Method for determining a production parameter of an injection molding, method for producing an injection molding, injection molding device and program

A method for producing an injection molding, comprising the steps of:

• in an event of conducting injection molding using a mold having a plurality of resin inflow conduits to a cavity,
• (1) determining a production parameter by combination of a numerical analysis method for calculating injection molding process and a computer-aided optimization method,
• wherein said production parameter determines time-sequentially an inflow of resin material from said resin inflow conduits into said cavity,
• wherein said production parameter is determined in order to control a mold clamping force required for injection molding,
• wherein said production parameter is a parameter to control the action of valves gates positioned in a plurality of resin inflow conduits, and wherein said production parameter is optimized under a condition that at least one of said valve gates is opened at any spot of time during a filling stage;
• and
• (2) conducting injection molding on the basis of the thus determined production parameter while controlling time-sequentially said inflow of resin material from said resin inflow conduit;
• and
• wherein target areas for controlling weld line occurrence are divided into a plurality of areas, the quantity of weld line occurrence in each area is weighted, the weighted quantity of weld line occurrence is summed to obtain a weld line evaluation value, and the weld line evaluation value thus obtained is used to induce said weld line occurrence to a specified area or to avoid said weld line occurrence from a specified area.

An injection molding device comprising:

• (1) a molding device main body which feeds resin material to a mold having a plurality of resin inflow conduits to a cavity through the resin inflow conduits;
• (2) a memory section which memorizes production parameters determined by combination of a numerical analysis method for calculating injection molding process and a computer-aided optimization methods,
• wherein said production parameter is determined in order to control a mold clamping force required for injection molding,
• wherein said production parameter is a parameter to control the action of valves gates positioned in a plurality of resin inflow conduits, and
• wherein said production parameter is optimized under a condition that at least one of said valve gates is opened at any spot of time during a filling stage;-and
• (3) a control section which carries out injection molding while controlling said molding device main body on the basis of production parameters the thus determined and controlling time-sequentially said inflow of said resin material from said resin inflow conduits;
• and
• wherein target areas for controlling weld line occurrence are divided into a plurality of areas, the quantity of weld line occurrence in each area is weighted, the weighted quantity of weld line occurrence is summed to obtain a weld line evaluation value, and the weld line evaluation value thus obtained is used to induce said weld line occurrence to a specified area or to avoid said weld line occurrence from a specified area.

A computer readable medium having stored thereon instructions for enabling a computer to execute a process for determining production parameters, in the course of carrying out injection molding using a mold having a plurality of resin inflow conduits to a cavity, by combination of a numerical analysis method for calculating injection molding process and a computer-aided optimization method, wherein said production parameters determine time-sequentially the inflow of said resin material from said resin inflow conduits into said cavity,

• wherein said production parameter is determined in order to control a mold clamping force required for injection molding,
• wherein said production parameter is a parameter to control the action of valves gates positioned in a plurality of resin inflow conduits,
• wherein said production parameter is optimized under a condition that at least one of said valve gates is opened at any spot of time during a filling stage;
• and
• wherein target areas for controlling weld line occurrence are divided into a plurality of areas, the quantity of weld line occurrence in each area is weighted, the weighted quantity of weld line occurrence is summed to obtain a weld line evaluation value, and the weld line evaluation value thus obtained is used to induce said weld line occurrence to a specified area or to avoid said weld line occurrence from a specified area.