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Hukama huri pakati pejekiseni mold cavity size uye plastiki shrinkage

Time: 2021-06-30 Hits: 439

Thermoplastics inoratidzirwa nekuwedzera mushure mekupisa uye kubvongodza mushure mekutonhora. Ehe, vhoriyamu inoderera mushure mekumanikidza. Mukuita jekiseni rekuumba, purasitiki yakanyungudutswa inotanga kubaiwa mugomba rekuumbwa. Mushure mokunge kuzadza kwapera, zvinhu zvakanyungudutswa zvinotonhora uye zvinosimbisa. Kana chikamu chepurasitiki chikabviswa mu mold, shrinkage inoitika. Kudzinyana uku kunonzi kuumba shrinkage. Munguva kubva panguva iyo mold inotorwa kuti igadzikane chikamu chepurasitiki, pachange paine shanduko shoma muhukuru. Imwe shanduko ndeyekuramba uchidzikira. Kudzikira uku kunonzi post-shrinkage.

 kupera kwepurasitiki

Imwe shanduko ndeyekuti mamwe mapurasitiki ehygroscopic anozvimba nekuda kwekutorwa kwemwando. Semuenzaniso, kana mvura yenylon 610 iine 3%, kuwedzera kwekukura kuri 2%; apo mvura yegirazi fiber yakasimbiswa naironi 66 iri 40%, kukura kwekukura kuri 0.3%. Asi basa guru nderekugadzira shrinkage.

Parizvino, nzira yekuona shrinkage rate yemapurasitiki akasiyana-siyana (kuumba shrinkage + post shrinkage) inowanzokurudzira zviga zveDIN16901 muGermany yenyika. Kureva, musiyano pakati pehukuru hwegomba remuvhu pa23 ° C± 0.1 ° C uye saizi yechikamu chepurasitiki chinoyerwa patembiricha ye23 ° C uye hunyoro hwe50 ± 5% mushure mekuiswa kwe24. maawa mushure mekugadzira inoverengwa.

 

Kuderera kwechiyero S kunoratidzwa neinotevera fomula: S={(D-M)/D}×100%(1)

Pakati pavo: S-shrinkage rate; D-mold size; M-plastiki chikamu saizi.

Kana mhango yeforoma ikaverengerwa zvichienderana nesaizi yeplastic chikamu uye shrinkage rate yemidziyo, iri D=M/(1-S). Kuti kurerutsa kuverenga mukugadzira mold, iyi inotevera fomula inowanzo shandiswa kutsvaga saizi ye mold:

 

D=M+MS(2)

 

Kana pachidiwa kuverenga kwakaringana, nzira inotevera ichashandiswa: D=M+MS+MS2(3)

 

Zvisinei, pakusarudza shrinkage rate, nokuti iyo chaiyo shrinkage rate inobatwa nezvinhu zvakawanda, maitiro akaenzana chete anogona kushandiswa. Naizvozvo, kuverengerwa kwehukuru hwegomba neformula (2) kunoenderana nezvinodiwa. Paunenge uchigadzira mold, mhango inogadziriswa maererano nekutsauka kwepasi, uye nheyo inogadziriswa maererano nekutsauka kwepamusoro, kuitira kuti inogona kunyatsogadziriswa kana zvichidiwa.

Chikonzero chikuru nei zvakaoma kunyatsoona shrinkage rate ndeyekutanga nekuti shrinkage rate yemapurasitiki akasiyana-siyana haisi iyo yakagadziriswa kukosha, asi huwandu. Nekuti shrinkage rate yechinhu chimwe chete chinogadzirwa mumafekitori akasiyana haina kufanana, kunyangwe shrinkage rate yechinhu chimwe chete nenhamba dzakasiyana dzebatch dzinogadzirwa mufekitori imwe dzakasiyana.

Naizvozvo, fekitori yega yega inogona kungopa vashandisi iyo shrinkage rate renji yepurasitiki inogadzirwa nefekitori. Kechipiri, iyo chaiyo shrinkage panguva yekugadzira maitiro inobatwawo nezvinhu zvakaita sechimiro chechikamu chepurasitiki, chimiro chekuumbwa uye kuumba mamiriro.

 

Plastic chikamu chimiro

 

Kune ukobvu hwemadziro echikamu chakaumbwa, nguva yekutonhora yemadziro gobvu kazhinji yakareba, saka shrinkage rate zvakare yakakura. Kune zvikamu zvepurasitiki zvakajairwa, kana saizi yekunyungudika kuyerera kwekutungamira L kwakasiyana nesaizi perpendicular kune yekunyunguduka kuyerera nzira W, mutsauko mukuputsika wakakurawo. Kubva pakuona kwekunyunguduka kuyerera kureba, kurasikirwa kwekumanikidzwa kwechikamu kure negedhi kwakakura, saka shrinkage rate panguva ino yakakurawo kupfuura yegedhi riri pedyo. Nekuti zvimiro zvakaita sembabvu, maburi, maboss, uye kuvezwa zvine shrinkage resistance, kuwanda kwezvikamu izvi kudiki.

 

Chimiro chemarara

 

Mhando yegedhi inewo mhedzisiro pane shrinkage rate. Paunenge uchishandisa gedhi duku, shrinkage rate yechikamu chepurasitiki inowedzera nokuti gedhi rinosimbisa kusati kwapera kwekubata. Iyo inotonhorera yedunhu chimiro mune jekiseni mold zvakare kiyi mukugadzira mold. Dhizaini isina kufanira yedunhu rekutonhora inokonzeresa kushomeka kwakashata nekuda kwekushisa kusina kuenzana mukati mezvikamu zvepurasitiki, izvo zvinozokonzera kunze kwekushivirira kana deformation yezvikamu zvepurasitiki. Muchikamu chakatetepa-chakakomberedzwa, pesvedzero yekugovera tembiricha yekuumbwa pa shrinkage iri pachena.

 

Mold size uye kushivirira kwekugadzira

 

Pamusoro pekuverenga zviyero zvekutanga zve mold cavity uye musimboti kuburikidza neformula D = M (1 + S), pane zvakare dambudziko remachining kushivirira. Nechibvumirano, kushivirira kwekugadzira kwe mold ndeye 1/3 yekushivirira kwechikamu chepurasitiki. Nekudaro, nekuda kwekusiyana kwepurasitiki shrinkage renji uye kugadzikana, kutanga kune zvese, iwo dimensional kushivirira kwezvikamu zvepurasitiki zvakaumbwa nemapurasitiki akasiyana zvinofanirwa kutsanangurwa zvine hungwaru. Kureva kuti, kushivirira kwechidimbu kwepurasitiki yakaumbwa zvikamu zvepurasitiki zvinofanirwa kunge zvakakura nekuda kweiyo yakakura shrinkage rate renji kana kushomeka kweiyo shrinkage rate kugadzikana. Kana zvisina kudaro, nhamba huru yezvigadzirwa zvemarara zvine kunze-kwe-hurombo zviyero zvinogona kuitika.

 

Nechikonzero ichi, nyika dzakasiyana dzakanyatso gadzira zviyero zvenyika kana indasitiri zviyero zvekushivirira kwezvikamu zvepurasitiki. China yakamisawo makurukota ehunyanzvi zviyero. Asi mazhinji acho haana anowirirana dimensional kushivirira kwe mold cavity. Chiyero chenyika yeGerman chakanyatso gadzira iyo DIN16901 yakajairwa yepurasitiki chikamu dimensional kushivirira uye inoenderana DIN16749 chiyero che mold cavity dimensional kushivirira. Iyi chiyero ine simba guru munyika, saka inogona kushandiswa sereferensi yeindasitiri yepurasitiki mold.

Nezve dimensional kushivirira uye kutenderwa kutsauka kwezvikamu zvepurasitiki

 

Kuti uone zvine musoro kushivirira kwezvikamu zvepurasitiki zvakaumbwa nezvinhu zvine hunhu hwakasiyana hwekuderera, rega mwero uunze pfungwa yekugadzira shrinkage musiyano △VS.  

 

△VS=VSR_VST(4)

 

Ikoko: VS-inogadzira shrinkage musiyano VSR-inogadzira shrinkage mwero munzira yekunyunguduka kuyerera VST-inogadzira shrinkage mwero munzira yakatarisana nekunyungudika kuyerera.

 

Zvinoenderana nepurasitiki △VS kukosha, iwo shrinkage maitiro emapurasitiki akasiyana akakamurwa kuita mapoka mana. Boka rine diki △VS kukosha ndiro boka repamusoro-soro, uye zvichingodaro, boka rine hombe △VS kukosha ndiro boka repasi-chaizvo. Uye zvinoenderana nehukuru hwekutanga, iyo chaiyo tekinoroji, 4, 110, 120, 130, 140 uye 150 mapoka ekushivirira akaumbwa. Izvo zvakare zvakatemerwa kuti dimensional kushivirira kwezvikamu zvepurasitiki zvine hunhu hwakatsiga hwe shrinkage hunogona kusarudzwa kubva ku160, 110 uye 120 mapoka.

 

The dimensional tolerances yezvikamu zvepurasitiki zvakaumbwa zvine mwero zvakadzikama shrinkage hunhu ndeye 120, 130, uye 140. Kana 110 mapoka edimensional tolerances akashandiswa kugadzira zvikamu zvepurasitiki nemhando iyi yepurasitiki, nhamba huru yekunze-kwe-saizi zvikamu zvepurasitiki zvinogona. kugadzirwa. Iyo dimensional kushivirira kwezvikamu zvepurasitiki zvine maitiro asina kunaka ekuderera anosarudzwa kubva kumapoka 130, 140 uye 150.

 

Iyo dimensional tolerances yezvikamu zvepurasitiki neakaipisisa shrinkage maitiro anosarudzwa kubva kumapoka e140, 150 uye 160. Paunenge uchishandisa iyi tafura yekushivirira, unofanirwa kubhadhara kune zvinotevera pfungwa. Kushivirira kwakawanda mutafura kunoshandiswa kune dimensional tolerances izvo zvisingaratidzi kushivirira.

 

Kushivirira kwekumaka kutsauka zvakananga ndiyo nzvimbo yekushivirira inoshandiswa kuratidza kushivirira kwechikamu chepurasitiki. Kutsauka kwepamusoro uye kwepasi kunogona kugadziriswa nemugadziri. Semuenzaniso, kana nzvimbo yekushivirira iri 0.8mm, kutsauka kwepamusoro nepasi kunotevera kunogona kusarudzwa. 0.0; -0.8; ±0.4; -0.2; -0.5 zvichingodaro. Boka rimwe nerimwe rekushivirira rine masheti maviri ekushivirira maitiro A uye B. Pakati pavo, A hukuru hunoumbwa nekubatanidzwa kwezvikamu zve mold, izvo zvinowedzera kukanganisa kunokonzerwa nekusawirirana kwezvikamu zve mold.

 

Kuwedzera uku kuri 0.2mm. Ipo B ndiyo saizi inotarwa zvakananga nenhengo dze mold. Precision tekinoroji seti yekushivirira kukosha kwakanyatso kuisirwa zvikamu zvepurasitiki zvine yakakwira chaiyo zvinodiwa. Tisati tashandisa kushivirira kwezvikamu zvepurasitiki, tinofanira kutanga taziva kuti ndeapi mapoka ekushivirira akakodzera epurasitiki inoshandiswa.