ʻO ke ʻano hana maʻamau no nā blank piston aluminika ʻo ke ʻano hoʻoheheʻe gravity metala. ʻO ka mea kūikawā, ua hoʻomaka ka hana ʻana i nā mīkini metala o kēia manawa e nā mīkini mīkini CNC, hiki ke hōʻoia i ka pololei o ka nui blank kiʻekiʻe, ka huahana kiʻekiʻe a me ke kumukūʻai haʻahaʻa. No ka lua piston paʻakikī, hiki ke hoʻokaʻawale ʻia ke kumu metala i ʻekolu, ʻelima a ʻehiku mau ʻāpana e hoʻoheheʻe ʻia, ʻoi aku ka paʻakikī a ʻaʻole lōʻihi. ʻO kēia ʻano hoʻoheheʻe ʻumekaumaha i kekahi manawa e hoʻopuka i nā hemahema e like me nā māwae wela, nā pores, nā pinholes, a me ka wehe ʻana o ka piston blank.

I nā ʻenekini i hoʻoikaika ʻia, hiki ke hoʻohana ʻia nā pistons alumini alumini, nā mea i hoʻomaʻemaʻe ʻia, ka hāʻawi ʻana i ka streamline metala maikaʻi, ka ikaika kiʻekiʻe, ke ʻano metala maikaʻi a me ka conductivity thermal maikaʻi. No laila ʻoi aku ka haʻahaʻa o ka piston ma mua o ka hoʻolei ʻana i ka gravity. ʻO ka piston he elongation kiʻekiʻe a me ka paʻakikī maikaʻi, he mea maikaʻi ia no ka hoʻohaʻahaʻa ʻana i ke kaumaha. Eia nō naʻe, ʻaʻole kūpono nā alloys aluminika-silikona hypereutectic i ʻoi aku ma mua o 18% silika no ka hana ʻana ma muli o ko lākou brittleness, a ʻo ka forging ka mea e hoʻoulu ai i ke koʻikoʻi nui i ka piston. No laila, ʻo ke kaʻina hana forging, ʻoi aku ka maikaʻi o ka wela forging hope a me ka mahana mālama wela, pono e kūpono, a ʻo ka hapa nui o nā māwae i ka piston forged i ka wā e hoʻohana ai ke kumu o ke kaumaha. He koi koʻikoʻi ka Forging i ke ʻano o ka hoʻolālā piston a me ke kumukūʻai kiʻekiʻe.

Ua hoʻomaka ʻia ke kaʻina hana hoʻoheheʻe wai i ka hana ʻana a puni ke Kaua Honua ʻElua, a ua hāpai ʻia a hoʻohana ʻia i nā pae like ʻole ma nā ʻāina like ʻole a puni ka honua. Ua hoʻokō ʻia ka ulu wikiwiki ʻana i nā makahiki he ʻumi i hala. Ua hoʻomaka koʻu ʻāina e hoʻohana i kēia kaʻina hana ma 1958 a he 40 mau makahiki.

Liquid make forging mea e ninini i kekahi nui o ka wai metala i loko o ka metala mold, pressurize me ka punch, no laila ka wai metala e hoopiha i ka lua i ka haʻahaʻa loa ma mua o ka make hoolei ana, a crystallizes a solidifies ma lalo o ke kaomi e loaʻa i ka mānoanoa. hale kūkulu. Nā huahana me ka ʻole o ka shrinkage cavity, shrinkage porosity a me nā hemahema ʻē aʻe. Loaʻa i kēia kaʻina nā ʻano o ka hoʻolei ʻana a me ka forging.