Punching pwm yog nyob rau hauv txias stamping ua, cov khoom siv (hlau lossis tsis yog hlau) ua tiav rau hauv qhov chaw (lossis cov khoom lag luam tiav) ntawm cov cuab yeej siv cov txheej txheem tshwj xeeb, paub tias txias txias stamping tuag (feem ntau hu ua txias stamping tuag).
Stamping hauv qhov kub thiab txias siv pwm tsim ntawm lub tshuab ua kom siab los thov lub siab ntawm cov khoom, kom qhov sib cais lossis yas deformation kom tau txais cov ntu ntawm cov txheej txheem ua kom siab.
