Patent ID: 7344664

Claim:
A pressure waveform setting method for injection pressure control of a resin, comprising: adjusting at least one molding condition for injection pressure control of the resin until conforming molded articles are obtained, to generate at least one adjusted molding condition; performing injection pressure control of the resin, based on the at least one adjusted molding condition; detecting a pressure acting on the resin during an injection/dwell stage of the injection pressure control when molded articles are obtained, as a function of time; and setting an injection pressure waveform as a target injection pressure waveform for pressure feedback control in the injection/dwell stage; wherein the at least one molding condition includes an injection pressure switching screw position, an injection speed, a dwell pressure and a dwell time, wherein the injection pressure switching screw position and the injection speed are set for the injection/dwell stage in an injection speed control section of an injection molding machine, and wherein the dwell pressure and dwell time are set in a dwell section of the injection molding machine; wherein said adjusting, performing and detecting are repeated until a conforming molded article is obtained; wherein said setting the injection pressure waveform is performed when the conforming molded article is obtained; and setting the at least one molding condition when the conforming molded article is obtained.