Paʻa ʻolee pili ana i ka hakahaka o nā'āpana i loaʻa ma keʻano forging, hiki ke mālama i ka ikehu uila a ho'ēmi i ka ikehu. ikaika. ʻO ka maʻamau, hoʻomehana ʻia kahi billet metala no ka hana ʻana.
Ke kalaiwa anaʻāpanahe mea hana a i ʻole blank i loaʻa ma ka forging a deforming a metala blank.The mechanical properties of metal billet hiki ke hoʻololi ʻia ma ke kau ʻana i ke kaomi e hoʻohua i ka plastic deformation.