ʻO ka wili kaʻa kaʻa kaʻina hana o ka wehe ʻana i nā mea ma o ka wili ʻana i nā huila. He lōʻihi loa ka mileage wili, ʻo ka hoʻohana ʻana i ka wai ʻokiʻoki ʻaʻole e hoʻonui wale i ke kumukūʻai mālama, akā e hoʻomāhuahua i ka pollution. Me ka ʻole o ka ʻoluʻolu a me ka lubrication, ʻaʻole hiki ke hoʻokuʻu ʻia ka wela i hana ʻia i ka hana wili i ka manawa, no laila e ʻike pinepine ʻia ke ahi ma hope o nā kaʻina wili kaʻa ma muli o nā kūlana maloʻo, kiʻekiʻe rotary wikiwiki o ka wili huila (~ 3600 rpm) a me ka ukana wili (~ 2000 N) [1-4], e like me ka hāʻawi ʻia ma Fig.1. No ka hoʻomaikaʻi hou ʻana i ka pono wili a loaʻa i ka pono o ka ʻili maikaʻi, ʻo ka hoʻolālā ʻana a me ka hana ʻana i nā pores i ka wili huila he ala waiwai a maikaʻi hoʻi [5].
Fig.1.ʻO ka wili ʻana i nā kuni a me nā ʻāpana etching keʻokeʻo ma ke poʻo hao.
Ua hoʻomākaukau ka poʻe akamai Kina i nā huila wili porous a hōʻike i kā lākou hana wili ma luna o kahi rig i hoʻolālā ʻia [5]. Hiki ke ʻike ʻia i ka manawa i hana ʻia ai nā pores i nā huila wili, ua hoʻemi ʻia ka ikaika compressive kiʻekiʻe e 35% mai 83.74 MPa a i 54.53 MPa. Ua hōʻike ʻia nā hopena o nā hoʻokolohua wili ʻana me ka piʻi ʻana o ka porosity o nā huila wili, ua hoʻomaikaʻi iki ka nui o ka wili ʻana, ua emi ka mahana wili a ua hoʻemi ʻia ka ukana huila. Hōʻike nā hualoaʻa i ka huila wili me ka porosity kiʻekiʻe nona ka hiki ke kāhiko ponoʻī iā ia iho, e pōmaikaʻi ana i ka pale ʻana i ka hoʻouka huila.
Kiʻi 2.ʻO ka ʻili o nā huila wili ma mua a ma hope o ka hoʻāʻo ʻana me ka porosity ʻokoʻa: 8.12%(a) & (e), 15.81%(b) & (f), 18.60%(c) & (g) a me 21.18%(d) &(h).
Ua ʻike ʻia ka ʻili ʻili keʻokeʻo paʻakikī a palupalu ma luna o nā poʻo kaʻaahi honua a pau ma muli o ka wela wili, a ʻo ka WEL mānoanoa loa i hāʻawi ʻia e ka porosity haʻahaʻa loa o nā huila wili, e like me ka hāʻawi ʻia ma Fig.3 a me Fig.4. Aia ma lalo o ka WEL kahi papa pearlite deformed i hana ʻia e ka hoʻololi ʻana ma lalo o ke koʻikoʻi o ka ʻili abrasive. ʻO ka paʻakikī o WEL he 5.77 GPa, ma kahi o 2 ~ 3 mau manawa paʻakikī ma mua o ka matrix o ka pearlite. Ua hoʻoholo ka poʻe loea he pili pili ka WEL me ka haʻihaʻi kaʻa [6-8]. Ma muli o ke ko'iko'i huila a me ke ko'iko'i o nā huila i ka wā e lawelawe ai nā ka'a, hiki ke 'ike 'ia nā māwae ma ka ili. E hoʻolaha koke ka māwae i hana ʻia ma ka papa WEL ma muli o kona ʻano palupalu, hoʻonui ʻia ma ka interface WEL a me ka perlite a i ʻole e hoʻolaha i lalo i loko o ka pearlite matrix e hana ana i nā hemahema ʻoi aku ka maikaʻi. No laila, ʻo ka paʻakikī a me ka palupalu ke kumu i ka hāʻule mua ʻana o ke kaʻa kaʻa honua a hiki ke hoʻomalu pono ʻia e ka porosity o nā huila wili.
Kiʻi 3.ʻO ka paʻakikī o WEL a me ka papa deformed.
Fig. 4.OM o nā ʻāpana keʻa o ka ʻāina kaʻaahi ma muli o ka porosity like ʻole o nā huila wili: 8.12%(a), 15.81%(b), 18.60%(c) a me 21.18%(d).
Hiki ke hōʻike ʻia ke ʻano wili o ka huila wili me nā hale pore ma ke kiʻi 5. Ma muli o ke kiʻekiʻe o ka rake maikaʻi ʻole a me ke kiʻekiʻe kiʻekiʻe o ka puʻupuʻu ʻeleʻele, heheʻe mua nā ʻāpana wili ma lalo o kahi wela kiʻekiʻe a laila paʻa i ka ʻili huila e hōʻemi ana i ka hiki ke wili o ka huila wili a hoʻonui i ka wela wili. Ma ka ʻaelike, loaʻa i ka huila porous kahi ʻoi aku ka maikaʻi o ka lole ponoʻī a hāʻawi i kahi pōʻino ʻoi aku ka maikaʻi ma luna o ke kaʻaahi[8]. Ma ka lima hoʻokahi, hoʻonui nā hale pore i ka manawa ma waena o nā grits abrasive e hāʻawi i kahi kūpono no ka mālama ʻana i nā chips a hoʻokuʻu i ka wela. Hiki ke hoʻopili ʻia nā ʻāpana i loko o ka pore a hoʻopau ʻia e ka launa pū ʻana o nā abrasives, a hiki ke hoʻololi i kahi ʻāpana o ka wela mai ka wahi pili. Ma ka ʻaoʻao ʻē aʻe, ʻoi aku ka nui o ke koʻikoʻi a me ke kiʻekiʻe protrusion no kēlā me kēia wili ikaika ma mua o ka huila wili maʻamau, e hoʻonui ai i ka mānoanoa o ka chip uncut a hōʻemi i ka hopena ʻōpala ma waena o ka abrasive grit a me ka ʻili kaʻa e hōʻemi i ka luhi mua i hana ʻia e ka wili kaʻa e like me ka mea i kūkākūkā ʻia. No laila, ma muli o ka hana wili maikaʻi a me ka hopena haʻahaʻa haʻahaʻa i ka ʻili o ke kaʻaahi, hiki i ka huila wili me ka pore ke hoʻohana ʻia i ka ʻenehana wili kaʻa ma lalo o kona kūlana kiʻekiʻe a maloʻo.
Fig. 5.ʻO ka mīkini wili o ka huila wili me nā hale pore.
Nā kuhikuhi
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