手锯加工方法扁钢的锯削：在扁钢锯口处划一周圈线，分别从宽面的两端锯下，两锯缝将要结接时，轻轻敲击使之断裂分离。这样锯削效率高，而且能较好地防止锯齿崩缺。反之若从窄面下锯，非但不经济，而且只有很少的锯齿与工件接触，工件越薄，锯齿越容易被工件的棱边钩住而折断。ProcessingmethodofhandsawSawingofflatsteel:acircularlineatthecuttingedgeofflatsteel,whichiscutdownfromthetwosidesofthewidesurface.Whenthetwosawswillbetied,itwillbegentlytappedandbrokenapart.Thesawingefficiencyishigh,andthesawtoothcollapseisprevented.Onthe,ifitissawedunderthenarrowface,itisnoteconomical,andonlyafewteetharetouchedwiththeworkpiece.Thethinnertheworkpieceis,themoreeasilythesawtoothiscaughtandbrokenbytheedgesandedgesoftheworkpiece.检查、核对模具和冲压机床。在安装模具前，要确认冲压机床为冲压工艺指定的型号，并检查模具的尺寸、工作要求是否与指定冲压机床的技术参数（装模高度、滑块行程等）相匹配，冲压机床的状态足否良好。Checkandcheckdieandstampingmachine.Beforeinstallingthemould,itisnecessarytoconfirmthatthestampingmachineisthedesignatedtypeofthestampingprocess,andcheckthesizeofthedieandtheworkrequirementstomatchthetechnicalparametersofthedesignatedstampingmachine(theheightofthedie,thesliderstroke,etc.),andthestateofthestampingmachineisgoodornot.)