车灯塑件退火状态下应力松弛规律研究

针对注塑件中普遍存在残余应力这一问题,以材料为聚碳酸酯(PC)的车灯塑件为例,对注塑件在退火工艺下的应力松弛规律进行了研究,对工业玻璃在退火状态下的应力松弛计算公式进行了分析,提出了一种针对聚碳酸酯(PC)材料在退火状态下的应力松弛的数学模型。采取实验的方法,利用钻孔法对3种不同退火状态下得到的车灯塑件的残余应力进行了检测,根据其中测得的两组残余应力数据计算出了应力松弛数学模型中的待定参数,建立起了退火时间、退火温度、退火前残余应力以及退火后残余应力四者之间的关系,并将由该数学模型计算得到的残余应力与第3组测得的残余应力数据进行了对比。研究结果表明,通过由模型和实验得到的结果两者的误差非常小,因此说明该数学模型具有较高的可靠性与准确性。

Stress relaxation law of plastic part of automotive lamp under annealing

Aiming at the problem of injection molding-part was full of residual stress, taking the plastic part of automotive lamp made by Polycarbonate( PC) as an example, the stress relaxation law of plastic part under annealing process was investigated, and the formula of relaxation stress used in industry glass under annealing process was analyzed. A mathematical model of stress relaxation for the material of Polycarbonate( PC) under annealing process was presented. Adopting the experimental as a method, the residual stress of the plastic part of automotive lamp from three different annealing processes were measured by drilling hole method. According to the two sets of data from the experiment, the undetermined parameters in the mathematical model of stress relaxation were calculated, and the relationship between the annealing time, annealing temperature, residual stress before annealing and residual stress after annealing was established. And the residual stress calculated by the mathematical model was compared with the third data from the experiment. The result indicates that the error between these two sets of data is very small and the mathematical model has high accuracy and reliability. [ABSTRACT FROM AUTHOR]