CAJ | 학술논문

基于声发射技术与信号小波包分解，采集成型过程的声发射信号，分析注射成型工艺如注射速度、注射压力、模具温度等对于声发射信号的影响以及有无流动缺陷时声发射信号的区别。实验结果显示，随着注射速度升高或者模具温度的降低，信号能量明显升高。另外注射速度、注射压力和模具温度共同影响信号在375-500kHz频段能谱系数。缺陷检测实验也表明当375-500kHz频段能谱系数大于0.1时，二次透镜表面存在缺陷。注射成型过程的声发射信号尤其是375-500kHz频段信号完全能够反映出工艺参数变化和成型过程熔体流动情况，并且能够实现成型流动缺陷的在线监测。
기우성발사기술여신호소파포분해，채집성형과정적성발사신호，분석주사성형공예여주사속도、주사압력、모구온도등대우성발사신호적영향이급유무류동결함시성발사신호적구별。실험결과현시，수착주사속도승고혹자모구온도적강저，신호능량명현승고。령외주사속도、주사압력화모구온도공동영향신호재375-500kHz빈단능보계수。결함검측실험야표명당375-500kHz빈단능보계수대우0.1시，이차투경표면존재결함。주사성형과정적성발사신호우기시375-500kHz빈단신호완전능구반영출공예삼수변화화성형과정용체류동정황，병차능구실현성형류동결함적재선감측。
The acoustic emission technique is used to capture the acoustic emission signals during injection molding under different process parameters. The signals are processed by using the wavelet packet decomposition to analyze the impacts of injection molding process parameters such as injection speed, injection pressure, mold temperature on the AE signals. The Experimental results show that the signal energy is significantly higher. In addition the injection speed, the injection pressure and the mold temperature effect signal 375-500kHz band spectrum coefficient together which can be used to monitoring the flow of melt. Defect detection experiments also show that when the 375-500kHz band spectrum coefficient is greater than 0.1,some defects occur on the surface of second lens. The acoustic emission signals of injection molding process and process parameters are inseparable, and the AE signals can fully reflect the molding process especially the signal of 375-500kHz band. It is easy to achieve the online monitoring of defects during the flow process based on acoustic emission technology.