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Control device for injection molding machine with function of reducing synchronous error

A technology for an injection molding machine and a control device, which is applied in the field of the control device of an injection molding machine, can solve problems such as the deterioration of control synchronization, and achieve the effect of reducing synchronization errors and maintaining synchronization.

Active Publication Date: 2018-05-08
FANUC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this technique, there is a problem that when the synchronization of positions among a plurality of servomotors deteriorates, the drive of the servomotors is merely stopped, and it is difficult to control the torque of the servomotors while limiting the torque of the servomotors. Deteriorating the synchronization of the position

Method used

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  • Control device for injection molding machine with function of reducing synchronous error
  • Control device for injection molding machine with function of reducing synchronous error
  • Control device for injection molding machine with function of reducing synchronous error

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Embodiment Construction

[0018] The control device for an injection molding machine according to the present invention is characterized in that, when a driven member is driven by a plurality of servo motors, the drive torque of each motor is limited to a torque limit value or less, and the torque limit is corrected. The value is such that the synchronization between the motors is well maintained.

[0019] First, refer to figure 1 A first embodiment of a control device for an injection molding machine according to the present invention will be described. In this embodiment, the torque limit value of the slave axis is corrected.

[0020] The control device for controlling the motor of the main shaft 60M and the motor of the slave shaft 60S includes first and second position control units 51A and 51B for inputting position commands output from a host control unit (not shown), and first and second speed control units. 53A, 53B, first and second torque limiting units 54A and 54B, first and second current...

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Abstract

In the control device of the injection molding machine of the present invention, one driven member of the injection molding machine is driven with a plurality of shafts by the control device. Mutual synchronization errors of the plurality of axes are detected, and torque limit values ​​for limiting torques of the plurality of axes driving the driven member are corrected so that the detected synchronization errors of the respective axes are reduced.

Description

technical field [0001] The invention relates to a control device for an injection molding machine, in particular to a control device for an injection molding machine with the function of reducing synchronous errors. Background technique [0002] As an injection molding machine, an injection molding machine using a servo motor as a drive mechanism of a shaft is known. In the case of a small injection molding machine, there are many cases where a servo motor is installed for each driven member such as the injection part and the mold closing part to drive, but in the case of a large injection molding machine, a large shaft driving force is required, Therefore, a technique is known in which a plurality of servo motors are provided for one driven member to drive. In this case, as a technique for maintaining positional synchronization between a plurality of servo motors, for example, as described in Japanese Patent Application Laid-Open No. 2002-137269 , a technique is known that...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C45/76
CPCB29C45/76B29C2045/1784B29C2045/1791B29C2945/7602B29C2945/76083B29C2945/76093B29C2945/76214B29C2945/7623B29C2945/76511B29C2945/76568B29C2945/76578B29C2945/76692B29C2945/76709
Inventor 丸山淳平
Owner FANUC LTD