Cov khoom siv preformed ua los ntawm cov pwm preforming ib txwm muaj qhov tsis zoo:

Tom qab lub preformed thaiv yog muab tso rau hauv lub kub-pressing pwm thiab kub-nias yog ua tiav, ib feem ntawm cov hlau rov qab qhov yog feem ntau tsis muaj cov khoom.

Tam sim no cov pwm no tuaj yeem daws qhov teeb meem no zoo heev.

Cov yam ntxwv ntawm cov pwm no yog:

(1) Muaj cov qhov me me hauv qhov sib thooj ntawm cov punch

(2) Cov preforms uas tsim muaj protrusions

(3) Rau kev tsim khoom: cov neeg caij tsheb nres tsheb, tsheb nres tsheb, CV nres ncoo

Lub ntsiab parameter ntawm pwm yog raws li nram no: