Monitoring device for an injection molding machine

A monitoring device for an injection molding machine in which a metering process is performed by retraction of a screw by rotating the screw to knead resin in an injection cylinder while controlling temperature of the injection cylinder heated by a heater to coincide with a set temperature, said monitoring device comprising:

• detecting means for detecting a rate of heat generation per unit time by the heater in the metering process;
• storing means for storing the rate of heat generation by the heater with position of the screw in the metering process;
• and
• display means for displaying the stored rate of heat generation by the heater with the position of the screw in the metering process in a form of graph.

A monitoring device for an injection molding machine in which a metering process is performed by retraction of a screw by rotating the screw to knead resin in an injection cylinder while controlling temperature of the injection cylinder heated by a heater to coincide with a set temperature, said monitoring device comprising:

• detecting means for detecting a rate of heat generation per unit time by the heater in the metering process;
• storing means for storing the rate of heat generation of the heater with elapsing time in the metering process;
• setting means for setting an allowable range of the rate of heat generation by the heater in a determination section in the metering process;
• and
• determination means for determining an abnormality of the metering process when the rate of heat generation by the heater deviates from the allowable range in the determination section.

A monitoring device for an injection molding machine in which a metering process is performed by retraction of a screw by rotating the screw to knead resin in an injection cylinder while controlling temperature of the injection cylinder heated by a heater to coincide with a set temperature, said monitoring device comprising:

• detecting means for detecting a rate of heat generation per unit time by the heater in the metering process;
• storing means for storing the rate of heat generation by the heater with position of the screw in the metering process;
• setting means for setting an allowable range for the rate of heat generation by the heater in a determination section of the metering process;
• and
• determining means for determining abnormality of metering if the rate of heat generation by the heater deviates from the allowable range in the determination section.

A monitoring device for an injection molding machine in which a metering process is performed by retraction of a screw by rotating the screw to knead resin in an injection cylinder while controlling temperature of the injection cylinder heated by a heater, said monitoring device comprising:

• detecting means for detecting a rate of heat generation per unit time by the heater in the metering process;
• storing means for storing the rate of heat generation by the heater with elapsing time in the metering process;
• calculation means for calculating an average value of the rate of heat generation by the heater in the metering process;
• and
• setting means for setting an allowable range of the rate of heat generation by the heater;
• determination means for determining an abnormality of metering if the average value of the rate of heat generation by the heater deviates from the allowable range.

A monitoring device for an injection molding machine in which a metering process is performed by retraction of a screw by rotating the screw to knead resin in an injection cylinder while controlling temperature of the injection cylinder heated by a heater, said monitoring device comprising:

• detecting means for detecting a rate of heat generation per unit time by the heater in the metering process;
• storing means for storing the rate of heat generation by the heater with position of the screw in the metering process;
• calculation means for calculating an average value of the rate of heat generation by the heater in the metering process;
• setting means for setting an allowable range of the rate of heat generation of the heater;
• and
• determining means for determining an abnormality of metering if the average value of the rate of heat generation by the heater deviates from the allowable range.