Casting Polyurethane Roj Hmab
Casting polyurethane roj hmab yog ib txoj kev nrov siv los ntawm cov tuam ntxhab los tsim cov khoom ruaj khov thiab hloov tau yooj yim. Cov txheej txheem suav nrog kev sib xyaw ua ke ntawm ob cov kua dej, cov polyol thiab isocyanate, ua ke hauv qhov tseeb proportions. Qhov sib tov no yog tom qab ntawd nchuav rau hauv pwm lossis kab noj hniav uas nws yuav tawv thiab kho lub sijhawm.
Txhawm rau kom ua tiav kev ua tiav, nws yog ib qho tseem ceeb uas yuav tsum ua raws li kev tiv thaiv kev nyab xeeb zoo xws li hnav cov hnab looj tes tiv thaiv thiab tsom iav, ua haujlwm hauv qhov chaw muaj cua zoo, thiab ua raws li cov chaw tsim khoom cov lus qhia rau kev tuav cov tshuaj. Cov pwm kuj yuav tsum tau npaj los ntawm kev thov tus neeg sawv cev tso tawm los tiv thaiv cov roj hmab kho kom tsis txhob lo rau saum npoo.
Thaum poured rau hauv pwm, qhov sib tov yuav pib nthuav me ntsis raws li nws kho. Tom qab ob peb teev lossis hnub nyob ntawm cov khoom yuav tsum tau, cov roj hmab casted tuaj yeem raug tshem tawm ntawm cov pwm thiab ua tiav nrog cov kauj ruam ntxiv xws li txiav cov khoom siv ntau dhau los yog ntxiv kev ntxhib los mos. Zuag qhia tag nrho, casting polyurethane roj hmab muab cov tuam txhab tsim txoj hauv kev zoo los tsim cov khoom lag luam zoo nrog ntau theem ntawm hardness thiab yooj rau ntau yam kev lag luam nrog rau cov khoom siv tsheb, cov khoom siv, thiab cov khoom siv kho mob.
Yog tias koj tab tom nrhiav casting polyurethane kev pabcuam tuam txhab, thov hu rau peb xav tias dawb.
Khoom siv thiab khoom siv
Thaum nws los txog rau casting polyurethane roj hmab, cov ntaub ntawv thiab cov khoom siv uas koj siv yog qhov tseem ceeb rau kev ua tiav cov txiaj ntsig zoo. Ua ntej thiab qhov tseem ceeb tshaj plaws, koj yuav xav tau cov pwm ua los ntawm silicone lossis lwm yam khoom tsim nyog los tuav cov kua polyurethane. Tsis tas li ntawd, koj yuav xav tau cov neeg ua haujlwm tso tawm xws li roj av jelly lossis tshuaj tsuag-rau kev daws teeb meem uas tiv thaiv cov roj hmab kho kom tsis txhob lo rau pwm.
Cov khoom tseem ceeb tom ntej yog polyurethane nws tus kheej, uas feem ntau tuaj ntawm ob ntu: resin thiab hardener. Nws yog ib qho tseem ceeb los ntsuas cov khoom no kom raug rau lub sijhawm kho kom zoo thiab lub zog ntawm cov khoom kawg. Nyob ntawm koj qhov kev xav tau hardness lossis qib hloov tau yooj yim, koj tuaj yeem xaiv los ntawm ntau hom polyurethane nrog ntau qhov sib txawv ntawm cov resin-rau-hardener.
Lwm cov ntaub ntawv tseem ceeb suav nrog kev sib xyaw khob, do sticks, hnab looj tes, thiab tsom iav kev nyab xeeb txij li thaum tuav cov kua polyurethane yuav tsum tau ua tib zoo saib xyuas kom tsis txhob muaj tawv nqaij lossis qhov muag puas. Thaum tag nrho cov ntaub ntawv no muaj thiab teeb tsa kom raug raws li cov chaw tsim khoom cov lus qhia, nws yog lub sijhawm los pib casting!
Npaj Pwm
Ua ntej casting polyurethane roj hmab, prepping pwm yog ib qho tseem ceeb kauj ruam uas tsis tuaj yeem hla. Ua ntej, cov pwm yuav tsum huv si thiab tsis muaj cov khib nyiab lossis av. Qhov no tuaj yeem ua tiav los ntawm kev txhuam qhov saum npoo ntawm cov pwm nrog txhuam txhuam kom tshem tawm cov khoom xoob.
Tom ntej no, nws yog ib qho tseem ceeb uas yuav tau siv ib tug tso tawm neeg sawv cev rau pwm nto. Tus neeg sawv cev tso tawm yuav tiv thaiv cov roj hmab polyurethane los ntawm kev ua raws li cov pwm thiab xyuas kom muaj kev tso tawm du ib zaug. Muaj ntau hom kev tso tawm muaj nyob rau hauv kev ua lag luam, xws li tshuaj tsuag lossis kua, thiab xaiv ib qho yog nyob ntawm ntau yam xws li hom resin thiab lub sijhawm kho.
Thaum kawg, nws raug nquahu kom ntxiv cov venting channel nyob rau hauv qhov chaw uas cov hnab tshos cua tuaj yeem tsim thaum kho. Cov kab no tso cai rau cov cua nkag mus rau kev khiav tawm thaum lub sij hawm casting thiab tiv thaiv qhov tsis xws luag hauv cov khoom kawg. Cov pa cua tuaj yeem tsim tau los ntawm kev khawb qhov me me rau hauv qhov chaw uas huab cua tuaj yeem raug daig, xws li cov ces kaum lossis qhov chaw nruj.
Zuag qhia tag nrho, kev npaj koj cov pwm kom zoo ua ntej casting polyurethane roj hmab yog qhov tseem ceeb rau kev ua tiav cov txiaj ntsig zoo thiab ua kom koj cov pwm nyob ntev dua yam tsis muaj kev puas tsuaj.
Sib tov cov roj hmab Compound
Txhawm rau cam khwb cia polyurethane roj hmab, ib tug yuav tsum sib tov ob feem ua kua compound. Thawj ntu yog polyol lossis resin, uas muab cov pob txha polymer. Qhov thib ob yog cov isocyanate lossis hardener reacts nrog polyol los tsim cov khoom polymer. Kev sib xyaw ntawm ob qhov sib xyaw ua ke pib ua cov tshuaj tiv thaiv uas hloov cov kua sib tov rau hauv cov khoom siv elastic thiab ruaj khov.
Cov txheej txheem sib tov yuav tsum yog qhov tseeb raws li nws txiav txim siab cov khoom ntawm cov khoom kawg. Kev sib xyaw tsis txaus tuaj yeem tso cov hnab tsho tsis sib xyaw hauv koj qhov kev ua tiav zaum kawg, ua rau tsis sib xws hauv cov tawv, xim, thiab kev ntxhib los mos. Nws tseem tuaj yeem ua rau ntxov ntxov hnav thiab tsim kua muag ntawm cov khoom siv vim qhov tsis sib xws ntawm kev ntxhov siab thoob plaws hauv koj qhov casting.
Txhawm rau kom ua tiav cov txiaj ntsig zoo thaum sib xyaw, nws yog qhov tseem ceeb uas yuav tsum siv qhov ntsuas kom raug rau ob qho tib si ntawm koj qhov sib xyaw, ua raws li cov chaw tsim khoom cov lus qhia kom ze thiab siv cov cuab yeej kev nyab xeeb zoo xws li hnab looj tes, tsom iav thiab lub tshuab ua pa thaum tuav cov tshuaj no. Thaum koj tau tov koj cov khoom sib xyaw kom huv si, ncuav rau hauv lawv cov pwm tsim sai sai ua ntej lawv pib kho lossis tawv - qhov no ua kom muaj kev sib haum xeeb thoob plaws txhua qhov ntawm koj cov casts.
Pouring & Curing
Pouring thiab curing yog cov kauj ruam tseem ceeb hauv casting polyurethane roj hmab. Ua ntej pib txheej txheem, nws yog ib qho tseem ceeb uas yuav tau npaj cov pwm los ntawm kev ntxuav thiab siv tus neeg sawv cev tso tawm. Thaum pwm npaj txhij, nws yog lub sijhawm los sib tov cov roj hmab polyurethane raws li cov lus qhia ntawm cov chaw tsim khoom. Qhov piv ntawm qhov A thiab B yuav tsum yog qhov tseeb los xyuas kom muaj kev kho kom zoo.
Tom ntej no, maj mam ncuav cov roj hmab sib xyaw polyurethane rau hauv pwm. Nws yog ib qho tseem ceeb kom tsis txhob muab cov npuas npuas thaum lub sij hawm no los ntawm kev nchuav maj mam thiab siv cov kwj nyias ntawm cov sib tov. Tom qab nchuav, maj mam kais los yog vibrate lub pwm los pab kom muaj cov pa npuas uas seem nyob rau saum npoo.
Cov txheej txheem kho tuaj yeem siv sijhawm nyob qhov twg los ntawm ob peb teev mus rau ob peb hnub nyob ntawm qhov xwm txheej xws li kub, av noo, thiab thickness ntawm cov cam khwb cia. Nws yog ib qho tseem ceeb kom tsis txhob cuam tshuam los yog tshem tawm cov casting kom txog thaum nws tau kho tag nrho raws li kev tshem tawm ntxov tuaj yeem ua rau deformation lossis tearing ntawm cov khoom. Thaum kho tag nrho, ua tib zoo tshem koj cov khoom siv roj hmab polyurethane tshiab los ntawm nws cov pwm rau kev siv ntxiv lossis ua tiav kov.
xov nphav
Tom qab nchuav cov polyurethane sib tov rau hauv pwm, nws yog lub sij hawm los tsom mus rau qhov kawg kov uas yuav ua rau koj cov khoom kawg ci. Ib qho ntawm cov kauj ruam tseem ceeb tshaj plaws yog ua tib zoo tshem tawm cov npuas huab cua uas tau tsim thaum lub sij hawm casting txheej txheem. Qhov no tuaj yeem ua tau los ntawm kev maj mam tapping lossis vibrating cov pwm los txhawb kom muaj cov npuas npuas kom nce mus rau saum npoo thiab pop.
Thaum koj tau xyuas kom meej tias tag nrho cov npuas cua tau raug tshem tawm, nws yog lub sijhawm los cia koj cov roj hmab polyurethane kho. Txoj kev kho feem ntau yuav siv sij hawm ob peb teev thiab yuav tsum tsis txhob maj. Nws yog ib qho tseem ceeb uas koj cia koj cov cam khwb cia zaum tsis muaj teeb meem kom txog thaum nws kho tag nrho ua ntej sim tshem tawm ntawm pwm.
Thaum kawg, thaum koj cov cam khwb cia tau kho tag nrho, koj tuaj yeem pib tshem tawm ntawm pwm. Qhov no yuav tsum tau ua tib zoo ua kom tsis txhob ua puas lossis cuam tshuam koj cov khoom kawg hauv txhua txoj kev. Nrog me ntsis kev ua siab ntev thiab saib xyuas kom meej thaum lub sijhawm ua tiav no, koj yuav xaus nrog cov khoom zoo nkauj ua los ntawm polyurethane roj hmab!
xaus
Hauv kev xaus, casting polyurethane roj hmab yuav tsum tau ua tib zoo npaj thiab ua tib zoo saib kom meej. Ua ntej pib txheej txheem casting, nws yog ib qho tseem ceeb uas yuav tsum ntsuas kom zoo thiab sib tov cov khoom ntawm polyurethane resin raws li cov chaw tsim khoom cov lus qhia. Qhov no yuav xyuas kom meej tias cov khoom kawg muaj cov yam ntxwv xav tau thiab cov yam ntxwv.
Thaum cov resin sib tov, nws yuav tsum tau nchuav rau hauv pwm uas tau npaj kom zoo nrog tus neeg tso tawm. Tom qab ntawd cov pwm yuav tsum tau tso tseg tsis muaj kev cuam tshuam rau ob peb teev kom cov resin kho tau tag nrho. Tom qab kho, cov khoom siv ntau dhau tuaj yeem txiav tawm thiab cov khoom tiav tuaj yeem raug tshem tawm ntawm pwm.
Zuag qhia tag nrho, casting polyurethane roj hmab tuaj yeem yog qhov nyuaj tab sis muaj txiaj ntsig zoo rau cov neeg uas txaus siab muab sijhawm thiab siv zog xav tau. Nrog cov txheej txheem tsim nyog thiab ua tib zoo saib xyuas kom meej, nws muaj peev xwm tsim cov castings zoo uas ua tau raws li koj cov kev xav tau tshwj xeeb thiab cov kev xav tau.
