汽车后灯配光镜是采用聚甲基丙烯酸甲酯(PMMA)材料二次注塑成型.当事先成型好的塑件作为嵌件放入模具中二次注塑后,最终制品内会产生较大的内应力,给使用带来不便.为消除二次注塑成型制品中内应力缺陷,文中通过对2种不同内应力状态的产品进行溶剂浸渍实验研究,得到不同的结果.通过采用远红回火炉对产品回火处理后,塑件内应力可大幅度降低.文中还对塑件应力形成和消除作了阐述.研究表明,合理选择汽车后灯配光镜的回火方法和工艺条件,能保证制品后处理后达到预期效果并满足功能性需要.
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