塑膠設(shè)計概論

1、CompalCompalCompalCompalCompalCompalCompalCompal 原料原料 塑膠塑膠 (聚合物聚合物)熱固性塑膠熱固性塑膠熱可塑性塑膠熱可塑性塑膠工程塑膠工程塑膠泛用塑膠泛用塑膠CompalCompal非結(jié)晶性非結(jié)晶性 化學(xué)性敏感化學(xué)性敏感 . 適度耐熱溫度適度耐熱溫度 . 較低模收縮率較低模收縮率 . 衝擊強度衝擊強度 . 均勻物性均勻物性 . 較低塑件成本較低塑件成本 較寬廣設(shè)計自由度較寬廣設(shè)計自由度 穩(wěn)定電氣特性穩(wěn)定電氣特性 可回收可回收 熱可塑性塑膠熱可塑性塑膠CompalCompal結(jié)晶性結(jié)晶性 抗化學(xué)性抗化學(xué)性 . 較高耐熱性較高耐熱性 . 缺口效應(yīng)

2、敏感缺口效應(yīng)敏感 . 模收縮率較大模收縮率較大 . 耐疲勞性耐疲勞性 . 耐磨耗性耐磨耗性 . 較高耐熱和抗?jié)撟冃暂^高耐熱和抗?jié)撟冃?耐電弧性耐電弧性 不可回收不可回收 熱固性塑膠熱固性塑膠CompalCompalCompalCompalCompalCompalCompalCompalCompalCompalCompalCompalCompalCompalCompalCompalCompalCompalCompalCompalCompalCompalCompalCompalCompalCompalTRibbingR = .020*The Larger the BetterLimited by

3、the possibility of sinks and voidsThermoplastics are relatively notch sensitive.tt = 0.6 T for T .125*1/2 to 1 1/2 degrees draftCompalCompalBoss DesignD2DWTR = .25 TStrong Possibility of Sink MarksWhen W .6 TH = 2 to 5TCompalCompalBoss RedesignD2DWTR = .25 TH = 2 to 5Tt = .5 to .7T to prevent sink m

4、arksCompalCompalGating Wall TransitionsUncompensated Shrinkage Leads to:WarpageUniform ShrinkageVoidsGating so that melt flows from thick to thin sections reduces uncompensated shrinkage.CompalCompalVoidsAlready Cooled SurfaceWill Not Yield to ShrinkingInteriorSink MarksSurface Yields to theStill Sh

5、rinking Interior MassCompalCompalCore Thick SectionsGradual TransitionsCompalCompalhhh3hPoorGoodBestCompalCompalCompalCompal 脫模角1/2?Min.脫模角CompalCompal蝕刻脫模角 每增加0.025深度 ,則加大1度脫模角CompalCompalCompalCompalCompalCompal二板模型式二板模型式公模 母模固定側(cè)模板 間隔塊 支持板 / 背板前頂板 後頂板導(dǎo)柱 回位銷CompalCompal二板型模具二板型模具CompalCompal標(biāo)準(zhǔn)二板型模具

6、標(biāo)準(zhǔn)二板型模具豎澆道A PlateB PlateSupport PlateEjector PlateCompalCompalParting LineCompalCompalTwo PlateMoldEjectionCompalCompalTwo PlateMoldEjection頂出成品CompalCompalCompalCompalCompalCompalSupport PlateEjector Retainer PlateEjector PlateEjector HousingB PlateX PlateA PlateTop Clamping Plate三板型模具三板型模具CompalCo

7、mpal三板型模具三板型模具閉模CompalCompal主要導(dǎo)柱Parting Line 1CompalCompalParting Line 1Parting Line 2CompalCompalParting Line 1Parting Line 2CompalCompalParting Line 1Parting Line 2PartingLine 3PartRunnerCompalCompal三板型模具三板型模具閉模CompalCompalCompalCompal不均平衡系統(tǒng)設(shè)計不均平衡系統(tǒng)設(shè)計AAAABBBBCompalCompal平均分佈設(shè)計平均分佈設(shè)計AAAAAAAACompalC

8、ompal容許最大材料流動塑料冷凝影響最少流道流道流動CompalCompal梯梯型型好好半圓型半圓型較差較差PLCompalCompal 流道流道 梯型側(cè)圖RDRD RD W D1/83/161/83/161/43/161/45/161/45/167/165/163/81/23/8對等設(shè)計之一對等設(shè)計之一設(shè)計之二設(shè)計之二DWCompalCompal 豎澆道勾梢豎澆道勾梢 倒斜度設(shè)計倒斜度設(shè)計優(yōu)優(yōu)“Z” 型型好好倒環(huán)型倒環(huán)型普通普通崁入型崁入型較差較差CompalCompal阻礙流動阻礙流動較佳設(shè)計較佳設(shè)計CompalCompal流動方向流動方向冷料井冷料井冷料井尺寸設(shè)計與流冷料井尺寸設(shè)計與流

9、道相同或大於道相同或大於1.5倍倍冷料井冷料井CompalCompal建議之流道尺寸建議之流道尺寸:流動均衡主流道 -全圓形 或 梯形設(shè)計9.5 250以上8.0 75 - 2506.5 75 或 以下次流道6.5 MinimumCompalCompal熱流道系統(tǒng)熱流道系統(tǒng)固定側(cè)模板固定側(cè)模板 = 50Manifold = 260優(yōu)點優(yōu)點 快速循環(huán)時間 - 15-20% 時間減少節(jié)省材料 - 沒有澆道和流道較好成品品質(zhì) - 減少應(yīng)力殘留 - 較佳外觀CompalCompal母模板母模板 = 50分歧塊分歧塊 = 260金屬熱膨脹系數(shù)金屬熱膨脹系數(shù): 0.00000633 in/C 6 in.

10、= .017 In.12 in. = .034 In.18 in. = .051 In.CompalCompalCompalCompal直接豎澆道直接豎澆道成形製品成形製品豎澆道豎澆道CompalCompal邊緣料口邊緣料口段道長段道長度度0.76 mm(Max)CompalCompalDisk or Diaphragm Gate流道流道成品成品流道流道豎澆道豎澆道CompalCompal成形品成形品 豎澆道豎澆道分模線分模線潛道潛道料口料口無段道長度無段道長度頂出梢頂出梢料口側(cè)打光平順料口側(cè)打光平順, Min. 20Fasten Pin Head To Prevent Turning潛道式料

11、口潛道式料口CompalCompal冷料井冷料井R角角改良式扇形料口改良式扇形料口CompalCompal成品成品流道流道澆口澆口段道段道扇形料口扇形料口CompalCompal料口料口成品成品碟型流道碟型流道料口料口環(huán)型料口環(huán)型料口CompalCompalRR料口料口腰果式料口腰果式料口 (牛角式牛角式)LCompalCompal0.5mm 段道長度段道長度1.27mm900針點式料口針點式料口 CompalCompal進料點選定進料點選定Gate Location is Strongly Influenced by Glass Content.End Gating is Preferred

12、 in Glass Filled Materials to Minimize Warpage.CompalCompal潛道潛道 成品成品豎澆道豎澆道分模線分模線澆口澆口 澆口澆口 冷料區(qū)冷料區(qū)潛道設(shè)計之冷料區(qū)潛道設(shè)計之冷料區(qū)CompalCompalCompalCompal加工空隙加工空隙0.05mm頂出梢部份頂出梢部份CompalCompal分模面部份分模面部份深度深度0.03-0.06mm料口料口排風(fēng)孔排風(fēng)孔1.5mm Min.Note Step1.27mm1.3mmMin.CompalCompalCompalCompalBlade atDeep RibsRounds PinsSleeveEjectorBossEjectMold PinStationaryPartsStripper PlateStationary ForceKnock OutBarsGOOD KNOCK OUTFOR ROUND PARTSUSED AROUNDPINS & BOSSESCompalCompal頂出機構(gòu)頂出機構(gòu) 頂出影響因素 :離模角度離模面積離模面粗糙度 / 蝕刻處理頂出角度模具溫度模具附著CompalCompal頂出機構(gòu)原則頂出機構(gòu)原則 :儘可能使用較大尺寸之頂針 .儘可能增加頂針數(shù)量 均勻地將成品頂出 .CompalCompalCo