Plastic forming and processing yog hais txog kev tsim cov khoom yas. Hauv kev ua cov yas, cov khoom yog tsim los ntawm kev ua thiab kev tsim cov yas semi-cov khoom tiav, molded qhov chaw, films, los yog yas fibers. Cov ntaub ntawv yas raw khoom feem ntau yog muab rau hauv daim ntawv granules, hmoov, nplooj ntawv, lossis zaj duab xis.
Thaum lub sij hawm ua, plastics nyob rau hauv granular los yog hmoov daim ntawv yog feem ntau rhuab thiab raug rau casting, txau, calendering, extrusion, nias, tshuab molding, los yog foaming. Yog li ntawd, cov txheej txheem tsim tshwj xeeb yog qhov tseem ceeb hauv kev ua cov yas. Tsis tas li ntawd, yog tias cov khoom ntxiv tau muab tso rau hauv cov yas kom ua tiav lossis txhim kho cov khoom tshwj xeeb, nws raug xa mus rau kev sib xyaw.
Ntau txoj kev ua cov yas
Raws li tau hais los saum no, cov txheej txheem tsim yog qhov tseem ceeb hauv kev tsim khoom yas. Muaj ntau txoj hauv kev uas yuav tsum tau paub qhov txawv. Qee cov txheej txheem tseem ceeb tau piav qhia hauv qab no:
Extrusion
Thaum lub sij hawm extrusion txheej txheem, yas yog pub rau hauv lub chim qhov twg cov ntsia hlau ua hauj lwm los ntawm ib tug hopper, thiab qhov no yog ib tug extruder. Lub suab ntawm ntau ntu ntawm cov ntsia hlau sib txawv. Lawv feem ntau siv rau melting, homogenizing, venting, thiab compression. Extruders tuaj yeem siv rau ntau yam. Lawv tuaj yeem siv los tsim cov granules, rov siv cov yas, thiab tsim cov ntawv, cov ntawv txheeb, textile fibers, thiab zaj duab xis. Hauv kev tsim cov yeeb yaj kiab, lub extruder yog nruab nrog lub qhov tuag thiab / lossis siv ua ke nrog lub calender. Yog hais tias nws yog ib tug multilayer zaj duab xis, ob peb extruders feem ntau yuav tsum tau ib txhij tsim cov khoom ua yeeb yaj kiab.
Rolling
Calendering yog cov txheej txheem tsim cov yas uas yuav tsum tau muaj cov txheej txheem ntawm cov chais los ua kom tiav lossis flatten cov ntawv yas. Nws yog feem ntau siv rau hauv kev tsim cov yeeb yaj kiab, daim hlau nyias, thiab cov ntaub ntawv hauv pem teb.
Kev sib hloov molding
Rotational molding yog txheej txheem tsim tshwj xeeb siv los tsim cov khoom loj, hollow, seamless yas. Thaum lub sij hawm tsim cov txheej txheem, melted yas hais yog tso rau ntawm lub puab nto ntawm rotational molding pwm thaum lawv txias. Vim yog cov yam ntxwv ntawm kev sib hloov molding pwm, cov phab ntsa sib txawv tuaj yeem ua tiav txawm tias nyob hauv ib qho pwm.
Ua npuas ncauj
Foaming tuaj yeem muab faib ua peb pawg. Nyob rau hauv tshuaj foaming, cov roj uas ua rau cov khoom ua npuas ncauj yog tso tawm thaum lub sij hawm polymerization txheej txheem. Nyob rau hauv lub cev foaming, ib tug tsawg - boiling kua yog ntxiv rau cov tshuaj tiv thaiv sib tov, uas evaporates thaum lub sij hawm cov txheej txheem polymerization, yog li tsim npuas. Thaum kawg, nyob rau hauv mechanical foaming, roj yog txhaj rau hauv cov yas yaj thaum nplawm.
Txhaj tshuaj molding tshuab
Hauv tshuab molding, lub thermoplastic preform nthuav dav hauv pwm. Cov cua compressed ua rau nws ua raws li cov pwm sab hauv thiab tuav nws hauv qhov chaw thaum nws txias. Cov txheej txheem no feem ntau yog siv los tsim cov khoom xws li lub raj mis, thoob, thiab tsheb roj tso tsheb hlau luam.
Kev txhaj tshuaj molding yog dab tsi?
Txawm li cas los xij, kev txhaj tshuaj molding yog thawj thiab feem ntau siv cov txheej txheem hauv kev ua cov yas. Nws yog cov txheej txheem tsim khoom zoo heev, tshwj xeeb tshaj yog haum rau kev tsim khoom loj. Feem ntau, txhua qhov loj - cov khoom tsim los ntawm iav, roj hmab, hlau, lossis yas yog tsim los ntawm kev txhaj tshuaj molding. Cov txheej txheem yog ncaj nraim: cov yas yaj yog txhaj rau hauv pwm, tso cai rau txias, thiab tom qab ntawd cov khoom yas raug tshem tawm. Nws muaj plaub theem: pwm clamping, txhaj tshuaj, txias, thiab ejection.
Raws li lub caij txias nyob rau lub sijhawm feem ntau, nws kuj tseem ua haujlwm ua lub zog txhawm rau txhim kho kev tsim khoom. Qhov no yog riam phom zais cia ntawm kev txhaj tshuaj molding: tooj liab! Vim nws cov khoom tshwj xeeb, tooj liab-raws li alloys xws li txhuas bronze los yog beryllium bronze tuaj yeem ua rau lub sijhawm luv luv, txhawb kev tsim khoom ntau txog 80%! Qhov no tuaj yeem txuag cov tuam txhab 10-40% ntawm cov nqi tsim khoom.
Yog li ntawd, txo lub sij hawm voj voog tsuas yog ib qho ntawm cov laj thawj rau kev txuag nyiaj hauv txhuas bronze. Lwm cov laj thawj suav nrog txo tus nqi ntawm qhov tsis xws luag. Tsis tas li ntawd, qhov zoo tshaj plaws thermal conductivity ntawm tooj liab-raws li alloys tuaj yeem txo qis warping thiab deformation. Qhov no yog vim qhov zoo ntawm kev ua kom txias txias, vim cov pwm ua los ntawm txhuas bronze faib cov cua sov ntau dua li cov pwm hlau.
