T자형 단면형상을 가진 성형품의 싱크마크 불량 감소 방안에 대한 연구
A study on the reduction method of sink marks for plastic products with T-shape
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초록
In the automotive industry these days, plastic parts have been developed and replaced with plastic parts by maintaining the same function of existing press parts for a variety of reasons. Injection molding plastic parts are subject to molding defects due to various factors, among which the sink marks usually occur in the areas where bosses and ribs are installed. In this study, we analyzed the influence of various factors on the occurrence of sink marks by using the flow analysis of the forming analysis program(Moldflow analysis) using the rib model with the T-shape. Tests have shown that the greatest influence on the sink mark of cosmetic products is the thickness and pressure of the ribs, and the thickness of the basic moulding thickness of the product increases. However, it was considered that the resin temperature and the mold temperature do not greatly affect the occurrence of the sink mark.
Abstract
In the automotive industry these days, plastic parts have been developed and replaced with plastic parts by maintaining the same function of existing press parts for a variety of reasons. Injection molding plastic parts are subject to molding defects due to various factors, among which the sink marks usually occur in the areas where bosses and ribs are installed. In this study, we analyzed the influence of various factors on the occurrence of sink marks by using the flow analysis of the forming analysis program(Moldflow analysis) using the rib model with the T-shape. Tests have shown that the greatest influence on the sink mark of cosmetic products is the thickness and pressure of the ribs, and the thickness of the basic moulding thickness of the product increases. However, it was considered that the resin temperature and the mold temperature do not greatly affect the occurrence of the sink mark.
참고문헌 (5)
- 임상헌, "사출금형설계", pp.15~16 (2004), 보성각
- Y.S. Suh, "A Study on Sink Mark of Injection Molded Products", Proceedings of the Korean Society of Precision Engineering Conference, pp.811~814 (1997)
- Hyun-Pil Kim, "A Study on Sink Marks in Injection Molding of Boss Parts", Journal of the Korea Society of Die & Mold Engineering, 2(4), pp.37~43 (2008)
- Young-Soo Ro, "A Study on rib sink-marks of injection mold for unpainted parts", Journal of the Korea Society of Die & Mold Engineering, 10(1), pp.7~11 (2016)
- 황순환, "Moldflow Basic Course", pp.147~149 (2014), 청담북스