Txij li cov molds tau ua khoom siv kim heev, lawv feem ntau tsuas yog siv los ua cov khoom loj uas ntau txhiab qhov tau ua. Cov pwm pluaj yog tsim los ntawm steel hlau, pre-hardened steel, aluminium, thiab / los yog beryllium-tooj liab alloy.
Qhov kev xaiv ntawm cov ntaub ntawv tsim kom muaj pwm los ntawm yog feem ntau ntawm kev lag luam; feem ntau, cov phom molds ntau dua los tsim, tab sis lawv ntev lifespan yuav offset tus nqi pib dua ib tug ntau dua cov khoom ua ntej hnav tawm.
Pre-hardened pwm cov pwm tsis tshua hnav-resistant thiab siv rau kev txo cov ntim qis dua lossis cov khoom loj; lawv cov hlau nyuaj yog 38-45 nyob rau ntawm Rockwell-C scale. Cov hlau pwm hardened yog kub tom qab ua haujlwm; cov no yog nyob deb tshaj plaws hauv kev coj hnyav thiab kev ua neej. Kev kub nyhiab feem ntau yog nruab nrab ntawm 50 thiab 60 Rockwell-C (HRC). Aluminium molds yuav raug nqi tsawg dua, thiab thaum tsim thiab machined nrog cov khoom siv niaj hnub siv tau yig rau molding kaum lossis txawm ntau pua txhiab qhov.
Beryllium tooj liab yog siv nyob rau thaj chaw ntawm cov pwm uas yuav tsum tau ceev hluavtaws raug tshem tawm lossis cov cheebtsam uas pom cov tsho kub siab tshaj plaws.Qhov moulds yuav raug tsim los ntawm CNC machining lossis siv hluav taws xob paug machining cov txheej txheem.