Shrinkage qhov chaw ntawm kev txhaj tshuaj molding txheej txheem

Cov yam ntxwv cuam tshuam rau shrinkage ntawm thermoplastics yog raws li nram no:

1. Yas hom:

Thaum lub sij hawm molding txheej txheem ntawmthermoplastics, tseem muaj qee yam xws li lub ntim hloov vim crystallization, muaj zog sab hauv kev ntxhov siab, loj residual kev ntxhov siab khov rau hauv cov yas, muaj zog molecular orientation, thiab lwm yam, yog li muab piv nrog thermosetting plastics, tus nqi shrinkage loj dua, tus nqi shrinkage. ntau yam yog dav, thiab cov directivity yog pom tseeb.Tsis tas li ntawd, qhov shrinkage tus nqi tom qab molding sab nraud, annealing los yog humidity txias kev kho mob yog feem ntau loj dua li ntawm thermosetting plastics.

2. Yas ib feem yam ntxwv:

Thaum cov khoom molten hu rau saum npoo ntawm pwm kab noj hniav, txheej txheej tam sim ntawd txias kom tsim ib lub plhaub uas tsis muaj qhov ntom ntom.Vim yog cov neeg txom nyem thermal conductivity ntawm cov yas, cov txheej hauv cov yas txias maj mam los ua cov txheej txheem siab nrog cov pob zeb loj.Yog li ntawd, cov neeg uas muaj phab ntsa thickness, qeeb txias thiab high-density txheej thickness yuav shrink ntau.Tsis tas li ntawd, muaj cov txheej txheem thiab cov txheej txheem thiab kom muaj nuj nqis cuam tshuam rau cov khoom ntws, ceev cov faib khoom thiab kev faib tawm ntawm cov khoom lag luam.Yog li ntawd, cov yam ntxwv ntawm cov khoom yas muaj kev cuam tshuam ntau dua ntawm qhov shrinkage loj thiab kev taw qhia.

3. Pub inlet hom, qhov loj me thiab kev faib tawm:

Cov xwm txheej ncaj qha cuam tshuam rau cov kev taw qhia ntawm cov khoom ntws, ntom sprision, siab tuav thiab pub cov nyhuv thiab siv lub sijhawm siv pwm.Cov khoom noj ncaj qha thiab cov khoom noj nkag nrog cov ntu loj (tshwj xeeb yog ntu tuab) muaj qhov me me tab sis muaj kev ncaj qha loj, thaum pub nkag nrog luv dav thiab ntev muaj me me directivity.Cov neeg uas nyob ze rau qhov pub nkag los yog sib npaug rau cov kev taw qhia ntawm cov khoom ntws yuav muaj qhov loj me me.

4. Tsim cov xwm txheej:

Cov pwm kub yog siab, cov khoom molten txias maj mam, qhov ceev yog siab, thiab shrinkage yog loj.Tshwj xeeb tshaj yog rau cov khoom siv crystalline, lub shrinkage yog loj dua vim yog lub siab crystallinity thiab loj ntim hloov.Lub puab tsaig ntsuas kub kuj cuam tshuam nrog sab hauv thiab sab nraud txias thiab qhov tsis txaus ntseeg ntawm cov yas thiab kev taw qhia ntawm cov chaw shrinkage ntawm txhua feem.

Thaumpwm tsim, tus nqi shrinkage ntawm txhua feem ntawm cov yas yuav tsum raug txiav txim raws li kev paub raws li qhov shrinkage ntau yam ntawm cov yas, cov phab ntsa thickness thiab cov duab ntawm cov yas, daim ntawv, qhov loj me thiab kev faib tawm ntawm cov khoom noj, thiab tom qab ntawd kab noj hniav loj yuav tsum xam.

Rau high-precision yas qhov chaw thiab thaum nws yog ib qho nyuaj rau tus tswv lub shrinkage tus nqi, cov hauv qab no yuav tsum tau siv feem ntau los tsim pwm:

① Sab nraud ntawm cov khoom yas yuav tsum muaj qhov me me me me, thiab lub taub sab hauv yuav tsum muaj qhov loj me me, thiaj li tawm hauv chav rau kev kho tom qab kuaj pwm.

② Kev kuaj pwm txiav txim siab daim ntawv, qhov loj me thiab pwm pwm ntawm lub qhov rooj.

③ Cov khoom yas yuav tsum tau kho tom qab yuav tsum tau kho tom qab txiav txim siab qhov hloov pauv loj (qhov ntsuas yuav tsum tau ua 24 teev tom qab demoulding).

④ Kho cov pwm raws li qhov tseeb shrinkage.

⑤ Sim cov pwm dua thiab hloov kho tus nqi shrinkage me ntsis los ntawm kev hloov cov txheej txheem kom tsim nyog kom tau raws li qhov yuav tsum tau ua ntawm cov yas yas.