Cov pwm siv rau kev txhaj molding, tshuab moulding, extrusion, tuag casting los yog forging xovxwm molding, smelting, stamping thiab lwm txoj hauv kev tau ntau yam pwm thiab cov khoom siv rau cov khoom. Hauv ntej, lub pwm yog ib qho cuab yeej ua khoom ua molding, uas yog ua los ntawm ntau qhov chaw, thiab ntau qhov chaw yog ua los ntawm ntau qhov chaw. Nws tsuas pom cov khoom ntawm hom khoom los ntawm kev hloov lub xeev lub cev ntawm cov khoom siv molding. Nws muaj lub npe ntawm "niam ntawm kev lag luam".
Nyob rau hauv sab nraud lub zog, qhov seem yuav yog ib lub cuab tam nrog ib qho kev zoo thiab kev loj. Nws yog dav siv nyob rau hauv kev sib tsoo, forging, nias, hmoov hlau metallurgy, siab casting, yas, roj hmab, ceramics, thiab lwm yam. Cov pwm muaj ib qho kev sib thooj los yog cov kab hauv puab, thiab cov duab ntawm cov hniav yuav tsum sib cais raws li cov duab ntawm lub contour. Qhov luaj li cas ntawm cov kab noj puab yuav siv tau los coj tus qauv sib thooj. Cov pwm feem ntau muaj ob feem: tsiv tuag thiab pwm (lossis punch thiab tuag), uas muab faib ua ob ntu. Tshem tawm cov khoom thaum lawv sib cais lawm, thiab ces daim ntawv yuav muab tso rau hauv cov kab pwm. Pwm yog ib qho cuab yeej, qhov zoo tshaj plaws, dais lub zog qoob loo ntawm lub pob, lub zog ntawm kev ruaj ntseg, nruj, qhov nyuaj hardness, qhov chaw roughness thiab machining cov neeg tau thov dua, kev tsim qib pwm yog ib qho tseem ceeb ntawm cov theem ntawm cov qib mechanical manufacturing.