Monitoring device for an injection molding machine
First Claim
1. 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 be 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 elapsing time in the metering process; and
display means for displaying the stored rate of heat generation by the heater with the elapsing time in the metering process in a form of a graph.
1 Assignment
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Accused Products
Abstract
A monitoring device for an injection molding machine whereby the state of resin sheared by a rotating screw can be easily monitored. During the period from the start to end of metering process, the rate of heat generated by a heater for heating an injection cylinder is obtained by multiplying an on/off ratio B of the heater by a coefficient K and stored in a memory location THmem(n). Also, a time elapsed from the start of the metering is obtained by adding up a processing period T and stored in a memory location Tim(n). The heat generation rates of the heater stored in memory and corresponding to the respective elapsed times are displayed in graph form. The temperature of the injection cylinder represents heat generated by the heater plus heat generated due to resin shearing. Since the heat generation rate of the heater is detected, the rate of heat generated due to resin shearing can be grasped relatively from the detected heat generation rate, making it possible to monitor the state of the resin sheared by the rotating screw. The resin shearing state can be monitored by simple processing of detecting and displaying the heat generation rate of the heater.
10 Citations
20 Claims
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1. 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 be a set temperature, said monitoring device comprising:
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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; and
display means for displaying the stored rate of heat generation by the heater with the elapsing time in the metering process in a form of a graph. - View Dependent Claims (2, 3)
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4. 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:
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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. - View Dependent Claims (5, 6)
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7. 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:
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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. - View Dependent Claims (8, 9, 10)
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11. 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:
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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. - View Dependent Claims (12, 13, 14)
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15. 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:
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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. - View Dependent Claims (16, 17)
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18. 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:
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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. - View Dependent Claims (19, 20)
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Specification