrafawa kawai ke buƙatar rama yanayin zafi na injin ba tare da la'akari da yanayin yanayin zafi ba.

A taƙaice, tsarin encoder tare da ƙwararrun ma'auni shine kyakkyawan mafita ga madaidaicin CMMs tare da ƙarancin CTE / babban ma'aunin zafi da sauran aikace-aikacen da ke buƙatar manyan matakan aikin awo.Fa'idodin ƙwararrun ma'auni sun haɗa da sauƙaƙe tsarin tsarin ramuwa na thermal da yuwuwar rage kurakuran ma'auni marasa maimaitawa saboda, alal misali, bambancin zafin iska a yanayin injin gida.