Solutions to Common Molding Defects of Injection molding
Kukanganisa kwakajairika kana uchishandisa mold kugadzirisa majekiseni epurasitiki ekuumba zvikamu, uye izvi zvakanyanya kukanganisa mashandiro ekugadzirisa. Izvi zvinotevera zvinojairika kuumba kukanganisa uye mhinduro dzepurasitiki jekiseni mold zvikamu.
Short shots
Mapfuti mapfupi anoreva zvigadzirwa zvakagadzirwa hazvina kukwana nekuda kwezviumbwa hazvina kunyatsozadzwa.
Ichi chikanganiso chinowanzoonekwa panzvimbo iri kure kure negedhi kana zvikamu zvinongogona kusvikwa kuburikidza nenzvimbo dzakamanikana pane mold nekuti nzvimbo dzakatetepa dzinogona kukanganisa kuyerera kwekunyungudika.
Kupfurwa kupfupi kunogona kukonzera micro kuyerera mamaki kana kukonzera chikamu chikuru chechigadzirwa chishaikwe zviri pachena.
Cause:
Zvikonzero zvekupfura mapfupi zvinosanganisira:
Iyo mbishi inobaiwa muforoma haina kukwana.
Kurwisana kwekunyunguduka kwakakura, zvichiita kuti mold haigone kuzadzwa zvachose.
Kubuda kwe mold kwakashata uye kunokonzera chizvarwa che cavitation chinovhara kunyunguduka, zvichiita kuti kunyungudika kurege kuyerera kune dzimwe nzvimbo dzehutu.
Bururu
MaBurrs anogadzirwa kubva mukunamira kweakawandisa mbishi zvinhu zvakaburitswa kubva mugomba remuvhu kuenda kuchigadzirwa.
Ichi chikanganiso chichaita pamipendero pane chigadzirwa kana imwe neimwe inoumbwa chikamu che mold. Iyo mbishi inogona kunge yakapfachukira kubva mukuumbwa, kana nzvimbo dzekubatanidza dzekufamba uye kugadzirisa molds.
Burrs inogonawo kuwanikwa pane mold core, iyo inokonzerwa ne hydraulic pressure kana angular pini.
Kuoma kweburrs kunosiyana, dzimwe nguva kutetepa, dzimwe nguva kukora.
Cause:
Zvikonzero zveburrs zvinosanganisira:
Clamping mold surface yakakuvara kana kuti yakapfekwa zvakanyanya.
Iyo mold inofambisa uye inogadzirisa mold inobviswa-inowanikwa kana yakavharwa.
Dzvinyiriro yezvakagadzirwa mu mold yakakwirira kudarika mold clamping force.
Mamiriro echitatu ataurwa pamusoro apa angakonzerwa nezvikonzero zvakasiyana-siyana. Mumamiriro ezvinhu anotevera, kudzvanywa kwezvinhu zvakasvibiswa kwakakwira kudarika mold clamping force.
Panhanho yekutanga yejekiseni mold (mold yekuzadza nhanho), yakawandisa mbishi zvinhu inozadzwa, izvo zvinowedzera kudzvanywa mukati me mold.
Munguva yekuzadza mold, kupokana kukuru kwekunyungudika kuyerera kunosimudza kudzvanywa mukati me mold, zvakare.
Iyo mold cavity pressure yakakwira zvakanyanya panguva yekumanikidza kubata nhanho.
Mold clamping simba haina kukwana.
Kudzvinyirira
Kuora kunogona kutungamirira kumigumisiro yakawanda. Hukuru uye kuoma kwedambudziko kunosiyana, zvakare. Munyaya yakakomba, inogona kukonzera kupera kwemavara kwechigadzirwa uye kushata kwemagetsi zvinhu. Kushatiswa kwenzvimbo kunongokonzera mitsetse yakasviba kana mavara.
Cause:
Kuparara kwacho kunokonzerwa nekukanganiswa kwezvinhu. Long cheni mamorekuru anoumba mapurasitiki anozoora pasi pekuita kwekupisa kwakanyanya kana kunyanyisa kushushikana kweshear. Munguva yekuparara kwemamorekuru, gasi rinoputika rinomhanyisa maitiro ekuora, izvo zvinokonzeresa kubviswa-mavara kweiyo mbishi. Kuora kwehuwandu hwemamorekuru kunozopedzisira kutyora zviri mukati meiyo mbishi uye kukonzeresa kusarudzika pamagetsi emagetsi.
Kushatisa kwenzvimbo kunogona kukonzerwa nekusaenzana tembiricha yedhiramu yezvinhu.
Kushungurudzika kunogona kuitika mumamiriro ezvinhu anotevera:
Iyo mbishi iri kupiswa zvakanyanya mumudziyo wemidziyo kana inopisa mumhanyi system.
Iyo mbishi inogara mudhiramu kwenguva yakareba.
Munguva yekuumbwa kwejekiseni, iyo shear stress inoiswa pane mbishi zvinhu yakakurisa. Kana miromo yakavharwa, kana magedhi uye mumhanyi zvakanyanya kutetepa, zvinowedzera kushushikana kweshear.
Kuchinja
Mumamiriro ezvinhu akajairwa, maumbirwo ezvigadzirwa anofanirwa kuenderana neaya e mold. Iyo deformation inoreva kuremara kwezvigadzirwa.
Kana mamiriro acho achiwedzera kuipa, zvigadzirwa zvinozoremara zvachose kana zvaburitswa kubva muforoma. Kana mamiriro acho asina kukomba, chimiro chechigadzirwa chinotaridzika chidiki diki.
Yakareba asi isina mipendero yetsigiro kana ndege huru inzvimbo dzinonyanya kukanganiswa.
Cause:
Zvikonzero zve deformation:
Kupisa kwakanyanya kana mold yaburitswa.
Sezvo nguva yekutonhora yakasiyana munzvimbo dzakakora uye dzakatetepa, kana kusiyana kwekushisa kwe mold mukufambisa mold uye kugadzirisa mold, shrinkage mukati mezvigadzirwa zvakasiyana.
Mold inoyerera haina kutsvedzerera kana ichizadza (iyo inodaidzwa kuti "Freezing orientation") kana kudzvanywa mukati memugodhi yakakwira zvakanyanya pakumanikidza kubata nhanho.
Kusvibiswa
Izvo zvisina kuchena zvinowanzoonekwa nenzira yemavara mune akasiyana mavara, zvigamba kana mitsetse. Inonyanya kuzivikanwa ndeye black spot.
Kusachena kunogona kungova mavara madiki, asi zvakare anogona kunge ari mitsara akajeka kana chikamu chikuru chekubvisa-ruvara kana chakanyanya.
Cause:
Kusvibiswa kunokonzerwa nemashizha akasanganiswa nezvinhu zvakasvibirira, zvakadai se:
Iyo mbishi yakasanganiswa nesundries kana ichitakurwa mumadhiramu.
Kuparara kwezvinhu zvakasvibirira kunogona kunge kuri kudonha kubva kune chero nzira dzekucheka uye dzakasanganiswa kuita mbishi, senge mabhaudhi emuchina, madziro emukati ekuomesa chigubhu, majoini / nozzles.
Nyoni
Iyo lamination ichagadzira "ganda rekuita" pamusoro pezvigadzirwa, izvo zvinokonzerwa nekusiyana kwezvivakwa uye maumbirwo epamusoro pezvigadzirwa uye zvimwe zvigadzirwa, uye inoumba ganda rinoputika rinogona kubviswa.
Kana lamination iri yakakomba, nzvimbo yese yemuchinjikwa inoumbwa nezvikamu zvakasiyana, uye haina kunyungudutswa pamwechete. Kana kukanganisa kusinganyatso kuoneka, kutaridzika kwezvigadzirwa kunogona kusangana nezvinodiwa, asi kuchapwanya michina yezvigadzirwa.
Cause:
Pane zvikonzero zviviri zvikuru zvelamination. Yekutanga ndeyekuti kana marudzi maviri akasiyana emidziyo yakasanganiswa pamwe zvisizvo. Zvinhu zviviri zvakasvibiswa zvichaendeswa mubhodhoro panguva imwe chete pasi pekumanikidzwa. Zvisinei, kana chakuvhe chisingagoni kunyungudutswa pamwe chete kana chatonhodzwa, sezvinongoita zvidimbu zvakasiyana zvinotsikirirwa pamwe chete kuti zvigadzire zvigadzirwa.
Chechipiri: kana kutonhora kunyunguduka kuchimanikidzwa kupfuura nepagedhi rakamanikana, shear stress inogadzirwa. Kunyanya shear kushushikana kunokonzeresa iyo yakanyunguduka layer yakanyungudutswa pamberi haigone kusanganiswa zvachose.
Ngozi yekusanganiswa:
Chinhu chimwe chete chinofanirwa kuziva ndechekuti zvimwe zvinhu zvakasanganiswa zvakasanganiswa zvinokonzeresa kuita kwakasimba kwemakemikari, sePVC neAvetal hazvifanirwe kusanganiswa.
Silver linear
Sliver linear inogona kungova chiitiko chemunharaunda, asi inogona kukwidziridzwa kusvika pese pese kana yakakomba.
Silver linear inokanganisa kutaridzika kwezvigadzirwa uye zvakare inokuvadza michina yezvigadzirwa.
Cause:
Aya mapoinzi maviri anotevera anokonzera sirivheri linear:
Iyo mbishi inonyorova uye dzimwe dzacho dzinotora chiutsi mumhepo. Kana iyo mbishi yakanyanyisa kunyorova, iyo yakamanikidzwa mhute inogona kugadzirwa pasi petembiricha yepamusoro uye yakanyanya kudzvanywa kwembiru. Uhu hupfu hunoputika nepamusoro pechigadzirwa uye hunoita mitsetse yesirivha.
Iyo melt yakakuvadzwa nekupisa uye inogadzira kuderedzwa kwenzvimbo. Iyo gasi inoputika inogadzirwa ichavharwa pamusoro pemuvhu uye kugadzira mitsetse pamusoro pezvigadzirwa.
Izvi hazvina kuipa sekudzikisirwa. Chero bedzi tembiricha yekunyunguduka yakakwira kana ichiiswa kune shear stress panguva yeplasticization kana jekiseni mu mold, izvi zvinogona kuitika.
Kupenya/mumvuri
Kupera kwepamusoro kwezvigadzirwa kunofanirwa kunge kwakafanana neiyo molds. Kana kupera kwepamusoro kweviri kwakasiyana, gloss / mumvuri urema wakaitika.
Kumusoro kunenge kwakasviba kana pakakanganiswa, uye nzvimbo yakakasharara inotsvedzerera uye inopenya.
Cause:
Zvinokonzera kupenya/mumvuri zvinosanganisira:
Iyo inonyungudika inoyerera isina-yakatsetseka kana tembiricha ye mold yakadzikira, zvichikonzera kuti iyo mold ipere haigone kudzokororwa kana zvinhu zvichiumbwa.
Munguva yekumanikidza kubata, kudzvanywa kuri mugomba hakuna kukwirira zvakakwana kuita kuti zvinhu zvibatire pamusoro pe mold mukutonhora, zvichisiya shrinkage mamaki.
Maruva anoyerera
Kuyerera mavara anogona kuwanikwa pamusoro pezvigadzirwa mune akawanda mafomu. Kazhinji, ichaita nzvimbo yemumvuri.
Kuyerera kwemavara haaburitse chero embossing kana kuora mwoyo pamusoro pezvigadzirwa, izvo zvisingagoni kunzwika neminwe. Chirema ichi chinonziwo madhiri, ghosting, uye mimvuri.
Kana mavara ekuyerera achinge ari pachena, anoburitsa grooves, uye osiya akaremara senge mamakisi pamusoro pezvigadzirwa.
Cause:
Mamiriro ekuyerera anogona kuwanikwa kana:
Kuyerera kwekunyunguduka kwakashata kana tembiricha yepasi ye mold yakadzikira, zvichikonzera kuyerera kukuru kwepurasitiki mukuzadza mold.
Mukuzadza mold, iyo inonyunguduka inoyerera nekupokana, iyo inogona kukonzerwa neiyo isina kuenzana pamusoro pekufa, mamakisi kana mapatani akadhindwa pane inofa, kana shanduko yekunyungudika kuyerera kwekutungamira panguva yekuzadza.
Kubatanidza mutsara
Mutsara wekubatanidza unogadzirwa kana maviri melt fronts asangana panguva yekuzadza mold, uye ichaonekwa pamusoro pechigadzirwa semutsara.
Kubatanidza mutsara kwakafanana nemutsara wekuputika pamusoro pezvigadzirwa, izvo zvisiri pachena kuti zvione.
Paunenge uchigadzira molds, mimwe mitsetse yekubatanidza inooneka haidzivisiki. Muchiitiko ichi, inopfupisa mutsara wekubatanidza zvakanyanya sezvinobvira kudzivirira kusimba uye kutaridzika kwezvigadzirwa kukuvara.
Cause:
Pane zvikonzero zvakawanda zvechizvarwa chekunyungudika pamberi. Chikonzero chikuru chinogona kunge chiri kunyunguduka kuyerera nemumicheto wemold core. Kana iyo miviri yakanyunguduka yasangana, inoburitsa mitsetse yekubatanidza. Tembiricha yezviviri zvinonyunguduka kumberi kunofanirwa kunge kwakakwira zvakakwana kuti zvibvumire kuti ive fuse pamwe chete zvinobudirira, uye hazvikanganise kusimba uye kutaridzika kwezvigadzirwa.
Kana iyo miviri yakanyunguduka isingakwanise kusanganisa pamwechete zvachose, kuremara kunogadzirwa.
Zvinokonzera kukanganisa:
Iyo mold ine zvikamu zvakakora uye zvakatetepa, uye kuyerera kwekukurumidza kwekunyunguduka kwakasiyana, apo kunyunguduka kunoyerera nepakati pechikamu chakaonda chekuumbwa, kutonhora kwakaderera.
Hurefu hwemumhanyi wega wega hwakasiyana. Vamhanyi vari voga vachava nyore kutonhora.
Iyo mold cavity pressure haina kukwana zvakakwana kubvumira kunyunguduka kuti fuse zvachose panguva yekumanikidza kubata nhanho.
Mabhubhu akasara anoita kuti kunyungudika kumberi kusakwanise kusanganisa, izvo zvinozotungamira mukutsva.
Burning
Kupisa kwakafanana neiyo yepfuti pfupi, asi ine mipendero isina kupera uye kunhuhwirira kushoma. Nzvimbo dzekabhoni dzakasviba dzichaonekwa pachigadzirwa, kana mamiriro acho akakomba, achiperekedzwa nekunhuhwirira kwekupisa kwepurasitiki.
Kana zvikanganiso zvisina kubviswa, kazhinji pane dema deposition pane mold. Kana iyo gasi kana mafuta zvinhu zvinogadzirwa nekupisa zvikasatariswa nekukurumidza, zvinogona kuvhara maburi emhepo. Kupisa kunowanzo kuwanikwa pamagumo enzira.
Cause:
Kupisa kunokonzerwa nekupisa kwemukati. Kana kudzvinyirirwa mumhepo kuchiwedzera zvakanyanya munguva pfupi pfupi, tembiricha inokwira uye ichikonzera kupisa. Zvinoenderana nedata rakaunganidzwa, iyo yemukati yekupisa mhedzisiro mune jekiseni molding process inogona kuburitsa yakanyanya tembiricha inosvika 600 degrees.
Kupisa kunogona kugadzirwa kana:
Iyo mold yekuzadza kumhanya inokurumidza kuitira kuti mhepo irege kuvharwa kubva mugomba remuvhu, uye inogadzira mabhuru emhepo nekuda kwekuvhara kwepurasitiki iri kuuya, uye inotungamira mukupisa kwemukati mushure mekumanikidzwa.
Makomba emhepo akavharwa kana kuti mhepo yekufefetera haina kutsetseka.
Mhepo iri mu mold inofanira kuvharwa kubva kumakomba emhepo. Kana kufefetera kuchikanganiswa nechinzvimbo, nhamba, saizi kana mabasa, mhepo ichange ichigara muforoma uye ichitungamira mukutsva. Hombe mold clamping simba inozotungamira mukushaikwa kwemhepo.
Shrinkage
Shrinkage inoreva makomba madiki ari pamusoro pezvigadzirwa.
Kana zvikanganiso zviri zvishoma, pamusoro pezvigadzirwa hazvina kuenzana. Kana yakakomba, nzvimbo huru yezvigadzirwa ichadonha. Zvigadzirwa zvine arches, zvibatiso uye protrusions zvinowanzo tambura nekuremara kwe shrinkage.
Cause:
Shrinkage inokonzerwa nekukura-nzvimbo shrinkage yezvinhu zvakasvibirira panguva yekutonhora.
Munzvimbo yakakora yezvigadzirwa (senge arch), iyo yepakati temperate yezvinhu yakadzikira, saka shrinkage ichaitika gare gare kupfuura iyo yepamusoro, iyo inoburitsa simba rekumanikidza mukati meiyo mbishi, uye kudhonza rutivi rwekunze mukati mekuora mwoyo kwemukati. kugadzira kuderera.
Shrinkages inoitika mumamiriro ezvinhu anotevera:
Dzvinyiriro iri mugomba re mold yakadzikira pane simba rinogadzirwa kubva mukupfava kwezvinhu mbishi mukutonhodza.
Kusakwana kudzvanya nguva ye mold cavity panguva yekutonhora, zvichikonzera kuti iyo mbishi inoyerera ichibuda mugomba kubva kugedhi.
Iyo mbishi haina kukwana buffering simba panguva yekuumbwa uye kudzvanywa kwekubata nhanho sezvo screw inobviswa zvachose iyo yakawandisa mbishi isati yaiswa jekiseni.
Nzvimbo dzepamuchinjikwa dzemasuwo uye vanomhanya idiki zvakanyanya pane ukobvu hwezvigadzirwa, zvinoreva kuti masuwo atove nechando pamberi pezvigadzirwa extrusion process.
matema
Iyo vacuum bubbles inounzwa nenzira yemabhuru emhepo, ayo anogona kuwanikwa zviri nyore pane akajeka zvigadzirwa. Inogonawo kuonekwa pamuchinjikwa wezvigadzirwa zve opaque.
Cause:
Mhepo mabhubhu ndiyo vacuum chikamu chezvigadzirwa, izvo zvinogadzirwa kana mbishi inodzikira panguva yekutonhora.
Zvakafanana nekuderera, mukati mezvakagadzirwa zvinogadzira simba rechibvumirano. Chii chakasiyana ndechekuti chitarisiko chekunze chezvigadzirwa chakasimbiswa kana mabhubhu akaumbwa, uye hapana kudonha, saka mabhururu anogadzirwa.
Zvikonzero zvemabubbles zvakafanana neaya ekuderedza, kusanganisira:
Kusashanda kwe mold cavity pressure
Insufficient cavity pressurization nguva
Saizi yemumhanyi uye gedhi idiki zvakanyanya
Kumwaya mavanga
Spraying marks zvinoreva nzvimbo ine thread yakatarisana negedhi. Iyo yekupfapfaidza mamakisi haingokanganisa kutaridzika kwezvigadzirwa, asi zvakare inokanganisa kusimba kwezvigadzirwa.
Cause:
Kupfapfaidza mamaki kunokonzerwa nekunyungudika kuyerera kunze kwekutonga panguva yekuzadza mold.
Plastiki yakanyungudutswa inopinda muforoma pasi pekumanikidzwa kukuru. Kana iyo mold yekuzadza kumhanya yakanyanyisa, ipurasitiki inoburitsa kubva pakavhurika gap remugodhi, uye nekukasira kudzoka uye kutonhorera. Panguva iyoyo, tambo dzinoumbwa, izvo zvinovhara mapurasitiki akanyungudutswa achipinda mumasuwo.
Chikonzero chikuru chekupfapfaidza mamakisi inzvimbo isiriyo yemasuwo kana dhizaini yegedhi. Mamiriro maviri anotevera anowedzera mamiriro ekuremara:
High mold kuzadza kukurumidza
Kusakwana kunyungudika kuyerera panguva yekuzadza mold
