Ka paakiki o ka ili a me ka like ole onā lāʻau kalainā mea nui o nā koi ʻenehana a me ka nānā maʻamau. ʻO ka paʻakikī o ke kino e hōʻike ana i ke kūpaʻa ʻana, a me nā mea ʻē aʻe, i ka hana ʻana, hoʻohana ʻia ka resilience shore D hardness value HSd e hōʻike.
ʻO nā koi paʻakikī o nā shaft forgings e pili ana i ka pae paʻakikī o ka huila hana a i ʻole ka hui waena e pili ana me ia, a pono e mālama nā mea ʻelua i kahi pilina pili pono. Wahi a ka noiʻi e pili ana i ka hoʻopili ʻana i ka hana luhi, ʻo ka paʻakikī o ka huila kākoʻo he 10-25 HS mau ʻāpana haʻahaʻa ma mua o ka ʻāpana pili, kahi mea e pono ai ka hoʻomaikaʻi ʻana i ke ʻano luhi i ka wahi pili. Paʻakikīnā lāʻau kalaihe haʻahaʻa ka pale ʻana i ka ʻaʻahu a hiki i ka "peeling" hanana, ʻo ia hoʻi, ʻo ka papa pāpaʻu o ka ʻili o ka ʻōwili e hana i ka deformation plastic a laila hoʻopuka i ka peeling liʻiliʻi; Ke kiʻekiʻe loa ka paʻakikī, piʻi ka manawa o ka spalling brittle. No ka ha'aha'a o ka ha'iha'i 'o'ole'a waiwai o ka papa pa'akiki, ke 'ike 'ia ka māwae, e laha koke ia, e hopena i ka nui o ka spalling. Hiki i ka paʻakikī kiʻekiʻe ke hoʻopōʻino i ka luhi a me ka ʻaʻahu wikiwikinā lāʻau kalaia hoopokole i ka manawa wili onā lāʻau kalai.

I nā makahiki i hala iho nei, ʻo ka paʻakikī onā lāʻau kalaiʻO ka wili anu a me ka wili wela ua hoʻomaikaʻi maikaʻi ʻia, ʻoi aku ka nui o nā ʻōwili hana o ka wili ʻōwili wela ua kūkulu ʻia a hoʻolaha ʻia, ʻo ke kiʻekiʻe o ka paʻakikī o ka centrifugal composite high chromium cast iron rolls, centrifugal composite high chromium steel rolls and high alloy unrestricted cold cast wili hao. Ka pae oolea onā lāʻau kalaiua hiki i ka 70-83. Hiki i ka shaft forgings material a me ka ʻenehana hana ke hoʻokō i ka paʻakikī o 55-75 nui kiʻekiʻe kiʻekiʻe shaft forgings. I ka manawa like, ʻo ka hoʻohana ʻana i ka ʻenehana mālama paʻa paʻa kiʻekiʻe no ka mālama ʻana ua hōʻiliʻili nui ʻia ka ʻike.
ʻO ka supernā hoʻopaʻa ʻana i ka lāʻau nuiʻO ka wili pā he nui ka nui a me ke kaumaha i ke kaumaha, a ʻoi aku ka liʻiliʻi o ka holo kaʻa ma mua o ka wili ʻoki. No laila, ʻoi aku ka haʻahaʻa o ka pale ʻana a me nā koi paʻakikī.