Apparatus for control of injection molding machine

A control apparatus for an injection molding machine which injects a melted resin within a housing into a cavity of a mold through a nozzle at a housing end by a movement of a screw, comprising:

• nozzle opening changing means for variably driving a throttle path area AN of the nozzle;
• screw changing means for variably driving a moving velocity VS of the screw;
• and
• controlling means for calculating the throttled path area AN such that VS/AN becomes constant corresponding to the velocity VS inputted to the controlling means, and for outputting the value AN thus calculated into the nozzle opening changing means.

A control apparatus for an injection molding machine which injects a melted resin within a housing into a cavity of a mold including a sprue, a runner, and a gate through a nozzle at a housing end by a movement of a screw, comprising:

• nozzle opening changing means for variably driving a throttle path area AN of the nozzle;
• screw velocity changing means for variably driving a moving velocity VS of the screw;
• and
• controlling means for calculating the throttled path are a AN of the nozzle such that (B+AN.sup.-n)VS.sup.n becomes constant, the moving velocity VS being inputted into the controlling means, where B is a total sum of sectional areas of throttled path areas in the sprue, the runner, and the gate, and n is a constant determined by a resin, and for outputting the value AN thus calculated into the nozzle opening changing means.

A control apparatus for an injection molding machine which injects a melted resin within a housing into a cavity of a mold including a sprue, a runner, and a gate through a nozzle at a housing end by a movement of a screw, comprising:

• nozzle opening changing means for variably driving a throttled path area AN of the nozzle;
• screw velocity changing means for variably driving a moving velocity VS of the screw;
• and
• controlling means for calculating the throttled path area AN of the nozzle such that (B-r+AN.sup.-n)VS.sup.n becomes constant, the moving velocity VS being inputted into the controlling means, where B is a total sum of sectional areas of throttled path areas in the sprue, the runner and the gate, r is drop in a resin temperature due to cooling down of the mold temperature, and n is thus calculated into the nozzle opening changing means.

A control apparatus for an injection molding machine which injects a melted resin within a housing into a cavity of a mold through a nozzle at a housing end by a movement of a screw, comprising:

• nozzle opening changing means for variably driving a throttled path area AN of the nozzle;
• screw velocity changing means for variably driving a moving velocity VS of the screw;
• and
• controlling means for calculating the throttled path area AN of the nozzle such that (-r+AN.sup.-n)VS.sup.n becomes constant, the moving r is a drop in a resin temperature due to cooling down of the mold temperature and n is a constant determined by a resin, and for outputting the value AN thus calculated into the nozzle opening changing means.

A control apparatus for an injection molding machine which injects a melted resin within a housing into a cavity of a mold through a nozzle at a housing end by a movement of a screw, comprising:

• nozzle opening changing means for variably driving a throttled path area AN of the nozzle;
• resin temperature detecting means for detecting a resin temperature;
• and
• controlling means for calculating the throttled path area AN such that the detected resin temperature becomes constant, and for outputting the value AN thus calculated into the nozzle opening changing means.

A control apparatus for an injection molding machine which injects resin within a housing into a cavity of a mold through a nozzle at a housing end by a movement of a screw, comprising:

• nozzle opening changing means for variably driving a throttled path area AN of the nozzle;
• differential pressure detecting means for detecting resin pressures at front and back ends of the nozzle, respectively, to obtain a differential pressure of the front and back pressures;
• and
• controlling means for calculating the throttled path area AN such that the selected differential pressure becomes constant, and for outputting the value AN thus calculated into the nozzle opening changing means.

A control apparatus for an injection molding machine which injects a melted resin within a housing into a cavity of a mold through a nozzle at a housing end by a movement of a screw, comprising:

• nozzle opening changing means for variably driving a throttled path area of the nozzle;
• screw velocity changing means for variably driving a moving velocity VS of the screw;
• nozzle opening setting means for setting a target value AN for a nozzle opening inputted into the nozzle opening changing means;
• and
• controlling means for calculating the moving velocity VS of the screw such that VS/AN becomes constant corresponding to the target value AN inputted to the controlling means, and for inputting the value VS thus calculated into the screw opening changing means.