Analyzing Annealing Effects on Residual Stresses in Injection Molded Microstructures

IF 1.9 4区 工程技术 Q2 Engineering
Wanlin Wang, Huabin Yang, Yilei Wang, Can Weng
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Abstract

Annealing, a critical heat treatment process, is known for its effectiveness in reducing residual stresses in parts affected by temperature and pressure fluctuations during injection molding. This study explores the influence of annealing on residual stress distribution inmicrostructured parts made of three materials—polycarbonate (PC), polymethyl methacrylate (PMMA), and polystyrene (PS)—and featuring two depth-to-width ratios of microprismatic structures. This investigation combines molecular dynamics simulation with annealing experiments. Findings demonstrate that annealing significantly reduces residual stresses across all three materials, albeit with varying degrees of effectiveness. This variation in annealing efficacy is linked to the materials’ properties, particularly the presence of a carbonate base in PC, which notably enhances its annealing response. In detail, for PC parts with a 1:1 depth-to-width ratio in micropillar structures, there was a 15.45% reduction in peak residual stress, while parts with a 2:1 ratio experienced a more substantial reduction of 41.56%. The study attributes these differences in annealing outcomes to the depth-to-width ratios of the microstructures, with larger cavity sizes allowing for more effective molecular chain stretching.

Abstract Image

分析退火对注塑成型微结构残余应力的影响
退火是一种关键的热处理工艺,因其能有效减少注塑成型过程中受温度和压力波动影响的零件残余应力而闻名。本研究探讨了退火对由聚碳酸酯(PC)、聚甲基丙烯酸甲酯(PMMA)和聚苯乙烯(PS)三种材料制成的微结构零件中残余应力分布的影响,这些零件具有两种深度与宽度比的微棱镜结构。这项研究结合了分子动力学模拟和退火实验。研究结果表明,退火可显著降低所有三种材料的残余应力,但效果各不相同。这种退火效果的变化与材料的特性有关,特别是 PC 中碳酸盐基的存在,它明显增强了退火反应。具体而言,对于深度与宽度比为 1:1 的微柱结构 PC 部件,峰值残余应力降低了 15.45%,而深度与宽度比为 2:1 的部件则大幅降低了 41.56%。研究将这些退火结果的差异归因于微结构的深宽比,空腔尺寸越大,分子链拉伸越有效。
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来源期刊
CiteScore
4.10
自引率
10.50%
发文量
115
审稿时长
3-6 weeks
期刊介绍: The International Journal of Precision Engineering and Manufacturing accepts original contributions on all aspects of precision engineering and manufacturing. The journal specific focus areas include, but are not limited to: - Precision Machining Processes - Manufacturing Systems - Robotics and Automation - Machine Tools - Design and Materials - Biomechanical Engineering - Nano/Micro Technology - Rapid Prototyping and Manufacturing - Measurements and Control Surveys and reviews will also be planned in consultation with the Editorial Board.
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