机构

塑胶常见不良(英文版)

字号+ 作者/录入:3d3d 来源:工业设计.中国 2009-04-17 [在线反馈] 我要评论

塑胶常见不良(英文版),结构工程师备用资料

The cause and corrective action for usual defect            C9x大湾区工业设计网
No.1       short shot           C9x大湾区工业设计网
     Definition:the phenomena that the melt resin cann`t fill all the corner of mold is conside short shot.            C9x大湾区工业设计网
     cause an corrective action:           C9x大湾区工业设计网
     I.The machine is not mathch with the product  because that the cablitily of the plastical or the unit of shot is not enough           C9x大湾区工业设计网
     corrective action:           C9x大湾区工业设计网
     change more larger machime to keep up the largest unit of the machine more than 80% of the product's weight that include           C9x大湾区工业设计网
     the gating`weight.           C9x大湾区工业设计网
     II.The size of nozzle is too small and then result in the cold barden stopping melt resin flowing            C9x大湾区工业设计网
     corrective action:           C9x大湾区工业设计网
     change more larger nozzle             C9x大湾区工业设计网
     III.The design of the geat is faulty and then cause the melt resin to flow is difficult            C9x大湾区工业设计网
   Corrective action:           C9x大湾区工业设计网
     modify the git's size or it's position           C9x大湾区工业设计网
      IV.The resin cann't melt evenly and rusult in the injection pressure lowering too much.           C9x大湾区工业设计网
     Corrective action:           C9x大湾区工业设计网
     adminste the screw back pressure to make the resin melt evenlyC9x大湾区工业设计网
      V.The scoop for cold burden at the end of the geat is not adequacy because of it's deep or position,and result that theC9x大湾区工业设计网
      cold burden  to impede meld resin fill up the mold's impression.C9x大湾区工业设计网
      corrective action:C9x大湾区工业设计网
      enlarge the room of the scoop for cold burden or chage it's position.C9x大湾区工业设计网
      VI:the mold is too cold and the melt resin flowing is difficultC9x大湾区工业设计网
      Corrective action:C9x大湾区工业设计网
      improve the mold's temperature to content with the need of product C9x大湾区工业设计网

No.2   FluSHC9x大湾区工业设计网
     definition: the melt resin along the parting lines of mold or the interface of side coreC9x大湾区工业设计网
     Cause and corrective action:C9x大湾区工业设计网
      I.the clamping fource is not enoagh and  the melt resin flow out froming  backlash C9x大湾区工业设计网
      Corrective action:C9x大湾区工业设计网
      increas clamping fource or change more langer machineC9x大湾区工业设计网
      II.There is crevice for the nozzle is not completely touch the sprue BushC9x大湾区工业设计网
      Corrective action:C9x大湾区工业设计网
      increase the fource of device for injecting.C9x大湾区工业设计网
      III.The usland guid pins were weared and teared C9x大湾区工业设计网
      Corrective action: C9x大湾区工业设计网
      change guid pin that have been weared and teared.C9x大湾区工业设计网
      V.There are miscellanous object on the parting lines of  mold C9x大湾区工业设计网
      Corrective action:C9x大湾区工业设计网
      Clean the parting linesC9x大湾区工业设计网
      VI.The projection of the product is too large or the temperature of the resin is too high.C9x大湾区工业设计网
      Corrective action:C9x大湾区工业设计网
      a:change more larger machine.C9x大湾区工业设计网
      b:lower the temperature of resin C9x大湾区工业设计网

No3. Sink  marksC9x大湾区工业设计网
      Because of contraction of material after cooling ,the surface may have indentation mark tgpically at thick sections  C9x大湾区工业设计网
      cause and corrective action:C9x大湾区工业设计网
      I.injecting pressare is not enough C9x大湾区工业设计网
       We had betten improved injecting pressure when the product's shrinkage produce for the lower injecting pressure.C9x大湾区工业设计网
     II.The short-time for hold pressureC9x大湾区工业设计网
       If the time of hold pressure is not enough, The crinkling could not be make up in time and it is possible that the C9x大湾区工业设计网
       melt resin  back flow,  at this time ,we should delay the hold-timeC9x大湾区工业设计网
     III.The injecting speed is too show C9x大湾区工业设计网
       it will congealing quickly if the injecting speed is too slowC9x大湾区工业设计网
     Iv.The unit of shot is not enoceghC9x大湾区工业设计网
       in order to solove this problome we should added the unit of shot C9x大湾区工业设计网
     V.The Temperature of  mold or  resin is too high, in this case the product`s cooled--speed is slow and when it  shrinked C9x大湾区工业设计网
       compeletely there will produce sink marksC9x大湾区工业设计网
     VI.the size of git or lip is too small C9x大湾区工业设计网
       The melt resin cann't be compressed completely because that the injecting pressure lose quickly for the small gatings C9x大湾区工业设计网
       or lips ,so we should enlage the size of gatings or lips.C9x大湾区工业设计网
     VII.the dabber is too thickC9x大湾区工业设计网
       Usualy the dabber's thickness should be contraled in 50~80% of the wall ,and it should be more lighter at these position C9x大湾区工业设计网
       that far away frow the lips, beside these,  the dabble should be thicker and thicker from it's buttom in order to reduceC9x大湾区工业设计网
       the diffrent crinble.C9x大湾区工业设计网
     VIII.mold be cooled is not appropiatty C9x大湾区工业设计网
       mold should be cooled completely and evenly to equal  the shrinkingC9x大湾区工业设计网

NO.4. BubblesC9x大湾区工业设计网
     definition:the moisture and the volatile matter that were hided in the melt resin be remnanted in the production when C9x大湾区工业设计网
                    injecting and found holes finaly,usualy, it  caused by the moisture, volatile matter air and so on.C9x大湾区工业设计网
     Corrective action:C9x大湾区工业设计网
      I.dry the resin completely before  molding. C9x大湾区工业设计网
      II.lower the temperature of the end of the CYL. and improve the screw back pressureC9x大湾区工业设计网
      III.lower the temperature of resin so that the resin cann't resolveC9x大湾区工业设计网

NO.5. CrackingC9x大湾区工业设计网
     definition:The serious pull marks  at the surfface of product is consided crackingC9x大湾区工业设计网
    Cause:C9x大湾区工业设计网
     I. drawing of patterns is difficult C9x大湾区工业设计网
     II.the impression was filled too muchC9x大湾区工业设计网
     III.the temperature of the mold is too lowC9x大湾区工业设计网
     IV.the structure of produet is faultly.C9x大湾区工业设计网
    Corrective action:C9x大湾区工业设计网
     I.there should be enough gradient for drawing of patterns to avoid the fault of ejecting ,at the same thim we should checked C9x大湾区工业设计网
       the size and position of ejector pin so that the fource of ejecting is equallyC9x大湾区工业设计网
     II.If the melt resin filled up mold is too much or the unit of injecting is too large it will increase the  stress inside and resultC9x大湾区工业设计网
       in  cracking when ejecting.In this condition, it will be more serious that all part of the mold transfigared   and  the ejecting C9x大湾区工业设计网
       will be more difficult too.and usually the dabbles will crack.In order to reduce the extend of filled,we should reduceC9x大湾区工业设计网
       the injecting pressure or the resin's temperature and mold's temperature. C9x大湾区工业设计网

NO.6. Stress marksC9x大湾区工业设计网
     definition:A ltcallized white spots typically caused by pushing the materical near fracture point.It typically appears near C9x大湾区工业设计网
                     the ejector pin marksC9x大湾区工业设计网
     stress marks is not cracking but is the prdecessor of cracking:It is caused by the serious stress inside and usually be found C9x大湾区工业设计网
     on these prouduct that it's material is ABS, HIPS.C9x大湾区工业设计网

NO.7.  StrainC9x大湾区工业设计网
     The part surfaces that do not meet the surface  specs in the drawing,typically a curved surface that is supposedly to be  C9x大湾区工业设计网
     flatC9x大湾区工业设计网
     It was caused by usualy:C9x大湾区工业设计网
     a.stress inside C9x大湾区工业设计网
     b.temperature of mold or resin is not evenly C9x大湾区工业设计网
     c.the faulty condition of injectingC9x大湾区工业设计网
     d.the structure of productC9x大湾区工业设计网
     The crrective action of it is depend on the structure of product. It is deffrent for deffrent reasonC9x大湾区工业设计网
     I.the thickness is not even or mold is not cooled proportionatly C9x大湾区工业设计网
       It will strain because the diffrent cooling speed caused by the diffrent thinkness. So that the wall is more thicker or more C9x大湾区工业设计网
       near by the lips, it will be cooled more effectively.C9x大湾区工业设计网
     II.caused by the diffrent shrinkC9x大湾区工业设计网
       We usually  adopt more lower temperature of mold or resin to reduce the hot-contraction and take high injecting pressureC9x大湾区工业设计网
       or long  hold-pressure's time to make up the hot-contraction.C9x大湾区工业设计网

NO.8.  weld lineC9x大湾区工业设计网
     Two stream melt resin or more flow together and produce line be call weld line,It caused by followingC9x大湾区工业设计网
     I.the states of flowing because of the  product`s struture C9x大湾区工业设计网
     II.the capability of melt resin's flowingC9x大湾区工业设计网
     III.the air,the volalile matter and release was draw into melt resinC9x大湾区工业设计网
         The weld line was melt resin cann't weld completely because that the temperature of the front melt resin is lower C9x大湾区工业设计网
         than other. It cann't inevitable that there  appearace weld line around the product's windows and hopes.But  when theC9x大湾区工业设计网
         capability of resin's flowing is well, the weld line will become lighter or cann't be seen ,at the same time,the weld line C9x大湾区工业设计网
         will become lighter too when raise up the resin or mold's temperature.C9x大湾区工业设计网
         Change the number of lips or it's position ,the weld line's position will be changed .  But we can  set up a bath on the C9x大湾区工业设计网
         weld  line's end to changer the weld line`s position and then cut off it.C9x大湾区工业设计网
         The weld line not only affect the appearance,but alose affect the strain.C9x大湾区工业设计网
     corrective action:C9x大湾区工业设计网
     I.raise up the temperature of resin or mold when it is too lowC9x大湾区工业设计网
     II.increase the injecting pressure when it is not enough C9x大湾区工业设计网
     III.Increase the speed of injecting when it is too slow C9x大湾区工业设计网
     IV.enlarge the size of lips or gating when it is too smallC9x大湾区工业设计网
     V.reduce the distance that from weld line to lips when the distance is too largre C9x大湾区工业设计网
     VI.set up pin for releaseing when it's difficult to releaseC9x大湾区工业设计网
     VII.change the number of lips or it's position when the lips are not properC9x大湾区工业设计网

NO.9.Flow marksC9x大湾区工业设计网
     definition:flow marks is the trace of the flowing melt resin and usually it radiate frow the center to around.The reason C9x大湾区工业设计网
                     of the flow marks takes from is that the original melt resin was cooled quickly and cann't mixed well with theC9x大湾区工业设计网
                     lasted resin C9x大湾区工业设计网
     Corrective action:C9x大湾区工业设计网
     I.improve the mold or resin's temperature C9x大湾区工业设计网
     II.improve the injecting pressure C9x大湾区工业设计网
     III.change the position of gating for cool-waterC9x大湾区工业设计网
     IV.enlage the size of lips or gatings C9x大湾区工业设计网
     V.increase the unit of cushionC9x大湾区工业设计网

NO.10. Jetting marksC9x大湾区工业设计网
     definition:jetting marks like a crawling snake after the melt resin inject in mold`s impression through the gate and congealing.C9x大湾区工业设计网
                    The jetting marks usually appearance on the product that their lips are their edge or have no scoop for cooling C9x大湾区工业设计网
                    materisl. And the reason of it  as lik as the flow marks's C9x大湾区工业设计网
                    The corrective action to prevent the jetting marks was to improve resin's temperature or mold's and  set up large C9x大湾区工业设计网
                    scoop for cooled material, changer the form of lips and enlarge the size of it`s or slow the injecting speed and so on.C9x大湾区工业设计网
 C9x大湾区工业设计网
NO.11.sliver steraksC9x大湾区工业设计网
      definition:at the surfface or near by, these steraks look sliver and along the direction of flowing were called sliver steraksC9x大湾区工业设计网
      cause :C9x大湾区工业设计网
      I.there are moisture and volatilizing substance in resinC9x大湾区工业设计网
      II.the resin stopping in the CYL. for long timeC9x大湾区工业设计网
      III.the resin resolved for the temperature raising abnormally C9x大湾区工业设计网
      IV.the airways were stuffed and it's difficalt to releaseC9x大湾区工业设计网
      V.there are oil or moisture on the surface of the mold C9x大湾区工业设计网
      VI.diffrent resin mixed in it C9x大湾区工业设计网
      VII.air in the cyl. and cann`t be released  because that there are too muchC9x大湾区工业设计网
      VIII.resin resolved because of high temperature caused by high speed C9x大湾区工业设计网
      Corrective action:C9x大湾区工业设计网
      I.when the cablitily of the machine injecting or plasticing is not enough ,the resin at the front solidy quickly and then causeC9x大湾区工业设计网
        to produce sliver steraks, At this time we should change more larger machine.C9x大湾区工业设计网
      II.the resin stopping in the CYL. for long time,the air that  risin resolved is too much and cann`t  be releasd in time or  C9x大湾区工业设计网
          completely, so we should reduce the cycle-time as this time.C9x大湾区工业设计网
     III.the circumstance of too-big injecting pressure and too-rapid iejecting velocityC9x大湾区工业设计网
          If the thickness change rapidly ,flowing compressed resin expand be cause of fast pressure reduce,volatilizing  and C9x大湾区工业设计网
         analytical gas liquefy after touch on the mould,so we should reduce injecting pressure and relocity,make  thicknessC9x大湾区工业设计网
          change equableC9x大湾区工业设计网
     IV.The circumstance of air getting into screw C9x大湾区工业设计网
          If the material barrel is cooled  absolutely the temperature of barrel side is lower than heat rat,so the resin often scratchC9x大湾区工业设计网
          screw,so we should reduce rotating velocity,increase screw back pressure,material is compressed then air can get offC9x大湾区工业设计网
          from barrel sideC9x大湾区工业设计网
     V.When plastic contain water,rolatilizing substance,Strong absorption resin such as PMMA.ABS.AS...must be dried at first.C9x大湾区工业设计网
     VI.When the temperature of mould is too low.C9x大湾区工业设计网
          Under this circumstance plastic is solidfying rapidly,gas can't get off completely ,so mould temperature should increasedC9x大湾区工业设计网
     VII.When geat or gating is too small.C9x大湾区工业设计网
          Because flow resistance increase,filling velocity decrease,resin solidize rapidly,It's neccessary to enlarge geat and gating.C9x大湾区工业设计网
     VIII.When mould release diffcultly C9x大湾区工业设计网
          If mould release diffcultly,increase vent is necessary.C9x大湾区工业设计网
     VVI.When oil or water or release adhere to the sarface of impression.C9x大湾区工业设计网
          When oil or water or release adnere to the surface of impression,Oil ,water or release will eraporate because of plastic heat  C9x大湾区工业设计网
          and liquidize whth resin solidizing,So we need cleaning mold,and Limit the use of releaseC9x大湾区工业设计网

NO.12.Burn MarksC9x大湾区工业设计网
     Definition: Comman definitron of burn marks,mean the deformation of the surface of the product which is by over-heated,C9x大湾区工业设计网
                       and the blackness of acute part or gill,the front of the dabber.C9x大湾区工业设计网
     Burn marks is caused by the air in mould,whill release slowly when the melt material get in,is compressed,its temperatureC9x大湾区工业设计网
     increase remarkablely ,There are two effective and prevent action Locating vent.Firstly, in the place of which air gatherC9x大湾区工业设计网
     easily or making use of the interval of eject pion and core pin,so remain air release rapidly.Secondly,lower the temperature,C9x大湾区工业设计网
     reduce injecting  pressure and velocity or enlarge the gate At last,Draw out air in the mould by facinating vacual bump,C9x大湾区工业设计网
     vacunmizing the cavitig when formingC9x大湾区工业设计网

NO.13.Black StreaksC9x大湾区工业设计网
    Definition :Black streaks mean the phenomena of black sereaks adhered on the product C9x大湾区工业设计网
    Cause and corrective action:C9x大湾区工业设计网
    I. cause:C9x大湾区工业设计网
    When lubricant is lack,produced craping heat seariously and difficult releasing will cause burnC9x大湾区工业设计网
    Comective action:C9x大湾区工业设计网
     Add proper quantity of labricant,but if lubricant is more than 0.2%,on the contrary valatilizing substance of labricantC9x大湾区工业设计网
     will help it burn easily,so black streaks produced:C9x大湾区工业设计网
     II.cause:C9x大湾区工业设计网
     The product is too small but machine is too large and then the resin resolved for long time stopping in the pipe C9x大湾区工业设计网

塑胶件常见不良
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