中国塑料 ›› 2025, Vol. 39 ›› Issue (2): 45-53.DOI: 10.19491/j.issn.1001-9278.2025.02.009

• 加工与应用 • 上一篇    下一篇

滚塑成型过程传热模型的解析解

温原(), 郭德宇   

  1. 浙江瑞堂塑料科技有限公司,浙江 宁波 315323
  • 收稿日期:2024-05-05 出版日期:2025-02-26 发布日期:2025-02-27
  • 作者简介:温原(1973—),男,高级工程师,从事滚塑材料研究及行业管理,10258@163.com

Analytic solution of heat⁃transfer model in rotomolding process

WEN Yuan(), GUO Deyu   

  1. Zhejiang Rotoun Plastic Technology Corp,Ningbo 315323,China
  • Received:2024-05-05 Online:2025-02-26 Published:2025-02-27

摘要:

建立了电加热滚塑机的传热模型,使用单位时间内的能量守恒定律,建立并求解了炉内空气温度、模具温度、物料温度和模内空气温度的解析解。该解析解在加热段是一个特定的六阶齐次常系数微分方程的一组解,在冷却段是一个特定的三阶齐次常系数微分方程的一组解,这些解均可通过矩阵计算简单求出。通过试验对该解析解进行了验证,结果显示,计算值和实测值有相当高的吻合度。模内空气温度的计算精度为97.51 %,炉内空气温度的计算精度为98.02 %。物料温度的模拟计算结果不支持现有的粉末着模理论。工程上使用模内温度曲线作为质量控制的方法存在一定的局限性。

关键词: 滚塑, 传热模型, 解析解

Abstract:

In this study, a heat transfer model was established for an electric heating rolling machine, and a law of energy conservation per unit time was used to establish and solve analytical solutions for the air temperature inside the furnace, mold temperature, material temperature, and mold air temperature. This analytical solution is a specific set of solutions for a sixth order homogeneous constant coefficient differential equation in the heating section, and a specific set of solutions for a third order homogeneous constant coefficient differential equation in the cooling section. These solutions could be easily obtained through matrix calculation. The analytical solution was validated through experiments, and the results indicated a high degree of agreement between the calculated and measured values. The calculation accuracy of the air temperature inside the mold was 97.51 %, and the calculation accuracy of the air temperature inside the furnace was 98.02 %. The simulation calculation results of material temperature do not support the existing powder deposition theory. The use of in⁃mold temperature curves as a quality control method in engineering has some limitations.

Key words: rotational molding, heat transfer model, analytical solution

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