Time-dependent Optimal Heating Profile for Thermoforming Preheating
Time-dependent Optimal Heating Profile for Thermoforming Preheating
复制标题
热成型预热的时间相关最佳加热曲线
DOI：
--
复制
发表时间：
2017
影响因子：
--
通讯作者：
Zhen-Zhe Li
中科院分区：
文献类型：
--
作者：
Feng-Xun Li;Zhen-Zhe Li
热成形的主要缺点是难以控制最终产品的厚度。温度分布会影响最终产品的厚度分布，并且发现热量随时间的变化会影响表面和中心之间的温差。本研究的目的是尽量减少ABS板材表面和中心之间的温差。首先，采用近似解析法中的一种积分法，推导出以指数函数形式表示的最优加热剖面。在接下来的步骤中，比较了三阶和四阶函数的误差，以提高模拟精度。最后，在满足热成形要求的条件下，利用所开发的近似解析解进行优化。结果表明，采用该方法可以显著减小ABS板材表面与中心之间的温差。
The key drawback of thermoforming is difficult to control thickness of final products. The temperature distribution affects the thickness distribution of final products, and it was found out that time-dependent variation of heat affects the temperature difference between the surface and the center. The objective of this study is to minimize the temperature difference between the surface and the center of ABS sheet. At first, an optimal heating profile expressed by an exponential function form was derived using integral method which is one of the approximate analytic method. In the following step, the errors for the 3rd and 4th order functions were compared for improving the simulating accuracy. Finally, optimization was carried out using developed approximate analytic solution under the condition of satisfying requirements of thermoforming. The results show that temperature difference between the surface and the center of ABS sheet can be remarkably minimized using developed method.