Txhaj molding tsim tswv yim

Txhaj tshuaj molding yog txheej txheem tsim khoom uas txhaj cov khoom molten rau hauv pwm los tsim cov khoom. Cov txheej txheem no tuaj yeem siv cov khoom sib txawv, xws li thermoplastic, polymer, lossis elastomer. Cov khoom molten yog pub rau hauv ib lub thoob los ntawm ib lub funnel, qhov twg nws yog rhuab, melted, thiab tov. Tom qab ntawd txhaj rau hauv pwm. Tom qab solidification, cov khoom occupies lub puab kab noj hniav. Txhaj tshuaj molding tshuab yog dav siv nyob rau hauv loj-scale ntau lawm vim hais tias nws generates kuj tsis tshua muaj pov tseg ntau lawm thiab muaj siab repeatability.
Lub universality ntawm kev txhaj tshuaj molding tshuab xav tau kev xav dav dav. Feem ntau cov kev txiav txim siab tsim yuav ua rau pwm tom qab tsim cov khoom yuav tsum tau ua. Qee yam uas cuam tshuam rau kev tsim muaj xws li: yuav ua li cas cov khoom siv (raws li ib yam khoom lossis rau kev sib dhos), lawv qhov loj thiab cov kev xav tau ntawm cov tshuab, thiab lawv lub peev xwm los tiv thaiv cov tshuaj lom neeg los yog siab. Hauv qab no yog qee cov tswv yim tseem ceeb los xav txog thaum tsim kev txhaj tshuaj molding.
Ua tib zoo xaiv cov ntaub ntawv uas tsim nyog rau koj tus qauv tsim
Cov khoom sib txawv muab cov yam ntxwv sib txawv. Piv txwv li, qee cov ntaub ntawv txhaj tshuaj molding muab kev ruaj ntseg ntau dua li lwm cov ntaub ntawv. Ib yam li ntawd, qee qhov kev cog lus nrog cov nplaum zoo dua li lwm tus. Kev tsim cov khoom siv suav nrog cov hauv qab no: kub, siab, lom thiab tshuaj lom neeg sib cuam tshuam. Thermoplastic resins tuaj yeem muab faib ua amorphous thiab semi crystalline. Txawm hais tias semi crystalline thermoplastic plastics muab cov tshuaj tiv thaiv zoo dua thiab hluav taws xob tiv thaiv, lawv cov khoom siv amorphous muaj ntau dua qhov ruaj khov thiab cuam tshuam. Kev xaiv cov khoom tuaj yeem cuam tshuam rau qib siab ntev lossis qee yam nta (xws li phab ntsa thickness).
Xav txog qhov kam rau ua
Pwm feem ntau yog npaj nrog nruj kam rau ua thiab feem ntau muaj CNC tolerances txog li {{0}}.005 hli. Tab sis raws li cov yas txias, shrinkage tshwm sim, nyob ntawm seb cov khoom. Qee cov polymers cog lus ntau dua li lwm tus. Piv txwv li, txawm hais tias qhov siab tshaj plaws shrinkage tus nqi ntawm PLA tuaj yeem xav tias yuav yog 0.5%, tus nqi shrinkage ntawm PEEK yuav siab li 1.5%. Thaum tsim cov khoom siv thiab siv qhov ntev, nws yog ib qho tseem ceeb uas yuav tsum xav txog qhov shrinkage thiab hom khoom siv.
Xaiv cov phab ntsa uas tsim nyog
Cov nram qab no yog pom zoo phab ntsa thicknesses rau cov khoom sib txawv:
ABS: 1.143 mm -3.556 mm
Acetaldehyde: 0.762 hli -3.048 hli
Acrylic acid: 0.635 hli -12.7 hli
Cov kua siv lead ua kua polymer: 0.762 mm -3.048 mm
Ntev fiber ntau reinforced yas: 1.905 mm - 27.94 mm
Nylon: 0.762 hli -2.921 hli
Polycarbonate: 1.016 hli - 3.81 hli
Polyester: 0.635 hli -3.175 hli
Polyethylene: 0.762 hli -5.08 hli
Polyphenylene sulfide: 0.508 hli -4.572 hli
Polypropylene: 0.889 hli - 3.81 hli
Polystyrene: 0.889 hli -3.81 hli
Polyurethane: 2.032 hli - 19.05 hli
Tsis tas li ntawd, cov phab ntsa yuav tsum yog tuab tuab. Lub thickness ntawm phab ntsa tsis sib xws tuaj yeem ua rau cov cim indentation. Sinking marks yog qhov kev nyuaj siab hauv zos uas tshwm sim los ntawm kev ua kom txias qeeb ntawm cov khoom tuab. Sim ua kom cov phab ntsa tsis sib xws kom ntau li ntau tau. Txawm li cas los xij, thaum muaj qhov tsis sib xws ntawm phab ntsa thickness, qhov sib txawv thickness yuav tsum tsis pub tshaj 15% ntawm nominal thickness. Peb kuj pom zoo kom siv gradient los yog kev hloov pauv.