基于注塑制品收縮率預測的模具型腔尺寸生成方法研究.pdf

1、大連理工大學碩士學位論文基于注塑制品收縮率預測的模具型腔尺寸生成方法研究姓名：鄭清娟申請學位級別：碩士專業(yè)：機械制造及其自動化指導教師：王敏杰20030301AbstractOnaccountoflightweightandgoodcomprehensivemechanicalproperties，injection—moldedpartsgetincreasinglywidelyusedinsuchindustriesasmechan

2、ical，electronics，aviationandSOonMeanwhile，theprecisionofplasticpansgetmorehighandtheshapesisalsogetmorecomplicatedUsingaverageshrinkageratesofinjection—moldedpartstOdecidethedimensionofmoldcavitycannotsatisfythedemandofh

3、i曲precisioninjection—moldedpartsTheexistinginjectionmoldCAD／CAM／CAEsystemgeneralybuildthe3Dgeometricmodelofinjection—moldedparts，thengiveascalecoefficientIS(Smeanstheaverageshrinkageratesofinjection—moldedpans)tothe3Dgeo

4、metricmodelofinjection—moldedpartstozoomintobuildthe3DgeometricmodelofmoldcavityAimingatit’Sshortage，thepaperanalyzetheinfluencefactorofshrinkageratesofinjection—moldedparts，anewmethodbasedonthepredictionofshrinkagerates

5、ofinjection—moldedpartstodecidethedimensionofmoldcavityisalsobroughtforwardinthispaper，ThescatterpointsofmoldedpansandthecorrespondingshrinkageisknownBybuildingtheconversionmethodbetweenthedimensionofinjection—moldedpart

6、sanddimensionofmoldcavitNwecarlgetthescatterpointsOilthesurfacesofmoldcavityInordertoestablishthethree—dimensiongeometricmodelofmoldcavityininjectionmoldCAD／CAMiCAEsystem，usingcubicB—sglineC13Ivesurfacetointerpolationtho

7、sescatterpoints，UseVisualC60andOpenGLtomaketheprogramAfterthefittingofthesinglecubicB—splinecurvesurface，theoutstandingreverseengineeringsoftwareImagewareSurfacerisusedtocompletetheconnetionofsinglecubicB—splinecHEvesurf

8、aceThus，thethree—dimensiongeometricmodelofmoldcavitysurfacesisestablishedForthedifferenceshrinkageofinjection—moldedpartsisconsideredinthemodelofmoldcavitNSOitcanreducethedeviationthatcausedbyshrinkage，thenimprovetherate

9、sofSucceSSandtheratesofeligibilityofthemolddesignIntheend，anexampleisusedtoshowthemethodthatthepaperhasproposed，Inordertovalidatethemethod，analysisofdeviationiSalSOputintouse，TheresultshOWSthatitcarlsat：isfiesthedemandof