Detection method of filling imbalance in a multi-cavity mold for small lens
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- 作者：Jin-Su Gim (1)
Joon-Sung Tae (1)
Joo-Hyeong Jeon (1)
Jae-Hyuk Choi (1)
Byung-Ohk Rhee (1)
1. Department of Mechanical Engineering ; Ajou University ; 206 ; World cup-ro ; Youngtong-gu ; Suwon-si ; Gyeonggi-ro ; 443-479 ; South Korea - 关键词：Filling imbalance ; Injection mold ; Lens ; Multi ; cavity mold
- 刊名：International Journal of Precision Engineering and Manufacturing
- 出版年：2015
- 出版时间：March 2015
- 年：2015
- 卷：16
- 期：3
- 页码：531-535
- 全文大小：1,231 KB
- 参考文献：1. B盲umer, S. (2010) Handbook of Plastic Optics. CrossRef
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- 刊物主题：Industrial and Production Engineering
Materials Science - 出版者：Korean Society for Precision Engineering, in co-publication with Springer Verlag GmbH
- ISSN：2005-4602
文摘
Due to the small product size, multi-cavity molds are used for the phone camera lenses. It is well known that filling imbalance often occurs in multi-cavity molds by shear heating in the runner. However, detecting the filling imbalance is not an easy task in the mold. In this work, we tried to detect filling imbalance by temperature sensors in the runner and indirect pressure sensors at the bottom of lens core. In order to confirm the filling imbalance, short shot tests were carried out at various injection speeds. Temperature and pressure signals were analyzed for a correlation with the short shot test. Temperature signal showed a reliable correlation with respect to the resin-arrival-time (RAT) difference, but pressure signal did not produce a reliable result.