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Injection molding machine

An injection molding and screw technology, which is applied in the field of injection molding machines, can solve problems such as large amount of reverse rotation, insufficient reverse rotation amount not completely closing the check valve, unstable resin filling amount, etc.

Active Publication Date: 2012-04-04
FANUC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, even if the amount of reverse rotation after injection is set as in the above-mentioned prior art, depending on the resin or molding conditions, the amount of reverse rotation may not be enough to completely close the check valve, or the amount of reverse rotation may become too large.
[0005] When the reverse rotation of the screw is insufficient and the check valve is not completely closed, it is not ideal because the filling amount of the resin is unstable.
In addition, when the amount of reverse rotation is too large, more than the required amount of resin is sent to the back of the screw, so the measurement time increases or the problem of resin retention occurs.

Method used

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  • Injection molding machine
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Examples

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Embodiment Construction

[0025] figure 1 It is a block diagram of main parts of an embodiment of the injection molding machine of the present invention.

[0026] The nozzle 1 is attached to the front end of the injection cylinder 2 into which the screw 12 is inserted. A hopper 3 for supplying resin pellets into the injection cylinder 2 is attached to the rear end of the injection cylinder 2 . The screw 12 is rotationally driven by the screw rotation servo motor 9 via the transmission mechanism 11 . Furthermore, the screw 12 is driven in the axial direction by the injection servo motor 5 and the transmission mechanism 4 and ball screw / nut conversion mechanism 7 that converts rotational motion into linear motion to perform injection molding and back pressure control.

[0027] Position / speed detectors 6 and 10 for detecting respective rotational positions and speeds are attached to the servo motor 5 for injection molding and the servo motor 9 for screw rotation. Then, the rotational position and speed...

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Abstract

The present invention provides an injection molding machine. When a screw equipped with a check ring is moved forward, torque acting on the screw is detected, and whether the check ring is closed is determined on the basis of the detected torque. The screw is rotated in reverse when the check ring is determined not to be closed, and the reverse rotation of the screw is stopped when the check ringis determined to be closed. The reverse rotation of the screw is thereby controlled so that the screw is rotated in reverse by an optimal amount for reliably closing the check ring.

Description

technical field [0001] The present invention relates to an injection molding machine, and more particularly, to an injection molding machine that judges the closed state of a check ring of a check valve during advance of a screw, and reversely rotates the screw only by an amount required to close the check valve. Background technique [0002] In an injection molding machine, for example, according to JP-A-62-060621, it is known to close the check valve by rotating the screw in the reverse direction (rotating in the opposite direction to the direction of rotation of the screw in the measurement process) at the same time as injection molding is started. Technology. The amount of reverse rotation of the screw is calculated and set based on the distance between the check valve and the check seat when the check valve is open. [0003] Also, for example, Japanese Patent Laid-Open No. 1-308611 discloses a technique of counter-rotating a screw in synchronization with the injection ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C45/50B29C45/58B29C45/76
Inventor 丸山淳平高次聪
Owner FANUC LTD