Nā mea hana kūkulu paʻa i ka wela. E hōʻoia i nā lālā mua o ke kūkulu ʻana o ka mīkini i hana ʻia me nā mea i emi iki ka maʻalahi i nā loli o ka mahana. E noʻonoʻo i ke alahaka (ka axis X o ka mīkini), nā kākoʻo alahaka, ke ala alakaʻi (ka axis Y o ka mīkini), nā bearings a me ka pā axis Z o ka mīkini. Hoʻopilikia pololei kēia mau ʻāpana i nā ana a me ka pololei o ka neʻe ʻana o ka mīkini, a hana i nā ʻāpana iwi kuamoʻo o ka CMM.
Hana nā ʻoihana he nui i kēia mau ʻāpana mai ka alumini ma muli o kona māmā, ka machinability a me ke kumukūʻai haʻahaʻa. Eia nō naʻe, ʻoi aku ka maikaʻi o nā mea e like me ka granite a i ʻole ka keramika no nā CMM ma muli o ko lākou kūpaʻa wela. Ma waho aʻe o ka ʻoiaʻiʻo e hoʻonui ka alumini i aneane ʻehā manawa ma mua o ka granite, loaʻa i ka granite nā ʻano dampening vibration kiʻekiʻe a hiki ke hāʻawi i kahi hoʻopau ʻili maikaʻi loa e hiki ai i nā bearings ke hele. ʻO ka ʻoiaʻiʻo, ʻo Granite ke kūlana i ʻae nui ʻia no ke ana ʻana no nā makahiki.
No nā CMM, akā naʻe, hoʻokahi hemahema o ka granite - he kaumaha. ʻO ka pilikia, ʻo ia ka hiki, ma ka lima a i ʻole ma ka servo, ke hoʻoneʻe i kahi CMM granite ma kona mau koʻi e lawe i nā ana. Ua loaʻa i kahi hui, ʻo The LS Starrett Co., kahi hopena hoihoi i kēia pilikia: Hollow Granite Technology.
Hoʻohana kēia ʻenehana i nā papa granite paʻa a me nā kaola i hana ʻia a hoʻākoakoa ʻia e hana i nā lālā kūkulu hakahaka. ʻO ke kaumaha o kēia mau hale hakahaka e like me ka alumini me ka mālama ʻana i nā ʻano wela maikaʻi o ka granite. Hoʻohana ʻo Starrett i kēia ʻenehana no nā lālā kākoʻo o ke alahaka a me ke alahaka. Ma ke ʻano like, hoʻohana lākou i ka keramika hakahaka no ke alahaka ma nā CMM nui loa i ka wā hiki ʻole ke granite hakahaka.
Nā Bearings. Ua haʻalele ka hapa nui o nā mea hana CMM i nā ʻōnaehana roller-bearing kahiko, e koho ana i nā ʻōnaehana ea-bearing ʻoi aku ka maikaʻi. ʻAʻole pono kēia mau ʻōnaehana i ka hoʻopili ʻana ma waena o ka bearing a me ka ʻili bearing i ka wā e hoʻohana ai, e hopena ana i ka ʻaʻahu ʻole. Eia kekahi, ʻaʻohe ʻāpana e neʻe ana o nā bearings ea, a no laila, ʻaʻohe walaʻau a haʻalulu paha.
Eia nō naʻe, he ʻokoʻa ko nā bearings ea. ʻO ke kūpono, e ʻimi i kahi ʻōnaehana e hoʻohana ana i ka graphite porous ma ke ʻano he mea bearing ma kahi o ka alumini. ʻO ka graphite i loko o kēia mau bearings e ʻae i ka ea i hoʻopaʻa ʻia e hele pololei ma o ka porosity kūlohelohe i loko o ka graphite, e hopena ana i kahi papa ea i hoʻopuehu like ʻia ma luna o ka ʻili bearing. Eia kekahi, ʻo ka papa ea a kēia bearing e hana ai he lahilahi loa - ma kahi o 0.0002″. ʻO nā bearings alumini ported maʻamau, ma ka ʻaoʻao ʻē aʻe, he maʻamau ka hakahaka ea ma waena o 0.0010″ a me 0.0030″. ʻOi aku ka maikaʻi o kahi hakahaka ea liʻiliʻi no ka mea e hōʻemi ana i ke ʻano o ka mīkini e lele ma luna o ka cushion ea a hopena i kahi mīkini ʻoi aku ka paʻa, pololei a hiki ke hana hou ʻia.
Manual vs. DCC. He maʻalahi loa ka hoʻoholo ʻana inā e kūʻai i kahi CMM manual a i ʻole kahi automated. Inā pili kāu wahi hana mua i ka hana ʻana, a laila ʻo ka mīkini i kāohi pololei ʻia e ka kamepiula kāu koho maikaʻi loa i ka wā lōʻihi, ʻoiai e ʻoi aku ke kiʻekiʻe o ke kumukūʻai mua. He kūpono nā CMM manual inā e hoʻohana nui ʻia lākou no ka hana nānā ʻana i ka ʻatikala mua a i ʻole no ka ʻenekinia hoʻohuli. Inā hana ʻoe i ka nui o nā mea ʻelua a ʻaʻole makemake ʻoe e kūʻai i ʻelua mīkini, e noʻonoʻo i kahi DCC CMM me nā drive servo disengagable, e ʻae ana i ka hoʻohana lima i ka wā e pono ai.
ʻŌnaehana hoʻokele. I ke koho ʻana i kahi DCC CMM, e ʻimi i kahi mīkini me ka ʻole o ka hysteresis (backlash) i loko o ka ʻōnaehana hoʻokele. Hoʻopilikia maikaʻi ʻole ka Hysteresis i ka pololei o ke kūlana o ka mīkini a me ka hana hou ʻana. Hoʻohana nā hoʻokele friction i kahi ʻau hoʻokele pololei me kahi kāʻei hoʻokele kikoʻī, e hopena ana i ka hysteresis ʻole a me ka haʻalulu liʻiliʻi.
Ka manawa hoʻouna: Ian-19-2022