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Electric injection moulding machine

An injection molding machine, electric technology, applied in the direction of damping device, instrument, control/adjustment system, etc., can solve the problems of slow response, long cycle, unstable vibration, etc.

Inactive Publication Date: 2004-01-28
FANUC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] like Figure 9 As shown, if the speed loop gain is small, the response will slow down when the set pressure a changes, and in terms of the detection of injection pressure b and the detection of actual speed c, there will continue to be long-period vibration protrusions and negative protrusions rather unstable
[0009] On the other hand, if Figure 10 As shown, if the speed loop gain is large, although the response becomes better, but in terms of detecting the injection pressure b and detecting the actual speed c, vibrations with a short period will be generated and unstable

Method used

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Embodiment Construction

[0024] figure 1 It is a block diagram of the drive control system of the servo motor that drives the injection screw in the axial direction to inject the resin in the heating cylinder into the mold in the electric injection molding machine according to the first embodiment of the present invention. figure 1 The driving control system of the present invention is different from the existing control system in terms of setting the pressure filter 10 .

[0025] The servo motor 5 is an injection servo motor that drives the injection screw in the axial direction through a transmission mechanism such as a timing belt and a motion conversion mechanism such as a ball screw / ball nut, and injects the molten resin in the heating cylinder into the mold. A speed detector 6 having an encoder device or the like is installed in the servo motor 5, and the speed detector 6 detects the moving speed of the injection screw by detecting the rotation speed of the servo motor 5 and performs feedback....

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Abstract

An electric servo motor is controlled through a pressure control loop wherein a control object is the injection mechanism of an electric injection molding machine. A band elimination filter, which attenuates a frequency component of a band with predetermined width to be determined based on the resonance frequency of the control object, is provided in the pressure control loop.

Description

technical field [0001] The present invention relates to an electric injection molding machine, especially an electric injection molding machine for pressure control by controlling the speed of a servo motor. These servo motors are used to control the injection pressure, the mold clamping pressure control of the mold clamping mechanism, and the product ejection pressure control of the ejector mechanism, etc. Background technique [0002] In injection molding machines, feedback control is generally used for pressure control such as injection pressure and back pressure. In such pressure control of an injection molding machine, externally generated noise may be superimposed on a detected pressure signal, resulting in unstable pressure control. [0003] Therefore, JP-A-2001-47480 and JP-A-2001-239564 disclose a control method in which such noise is attenuated using a filter to obtain stable control. [0004] On the other hand, in an electric injection molding machine, since the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/76B29C45/77G05B5/01
CPCB29C45/77B29C2045/5032B29C2045/1792B29C45/7653G05B5/01B29C45/7626
Inventor 内山辰宏小宫慎吾长谷元弘
Owner FANUC LTD