Method of analyzing injection molding conditions

A method for analyzing injection molding conditions using input data which includes:

• mold shape data in which a mold cavity is mathematically defined in response to a shape of a molded resin object,
• resin path shape data in which a resin path joining an injection apparatus and an injection molding machine is mathematically defined,
• cavity surface temperature,
• physical property data of the filling resin, including viscosity, which is temperature dependent, and
• injection data which includes pressure, temperature, and flow amount of the molten resin filling the inside of the mold, the method comprising:
• inputting mold shape data regarding a shape of the mold and a shape of a molded resin product into a computer;
• inputting resin path shape data in which a resin path joining an injection apparatus and an injection molding machine is mathematically defined into the computer;
• inputting injection data including the flow amount to fill the mold, temperature of the resin, physical data of the resin including viscosity, and data relating to a travel speed of an input screw into the computer;
• inputting barrel data including barrel cross-sectional area and length, nozzle diameter and length, sprue diameter and length, and resin compression ratio into the computer;
• calculating flow characteristics including
• volume of molten resin in the barrel in the process of the molten resin filling the inside of the mold,
• the pressure of molten resin in the barrel, and
• the amount of flow at the nozzle, based on the input data;
• and
• calculating the flow characteristics of the molten resin flowing into the mold cavity, while taking into consideration the injection nozzle path shape and a compressibility of the molten resin in the cylinder barrel.