earticle

영어

Eliminating the moldings bad problem such as weld line, burn, shot short, burr, flow mark, jetting, silver streak, black streak and bubble, and so on caused by interference a mold and a product in designing a mold for in injection molding processes is a very important problem. In general, the moldings bad problem can be avoided by side cores which are the principal members of a mold assembly. The objective of this study is to develop a mold structure with a harmonica core and vacuum system. This mold can decrease the effects of the various deficiencies such as weld line, burn, shot short, burr, flow mark, jetting, silver streak, black streak and bubble, and so on in injection molding. To derive the optimal position and dimensional constraints of the harmonica core and vacuum system, experiment or numerical analysis was performed under normal process conditions.