Patent ID: 6585919
Filing Date: 2003-07-01
Classification: B29C

Abstract:
A method of injection molding for repeatedly performing an injection molding cycle including the steps of closing and clamping a mold having a mold cavity, injecting a resin material into said mold cavity, cooling and solidifying said resin material filling said mold cavity, and opening said mold so as to remove a molded product, in order to successively form said molded product, said method comprising the steps of:measuring a cycle time at at least one measuring point in said injection molding cycle to thereby obtain a measurement of said cycle time, the at least one measuring point is selected from the group consisting of: the mold closing action initiation point, the mold clamping action initiation point, the mold clamping action completion point, the injection action initiation point, the injection action completion point, the cooling time completion point, and the mold opening operation completion point; obtaining a difference between said measurement of said cycle time and predetermined reference cycle time; and executing a time compensation, at a time-controlled step, for the entire injection molding cycle on the basis of said difference, the time compensation is arranged to be executed before the next measuring point comes.