树脂板多点热成形数值模拟与实验研究

介绍了树脂板多点热成形的原理,选择具有良好综合性能的聚甲基丙烯酸甲酯(PMMA)和聚碳酸酯(PC)为研究对象,测试了其玻璃态转变温度。建立了树脂板多点热成形有限元模型,得到了球形面和鞍面件多点热成形的数值模拟结果,结果表明多点热成形技术可以实现PMMA、PC等树脂板三维曲面件的高精度成形。进行了PMMA板球面件和PC板鞍面件多点热成形实验,结果表明实验件的轮廓形状较好、壁厚分布较均匀,验证了树脂板多点热成形技术的可行性和实用性。对树脂板多点热成形实验结果和数值模拟结果进行对比分析,结果表明,在合理的偏差及测量误差范围内,实验结果与数值模拟结果吻合较好,验证了树脂板多点热成形数值模拟的正确性。

Numerical simulation and experiment study of multi-point thermoforming for resin sheet

The principle of multi-point thermoforming ( MPTF) for resin sheet was introduced, and the glass transition temperatures of PMMA and PC sheets were tested for the PMMA and PC with a good comprehensive performance. Then, the finite element model of MPTF for resin sheet was built, and the numerical simulation results of spherical and saddle parts with MPTF were got. The results show that 3D surface of PMMA and PC sheets with good forming quality can be got by MPTF. Furthermore, the multi-point thermoforming experiments of spherical part with PMMA sheet and saddle part with PC sheet were carried out, and the results show that the formed parts are of good outline and uniform thickness, which verifies the feasibility and practicability of MPTF for resin sheet. Comparing the experimental results with numerical results of resin sheets with MPTF, the experimental results coincide with numerical results within a reasonable range of de-viation and measurement error, which verifies the correctness of numerical simulation for resin sheet with MPTF.