Kapangidwe ka Mpira

Mpira wokhala ndi zigawo zinayi zofunika: mpira, mphete yamkati, mphete yakunja, ndi khola. Mapiritsi ambiri a mpira wamafakitale amakumana ndi miyezo ya AISI 52100. Mipira ndi maling'i nthawi zambiri amapangidwa ndi chitsulo chapamwamba-chromium chokhala ndi Rockwell C-yolimba molimba pafupifupi 61-65. Chosungiracho, komabe, chimakhala cholimba chocheperapo kuposa mipira ndi mphete ndipo chimatha kupangidwa ndi chitsulo (monga sing'anga-carbon steel ndi aluminiyamu alloy) kapena zinthu zopanda zitsulo (monga Teflon, PTFE, ndi polima). Mipira imakhala ndi mikangano yocheperako kuposa zotengera zamajeti, zomwe zimapangitsa kuti kutentha kumatsike pa liwiro lozungulira lomwelo.