Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting
Patent
1995-11-27
1999-08-24
Ortiz, Angela
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
264266, 2642711, 425120, 425144, 425170, B29C 4514, B29C 4576
Patent
active
059421690
ABSTRACT:
A method of over-molding used to produce a three-dimensional hollow molded article employs a core made of resin having a hollow portion. The core is placed in a cavity of a mold. Molten resin is injected into a space formed by the core and a cavity wall of the mold through a resin injection portion. In this way at least part of the outer surface of the core is covered with resin. Deformation of the core due to the pressure of the resin during injection is prevented in one of a number of different ways. The over-molding method is optimized by calculating a temperature distribution and a pressure distribution of the molten resin in the step of injecting the molten resin into the space by numerical analysis. The displacement distribution and for the stress distribution of the core caused by pressure applied to the core by flow of the molten resin is calculated by a numerical analysis on the basis of the calculated temperature distribution and pressure distribution. The form of the hollow molded article, the form of the core, the form of the mold, and the molding conditions can thereby be optimized on the basis of at least one of the calculated displacement distribution and the stress distribution so as to minimize deformation of the core.
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Kakinoki Osamu
Narazaki Norio
Shiraishi Yutaka
Mitsubishi Engineering-Plastics Corp,
Ortiz Angela
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