Monitoring device for an injection molding machine
A technology for monitoring devices and injection molding machines, which is applied in the field of monitoring devices and can solve problems such as difficulty in testing and storing correspondence
Inactive Publication Date: 2004-09-01
FANUC LTD
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- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
Therefore, the resin must be filled into the heating cylinder without the screw rotating, making it difficult to test and store the correspondence between the heat generated by the heater and the temperature of the heating cylinder detected by the temperature sensor.
Method used
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Embodiment Construction
[0028] figure 1 It is a block diagram showing a principle part of a monitoring device for an injection molding machine according to an embodiment of the present invention. Reference numerals 1, 2 and 3 denote an injection cylinder, a nozzle and a screw of the injection molding machine, respectively. The screw 3 is driven in its axial direction by an injection servo motor M1 through a drive conversion member 10 that converts the rotation of the drive source into linear motion along the injection axis. Furthermore, the screw 3 is rotated by a screw rotation servo motor M2 through a transmission mechanism 11 such as a gear set. The injection servo motor M1 is provided with an encoder P1 which detects the position and movement speed of the screw 3 . The screw rotation servo motor M2 provides a speed detector P2 which detects the rotation speed of the screw 3 .
[0029] The injection cylinder 1 has heaters 5 installed in the respective heating zones, and supply of electric power...
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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.
Description
technical field [0001] The present invention relates to a monitoring device for an injection molding machine, in particular to a monitoring device capable of monitoring heat generated by shearing of resin. Background technique [0002] In the measuring process of an injection molding machine, an injection cylinder is heated by a heater, and the measuring process is performed by retracting the screw while rotating it so that plasticizing, melting, and kneading are located in the Inject the resin in the cylinder. At this time, the resin pellets are plasticized and melted by not only heat generated by the heater but also shear heat generated by shearing the resin pellets by the rotating screw. [0003] However, resins used for optical elements such as lenses are deteriorated due to shearing. Therefore, it is expected that a certain resin can be melted by the heat generated by the heater. [0004] When the resin is sheared, plasticized, and melted by rotating the screw, the s...
Claims
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IPC IPC(8): B29C45/78B29C45/50B29C45/74B29C45/76
CPCB29C45/74B29C2945/76531B29C2945/7619B29C45/7666B29C2945/76668B29C2945/76066B29C2945/76367B29C2945/76033B29C2945/76026
Inventor 内山辰宏松尾明贤
Owner FANUC LTD