Hol prɛshɔn ɛn tɛm — tu wɔd dɛn we ol di pawa fɔ mek ɔ brok yu injɛkshɔn-mɔld pat dɛn. Tink bɔt am lɛk di mek-ap ɛgzam usay di matirial gɛt in las gred. Get it right, en yu don get yusef wan part we don redi fo di runway. Get it wrong, ɛn i dɔn go bak to di drɔin bɔd. Tide, lɛ wi tɔk bɔt fɔ masta dis impɔtant step we de tɔn plastic frɔm ziro to hiro.
Ɔndastand di injɛkshɔn prɔses .
Di injɛkshɔn saykl na:
1.Fil step: initial kaviti filin (95-98%)
2.Pack Step : Kɔmpɛns fɔ Shrinkage
3.Hol step : Mentɛn prɛshɔn te get friz
Wan stכdi na di intanεshכnal polimכr prכsεsin jכnal fכnכt se fכ optimiz dεn stεp dεm ya kin ridyus saykl tεm bay 12% we i de mεnten pat kwaliti.
Impɔtant fɔ optimiz pak ɛn ol tɛm .
Ivin smɔl tɛm sevings kɔmpawnd. Bay optimayzeshɔn, wi go gɛt:
1.5 sɛkɔn dɛn we dɛn dɔn sev fɔ ɛni saykl .
300,000 pat dɛn we dɛn kin mek ɛvri ia
Rizult in 125 awa prodakshɔn tɛm we dɛn sev fɔ wan ia .
Pat kwaliti rijɛkt ret bin go dɔŋ bay 22%
Material efficiency inkri bay 5% .
Oval prodakshɔn kɔst dɛn we dɛn ridyus bay 8% .
Di prɛshɔn we de ol .
Wetin de ol prɛshɔn insay injɛkshɔn moldin .
Hכl prεshכn na di fכs we dεn aplay to di mכlt plastic afta di mold kכva dεn dכn fulכp. I de du sɔm impɔtant tin dɛn:
1.Kɔmpɛns fɔ matirial shrinkage as di pat de kol .
2.I de mek shɔ se di rayt pat pan di pat ɛn di dimɛnshɔnal akkuracy .
3.I de mek yu nɔ gɛt prɔblɛm dɛn lɛk sink mak ɛn voyd .
Tipikli, di prɛshɔn we dɛn kin gɛt kin smɔl pas di fɔs injɛkshɔn prɛshɔn, we kin kɔmɔt frɔm 30-80% pan di injɛkshɔn prɛshɔn, i kin dipen pan di matirial ɛn di pat dizayn.
Transishɔn Point .
Di transishɔn pɔynt de mak di krichɔl junkshɔn bitwin injɛkshɔn ɛn ol faz. Risach frɔm di Yunivasiti ɔf Masachusɛt Lɔɛl sho se di prɛsis transishɔn pɔynt kɔntrol kin ridyus di pat we di wet kin chenj bay we i rich 40%.
Na dis wan na wan mɔ ditayla brekdɔwn fɔ transishɔn pɔynt dɛn:
| Prodakt tayp | tipik transishɔn pɔynt | not dɛn |
| Advays | 95% fulɔp . | I fayn fɔ bɔku pan di aplikeshɔn dɛn . |
| Tin-wɔl . | 98% pipul dɛn dɔn ful-ɔp . | I de mek shɔt shɔt shot dɛn nɔ apin . |
| Nɔ balans we nɔ balans . | 70-80% ful-ɔp | Kɔmpɛns fɔ flɔ imbalans . |
| tik-wɔl . | 90-92% ful-ɔp | I nɔ de mek pɔsin pak pasmak . |
Transishɔn pɔynt dɛn kin difrɛn bad bad wan bay we dɛn yuz pat jɔyometri ɛn matirial kwaliti dɛn. Standart prodakt dɛn kin bɛnifit frɔm wan fil we dɔn nia fɔ kɔmplit bifo dɛn chenj. Tin-wɔl tin dɛn nid fɔ gɛt ɔlmost ful kaviti filin fɔ mek shɔ se dɛn mek di rayt pat. Di dizayn dɛn we nɔ balans nid fɔ chenj bifo tɛm fɔ manej flɔ diskrɛpshɔn. Tik-wɔl kɔmpɔnɛnt dɛn kin chenj bifo tɛm fɔ avɔyd fɔ pak pasmak. Risεnt simulεshכn softwεa advansmεnt dεm alaw fכ prεsis prεdikshכn כf optimal transishכn pכynt dεm, ridyus setup tεm εn mεtirial west.
Impekt fɔ ol prɛshɔn pan mold pat dɛn .
Efεkt dεm we di prεshכn we de low low de gi .
If yu nɔ gɛt bɛtɛ prɛshɔn, dat kin mek yu gɛt bɔku bɔku prɔblɛm dɛn. Wan stɔdi we dɛn bin du insay 2022 we dɛn bin du na di Intanɛshɔnal Jɔnal fɔ Prɛsishɔn Ɛnjinia ɛn Manufakchurin bin sho se pat dɛn we dɛn mek wit prɛshɔn we nɔ fayn sho se:
15% inkris na sink mak dip .
8% ridyushɔn pan pat wet .
12% dikɛshɔn pan tɛnsiɛl trɛnk .
Dɛn difrɛn difrɛn tin dɛn ya kɔmɔt frɔm di kɔmpreshɔn we nɔ fayn fɔ di plastic mɛlt na di mold kaviti, we de sho di impɔtant tin dɛn we di prɔpa prɛshɔn sɛtin dɛn gɛt.
Efεkt dεm we di hכy hכl prεshכn de gi .
Conversely, pasmak prɛshɔn nɔto di ansa. Ova-prɛshɔn kin rilizɔt insay:
Up to 25% inkris in intanal strɛs .
10-15% ay risk fɔ mek dɛn wɛr di mold bifo tɛm we dɛn dɔn bɔn .
5-8% Inkris pan ɛnaji kɔnsɔmshɔn .
Di ay prɛshɔn fɔs dɛn tumɔs plastic insay di mol, we de mek dɛn prɔblɛm ya ɛn we kin mek di mold nɔ gɛt layf igen.
Optimal hold prɛshɔn .
Di ideal holdin prɛshɔn de strik wan dilikɛt balans. Wan kɔmprɛhɛnsif stɔdi we di Plastik Indastri Asɛmbli bin du sho se di prɛshɔn we dɛn dɔn mek we dɛn dɔn ɔptimayz kin:
Ridyus di skrap ret bay 30% .
Impruv dimɛnshɔnal akkuracy bay 15-20%
Ekstend mold layf bay 10-15%
Difrɛn matirial dɛn nid fɔ gɛt difrɛn prɛshɔn we dɛn de ol. Na dis na wan tebul we dɛn dɔn ɛkspanda bays pan di standad dɛn we di industri gɛt:
| di tin dɛn | we dɛn dɔn advays fɔ mek dɛn ol prɛshɔn | Speshal tin dɛn fɔ tink bɔt |
| PA (naylɔn) . | 50% pan di injɛkshɔn prɛshɔn . | Moisture-sensitive, kin nid fɔ pri-dray . |
| Pom (Asɛtal) . | 80-100% fɔ injɛkshɔn prɛshɔn . | ay prɛshɔn fɔ impɔtant dimɛnshɔnal stebiliti . |
| PP/PE we de na di . | 30-50% ɔf injɛkshɔn prɛshɔn . | Lower prɛshɔn bikɔs ɔf di ay shrinkage rates . |
| ABS na ABS | 40-60% ɔf injɛkshɔn prɛshɔn . | balans fɔ gud sɔfays finish . |
| PC . | 60-80% ɔf injɛkshɔn prɛshɔn . | prɛshɔn we ay fɔ mek dɛn nɔ gɛt sink mak dɛn . |
Matirial prɔpati dɛn signifyant inflɔws ɔptimal holdin prɛshɔn sɛtin dɛn. Naylon, bikɔs na hygroscopic, bɔku tɛm i kin nid prɛ-dray ɛn mɔdaret prɛshɔn. Asetal bɛnifit frɔm ay prɛshɔn fɔ ajɔst tayt tolɛreshɔn. Polyolefins lek PP en PE nid low preshos bicos of dem high shrinkage rates. ABS de strik wan balans, we polycarbonate nid ay prɛshɔn fɔ mek di surface kwaliti kɔntinyu fɔ de. Di kɔmpɔzit matirial dɛn we de kam ɔp de push di bɔda dɛn fɔ tradishɔnal holdin prɛshɔn rɛnj, we nid fɔ kɔntinyu fɔ du risach ɛn divɛlɔpmɛnt insay prɔses ɔptimayzeshɔn.
Step fɔ sɛt prɛshɔn we yu fɔ ol .
Fɔ mek di kɔrɛkt prɛshɔn we dɛn de kip na impɔtant tin fɔ mek dɛn prodyuz ay kwaliti injɛkshɔn mold pat dɛn. Fɔ fala dɛn step ya fɔ mek yu wok fayn fayn wan:
Ditarmin di Minimum Prɛshɔn .
Start wit wan low holding pressure, smɔl smɔl i de inkrisayz am .
Monitor pat kwaliti, luk fɔ sayn dɛm fɔ ɔndafilling
Di minim prɛshɔn de rich we dɛn kin ful-ɔp di pat dɛn ɔltɛm .
Dis step de mek shɔt shot ɛn mek shɔ se kɔmplit pat fɔmɛshɔn .
Fɛn maksimam prɛshɔn .
Inkrimɛntli rayz di holdin prɛshɔn pas di minimum .
Obshɔb pat edj ɛn pat layn fɔ flash fɔmɛshɔn .
Di maksimal prɛshɔn na jɔs dɔŋ di say we flash de apin .
Dis step de sho di ɔpa limit fɔ yu prɛshɔn rɛnj .
Set di prɛshɔn we de ol bitwin dɛn valyu ya .
Kalkul di midpoint bitwin di minimum ɛn di maksimal prɛshɔn dɛn .
Yuz dis as yu fɔs hold prɛshɔn sɛtin .
Fayn-tyun bays pan pat kwaliti ɛn spɛshal matirial kwaliti dɛn .
Adjɔst insay dis rɛnj fɔ ɔptimayz pat dimɛnshɔn ɛn sɔfays finish .
Matirial prɔpati dɛn signifyant inflɔws ɔptimal sɛtin dɛn. fכ egzampl, sεmi-kristalin polimכr dεm kin nid fכ hכy hכl prεshכn pas di wan dεm we de fכm.
| Material type | typical holding prɛshɔn rɛnj . |
| Semi-kristalayn . | 60-80% ɔf injɛkshɔn prɛshɔn . |
| Amorphous . | 40-60% ɔf injɛkshɔn prɛshɔn . |
Pro tip: Yuz prɛshɔn sɛnsɔn dɛn na yu mold kaviti fɔ rial-taym monitarin. Dɛn de gi valyu data fɔ prɛsis prɛshɔn kɔntrol ɔlsay na di injɛkshɔn ɛn holdin faz.
Multistage injekshɔn ɛn prɛshɔn we de ol .
Multistage prɔses dɛn de gi fayn fayn kɔntrol. Risach frɔm di Journal of Applied Polymer Science sho se multistage holding kin:
Ridyus di wɔpej bay te to 30% .
Minimayz intanɛnt strɛs bay 15-20% .
Lɔwa ɛnaji kɔnsɔmshɔn bay 5-8% .
Na dis na wan tipik multistage holdin prɛshɔn profayl:
| stej | prɛshɔn (% ɔf maks) | durayshɔn (% ɔf di ɔl hold tɛm) | pɔpɔshɔn |
| 1 | 80-100% | 40-50% | Initial Pakin . |
| 2 | 60-80% | 30-40% | Controlling Cooling . |
| 3 | 40-60% | 20-30% | Faynal dimɛnshɔnal kɔntrol . |
Dis multistage aprɔch alaw fɔ prɛsis kɔntrol ɔlsay na di holdin faz. Di fɔs ay-prɛshɔn stej de mek shɔ se dɛn pak fayn fayn wan, we de ridyus di risk fɔ sink mak ɛn voyd. di intamεdiεt stej de mεnεj di kכl prכsεs, i de minimiz intanεt strεs dεm. Di fainal stej fayn-tyun dimenshon as di pat solidifies. Advans moldin mashin naw de ofa dinamik preshos profayl, adjus in rial-taym bays pan sensa fidbak, further optimizing di proses f komplex joyometri en materials.
Holding tɛm .
Wetin de ol tɛm insay injɛkshɔn moldin .
Holding taim na di duration we di holdin preshos de aplay. I bigin afta di kaviti ful-ɔp ɛn kɔntinyu te di get (di say we dɛn de go insay di mold kaviti) friz.
Di men tin dɛn bɔt di tɛm we dɛn fɔ ol na:
1.I de alaw ɔda matirial fɔ ɛnta di mold fɔ kɔmpɛns fɔ shrinkage .
2.Typically de frɔm 3 to 10 sɛkɔn fɔ bɔku pat dɛn
3.Varies bays pan pat tiknes, matirial prɔpati, ɛn mold tɛmpracha Di optimal holding tɛm de mek shɔ se di get dɔn kɔmplit wan frɔzɛn, we de mek matirial bakflɔ we i de avɔyd pasmak intanɛnt strɛs ɔ get protrushɔn.
Impact of holding time pan molded parts .
Efεkt dεm we insufisεnt hכld tεm de gi .
If yu nɔ gɛt bɛtɛ tɛm fɔ ol yu, dat kin mek yu gɛt:
Up to 5% vεryushכn na pat wet .
10-15% Inkris in intanɛnt void fɔmɛshɔn .
7-10% ridyushɔn pan dimɛnshɔnal akkuracy .
Efεkt dεm we pasmak hכld tεm .
Pan ɔl we i go tan lɛk se fɔ lɔng tɛm bɛtɛ, fɔ lɔng tɛm fɔ ol am gɛt in bad tin dɛn:
3-5% Inkris in Saykl Taym pan sɛkɔn fɔ ɛksɛs holdin .
I go rich 8% ay ɛnaji kɔnsɔmshɔn .
2-3% inkris na di rεsidyual strεs lεvεl dεm .
Klasik step fɔ sɛt di tɛm we dɛn fɔ ol .
Set Tempracha we de mɛlt .
Kɔnsul yu matirial datasheet fɔ di tɛmpracha rɛnj dɛn we dɛn dɔn rɛkɔmɛnd .
Pik wan mid-rɛnj valyu as yu statin pɔynt
Dis de mek shɔ se dɛn gɛt di rayt matirial viskɔsiti fɔ di moldin prɔses .
Adjɔst di ki paramita dɛn .
Fayn-tyun filin spid fɔ ajɔst balans kaviti filin
Set transishɔn pɔynt, tipikli na 95-98% kaviti fil
Ditarmin aprɔpriet kol tɛm bays pan pat tiknes .
Set prɛshɔn we de ol .
Test difrɛn tɛm dɛn we dɛn kin kip .
Start wit shɔt tɛm fɔ ol, smɔl smɔl i de mek i go ɔp smɔl smɔl .
Prodyuz 5-10 pat pan ɛni tɛm sɛtin .
Wej ɛni pat yuz prɛsishɔn skel (±0.01g akkuracy)
Krio wan wet vs. tɛm plot .
Identify weit stebilizayshɔn pɔynt .
Finaliz Holding Taym .
Ad 0.5-2 sekond to di stebilizayshɔn pɔynt
Dis ekstra tɛm de mek shɔ se kɔmplit get friz .
Adjɔst bays pan pat kɔmplisiti ɛn matirial kwaliti dɛn .
Pro tip: Fɔ kɔmpleks pat dɛn, tink bɔt fɔ yuz kaviti prɛshɔn sɛns. Dɛn de gi dairekt fidbak pan get friz, alaw fɔ mɔ prɛsis holdin tɛm ɔptimayzeshɔn.
Kɔnkliushɔn: Masta fɔ ol prɛshɔn ɛn tɛm insay injɛkshɔn moldin
Di optimayzeshɔn fɔ ol prɛshɔn ɛn tɛm tinap as kɔna ston na di pursyu fɔ ay-kwaliti injɛkshɔn mold pat dɛn. Dɛn paramita ya, we dɛn kin ɔverluk bɔku tɛm, de ple wan impɔtant pat fɔ no di fayn fayn prɔdak in dimɛnshɔnal akkuracy, sɔfays finish, ɛn ɔvala intɛgriti.As injɛkshɔn moldin teknɔlɔji de kɔntinyu fɔ evolv, di impɔtants fɔ fayn-tyunin holdin prɛshɔn ɛn tɛm de kɔntinyu fɔ de kɔnstant. Bay we dɛn sabi dɛn paramita ya, di wan dɛn we de mek di tin dɛn kin ebul fɔ ajɔst di dilik balans bitwin di pat kwaliti, di prodakshɔn efyushɔn, ɛn di kɔst-ɛfɛktiv.
Mɛmba se, pan ɔl we di jenɛral gaydlayn dɛn de gi wan say fɔ bigin, ɛni molding sɛnɛriɔ na wan kayn we. Kɔntinyu fɔ wach, tɛst, ɛn ajɔst na di men tin fɔ mek dɛn kɔntinyu fɔ wok fayn fayn wan na di dinamik wɔl fɔ injɛkshɔn moldin.
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FAQS bɔt fɔ ol prɛshɔn ɛn tɛm .
1. Wetin de ol prɛshɔn insay injɛkshɔn moldin?
Hold prɛshɔn na di fɔs we dɛn aplay afta di mold kaviti fil. I de mentɛn di pat in shep we i de kol, i de mek i nɔ gɛt prɔblɛm lɛk sink mak ɛn voyd.
2. Aw fɔ ol tɛm difrɛn frɔm di tɛm we dɛn kin kol?
Holding time na di duration pressure we dɛn kin aplay afta dɛn dɔn ful. Di tɛm fɔ kol na di ɔl tɛm we di pat de kɔntinyu fɔ de na di mol fɔ mek i strɔng. di tεm we dεn de hכl kin sכt sכt εn i kin apin insay di tεm we dεn de kol.
3. Yu tink se fɔ mek di prɛshɔn we de go ɔp kin mek di pat kwaliti bɛtɛ ɔltɛm?
Nɔ, pan ɔl we di prɛshɔn we de na di wɔl fayn fayn wan na impɔtant tin, di prɛshɔn we de pasmak kin mek prɔblɛm dɛn lɛk wɔpej, flash, ɛn mɔ strɛs we de insay. Optimal prɛshɔn kin difrɛn bay matirial ɛn pat dizayn.
4. Aw a go no di rayt tɛm fɔ ol?
Kɔndɔkt di tɛst dɛn we dɛn kin du wit di wet:
Mold pat dɛn wit di tɛm we dɛn kin ol .
wej ɛni pat pan di pat .
Plot weit vs. Hold taim .
Identify usay wet de stebul .
Set tɛm smɔl fɔ lɔng pas dis pɔynt .
5. Wetin na di rilayshɔn bitwin pat tik ɛn fɔ ol prɛshɔn/tɛm?
Di pat dɛn we tik pas ɔl kin nid:
Bɔku tɛm, pat pan di pat dɛn we gɛt tin dɛn kin nid ay prɛshɔn ɛn shɔt tɛm.
6. Aw di tin dɛn we pɔsin kin pik fɔ du sɔntin kin afɛkt di prɛshɔn sɛtin dɛn we dɛn kin gɛt?
Difrɛn matirial dɛn gɛt difrɛn shrinkage ret ɛn viskɔsiti. Fɔ ɛgzampul:
Naylon: ~50% pan injɛkshɔn prɛshɔn .
Asetal: 80-100% pan di injεkshכn prεshכn .
PP/PE: 30-50% pan injɛkshɔn prɛshɔn
Ɔltɛm, luk na matirial datasheet fɔ gayd.
7. Wetin na di sayn dɛm fɔ se dɛn nɔ gɛt bɛtɛ prɛshɔn ɔ tɛm?
Di kɔmɔn tin dɛn we dɛn kin tɔk bɔt na:
