METHOD FOR ESTIMATING PLACE WHERE RESIN IS EASILY RELEASED FROM CAVITY SURFACE DURING INJECTION MOLDING, INJECTION MOLD USING IT AND INJECTION MOLDING METHOD

摘要

PPROBLEM TO BE SOLVED: To provide a technique for estimating a place where a resin is released from a cavity surface by calculating an evaluation value showing whether the resin charged in a cavity is easily released from the cavity surface. PSOLUTION: A clocking change in the flow speed, pressure and temperature caused in the resins present in a plurality of divided fine spaces (meshes) formed by dividing the cavity 2a are numerically calculated using a computer, the pressure at the time when the flow of the molten resin is stopped and the integrated value of the pressure from the time of flow stop of the molten resin to the time of solidification of the molten resin are calculated, the evaluation value [surface tension level M(x)] showing the easiness degree of the release from the cavity surface is calculated from the calculated values of both of them and the fine space showing the easy-to-release evaluation value from the cavity surface is specified by comparing the calculated evaluation value with a reference value showing an easy-to-release limit to estimate at the place where the resin is easily released from the cavity surface during injection molding. PCOPYRIGHT: (C)2007,JPO&INPIT