塑胶产品注塑成型常见问题及改善对策.doc

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1、塑胶产品注塑成型常见问题及改善对策Asastructuraldesignengineer,whentrytodieandmoldinjectionmoldingbadlikenow,oftenseeproductswhileinjectionisbadbytimingmachinepersormeltoimprove,butasanexperieneeddesignengineers,stillhavetounderstandsomeofthecommoninjectionmoldingbadproblemsandimprovementmeasures!Themoldingde

2、fectsandanomaliesareultimatelyfocusedonthequalityoftheinjectionmoldingproducts・Thedefectsofinjectionmoldingproductscanbedividedintothefo11owingpoints:(1)inadequateinjectionofproduct;(2)productoverflow;(3)productdentsandbubbles;(4)theproducthasaconnection;(5)theproductwascrisp;(6)plasticchang

3、escolor;(7)theproductshavesilver,stripesandripplemarks;(8)theproductgateiscloudy;(9)productwarpandcontraction;(1)theproductsizeisnotallowed;(2)intheproductpastemould;(3)materialandpastedstreams;(4)thenozzlesalivate・Thereasonsandwaysofovercomingitaredescribedbelow・Howdoesthepersonovercomethep

4、roductinjection?Theshortageoftheproductisoftenduetothefactthatthematerialissolidifiedbeforeitisfullyformed,andtherearemanyotherreasons・Forthereasonsoftheequipment:Stopmaterial;Theindentedpartsoftheneckoralloftheblockages;Inadequateamountofmaterial;Theoperationofthechargecontrolsystemisabnorm

5、al;Thecapacityofthemachineistoosmall;TheinjectionperiodofthedeviceisabnormaLThereasonsfortheinjection:Theinjectionwastoo1ow:Intheinjectioncycle,theinjectionpressureistoogreat;Theinjectionistooshort;Thetotalpressuretimeistooshort;Therateofinjectionistooslow;Theflowofmaterialinthecavityisinter

6、rupted・Therateofchargevaries;Anabnormalinjectioncyclecausedbytheoperationcondition.Thereasonforthis:Raisethecylindertemperature;Raisingthenozzletemperature;Toexaminemillivoltmeters,thermocouples,electricresistance(orfar-infraredheating),andheatingsystems;Improvemoldtemperature;Checkmoldtempe

7、raturecontroldevice・(4)mouldThepassageistoosmall;Thegateistoosmall;Thenozzleholeistoosmall;Thepositionofthegateisunreasonable;Thenumberofwatersprueisnotenough;Thecoldholesaretoosmall;Lackofexhaust:Anabnormalinjectioncyclecausedbytheinjectionmould;C