资源描述：
《注射螺杆特点大全（features of injection screw）》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。
1、注射螺杆特点大全（Featuresofinjectionscrew）Withthedeepeningofunderstandingofpolymercompounds,injectionscrewhasmadegreatprogress.Becausethetechnicalperformanceoftheinjectionscrewisthekeytoachievegoodinjectionplasticizingperformance,itisparticularlyimportantfortherationald
2、esignoftheinjectionscrew.Thispaperanalyzestherelationshipbetweenthemaintechnicalparametersoftheinjectionscrewandthemainstructureandtechnicalperformance,isproposedtodeterminethemaintechnicalparametersofinjectionscrewprinciple,combinedwiththeauthor'sactualdesign,a
3、nalysisandresearcharecarriedoutmorespecificfromtwoaspectsoftheoryandpractice.ScrewlengthdiameterratioThescrewlengthtodiameterratioisaveryimportantparameterofthescrew,anditisespeciallyimportantforthecommonscrew.Theratiooflengthtodiameterofuniversalscrewisincrease
4、dfrom13~14to18,whichhasbeenincreasedto20~22,oreven26.1,screwlengthdiameterratioandinjectionstrokeInjectionstrokeexpressestheamountofinjection,anditisanimportanttechnicalparameter.Intheprocessofinjection,theamountofmaterialfilledbyscrewisaveryuncertainfactor.When
5、theinjection,thescrewaxialforward,thematerialintothescrewgroove,butnotfullofscrewgroove,becausetheinjectiontimeisinsufficienttomeetthetimerequiredtocompletelyfillthescrewgroove.Theairiseasytobeinhaledduetothesparsematerialfilling,andiftheaircannotbedischargedint
6、ime,theplasticizingqualitywillbereduced.Generally,themeteringstrokesizeisthemainfactordeterminingwhetheraircanenterthestoragecylinder.Thestudyofvariousmaterialsshowsthatifthemeteringstrokeisgreaterthan3D,thegasentrainmentwilloccuratthebackofthering.Ifthescrewdia
7、meterislessthan18(screwmeteringstroke3Dmeettheratiooflengthtodiameter),whichbegantomeltthesolidfeedingsectionlengthistooshort,willmakethesolidresiduetothecompressionsectionchangeinmeltmeltsolidincreaseinalargeamount,inseverecases,canevenbemadeintoconveyorstop.So
8、inordertoobtainthemeteringstrokemorethan3D,theeffectivelengthofthescrewmustbeincreased,thesolidmaterialinthefeedingprocesscanhaveenoughmeltmeltpath,toreducethesolidco
