Secondly , the steel balls millstone is used to grind steel ball in ones steel ball factory , and process flocculus the steel balls that possess reticulate veins surface . measure the result as follows : ra ( surface roughness of steel ball ) = 0 . 015 u m , wavmess = 0 . 06 um , sph ( deviation from spherical form ) = 0 . 010 u m , vdwl ( variation of ball lot diameter ) = 0 . 015 u m 然后利用制成的鋼球研磨板對(duì)鋼球進(jìn)行超精磨削加工,加工出了表面具有網(wǎng)狀紋理形貌的“絨面”鋼球,利用儀器測(cè)量鋼球表面的粗糙度值達(dá)到了0 . 015 m ,表面波紋度值達(dá)到了0 . 006 m ,圓度達(dá)到了0 . 010 m ,球批直徑變動(dòng)量小于0 . 015 m 。