注塑成型中注射保压切换点的小波检测方法  

Wavelet detection of filling-to-packing switchover point in injection molding

作　　者：李闯[1] 王福利[1,2] 陈娟[1] 董召然[1] 

机构地区：[1]东北大学信息科学与工程学院,辽宁沈阳110004 [2]东北大学流程工业综合自动化教育部重点实验室,辽宁沈阳110004

出　　处：《化工学报》2009年第5期1214-1218,共5页CIESC Journal

基　　金：国家自然科学基金项目(60774068)~~

摘　　要：The detection of filling-to-packing switchover point during injection molding plays a crucial role in ensuring the quality of the molded parts.Traditional detection methods,such as using predetermined screw cushioning or checking injection time have the disadvantages of depending on human experience and failure of adaptation to process parameter variations.This study presents a filling-to-packing detection method using the theory of singularity detection based on wavelet transform modulus maxima,according to the jump feature at filling-to-packing point.It adopted the pressure profile of a previous batch to obtain wavelet decomposition scale and switching threshold etc.,and then used sliding window to conduct on-line detection of switch point.The experimental results indicated that the innovative switchover method yielded a more uniform product mass than any traditional methods.The detection of filling-to-packing switchover point during injection molding plays a crucial role in ensuring the quality of the molded parts. Traditional detection methods, such as using predetermined screw cushioning or checking injection time have the disadvantages of depending on human experience and failure of adaptation to process parameter variations. This study presents a filling-to-packing detection method using the theory of singularity detection based on wavelet transform modulus maxima, according to the jump feature at filling-to-packing point. It adopted the pressure profile of a previous batch to obtain wavelet decomposition scale and switching threshold etc. , and then used sliding window to conduct on-line detection of switch point. The experimental results indicated that the innovative switchover method yielded a more uniform product mass than any traditional methods.

关 键 词：注射保压切换 模腔压力 小波变换 奇异性检测 

分 类 号：TQ320.66[化学工程—合成树脂塑料工业]