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Control apparatus of injection molding machine with function of adjusting pressure control parameters

An injection molding machine, pressure control technology, applied in the field of adjustment of pressure control parameters, can solve the problems of unstable pressure control system, higher than the appropriate value, slow response of pressure control, etc.

Active Publication Date: 2013-10-23
FANUC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the above-mentioned Japanese Patent Application Laid-Open No. 2011-251301, it is only a static constant such as an elastic constant for identifying an object to be pressurized, and it is difficult to calculate a pressure that optimizes the response speed of pressure for each control frequency band (frequency). parameter problem
Therefore, depending on the control band, the gain value becomes higher than the appropriate value, and the pressure control system becomes unstable, or conversely, the gain value becomes lower than the appropriate value, and the pressure control response becomes sluggish.

Method used

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  • Control apparatus of injection molding machine with function of adjusting pressure control parameters
  • Control apparatus of injection molding machine with function of adjusting pressure control parameters
  • Control apparatus of injection molding machine with function of adjusting pressure control parameters

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Experimental program
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Effect test

Embodiment approach 1

[0042] In the pressure control step, the closed-loop frequency characteristic of the pressure control unit (pressure control loop) is measured, and the pressure control parameters are adjusted so that the measured closed-loop frequency characteristic roughly coincides with the reference closed-loop frequency characteristic. Regarding the above-mentioned reference closed-loop frequency characteristic, the closed-loop frequency characteristic at the time of molding the resin of the standard response is stored in advance, and the value thereof is used as the "reference closed-loop frequency characteristic".

[0043] Among the above-mentioned adjusted pressure control parameters, the proportional gain, integral gain, and differential gain of the pressure control loop, the cut-off frequency of the low-pass filter of the pressure control system, the damping coefficient, and the center frequency of the band-limiting filter of the pressure control system are included. , bandwidth, and ...

Embodiment approach 2

[0047] In the pressure control step, the closed-loop frequency characteristic of the pressure control loop is measured, and the pressure control parameter is adjusted so that a gain margin or a phase margin of the measured closed-loop frequency characteristic coincides with a reference value. The above-mentioned gain margin or phase margin may be set to an appropriate value in advance for each machine, or may be set by an operator according to the characteristics of the molded product. For example, for molded products that require high responsiveness, such as light guide plates, the gain margin or phase margin can be reduced to improve pressure control response, and for molded products that require more stability than responsiveness, such as optical lenses, the gain can be increased Headroom or phase margin to emphasize stability.

Embodiment approach 3

[0049] In the pressure control step, the step response or impulse response of the pressure control loop is measured, and the pressure control parameters are adjusted so that the settling time of the measured step response or impulse response matches the reference value. The above-mentioned reference value of the stabilization time may be set in advance as an appropriate reference value for each machine, or the reference value may be set by an operator according to the characteristics of the molded product. For example, for molded products that require high responsiveness, such as light guide plates, the reference value can be reduced to improve pressure control response, and for molded products that require more stability than responsiveness, such as optical lenses, the reference value can be increased to emphasize stability .

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Abstract

The present invention provides a control apparatus of an injection molding machine with a function of adjusting pressure control parameters. The control apparatus of the injection molding machine has a pressure control part which drives a movable part to perform pressure control according to the pressure control parameters. The control apparatus adjusts the pressure control parameters (pressure control gain, pressure control filter coefficient), so as to enable a closed-loop frequency characteristic measured in a pressure control process to be approximately consistent with a predetermined reference closed-loop frequency characteristic.

Description

technical field [0001] The invention relates to the adjustment of pressure control parameters in a pressure control loop of an injection molding machine. Background technique [0002] In the pressure control of an injection molding machine, it is generally known to advance and retreat a screw in the axial direction, pressurize a resin to be controlled, and control the pressure. At this time, it is known that the responsiveness of the resin pressure when the screw is moved forward and backward varies depending on the type and characteristics of the resin. For example, Japanese Patent Application Laid-Open No. 2011-251301 discloses a technology in which the position of the mechanical load on the object to be pressurized is changed based on the position signal and the pressure signal without performing pressure control by the pressure control unit. The plurality of data are composed to identify the elastic constant of the object to be pressurized, and calculate the pressure co...

Claims

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Application Information

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IPC IPC(8): B29C45/76
CPCB29C45/77B29C2045/5032B29C2945/76036B29C2945/76214B29C2945/76367B29C2945/76381B29C2945/76498B29C2945/76936
Inventor 丸山淳平内山辰宏
Owner FANUC LTD