Ukuqonda Ngokucophelela kwe-CMM

Iningi laboImishini ye-Cmm (imishini yokulinganisa ehlanganisiwe) zenziwe yiizingxenye ze-granite.

Imishini Yokulinganisa Ehlanganisiwe (i-CMM) iyithuluzi lokulinganisa eliguquguqukayo futhi ithuthukise izindima eziningana endaweni yokukhiqiza, okuhlanganisa ukusetshenziswa elabhorethri yekhwalithi yendabuko, kanye nendima yakamuva yokusekela ngqo ukukhiqizwa endaweni yokukhiqiza ezindaweni eziqinile. Ukuziphatha kokushisa kwezikali ze-encoder ze-CMM kuba yinto ebalulekile phakathi kwezindima zayo kanye nokusetshenziswa kwayo.

Esihlokweni esisanda kushicilelwa, esibhalwe nguRenishaw, kuxoxwa ngendaba yamasu okufaka isikali se-encoder esintantayo nesinolwazi.

Izikali ze-encoder zizimele ngokushisa ku-substrate yazo yokufaka (entantayo) noma zincike ngokushisa ku-substrate (eqondiwe kahle). Isikali esintantayo siyakhula futhi sinciphe ngokwezici zokushisa zezinto zesikali, kanti isikali esiqondiwe siyakhula futhi sinciphe ngesivinini esifanayo ne-substrate engaphansi. Amasu okufaka isikali sokulinganisa anikeza izinzuzo ezahlukahlukene zezinhlelo zokusebenza zokulinganisa ezahlukahlukene: isihloko esivela ku-Renishaw sibonisa icala lapho isikali esiqondiwe singaba yisisombululo esithandwayo semishini yelebhu.

Ama-CMM asetshenziselwa ukubamba idatha yokulinganisa enezinhlangothi ezintathu ezintweni ezisebenza ngokunemba okuphezulu, ezifakwe ngomshini, njengezithiyo zenjini kanye nama-blade enjini yejethi, njengengxenye yenqubo yokulawula ikhwalithi. Kunezinhlobo ezine eziyisisekelo zomshini wokulinganisa ohlanganisayo: ibhuloho, i-cantilever, i-gantry kanye nengalo evundlile. Ama-CMM ohlobo lwebhuloho avame kakhulu. Ekwakhiweni kwebhuloho le-CMM, i-quill ye-Z-axis ifakwe enqoleni ehamba eceleni kwebhuloho. Ibhuloho liqhutshwa ngezindlela ezimbili zokuqondisa ohlangothini lwe-Y-axis. Injini ishayela ihlombe elilodwa lebhuloho, kuyilapho ihlombe eliphambene livame ukungaqhutshwa: isakhiwo sebhuloho ngokuvamile siqondiswa/sisekelwa kuma-bearings aerostatic. Inqola (i-X-axis) kanye ne-quill (i-Z-axis) zingaqhutshwa yibhande, isikulufu noma i-linear motor. Ama-CMM aklanyelwe ukunciphisa amaphutha angaphindwa njengoba lokhu kunzima ukuwabuyisela kusilawuli.

Ama-CMM asebenza kahle aqukethe umbhede we-granite oqinile oshisayo kanye nesakhiwo se-gantry/bridge esiqinile, esine-quill ephansi enamathiselwe kuyo inzwa yokulinganisa izici zomsebenzi. Idatha ekhiqizwe isetshenziselwa ukuqinisekisa ukuthi izingxenye ziyahlangabezana nokubekezelelana okunqunyiwe. Ama-encoder aqondile aphezulu afakwe kuma-axis ahlukene e-X, Y kanye ne-Z angaba amamitha amaningi ubude emishinini emikhulu.

I-CMM ejwayelekile yebhuloho le-granite esetshenziswa ekamelweni elinomoya opholile, elinokushisa okumaphakathi okungu-20 ±2 °C, lapho izinga lokushisa legumbi lijikeleza kathathu ngehora, livumela i-granite enokushisa okuphezulu ukuthi igcine izinga lokushisa elimaphakathi elingama-20 °C. I-encoder yensimbi engagqwali entantayo efakwe ku-axis ngayinye ye-CMM izobe izimele kakhulu ku-substrate ye-granite futhi isabela ngokushesha ezinguqukweni zokushisa komoya ngenxa yokushisa kwayo okuphezulu kanye nokushisa okuphansi, okuphansi kakhulu kunesisindo sokushisa setafula le-granite. Lokhu kuzoholela ekwandeni okukhulu noma ekuncipheni kwesikali phezu kwe-axis ejwayelekile engu-3m ​​cishe engu-60 µm. Lokhu kwanda kungadala iphutha elikhulu lokulinganisa okunzima ukulilungisa ngenxa yemvelo yalo eshintshashintshayo yesikhathi.

Isikali esiqondiswe yi-substrate yisinqumo esikhethwayo kulokhu: isikali esiqondiswe yi-substrate singanda kuphela nge-coefficient of thermal expansion (CTE) ye-granite substrate futhi, ngakho-ke, sizobonisa ushintsho oluncane ekuphenduleni ukushukuma okuncane ekushiseni komoya. Izinguquko zesikhathi eside ekushiseni kumele zicatshangelwe futhi lokhu kuzothinta izinga lokushisa elimaphakathi le-substrate enesisindo esiphezulu. Isinxephezelo sokushisa silula njengoba isilawuli sidinga kuphela ukunxephezela ukuziphatha kokushisa komshini ngaphandle kokucabangela nokuziphatha kokushisa kwesikali se-encoder.

Ngamafuphi, izinhlelo zokufaka ikhodi ezinezikali eziqondiswe yi-substrate ziyisisombululo esihle kakhulu sama-CMM anembile anezikali eziphansi ze-CTE / ezishisayo eziphezulu kanye nezinye izinhlelo zokusebenza ezidinga amazinga aphezulu okusebenza kwe-metrology. Izinzuzo zezikali eziqondiswe zifaka phakathi ukwenza lula izindlela zokunciphisa ukushisa kanye nethuba lokunciphisa amaphutha okulinganisa angaphindwa ngenxa, isibonelo, ukushintshashintsha kwezinga lokushisa lomoya endaweni yomshini wendawo.