射出成型壓力指標對於體積收縮率的影響評估：實驗與模擬比較;Evaluation of the volumetric shrinkage impacted by injection molding pressure indices : measurement and simulation

NCUIR > Engineering College > Executive Master of Mechanical Engineering > Electronic Thesis & Dissertation > Item 987654321/96394

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Title:	射出成型壓力指標對於體積收縮率的影響評估：實驗與模擬比較;Evaluation of the volumetric shrinkage impacted by injection molding pressure indices : measurement and simulation
Authors:	丁驊俊;Ding, Hua-Jun
Contributors:	機械工程學系在職專班
Keywords:	射出成型;Moldex3D;壓力指標;體積收縮率;Injection Molding;Moldex3D;pressure indices;volumetric shrinkage
Date:	2024-12-30
Issue Date:	2025-04-09 18:25:07 (UTC+8)
Publisher:	國立中央大學
Abstract:	本研究在透過在模具上安裝傳感器來收集成型過程中熔膠壓力變化的資訊，並將每個階段壓力分別以不同指標代替，研究中使用五項壓力指標（保壓階段壓力指標、最大壓力指標、總壓力指標、冷卻壓力變化指標、殘餘壓降指標）來表示不同階段的壓力變化，五項指標將用來說明不同階段實驗數據與模擬數據間的差距，以及探討射出成型過程中不同階段的壓力，對於不均勻體積收縮率的影響。在實驗與Moldex3D模擬結果的對比分析中可看出，保壓階段壓力差距為24.79 % ~32.18 %，壓力最大值差距為58.84 %~65.08 %，透過進一步比較發現是因為響應曲線不同造成的差距，在冷卻階段壓力變化模擬與實際較為相接近。比較不同階段對於不均勻性體積收縮發現，總壓力指標對於不均勻體積收縮率的皮爾森相關係數為-0.68，該值為五項指標中最大。冷卻壓力變化指標排在第二，保壓階段壓力指標則是排在第三，最大壓力指標、殘餘壓降指標對於不均勻體積收縮率關係性較不明顯，表明射出成型過程中總壓力是最為影響不均勻體積收縮，而個別階段壓力中，影響最為明顯的是冷卻階段。 ;This study collected information on the pressure changes of the melt during the molding process by installing sensors on the mold. Different indices represented the pressure at each stage. Five pressure indices (First-stage holding pressure index,Peak pressure index,Pressure integral index,Cooling pressure index and Residual pressure drop index) were used to describe the pressure changes at different stages. These indices were employed to explain the discrepancies between experimental data and simulation data at various stages and to explore the effect of pressure during the injection molding process on the non-uniform volumetric shrinkage rate. In the comparative analysis between the experimental results and the Moldex3D simulation results, it was found that the pressure difference during the holding stage ranged from 24.79% to 32.18%. Additionally, the maximum pressure difference ranged from 58.84% to 65.08%. Further comparisons revealed that differences in the response curves caused these discrepancies. During the cooling stage, the pressure change in the simulation was closer to the actual results. When comparing the effect of different stages on non-uniform volumetric shrinkage, the Pearson correlation coefficient of the Pressure integral index with the non-uniform volumetric shrinkage rate was -0.68, making it the largest among the five indices. Cooling pressure index ranked second, while First-stage holding pressure index ranked third regarding their impact on non-uniform volumetric shrinkage. At the same time, Peak pressure index and Residual pressure drop index showed less correlation with the non-uniform volumetric shrinkage rate. This indicates that the total pressure during the injection molding process greatly affects non-uniform volumetric shrinkage. The cooling stage pressure had the most significant impact on the individual stages.
Appears in Collections:	[Executive Master of Mechanical Engineering] Electronic Thesis & Dissertation

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